V1.0.46 oss (#253)

* add a UI trigger for demo annotations

* Implement internal link navigation

* Simplify bottom padding logic in `EpubReaderScreen` for vertical scroll mode

* Add support for Calibre metadata

* Implement advanced library management with Room-backed collections, tags, and smart rules.

* Display book series information in book details and remove tags from home screen

* Implement zoom reset functionality in PDF viewer

* Add a "Pages" thumbnail view to the PDF navigation drawer

* Implement jump-back navigation in PDF viewer

* MainViewModel: disable FolderSyncWorker, add log export, and enhance PDF position logging

* Replace Gson with Kotlin Serialization in SmartCollectionEngine

* Implement ONNX-based speech bubble detection

* Implement speech bubble detection in PDF viewer

* Implement "Smart Comic Zoom" feature for PDF manga/comic reading

* Implement reader session persistence and restoration in `MainViewModel`

* Add tap-to-turn page feature to PDF viewer

* Improve book cache management and recovery

* Refactor top overlay padding logic in `PdfViewerScreen`

* Implement stylus eraser support in PDF reader

* Refactor ReaderTextFormatPanel to use ModalBottomSheet and add new formatting controls

* Introduce a customizable horizontal margin setting for the EPUB reader

* Refine folder sync and metadata handling for better conflict resolution and stability.

* Introduce user-adjustable image scaling for the EPUB reader

* Use maxWidthPx as default width fallback for blocks

* Improve cross-page text selection and header styling in the paginated reader

* Refactor speech bubble detection and UI to support segmentation masks and interactive scaling

* Improve speech bubble detection masking and rendering quality

* Update ONNX speech bubble detector to use `.ort` model and optimize inference

* Improve pagination accuracy

* Implement hierarchical folder navigation for the library.

* Refactor library item layout for improved space efficiency

* Add support for browsing and downloading Google Fonts

* Persist library landing state and add shelf search functionality

* Fix base tts sample.

* Move SpeechBubbleDetector to main source set and update ONNX dependency

* Implement a "locate" feature and improve synchronization for TTS (Text-to-Speech) playback across EPUB and PDF readers.

* Refine TTS synchronization and voice management in the EPUB reader

* Adjust OCR checks for OSS flavor and optimize external dictionary intent flags

* Add "Locate" button to PDF drawer's pages tab and move the page number to bottom right of thumbnail

* fix various crashes

* Refactor SpeechBubbleDetector into product flavors

* Implement speech bubble detection caching and background prefetching

* Implement on-demand download for Bubble Zoom ML model

* Add smooth animation for PDF speech bubble expansion

* fixes #252

* hide Google Fonts option, in FontsScreen, for offline variant

* Bump version to 1.0.46(46)

app/build.gradle.kts

@@ -30,8 +30,8 @@ android {
         applicationId = "com.aryan.reader"
         minSdk = 26
         targetSdk = 35
-        versionCode = 45
-        versionName = "1.0.45"
+        versionCode = 46
+        versionName = "1.0.46"
 
         resourceConfigurations += setOf("en", "ar", "de", "tr")
 
@@ -139,6 +139,17 @@ android {
             version = "3.22.1"
         }
     }
+    testOptions {
+        unitTests.isReturnDefaultValues = true
+        unitTests.all {
+            it.jvmArgs("-Xss2m")
+        }
+    }
+    configurations {
+        named("testImplementation") {
+            exclude(group = "org.slf4j", module = "slf4j-android")
+        }
+    }
 }
 //noinspection UseTomlInstead
 dependencies {
@@ -230,12 +241,12 @@ dependencies {
 
     implementation("com.materialkolor:material-kolor:5.0.0-alpha07")
 
-    debugImplementation("org.tensorflow:tensorflow-lite:2.17.0")
-    debugImplementation("org.tensorflow:tensorflow-lite-support:0.5.0")
-    debugImplementation("org.tensorflow:tensorflow-lite-gpu:2.17.0")
-    debugImplementation("org.tensorflow:tensorflow-lite-gpu-api:2.17.0")
-
     implementation("androidx.core:core-splashscreen:1.2.0")
+
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("io.mockk:mockk-android:1.14.9")
+    testImplementation(libs.kotlinx.coroutines.test)
+    testImplementation("org.slf4j:slf4j-nop:2.0.17")
 }
 
 spotless {

app/proguard-rules.pro

@@ -82,4 +82,9 @@
 
 -keep class com.aryan.reader.pdf.NativePdfiumBridge {
     *;
-}
+}
+
+# Preserve ONNX Runtime Java classes
+-keep class ai.onnxruntime.** { *; }
+-keepnames class ai.onnxruntime.** { *; }
+-keepclassmembers class ai.onnxruntime.** { *; }

app/src/main/assets/epub_reader.js

@@ -79,7 +79,7 @@
             }
 
             img, svg, video, canvas {
-                max-width: 100%; width: 100%; height: auto; display: block; margin-left: auto; margin-right: auto; background-color: transparent; object-fit: contain;
+                max-width: 100%; width: auto; height: auto; display: block; margin-left: auto; margin-right: auto; background-color: transparent; object-fit: contain;
             }
 
             figure img {
@@ -481,10 +481,18 @@
         if (anchor) {
             var href = anchor.getAttribute('href');
             var epubType = anchor.getAttribute('epub:type');
+            var linkText = (anchor.textContent || '').trim().substring(0, 80);
+
+            console.log("LINK_NAV: [JS-CLICK] href='" + href + "', epub:type='" + epubType + "', label='" + linkText + "'");
+
+            if (window.LinkNavBridge && window.LinkNavBridge.onLinkClicked) {
+                window.LinkNavBridge.onLinkClicked(href || '', epubType || '', linkText);
+            }
 
             console.log("FootnoteDiag: Link clicked. href: '" + href + "', epub:type: '" + epubType + "'");
 
-            if ((href && href.startsWith('#')) || epubType === 'noteref') {
+           if ((href && href.startsWith('#')) || epubType === 'noteref') {
+               console.log("LINK_NAV: [JS-CLASSIFY] type=FRAGMENT_OR_FOOTNOTE, href='" + href + "'");
                 var targetId = href ? href.substring(1) : null;
                 console.log("FootnoteDiag: Extracted targetId: '" + targetId + "'");
 
@@ -504,10 +512,12 @@
                     }
                 }
             }
+        } else {
+            console.log("LINK_NAV: [JS-NO-ANCHOR] No <a> tag found in click target hierarchy");
         }
     }, true);
 
-    window.updateReaderStyles = function (fontSizeEm, lineHeight, fontFamily, textAlign, paragraphGap) {
+    window.updateReaderStyles = function (fontSizeEm, lineHeight, fontFamily, textAlign, paragraphGap, imageSize, horizontalMargin) {
         var logTag = "ReaderFontDiagnosis";
         console.log(
             logTag +
@@ -517,11 +527,15 @@
                 lineHeight +
                 ", Font: '" +
                 fontFamily +
-                "', Align: '" +
-                textAlign +
-                "', Gap: " +
-                paragraphGap
-        );
+                  "', Align: '" +
+                  textAlign +
+                  "', Gap: " +
+                  paragraphGap +
+                  ", ImageSize: " +
+                  imageSize +
+                  ", HorizontalMargin: " +
+                  horizontalMargin
+          );
 
         var dynamicStyleId = "dynamicReaderStyles";
         var dynamicStyleElement = document.getElementById(dynamicStyleId);
@@ -535,10 +549,14 @@
         var newFontSize = parseFloat(fontSizeEm);
         var newLineHeight = parseFloat(lineHeight);
         var newGap = parseFloat(paragraphGap);
+        var newImageSize = parseFloat(imageSize);
+        var newHorizontalMargin = parseFloat(horizontalMargin);
 
         if (isNaN(newFontSize) || newFontSize < 0.5 || newFontSize > 5.0) newFontSize = 1.0;
         if (isNaN(newLineHeight) || newLineHeight < 1.0 || newLineHeight > 3.0) newLineHeight = 1.0;
         if (isNaN(newGap) || newGap < 0.0 || newGap > 3.0) newGap = 1.0;
+        if (isNaN(newImageSize) || newImageSize < 0.5 || newImageSize > 2.0) newImageSize = 1.0;
+        if (isNaN(newHorizontalMargin) || newHorizontalMargin < 0.0 || newHorizontalMargin > 3.0) newHorizontalMargin = 1.0;
 
         var fontCss = "";
         if (fontFamily && fontFamily !== "Original" && fontFamily !== "") {
@@ -590,7 +608,31 @@
             `;
         }
 
-        dynamicStyleElement.innerHTML = [sizeCss, lineHeightCss, fontCss, alignCss, gapCss].join("\n");
+        var horizontalPaddingPx = Math.max(0, 16 * newHorizontalMargin);
+        var horizontalMarginCss = `
+            body {
+                box-sizing: border-box !important;
+                padding-left: ${horizontalPaddingPx}px !important;
+                padding-right: ${horizontalPaddingPx}px !important;
+            }
+        `;
+
+        var imageCss = `
+            :root {
+                --reader-image-size: ${newImageSize};
+            }
+            body img,
+            body svg,
+            body video,
+            body canvas,
+            body image {
+                width: min(100%, calc(100% * var(--reader-image-size))) !important;
+                max-width: 100% !important;
+                height: auto !important;
+            }
+        `;
+
+        dynamicStyleElement.innerHTML = [sizeCss, lineHeightCss, fontCss, alignCss, gapCss, imageCss, horizontalMarginCss].join("\n");
 
         setTimeout(
             function () {

app/src/main/cpp/pdfium_bridge.cpp

@@ -300,14 +300,18 @@ Java_com_aryan_reader_pdf_NativePdfiumBridge_getPageObjectCount(JNIEnv *env, jcl
 
 extern "C" JNIEXPORT jint JNICALL
 Java_com_aryan_reader_pdf_NativePdfiumBridge_getPageObjectType(JNIEnv *env, jclass clazz, jlong pagePtr, jint index) {
-    if (!init_pdfium() || !get_object_func || !get_object_type_func) return 0;
+    if (!init_pdfium() || !count_objects_func || !get_object_func || !get_object_type_func || pagePtr == 0 || index < 0) return 0;
+    const int object_count = count_objects_func(reinterpret_cast<void*>(pagePtr));
+    if (index >= object_count) return 0;
     void* obj = get_object_func(reinterpret_cast<void*>(pagePtr), index);
     return obj ? get_object_type_func(obj) : 0;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
 Java_com_aryan_reader_pdf_NativePdfiumBridge_getPageObjectBoundingBox(JNIEnv *env, jclass clazz, jlong pagePtr, jint index, jfloatArray outRect) {
-    if (!init_pdfium() || !get_object_func || !get_object_bounds_func) return JNI_FALSE;
+    if (!init_pdfium() || !count_objects_func || !get_object_func || !get_object_bounds_func || pagePtr == 0 || index < 0 || outRect == nullptr) return JNI_FALSE;
+    const int object_count = count_objects_func(reinterpret_cast<void*>(pagePtr));
+    if (index >= object_count) return JNI_FALSE;
     void* obj = get_object_func(reinterpret_cast<void*>(pagePtr), index);
     if (!obj) return JNI_FALSE;
 
@@ -322,7 +326,9 @@ Java_com_aryan_reader_pdf_NativePdfiumBridge_getPageObjectBoundingBox(JNIEnv *en
 
 extern "C" JNIEXPORT jintArray JNICALL
 Java_com_aryan_reader_pdf_NativePdfiumBridge_extractImagePixels(JNIEnv *env, jclass clazz, jlong pagePtr, jint index, jintArray dimens) {
-    if (!init_pdfium() || !get_object_func || !get_image_bitmap_func || !bitmap_get_buffer_func) return nullptr;
+    if (!init_pdfium() || !count_objects_func || !get_object_func || !get_object_type_func || !get_image_bitmap_func || !bitmap_get_buffer_func || pagePtr == 0 || index < 0 || dimens == nullptr) return nullptr;
+    const int object_count = count_objects_func(reinterpret_cast<void*>(pagePtr));
+    if (index >= object_count) return nullptr;
 
     void* obj = get_object_func(reinterpret_cast<void*>(pagePtr), index);
     if (!obj || get_object_type_func(obj) != 3) return nullptr; // 3 = FPDF_PAGEOBJ_IMAGE
@@ -605,4 +611,4 @@ Java_com_aryan_reader_pdf_NativePdfiumBridge_getLinkInfoAtPoint(JNIEnv *env, jcl
 
     LOGI("PdfLinkDiagnostic: Link found but payload was empty or unsupported.");
     return nullptr;
-}
+}

app/src/main/java/com/aryan/reader/AppNavigation.kt

@@ -59,6 +59,16 @@ object AppDestinations {
     const val FONTS_SCREEN_ROUTE = "fonts_screen_route"
 }
 
+private fun NavHostController.navigateSingleTopTo(route: String) {
+    navigate(route) {
+        launchSingleTop = true
+        restoreState = true
+        popUpTo(graph.startDestinationId) {
+            saveState = true
+        }
+    }
+}
+
 @OptIn(ExperimentalMaterial3Api::class)
 @RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
 @Composable
@@ -77,25 +87,21 @@ fun AppNavigation(
                     FileType.PDF, FileType.CBZ, FileType.CBR, FileType.CB7 -> {
                         if (uiState.selectedPdfUri != null) {
                             if (navController.currentDestination?.route != AppDestinations.PDF_VIEWER_ROUTE) {
-                                navController.navigate(AppDestinations.PDF_VIEWER_ROUTE) {
-                                    popUpTo(AppDestinations.MAIN_ROUTE)
-                                }
+                                navController.navigateSingleTopTo(AppDestinations.PDF_VIEWER_ROUTE)
                             }
                         }
                     }
                     FileType.EPUB, FileType.MOBI, FileType.MD, FileType.TXT, FileType.HTML, FileType.FB2, FileType.DOCX, FileType.ODT, FileType.FODT -> {
                         if (uiState.selectedEpubBook != null) {
                             if (navController.currentDestination?.route != AppDestinations.EPUB_READER_ROUTE) {
-                                navController.navigate(AppDestinations.EPUB_READER_ROUTE) {
-                                    popUpTo(AppDestinations.MAIN_ROUTE)
-                                }
+                                navController.navigateSingleTopTo(AppDestinations.EPUB_READER_ROUTE)
                             }
                         }
                     }
                     null -> {
                         val currentRoute = navController.currentBackStackEntry?.destination?.route
                         if (currentRoute != null && currentRoute != AppDestinations.MAIN_ROUTE) {
-                            navController.popBackStack(AppDestinations.MAIN_ROUTE, inclusive = false)
+                            navController.navigateSingleTopTo(AppDestinations.MAIN_ROUTE)
                         }
                     }
                 }
@@ -286,4 +292,4 @@ fun AppNavigation(
             )
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/Common.kt

@@ -185,6 +185,7 @@ import timber.log.Timber
 import java.io.File
 import java.net.HttpURLConnection
 import java.net.URL
+import java.util.Locale
 import kotlin.math.max
 import kotlin.math.min
 import kotlin.math.roundToInt
@@ -1284,6 +1285,21 @@ fun DeviceVoicesTab(
             .clickable(enabled = !isTtsActive && isBaseMode) {
                 savedVoiceName = null
                 saveNativeVoice(context, null)
+                ttsEngine?.apply {
+                    try {
+                        val defaultLocale = Locale.getDefault()
+                        language = defaultLocale
+                        val fallbackVoice =
+                            defaultVoice ?: voices.firstOrNull { voice ->
+                                voice.locale == defaultLocale && !voice.isNetworkConnectionRequired
+                            } ?: voices.firstOrNull { voice ->
+                                voice.locale == defaultLocale
+                            }
+                        fallbackVoice?.let { voice = it }
+                    } catch (e: Exception) {
+                        Timber.tag("TTS_DIAGNOSE").w(e, "Failed to reset preview engine to system default voice")
+                    }
+                }
             }
     ) {
         Row(modifier = Modifier.padding(16.dp), verticalAlignment = Alignment.CenterVertically) {
@@ -1361,7 +1377,7 @@ fun DeviceVoicesTab(
                         enabled = !isTtsActive,
                         onClick = {
                             ttsEngine?.apply {
-                                language = voice.locale
+                                this.voice = voice
                                 speak("This is a voice sample.", TextToSpeech.QUEUE_FLUSH, null, "sample_${voice.name}")
                             }
                         }
@@ -3004,4 +3020,4 @@ fun ManageCacheTab(bookTitle: String, summaryCacheManager: SummaryCacheManager,
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/FolderSyncWorker.kt

@@ -37,7 +37,10 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
 import androidx.core.content.edit
 import com.aryan.reader.data.LocalSyncUtils
+import com.aryan.reader.data.FolderBookMetadata
 import java.io.File
+import android.provider.DocumentsContract
+import java.security.MessageDigest
 
 class FolderSyncWorker(
     private val appContext: Context,
@@ -138,17 +141,17 @@ class FolderSyncWorker(
             LocalSyncUtils.migrateLegacySidecarsToSubfolder(appContext, documentTree)
 
             Timber.tag("FolderSync").d("Phase 1: Importing JSON metadata from folder...")
-            val folderMetadataMap = LocalSyncUtils.getAllFolderMetadata(appContext, folderUri)
+            val folderMetadataMap = LocalSyncUtils.getAllFolderMetadata(appContext, folderUri).toMutableMap()
 
             Timber.tag("FolderSync").d("Phase 1.5: Preloading annotation sidecars...")
-            val preloadedSidecars = LocalSyncUtils.preloadAnnotationSidecars(appContext, documentTree)
+            val preloadedSidecars = LocalSyncUtils.preloadAnnotationSidecars(appContext, documentTree).toMutableMap()
 
             folderMetadataMap.forEach { (bookId, remoteMeta) ->
                 val existingItem = recentFilesRepository.getFileByBookId(bookId)
 
                 if (existingItem != null) {
                     if (remoteMeta.lastModifiedTimestamp > existingItem.lastModifiedTimestamp) {
-                        Timber.tag("FolderSync").d("Applying remote update for $bookId (Progress: ${remoteMeta.progressPercentage}%)")
+                        Timber.tag("PdfPositionDebug").w("FolderSyncWorker applies remote progress for $bookId | Local Page: ${existingItem.lastPage} -> Remote Page: ${remoteMeta.lastPage}")
                         val itemToUpdate = existingItem.copy(
                             lastChapterIndex = remoteMeta.lastChapterIndex,
                             lastPage = remoteMeta.lastPage,
@@ -164,6 +167,8 @@ class FolderSyncWorker(
                             timestamp = if (remoteMeta.isRecent) remoteMeta.lastModifiedTimestamp else existingItem.timestamp
                         )
                         recentFilesRepository.addRecentFile(itemToUpdate)
+                    } else {
+                        Timber.tag("PdfPositionDebug").d("FolderSyncWorker: Local meta is newer/equal for $bookId. Ignoring remote. Local Page: ${existingItem.lastPage}")
                     }
                 }
             }
@@ -202,39 +207,39 @@ class FolderSyncWorker(
                 val contentResolver = appContext.contentResolver
                 val foundBookIds = mutableSetOf<String>()
                 val newOrUpdatedItems = mutableListOf<RecentFileItem>()
-                val existingItemsMap = existingFolderBooks.associateBy { it.bookId }
+                val existingItemsMap = existingFolderBooks.associateBy { it.bookId }.toMutableMap()
 
-                val rootDocId = android.provider.DocumentsContract.getTreeDocumentId(folderUri)
+                val rootDocId = DocumentsContract.getTreeDocumentId(folderUri)
                 val dirQueue = ArrayDeque<String>()
                 dirQueue.add(rootDocId)
 
                 val projection = arrayOf(
-                    android.provider.DocumentsContract.Document.COLUMN_DOCUMENT_ID,
-                    android.provider.DocumentsContract.Document.COLUMN_DISPLAY_NAME,
-                    android.provider.DocumentsContract.Document.COLUMN_MIME_TYPE,
-                    android.provider.DocumentsContract.Document.COLUMN_SIZE,
-                    android.provider.DocumentsContract.Document.COLUMN_LAST_MODIFIED
+                    DocumentsContract.Document.COLUMN_DOCUMENT_ID,
+                    DocumentsContract.Document.COLUMN_DISPLAY_NAME,
+                    DocumentsContract.Document.COLUMN_MIME_TYPE,
+                    DocumentsContract.Document.COLUMN_SIZE,
+                    DocumentsContract.Document.COLUMN_LAST_MODIFIED
                 )
 
                 while (dirQueue.isNotEmpty()) {
                     if (isStopped) break
                     val currentDocId = dirQueue.removeFirst()
-                    val childrenUri = android.provider.DocumentsContract.buildChildDocumentsUriUsingTree(folderUri, currentDocId)
+                    val childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(folderUri, currentDocId)
 
                     try {
                         contentResolver.query(childrenUri, projection, null, null, null)?.use { cursor ->
-                            val idCol = cursor.getColumnIndexOrThrow(android.provider.DocumentsContract.Document.COLUMN_DOCUMENT_ID)
-                            val nameCol = cursor.getColumnIndexOrThrow(android.provider.DocumentsContract.Document.COLUMN_DISPLAY_NAME)
-                            val mimeCol = cursor.getColumnIndexOrThrow(android.provider.DocumentsContract.Document.COLUMN_MIME_TYPE)
-                            val sizeCol = cursor.getColumnIndexOrThrow(android.provider.DocumentsContract.Document.COLUMN_SIZE)
-                            val modCol = cursor.getColumnIndexOrThrow(android.provider.DocumentsContract.Document.COLUMN_LAST_MODIFIED)
+                            val idCol = cursor.getColumnIndexOrThrow(DocumentsContract.Document.COLUMN_DOCUMENT_ID)
+                            val nameCol = cursor.getColumnIndexOrThrow(DocumentsContract.Document.COLUMN_DISPLAY_NAME)
+                            val mimeCol = cursor.getColumnIndexOrThrow(DocumentsContract.Document.COLUMN_MIME_TYPE)
+                            val sizeCol = cursor.getColumnIndexOrThrow(DocumentsContract.Document.COLUMN_SIZE)
+                            val modCol = cursor.getColumnIndexOrThrow(DocumentsContract.Document.COLUMN_LAST_MODIFIED)
 
                             while (cursor.moveToNext() && !isStopped) {
                                 val docId = cursor.getString(idCol)
                                 val name = cursor.getString(nameCol) ?: ""
                                 val mimeType = cursor.getString(mimeCol)
 
-                                if (mimeType == android.provider.DocumentsContract.Document.MIME_TYPE_DIR) {
+                                if (mimeType == DocumentsContract.Document.MIME_TYPE_DIR) {
                                     if (!name.startsWith(".") && name != "EpistemeSyncData") {
                                         dirQueue.add(docId)
                                     }
@@ -244,29 +249,49 @@ class FolderSyncWorker(
 
                                     val type = getFileType(name, mimeType)
                                     if (type != null && type in allowedFileTypes && !name.endsWith(".json") && !name.startsWith(".")) {
-                                        val stableId = "local_$name"
+                                        val stableId = buildStableBookId(name, rootDocId, docId)
                                         foundBookIds.add(stableId)
 
-                                        val docUri = android.provider.DocumentsContract.buildDocumentUriUsingTree(folderUri, docId)
+                                        val docUri = DocumentsContract.buildDocumentUriUsingTree(folderUri, docId)
                                         var existingItem = existingItemsMap[stableId]
 
+                                        if (existingItem != null && existingItem.uriString != docUri.toString()) {
+                                            val collidedItem = existingItem
+                                            val collidedStableId = computeStableIdForStoredItem(collidedItem, rootDocId)
+                                            if (!collidedStableId.isNullOrBlank() && collidedStableId != stableId && collidedStableId != collidedItem.bookId) {
+                                                Timber.tag("FolderSync").i("Resolving folder ID collision for ${collidedItem.displayName}: ${collidedItem.bookId} -> $collidedStableId")
+                                                migrateFolderBookId(
+                                                    folderUriString = folderUriString,
+                                                    oldId = collidedItem.bookId,
+                                                    newId = collidedStableId,
+                                                    folderMetadataMap = folderMetadataMap,
+                                                    preloadedSidecars = preloadedSidecars,
+                                                    existingItemsMap = existingItemsMap
+                                                )
+                                                existingItem = existingItemsMap[stableId]
+                                            }
+                                        }
+
                                         if (existingItem == null) {
-                                            val oldItem = existingItemsMap.values.find { it.bookId.startsWith("local_${name}_") && it.bookId != stableId }
+                                            val oldItem = existingItemsMap.values.find {
+                                                it.bookId != stableId && (
+                                                    it.uriString == docUri.toString() ||
+                                                        it.bookId.startsWith("local_${name}_")
+                                                    )
+                                            }
                                             if (oldItem != null) {
                                                 val oldId = oldItem.bookId
                                                 Timber.tag("FolderSync").i("Migrating book ID for $name from $oldId to $stableId")
 
-                                                recentFilesRepository.migrateBookIdLocally(oldId, stableId)
-                                                existingItem = recentFilesRepository.getFileByBookId(stableId)
-
-                                                try {
-                                                    val syncDir = documentTree.findFile("EpistemeSyncData")
-                                                    if (syncDir != null) {
-                                                        syncDir.findFile(".$oldId.json")?.delete()
-                                                        syncDir.findFile("$oldId.json")?.delete()
-                                                        syncDir.findFile(".$oldId" + "_annotations.json")?.delete()
-                                                    }
-                                                } catch (_: Exception) { Timber.tag("FolderSync").e("Failed to clean up orphaned SAF sidecars.") }
+                                                migrateFolderBookId(
+                                                    folderUriString = folderUriString,
+                                                    oldId = oldId,
+                                                    newId = stableId,
+                                                    folderMetadataMap = folderMetadataMap,
+                                                    preloadedSidecars = preloadedSidecars,
+                                                    existingItemsMap = existingItemsMap
+                                                )
+                                                existingItem = existingItemsMap[stableId]
                                             }
                                         }
 
@@ -410,4 +435,78 @@ class FolderSyncWorker(
             else -> null
         }
     }
-}
+
+    private fun buildStableBookId(name: String, rootDocId: String, docId: String): String {
+        val relativePath = buildRelativePath(rootDocId, docId, name)
+        if (relativePath.equals(name, ignoreCase = true)) {
+            return "local_$name"
+        }
+        return "local_${name}_${shortHash(relativePath.lowercase())}"
+    }
+
+    private fun buildRelativePath(rootDocId: String, docId: String, fallbackName: String): String {
+        val rootPath = rootDocId.substringAfter(':', "")
+        val docPath = docId.substringAfter(':', "")
+        if (docPath.isBlank()) return fallbackName
+        val relative = if (rootPath.isNotBlank() && docPath.startsWith(rootPath)) {
+            docPath.removePrefix(rootPath).trimStart('/')
+        } else {
+            docPath.substringAfterLast('/', fallbackName)
+        }
+        return relative.ifBlank { fallbackName }
+    }
+
+    private fun shortHash(value: String): String {
+        val bytes = MessageDigest.getInstance("SHA-256").digest(value.toByteArray())
+        return bytes.joinToString("") { "%02x".format(it) }.take(12)
+    }
+
+    private fun computeStableIdForStoredItem(item: RecentFileItem, rootDocId: String): String? {
+        val uriString = item.uriString ?: return null
+        return try {
+            val docId = DocumentsContract.getDocumentId(uriString.toUri())
+            buildStableBookId(item.displayName, rootDocId, docId)
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    private suspend fun migrateFolderBookId(
+        folderUriString: String,
+        oldId: String,
+        newId: String,
+        folderMetadataMap: MutableMap<String, FolderBookMetadata>,
+        preloadedSidecars: MutableMap<String, Pair<Long, String>>,
+        existingItemsMap: MutableMap<String, RecentFileItem>
+    ) {
+        if (oldId == newId) return
+
+        recentFilesRepository.migrateBookIdLocally(oldId, newId)
+
+        val oldMetadata = folderMetadataMap.remove(oldId)
+        if (oldMetadata != null && newId !in folderMetadataMap) {
+            val migratedMetadata = oldMetadata.copy(bookId = newId)
+            LocalSyncUtils.saveMetadataToFolder(appContext, folderUriString.toUri(), migratedMetadata)
+            folderMetadataMap[newId] = migratedMetadata
+        }
+
+        val oldSidecar = preloadedSidecars.remove(oldId)
+        if (oldSidecar != null && newId !in preloadedSidecars) {
+            LocalSyncUtils.saveAnnotationSidecar(
+                context = appContext,
+                sourceFolderUri = folderUriString.toUri(),
+                bookId = newId,
+                jsonPayload = oldSidecar.second,
+                timestamp = oldSidecar.first
+            )
+            preloadedSidecars[newId] = oldSidecar
+        }
+
+        LocalSyncUtils.deleteBookSidecars(appContext, folderUriString.toUri(), oldId)
+
+        existingItemsMap.remove(oldId)
+        recentFilesRepository.getFileByBookId(newId)?.let {
+            existingItemsMap[newId] = it
+        }
+    }
+}

app/src/main/java/com/aryan/reader/FontsScreen.kt

@@ -17,9 +17,13 @@
  *
  * mail: epistemereader@gmail.com
  */
+// FontsScreen.kt
+@file:Suppress("KotlinConstantConditions")
+
 package com.aryan.reader
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -34,24 +38,32 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.statusBarsPadding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.CloudDownload
 import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.ExtendedFloatingActionButton
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -59,6 +71,8 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.Font
 import androidx.compose.ui.text.font.FontFamily
@@ -69,6 +83,7 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.aryan.reader.data.CustomFontEntity
 import java.io.File
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun FontsScreen(
     viewModel: MainViewModel,
@@ -76,24 +91,21 @@ fun FontsScreen(
 ) {
     val fonts: List<CustomFontEntity> by viewModel.customFonts.collectAsStateWithLifecycle()
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
+    val context = LocalContext.current
 
     // Dialog state
     var showDeleteDialog by remember { mutableStateOf(false) }
     var fontToDelete by remember { mutableStateOf<CustomFontEntity?>(null) }
+    var showGoogleFontsSheet by remember { mutableStateOf(false) }
 
     val pickFontLauncher = rememberFilePickerLauncher { uris ->
         uris.firstOrNull()?.let { viewModel.importFont(it) }
     }
 
-    // Font mime types filter
     val fontMimeTypes = arrayOf(
-        "font/ttf",
-        "font/otf",
-        "font/woff2",
-        "application/x-font-ttf",
-        "application/x-font-otf",
-        "application/font-woff2",
-        "application/vnd.ms-opentype",
+        "font/ttf", "font/otf", "font/woff2",
+        "application/x-font-ttf", "application/x-font-otf",
+        "application/font-woff2", "application/vnd.ms-opentype",
         "application/x-font-opentype"
     )
 
@@ -111,11 +123,24 @@ fun FontsScreen(
         },
         floatingActionButton = {
             if (fonts.isNotEmpty()) {
-                ExtendedFloatingActionButton(
-                    onClick = { pickFontLauncher.launch(fontMimeTypes) },
-                    icon = { Icon(Icons.Default.Add, contentDescription = null) },
-                    text = { Text(stringResource(R.string.import_font)) }
-                )
+                Column(
+                    horizontalAlignment = Alignment.End,
+                    verticalArrangement = Arrangement.spacedBy(16.dp)
+                ) {
+                    ExtendedFloatingActionButton(
+                        onClick = { showGoogleFontsSheet = true },
+                        icon = { Icon(Icons.Default.CloudDownload, contentDescription = null) },
+                        text = { Text("Google Fonts") },
+                        containerColor = MaterialTheme.colorScheme.secondaryContainer,
+                        contentColor = MaterialTheme.colorScheme.onSecondaryContainer
+                    )
+
+                    ExtendedFloatingActionButton(
+                        onClick = { pickFontLauncher.launch(fontMimeTypes) },
+                        icon = { Icon(Icons.Default.Add, contentDescription = null) },
+                        text = { Text(stringResource(R.string.import_font)) }
+                    )
+                }
             }
         }
     ) { padding ->
@@ -125,7 +150,9 @@ fun FontsScreen(
                     title = stringResource(R.string.no_custom_fonts),
                     message = stringResource(R.string.import_fonts_desc),
                     onSelectFileClick = { pickFontLauncher.launch(fontMimeTypes) },
-                    modifier = Modifier.fillMaxSize()
+                    modifier = Modifier.fillMaxSize(),
+                    secondaryButtonText = "Browse Google Fonts",
+                    onSecondaryClick = { showGoogleFontsSheet = true }
                 )
             } else {
                 LazyColumn(
@@ -155,7 +182,6 @@ fun FontsScreen(
                     }
                 }
             }
-            // Banner messages removed as requested
         }
     }
 
@@ -173,8 +199,172 @@ fun FontsScreen(
             }
         )
     }
+
+    if (showGoogleFontsSheet) {
+        GoogleFontsBottomSheet(
+            onDismiss = { showGoogleFontsSheet = false },
+            existingFonts = fonts,
+            getFullFontList = { viewModel.loadGoogleFontsList(context) },
+            onDownloadFont = { fontName, onComplete ->
+                viewModel.downloadGoogleFont(fontName, onComplete)
+            }
+        )
+    }
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun GoogleFontsBottomSheet(
+    onDismiss: () -> Unit,
+    existingFonts: List<CustomFontEntity>,
+    getFullFontList: () -> List<String>,
+    onDownloadFont: (String, () -> Unit) -> Unit
+) {
+    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    var searchQuery by remember { mutableStateOf("") }
+    var downloadingFontName by remember { mutableStateOf<String?>(null) }
+
+    // Curated presets to show when search is empty
+    val popularPresets = remember {
+        listOf(
+            "Merriweather", "Open Sans", "Playfair Display", "Montserrat", "Oswald", "Raleway", "Nunito",
+            "Poppins", "Ubuntu", "Fira Sans", "Quicksand", "Crimson Text",
+            "Literata", "EB Garamond", "Libre Baskerville", "Inter", "Work Sans"
+        )
+    }
+
+    // Lazy evaluation of the full list only when typing
+    val displayList = remember(searchQuery) {
+        if (searchQuery.isBlank()) {
+            popularPresets
+        } else {
+            val allFonts = getFullFontList()
+            allFonts.filter { it.contains(searchQuery, ignoreCase = true) }.take(50) // Limit to 50 for performance
+        }
+    }
+
+    ModalBottomSheet(
+        onDismissRequest = onDismiss,
+        sheetState = sheetState,
+        containerColor = MaterialTheme.colorScheme.surface
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 16.dp, vertical = 8.dp)
+        ) {
+            Text(
+                text = "Browse Google Fonts",
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.Bold,
+                modifier = Modifier.padding(bottom = 12.dp)
+            )
+
+            OutlinedTextField(
+                value = searchQuery,
+                onValueChange = { searchQuery = it },
+                modifier = Modifier.fillMaxWidth(),
+                placeholder = { Text("Search 1900+ fonts...") },
+                leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
+                singleLine = true,
+                shape = RoundedCornerShape(12.dp)
+            )
+
+            Spacer(modifier = Modifier.height(16.dp))
+
+            LazyColumn(
+                modifier = Modifier.fillMaxWidth(),
+                contentPadding = PaddingValues(bottom = 24.dp),
+                verticalArrangement = Arrangement.spacedBy(10.dp)
+            ) {
+                if (searchQuery.isBlank()) {
+                    item {
+                        Text(
+                            text = "Popular Choices",
+                            style = MaterialTheme.typography.labelMedium,
+                            color = MaterialTheme.colorScheme.primary,
+                            modifier = Modifier.padding(vertical = 4.dp)
+                        )
+                    }
+                } else if (displayList.isEmpty()) {
+                    item {
+                        Text(
+                            text = "No fonts found matching '$searchQuery'",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            modifier = Modifier.padding(16.dp)
+                        )
+                    }
+                }
+
+                items(displayList) { fontName ->
+                    val isDownloaded = remember(existingFonts, fontName) {
+                        existingFonts.any { it.displayName.equals(fontName, ignoreCase = true) }
+                    }
+                    val isDownloading = downloadingFontName == fontName
+
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .clip(RoundedCornerShape(8.dp))
+                            .clickable(enabled = !isDownloaded && !isDownloading) {
+                                downloadingFontName = fontName
+                                onDownloadFont(fontName) {
+                                    if (downloadingFontName == fontName) {
+                                        downloadingFontName = null
+                                    }
+                                }
+                            }
+                            .background(
+                                if (isDownloaded) MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.2f)
+                                else MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f)
+                            )
+                            .padding(horizontal = 16.dp, vertical = 14.dp),
+                        verticalAlignment = Alignment.CenterVertically,
+                        horizontalArrangement = Arrangement.SpaceBetween
+                    ) {
+                        Text(
+                            text = fontName,
+                            style = MaterialTheme.typography.bodyLarge,
+                            fontWeight = if (isDownloaded) FontWeight.Bold else FontWeight.Medium,
+                            color = if (isDownloaded) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurface
+                        )
+
+                        Box(modifier = Modifier.padding(start = 12.dp)) {
+                            when {
+                                isDownloaded -> {
+                                    Icon(
+                                        Icons.Default.Check,
+                                        contentDescription = "Already Downloaded",
+                                        tint = MaterialTheme.colorScheme.primary,
+                                        modifier = Modifier.size(20.dp)
+                                    )
+                                }
+                                isDownloading -> {
+                                    CircularProgressIndicator(
+                                        modifier = Modifier.size(20.dp),
+                                        strokeWidth = 2.dp,
+                                        color = MaterialTheme.colorScheme.primary
+                                    )
+                                }
+                                else -> {
+                                    Icon(
+                                        Icons.Default.CloudDownload,
+                                        contentDescription = "Download",
+                                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                                        modifier = Modifier.size(20.dp)
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+// Existing unchanged components
 @Composable
 fun FontListItem(
     font: CustomFontEntity,

app/src/main/java/com/aryan/reader/HomeScreen.kt

@@ -339,12 +339,17 @@ fun HomeScreen(
                                 },
                                 onAppThemeClick = { showAppThemePanel = true },
                                 onTestPanelDetectionClick = { viewModel.testPanelDetection(context) },
-                                onLanguageClick = { showLanguageDialog = true }
+                                onTestSpeechBubbleDetectionClick = { viewModel.testSpeechBubbleDetection(context) },
+                                onLanguageClick = { showLanguageDialog = true },
+                                onExportLogsClick = { viewModel.exportLogsToFile(context) }
                             )
                         } else {
                             ContextualTopAppBar(
                                 selectedItemCount = selectedContextItems.size,
                                 onNavIconClick = { viewModel.clearContextualAction() },
+                                onTagClick = {
+                                    viewModel.openTagSelection(selectedContextItems.map { it.bookId }.toSet())
+                                },
                                 onInfoClick = {
                                     if (selectedContextItems.size == 1) {
                                         itemForInfoDialog = selectedContextItems.first()
@@ -472,7 +477,8 @@ fun HomeScreen(
                                 },
                                 onUpdateName = { newName ->
                                     viewModel.updateCustomName(item.bookId, newName)
-                                }
+                                },
+                                onOpenTags = { viewModel.openTagSelection(setOf(item.bookId)) }
                             )
                         }
                     }
@@ -988,7 +994,9 @@ fun DefaultTopAppBar(
     onStrictFilterToggleClick: () -> Unit,
     onAppThemeClick: () -> Unit,
     onTestPanelDetectionClick: () -> Unit,
-    onLanguageClick: () -> Unit
+    onTestSpeechBubbleDetectionClick: () -> Unit,
+    onLanguageClick: () -> Unit,
+    onExportLogsClick: () -> Unit
 ) {
     var showOptionsMenu by remember { mutableStateOf(false) }
     var showLimitMenu by remember { mutableStateOf(false) }
@@ -1094,6 +1102,16 @@ fun DefaultTopAppBar(
                         onTestPanelDetectionClick()
                         showOptionsMenu = false
                     })
+
+                    DropdownMenuItem(text = { Text("Test Speech Bubble ML Detection") }, onClick = {
+                        onTestSpeechBubbleDetectionClick()
+                        showOptionsMenu = false
+                    })
+
+                    DropdownMenuItem(text = { Text("Export Logs (Last 5000 lines)") }, onClick = {
+                        onExportLogsClick()
+                        showOptionsMenu = false
+                    })
                 }
 
                 if (BuildConfig.DEBUG && BuildConfig.FLAVOR != "oss") {

app/src/main/java/com/aryan/reader/LibraryScreen.kt

@@ -64,6 +64,8 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.LibraryBooks
+import androidx.compose.material.icons.automirrored.filled.List
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material.icons.filled.Check
@@ -76,6 +78,7 @@ import androidx.compose.material.icons.filled.FolderSpecial
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material.icons.filled.Search
+import androidx.compose.material.icons.filled.Star
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.AssistChip
 import androidx.compose.material3.CircularProgressIndicator
@@ -131,6 +134,7 @@ import androidx.lifecycle.viewmodel.compose.viewModel
 import coil.compose.AsyncImage
 import coil.request.ImageRequest
 import com.aryan.reader.data.RecentFileItem
+import com.aryan.reader.data.TagEntity
 import com.aryan.reader.opds.OpdsAcquisition
 import com.aryan.reader.opds.OpdsCatalog
 import com.aryan.reader.opds.OpdsEntry
@@ -159,7 +163,7 @@ fun LibraryScreen(
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val selectedItems = uiState.contextualActionItems
     val isContextualModeActive = selectedItems.isNotEmpty()
-    val selectedShelves = uiState.contextualActionShelfNames
+    val selectedShelves = uiState.contextualActionShelfIds
     val isShelfContextualModeActive = selectedShelves.isNotEmpty()
     val sortOrder = uiState.sortOrder
     val shelves = uiState.shelves
@@ -278,6 +282,7 @@ fun LibraryScreen(
             selectedShelves = selectedShelves,
             sortOrder = sortOrder,
             libraryFilters = uiState.libraryFilters,
+            allTags = uiState.allTags,
             pinnedLibraryBookIds = uiState.pinnedLibraryBookIds,
             pagerState = pagerState,
             scope = scope,
@@ -289,6 +294,7 @@ fun LibraryScreen(
             onFilterClick = { showFilterSheet = true },
             onClearFilters = { viewModel.updateLibraryFilters(LibraryFilters()) },
             onRemoveFilter = { viewModel.updateLibraryFilters(it) },
+            onTagClick = { viewModel.openTagSelection(selectedItems.map { it.bookId }.toSet()) },
             onPinClick = { viewModel.togglePinForContextualItems(isHome = false) },
             onClearSelection = { viewModel.clearContextualAction() },
             onItemClick = viewModel::onRecentFileClicked,
@@ -358,6 +364,7 @@ fun LibraryScreen(
         if (showFilterSheet) {
             LibraryFilterSheet(
                 filters = uiState.libraryFilters,
+                allTags = uiState.allTags,
                 syncedFolders = uiState.syncedFolders,
                 onApply = { viewModel.updateLibraryFilters(it) },
                 onDismiss = { showFilterSheet = false }
@@ -385,7 +392,8 @@ fun LibraryScreen(
                     },
                     onUpdateName = { newName ->
                         viewModel.updateCustomName(item.bookId, newName)
-                    }
+                    },
+                    onOpenTags = { viewModel.openTagSelection(setOf(item.bookId)) }
                 )
             }
         }
@@ -399,7 +407,7 @@ fun ShelfScreen(
 ) {
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val selectedItems = uiState.contextualActionItems
-    val viewingShelfName = uiState.viewingShelfName
+    val viewingShelfId = uiState.viewingShelfId
     val isAddingBooks = uiState.isAddingBooksToShelf
     val shelves = uiState.shelves
     val sortOrder = uiState.sortOrder
@@ -414,17 +422,20 @@ fun ShelfScreen(
         when {
             selectedItems.isNotEmpty() -> viewModel.clearContextualAction()
             isAddingBooks -> viewModel.dismissAddBooksToShelf()
-            else -> viewModel.unselectShelf()
+            else -> viewModel.navigateBackFromShelf()
         }
     }
 
-    val currentShelf = shelves.find { it.name == viewingShelfName }
+    val currentShelf = shelves.find { it.id == viewingShelfId }
+    val childShelves = remember(shelves, currentShelf) {
+        currentShelf?.childShelfIds?.mapNotNull { childId -> shelves.find { it.id == childId } } ?: emptyList()
+    }
 
     Box(modifier = Modifier.fillMaxSize()) {
-        if (viewingShelfName != null && currentShelf != null) {
+        if (viewingShelfId != null && currentShelf != null) {
             if (isAddingBooks) {
                 AddBooksModeScreen(
-                    shelfName = viewingShelfName,
+                    shelfName = currentShelf.name,
                     availableBooks = uiState.booksAvailableForAdding,
                     selectedBookUris = uiState.booksSelectedForAdding,
                     currentSource = uiState.addBooksSource,
@@ -433,20 +444,23 @@ fun ShelfScreen(
                     onSourceChange = viewModel::setAddBooksSource,
                     onBookClick = { item -> viewModel.toggleBookSelectionForAdding(item.bookId) },
                     onBack = viewModel::dismissAddBooksToShelf,
-                    onAddSelectedBooks = { viewModel.addBooksToShelf(viewingShelfName) },
+                    onAddSelectedBooks = { viewModel.addBooksToShelf(viewingShelfId) },
                     downloadingBookIds = uiState.downloadingBookIds
                 )
             } else {
                 ShelfDetailScreen(
                     shelf = currentShelf,
+                    childShelves = childShelves,
                     selectedItems = selectedItems,
                     sortOrder = sortOrder,
                     onSortOrderChange = viewModel::setSortOrder,
-                    onBack = viewModel::unselectShelf,
+                    onBack = viewModel::navigateBackFromShelf,
                     onAddBooksClick = viewModel::showAddBooksToShelf,
+                    onChildShelfClick = viewModel::onShelfClick,
                     onBookClick = viewModel::onRecentFileClicked,
                     onBookLongClick = viewModel::onRecentItemLongPress,
                     onClearSelection = viewModel::clearContextualAction,
+                    onTagClick = { viewModel.openTagSelection(selectedItems.map { it.bookId }.toSet()) },
                     onInfoClick = {
                         if (selectedItems.size == 1) {
                             itemForInfoDialog = selectedItems.first()
@@ -454,24 +468,27 @@ fun ShelfScreen(
                         }
                     },
                     onDeleteClick = { showRemoveFromShelfDialog = true },
-                    onRenameShelf = { viewModel.showRenameShelfDialog(currentShelf.name) },
-                    onDeleteShelf = { viewModel.showDeleteShelfDialog(currentShelf.name) },
+                    onRenameShelf = { viewModel.showRenameShelfDialog(currentShelf.id) },
+                    onDeleteShelf = { viewModel.showDeleteShelfDialog(currentShelf.id) },
                     downloadingBookIds = uiState.downloadingBookIds
                 )
             }
         }
 
         if (showRenameDialogFor != null) {
-            RenameShelfDialog(
-                initialName = showRenameDialogFor,
-                onConfirm = { newName -> viewModel.renameShelf(showRenameDialogFor, newName) },
-                onDismiss = viewModel::dismissRenameShelfDialog
-            )
+            val shelfToRename = shelves.find { it.id == showRenameDialogFor }
+            if (shelfToRename != null) {
+                RenameShelfDialog(
+                    initialName = shelfToRename.name,
+                    onConfirm = { newName -> viewModel.renameShelf(showRenameDialogFor, newName) },
+                    onDismiss = viewModel::dismissRenameShelfDialog
+                )
+            }
         }
 
         if (showDeleteDialogFor != null) {
             DeleteShelfConfirmationDialog(
-                shelfName = showDeleteDialogFor,
+                shelfName = shelves.find { it.id == showDeleteDialogFor }?.name ?: "",
                 onConfirm = { viewModel.deleteShelf(showDeleteDialogFor) },
                 onDismiss = viewModel::dismissDeleteShelfDialog
             )
@@ -493,13 +510,9 @@ fun ShelfScreen(
             if (showInfoDialog) {
                 FileInfoDialog(
                     item = item,
-                    onDismiss = {
-                        showInfoDialog = false
-                        itemForInfoDialog = null
-                    },
-                    onUpdateName = { newName ->
-                        viewModel.updateCustomName(item.bookId, newName)
-                    }
+                    onDismiss = { showInfoDialog = false; itemForInfoDialog = null },
+                    onUpdateName = { newName -> viewModel.updateCustomName(item.bookId, newName) },
+                    onOpenTags = { viewModel.openTagSelection(setOf(item.bookId)) }
                 )
             }
         }
@@ -519,6 +532,7 @@ fun LibraryScreenContent(
     selectedShelves: Set<String>,
     sortOrder: SortOrder,
     libraryFilters: LibraryFilters,
+    allTags: List<TagEntity>,
     pinnedLibraryBookIds: Set<String>,
     pagerState: PagerState,
     scope: CoroutineScope,
@@ -530,6 +544,7 @@ fun LibraryScreenContent(
     onFilterClick: () -> Unit,
     onClearFilters: () -> Unit,
     onRemoveFilter: (LibraryFilters) -> Unit,
+    onTagClick: () -> Unit,
     onPinClick: () -> Unit,
     onClearSelection: () -> Unit,
     onItemClick: (RecentFileItem) -> Unit,
@@ -590,6 +605,7 @@ fun LibraryScreenContent(
                     ContextualTopAppBar(
                         selectedItemCount = selectedItems.size,
                         onNavIconClick = onClearSelection,
+                        onTagClick = onTagClick,
                         onPinClick = onPinClick,
                         onInfoClick = onInfoClick,
                         onDeleteClick = onDeleteClick,
@@ -734,6 +750,19 @@ fun LibraryScreenContent(
                                     trailingIcon = { Icon(Icons.Default.Close, contentDescription = "Clear", modifier = Modifier.size(16.dp)) }
                                 )
                             }
+                            if (libraryFilters.tagIds.isNotEmpty()) {
+                                val selectedTags = allTags.filter { it.id in libraryFilters.tagIds }
+                                val tagLabel = when {
+                                    selectedTags.isEmpty() -> "${libraryFilters.tagIds.size} tags"
+                                    selectedTags.size <= 2 -> selectedTags.joinToString { it.name }
+                                    else -> "${selectedTags.size} tags"
+                                }
+                                AssistChip(
+                                    onClick = { onRemoveFilter(libraryFilters.copy(tagIds = emptySet())) },
+                                    label = { Text("Tags: $tagLabel") },
+                                    trailingIcon = { Icon(Icons.Default.Close, contentDescription = "Clear", modifier = Modifier.size(16.dp)) }
+                                )
+                            }
                         }
                     }
                 }
@@ -846,16 +875,60 @@ private fun ShelvesScreen(
     onShelfLongClick: (Shelf) -> Unit,
     selectedShelves: Set<String>,
 ) {
+    val tagShelves = remember(shelves) { shelves.filter { it.type == ShelfType.TAG && it.bookCount > 0 } }
+    val visibleShelves = remember(shelves) {
+        shelves.filter { shelf ->
+            when {
+                shelf.type == ShelfType.TAG -> false
+                shelf.type == ShelfType.FOLDER -> shelf.parentShelfId == null
+                else -> true
+            }
+        }
+    }
+
     LazyColumn(
         modifier = Modifier
             .fillMaxSize(),
         contentPadding = PaddingValues(start = 16.dp, end = 16.dp, top = 16.dp, bottom = 88.dp),
         verticalArrangement = Arrangement.spacedBy(12.dp)
     ) {
-        items(shelves, key = { it.name }) { shelf ->
+        if (tagShelves.isNotEmpty() && selectedShelves.isEmpty()) {
+            item {
+                Column(verticalArrangement = Arrangement.spacedBy(10.dp)) {
+                    Text(
+                        text = "Browse by tag",
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.SemiBold
+                    )
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .horizontalScroll(rememberScrollState()),
+                        horizontalArrangement = Arrangement.spacedBy(8.dp)
+                    ) {
+                        tagShelves.forEach { shelf ->
+                            FilterChip(
+                                selected = false,
+                                onClick = { onShelfClick(shelf) },
+                                label = { Text(shelf.name) },
+                                leadingIcon = {
+                                    Icon(
+                                        painter = painterResource(id = R.drawable.tag),
+                                        contentDescription = null,
+                                        modifier = Modifier.size(16.dp)
+                                    )
+                                }
+                            )
+                        }
+                    }
+                }
+            }
+        }
+
+        items(visibleShelves, key = { it.id }) { shelf ->
             ShelfListItem(
                 shelf = shelf,
-                isSelected = shelf.name in selectedShelves,
+                isSelected = shelf.id in selectedShelves,
                 onItemClick = { onShelfClick(shelf) },
                 onItemLongClick = { onShelfLongClick(shelf) }
             )
@@ -904,14 +977,17 @@ private fun CreateShelfDialog(onConfirm: (String) -> Unit, onDismiss: () -> Unit
 @Composable
 private fun ShelfDetailScreen(
     shelf: Shelf,
+    childShelves: List<Shelf>,
     selectedItems: Set<RecentFileItem>,
     sortOrder: SortOrder,
     onSortOrderChange: (SortOrder) -> Unit,
     onBack: () -> Unit,
     onAddBooksClick: () -> Unit,
+    onChildShelfClick: (Shelf) -> Unit,
     onBookClick: (RecentFileItem) -> Unit,
     onBookLongClick: (RecentFileItem) -> Unit,
     onClearSelection: () -> Unit,
+    onTagClick: () -> Unit,
     onInfoClick: () -> Unit,
     onDeleteClick: () -> Unit,
     onRenameShelf: () -> Unit,
@@ -919,8 +995,71 @@ private fun ShelfDetailScreen(
     downloadingBookIds: Set<String>,
 ) {
     val isContextualModeActive = selectedItems.isNotEmpty()
+    val isFolderShelf = shelf.type == ShelfType.FOLDER
     var showSortMenu by remember { mutableStateOf(false) }
     var showMoreMenu by remember { mutableStateOf(false) }
+    var isSearchActive by remember(shelf.id) { mutableStateOf(false) }
+    var searchQuery by remember(shelf.id) { mutableStateOf("") }
+    val searchFocusRequester = remember { FocusRequester() }
+    var searchFieldValue by remember(isSearchActive, shelf.id) {
+        mutableStateOf(TextFieldValue(searchQuery, TextRange(searchQuery.length)))
+    }
+    val normalizedQuery = searchQuery.trim()
+    val filteredChildShelves = remember(childShelves, normalizedQuery) {
+        if (normalizedQuery.isBlank()) {
+            childShelves
+        } else {
+            childShelves.filter { childShelf ->
+                childShelf.name.contains(normalizedQuery, ignoreCase = true) ||
+                    childShelf.books.any { item ->
+                        item.displayName.contains(normalizedQuery, ignoreCase = true) ||
+                            item.title?.contains(normalizedQuery, ignoreCase = true) == true ||
+                            item.author?.contains(normalizedQuery, ignoreCase = true) == true
+                    }
+            }
+        }
+    }
+    val filteredDirectBooks = remember(shelf.directBooks, normalizedQuery) {
+        if (normalizedQuery.isBlank()) {
+            shelf.directBooks
+        } else {
+            shelf.directBooks.filter { item ->
+                item.displayName.contains(normalizedQuery, ignoreCase = true) ||
+                    item.title?.contains(normalizedQuery, ignoreCase = true) == true ||
+                    item.author?.contains(normalizedQuery, ignoreCase = true) == true ||
+                    item.tags.any { tag -> tag.name.contains(normalizedQuery, ignoreCase = true) }
+            }
+        }
+    }
+
+    LaunchedEffect(searchQuery) {
+        if (searchFieldValue.text != searchQuery) {
+            searchFieldValue = searchFieldValue.copy(
+                text = searchQuery,
+                selection = TextRange(searchQuery.length)
+            )
+        }
+    }
+
+    LaunchedEffect(isSearchActive) {
+        if (isSearchActive) {
+            searchFocusRequester.requestFocus()
+        }
+    }
+
+    fun clearShelfSearchQuery() {
+        searchQuery = ""
+        searchFieldValue = TextFieldValue("", TextRange.Zero)
+    }
+
+    fun closeShelfSearch() {
+        isSearchActive = false
+        clearShelfSearchQuery()
+    }
+
+    BackHandler(enabled = isSearchActive) {
+        closeShelfSearch()
+    }
 
     Scaffold(
         modifier = Modifier,
@@ -929,9 +1068,54 @@ private fun ShelfDetailScreen(
                 ContextualTopAppBar(
                     selectedItemCount = selectedItems.size,
                     onNavIconClick = onClearSelection,
+                    onTagClick = onTagClick,
                     onInfoClick = onInfoClick,
                     onDeleteClick = onDeleteClick
                 )
+            } else if (isSearchActive) {
+                Surface(
+                    shadowElevation = 4.dp,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .statusBarsPadding()
+                            .height(64.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        IconButton(onClick = { closeShelfSearch() }) {
+                            Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Close search")
+                        }
+                        OutlinedTextField(
+                            value = searchFieldValue,
+                            onValueChange = {
+                                searchFieldValue = it
+                                searchQuery = it.text
+                            },
+                            placeholder = { Text(stringResource(R.string.search_placeholder)) },
+                            modifier = Modifier
+                                .weight(1f)
+                                .padding(vertical = 4.dp)
+                                .focusRequester(searchFocusRequester),
+                            singleLine = true,
+                            colors = TextFieldDefaults.colors(
+                                focusedContainerColor = Color.Transparent,
+                                unfocusedContainerColor = Color.Transparent,
+                                disabledContainerColor = Color.Transparent,
+                                focusedIndicatorColor = Color.Transparent,
+                                unfocusedIndicatorColor = Color.Transparent,
+                            ),
+                            trailingIcon = {
+                                if (searchQuery.isNotEmpty()) {
+                                    IconButton(onClick = { clearShelfSearchQuery() }) {
+                                        Icon(Icons.Default.Close, contentDescription = "Clear query")
+                                    }
+                                }
+                            }
+                        )
+                    }
+                }
             } else {
                 CustomTopAppBar(
                     title = {
@@ -942,7 +1126,14 @@ private fun ShelfDetailScreen(
                                 overflow = TextOverflow.Ellipsis
                             )
                             Text(
-                                text = getBookCountString(shelf.bookCount),
+                                text = when {
+                                    isFolderShelf && shelf.childShelfCount > 0 && shelf.directBookCount > 0 ->
+                                        "${shelf.childShelfCount} folders • ${getBookCountString(shelf.directBookCount)}"
+                                    isFolderShelf && shelf.childShelfCount > 0 ->
+                                        "${shelf.childShelfCount} folders"
+                                    isFolderShelf -> getBookCountString(shelf.directBookCount)
+                                    else -> getBookCountString(shelf.bookCount)
+                                },
                                 style = MaterialTheme.typography.bodyMedium,
                                 color = MaterialTheme.colorScheme.onSurfaceVariant
                             )
@@ -988,7 +1179,14 @@ private fun ShelfDetailScreen(
                             }
                         }
 
-                        if (shelf.name != "Unshelved") {
+                        IconButton(onClick = { isSearchActive = true }) {
+                            Icon(
+                                imageVector = Icons.Default.Search,
+                                contentDescription = "Search shelf"
+                            )
+                        }
+
+                        if (shelf.type == ShelfType.MANUAL && shelf.id != "unshelved") {
                             Box {
                                 IconButton(onClick = { showMoreMenu = true }) {
                                     Icon(
@@ -1022,40 +1220,81 @@ private fun ShelfDetailScreen(
             }
         },
         floatingActionButton = {
-            if (shelf.name != "Unshelved" && !isContextualModeActive) {
+            if (shelf.type == ShelfType.MANUAL && shelf.id != "unshelved" && !isContextualModeActive) {
                 ExtendedFloatingActionButton(
                     onClick = onAddBooksClick,
                     icon = { Icon(Icons.Default.Add, contentDescription = null) },
                     text = { Text(stringResource(R.string.fab_add_books)) }
                 )
             }
-        }
-    ) { paddingValues ->
-        if (shelf.books.isEmpty()) {
-            Box(
-                modifier = Modifier.fillMaxSize().padding(paddingValues),
-                contentAlignment = Alignment.Center
-            ) {
-                Text(stringResource(R.string.shelf_empty), style = MaterialTheme.typography.bodyLarge)
-            }
-        } else {
-            LazyColumn(
-                modifier = Modifier.fillMaxSize().padding(paddingValues),
-                contentPadding = PaddingValues(16.dp),
-                verticalArrangement = Arrangement.spacedBy(12.dp)
-            ) {
-                items(shelf.books, key = { it.bookId }) { item ->
-                    LibraryListItem(
-                        item = item,
-                        isSelected = selectedItems.any { it.bookId == item.bookId },
-                        onItemClick = { onBookClick(item) },
-                        onItemLongClick = { onBookLongClick(item) },
-                        isDownloading = item.bookId in downloadingBookIds
+        },
+        content = { paddingValues ->
+            if (filteredChildShelves.isEmpty() && filteredDirectBooks.isEmpty()) {
+                Box(
+                    modifier = Modifier.fillMaxSize().padding(paddingValues),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Text(
+                        text = if (normalizedQuery.isBlank()) stringResource(R.string.shelf_empty) else stringResource(
+                            R.string.no_results_found,
+                            normalizedQuery
+                        ),
+                        style = MaterialTheme.typography.bodyLarge
                     )
                 }
+            } else {
+                LazyColumn(
+                    modifier = Modifier.fillMaxSize().padding(paddingValues),
+                    contentPadding = PaddingValues(16.dp),
+                    verticalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    if (filteredChildShelves.isNotEmpty()) {
+                        if (isFolderShelf) {
+                            item {
+                                Text(
+                                    text = "Folders",
+                                    style = MaterialTheme.typography.titleSmall,
+                                    fontWeight = FontWeight.SemiBold,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                            }
+                        }
+                        items(filteredChildShelves, key = { it.id }) { childShelf ->
+                            ShelfListItem(
+                                shelf = childShelf,
+                                isSelected = false,
+                                onItemClick = { onChildShelfClick(childShelf) },
+                                onItemLongClick = {},
+                                showHierarchyIndent = false
+                            )
+                        }
+                    }
+                    if (filteredDirectBooks.isNotEmpty() && isFolderShelf && filteredChildShelves.isNotEmpty()) {
+                        item {
+                            Spacer(modifier = Modifier.height(4.dp))
+                        }
+                        item {
+                            Text(
+                                text = "Files",
+                                style = MaterialTheme.typography.titleSmall,
+                                fontWeight = FontWeight.SemiBold,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
+                    items(filteredDirectBooks, key = { it.bookId }) { item ->
+                        LibraryListItem(
+                            item = item,
+                            isSelected = selectedItems.any { it.bookId == item.bookId },
+                            onItemClick = { onBookClick(item) },
+                            onItemLongClick = { onBookLongClick(item) },
+                            isDownloading = item.bookId in downloadingBookIds
+                        )
+                    }
+                }
             }
         }
-    }
+    )
 }
 
 @Composable
@@ -1073,76 +1312,67 @@ private fun AddBooksModeScreen(
     downloadingBookIds: Set<String>,
 ) {
     var showSortMenu by remember { mutableStateOf(false) }
-    var showSourceMenu by remember { mutableStateOf(false) }
 
     Scaffold(
         modifier = Modifier,
         topBar = {
-            CustomTopAppBar(
-                title = { Text(stringResource(R.string.add_to_shelf, shelfName)) },
-                navigationIcon = {
-                    IconButton(onClick = onBack) {
-                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
-                    }
-                },
-                actions = {
-                    Box {
-                        TextButton(onClick = { showSortMenu = true }) {
-                            Icon(
-                                painter = painterResource(id = R.drawable.sort),
-                                contentDescription = "Sort",
-                                modifier = Modifier.size(20.dp)
-                            )
-                            Spacer(modifier = Modifier.width(8.dp))
-                            Text(sortOrder.displayName)
+            Column {
+                CustomTopAppBar(
+                    title = { Text(stringResource(R.string.add_to_shelf, shelfName)) },
+                    navigationIcon = {
+                        IconButton(onClick = onBack) {
+                            Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
                         }
-                        DropdownMenu(
-                            expanded = showSortMenu,
-                            onDismissRequest = { showSortMenu = false }
-                        ) {
-                            SortOrder.entries.forEach { order ->
-                                DropdownMenuItem(
-                                    text = { Text(order.displayName) },
-                                    onClick = {
-                                        onSortOrderChange(order)
-                                        showSortMenu = false
-                                    },
-                                    trailingIcon = {
-                                        if (order == sortOrder) {
-                                            Icon(Icons.Default.Check, contentDescription = "Selected")
-                                        }
-                                    }
+                    },
+                    actions = {
+                        Box {
+                            TextButton(onClick = { showSortMenu = true }) {
+                                Icon(
+                                    painter = painterResource(id = R.drawable.sort),
+                                    contentDescription = "Sort",
+                                    modifier = Modifier.size(20.dp)
                                 )
+                                Spacer(modifier = Modifier.width(8.dp))
+                                Text(sortOrder.displayName)
+                            }
+                            DropdownMenu(
+                                expanded = showSortMenu,
+                                onDismissRequest = { showSortMenu = false }
+                            ) {
+                                SortOrder.entries.forEach { order ->
+                                    DropdownMenuItem(
+                                        text = { Text(order.displayName) },
+                                        onClick = {
+                                            onSortOrderChange(order)
+                                            showSortMenu = false
+                                        },
+                                        trailingIcon = {
+                                            if (order == sortOrder) {
+                                                Icon(Icons.Default.Check, contentDescription = "Selected")
+                                            }
+                                        }
+                                    )
+                                }
                             }
                         }
                     }
-
-                    Box {
-                        IconButton(onClick = { showSourceMenu = true }) {
-                            Icon(Icons.Default.MoreVert, contentDescription = "More options")
-                        }
-                        DropdownMenu(
-                            expanded = showSourceMenu,
-                            onDismissRequest = { showSourceMenu = false }
-                        ) {
-                            AddBooksSource.entries.forEach { source ->
-                                DropdownMenuItem(
-                                    text = { Text(source.displayName) },
-                                    onClick = {
-                                        onSourceChange(source)
-                                        showSourceMenu = false
-                                    },
-                                    trailingIcon = {
-                                        if (source == currentSource) {
-                                            Icon(Icons.Default.Check, contentDescription = "Selected")
-                                        }
-                                    }
-                                )
-                            }
-                        }
+                )
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 12.dp)
+                        .horizontalScroll(rememberScrollState()),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp)
+                ) {
+                    AddBooksSource.entries.forEach { source ->
+                        FilterChip(
+                            selected = source == currentSource,
+                            onClick = { onSourceChange(source) },
+                            label = { Text(source.displayName) }
+                        )
                     }
                 }
-            )
+            }
         },
         floatingActionButton = {
             if (selectedBookUris.isNotEmpty()) {
@@ -1152,37 +1382,42 @@ private fun AddBooksModeScreen(
                     onClick = onAddSelectedBooks
                 )
             }
-        }
-    ) { paddingValues ->
-        if (availableBooks.isEmpty()) {
-            Box(
-                modifier = Modifier.fillMaxSize().padding(paddingValues),
-                contentAlignment = Alignment.Center
-            ) {
-                Text(
-                    text = if (currentSource == AddBooksSource.UNSHELVED) stringResource(R.string.no_unshelved_books) else stringResource(R.string.all_books_in_shelf),
-                    style = MaterialTheme.typography.bodyLarge
-                )
-            }
-        } else {
-            LazyColumn(
-                modifier = Modifier.fillMaxSize().padding(paddingValues),
-                contentPadding = PaddingValues(start = 16.dp, end = 16.dp, top = 16.dp, bottom = 88.dp),
-                verticalArrangement = Arrangement.spacedBy(12.dp)
-            ) {
-                items(availableBooks, key = { it.bookId }) { item ->
-                    val isSelected = item.bookId in selectedBookUris
-                    LibraryListItem(
-                        item = item,
-                        isSelected = isSelected,
-                        onItemClick = { onBookClick(item) },
-                        onItemLongClick = { onBookClick(item) },
-                        isDownloading = item.bookId in downloadingBookIds
+        },
+        content = { paddingValues ->
+            if (availableBooks.isEmpty()) {
+                Box(
+                    modifier = Modifier.fillMaxSize().padding(paddingValues),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Text(
+                        text = if (currentSource == AddBooksSource.UNSHELVED) {
+                            stringResource(R.string.no_unshelved_books)
+                        } else {
+                            stringResource(R.string.all_books_in_shelf)
+                        },
+                        style = MaterialTheme.typography.bodyLarge
                     )
                 }
+            } else {
+                LazyColumn(
+                    modifier = Modifier.fillMaxSize().padding(paddingValues),
+                    contentPadding = PaddingValues(start = 16.dp, end = 16.dp, top = 16.dp, bottom = 88.dp),
+                    verticalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    items(availableBooks, key = { it.bookId }) { item ->
+                        val isSelected = item.bookId in selectedBookUris
+                        LibraryListItem(
+                            item = item,
+                            isSelected = isSelected,
+                            onItemClick = { onBookClick(item) },
+                            onItemLongClick = { onBookClick(item) },
+                            isDownloading = item.bookId in downloadingBookIds
+                        )
+                    }
+                }
             }
         }
-    }
+    )
 }
 
 @Composable
@@ -1260,7 +1495,10 @@ private fun ShelfListItem(
     isSelected: Boolean,
     onItemClick: () -> Unit,
     onItemLongClick: () -> Unit,
+    showHierarchyIndent: Boolean = true,
 ) {
+    val folderIndent = if (showHierarchyIndent && shelf.type == ShelfType.FOLDER) (shelf.depth * 14).dp else 0.dp
+
     androidx.compose.material3.ElevatedCard(
         shape = MaterialTheme.shapes.large,
         colors = androidx.compose.material3.CardDefaults.elevatedCardColors(
@@ -1286,7 +1524,7 @@ private fun ShelfListItem(
             )
     ) {
         Row(
-            modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+            modifier = Modifier.padding(start = 12.dp + folderIndent, end = 12.dp, top = 8.dp, bottom = 8.dp),
             verticalAlignment = Alignment.CenterVertically
         ) {
             ShelfCover(shelf = shelf)
@@ -1294,13 +1532,29 @@ private fun ShelfListItem(
             Spacer(modifier = Modifier.width(16.dp))
 
             Column(modifier = Modifier.weight(1f)) {
-                Text(
-                    text = shelf.name,
-                    style = MaterialTheme.typography.titleMedium,
-                    fontWeight = FontWeight.Bold,
-                    maxLines = 2,
-                    overflow = TextOverflow.Ellipsis
-                )
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    val icon = when (shelf.type) {
+                        ShelfType.SMART -> Icons.Default.Star
+                        ShelfType.TAG -> Icons.AutoMirrored.Filled.LibraryBooks
+                        ShelfType.FOLDER -> Icons.Default.Folder
+                        ShelfType.SERIES -> Icons.AutoMirrored.Filled.LibraryBooks
+                        ShelfType.MANUAL -> Icons.AutoMirrored.Filled.List
+                    }
+                    Icon(
+                        imageVector = icon,
+                        contentDescription = null,
+                        modifier = Modifier.size(16.dp),
+                        tint = MaterialTheme.colorScheme.primary
+                    )
+                    Spacer(modifier = Modifier.width(6.dp))
+                    Text(
+                        text = shelf.name,
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.Bold,
+                        maxLines = 2,
+                        overflow = TextOverflow.Ellipsis
+                    )
+                }
                 Spacer(modifier = Modifier.height(4.dp))
                 Text(
                     text = getBookCountString(shelf.bookCount),
@@ -1378,7 +1632,6 @@ private fun LibraryListItem(
                     contentScale = ContentScale.Crop,
                     modifier = Modifier.fillMaxSize()
                 )
-
                 if (isSelected) {
                     Box(
                         modifier = Modifier.matchParentSize().background(MaterialTheme.colorScheme.primary.copy(alpha = 0.2f)),
@@ -1432,57 +1685,60 @@ private fun LibraryListItem(
                 Row(
                     modifier = Modifier.fillMaxWidth(),
                     verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = Arrangement.spacedBy(10.dp)
+                    horizontalArrangement = Arrangement.spacedBy(8.dp)
                 ) {
                     FileTypeBadge(type = item.type, overlay = false)
 
-                    Box(
-                        modifier = Modifier
-                            .weight(1f)
-                            .height(28.dp),
-                        contentAlignment = Alignment.CenterStart
-                    ) {
-                        if (!item.isAvailable) {
-                            Surface(
-                                shape = RoundedCornerShape(50),
-                                color = if (isDownloading) {
-                                    MaterialTheme.colorScheme.primaryContainer
-                                } else {
-                                    MaterialTheme.colorScheme.errorContainer
-                                },
-                                contentColor = if (isDownloading) {
-                                    MaterialTheme.colorScheme.onPrimaryContainer
-                                } else {
-                                    MaterialTheme.colorScheme.onErrorContainer
-                                }
+                    if (item.tags.isNotEmpty()) {
+                        BookTagChipsRow(
+                            tags = item.tags,
+                            compact = true,
+                            modifier = Modifier.weight(1f, fill = false)
+                        )
+                    } else {
+                        Spacer(modifier = Modifier.weight(1f))
+                    }
+
+                    if (!item.isAvailable) {
+                        Surface(
+                            shape = RoundedCornerShape(50),
+                            color = if (isDownloading) {
+                                MaterialTheme.colorScheme.primaryContainer
+                            } else {
+                                MaterialTheme.colorScheme.errorContainer
+                            },
+                            contentColor = if (isDownloading) {
+                                MaterialTheme.colorScheme.onPrimaryContainer
+                            } else {
+                                MaterialTheme.colorScheme.onErrorContainer
+                            }
+                        ) {
+                            Row(
+                                modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp),
+                                verticalAlignment = Alignment.CenterVertically,
+                                horizontalArrangement = Arrangement.spacedBy(6.dp)
                             ) {
-                                Row(
-                                    modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp),
-                                    verticalAlignment = Alignment.CenterVertically,
-                                    horizontalArrangement = Arrangement.spacedBy(6.dp)
-                                ) {
-                                    if (isDownloading) {
-                                        CircularProgressIndicator(
-                                            modifier = Modifier.size(14.dp),
-                                            strokeWidth = 2.dp
-                                        )
-                                    } else {
-                                        Icon(
-                                            Icons.Filled.Info,
-                                            contentDescription = stringResource(R.string.not_available_locally),
-                                            modifier = Modifier.size(14.dp)
-                                        )
-                                    }
-                                    Text(
-                                        text = if (isDownloading) {
-                                            stringResource(R.string.status_downloading)
-                                        } else {
-                                            stringResource(R.string.not_available_locally)
-                                        },
-                                        style = MaterialTheme.typography.labelSmall,
-                                        fontWeight = FontWeight.Medium
+                                if (isDownloading) {
+                                    CircularProgressIndicator(
+                                        modifier = Modifier.size(14.dp),
+                                        strokeWidth = 2.dp
+                                    )
+                                } else {
+                                    Icon(
+                                        Icons.Filled.Info,
+                                        contentDescription = stringResource(R.string.not_available_locally),
+                                        modifier = Modifier.size(14.dp)
                                     )
                                 }
+                                Text(
+                                    text = if (isDownloading) {
+                                        stringResource(R.string.status_downloading)
+                                    } else {
+                                        stringResource(R.string.not_available_locally)
+                                    },
+                                    style = MaterialTheme.typography.labelSmall,
+                                    fontWeight = FontWeight.Medium
+                                )
                             }
                         }
                     }
@@ -1558,7 +1814,7 @@ private fun DeleteShelfConfirmationDialog(
     AlertDialog(
         onDismissRequest = onDismiss,
         title = { Text(stringResource(R.string.dialog_delete_shelf)) },
-        text = { Text(stringResource(R.string.dialog_delete_shelf_desc)) },
+        text = { Text(stringResource(R.string.dialog_delete_shelf_desc, shelfName)) },
         confirmButton = {
             TextButton(onClick = onConfirm) { Text(stringResource(R.string.action_delete)) }
         },
@@ -1912,6 +2168,7 @@ private fun EditFolderFiltersDialog(
 @Composable
 fun LibraryFilterSheet(
     filters: LibraryFilters,
+    allTags: List<TagEntity>,
     syncedFolders: List<SyncedFolder>,
     onApply: (LibraryFilters) -> Unit,
     onDismiss: () -> Unit
@@ -1987,6 +2244,41 @@ fun LibraryFilterSheet(
                 }
             }
 
+            if (allTags.isNotEmpty()) {
+                Text("Tags", style = MaterialTheme.typography.titleMedium)
+                FlowRow(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                    verticalArrangement = Arrangement.spacedBy(8.dp)
+                ) {
+                    allTags.forEach { tag ->
+                        val selected = tag.id in currentFilters.tagIds
+                        FilterChip(
+                            selected = selected,
+                            onClick = {
+                                val newSet = if (selected) {
+                                    currentFilters.tagIds - tag.id
+                                } else {
+                                    currentFilters.tagIds + tag.id
+                                }
+                                currentFilters = currentFilters.copy(tagIds = newSet)
+                            },
+                            label = { Text(tag.name) },
+                            leadingIcon = {
+                                Box(
+                                    modifier = Modifier
+                                        .size(10.dp)
+                                        .background(
+                                            Color(tag.color ?: 0xFF64B5F6.toInt()),
+                                            CircleShape
+                                        )
+                                )
+                            }
+                        )
+                    }
+                }
+            }
+
             Row(modifier = Modifier.fillMaxWidth().padding(top = 16.dp), horizontalArrangement = Arrangement.End) {
                 TextButton(onClick = { currentFilters = LibraryFilters() }) {
                     Text(stringResource(R.string.clear_all))

app/src/main/java/com/aryan/reader/MainScreen.kt

@@ -69,60 +69,77 @@ fun MainScreen(
     }
 
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
-    val viewingShelfName = uiState.viewingShelfName
+    val viewingShelfName = uiState.viewingShelfId
 
-    if (viewingShelfName != null) {
-        ShelfScreen(viewModel = viewModel)
-    } else {
-        val pagerState = rememberPagerState(
-            initialPage = uiState.mainScreenStartPage,
-            pageCount = { bottomBarItems.size }
-        )
-        val scope = rememberCoroutineScope()
+    androidx.compose.foundation.layout.Box(modifier = Modifier.fillMaxSize()) {
+        if (viewingShelfName != null) {
+            ShelfScreen(viewModel = viewModel)
+        } else {
+            val pagerState = rememberPagerState(
+                initialPage = uiState.mainScreenStartPage,
+                pageCount = { bottomBarItems.size }
+            )
+            val scope = rememberCoroutineScope()
 
-        LaunchedEffect(uiState.mainScreenStartPage) {
-            if (pagerState.currentPage != uiState.mainScreenStartPage) {
-                pagerState.animateScrollToPage(uiState.mainScreenStartPage)
+            LaunchedEffect(uiState.mainScreenStartPage) {
+                if (pagerState.currentPage != uiState.mainScreenStartPage) {
+                    pagerState.animateScrollToPage(uiState.mainScreenStartPage)
+                }
             }
-        }
 
-        LaunchedEffect(pagerState.currentPage) {
-            viewModel.setMainScreenPage(pagerState.currentPage)
-        }
+            LaunchedEffect(pagerState.currentPage) {
+                viewModel.setMainScreenPage(pagerState.currentPage)
+            }
 
-        Scaffold(
-            contentWindowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
-            bottomBar = {
-                NavigationBar {
-                    bottomBarItems.forEachIndexed { index, screen ->
-                        NavigationBarItem(
-                            icon = { Icon(painterResource(id = screen.iconResId), contentDescription = stringResource(screen.stringResId)) },
-                            label = { Text(stringResource(screen.stringResId)) },
-                            selected = pagerState.currentPage == index,
-                            onClick = { scope.launch { pagerState.animateScrollToPage(index) } }
+            Scaffold(
+                contentWindowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
+                bottomBar = {
+                    NavigationBar {
+                        bottomBarItems.forEachIndexed { index, screen ->
+                            NavigationBarItem(
+                                icon = { Icon(painterResource(id = screen.iconResId), contentDescription = stringResource(screen.stringResId)) },
+                                label = { Text(stringResource(screen.stringResId)) },
+                                selected = pagerState.currentPage == index,
+                                onClick = { scope.launch { pagerState.animateScrollToPage(index) } }
+                            )
+                        }
+                    }
+                }
+            ) { innerPadding ->
+                HorizontalPager(
+                    state = pagerState,
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .padding(innerPadding),
+                    key = { bottomBarItems[it].route },
+                    beyondViewportPageCount = 1,
+                    userScrollEnabled = false
+                ) { page ->
+                    when (page) {
+                        0 -> HomeScreen(
+                            viewModel = viewModel,
+                            windowSizeClass = windowSizeClass,
+                            navController = navController
                         )
+                        1 -> LibraryScreen(viewModel = viewModel)
                     }
                 }
             }
-        ) { innerPadding ->
-            HorizontalPager(
-                state = pagerState,
-                modifier = Modifier
-                    .fillMaxSize()
-                    .padding(innerPadding),
-                key = { bottomBarItems[it].route },
-                beyondViewportPageCount = 1,
-                userScrollEnabled = false
-            ) { page ->
-                when (page) {
-                    0 -> HomeScreen(
-                        viewModel = viewModel,
-                        windowSizeClass = windowSizeClass,
-                        navController = navController
-                    )
-                    1 -> LibraryScreen(viewModel = viewModel)
-                }
-            }
+        }
+
+        if (uiState.showTagSelectionDialogFor.isNotEmpty()) {
+            TagSelectionBottomSheet(
+                allTags = uiState.allTags,
+                selectedBookIds = uiState.showTagSelectionDialogFor,
+                booksWithTags = uiState.rawLibraryFiles,
+                onCreateAndAssign = { name ->
+                    viewModel.createAndAssignTag(name, uiState.showTagSelectionDialogFor)
+                },
+                onToggleTag = { tagId, assign ->
+                    viewModel.toggleTagForBooks(tagId, uiState.showTagSelectionDialogFor, assign)
+                },
+                onDismiss = viewModel::closeTagSelection
+            )
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/MetadataExtractionWorker.kt

@@ -7,6 +7,7 @@ import androidx.work.CoroutineWorker
 import androidx.work.WorkerParameters
 import com.aryan.reader.data.RecentFilesRepository
 import com.aryan.reader.epub.EpubParser
+import com.aryan.reader.epub.ImportedFileCache
 import com.aryan.reader.epub.MobiParser
 import com.aryan.reader.pdf.PdfCoverGenerator
 import io.legere.pdfiumandroid.PdfiumCore
@@ -55,6 +56,13 @@ class MetadataExtractionWorker(
 
                 if (item.sourceFolderUri == null) return@forEach
 
+                val tempExtractionDir =
+                    if (item.type == FileType.EPUB || item.type == FileType.MOBI || item.type == FileType.ODT || item.type == FileType.FODT) {
+                        ImportedFileCache.createTemporaryBookDir(appContext, item.bookId, "metadata")
+                    } else {
+                        null
+                    }
+
                 try {
                     val uri = item.uriString?.toUri() ?: return@forEach
                     val type = item.type
@@ -86,7 +94,8 @@ class MetadataExtractionWorker(
                                     inputStream = inputStream,
                                     bookId = item.bookId,
                                     originalBookNameHint = item.displayName,
-                                    parseContent = false
+                                    parseContent = false,
+                                    extractionDirOverride = tempExtractionDir
                                 )
                                 title = book.title.takeIf { it.isNotBlank() && it != "content" }
                                 author = book.author.takeIf { it.isNotBlank() && !it.equals("Unknown", ignoreCase = true) }
@@ -97,7 +106,8 @@ class MetadataExtractionWorker(
                                     inputStream = inputStream,
                                     bookId = item.bookId,
                                     originalBookNameHint = item.displayName,
-                                    parseContent = false
+                                    parseContent = false,
+                                    extractionDirOverride = tempExtractionDir
                                 )
                                 book?.let {
                                     title = it.title.takeIf { t -> t.isNotBlank() && t != "content" }
@@ -139,7 +149,8 @@ class MetadataExtractionWorker(
                                     bookId = item.bookId,
                                     originalBookNameHint = item.displayName,
                                     isFlat = type == FileType.FODT,
-                                    parseContent = false
+                                    parseContent = false,
+                                    extractionDirOverride = tempExtractionDir
                                 )
                                 title = book.title.takeIf { it.isNotBlank() && it != "content" }
                                 author = book.author.takeIf { it.isNotBlank() && !it.equals("Unknown", ignoreCase = true) }
@@ -166,13 +177,16 @@ class MetadataExtractionWorker(
                     Timber.tag("MetadataWorker").e(e, "Failed to extract metadata for ${item.displayName}")
                 } finally {
                     try {
-                        val cacheDir = File(appContext.cacheDir, "imported_file_${item.bookId}")
-                        if (cacheDir.exists()) {
-                            val deleted = cacheDir.deleteRecursively()
-                            if (deleted) Timber.tag("MetadataWorker").d("Cleaned up extraction cache for ${item.bookId}")
+                        if (tempExtractionDir?.exists() == true) {
+                            val deleted = tempExtractionDir.deleteRecursively()
+                            if (deleted) {
+                                Timber.tag("MetadataWorker")
+                                    .d("Cleaned up temporary extraction cache for ${item.bookId}")
+                            }
                         }
                     } catch (e: Exception) {
-                        Timber.tag("MetadataWorker").e(e, "Failed to clean up extraction cache for ${item.bookId}")
+                        Timber.tag("MetadataWorker")
+                            .e(e, "Failed to clean up temporary extraction cache for ${item.bookId}")
                     }
                 }
             }
@@ -183,4 +197,4 @@ class MetadataExtractionWorker(
             return@withContext Result.failure()
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/SharedComposables.kt

@@ -33,7 +33,19 @@ import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.slideInVertically
 import androidx.compose.animation.slideOutVertically
+import androidx.compose.ui.state.ToggleableState
+import androidx.compose.material3.TriStateCheckbox
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.rememberModalBottomSheetState
+import com.aryan.reader.data.TagEntity
+import androidx.compose.material.icons.filled.Search
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -90,7 +102,6 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.drawWithContent
-import androidx.compose.ui.graphics.luminance
 import androidx.compose.ui.platform.LocalClipboardManager
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalUriHandler
@@ -220,6 +231,7 @@ fun ContextualTopAppBar(
     selectedItemCount: Int,
     onNavIconClick: () -> Unit,
     onInfoClick: (() -> Unit)? = null,
+    onTagClick: (() -> Unit)? = null,
     onSelectAllClick: (() -> Unit)? = null,
     onPinClick: (() -> Unit)? = null,
     onDeleteClick: () -> Unit
@@ -232,6 +244,11 @@ fun ContextualTopAppBar(
             }
         },
         actions = {
+            if (onTagClick != null) {
+                IconButton(onClick = onTagClick) {
+                    Icon(painterResource(id = R.drawable.tag), contentDescription = "Tag")
+                }
+            }
             if (onPinClick != null) {
                 IconButton(onClick = onPinClick) {
                     Icon(Icons.Filled.PushPin, contentDescription = stringResource(R.string.pin_unpin))
@@ -342,7 +359,7 @@ fun DeleteConfirmationDialog(
 }
 
 @Composable
-fun FileInfoDialog(item: RecentFileItem, onDismiss: () -> Unit, onUpdateName: (String?) -> Unit) {
+fun FileInfoDialog(item: RecentFileItem, onDismiss: () -> Unit, onUpdateName: (String?) -> Unit, onOpenTags: () -> Unit) {
     LocalContext.current
     @Suppress("DEPRECATION") val clipboardManager = LocalClipboardManager.current
 
@@ -465,6 +482,14 @@ fun FileInfoDialog(item: RecentFileItem, onDismiss: () -> Unit, onUpdateName: (S
                     item.author?.takeIf { it.isNotBlank() && !it.equals("Unknown", ignoreCase = true) }?.let {
                         InfoRowDetailed(stringResource(R.string.author), it)
                     }
+                    item.seriesName?.takeIf { it.isNotBlank() }?.let { series ->
+                        val seriesText = if (item.seriesIndex != null && item.seriesIndex > 0) {
+                            "$series #${item.seriesIndex.toInt()}"
+                        } else {
+                            series
+                        }
+                        InfoRowDetailed("Series", seriesText)
+                    }
                     InfoRowDetailed(stringResource(R.string.format), item.type.name)
                     InfoRowDetailed(stringResource(R.string.size), formatFileSize(item.fileSize))
                     InfoRowDetailed(stringResource(R.string.added), formattedDate)
@@ -488,6 +513,19 @@ fun FileInfoDialog(item: RecentFileItem, onDismiss: () -> Unit, onUpdateName: (S
                     )
                 }
 
+                HorizontalDivider(modifier = Modifier.padding(vertical = 4.dp))
+
+                Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween, verticalAlignment = Alignment.CenterVertically) {
+                    Text("Tags", style = MaterialTheme.typography.titleSmall, fontWeight = FontWeight.SemiBold)
+                    TextButton(onClick = onOpenTags) { Text("+ Add / Edit") }
+                }
+
+                if (item.tags.isNotEmpty()) {
+                    BookTagChipsRow(tags = item.tags, compact = false)
+                } else {
+                    Text("No tags assigned.", style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant)
+                }
+
                 Row(
                     modifier = Modifier
                         .fillMaxWidth()
@@ -901,6 +939,53 @@ fun FileTypeBadge(type: FileType, modifier: Modifier = Modifier, overlay: Boolea
     }
 }
 
+private fun TagEntity.displayColor(): Color = Color(color ?: 0xFF64B5F6.toInt())
+
+@Composable
+fun BookTagChipsRow(
+    tags: List<TagEntity>,
+    modifier: Modifier = Modifier,
+    compact: Boolean = true,
+) {
+    if (tags.isEmpty()) return
+
+    Row(
+        modifier = modifier.horizontalScroll(rememberScrollState()),
+        horizontalArrangement = Arrangement.spacedBy(if (compact) 6.dp else 8.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        tags.forEach { tag ->
+            val tagColor = tag.displayColor()
+            Surface(
+                shape = RoundedCornerShape(50),
+                color = tagColor.copy(alpha = 0.14f),
+                contentColor = tagColor
+            ) {
+                Row(
+                    modifier = Modifier.padding(
+                        horizontal = if (compact) 8.dp else 10.dp,
+                        vertical = if (compact) 4.dp else 6.dp
+                    ),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(6.dp)
+                ) {
+                    Box(
+                        modifier = Modifier
+                            .size(if (compact) 6.dp else 8.dp)
+                            .background(tagColor, androidx.compose.foundation.shape.CircleShape)
+                    )
+                    Text(
+                        text = tag.name,
+                        style = if (compact) MaterialTheme.typography.labelSmall else MaterialTheme.typography.labelMedium,
+                        fontWeight = FontWeight.Medium,
+                        maxLines = 1
+                    )
+                }
+            }
+        }
+    }
+}
+
 private const val UNKNOWN_AUTHOR_LABEL = "No author listed"
 
 fun RecentFileItem.cardTitle(): String {
@@ -1046,4 +1131,92 @@ fun ReadingProgressSection(
             trackColor = MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.4f)
         )
     }
-}
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun TagSelectionBottomSheet(
+    allTags: List<TagEntity>,
+    selectedBookIds: Set<String>,
+    booksWithTags: List<RecentFileItem>,
+    onCreateAndAssign: (String) -> Unit,
+    onToggleTag: (String, Boolean) -> Unit,
+    onDismiss: () -> Unit
+) {
+    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    var searchQuery by remember { mutableStateOf("") }
+
+    val filteredTags = remember(allTags, searchQuery) {
+        if (searchQuery.isBlank()) allTags else allTags.filter { it.name.contains(searchQuery, ignoreCase = true) }
+    }
+
+    val exactMatch = allTags.any { it.name.equals(searchQuery.trim(), ignoreCase = true) }
+
+    ModalBottomSheet(onDismissRequest = onDismiss, sheetState = sheetState) {
+        Column(modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 8.dp).heightIn(max = 500.dp)) {
+            Text("Apply Tags", style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold, modifier = Modifier.padding(bottom = 16.dp))
+
+            androidx.compose.material3.OutlinedTextField(
+                value = searchQuery,
+                onValueChange = { searchQuery = it },
+                modifier = Modifier.fillMaxWidth(),
+                placeholder = { Text("Search or create tag...") },
+                singleLine = true,
+                shape = RoundedCornerShape(16.dp),
+                leadingIcon = { Icon(Icons.Default.Search, null) }
+            )
+
+            Spacer(modifier = Modifier.height(16.dp))
+
+            LazyColumn(modifier = Modifier.fillMaxWidth().weight(1f, fill = false)) {
+                if (searchQuery.isNotBlank() && !exactMatch) {
+                    item {
+                        Row(
+                            modifier = Modifier.fillMaxWidth().clickable {
+                                onCreateAndAssign(searchQuery)
+                                searchQuery = ""
+                            }.padding(vertical = 12.dp),
+                            verticalAlignment = Alignment.CenterVertically
+                        ) {
+                            Icon(Icons.Default.Add, null, tint = MaterialTheme.colorScheme.primary)
+                            Spacer(modifier = Modifier.width(16.dp))
+                            Text("Create \"${searchQuery.trim()}\"", color = MaterialTheme.colorScheme.primary)
+                        }
+                    }
+                }
+
+                items(filteredTags, key = { it.id }) { tag ->
+                    var checkedCount = 0
+                    selectedBookIds.forEach { bookId ->
+                        val book = booksWithTags.find { it.bookId == bookId }
+                        if (book?.tags?.any { it.id == tag.id } == true) checkedCount++
+                    }
+
+                    val state = when (checkedCount) {
+                        0 -> ToggleableState.Off
+                        selectedBookIds.size -> ToggleableState.On
+                        else -> ToggleableState.Indeterminate
+                    }
+
+                    Row(
+                        modifier = Modifier.fillMaxWidth().clickable {
+                            val assign = state != ToggleableState.On
+                            onToggleTag(tag.id, assign)
+                        }.padding(vertical = 4.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        TriStateCheckbox(state = state, onClick = null)
+                        Spacer(modifier = Modifier.width(16.dp))
+                        Surface(shape = androidx.compose.foundation.shape.CircleShape, color = Color(tag.color ?: 0xFF64B5F6.toInt()).copy(alpha = 0.2f), modifier = Modifier.size(24.dp)) {
+                            Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                                Icon(painterResource(id = R.drawable.tag), contentDescription = null, modifier = Modifier.size(12.dp), tint = Color(tag.color ?: 0xFF64B5F6.toInt()))
+                            }
+                        }
+                        Spacer(modifier = Modifier.width(12.dp))
+                        Text(tag.name, style = MaterialTheme.typography.bodyLarge)
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/aryan/reader/data/AppDatabase.kt

@@ -27,11 +27,24 @@ import androidx.room.TypeConverters
 import androidx.room.migration.Migration
 import androidx.sqlite.db.SupportSQLiteDatabase
 
-@Database(entities =[RecentFileEntity::class, CustomFontEntity::class], version = 16, exportSchema = false)
+@Database(
+    entities =[
+        RecentFileEntity::class,
+        CustomFontEntity::class,
+        ShelfEntity::class,
+        BookShelfCrossRef::class,
+        TagEntity::class,
+        BookTagCrossRef::class
+    ],
+    version = 18,
+    exportSchema = false
+)
 @TypeConverters(FileTypeConverter::class)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun recentFileDao(): RecentFileDao
     abstract fun customFontDao(): CustomFontDao
+    abstract fun shelfDao(): ShelfDao
+    abstract fun tagDao(): TagDao
 
     companion object {
         @Volatile
@@ -191,6 +204,53 @@ abstract class AppDatabase : RoomDatabase() {
             }
         }
 
+        val MIGRATION_16_17 = object : Migration(16, 17) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("ALTER TABLE recent_files ADD COLUMN seriesName TEXT DEFAULT NULL")
+                db.execSQL("ALTER TABLE recent_files ADD COLUMN seriesIndex REAL DEFAULT NULL")
+                db.execSQL("ALTER TABLE recent_files ADD COLUMN description TEXT DEFAULT NULL")
+            }
+        }
+
+        val MIGRATION_17_18 = object : Migration(17, 18) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("""
+                    CREATE TABLE IF NOT EXISTS `shelves` (
+                        `id` TEXT NOT NULL, `name` TEXT NOT NULL, `isSmart` INTEGER NOT NULL, 
+                        `smartRulesJson` TEXT, `createdAt` INTEGER NOT NULL, `updatedAt` INTEGER NOT NULL, 
+                        `isDeleted` INTEGER NOT NULL, PRIMARY KEY(`id`)
+                    )
+                """)
+                db.execSQL("""
+                    CREATE TABLE IF NOT EXISTS `tags` (
+                        `id` TEXT NOT NULL, `name` TEXT NOT NULL, `color` INTEGER, 
+                        `createdAt` INTEGER NOT NULL, PRIMARY KEY(`id`)
+                    )
+                """)
+                db.execSQL("""
+                    CREATE TABLE IF NOT EXISTS `book_shelf_cross_ref` (
+                        `bookId` TEXT NOT NULL, `shelfId` TEXT NOT NULL, `addedAt` INTEGER NOT NULL, 
+                        PRIMARY KEY(`bookId`, `shelfId`),
+                        FOREIGN KEY(`bookId`) REFERENCES `recent_files`(`bookId`) ON UPDATE NO ACTION ON DELETE CASCADE,
+                        FOREIGN KEY(`shelfId`) REFERENCES `shelves`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE
+                    )
+                """)
+                db.execSQL("CREATE INDEX IF NOT EXISTS `index_book_shelf_cross_ref_shelfId` ON `book_shelf_cross_ref` (`shelfId`)")
+                db.execSQL("CREATE INDEX IF NOT EXISTS `index_book_shelf_cross_ref_bookId` ON `book_shelf_cross_ref` (`bookId`)")
+
+                db.execSQL("""
+                    CREATE TABLE IF NOT EXISTS `book_tag_cross_ref` (
+                        `bookId` TEXT NOT NULL, `tagId` TEXT NOT NULL, 
+                        PRIMARY KEY(`bookId`, `tagId`),
+                        FOREIGN KEY(`bookId`) REFERENCES `recent_files`(`bookId`) ON UPDATE NO ACTION ON DELETE CASCADE,
+                        FOREIGN KEY(`tagId`) REFERENCES `tags`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE
+                    )
+                """)
+                db.execSQL("CREATE INDEX IF NOT EXISTS `index_book_tag_cross_ref_tagId` ON `book_tag_cross_ref` (`tagId`)")
+                db.execSQL("CREATE INDEX IF NOT EXISTS `index_book_tag_cross_ref_bookId` ON `book_tag_cross_ref` (`bookId`)")
+            }
+        }
+
         fun getDatabase(context: Context): AppDatabase {
             return INSTANCE ?: synchronized(this) {
                 val instance = Room.databaseBuilder(
@@ -202,7 +262,8 @@ abstract class AppDatabase : RoomDatabase() {
                         MIGRATION_1_2, MIGRATION_2_3, MIGRATION_3_4, MIGRATION_4_5,
                         MIGRATION_5_6, MIGRATION_6_7, MIGRATION_7_8, MIGRATION_8_9,
                         MIGRATION_9_10, MIGRATION_10_11, MIGRATION_11_12,
-                        MIGRATION_12_13, MIGRATION_13_14, MIGRATION_14_15, MIGRATION_15_16
+                        MIGRATION_12_13, MIGRATION_13_14, MIGRATION_14_15, MIGRATION_15_16,
+                        MIGRATION_16_17, MIGRATION_17_18
                     )
                     .fallbackToDestructiveMigration(false)
                     .build()

app/src/main/java/com/aryan/reader/data/LibraryDaos.kt

@@ -0,0 +1,61 @@
+package com.aryan.reader.data
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ShelfDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertShelf(shelf: ShelfEntity)
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun insertBookShelfCrossRefs(crossRefs: List<BookShelfCrossRef>)
+
+    @Query("SELECT * FROM shelves WHERE isDeleted = 0 ORDER BY name ASC")
+    fun getAllActiveShelves(): Flow<List<ShelfEntity>>
+
+    @Query("SELECT * FROM book_shelf_cross_ref")
+    fun getAllBookShelfCrossRefs(): Flow<List<BookShelfCrossRef>>
+
+    @Query("DELETE FROM book_shelf_cross_ref WHERE shelfId = :shelfId AND bookId IN (:bookIds)")
+    suspend fun removeBooksFromShelf(shelfId: String, bookIds: List<String>)
+
+    @Query("UPDATE shelves SET isDeleted = 1, updatedAt = :timestamp WHERE id = :shelfId")
+    suspend fun markShelfAsDeleted(shelfId: String, timestamp: Long)
+
+    @Query("UPDATE shelves SET name = :newName, updatedAt = :timestamp WHERE id = :shelfId")
+    suspend fun updateShelfName(shelfId: String, newName: String, timestamp: Long)
+
+    @Query("SELECT * FROM shelves WHERE id = :shelfId")
+    suspend fun getShelfById(shelfId: String): ShelfEntity?
+
+    @Query("SELECT * FROM book_shelf_cross_ref WHERE shelfId = :shelfId")
+    suspend fun getCrossRefsForShelf(shelfId: String): List<BookShelfCrossRef>
+}
+
+@Dao
+interface TagDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertTag(tag: TagEntity)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertTags(tags: List<TagEntity>)
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun insertBookTagCrossRef(crossRef: BookTagCrossRef)
+
+    @Query("SELECT * FROM tags ORDER BY name ASC")
+    fun getAllTags(): Flow<List<TagEntity>>
+
+    @Query("SELECT * FROM book_tag_cross_ref")
+    fun getAllBookTagCrossRefs(): Flow<List<BookTagCrossRef>>
+
+    @Query("SELECT COUNT(*) FROM tags")
+    suspend fun getTagCount(): Int
+
+    @Query("DELETE FROM book_tag_cross_ref WHERE tagId = :tagId AND bookId = :bookId")
+    suspend fun removeTagFromBook(tagId: String, bookId: String)
+}

app/src/main/java/com/aryan/reader/data/LibraryEntities.kt

@@ -0,0 +1,74 @@
+package com.aryan.reader.data
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "shelves")
+data class ShelfEntity(
+    @PrimaryKey val id: String,
+    val name: String,
+    val isSmart: Boolean = false,
+    val smartRulesJson: String? = null,
+    val createdAt: Long,
+    val updatedAt: Long,
+    val isDeleted: Boolean = false
+)
+
+@Entity(
+    tableName = "book_shelf_cross_ref",
+    primaryKeys =["bookId", "shelfId"],
+    foreignKeys =[
+        ForeignKey(
+            entity = RecentFileEntity::class,
+            parentColumns = ["bookId"],
+            childColumns = ["bookId"],
+            onDelete = ForeignKey.CASCADE
+        ),
+        ForeignKey(
+            entity = ShelfEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["shelfId"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices = [Index(value = ["shelfId"]), Index(value = ["bookId"])]
+)
+data class BookShelfCrossRef(
+    val bookId: String,
+    val shelfId: String,
+    val addedAt: Long
+)
+
+@Entity(tableName = "tags")
+data class TagEntity(
+    @PrimaryKey val id: String,
+    val name: String,
+    val color: Int? = null,
+    val createdAt: Long
+)
+
+@Entity(
+    tableName = "book_tag_cross_ref",
+    primaryKeys = ["bookId", "tagId"],
+    foreignKeys =[
+        ForeignKey(
+            entity = RecentFileEntity::class,
+            parentColumns = ["bookId"],
+            childColumns = ["bookId"],
+            onDelete = ForeignKey.CASCADE
+        ),
+        ForeignKey(
+            entity = TagEntity::class,
+            parentColumns = ["id"],
+            childColumns =["tagId"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices =[Index(value = ["tagId"]), Index(value = ["bookId"])]
+)
+data class BookTagCrossRef(
+    val bookId: String,
+    val tagId: String
+)

app/src/main/java/com/aryan/reader/data/LocalSyncUtils.kt

@@ -72,34 +72,14 @@ object LocalSyncUtils {
             val syncDir = getOrCreateSyncDir(rootTree) ?: return@withContext
 
             val syncFileName = ".${metadata.bookId}.json"
-            val legacyVisibleName = "${metadata.bookId}.json"
-
-            val existingHidden = syncDir.findFile(syncFileName)
-            val existingVisible = syncDir.findFile(legacyVisibleName)
-            val fileToCheck = existingHidden ?: existingVisible
-
-            if (fileToCheck != null && fileToCheck.exists()) {
-                try {
-                    val existingContent = context.contentResolver.openInputStream(fileToCheck.uri)?.use { input ->
-                        input.bufferedReader().use { it.readText() }
-                    }
-                    if (existingContent != null) {
-                        val existingMeta = FolderBookMetadata.fromJsonString(existingContent)
-                        if (existingMeta.lastModifiedTimestamp > metadata.lastModifiedTimestamp) {
-                            Timber.tag(TAG).w("ClobberCheck: ABORTING save. Folder has newer data for ${metadata.bookId}.")
-                            return@withContext
-                        }
-                    }
-                } catch (_: Exception) {}
-            }
-
-            if (existingVisible != null && existingVisible.exists()) {
-                try { existingVisible.delete() } catch (_: Exception) {}
+            val existingMeta = resolveAndCleanMetadataConflicts(context, syncDir, metadata.bookId)
+            if (existingMeta != null && existingMeta.lastModifiedTimestamp > metadata.lastModifiedTimestamp) {
+                Timber.tag(TAG).w("ClobberCheck: ABORTING save. Folder has newer data for ${metadata.bookId}.")
+                return@withContext
             }
 
             val tempFileName = ".${metadata.bookId}.tmp"
             syncDir.findFile(tempFileName)?.delete()
-
             val tempFile = syncDir.createFile("application/json", tempFileName)
             if (tempFile == null) {
                 Timber.tag(TAG).e("Could not create temp metadata file for ${metadata.bookId}")
@@ -128,7 +108,7 @@ object LocalSyncUtils {
             }
 
             @Suppress("KotlinConstantConditions") if (writeSuccess) {
-                val targetFile = rootTree.findFile(syncFileName)
+                val targetFile = syncDir.findFile(syncFileName)
                 if (targetFile != null && targetFile.exists()) {
                     targetFile.delete()
                 }
@@ -169,8 +149,8 @@ object LocalSyncUtils {
             val currentBest = resolveAndCleanAnnotationConflicts(context, syncDir, bookId)
             val targetName = ".${bookId}${ANNOTATION_SUFFIX}.json"
             val tempName = ".${bookId}${ANNOTATION_SUFFIX}.tmp"
+            syncDir.findFile(tempName)?.delete()
             val tempFile = syncDir.createFile("application/json", tempName)
-            val existingMain = syncDir.findFile(targetName)
 
             if (currentBest != null) {
                 val (remoteTs, _) = currentBest
@@ -186,8 +166,6 @@ object LocalSyncUtils {
             wrapper.put("data", JSONObject(jsonPayload))
             val contentBytes = wrapper.toString().toByteArray()
 
-            syncDir.findFile(tempName)?.delete()
-
             if (tempFile == null) {
                 Timber.tag("FolderAnnotationSync").e("Failed to create temp sidecar file.")
                 return@withContext
@@ -210,7 +188,7 @@ object LocalSyncUtils {
             }
 
             @Suppress("KotlinConstantConditions") if (writeSuccess) {
-                val existingMain = rootTree.findFile(targetName)
+                val existingMain = syncDir.findFile(targetName)
                 if (existingMain != null) {
                     if (!existingMain.delete()) {
                         Timber.tag("FolderAnnotationSync").w("Failed to delete existing sidecar before rename. Attempting rename anyway (might fail on some SAF providers).")
@@ -238,55 +216,14 @@ object LocalSyncUtils {
         try {
             val syncDir = rootTree.findFile(SYNC_SUBFOLDER_NAME)
             if (syncDir == null || !syncDir.isDirectory) return@withContext results
-            val allFiles = syncDir.listFiles()
+            val bookIds = syncDir.listFiles()
+                .mapNotNull { extractAnnotationBookId(it.name) }
+                .toSet()
 
-            val annotationFiles = allFiles.filter { file ->
-                val name = file.name ?: ""
-                name.contains(ANNOTATION_SUFFIX) && name.endsWith(".json") && !name.endsWith(".tmp")
-            }
-
-            val filesByBookId = annotationFiles.groupBy { file ->
-                val name = file.name ?: ""
-                var temp = name.substringBeforeLast(".json")
-                if (temp.contains(".sync-conflict")) {
-                    temp = temp.substringBefore(".sync-conflict")
-                }
-                if (temp.endsWith(ANNOTATION_SUFFIX)) {
-                    temp = temp.substring(0, temp.length - ANNOTATION_SUFFIX.length)
-                }
-                if (temp.startsWith(".")) {
-                    temp = temp.substring(1)
-                }
-                temp
-            }
-
-            filesByBookId.forEach { (bookId, files) ->
-                if (bookId.isNotBlank()) {
-                    var bestTs = -1L
-                    var bestData: String? = null
-
-                    for (file in files) {
-                        try {
-                            val content = context.contentResolver.openInputStream(file.uri)?.use {
-                                it.bufferedReader().readText()
-                            } ?: continue
-
-                            val json = JSONObject(content)
-                            val ts = json.optLong("timestamp", 0L)
-                            val data = json.optJSONObject("data")?.toString()
-
-                            if (data != null && ts > bestTs) {
-                                bestTs = ts
-                                bestData = data
-                            }
-                        } catch (e: Exception) {
-                            Timber.tag("FolderAnnotationSync").e(e, "Error parsing preloaded file: ${file.name}")
-                        }
-                    }
-
-                    if (bestData != null) {
-                        results[bookId] = Pair(bestTs, bestData)
-                    }
+            for (bookId in bookIds) {
+                val best = resolveAndCleanAnnotationConflicts(context, syncDir, bookId)
+                if (best != null) {
+                    results[bookId] = best
                 }
             }
         } catch (e: Exception) {
@@ -319,15 +256,16 @@ object LocalSyncUtils {
         bookId: String
     ): Pair<Long, String>? {
         val basePattern = ".${bookId}${ANNOTATION_SUFFIX}"
+        val legacyPattern = "${bookId}${ANNOTATION_SUFFIX}"
 
         val allFiles = syncDir.listFiles()
 
         val candidates = allFiles.filter { file ->
             val name = file.name ?: ""
-            name.startsWith(basePattern) &&
-                    name.endsWith(".json") &&
-                    !name.endsWith(".tmp") &&
-                    !name.contains(".syncthing.")
+            (name.startsWith(basePattern) || name.startsWith(legacyPattern)) &&
+                name.endsWith(".json") &&
+                !name.endsWith(".tmp") &&
+                !name.contains(".syncthing.")
         }
 
         if (candidates.isEmpty()) return null
@@ -460,16 +398,76 @@ object LocalSyncUtils {
                 }
             }
 
-            // 3. Migrate Legacy to Hidden if needed
-            val winnerName = bestFile.name ?: ""
-            if (!winnerName.startsWith(".")) {
-                Timber.tag(TAG).i("Migrating legacy file to hidden: $winnerName")
+            val correctName = ".${bookId}.json"
+            if (bestFile.name != correctName) {
+                Timber.tag(TAG).i("Renaming metadata winner ${bestFile.name} to $correctName")
+                bestFile.renameTo(correctName)
             }
         }
 
         return bestMeta
     }
 
+    private fun resolveAndCleanMetadataConflicts(
+        context: Context,
+        syncDir: DocumentFile,
+        bookId: String
+    ): FolderBookMetadata? {
+        val candidates = syncDir.listFiles().filter { file ->
+            val name = file.name ?: ""
+            val normalizedName = if (name.startsWith(".")) name.substring(1) else name
+            normalizedName == "$bookId.json" ||
+                normalizedName.startsWith("$bookId.sync-conflict") ||
+                normalizedName.startsWith("$bookId.json.sync-conflict")
+        }
+        if (candidates.isEmpty()) return null
+        return resolveAndCleanConflicts(context, candidates, bookId)
+    }
+
+    private fun extractAnnotationBookId(name: String?): String? {
+        if (name.isNullOrBlank()) return null
+        var temp = name
+        if (!temp.contains(ANNOTATION_SUFFIX) || !temp.endsWith(".json") || temp.endsWith(".tmp")) return null
+        if (temp.contains(".sync-conflict")) {
+            temp = temp.substringBefore(".sync-conflict")
+        }
+        temp = temp.substringBeforeLast(".json")
+        if (temp.endsWith(ANNOTATION_SUFFIX)) {
+            temp = temp.substring(0, temp.length - ANNOTATION_SUFFIX.length)
+        }
+        if (temp.startsWith(".")) {
+            temp = temp.substring(1)
+        }
+        return temp.ifBlank { null }
+    }
+
+    suspend fun deleteBookSidecars(
+        context: Context,
+        sourceFolderUri: Uri,
+        bookId: String
+    ) = withContext(Dispatchers.IO) {
+        try {
+            val rootTree = DocumentFile.fromTreeUri(context, sourceFolderUri) ?: return@withContext
+            val syncDir = rootTree.findFile(SYNC_SUBFOLDER_NAME) ?: return@withContext
+            val targets = syncDir.listFiles().filter { file ->
+                val name = file.name ?: return@filter false
+                val normalized = if (name.startsWith(".")) name.substring(1) else name
+                normalized == "$bookId.json" ||
+                    normalized.startsWith("$bookId.sync-conflict") ||
+                    normalized.startsWith("$bookId.json.sync-conflict") ||
+                    normalized.startsWith("$bookId${ANNOTATION_SUFFIX}")
+            }
+            targets.forEach {
+                try {
+                    it.delete()
+                } catch (_: Exception) {
+                }
+            }
+        } catch (e: Exception) {
+            Timber.tag(TAG).e(e, "Failed to delete folder sidecars for $bookId")
+        }
+    }
+
     suspend fun getAllFolderMetadata(
         context: Context,
         sourceFolderUri: Uri
@@ -486,6 +484,7 @@ object LocalSyncUtils {
                 .filter {
                     val name = it.name ?: ""
                     (name.endsWith(".json") || name.contains(".sync-conflict")) &&
+                            !name.contains(ANNOTATION_SUFFIX) &&
                             !name.endsWith(".tmp") &&
                             !name.contains(".syncthing.")
                 }
@@ -513,4 +512,4 @@ object LocalSyncUtils {
         }
         return@withContext finalResults
     }
-}
+}

app/src/main/java/com/aryan/reader/data/RecentFileDao.kt

@@ -21,20 +21,19 @@
 package com.aryan.reader.data
 
 import androidx.room.Dao
-import androidx.room.Insert
-import androidx.room.OnConflictStrategy
 import androidx.room.Query
+import androidx.room.Upsert
 import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface RecentFileDao {
-    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    @Upsert
     suspend fun insertOrUpdateFile(file: RecentFileEntity)
 
-    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    @Upsert
     suspend fun insertOrUpdateFiles(files: List<RecentFileEntity>)
 
-    @Query("SELECT bookId, uriString, type, displayName, timestamp, coverImagePath, title, author, lastChapterIndex, lastPage, lastPositionCfi, progressPercentage, isRecent, isAvailable, lastModifiedTimestamp, isDeleted, locatorBlockIndex, locatorCharOffset, sourceFolderUri, isReflowPreferred, customName, fileSize FROM recent_files WHERE isDeleted = 0 ORDER BY timestamp DESC")
+    @Query("SELECT bookId, uriString, type, displayName, timestamp, coverImagePath, title, author, lastChapterIndex, lastPage, lastPositionCfi, progressPercentage, isRecent, isAvailable, lastModifiedTimestamp, isDeleted, locatorBlockIndex, locatorCharOffset, sourceFolderUri, isReflowPreferred, customName, fileSize, seriesName, seriesIndex, description FROM recent_files WHERE isDeleted = 0 ORDER BY timestamp DESC")
     fun getRecentFiles(): Flow<List<RecentFileSummary>>
 
     @Query("SELECT * FROM recent_files WHERE sourceFolderUri = :sourceFolderUri AND isDeleted = 0")
@@ -46,7 +45,7 @@ interface RecentFileDao {
     @Query("UPDATE recent_files SET isReflowPreferred = :isPreferred WHERE bookId = :bookId")
     suspend fun updateReflowPreference(bookId: String, isPreferred: Boolean)
 
-    @Query("SELECT bookId, uriString, type, displayName, timestamp, coverImagePath, title, author, lastChapterIndex, lastPage, lastPositionCfi, progressPercentage, isRecent, isAvailable, lastModifiedTimestamp, isDeleted, locatorBlockIndex, locatorCharOffset, sourceFolderUri, isReflowPreferred, customName, fileSize FROM recent_files WHERE isDeleted = 0 ORDER BY timestamp DESC LIMIT :limit")
+    @Query("SELECT bookId, uriString, type, displayName, timestamp, coverImagePath, title, author, lastChapterIndex, lastPage, lastPositionCfi, progressPercentage, isRecent, isAvailable, lastModifiedTimestamp, isDeleted, locatorBlockIndex, locatorCharOffset, sourceFolderUri, isReflowPreferred, customName, fileSize, seriesName, seriesIndex, description FROM recent_files WHERE isDeleted = 0 ORDER BY timestamp DESC LIMIT :limit")
     fun getRecentFilesList(limit: Int): List<RecentFileSummary>
 
     @Query("DELETE FROM recent_files WHERE bookId IN (:bookIds)")
@@ -99,4 +98,4 @@ interface RecentFileDao {
 
     @Query("UPDATE recent_files SET highlights = :highlightsJson, lastModifiedTimestamp = :timestamp WHERE bookId = :bookId")
     suspend fun updateHighlights(bookId: String, highlightsJson: String, timestamp: Long)
-}
+}

app/src/main/java/com/aryan/reader/data/RecentFileEntity.kt

@@ -51,7 +51,10 @@ data class RecentFileEntity(
     @ColumnInfo(defaultValue = "0") val isReflowPreferred: Boolean,
     @ColumnInfo(defaultValue = "NULL") val customName: String?,
     @ColumnInfo(defaultValue = "NULL") val highlights: String?,
-    @ColumnInfo(name = "fileSize", defaultValue = "0") val fileSize: Long
+    @ColumnInfo(name = "fileSize", defaultValue = "0") val fileSize: Long,
+    @ColumnInfo(defaultValue = "NULL") val seriesName: String?,
+    @ColumnInfo(defaultValue = "NULL") val seriesIndex: Double?,
+    @ColumnInfo(defaultValue = "NULL") val description: String?
 )
 
 data class RecentFileSummary(
@@ -76,5 +79,8 @@ data class RecentFileSummary(
     @ColumnInfo(defaultValue = "NULL") val sourceFolderUri: String?,
     @ColumnInfo(defaultValue = "0") val isReflowPreferred: Boolean,
     @ColumnInfo(defaultValue = "NULL") val customName: String?,
-    @ColumnInfo(name = "fileSize", defaultValue = "0") val fileSize: Long
+    @ColumnInfo(name = "fileSize", defaultValue = "0") val fileSize: Long,
+    @ColumnInfo(defaultValue = "NULL") val seriesName: String?,
+    @ColumnInfo(defaultValue = "NULL") val seriesIndex: Double?,
+    @ColumnInfo(defaultValue = "NULL") val description: String?
 )

app/src/main/java/com/aryan/reader/data/RecentFileItem.kt

@@ -47,7 +47,11 @@ data class RecentFileItem(
     val isReflowPreferred: Boolean = false,
     val customName: String? = null,
     val highlightsJson: String? = null,
-    val fileSize: Long = 0L
+    val fileSize: Long = 0L,
+    val seriesName: String? = null,
+    val seriesIndex: Double? = null,
+    val description: String? = null,
+    val tags: List<TagEntity> = emptyList()
 ) {
     fun getUri(): Uri? = uriString?.toUri()
 }
@@ -77,7 +81,10 @@ fun RecentFileEntity.toRecentFileItem(): RecentFileItem {
         isReflowPreferred = this.isReflowPreferred,
         customName = this.customName,
         highlightsJson = this.highlights,
-        fileSize = this.fileSize
+        fileSize = this.fileSize,
+        seriesName = this.seriesName,
+        seriesIndex = this.seriesIndex,
+        description = this.description
     )
 }
 
@@ -106,7 +113,10 @@ fun RecentFileItem.toRecentFileEntity(): RecentFileEntity {
         isReflowPreferred = this.isReflowPreferred,
         customName = this.customName,
         highlights = this.highlightsJson,
-        fileSize = this.fileSize
+        fileSize = this.fileSize,
+        seriesName = this.seriesName,
+        seriesIndex = this.seriesIndex,
+        description = this.description
     )
 }
 
@@ -184,6 +194,9 @@ fun RecentFileSummary.toRecentFileItem(): RecentFileItem {
         isReflowPreferred = this.isReflowPreferred,
         customName = this.customName,
         highlightsJson = null,
-        fileSize = this.fileSize
+        fileSize = this.fileSize,
+        seriesName = this.seriesName,
+        seriesIndex = this.seriesIndex,
+        description = this.description
     )
 }

app/src/main/java/com/aryan/reader/data/RecentFilesRepository.kt

@@ -28,6 +28,7 @@ import timber.log.Timber
 import com.aryan.reader.BookImporter
 import com.aryan.reader.paginatedreader.Locator
 import com.aryan.reader.pdf.PdfRichTextRepository
+import com.aryan.reader.epub.ImportedFileCache
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
@@ -39,6 +40,8 @@ import com.aryan.reader.pdf.data.PageLayoutRepository
 import com.aryan.reader.pdf.data.PdfTextBoxRepository
 import org.json.JSONObject
 import org.json.JSONArray
+import java.util.UUID
+import androidx.core.content.edit
 
 private const val COVER_CACHE_DIR = "cover_cache"
 
@@ -54,6 +57,11 @@ class RecentFilesRepository(private val context: Context) {
     private val pdfTextBoxRepository = PdfTextBoxRepository(context)
     private val pdfHighlightRepository = com.aryan.reader.pdf.data.PdfHighlightRepository(context)
 
+    val activeShelvesFlow = AppDatabase.getDatabase(context).shelfDao().getAllActiveShelves()
+    val shelfCrossRefsFlow = AppDatabase.getDatabase(context).shelfDao().getAllBookShelfCrossRefs()
+    val tagsFlow = AppDatabase.getDatabase(context).tagDao().getAllTags()
+    val tagCrossRefsFlow = AppDatabase.getDatabase(context).tagDao().getAllBookTagCrossRefs()
+
     init {
         if (!coverCacheDir.exists()) {
             coverCacheDir.mkdirs()
@@ -74,6 +82,28 @@ class RecentFilesRepository(private val context: Context) {
         return@withContext recentFileDao.getFileByUri(uriString)?.toRecentFileItem()
     }
 
+    suspend fun addShelf(shelf: ShelfEntity) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).shelfDao().insertShelf(shelf)
+    }
+
+    suspend fun addBooksToShelf(shelfId: String, bookIds: List<String>) = withContext(Dispatchers.IO) {
+        val timestamp = System.currentTimeMillis()
+        val crossRefs = bookIds.map { BookShelfCrossRef(it, shelfId, timestamp) }
+        AppDatabase.getDatabase(context).shelfDao().insertBookShelfCrossRefs(crossRefs)
+    }
+
+    suspend fun renameShelf(shelfId: String, newName: String) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).shelfDao().updateShelfName(shelfId, newName, System.currentTimeMillis())
+    }
+
+    suspend fun deleteShelf(shelfId: String) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).shelfDao().markShelfAsDeleted(shelfId, System.currentTimeMillis())
+    }
+
+    suspend fun removeBooksFromShelf(shelfId: String, bookIds: List<String>) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).shelfDao().removeBooksFromShelf(shelfId, bookIds)
+    }
+
     suspend fun getFilesBySourceFolder(sourceFolderUri: String): List<RecentFileItem> = withContext(Dispatchers.IO) {
         return@withContext recentFileDao.getFilesBySourceFolder(sourceFolderUri).map { it.toRecentFileItem() }
     }
@@ -82,6 +112,26 @@ class RecentFilesRepository(private val context: Context) {
         return@withContext recentFileDao.getAllFiles().map { it.toRecentFileItem() }
     }
 
+    suspend fun createTag(tag: TagEntity) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).tagDao().insertTag(tag)
+    }
+
+    suspend fun seedTagsIfEmpty(tags: List<TagEntity>) = withContext(Dispatchers.IO) {
+        if (tags.isEmpty()) return@withContext
+        val tagDao = AppDatabase.getDatabase(context).tagDao()
+        if (tagDao.getTagCount() == 0) {
+            tagDao.insertTags(tags)
+        }
+    }
+
+    suspend fun assignTagToBook(bookId: String, tagId: String) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).tagDao().insertBookTagCrossRef(BookTagCrossRef(bookId, tagId))
+    }
+
+    suspend fun removeTagFromBook(bookId: String, tagId: String) = withContext(Dispatchers.IO) {
+        AppDatabase.getDatabase(context).tagDao().removeTagFromBook(tagId, bookId)
+    }
+
     suspend fun clearAllLocalData() = withContext(Dispatchers.IO) {
         recentFileDao.clearAll()
         if (coverCacheDir.exists()) {
@@ -131,7 +181,10 @@ class RecentFilesRepository(private val context: Context) {
                 isDeleted = item.isDeleted,
                 sourceFolderUri = item.sourceFolderUri ?: existingItem.sourceFolderUri,
                 highlights = item.highlightsJson ?: existingItem.highlights,
-                fileSize = if (item.fileSize > 0) item.fileSize else existingItem.fileSize
+                fileSize = if (item.fileSize > 0) item.fileSize else existingItem.fileSize,
+                seriesName = item.seriesName ?: existingItem.seriesName,
+                seriesIndex = item.seriesIndex ?: existingItem.seriesIndex,
+                description = item.description ?: existingItem.description
             )
         } else {
             item.toRecentFileEntity()
@@ -348,7 +401,9 @@ class RecentFilesRepository(private val context: Context) {
         if (item != null) {
             val currentTime = System.currentTimeMillis()
             recentFileDao.updatePdfReadingPosition(item.bookId, page, progress, currentTime)
-            Timber.d("Updated PDF reading position for ${item.bookId} to page $page, progress $progress%")
+            Timber.tag("PdfPositionDebug").i("Repository: Executed DB update for ${item.bookId} to Page $page, Progress $progress% at TS: $currentTime")
+        } else {
+            Timber.tag("PdfPositionDebug").e("Repository: DB Update Failed! No recent file found matching URI: $uriString")
         }
     }
 
@@ -400,8 +455,7 @@ class RecentFilesRepository(private val context: Context) {
                         pdfTextBoxRepository.getFileForSync(item.bookId).delete()
                         pdfHighlightRepository.getFileForSync(item.bookId).delete()
 
-                        val cacheDir = File(context.cacheDir, "imported_file_${item.bookId}")
-                        if (cacheDir.exists()) cacheDir.deleteRecursively()
+                        ImportedFileCache.clearBookCache(context, item.bookId)
                     } catch (e: Exception) {
                         Timber.e(e, "Error during deep cleanup of sidecars for ${item.bookId}: ${e.message}")
                     }
@@ -473,8 +527,10 @@ class RecentFilesRepository(private val context: Context) {
         renameSafely(pdfTextBoxRepository.getFileForSync(oldId), pdfTextBoxRepository.getFileForSync(newId))
         renameSafely(pdfHighlightRepository.getFileForSync(oldId), pdfHighlightRepository.getFileForSync(newId))
 
-        val oldCache = File(context.cacheDir, "imported_file_$oldId")
-        val newCache = File(context.cacheDir, "imported_file_$newId")
+        ImportedFileCache.clearTemporaryBookDirs(context, oldId)
+        ImportedFileCache.clearTemporaryBookDirs(context, newId)
+        val oldCache = ImportedFileCache.activeBookDir(context, oldId)
+        val newCache = ImportedFileCache.activeBookDir(context, newId)
         if (oldCache.exists()) {
             if (newCache.exists()) newCache.deleteRecursively()
             oldCache.renameTo(newCache)
@@ -486,8 +542,7 @@ class RecentFilesRepository(private val context: Context) {
         try {
             pdfRichTextRepository.getFileForSync(bookId).delete()
             pageLayoutRepository.getLayoutFile(bookId).delete()
-            val cacheDir = File(context.cacheDir, "imported_file_$bookId")
-            if (cacheDir.exists()) cacheDir.deleteRecursively()
+            ImportedFileCache.clearBookCache(context, bookId)
             Timber.d("Cleared layout and text caches for modified book: $bookId")
         } catch (e: Exception) {
             Timber.e(e, "Error clearing caches for $bookId")
@@ -502,4 +557,46 @@ class RecentFilesRepository(private val context: Context) {
         }
         Timber.d("Batch inserted/updated ${items.size} recent files in DB.")
     }
-}
+
+    suspend fun migrateLegacyShelvesToRoom() = withContext(Dispatchers.IO) {
+        val prefs = context.getSharedPreferences("reader_user_prefs", Context.MODE_PRIVATE)
+        if (prefs.getBoolean("is_shelves_migrated_to_room", false)) return@withContext
+
+        Timber.i("Starting migration of legacy SharedPreferences shelves to Room DB...")
+
+        val shelfNames = prefs.getStringSet("shelf_names", emptySet()) ?: emptySet()
+        if (shelfNames.isEmpty()) {
+            prefs.edit { putBoolean("is_shelves_migrated_to_room", true) }
+            return@withContext
+        }
+
+        val db = AppDatabase.getDatabase(context)
+        val shelfDao = db.shelfDao()
+
+        val validBookIds = recentFileDao.getAllFiles().map { it.bookId }.toSet()
+
+        shelfNames.forEach { name ->
+            val shelfId = UUID.nameUUIDFromBytes(name.toByteArray()).toString()
+            val timestamp = prefs.getLong("shelf_timestamp_$name", System.currentTimeMillis())
+            val isDeleted = prefs.getBoolean("shelf_deleted_$name", false)
+            val bookIds = prefs.getStringSet("shelf_content_$name", emptySet()) ?: emptySet()
+
+            val shelf = ShelfEntity(
+                id = shelfId, name = name, isSmart = false, smartRulesJson = null,
+                createdAt = timestamp, updatedAt = timestamp, isDeleted = isDeleted
+            )
+            shelfDao.insertShelf(shelf)
+
+            val crossRefs = bookIds.filter { it in validBookIds }.map { bookId ->
+                BookShelfCrossRef(bookId = bookId, shelfId = shelfId, addedAt = timestamp)
+            }
+
+            if (crossRefs.isNotEmpty()) {
+                shelfDao.insertBookShelfCrossRefs(crossRefs)
+            }
+        }
+
+        prefs.edit { putBoolean("is_shelves_migrated_to_room", true) }
+        Timber.i("Successfully migrated legacy shelves to Room.")
+    }
+}

app/src/main/java/com/aryan/reader/data/SmartCollectionEngine.kt

@@ -0,0 +1,81 @@
+package com.aryan.reader.data
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+@Serializable
+enum class SmartField { TITLE, AUTHOR, PROGRESS, FILE_TYPE, FOLDER, TAG }
+@Serializable
+enum class SmartOperator { EQUALS, CONTAINS, GREATER_THAN, LESS_THAN }
+
+@Serializable
+data class SmartRule(
+    val field: SmartField,
+    val operator: SmartOperator,
+    val value: String
+)
+
+@Serializable
+data class SmartCollectionDefinition(
+    val matchAll: Boolean = true,
+    val rules: List<SmartRule> = emptyList()
+)
+
+object SmartCollectionEngine {
+    private val json = Json {
+        encodeDefaults = true
+        ignoreUnknownKeys = true
+    }
+
+    fun toJson(definition: SmartCollectionDefinition): String = json.encodeToString(definition)
+
+    fun fromJson(json: String?): SmartCollectionDefinition? {
+        if (json.isNullOrBlank()) return null
+        return try {
+            this.json.decodeFromString<SmartCollectionDefinition>(json)
+        } catch (_: Exception) { null }
+    }
+
+    fun evaluate(book: RecentFileItem, definition: SmartCollectionDefinition): Boolean {
+        if (definition.rules.isEmpty()) return false
+
+        val results = definition.rules.map { rule ->
+            when (rule.field) {
+                SmartField.TITLE -> evaluateString(book.title ?: book.displayName, rule)
+                SmartField.AUTHOR -> evaluateString(book.author ?: "", rule)
+                SmartField.FILE_TYPE -> evaluateString(book.type.name, rule)
+                SmartField.FOLDER -> evaluateString(book.sourceFolderUri ?: "", rule)
+                SmartField.TAG -> evaluateTags(book.tags.map { it.name }, rule)
+                SmartField.PROGRESS -> evaluateNumber(book.progressPercentage ?: 0f, rule)
+            }
+        }
+        return if (definition.matchAll) results.all { it } else results.any { it }
+    }
+
+    private fun evaluateString(target: String, rule: SmartRule): Boolean {
+        return when (rule.operator) {
+            SmartOperator.EQUALS -> target.equals(rule.value, ignoreCase = true)
+            SmartOperator.CONTAINS -> target.contains(rule.value, ignoreCase = true)
+            else -> false
+        }
+    }
+
+    private fun evaluateNumber(target: Float, rule: SmartRule): Boolean {
+        val ruleValue = rule.value.toFloatOrNull() ?: return false
+        return when (rule.operator) {
+            SmartOperator.EQUALS -> target == ruleValue
+            SmartOperator.GREATER_THAN -> target > ruleValue
+            SmartOperator.LESS_THAN -> target < ruleValue
+            else -> false
+        }
+    }
+
+    private fun evaluateTags(tags: List<String>, rule: SmartRule): Boolean {
+        return when (rule.operator) {
+            SmartOperator.EQUALS -> tags.any { it.equals(rule.value, ignoreCase = true) }
+            SmartOperator.CONTAINS -> tags.any { it.contains(rule.value, ignoreCase = true) }
+            else -> false
+        }
+    }
+}

app/src/main/java/com/aryan/reader/epub/CalibreBundleExtractor.kt

@@ -0,0 +1,166 @@
+// CalibreBundleExtractor.kt
+package com.aryan.reader.epub
+
+import android.content.Context
+import android.graphics.BitmapFactory
+import android.net.Uri
+import androidx.core.net.toUri
+import com.aryan.reader.BookImporter
+import com.aryan.reader.FileType
+import com.aryan.reader.data.RecentFilesRepository
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.w3c.dom.Element
+import timber.log.Timber
+import java.io.ByteArrayInputStream
+import java.io.File
+import java.io.FileOutputStream
+import java.util.zip.ZipInputStream
+import javax.xml.parsers.DocumentBuilderFactory
+
+data class CalibreBundleResult(
+    val internalBookUri: Uri,
+    val type: FileType,
+    val title: String?,
+    val author: String?,
+    val description: String?,
+    val seriesName: String?,
+    val seriesIndex: Double?,
+    val coverCachePath: String?
+)
+
+object CalibreBundleExtractor {
+    suspend fun processZip(
+        context: Context,
+        zipUri: Uri,
+        bookId: String,
+        bookImporter: BookImporter,
+        recentFilesRepository: RecentFilesRepository
+    ): CalibreBundleResult? = withContext(Dispatchers.IO) {
+        var tempBookFile: File? = null
+        var extractedType: FileType? = null
+        var ext = ""
+        var opfData: String? = null
+        var coverBytes: ByteArray? = null
+
+        try {
+            context.contentResolver.openInputStream(zipUri)?.use { inputStream ->
+                val zis = ZipInputStream(inputStream)
+                var entry = zis.nextEntry
+                Timber.d("CalibreExtractor: Started reading zip entries from $zipUri")
+                while (entry != null) {
+                    val name = entry.name.lowercase()
+                    Timber.d("CalibreExtractor: Found zip entry: $name")
+                    if (!entry.isDirectory) {
+                        if (name.endsWith(".opf")) {
+                            opfData = String(zis.readBytes(), Charsets.UTF_8)
+                            Timber.d("CalibreExtractor: Extracted OPF data, length=${opfData?.length}")
+                        } else if (name == "cover.jpg" || name == "cover.jpeg" || name.endsWith(".jpg")) {
+                            // Prefer exact 'cover.jpg' but grab the first image as fallback
+                            if (coverBytes == null || name.startsWith("cover")) {
+                                coverBytes = zis.readBytes()
+                                Timber.d("CalibreExtractor: Extracted cover image from $name")
+                            }
+                        } else {
+                            val type = when {
+                                name.endsWith(".epub") -> FileType.EPUB
+                                name.endsWith(".mobi") || name.endsWith(".azw3") -> FileType.MOBI
+                                name.endsWith(".pdf") -> FileType.PDF
+                                name.endsWith(".fb2") -> FileType.FB2
+                                else -> null
+                            }
+                            if (type != null && tempBookFile == null) {
+                                extractedType = type
+                                ext = File(name).extension
+                                tempBookFile = File(context.cacheDir, "temp_bundle_${bookId}.$ext")
+                                FileOutputStream(tempBookFile!!).use { fos ->
+                                    zis.copyTo(fos)
+                                }
+                                Timber.d("CalibreExtractor: Extracted book file $name to temp file")
+                            }
+                        }
+                    }
+                    zis.closeEntry()
+                    entry = zis.nextEntry
+                }
+            }
+
+            Timber.d("CalibreExtractor: Finished parsing zip. tempBookFile exists=${tempBookFile != null}, opfData exists=${opfData != null}, extractedType=$extractedType")
+
+            if (tempBookFile != null && opfData != null && extractedType != null) {
+                val finalBookFile = bookImporter.createBookFile("$bookId.$ext")
+                tempBookFile!!.renameTo(finalBookFile)
+
+                var coverPath: String? = null
+                if (coverBytes != null) {
+                    val bitmap = BitmapFactory.decodeByteArray(coverBytes, 0, coverBytes!!.size)
+                    if (bitmap != null) {
+                        coverPath = recentFilesRepository.saveCoverToCache(bitmap, zipUri)
+                    }
+                }
+
+                var title: String? = null
+                var author: String? = null
+                var description: String? = null
+                var seriesName: String? = null
+                var seriesIndex: Double? = null
+
+                try {
+                    val factory = DocumentBuilderFactory.newInstance()
+                    val builder = factory.newDocumentBuilder()
+                    val document = builder.parse(ByteArrayInputStream(opfData!!.toByteArray(Charsets.UTF_8)))
+                    val metadataNodes = document.getElementsByTagName("metadata")
+                    Timber.d("CalibreExtractor: Parsed OPF XML. metadataNodes count: ${metadataNodes.length}")
+
+                    if (metadataNodes.length > 0) {
+                        val metadata = metadataNodes.item(0) as Element
+
+                        val titleNodes = metadata.getElementsByTagName("dc:title")
+                        Timber.d("CalibreExtractor: Found ${titleNodes.length} dc:title nodes")
+                        if (titleNodes.length > 0) title = titleNodes.item(0).textContent
+
+                        val authorNodes = metadata.getElementsByTagName("dc:creator")
+                        Timber.d("CalibreExtractor: Found ${authorNodes.length} dc:creator nodes")
+                        if (authorNodes.length > 0) author = authorNodes.item(0).textContent
+
+                        val descNodes = metadata.getElementsByTagName("dc:description")
+                        Timber.d("CalibreExtractor: Found ${descNodes.length} dc:description nodes")
+                        if (descNodes.length > 0) description = descNodes.item(0).textContent
+
+                        val metaNodes = metadata.getElementsByTagName("meta")
+                        Timber.d("CalibreExtractor: Found ${metaNodes.length} meta nodes")
+
+                        for (i in 0 until metaNodes.length) {
+                            val meta = metaNodes.item(i) as Element
+                            val nameAttr = meta.getAttribute("name")
+                            val contentAttr = meta.getAttribute("content")
+                            if (nameAttr == "calibre:series") seriesName = contentAttr
+                            if (nameAttr == "calibre:series_index") seriesIndex = contentAttr.toDoubleOrNull()
+                        }
+                    }
+                } catch (e: Exception) {
+                    Timber.e(e, "Failed to parse metadata.opf")
+                }
+
+                Timber.d("CalibreExtractor: Final extracted info - title=$title, author=$author, series=$seriesName, index=$seriesIndex")
+
+                return@withContext CalibreBundleResult(
+                    internalBookUri = finalBookFile.toUri(),
+                    type = extractedType!!,
+                    title = title,
+                    author = author,
+                    description = description,
+                    seriesName = seriesName,
+                    seriesIndex = seriesIndex,
+                    coverCachePath = coverPath
+                )
+            }
+
+        } catch (e: Exception) {
+            Timber.e(e, "Failed to process zip bundle")
+        } finally {
+            tempBookFile?.delete() // Cleanup if parsing failed midway
+        }
+        return@withContext null
+    }
+}

app/src/main/java/com/aryan/reader/epub/EpubBook.kt

@@ -46,5 +46,8 @@ data class EpubBook(
     val extractionBasePath: String = "",
     val css: Map<String, String> = emptyMap(),
     @Transient
-    val chaptersForPagination: List<EpubChapter> = chapters
+    val chaptersForPagination: List<EpubChapter> = chapters,
+    val seriesName: String? = null,
+    val seriesIndex: Double? = null,
+    val description: String? = null,
 )

app/src/main/java/com/aryan/reader/epub/EpubParser.kt

@@ -167,17 +167,14 @@ class EpubParser(private val context: Context) {
         bookId: String,
         shouldUseToc: Boolean = true,
         originalBookNameHint: String = "streamed_book",
-        parseContent: Boolean = true
+        parseContent: Boolean = true,
+        extractionDirOverride: File? = null
     ): EpubBook {
         return withContext(Dispatchers.IO) {
             Timber.d("Parsing EPUB input stream for bookId: $bookId")
 
-            val extractionDir = File(context.cacheDir, "imported_file_$bookId")
-
-            if (extractionDir.exists()) {
-                extractionDir.deleteRecursively()
-            }
-            extractionDir.mkdirs()
+            val extractionDir = extractionDirOverride?.let(ImportedFileCache::prepareDirectory)
+                ?: ImportedFileCache.prepareActiveBookDir(context, bookId)
 
             val tempFile = File.createTempFile("epub_stream", ".epub", context.cacheDir)
             val filesMap: Map<String, EpubFile>
@@ -244,6 +241,24 @@ class EpubParser(private val context: Context) {
         val metadataLanguage =
             document.metadata.selectFirstChildTag("dc:language")?.textContent ?: "en"
         val metadataCoverId = getMetadataCoverId(document.metadata)
+        val metadataDescription =
+            document.metadata.selectFirstChildTag("dc:description")?.textContent
+
+        Timber.d("EpubParser: Extracted OPF metadata: title='$metadataTitle', author='$metadataAuthor'")
+
+        var metadataSeriesName: String? = null
+        var metadataSeriesIndex: Double? = null
+
+        document.metadata.selectChildTag("meta")
+            .ifEmpty { document.metadata.selectChildTag("opf:meta") }
+            .forEach { meta ->
+                val nameAttr = meta.getAttributeValue("name")
+                val contentAttr = meta.getAttributeValue("content")
+
+                if (nameAttr == "calibre:series") metadataSeriesName = contentAttr
+                if (nameAttr == "calibre:series_index") metadataSeriesIndex = contentAttr?.toDoubleOrNull()
+            }
+
         val opfRelativePath = document.opfFilePath
         val opfParentDir = File(opfRelativePath).parentFile ?: File("")
         val manifestItems = getManifestItems(document.manifest, opfParentDir)
@@ -344,7 +359,10 @@ class EpubParser(private val context: Context) {
             pageList = pageTargets,
             tableOfContents = tableOfContents,
             extractionBasePath = extractionBasePath,
-            css = cssContent
+            css = cssContent,
+            seriesName = metadataSeriesName,
+            seriesIndex = metadataSeriesIndex,
+            description = metadataDescription
         )
     }
 
@@ -688,4 +706,4 @@ class EpubParser(private val context: Context) {
                 lowerName.endsWith(".htm") ||
                 lowerName.endsWith(".css")
     }
-}
+}

app/src/main/java/com/aryan/reader/epub/Fb2Parser.kt

@@ -20,13 +20,11 @@ class Fb2Parser(private val context: Context) {
         inputStream: InputStream,
         bookId: String,
         originalBookNameHint: String,
-        parseContent: Boolean = true
+        parseContent: Boolean = true,
+        extractionDirOverride: File? = null
     ): EpubBook = withContext(Dispatchers.IO) {
-        File(context.cacheDir, "imported_file_$bookId").deleteRecursively()
-
-        val extractionDir = File(context.cacheDir, "imported_file_$bookId").apply {
-            if (!exists()) mkdirs()
-        }
+        val extractionDir = extractionDirOverride?.let(ImportedFileCache::prepareDirectory)
+            ?: ImportedFileCache.prepareActiveBookDir(context, bookId)
 
         var streamToParse = inputStream
         try {
@@ -324,4 +322,4 @@ class Fb2Parser(private val context: Context) {
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/epub/ImportedFileCache.kt

@@ -0,0 +1,81 @@
+package com.aryan.reader.epub
+
+import android.content.Context
+import java.io.File
+import java.util.UUID
+
+object ImportedFileCache {
+    private const val ACTIVE_PREFIX = "imported_file_"
+    private const val TEMP_PREFIX = "imported_file_tmp_"
+    private val invalidSegmentChars = Regex("[^A-Za-z0-9._-]+")
+
+    fun activeBookDir(context: Context, bookId: String): File {
+        return File(context.cacheDir, "$ACTIVE_PREFIX$bookId")
+    }
+
+    fun prepareActiveBookDir(context: Context, bookId: String): File {
+        return prepareDirectory(activeBookDir(context, bookId))
+    }
+
+    fun createTemporaryBookDir(context: Context, bookId: String, purpose: String): File {
+        val dirName = buildString {
+            append(TEMP_PREFIX)
+            append(purpose.toCacheSegment())
+            append('_')
+            append(bookMarker(bookId))
+            append('_')
+            append(UUID.randomUUID())
+        }
+        return prepareDirectory(File(context.cacheDir, dirName))
+    }
+
+    fun prepareDirectory(directory: File): File {
+        if (directory.exists()) {
+            directory.deleteRecursively()
+        }
+        directory.mkdirs()
+        return directory
+    }
+
+    fun clearBookCache(context: Context, bookId: String) {
+        activeBookDir(context, bookId).takeIf { it.exists() }?.deleteRecursively()
+        clearTemporaryBookDirs(context, bookId)
+    }
+
+    fun clearTemporaryBookDirs(context: Context, bookId: String) {
+        val marker = "_${bookMarker(bookId)}_"
+        context.cacheDir.listFiles()?.forEach { file ->
+            if (isTemporaryBookDir(file.name) && file.name.contains(marker)) {
+                file.deleteRecursively()
+            }
+        }
+    }
+
+    fun deleteStaleTemporaryBookDirs(
+        context: Context,
+        olderThanMillis: Long,
+        nowMillis: Long = System.currentTimeMillis()
+    ) {
+        context.cacheDir.listFiles()?.forEach { file ->
+            if (isTemporaryBookDir(file.name) && nowMillis - file.lastModified() >= olderThanMillis) {
+                file.deleteRecursively()
+            }
+        }
+    }
+
+    fun isTemporaryBookDir(name: String): Boolean = name.startsWith(TEMP_PREFIX)
+
+    fun isActiveBookDir(name: String): Boolean {
+        return name.startsWith(ACTIVE_PREFIX) && !isTemporaryBookDir(name)
+    }
+
+    private fun bookMarker(bookId: String): String {
+        val normalized = bookId.toCacheSegment().ifBlank { "book" }.take(40)
+        val hash = bookId.hashCode().toLong() and 0xffffffffL
+        return "${normalized}_${hash.toString(16)}"
+    }
+
+    private fun String.toCacheSegment(): String {
+        return replace(invalidSegmentChars, "_").trim('_')
+    }
+}

app/src/main/java/com/aryan/reader/epub/MobiParser.kt

@@ -109,27 +109,18 @@ class MobiParser(private val context: Context) {
     private external fun parseMobiFile(filePath: String): ParsedMobiData?
 
     companion object {
-        const val EXTRACTED_EPUB_DIR_NAME = "extracted_epubs"
-
         init {
             System.loadLibrary("mobi")
             System.loadLibrary("native-lib")
         }
     }
 
-    private fun getBookExtractionDir(bookIdentifier: String): File {
-        val parentDir = File(context.cacheDir, EXTRACTED_EPUB_DIR_NAME)
-        if (!parentDir.exists()) {
-            parentDir.mkdirs()
-        }
-        return File(parentDir, bookIdentifier)
-    }
-
     suspend fun createMobiBook(
         inputStream: InputStream,
         bookId: String,
         originalBookNameHint: String,
-        parseContent: Boolean = true
+        parseContent: Boolean = true,
+        extractionDirOverride: File? = null
     ): EpubBook? = withContext(Dispatchers.IO) {
         val tempFile = File.createTempFile("temp_mobi_", ".mobi", context.cacheDir)
         try {
@@ -162,8 +153,8 @@ class MobiParser(private val context: Context) {
         val bookTitle = parsedData.title ?: originalBookNameHint
         val bookAuthor = parsedData.author ?: "Unknown Author"
 
-        val extractionDir = File(context.cacheDir, "imported_file_$bookId")
-        extractionDir.mkdirs()
+        val extractionDir = extractionDirOverride?.let(ImportedFileCache::prepareDirectory)
+            ?: ImportedFileCache.prepareActiveBookDir(context, bookId)
 
         val sequentialImageMap = parsedData.resources
             .filter { it.mediaType.startsWith("image/") }
@@ -314,4 +305,4 @@ class MobiParser(private val context: Context) {
         Timber.d("Final EpubBook created. CSS map size: ${finalBook.css.size}, Image count: ${finalBook.images.size}")
         return@withContext finalBook
     }
-}
+}

app/src/main/java/com/aryan/reader/epub/OdtParser.kt

@@ -29,12 +29,11 @@ class OdtParser(private val context: Context) {
         bookId: String,
         originalBookNameHint: String,
         isFlat: Boolean,
-        parseContent: Boolean = true
+        parseContent: Boolean = true,
+        extractionDirOverride: File? = null
     ): EpubBook = withContext(Dispatchers.IO) {
-        File(context.cacheDir, "imported_file_$bookId").deleteRecursively()
-        val extractionDir = File(context.cacheDir, "imported_file_$bookId").apply {
-            if (!exists()) mkdirs()
-        }
+        val extractionDir = extractionDirOverride?.let(ImportedFileCache::prepareDirectory)
+            ?: ImportedFileCache.prepareActiveBookDir(context, bookId)
 
         val mathJaxFileName = "tex-mml-chtml.js"
         val mathJaxFile = File(extractionDir, mathJaxFileName)
@@ -427,4 +426,4 @@ class OdtParser(private val context: Context) {
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/epub/SingleFileImporter.kt

@@ -41,11 +41,17 @@ import java.io.File
 import java.io.FileOutputStream
 import java.io.InputStream
 import java.util.UUID
+import java.util.zip.ZipFile
 
 class SingleFileImporter(private val context: Context) {
 
     private val jsonSerializer = Json { ignoreUnknownKeys = true; encodeDefaults = true }
 
+    companion object {
+        private const val MAX_DOCX_ARCHIVE_BYTES = 64L * 1024L * 1024L
+        private const val MAX_DOCX_XML_BYTES = 48L * 1024L * 1024L
+    }
+
     suspend fun importSingleFile(
         inputStream: InputStream,
         type: FileType,
@@ -104,14 +110,19 @@ class SingleFileImporter(private val context: Context) {
                             var inQuotes = false
 
                             for (char in line) {
-                                if (char == '\"') {
-                                    inQuotes = !inQuotes
-                                } else if (char == delimiter && !inQuotes) {
-                                    val escaped = current.toString().replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
-                                    writer.write("<td>$escaped</td>")
-                                    current.clear()
-                                } else {
-                                    current.append(char)
+                                when (char) {
+                                    '\"' -> {
+                                        inQuotes = !inQuotes
+                                    }
+                                    delimiter if !inQuotes -> {
+                                        val escaped =
+                                            current.toString().replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
+                                        writer.write("<td>$escaped</td>")
+                                        current.clear()
+                                    }
+                                    else -> {
+                                        current.append(char)
+                                    }
                                 }
                             }
                             val escapedFinal = current.toString().replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
@@ -663,15 +674,29 @@ class SingleFileImporter(private val context: Context) {
         val parseStart = System.currentTimeMillis()
         Timber.tag("FileOpenPerf").d("[DOCX] parseDocx START | file=$originalBookNameHint")
 
-        val htmlContent = inputStream.use { stream ->
-            val converter = DocumentConverter()
-            converter.convertToHtml(stream).value ?: ""
-        }
-
-        Timber.tag("FileOpenPerf").d("[DOCX] parseDocx: mammoth conversion done | elapsed=${System.currentTimeMillis() - parseStart}ms")
-
+        val sourceDocxFile = File(context.cacheDir, "temp_docx_source_${UUID.randomUUID()}.docx")
         val tempFile = File(context.cacheDir, "temp_docx_${UUID.randomUUID()}.html")
         try {
+            inputStream.use { stream ->
+                FileOutputStream(sourceDocxFile).use { output ->
+                    stream.copyTo(output)
+                }
+            }
+
+            validateDocxForImport(sourceDocxFile, originalBookNameHint)
+
+            val htmlContent = sourceDocxFile.inputStream().use { stream ->
+                try {
+                    val converter = DocumentConverter()
+                    converter.convertToHtml(stream).value ?: ""
+                } catch (oom: OutOfMemoryError) {
+                    Timber.e(oom, "DOCX conversion ran out of memory for $originalBookNameHint")
+                    throw IllegalStateException("This DOCX file is too large to open safely on this device.")
+                }
+            }
+
+            Timber.tag("FileOpenPerf").d("[DOCX] parseDocx: mammoth conversion done | elapsed=${System.currentTimeMillis() - parseStart}ms")
+
             FileOutputStream(tempFile).bufferedWriter().use { writer ->
                 val title = originalBookNameHint.substringBeforeLast(".")
                 writer.write("<!DOCTYPE html>\n<html>\n<head>\n<title>$title</title>\n</head>\n<body>\n")
@@ -683,12 +708,41 @@ class SingleFileImporter(private val context: Context) {
                 return@withContext parseHtml(tempStream, originalBookNameHint, bookId, parseContent)
             }
         } finally {
+            if (sourceDocxFile.exists()) {
+                sourceDocxFile.delete()
+            }
             if (tempFile.exists()) {
                 tempFile.delete()
             }
         }
     }
 
+    private fun validateDocxForImport(sourceDocxFile: File, originalBookNameHint: String) {
+        val archiveBytes = sourceDocxFile.length()
+        if (archiveBytes > MAX_DOCX_ARCHIVE_BYTES) {
+            throw IllegalStateException("This DOCX file is too large to open safely on this device.")
+        }
+
+        ZipFile(sourceDocxFile).use { zip ->
+            var totalXmlBytes = 0L
+            val entries = zip.entries()
+            while (entries.hasMoreElements()) {
+                val entry = entries.nextElement()
+                if (entry.isDirectory) continue
+                if (entry.name.endsWith(".xml", ignoreCase = true)) {
+                    val entrySize = entry.size
+                    if (entrySize > 0) {
+                        totalXmlBytes += entrySize
+                    }
+                    if (totalXmlBytes > MAX_DOCX_XML_BYTES) {
+                        Timber.w("DOCX XML payload too large for import: file=$originalBookNameHint xmlBytes=$totalXmlBytes")
+                        throw IllegalStateException("This DOCX file is too large to open safely on this device.")
+                    }
+                }
+            }
+        }
+    }
+
     private fun writeHtmlChapter(
         extractionDir: File,
         bookId: String,
@@ -718,4 +772,4 @@ class SingleFileImporter(private val context: Context) {
             isInToc = true
         )
     }
-}
+}

app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt

@@ -92,6 +92,8 @@ import java.io.BufferedReader
 import java.io.ByteArrayOutputStream
 import java.io.InputStreamReader
 
+private const val TAG_LINK_NAV = "LINK_NAV"
+
 private fun getFontCssInjection(): String {
     return """
         @font-face { font-family: 'Merriweather'; src: url('file:///android_asset/fonts/merriweather.ttf'); }
@@ -313,6 +315,17 @@ class FootnoteJsBridge(
     }
 }
 
+@Suppress("unused")
+class LinkNavJsBridge(
+    private val currentChapterTitle: String
+) {
+    @JavascriptInterface
+    fun onLinkClicked(href: String, epubType: String, linkText: String) {
+        Timber.tag(TAG_LINK_NAV)
+            .d("[JS-CLICK] href='$href', epub:type='$epubType', label='$linkText' | currentChapter='$currentChapterTitle'")
+    }
+}
+
 @SuppressLint("SetJavaScriptEnabled")
 @Composable
 fun ChapterWebView(
@@ -336,6 +349,8 @@ fun ChapterWebView(
     currentFontSize: Float,
     currentLineHeight: Float,
     currentParagraphGap: Float,
+    currentImageSize: Float,
+    currentHorizontalMargin: Float,
     onChapterInitiallyScrolled: () -> Unit,
     modifier: Modifier = Modifier,
     onTap: () -> Unit,
@@ -370,6 +385,7 @@ fun ChapterWebView(
     onAutoScrollChapterEnd: () -> Unit = {},
     activeHighlightPalette: List<HighlightColor>,
     onUpdatePalette: (Int, HighlightColor) -> Unit,
+    onInternalLinkClick: (String) -> Unit,
     activeTextureId: String? = null
 ) {
     Timber.d(
@@ -471,6 +487,8 @@ fun ChapterWebView(
             currentFontSize,
             currentLineHeight,
             currentParagraphGap,
+            currentImageSize,
+            currentHorizontalMargin,
             currentFontFamily,
             currentTextAlign
         ) {
@@ -550,6 +568,11 @@ fun ChapterWebView(
                             consoleMessage?.let {
                                 val message = it.message()
                                 when {
+                                    message.startsWith("LINK_NAV:") -> {
+                                        Timber.tag(TAG_LINK_NAV)
+                                            .d("JS -> ${message.substringAfter("LINK_NAV: ")}")
+                                    }
+
                                     message.startsWith("FootnoteDiag:") -> {
                                         Timber.tag("FootnoteDiag")
                                             .d("JS -> ${message.substringAfter("FootnoteDiag: ")}")
@@ -653,16 +676,31 @@ fun ChapterWebView(
                         }, "FootnoteBridge"
                     )
 
+                    addJavascriptInterface(
+                        LinkNavJsBridge(chapterTitle), "LinkNavBridge"
+                    )
+
                     webViewClient = object : WebViewClient() {
                         override fun shouldOverrideUrlLoading(
                             view: WebView?, request: WebResourceRequest?
                         ): Boolean {
                             val url = request?.url?.toString()
                             if (url != null && (url.startsWith("http://") || url.startsWith("https://"))) {
-                                Timber.d("Intercepted external link: $url")
+                                Timber.tag(TAG_LINK_NAV)
+                                    .d("[EXTERNAL-INTERCEPT] url='$url' from chapter '$chapterTitle'")
                                 showExternalLinkDialog = url
                                 return true
                             }
+                            if (url != null && url.startsWith("file://")) {
+                                Timber.tag(TAG_LINK_NAV)
+                                    .d("[INTERNAL-LINK-INTERCEPTED] url='$url' from chapter '$chapterTitle'")
+                                onInternalLinkClick(url)
+                                return true
+                            }
+                            if (url != null) {
+                                Timber.tag(TAG_LINK_NAV)
+                                    .d("[INTERNAL-LINK-PASSED] url='$url' from chapter '$chapterTitle' — allowing WebView to handle")
+                            }
                             return false
                         }
 
@@ -744,7 +782,7 @@ fun ChapterWebView(
                             }
 
                             view?.evaluateJavascript(
-                                "javascript:window.updateReaderStyles($currentFontSize, $currentLineHeight, '$fontNameForJs', '${currentTextAlign.cssValue}', $currentParagraphGap);",
+                                "javascript:window.updateReaderStyles($currentFontSize, $currentLineHeight, '$fontNameForJs', '${currentTextAlign.cssValue}', $currentParagraphGap, $currentImageSize, $currentHorizontalMargin);",
                                 null
                             )
 
@@ -768,10 +806,59 @@ fun ChapterWebView(
                                 }
                             } else if (!initialFragmentId.isNullOrBlank()) {
                                 Timber.tag("NavDiag").d("WebView onPageFinished: Scrolling to Element ID: $initialFragmentId")
-                                view?.evaluateJavascript(
-                                    "javascript:var el = document.getElementById('$initialFragmentId'); if(el) { el.scrollIntoView(); } else { console.log('Element not found: $initialFragmentId'); }",
-                                    null
-                                )
+                                val js = """
+                                    (function() {
+                                        var targetId = '$initialFragmentId';
+                                        var el = document.getElementById(targetId) || document.querySelector('[name="' + targetId + '"]');
+                                        if (el) {
+                                            var targetScrollY = window.scrollY + el.getBoundingClientRect().top - (window.VIEWPORT_PADDING_TOP + 10);
+                                            window.scrollTo({ top: targetScrollY, behavior: 'auto' });
+                                            return -2;
+                                        }
+                                        if (window.virtualization && window.virtualization.chunksData) {
+                                            for (var i = 0; i < window.virtualization.chunksData.length; i++) {
+                                                var chunkHtml = window.virtualization.chunksData[i];
+                                                if (chunkHtml && (chunkHtml.indexOf('id="' + targetId + '"') !== -1 || chunkHtml.indexOf('name="' + targetId + '"') !== -1 || chunkHtml.indexOf("id='" + targetId + "'") !== -1 || chunkHtml.indexOf("name='" + targetId + "'") !== -1)) {
+                                                    return i;
+                                                }
+                                            }
+                                        }
+                                        return -1;
+                                    })()
+                                """.trimIndent()
+
+                                view?.evaluateJavascript(js) { result ->
+                                    val chunkIdx = result?.toIntOrNull() ?: -1
+                                    if (chunkIdx >= 0) {
+                                        for (i in 0..chunkIdx) {
+                                            onChunkRequested(i)
+                                        }
+                                        val scrollJs = """
+                                            (function() {
+                                                var chunkIndex = $chunkIdx;
+                                                var fragmentId = '$initialFragmentId';
+                                                setTimeout(function() {
+                                                    var chunkDiv = document.querySelector('.chunk-container[data-chunk-index="' + chunkIndex + '"]');
+                                                    if (chunkDiv && chunkDiv.innerHTML === "" && window.virtualization && window.virtualization.chunksData[chunkIndex]) {
+                                                        chunkDiv.innerHTML = window.virtualization.chunksData[chunkIndex];
+                                                        chunkDiv.style.height = "";
+                                                    }
+                                                    setTimeout(function() {
+                                                        var el = document.getElementById(fragmentId) || document.querySelector('[name="' + fragmentId + '"]');
+                                                        if (el) {
+                                                            var targetScrollY = window.scrollY + el.getBoundingClientRect().top - (window.VIEWPORT_PADDING_TOP + 10);
+                                                            window.scrollTo({ top: targetScrollY, behavior: 'auto' });
+                                                        } else if (chunkDiv) {
+                                                            var targetScrollY = window.scrollY + chunkDiv.getBoundingClientRect().top - window.VIEWPORT_PADDING_TOP;
+                                                            window.scrollTo({ top: targetScrollY, behavior: 'auto' });
+                                                        }
+                                                    }, 50);
+                                                }, 200);
+                                            })()
+                                        """.trimIndent()
+                                        view.evaluateJavascript(scrollJs, null)
+                                    }
+                                }
                                 onChapterInitiallyScrolled()
                                 scrollActionTaken = true
                             } else if (initialScrollTarget != null) {
@@ -859,7 +946,7 @@ fun ChapterWebView(
                 )
 
                 webView.evaluateJavascript(
-                    "javascript:window.updateReaderStyles($currentFontSize, $currentLineHeight, '$fontNameForJs', '${currentTextAlign.cssValue}', $currentParagraphGap);",
+                    "javascript:window.updateReaderStyles($currentFontSize, $currentLineHeight, '$fontNameForJs', '${currentTextAlign.cssValue}', $currentParagraphGap, $currentImageSize, $currentHorizontalMargin);",
                     null
                 )
 
@@ -1075,4 +1162,4 @@ fun ChapterWebView(
                 })
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt

@@ -1378,6 +1378,7 @@ fun TtsOverlayControls(
     currentTtsMode: com.aryan.reader.tts.TtsPlaybackManager.TtsMode,
     isCollapsed: Boolean,
     onCollapseChange: (Boolean) -> Unit,
+    onLocateCurrentChunk: () -> Unit,
     onOpenTtsSettings: () -> Unit,
     onClose: () -> Unit,
     modifier: Modifier = Modifier,
@@ -1504,6 +1505,14 @@ fun TtsOverlayControls(
                         }
 
                         Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
+                            IconButton(onClick = onLocateCurrentChunk, modifier = Modifier.size(32.dp)) {
+                                Icon(
+                                    painterResource(R.drawable.pin_drop),
+                                    "Locate current chunk",
+                                    modifier = Modifier.size(18.dp),
+                                    tint = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                            }
                             IconButton(onClick = { onCollapseChange(true) }, modifier = Modifier.size(32.dp)) {
                                 Icon(Icons.Default.ChevronRight, "Collapse", modifier = Modifier.size(18.dp), tint = MaterialTheme.colorScheme.onSurfaceVariant)
                             }
@@ -1589,4 +1598,4 @@ fun TtsOverlayControls(
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/epubreader/EpubReaderSettings.kt

@@ -24,17 +24,7 @@ import android.net.Uri
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.slideInVertically
-import androidx.compose.animation.slideOutVertically
-import androidx.compose.foundation.BorderStroke
-import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.background
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -42,69 +32,88 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.gestures.awaitEachGesture
+import androidx.compose.foundation.gestures.awaitFirstDown
+import androidx.compose.foundation.gestures.drag
+import androidx.compose.ui.geometry.CornerRadius
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Remove
 import androidx.compose.material3.Button
 import androidx.compose.material3.DropdownMenu
 import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.ListItem
 import androidx.compose.material3.ListItemDefaults
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
 import androidx.compose.material3.Slider
 import androidx.compose.material3.Surface
+import androidx.compose.material3.Switch
 import androidx.compose.material3.Tab
 import androidx.compose.material3.TabRow
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.Font
 import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.core.content.edit
 import com.aryan.reader.R
 import com.aryan.reader.data.CustomFontEntity
 import java.io.File
-import androidx.compose.material3.Switch
-import androidx.compose.material3.ModalBottomSheet
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.rememberModalBottomSheetState
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.navigationBars
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.res.stringResource
+import kotlin.math.roundToInt
 
 const val SETTINGS_PREFS_NAME = "epub_reader_settings"
 private const val TEXT_ALIGN_KEY = "reader_text_align"
 private const val FONT_SIZE_KEY = "reader_font_size"
 private const val LINE_HEIGHT_KEY = "reader_line_height"
 private const val PARAGRAPH_GAP_KEY = "reader_paragraph_gap"
+private const val IMAGE_SIZE_KEY = "reader_image_size"
 private const val AUTO_SCROLL_SPEED_KEY = "reader_auto_scroll_speed"
 private const val FONT_FAMILY_KEY = "reader_font_family"
 private const val TAP_TO_NAVIGATE_ENABLED_KEY = "tap_to_navigate_enabled"
@@ -116,6 +125,8 @@ private const val PULL_TO_TURN_ENABLED_KEY = "reader_pull_to_turn_enabled"
 const val DEFAULT_FONT_SIZE_VAL = 1.0f
 const val DEFAULT_LINE_HEIGHT_VAL = 1.0f
 const val DEFAULT_PARAGRAPH_GAP_VAL = 1.0f
+const val DEFAULT_IMAGE_SIZE_VAL = 1.0f
+const val DEFAULT_HORIZONTAL_MARGIN_VAL = 1.0f
 private const val TTS_SPEECH_RATE_KEY = "tts_speech_rate"
 private const val TTS_PITCH_KEY = "tts_pitch"
 
@@ -170,6 +181,8 @@ data class FormatSettings(
     val fontSize: Float,
     val lineHeight: Float,
     val paragraphGap: Float,
+    val imageSize: Float,
+    val horizontalMargin: Float,
     val font: ReaderFont,
     val customPath: String?,
     val textAlign: ReaderTextAlign
@@ -179,8 +192,11 @@ private const val FORMAT_IS_LOCAL_PREFIX = "format_is_local_"
 private const val LOCAL_FONT_SIZE_PREFIX = "local_font_size_"
 private const val LOCAL_LINE_HEIGHT_PREFIX = "local_line_height_"
 private const val LOCAL_PARAGRAPH_GAP_PREFIX = "local_paragraph_gap_"
+private const val LOCAL_IMAGE_SIZE_PREFIX = "local_image_size_"
+private const val LOCAL_HORIZONTAL_MARGIN_PREFIX = "local_horizontal_margin_"
 private const val LOCAL_FONT_FAMILY_PREFIX = "local_font_family_"
 private const val LOCAL_TEXT_ALIGN_PREFIX = "local_text_align_"
+private const val HORIZONTAL_MARGIN_KEY = "reader_horizontal_margin"
 
 fun loadFormatIsLocal(context: Context, bookId: String): Boolean {
     val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
@@ -198,6 +214,8 @@ fun saveLocalReaderSettings(
     fontSize: Float,
     lineHeight: Float,
     paragraphGap: Float,
+    imageSize: Float,
+    horizontalMargin: Float,
     fontFamily: ReaderFont,
     customFontPath: String?,
     textAlign: ReaderTextAlign
@@ -207,6 +225,8 @@ fun saveLocalReaderSettings(
         putFloat(LOCAL_FONT_SIZE_PREFIX + bookId, fontSize)
         putFloat(LOCAL_LINE_HEIGHT_PREFIX + bookId, lineHeight)
         putFloat(LOCAL_PARAGRAPH_GAP_PREFIX + bookId, paragraphGap)
+        putFloat(LOCAL_IMAGE_SIZE_PREFIX + bookId, imageSize)
+        putFloat(LOCAL_HORIZONTAL_MARGIN_PREFIX + bookId, horizontalMargin)
         if (customFontPath != null) {
             putString(LOCAL_FONT_FAMILY_PREFIX + bookId, "custom|$customFontPath")
         } else {
@@ -260,6 +280,14 @@ fun loadPullToTurnMultiplier(context: Context): Float {
     return prefs.getFloat(PULL_TO_TURN_MULTIPLIER_KEY, 1.0f)
 }
 
+fun loadHorizontalMargin(context: Context): Float {
+    val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
+    if (prefs.contains(HORIZONTAL_MARGIN_KEY)) {
+        return prefs.getFloat(HORIZONTAL_MARGIN_KEY, DEFAULT_HORIZONTAL_MARGIN_VAL)
+    }
+    return if (loadRemoveEdgePadding(context)) 0f else DEFAULT_HORIZONTAL_MARGIN_VAL
+}
+
 fun loadFormatSettings(context: Context, bookId: String, isLocal: Boolean): FormatSettings {
     val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
 
@@ -281,6 +309,18 @@ fun loadFormatSettings(context: Context, bookId: String, isLocal: Boolean): Form
         prefs.getFloat(PARAGRAPH_GAP_KEY, DEFAULT_PARAGRAPH_GAP_VAL)
     }
 
+    val imageSize = if (isLocal && prefs.contains(LOCAL_IMAGE_SIZE_PREFIX + bookId)) {
+        prefs.getFloat(LOCAL_IMAGE_SIZE_PREFIX + bookId, DEFAULT_IMAGE_SIZE_VAL)
+    } else {
+        prefs.getFloat(IMAGE_SIZE_KEY, DEFAULT_IMAGE_SIZE_VAL)
+    }
+
+    val horizontalMargin = if (isLocal && prefs.contains(LOCAL_HORIZONTAL_MARGIN_PREFIX + bookId)) {
+        prefs.getFloat(LOCAL_HORIZONTAL_MARGIN_PREFIX + bookId, DEFAULT_HORIZONTAL_MARGIN_VAL)
+    } else {
+        loadHorizontalMargin(context)
+    }
+
     val savedFontVal = if (isLocal && prefs.contains(LOCAL_FONT_FAMILY_PREFIX + bookId)) {
         prefs.getString(LOCAL_FONT_FAMILY_PREFIX + bookId, ReaderFont.ORIGINAL.id) ?: ReaderFont.ORIGINAL.id
     } else {
@@ -300,7 +340,16 @@ fun loadFormatSettings(context: Context, bookId: String, isLocal: Boolean): Form
     }
     val textAlign = ReaderTextAlign.entries.find { it.id == alignId } ?: ReaderTextAlign.DEFAULT
 
-    return FormatSettings(fontSize, lineHeight, paragraphGap, font, customPath, textAlign)
+    return FormatSettings(
+        fontSize = fontSize,
+        lineHeight = lineHeight,
+        paragraphGap = paragraphGap,
+        imageSize = imageSize,
+        horizontalMargin = horizontalMargin,
+        font = font,
+        customPath = customPath,
+        textAlign = textAlign
+    )
 }
 
 fun getComposeFontFamily(
@@ -339,6 +388,8 @@ fun saveReaderSettings(
     fontSize: Float,
     lineHeight: Float,
     paragraphGap: Float,
+    imageSize: Float,
+    horizontalMargin: Float,
     fontFamily: ReaderFont,
     customFontPath: String?,
     textAlign: ReaderTextAlign
@@ -348,6 +399,8 @@ fun saveReaderSettings(
         putFloat(FONT_SIZE_KEY, fontSize)
         putFloat(LINE_HEIGHT_KEY, lineHeight)
         putFloat(PARAGRAPH_GAP_KEY, paragraphGap)
+        putFloat(IMAGE_SIZE_KEY, imageSize)
+        putFloat(HORIZONTAL_MARGIN_KEY, horizontalMargin)
         if (customFontPath != null) {
             putString(FONT_FAMILY_KEY, "custom|$customFontPath")
         } else {
@@ -387,6 +440,7 @@ fun loadVolumeScrollSetting(context: Context): Boolean {
     return prefs.getBoolean(VOLUME_SCROLL_ENABLED_KEY, false)
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ReaderTextFormatPanel(
     isVisible: Boolean,
@@ -394,8 +448,12 @@ fun ReaderTextFormatPanel(
     onFontSizeChange: (Float) -> Unit,
     currentLineHeight: Float,
     onLineHeightChange: (Float) -> Unit,
-    currentParagraphGap: Float, // NEW
-    onParagraphGapChange: (Float) -> Unit, // NEW
+    currentParagraphGap: Float,
+    onParagraphGapChange: (Float) -> Unit,
+    currentImageSize: Float,
+    onImageSizeChange: (Float) -> Unit,
+    currentHorizontalMargin: Float,
+    onHorizontalMarginChange: (Float) -> Unit,
     currentFont: ReaderFont,
     currentCustomFontName: String?,
     onFontOptionClick: () -> Unit,
@@ -404,27 +462,28 @@ fun ReaderTextFormatPanel(
     onReset: () -> Unit,
     isLocalMode: Boolean,
     onLocalModeToggle: (Boolean) -> Unit,
-    onClose: () -> Unit,
-    modifier: Modifier = Modifier
+    onClose: () -> Unit
 ) {
-    AnimatedVisibility(
-        visible = isVisible,
-        enter = slideInVertically { it } + fadeIn(),
-        exit = slideOutVertically { it } + fadeOut(),
-        modifier = modifier
-    ) {
-        Surface(
-            shape = RoundedCornerShape(topStart = 28.dp, topEnd = 28.dp),
-            color = MaterialTheme.colorScheme.surfaceContainerHigh.copy(alpha = 0.98f),
-            tonalElevation = 0.dp,
-            shadowElevation = 8.dp,
-            border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.8f)),
-            modifier = Modifier
-                .fillMaxWidth()
-                .animateContentSize()
+    if (isVisible) {
+        val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+
+        ModalBottomSheet(
+            onDismissRequest = onClose,
+            sheetState = sheetState,
+            scrimColor = Color.Transparent,
+            containerColor = MaterialTheme.colorScheme.surfaceContainerHigh.copy(alpha = 0.9f),
+            contentWindowInsets = { WindowInsets.navigationBars }
         ) {
+            val configuration = LocalConfiguration.current
+            val maxSheetHeight = (configuration.screenHeightDp * 0.7f).dp
+
             Column(
-                modifier = Modifier.padding(16.dp)
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .heightIn(max = maxSheetHeight)
+                    .verticalScroll(rememberScrollState())
+                    .padding(horizontal = 16.dp, vertical = 8.dp)
+                    .padding(bottom = 24.dp)
             ) {
                 // Header Row (Local/Global + Close/Reset)
                 Row(
@@ -500,7 +559,7 @@ fun ReaderTextFormatPanel(
                     modifier = Modifier.padding(start = 4.dp, bottom = 8.dp)
                 )
 
-                // Font Button (Full width)
+                // Font Button
                 Surface(
                     onClick = onFontOptionClick,
                     shape = RoundedCornerShape(12.dp),
@@ -540,7 +599,7 @@ fun ReaderTextFormatPanel(
 
                 Spacer(Modifier.height(8.dp))
 
-                // Alignment Button (Full width Segmented)
+                // Alignment Button (Segmented)
                 Surface(
                     shape = RoundedCornerShape(12.dp),
                     color = MaterialTheme.colorScheme.surfaceVariant,
@@ -586,49 +645,61 @@ fun ReaderTextFormatPanel(
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.primary,
                     fontWeight = FontWeight.Bold,
-                    modifier = Modifier.padding(start = 4.dp, bottom = 8.dp)
+                    modifier = Modifier.padding(start = 4.dp, bottom = 12.dp)
                 )
 
-                // Sliders
-                Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
-                    // Size
-                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                        Text(stringResource(R.string.label_font_size), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
-                        Slider(
-                            value = currentFontSize,
-                            onValueChange = onFontSizeChange,
-                            valueRange = 0.5f..3.0f,
-                            steps = 24,
-                            modifier = Modifier.weight(1f)
-                        )
-                        Text(if (currentFontSize in 0.99f..1.01f) stringResource(R.string.label_original) else "%.1fx".format(currentFontSize), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
-                    }
-                    // Lines
-                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                        Text(stringResource(R.string.label_line_height), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
-                        Slider(
-                            value = currentLineHeight,
-                            onValueChange = onLineHeightChange,
-                            valueRange = 1.0f..3.0f,
-                            steps = 19,
-                            modifier = Modifier.weight(1f)
-                        )
-                        Text(if (currentLineHeight <= 1.01f) stringResource(R.string.label_original) else "%.1fx".format(currentLineHeight), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
-                    }
-                    // Paragraph Gap
-                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                        Text(stringResource(R.string.label_paragraph_gap), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
-                        Slider(
-                            value = currentParagraphGap,
-                            onValueChange = onParagraphGapChange,
-                            valueRange = 0.0f..3.0f,
-                            steps = 29,
-                            modifier = Modifier.weight(1f)
-                        )
-                        Text(if (currentParagraphGap in 0.99f..1.01f) stringResource(R.string.label_original) else "%.1fx".format(currentParagraphGap), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
-                    }
+                // Resolve the string once outside the lambdas
+                val originalLabel = stringResource(R.string.label_original)
+                val noneLabel = stringResource(R.string.label_none)
+
+                // Wide, smooth sliders without dots
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    FormatSlider(
+                        label = stringResource(R.string.label_font_size),
+                        value = currentFontSize,
+                        onValueChange = onFontSizeChange,
+                        valueRange = 0.5f..3.0f,
+                        formatValue = { if (it in 0.99f..1.01f) originalLabel else "%.1fx".format(it) }
+                    )
+
+                    FormatSlider(
+                        label = stringResource(R.string.label_line_height),
+                        value = currentLineHeight,
+                        onValueChange = onLineHeightChange,
+                        valueRange = 1.0f..3.0f,
+                        formatValue = { if (it <= 1.01f) originalLabel else "%.1fx".format(it) }
+                    )
+
+                    FormatSlider(
+                        label = stringResource(R.string.label_paragraph_gap),
+                        value = currentParagraphGap,
+                        onValueChange = onParagraphGapChange,
+                        valueRange = 0.0f..3.0f,
+                        formatValue = { if (it in 0.99f..1.01f) originalLabel else "%.1fx".format(it) }
+                    )
+
+                    FormatSlider(
+                        label = stringResource(R.string.label_image_size),
+                        value = currentImageSize,
+                        onValueChange = onImageSizeChange,
+                        valueRange = 0.5f..2.0f,
+                        formatValue = { if (it in 0.99f..1.01f) originalLabel else "%.1fx".format(it) }
+                    )
+
+                    FormatSlider(
+                        label = stringResource(R.string.label_horizontal_margin),
+                        value = currentHorizontalMargin,
+                        onValueChange = onHorizontalMarginChange,
+                        valueRange = 0.0f..3.0f,
+                        formatValue = {
+                            when {
+                                it <= 0.01f -> noneLabel
+                                it in 0.99f..1.01f -> originalLabel
+                                else -> "%.1fx".format(it)
+                            }
+                        }
+                    )
                 }
-                Spacer(Modifier.height(8.dp))
             }
         }
     }
@@ -761,8 +832,6 @@ fun VisualOptionsSheet(
     onPageInfoModeChange: (PageInfoMode) -> Unit,
     pullToTurnEnabled: Boolean,
     onPullToTurnChange: (Boolean) -> Unit,
-    removeEdgePadding: Boolean,
-    onRemoveEdgePaddingChange: (Boolean) -> Unit,
     pullToTurnMultiplier: Float,
     onPullToTurnMultiplierChange: (Float) -> Unit,
     onDismiss: () -> Unit
@@ -859,30 +928,6 @@ fun VisualOptionsSheet(
                     }
                 }
             }
-
-            Spacer(modifier = Modifier.height(24.dp))
-
-            Surface(
-                shape = RoundedCornerShape(12.dp),
-                color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f),
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .clickable { onRemoveEdgePaddingChange(!removeEdgePadding) }
-            ) {
-                Row(
-                    modifier = Modifier.padding(16.dp),
-                    verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = Arrangement.SpaceBetween
-                ) {
-                    Column(modifier = Modifier.weight(1f)) {
-                        Text(stringResource(R.string.visual_options_edge_padding), style = MaterialTheme.typography.titleMedium)
-                        Text(stringResource(R.string.visual_options_edge_padding_desc), style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant)
-                    }
-                    Spacer(modifier = Modifier.width(16.dp))
-                    Switch(checked = removeEdgePadding, onCheckedChange = { onRemoveEdgePaddingChange(it) })
-                }
-            }
-
             Spacer(modifier = Modifier.height(32.dp))
         }
     }
@@ -922,4 +967,138 @@ fun <T> OptionSegmentedControl(
             }
         }
     }
-}
+}
+
+@Composable
+fun CustomCanvasSlider(
+    value: Float,
+    onValueChange: (Float) -> Unit,
+    valueRange: ClosedFloatingPointRange<Float>,
+    modifier: Modifier = Modifier
+) {
+    val fraction = ((value - valueRange.start) / (valueRange.endInclusive - valueRange.start)).coerceIn(0f, 1f)
+    val activeColor = MaterialTheme.colorScheme.primary
+    val inactiveColor = MaterialTheme.colorScheme.surfaceVariant
+    val thumbColor = MaterialTheme.colorScheme.primary
+
+    Box(
+        modifier = modifier
+            .height(24.dp) // Keeps the touch target height slim
+            .pointerInput(valueRange) {
+                awaitEachGesture {
+                    val down = awaitFirstDown()
+                    fun update(offset: Offset) {
+                        val newFraction = (offset.x / size.width.toFloat()).coerceIn(0f, 1f)
+                        val rawValue = valueRange.start + newFraction * (valueRange.endInclusive - valueRange.start)
+                        // Snap to 0.1 intervals for consistent formatting
+                        onValueChange((rawValue * 10f).roundToInt() / 10f)
+                    }
+                    update(down.position)
+                    drag(down.id) { change ->
+                        change.consume()
+                        update(change.position)
+                    }
+                }
+            }
+    ) {
+        Canvas(modifier = Modifier.fillMaxSize()) {
+            val trackHeight = 4.dp.toPx()
+            val cornerRadius = CornerRadius(trackHeight / 2, trackHeight / 2)
+            val trackY = (size.height - trackHeight) / 2
+
+            // Draw Inactive Track
+            drawRoundRect(
+                color = inactiveColor,
+                topLeft = Offset(0f, trackY),
+                size = Size(size.width, trackHeight),
+                cornerRadius = cornerRadius
+            )
+
+            // Draw Active Track
+            val activeWidth = fraction * size.width
+            drawRoundRect(
+                color = activeColor,
+                topLeft = Offset(0f, trackY),
+                size = Size(activeWidth, trackHeight),
+                cornerRadius = cornerRadius
+            )
+
+            // Draw Thumb
+            val thumbRadius = 8.dp.toPx()
+            drawCircle(
+                color = thumbColor,
+                radius = thumbRadius,
+                center = Offset(
+                    x = activeWidth.coerceIn(thumbRadius, size.width - thumbRadius),
+                    y = size.height / 2
+                )
+            )
+        }
+    }
+}
+
+@Composable
+fun FormatSlider(
+    label: String,
+    value: Float,
+    onValueChange: (Float) -> Unit,
+    valueRange: ClosedFloatingPointRange<Float>,
+    stepSize: Float = 0.1f,
+    formatValue: (Float) -> String
+) {
+    Column(modifier = Modifier.fillMaxWidth()) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(start = 4.dp, end = 4.dp, bottom = 4.dp),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Text(
+                text = label,
+                style = MaterialTheme.typography.labelLarge,
+                fontWeight = FontWeight.SemiBold,
+                color = MaterialTheme.colorScheme.onSurface
+            )
+            Text(
+                text = formatValue(value),
+                style = MaterialTheme.typography.labelLarge,
+                color = MaterialTheme.colorScheme.primary,
+                fontWeight = FontWeight.Bold
+            )
+        }
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            IconButton(
+                onClick = {
+                    val newValue = (value - stepSize).coerceAtLeast(valueRange.start)
+                    onValueChange((newValue * 10f).roundToInt() / 10f)
+                },
+                modifier = Modifier.size(32.dp) // Slimmer buttons
+            ) {
+                Icon(Icons.Default.Remove, contentDescription = "Decrease", tint = MaterialTheme.colorScheme.primary)
+            }
+
+            // Using our new CustomCanvasSlider here!
+            CustomCanvasSlider(
+                value = value,
+                onValueChange = onValueChange,
+                valueRange = valueRange,
+                modifier = Modifier.weight(1f)
+            )
+
+            IconButton(
+                onClick = {
+                    val newValue = (value + stepSize).coerceAtMost(valueRange.endInclusive)
+                    onValueChange((newValue * 10f).roundToInt() / 10f)
+                },
+                modifier = Modifier.size(32.dp) // Slimmer buttons
+            ) {
+                Icon(Icons.Default.Add, contentDescription = "Increase", tint = MaterialTheme.colorScheme.primary)
+            }
+        }
+    }
+}

app/src/main/java/com/aryan/reader/epubreader/EpubReaderTts.kt

@@ -213,6 +213,7 @@ fun TtsSessionObserver(
 fun TtsHighlightHandler(
     ttsState: TtsPlaybackManager.TtsState,
     currentRenderMode: RenderMode,
+    currentChapterIndex: Int,
     webViewRef: WebView?,
     paginator: IPaginator?,
     pagerState: PagerState,
@@ -223,14 +224,42 @@ fun TtsHighlightHandler(
         val text = ttsState.currentText
         val cfi = ttsState.sourceCfi
         val offset = ttsState.startOffsetInSource
+        val activeTtsChapterIndex = ttsState.chapterIndex ?: ttsChapterIndex
+
+        if (
+            currentRenderMode == RenderMode.VERTICAL_SCROLL &&
+            activeTtsChapterIndex != null &&
+            activeTtsChapterIndex != currentChapterIndex
+        ) {
+            Timber.tag("TTS_CHAPTER_CHANGE_DIAG").d(
+                "Vertical highlight skipped because visible chapter differs from active TTS chapter. " +
+                    "visibleChapter=$currentChapterIndex activeTtsChapter=$activeTtsChapterIndex " +
+                    "cfi=${cfi?.take(48)} offset=$offset"
+            )
+            webViewRef?.evaluateJavascript("javascript:window.removeHighlight();", null)
+            return@LaunchedEffect
+        }
 
         if (!text.isNullOrBlank() && !cfi.isNullOrBlank() && offset != -1) {
             val escapedText = escapeJsString(text)
             val escapedCfi = escapeJsString(cfi)
             val jsCommand = "javascript:window.highlightFromCfi('$escapedCfi', '$escapedText', $offset);"
+            if (currentRenderMode == RenderMode.VERTICAL_SCROLL) {
+                Timber.tag("TTS_CHAPTER_CHANGE_DIAG").d(
+                    "Applying vertical TTS highlight. visibleChapter=$currentChapterIndex " +
+                        "activeTtsChapter=$activeTtsChapterIndex cfi=${cfi.take(48)} " +
+                        "offset=$offset textLen=${text.length}"
+                )
+            }
             webViewRef?.evaluateJavascript(jsCommand, null)
         } else {
             if (!ttsState.isPlaying && !ttsState.isLoading) {
+                if (currentRenderMode == RenderMode.VERTICAL_SCROLL) {
+                    Timber.tag("TTS_CHAPTER_CHANGE_DIAG").d(
+                        "Removing vertical TTS highlight because playback is idle. " +
+                            "visibleChapter=$currentChapterIndex activeTtsChapter=$activeTtsChapterIndex"
+                    )
+                }
                 webViewRef?.evaluateJavascript("javascript:window.removeHighlight();", null)
             }
         }
@@ -298,6 +327,7 @@ private fun handleVerticalAutoAdvance(
                         bookTitle = epubBookTitle,
                         chapterTitle = chapters.getOrNull(currentTtsChapterIndex)?.title,
                         coverImageUri = coverImagePath?.let { android.net.Uri.fromFile(File(it)).toString() },
+                        chapterIndex = currentTtsChapterIndex,
                         ttsMode = currentTtsMode,
                         playbackSource = "READER",
                         authToken = token
@@ -327,6 +357,7 @@ private fun handleVerticalAutoAdvance(
                     bookTitle = epubBookTitle,
                     chapterTitle = chapters.getOrNull(nextIdx)?.title,
                     coverImageUri = coverImagePath?.let { Uri.fromFile(File(it)).toString() },
+                    chapterIndex = nextIdx,
                     ttsMode = currentTtsMode,
                     playbackSource = "READER",
                     authToken = token
@@ -401,6 +432,7 @@ private fun handlePaginatedAutoAdvance(
                         bookTitle = epubBookTitle,
                         chapterTitle = chapterTitle,
                         coverImageUri = coverUriString,
+                        chapterIndex = chapterToTry,
                         ttsMode = ttsMode,
                         playbackSource = "READER",
                         authToken = token
@@ -421,4 +453,4 @@ private fun handlePaginatedAutoAdvance(
     } else {
         onUpdateTtsChapter(null)
     }
-}
+}

app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt

@@ -96,7 +96,11 @@ object ExternalDictionaryHelper {
                 putExtra(Intent.EXTRA_PROCESS_TEXT, query)
                 putExtra(Intent.EXTRA_PROCESS_TEXT_READONLY, true)
                 setPackage(packageName)
-                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                // Only add NEW_TASK if we don't have an Activity context,
+                // preventing task switch animations for NoDisplay apps like Notification Dictionary
+                if (context.getActivity() == null) {
+                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                }
             }
 
             if (processTextIntent.resolveActivity(pm) != null) {
@@ -148,7 +152,9 @@ object ExternalDictionaryHelper {
                     putExtra(Intent.EXTRA_PROCESS_TEXT, query)
                     putExtra(Intent.EXTRA_PROCESS_TEXT_READONLY, true)
                     setPackage(packageName)
-                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                    if (context.getActivity() == null) {
+                        addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                    }
                 }
                 if (translateIntent.resolveActivity(pm) != null) {
                     context.startActivity(translateIntent)
@@ -162,7 +168,9 @@ object ExternalDictionaryHelper {
                 putExtra(Intent.EXTRA_PROCESS_TEXT, query)
                 putExtra(Intent.EXTRA_PROCESS_TEXT_READONLY, true)
                 setPackage(packageName)
-                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                if (context.getActivity() == null) {
+                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                }
             }
 
             if (processTextIntent.resolveActivity(pm) != null) {
@@ -281,4 +289,15 @@ object ExternalDictionaryHelper {
 
         return apps.sortedBy { it.label }
     }
+
+    private fun Context.getActivity(): android.app.Activity? {
+        var currentContext = this
+        while (currentContext is android.content.ContextWrapper) {
+            if (currentContext is android.app.Activity) {
+                return currentContext
+            }
+            currentContext = currentContext.baseContext
+        }
+        return null
+    }
 }

app/src/main/java/com/aryan/reader/ml/ISpeechBubbleDetector.kt

@@ -0,0 +1,13 @@
+package com.aryan.reader.ml
+
+import android.graphics.Bitmap
+import android.graphics.RectF
+
+data class SpeechBubble(
+    val bounds: RectF,
+    val maskBitmap: Bitmap? = null
+)
+
+interface ISpeechBubbleDetector : AutoCloseable {
+    fun detectBubbles(bitmap: Bitmap, confidenceThreshold: Float = 0.1f): List<SpeechBubble>
+}

app/src/main/java/com/aryan/reader/paginatedreader/BookPaginator.kt

@@ -119,7 +119,8 @@ class BookPaginator(
     private val context: Context,
     private val mathMLRenderer: MathMLRenderer,
     private val userTextAlign: TextAlign?,
-    private val paragraphGapMultiplier: Float
+    private val paragraphGapMultiplier: Float,
+    private val imageSizeMultiplier: Float
 ) : IPaginator {
     override var totalPageCount by mutableIntStateOf(0)
         private set
@@ -267,7 +268,16 @@ class BookPaginator(
     }
 
     private fun generateConfigurationHash(): Int {
-        val configString = "w:${constraints.maxWidth}-h:${constraints.maxHeight}-fs:${textStyle.fontSize.value}-ta:$userTextAlign-pg:$paragraphGapMultiplier"
+        val configString = buildString {
+            append("w:${constraints.maxWidth}")
+            append("-h:${constraints.maxHeight}")
+            append("-fs:${textStyle.fontSize.value}")
+            append("-lh:${textStyle.lineHeight.value}")
+            append("-ff:${textStyle.fontFamily}")
+            append("-ta:$userTextAlign")
+            append("-pg:$paragraphGapMultiplier")
+            append("-img:$imageSizeMultiplier")
+        }
         val hash = configString.hashCode()
         return hash
     }
@@ -722,7 +732,8 @@ class BookPaginator(
             textMeasurer = textMeasurer,
             constraints = constraints,
             textStyle = textStyle,
-            density = density
+            density = density,
+            imageSizeMultiplier = imageSizeMultiplier
         )
         Timber.d("paginateChapter: Calling PaginatorLogic for chapter $chapterIndex.")
         val pages = paginate(
@@ -971,31 +982,7 @@ class BookPaginator(
                 return@launch
             }
 
-            val chapterPages = pageCache[targetChapterIndex] ?: paginateChapter(targetChapterIndex)
-            val chapterStartPage = calculateAccurateStartIndex(targetChapterIndex)
-
-            if (chapterPages == null) {
-                Timber.e("Href Navigation failed: Could not paginate target chapter $targetChapterIndex.")
-                return@launch
-            }
-
-            var targetPageInChapter = 0
-            if (anchor != null) {
-                Timber.d("Searching for anchor '$anchor' in chapter $targetChapterIndex.")
-                pageLoop@ for ((pageIndex, page) in chapterPages.withIndex()) {
-                    for (block in page.content) {
-                        if (block.elementId == anchor) {
-                            targetPageInChapter = pageIndex
-                            Timber.i("Found anchor '$anchor' on page $pageIndex in chapter $targetChapterIndex")
-                            break@pageLoop
-                        }
-                    }
-                }
-            }
-
-            val finalPageIndex = chapterStartPage + targetPageInChapter
-            Timber.i("Href navigation complete. Final page index: $finalPageIndex")
-            withContext(Dispatchers.Main) { onNavigationComplete(finalPageIndex) }
+            findPageForAnchor(targetChapterIndex, anchor, onNavigationComplete)
         }
     }
 
@@ -1304,4 +1291,4 @@ class BookPaginator(
             return null to null
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/paginatedreader/PaginatedReaderViewModel.kt

@@ -144,7 +144,8 @@ class PaginatedReaderViewModel : ViewModel() {
                 context = context.applicationContext,
                 mathMLRenderer = mathMLRenderer,
                 userTextAlign = null,
-                paragraphGapMultiplier = paragraphGapMultiplier
+                paragraphGapMultiplier = paragraphGapMultiplier,
+                imageSizeMultiplier = 1.0f
             )
             paginator = newPaginator
 
@@ -174,4 +175,4 @@ class PaginatedReaderViewModel : ViewModel() {
     fun onLinkClick(currentChapterPath: String, href: String, onNavigationComplete: (Int) -> Unit) {
         paginator?.navigateToHref(currentChapterPath, href, onNavigationComplete)
     }
-}
+}

app/src/main/java/com/aryan/reader/paginatedreader/Paginator.kt

@@ -50,7 +50,8 @@ class SuspendingAndroidBlockMeasurementProvider(
     private val textMeasurer: TextMeasurer,
     private val constraints: Constraints,
     private val textStyle: TextStyle,
-    private val density: Density
+    private val density: Density,
+    private val imageSizeMultiplier: Float
 ) : BlockMeasurementProvider {
 
     override suspend fun measure(block: ContentBlock): Int {
@@ -60,7 +61,8 @@ class SuspendingAndroidBlockMeasurementProvider(
             constraints = constraints,
             defaultStyle = textStyle,
             headerStyle = textStyle.copy(fontWeight = FontWeight.Bold),
-            density = density
+            density = density,
+            imageSizeMultiplier = imageSizeMultiplier
         )
     }
 
@@ -79,29 +81,12 @@ class SuspendingAndroidBlockMeasurementProvider(
 
         val imageBlock = block.floatedImage
         val (imageWidthPx, imageHeightPx) = run {
-            val imageStyle = imageBlock.style
-            val intrinsicWidth = imageBlock.intrinsicWidth
-            val intrinsicHeight = imageBlock.intrinsicHeight
-
-            if (intrinsicWidth == null || intrinsicHeight == null || intrinsicWidth <= 0f) {
-                0f to 0f
-            } else {
-                val aspectRatio = intrinsicHeight / intrinsicWidth
-                val renderWidth = with(density) {
-                    var w = intrinsicWidth
-
-                    if (imageStyle.width != Dp.Unspecified) {
-                        w = imageStyle.width.toPx()
-                    }
-
-                    if (imageStyle.maxWidth != Dp.Unspecified) {
-                        w = w.coerceAtMost(imageStyle.maxWidth.toPx())
-                    }
-
-                    w.coerceAtMost(constraints.maxWidth.toFloat())
-                }
-                renderWidth to (renderWidth * aspectRatio)
-            }
+            measureScaledImageSizePx(
+                block = imageBlock,
+                density = density,
+                maxWidthPx = constraints.maxWidth.toFloat(),
+                imageSizeMultiplier = imageSizeMultiplier
+            )
         }
 
         if (imageWidthPx <= 0 || imageHeightPx <= 0) {
@@ -668,62 +653,25 @@ private suspend fun measureBlockHeight(
     constraints: Constraints,
     defaultStyle: TextStyle,
     headerStyle: TextStyle,
-    density: Density
+    density: Density,
+    imageSizeMultiplier: Float = 1.0f
 ): Int {
-    var verticalPaddingPx = 0f
-    var horizontalPaddingPx = 0f
-    var verticalBorderPx = 0f
-    var horizontalBorderPx = 0f
-
-    with(density) {
-        verticalPaddingPx = block.style.padding.top.toPx() + block.style.padding.bottom.toPx()
-        horizontalPaddingPx = block.style.padding.left.toPx() + block.style.padding.right.toPx()
-
-        verticalBorderPx = (block.style.borderTop?.width?.toPx() ?: 0f) + (block.style.borderBottom?.width?.toPx() ?: 0f)
-        horizontalBorderPx = (block.style.borderLeft?.width?.toPx() ?: 0f) + (block.style.borderRight?.width?.toPx() ?: 0f)
-    }
-
-    val isBorderBox = block.style.boxSizing == "border-box"
-    val specifiedWidthDp = block.style.width
-    val specifiedMaxWidthDp = block.style.maxWidth
-
-    val blockOuterWidthPx = with(density) {
-        var effectiveWidthPx = constraints.maxWidth.toFloat()
-        if (specifiedWidthDp != Dp.Unspecified) {
-            effectiveWidthPx = specifiedWidthDp.toPx()
-        }
-        if (specifiedMaxWidthDp != Dp.Unspecified) {
-            val maxWidthPx = specifiedMaxWidthDp.toPx()
-            if (effectiveWidthPx > maxWidthPx) {
-                effectiveWidthPx = maxWidthPx
-            }
-        }
-        effectiveWidthPx.coerceAtMost(constraints.maxWidth.toFloat())
-    }
-
-    val contentMaxWidth = if (specifiedWidthDp == Dp.Unspecified) {
-        (blockOuterWidthPx - horizontalPaddingPx - horizontalBorderPx)
-    } else if (isBorderBox) {
-        (blockOuterWidthPx - horizontalPaddingPx - horizontalBorderPx)
-    } else {
-        blockOuterWidthPx
-    }
-
-    val adjustedConstraints = constraints.copy(
-        maxWidth = contentMaxWidth.roundToInt().coerceAtLeast(0),
-        maxHeight = Constraints.Infinity
-    )
+    val boxMetrics = computeBlockBoxMetrics(block, constraints, density)
+    val verticalPaddingPx = boxMetrics.verticalPaddingPx
+    val verticalBorderPx = boxMetrics.verticalBorderPx
+    val adjustedConstraints = boxMetrics.contentConstraints
 
     val contentHeight = when (block) {
         is ParagraphBlock -> {
+            val paragraphStyle = defaultStyle.copy(textAlign = block.textAlign ?: defaultStyle.textAlign)
             val height = withContext(Dispatchers.Main) {
                 textMeasurer.measure(
                     text = block.content,
-                    style = defaultStyle.copy(textAlign = block.textAlign ?: defaultStyle.textAlign),
+                    style = paragraphStyle,
                     constraints = adjustedConstraints
                 ).size.height
             }
-            height
+            height + centeredTextSafetyPaddingPx(paragraphStyle, density)
         }
         is HeaderBlock -> {
             val style = headerStyle.copy(
@@ -736,27 +684,15 @@ private suspend fun measureBlockHeight(
                     constraints = adjustedConstraints
                 ).size.height
             }
-            height
+            height + centeredTextSafetyPaddingPx(style, density)
         }
         is ImageBlock -> {
-            val imageIntrinsicWidth = block.intrinsicWidth
-            val imageIntrinsicHeight = block.intrinsicHeight
-
-            val styledHeightPx = if (block.style.height.isSpecified) with(density) { block.style.height.toPx() } else null
-            val styledWidthPx = if (block.style.width.isSpecified) with(density) { block.style.width.toPx() } else null
-
-            val measuredHeight = when {
-                styledHeightPx != null && styledHeightPx > 0f -> styledHeightPx
-                styledWidthPx != null && styledWidthPx > 0f && imageIntrinsicWidth != null && imageIntrinsicHeight != null && imageIntrinsicWidth > 0 -> {
-                    val aspectRatio = imageIntrinsicHeight / imageIntrinsicWidth
-                    styledWidthPx * aspectRatio
-                }
-                imageIntrinsicWidth != null && imageIntrinsicHeight != null && imageIntrinsicWidth > 0 -> {
-                    val aspectRatio = imageIntrinsicHeight / imageIntrinsicWidth
-                    contentMaxWidth * aspectRatio
-                }
-                else -> with(density) { 250.dp.toPx() }
-            }
+            val measuredHeight = measureScaledImageHeightPx(
+                block = block,
+                density = density,
+                contentMaxWidth = adjustedConstraints.maxWidth.toFloat(),
+                imageSizeMultiplier = imageSizeMultiplier
+            ) ?: with(density) { 250.dp.toPx() }
 
             val finalHeight = measuredHeight.coerceAtMost(constraints.maxHeight.toFloat()).roundToInt()
             Timber.tag("IMAGE_DIAG").d("Measured Image [#${block.blockIndex}]: $finalHeight px (Capped at ${constraints.maxHeight})")
@@ -767,14 +703,15 @@ private suspend fun measureBlockHeight(
             height
         }
         is QuoteBlock -> {
+            val quoteStyle = defaultStyle.copy(textAlign = block.textAlign ?: defaultStyle.textAlign)
             val height = withContext(Dispatchers.Main) {
                 textMeasurer.measure(
                     text = block.content,
-                    style = defaultStyle.copy(textAlign = block.textAlign ?: defaultStyle.textAlign),
+                    style = quoteStyle,
                     constraints = adjustedConstraints
                 ).size.height
             }
-            height
+            height + centeredTextSafetyPaddingPx(quoteStyle, density)
         }
         is ListItemBlock -> {
             val markerWidthPx = with(density) { 32.dp.toPx() }.toInt()
@@ -811,7 +748,7 @@ private suspend fun measureBlockHeight(
 
                     val cellConstraints = adjustedConstraints.copy(maxWidth = cellMaxWidth.coerceAtLeast(0))
 
-                    val cellContentHeight = calculateContentHeightWithMargins(cell.content, textMeasurer, cellConstraints, defaultStyle, headerStyle, density)
+                    val cellContentHeight = calculateContentHeightWithMargins(cell.content, textMeasurer, cellConstraints, defaultStyle, headerStyle, density, imageSizeMultiplier)
 
                     var cellDecorationHeight = 0f
                     with(density) {
@@ -829,35 +766,18 @@ private suspend fun measureBlockHeight(
             val imageBlock = block.floatedImage
 
             val (imageWidthPx, imageHeightPx) = run {
-                val imageStyle = imageBlock.style
-                val intrinsicWidth = imageBlock.intrinsicWidth
-                val intrinsicHeight = imageBlock.intrinsicHeight
-
-                if (intrinsicWidth == null || intrinsicHeight == null || intrinsicWidth <= 0f) {
-                    0f to 0f
-                } else {
-                    val aspectRatio = intrinsicHeight / intrinsicWidth
-                    val renderWidth = with(density) {
-                        var w = intrinsicWidth
-
-                        if (imageStyle.width != Dp.Unspecified) {
-                            w = imageStyle.width.toPx()
-                        }
-
-                        if (imageStyle.maxWidth != Dp.Unspecified) {
-                            w = w.coerceAtMost(imageStyle.maxWidth.toPx())
-                        }
-
-                        w.coerceAtMost(adjustedConstraints.maxWidth.toFloat())
-                    }
-                    renderWidth to (renderWidth * aspectRatio)
-                }
+                measureScaledImageSizePx(
+                    block = imageBlock,
+                    density = density,
+                    maxWidthPx = adjustedConstraints.maxWidth.toFloat(),
+                    imageSizeMultiplier = imageSizeMultiplier
+                )
             }
 
             // If image has no size, it can't float. Just measure the paragraphs.
             if (imageWidthPx <= 0 || imageHeightPx <= 0) {
                 val height = block.paragraphsToWrap.sumOf { p ->
-                    measureBlockHeight(p, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density)
+                    measureBlockHeight(p, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density, imageSizeMultiplier)
                 }
                 return height
             }
@@ -949,10 +869,10 @@ private suspend fun measureBlockHeight(
             val isRow = block.style.flexDirection == "row"
             val height = if (isRow) {
                 block.children.maxOfOrNull { child ->
-                    measureBlockHeight(child, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density)
+                    measureBlockHeight(child, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density, imageSizeMultiplier)
                 } ?: 0
             } else {
-                calculateContentHeightWithMargins(block.children, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density)
+                calculateContentHeightWithMargins(block.children, textMeasurer, adjustedConstraints, defaultStyle, headerStyle, density, imageSizeMultiplier)
             }
             height
         }
@@ -980,7 +900,7 @@ private suspend fun measureBlockHeight(
         }
     }
     val specifiedHeightDp = block.style.height
-    val finalHeight = if (isBorderBox && specifiedHeightDp != Dp.Unspecified) {
+    val finalHeight = if (block.style.boxSizing == "border-box" && specifiedHeightDp != Dp.Unspecified) {
         with(density) { specifiedHeightDp.toPx().roundToInt() }
     } else {
         (contentHeight + verticalPaddingPx + verticalBorderPx).roundToInt()
@@ -1000,6 +920,10 @@ private suspend fun splitParagraphBlock(
 ): Pair<ParagraphBlock, ParagraphBlock>? {
     val text = block.content
     if (text.isEmpty()) return null
+    val boxMetrics = computeBlockBoxMetrics(block, constraints, density)
+    val paragraphConstraints = boxMetrics.contentConstraints
+    val paragraphStyle = textStyle.copy(textAlign = block.textAlign ?: textStyle.textAlign)
+    val centeredSafetyPaddingPx = centeredTextSafetyPaddingPx(paragraphStyle, density)
 
     val decorationTop = with(density) {
         block.style.padding.top.toPx() + (block.style.borderTop?.width?.toPx() ?: 0f)
@@ -1009,7 +933,7 @@ private suspend fun splitParagraphBlock(
         block.style.padding.bottom.toPx() + (block.style.borderBottom?.width?.toPx() ?: 0f)
     }.roundToInt()
 
-    val availableTextHeight = availableHeight - decorationTop - decorationBottom
+    val availableTextHeight = availableHeight - decorationTop - decorationBottom - centeredSafetyPaddingPx
 
     Timber.tag("PAGINATION_DEBUG").d("SplitPara: totalAvail=$availableHeight, topDec=$decorationTop, botDec=$decorationBottom, textAvail=$availableTextHeight")
 
@@ -1021,8 +945,8 @@ private suspend fun splitParagraphBlock(
     val layoutResult = withContext(Dispatchers.Main) {
         textMeasurer.measure(
             text = text,
-            style = textStyle,
-            constraints = constraints.copy(maxHeight = Constraints.Infinity)
+            style = paragraphStyle,
+            constraints = paragraphConstraints
         )
     }
 
@@ -1036,7 +960,7 @@ private suspend fun splitParagraphBlock(
 
     var lastVisibleLine = layoutResult.getLineForVerticalPosition(availableTextHeight.toFloat())
 
-    if (layoutResult.getLineBottom(lastVisibleLine) > availableHeight.toFloat()) {
+    if (layoutResult.getLineBottom(lastVisibleLine) > availableTextHeight.toFloat()) {
         lastVisibleLine--
     }
 
@@ -1056,7 +980,8 @@ private suspend fun splitParagraphBlock(
         val part2Layout = withContext(Dispatchers.Main) {
             textMeasurer.measure(
                 text = part2CheckText,
-                constraints = constraints
+                style = paragraphStyle,
+                constraints = paragraphConstraints
             )
         }
         if (part2Layout.lineCount == 1) {
@@ -1149,11 +1074,12 @@ private suspend fun calculateContentHeightWithMargins(
     constraints: Constraints,
     defaultStyle: TextStyle,
     headerStyle: TextStyle,
-    density: Density
+    density: Density,
+    imageSizeMultiplier: Float = 1.0f
 ): Int {
     var totalHeight = 0
     children.forEachIndexed { index, child ->
-        val childHeight = measureBlockHeight(child, textMeasurer, constraints, defaultStyle, headerStyle, density)
+        val childHeight = measureBlockHeight(child, textMeasurer, constraints, defaultStyle, headerStyle, density, imageSizeMultiplier)
         val margin = with(density) {
             if (index > 0) {
                 val prevMargin = children[index - 1].style.margin.bottom.toPx()
@@ -1172,6 +1098,117 @@ private suspend fun calculateContentHeightWithMargins(
     return totalHeight
 }
 
+private data class BlockBoxMetrics(
+    val verticalPaddingPx: Float,
+    val verticalBorderPx: Float,
+    val contentConstraints: Constraints
+)
+
+private fun computeBlockBoxMetrics(
+    block: ContentBlock,
+    constraints: Constraints,
+    density: Density
+): BlockBoxMetrics {
+    val verticalPaddingPx: Float
+    val horizontalPaddingPx: Float
+    val verticalBorderPx: Float
+    val horizontalBorderPx: Float
+
+    with(density) {
+        verticalPaddingPx = block.style.padding.top.toPx() + block.style.padding.bottom.toPx()
+        horizontalPaddingPx = block.style.padding.left.toPx() + block.style.padding.right.toPx()
+        verticalBorderPx = (block.style.borderTop?.width?.toPx() ?: 0f) + (block.style.borderBottom?.width?.toPx() ?: 0f)
+        horizontalBorderPx = (block.style.borderLeft?.width?.toPx() ?: 0f) + (block.style.borderRight?.width?.toPx() ?: 0f)
+    }
+
+    val isBorderBox = block.style.boxSizing == "border-box"
+    val specifiedWidthDp = block.style.width
+    val specifiedMaxWidthDp = block.style.maxWidth
+
+    val blockOuterWidthPx = with(density) {
+        var effectiveWidthPx = constraints.maxWidth.toFloat()
+        if (specifiedWidthDp != Dp.Unspecified) {
+            effectiveWidthPx = specifiedWidthDp.toPx()
+        }
+        if (specifiedMaxWidthDp != Dp.Unspecified) {
+            val maxWidthPx = specifiedMaxWidthDp.toPx()
+            if (effectiveWidthPx > maxWidthPx) {
+                effectiveWidthPx = maxWidthPx
+            }
+        }
+        effectiveWidthPx.coerceAtMost(constraints.maxWidth.toFloat())
+    }
+
+    val contentMaxWidth = if (specifiedWidthDp == Dp.Unspecified || isBorderBox) {
+        blockOuterWidthPx - horizontalPaddingPx - horizontalBorderPx
+    } else {
+        blockOuterWidthPx
+    }
+
+    return BlockBoxMetrics(
+        verticalPaddingPx = verticalPaddingPx,
+        verticalBorderPx = verticalBorderPx,
+        contentConstraints = constraints.copy(
+            maxWidth = contentMaxWidth.roundToInt().coerceAtLeast(0),
+            maxHeight = Constraints.Infinity
+        )
+    )
+}
+
+private fun centeredTextSafetyPaddingPx(
+    style: TextStyle,
+    density: Density
+): Int {
+    if (style.textAlign != androidx.compose.ui.text.style.TextAlign.Center) return 0
+
+    val fallbackLineHeight = if (style.fontSize.isSpecified) {
+        style.fontSize * 1.2f
+    } else {
+        16.sp * 1.2f
+    }
+    val effectiveLineHeight = if (style.lineHeight.isSpecified) style.lineHeight else fallbackLineHeight
+
+    return with(density) { effectiveLineHeight.toPx().roundToInt() }
+}
+
+private fun measureScaledImageHeightPx(
+    block: ImageBlock,
+    density: Density,
+    contentMaxWidth: Float,
+    imageSizeMultiplier: Float
+): Float? = measureScaledImageSizePx(
+    block = block,
+    density = density,
+    maxWidthPx = contentMaxWidth,
+    imageSizeMultiplier = imageSizeMultiplier
+).second.takeIf { it > 0f }
+
+private fun measureScaledImageSizePx(
+    block: ImageBlock,
+    density: Density,
+    maxWidthPx: Float,
+    imageSizeMultiplier: Float
+): Pair<Float, Float> {
+    val intrinsicWidth = block.intrinsicWidth
+    val intrinsicHeight = block.intrinsicHeight
+    if (intrinsicWidth == null || intrinsicHeight == null || intrinsicWidth <= 0f || intrinsicHeight <= 0f) {
+        return 0f to 0f
+    }
+
+    val aspectRatio = intrinsicHeight / intrinsicWidth
+    val baseWidth = with(density) {
+        if (block.style.width.isSpecified) block.style.width.toPx() else maxWidthPx
+    }
+
+    var scaledWidth = baseWidth * imageSizeMultiplier
+    if (block.style.maxWidth.isSpecified) {
+        scaledWidth = scaledWidth.coerceAtMost(with(density) { block.style.maxWidth.toPx() } * imageSizeMultiplier)
+    }
+    scaledWidth = scaledWidth.coerceAtMost(maxWidthPx)
+
+    return scaledWidth to (scaledWidth * aspectRatio)
+}
+
 private fun zeroOutBottomMargin(blocks: MutableList<ContentBlock>) {
     if (blocks.isNotEmpty()) {
         val lastBlock = blocks.last()
@@ -1180,4 +1217,4 @@ private fun zeroOutBottomMargin(blocks: MutableList<ContentBlock>) {
             setBlockExpectedHeight(copyBlockWithNewStyle(lastBlock, newLastStyle), lastBlock.expectedHeight)
         blocks[blocks.size - 1] = newLastBlock
     }
-}
+}

app/src/main/java/com/aryan/reader/paginatedreader/data/BookCacheDatabase.kt

@@ -198,7 +198,7 @@ abstract class BookCacheDao {
         ConfigurationCache::class,
         AnchorIndexEntry::class
     ],
-    version = 7,
+    version = 8,
     exportSchema = false
 )
 abstract class BookCacheDatabase : RoomDatabase() {

app/src/main/java/com/aryan/reader/paginatedreader/data/BookCacheEntities.kt

@@ -25,7 +25,7 @@ import androidx.room.ForeignKey
 import androidx.room.Index
 import androidx.room.PrimaryKey
 
-const val LATEST_PROCESSING_VERSION = 7
+const val LATEST_PROCESSING_VERSION = 8
 
 @Entity(tableName = "processed_books")
 data class ProcessedBook(

app/src/main/java/com/aryan/reader/pdf/DemoAnnotationGenerator.kt

@@ -26,10 +26,8 @@ import com.aryan.reader.pdf.data.PdfAnnotation
 
 object DemoAnnotationGenerator {
 
-    // --- SVG Configuration ---
     private const val SVG_WIDTH = 800f
 
-    // Extracted from your Figma SVG
     private val DECORATIVE_DOTS = listOf(
         DotData(120f, 90f, 5f, Color(0xFFF59E0B), 0.7f),
         DotData(680f, 210f, 6f, Color(0xFFEC4899), 0.7f),
@@ -72,47 +70,36 @@ object DemoAnnotationGenerator {
     fun generateDemoAnnotations(pageIndex: Int): List<PdfAnnotation> {
         val annotations = mutableListOf<PdfAnnotation>()
 
-        // --- Layout Calculation ---
-        // We want the SVG to occupy 80% of the page width, centered.
-        // PDF coordinates are 0..1.
         val targetWidthPercent = 0.8f
-        // SVG aspect ratio 300 / 800 = 0.375
 
-        // Calculate scale factor relative to normalized page coordinates
         val scaleX = targetWidthPercent / SVG_WIDTH
-        val scaleY = scaleX // Keep uniform scale in abstract space
 
         // Center offsets (0.5 is middle of page)
         val startX = (1f - targetWidthPercent) / 2f
-        val startY = 0.4f // Position slightly above center vertically
+        val startY = 0.2f
 
         var currentTime = System.currentTimeMillis()
 
-        // Helper to transform SVG points to PDF Page Points
         fun transformPoint(x: Float, y: Float): PdfPoint {
             val pdfX = startX + (x * scaleX)
-            val pdfY = startY + (y * scaleY)
+            val pdfY = startY + (y * scaleX)
             return PdfPoint(pdfX, pdfY, currentTime)
         }
 
-        // 1. Render Decorative Dots
         DECORATIVE_DOTS.forEach { dot ->
             val pdfPoint = transformPoint(dot.cx, dot.cy)
 
-            // To make a "Dot" with the pen, we need at least 2 points very close together
-            // or a single point might not render depending on the implementation.
             val points = listOf(
                 pdfPoint,
                 pdfPoint.copy(x = pdfPoint.x + 0.0001f, timestamp = currentTime + 10)
             )
 
-            // Convert SVG radius to stroke width
             val relativeThickness = (dot.r / SVG_WIDTH) * 2.5f
 
             annotations.add(
                 PdfAnnotation(
                     type = AnnotationType.INK,
-                    inkType = InkType.PEN, // Standard pen for dots
+                    inkType = InkType.PEN,
                     pageIndex = pageIndex,
                     points = points,
                     color = dot.color.copy(alpha = dot.alpha),
@@ -122,7 +109,6 @@ object DemoAnnotationGenerator {
             currentTime += 50
         }
 
-        // 2. Render Text ("Try Episteme!")
         val textPaths = splitSvgPaths(TEXT_STROKES_DATA)
         textPaths.forEach { pathString ->
             val path = PathParser.createPathFromPathData(pathString)
@@ -130,7 +116,6 @@ object DemoAnnotationGenerator {
 
             if (flattenedPoints.isNotEmpty()) {
                 val pdfPoints = flattenedPoints.mapIndexed { _, p ->
-                    // Increment time to simulate drawing speed for Fountain Pen physics
                     currentTime += 8
                     transformPoint(p.x, p.y).copy(timestamp = currentTime)
                 }
@@ -138,18 +123,17 @@ object DemoAnnotationGenerator {
                 annotations.add(
                     PdfAnnotation(
                         type = AnnotationType.INK,
-                        inkType = InkType.FOUNTAIN_PEN, // Handwriting looks best with this
+                        inkType = InkType.FOUNTAIN_PEN,
                         pageIndex = pageIndex,
                         points = pdfPoints,
-                        color = Color(0xFF418377), // Updated Green
-                        strokeWidth = 0.004f // Fine tip
+                        color = Color(0xFF418377),
+                        strokeWidth = 0.004f
                     )
                 )
-                currentTime += 150 // Pen lift delay
+                currentTime += 150
             }
         }
 
-        // 3. Render Underline
         val underlinePath = PathParser.createPathFromPathData(UNDERLINE_DATA)
         val underlinePointsRaw = flattenPath(underlinePath)
         val underlinePdfPoints = underlinePointsRaw.map { p ->
@@ -160,10 +144,10 @@ object DemoAnnotationGenerator {
         annotations.add(
             PdfAnnotation(
                 type = AnnotationType.INK,
-                inkType = InkType.PEN, // Consistent width for underline
+                inkType = InkType.PEN,
                 pageIndex = pageIndex,
                 points = underlinePdfPoints,
-                color = Color(0xFFEC4899).copy(alpha = 0.6f), // Pink
+                color = Color(0xFFEC4899).copy(alpha = 0.6f),
                 strokeWidth = 0.005f
             )
         )
@@ -171,8 +155,6 @@ object DemoAnnotationGenerator {
         return annotations
     }
 
-    // --- Helpers ---
-
     private data class DotData(val cx: Float, val cy: Float, val r: Float, val color: Color, val alpha: Float)
     private data class PointF(val x: Float, val y: Float)
 
@@ -180,11 +162,9 @@ object DemoAnnotationGenerator {
      * Android's Path doesn't give us points directly. We use approximate().
      */
     private fun flattenPath(path: Path): List<PointF> {
-        // Approximate the path with error tolerance 0.5 (pixels in SVG space)
         val approximation = path.approximate(0.5f)
         val points = mutableListOf<PointF>()
 
-        // approximation array format: [t0, x0, y0, t1, x1, y1, ...]
         var i = 0
         while (i < approximation.size) {
             val x = approximation[i + 1]
@@ -204,15 +184,12 @@ object DemoAnnotationGenerator {
         val result = mutableListOf<String>()
 
         rawPaths.forEach { fullPathString ->
-            // Clean up and standardize
             val cleanStr = fullPathString.trim()
 
-            // Split by "M" (Move command).
             val parts = cleanStr.split("M")
 
             parts.forEach { part ->
                 if (part.isNotBlank()) {
-                    // Re-prepend M because split removed it
                     result.add("M ${part.trim()}")
                 }
             }

app/src/main/java/com/aryan/reader/pdf/PdfDrawer.kt

@@ -1,9 +1,24 @@
-// PdfNavigationDrawerContent.kt
 package com.aryan.reader.pdf
 
+import androidx.compose.animation.animateColorAsState
+import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
+import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.itemsIndexed
@@ -13,29 +28,260 @@ import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
+import androidx.compose.material.icons.filled.KeyboardArrowDown
 import androidx.compose.material.icons.filled.MoreVert
-import androidx.compose.material3.*
-import androidx.compose.runtime.*
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FilterChip
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.ListItem
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.ScrollableTabRow
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Tab
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import io.legere.pdfiumandroid.api.Bookmark
+import io.legere.pdfiumandroid.suspend.PdfDocumentKt
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import org.json.JSONArray
+import timber.log.Timber
+import androidx.core.graphics.createBitmap
+
+private const val MAX_FIXED_RECURSION = 128
+
+internal data class PdfBookmark(val pageIndex: Int, val title: String, val totalPages: Int)
+
+internal data class TocEntry(val title: String, val pageIndex: Int, val nestLevel: Int)
+
+/**
+ * Patches the library bug where siblings are truncated due to depth-state leakage.
+ */
+suspend fun PdfDocumentKt.getFixedTableOfContents(): List<Bookmark> {
+    val tag = "PdfTocFix"
+    Timber.tag(tag).i("Starting Pure Reflection Traversal...")
+
+    return try {
+        // 1. Get the 'document' field (PdfDocumentU) from PdfDocumentKt
+        val documentField = PdfDocumentKt::class.java.getDeclaredField("document").apply { isAccessible = true }
+        val docUInstance = documentField.get(this) ?: return getTableOfContents()
+
+        // 2. Get the 'nativeDocument' field from PdfDocumentU
+        val nativeDocField = docUInstance.javaClass.getDeclaredField("nativeDocument").apply { isAccessible = true }
+        val nativeDocInstance = nativeDocField.get(docUInstance) ?: return getTableOfContents()
+
+        // 3. Get the native pointer (long) from PdfDocumentU
+        val ptrField = docUInstance.javaClass.getDeclaredField("mNativeDocPtr").apply { isAccessible = true }
+        val mNativeDocPtr = ptrField.get(docUInstance) as Long
+
+        // 4. Look up native methods using primitive 'long' types (mandatory for JNI)
+        val nClass = nativeDocInstance.javaClass
+        val lp = Long::class.javaPrimitiveType!! // Shorthand for 'long'
+
+        val getTitleM = nClass.getMethod("getBookmarkTitle", lp)
+        val getDestIdxM = nClass.getMethod("getBookmarkDestIndex", lp, lp)
+        val getFirstChildM = nClass.getMethod("getFirstChildBookmark", lp, lp)
+        val getSiblingM = nClass.getMethod("getSiblingBookmark", lp, lp)
+
+        val topLevel = mutableListOf<Bookmark>()
+        val visited = mutableSetOf<Long>()
+
+        /**
+         * Corrected traversal: Iterative for siblings, recursive for children.
+         */
+        fun walk(parentList: MutableList<Bookmark>, startPtr: Long, level: Int) {
+            var currentPtr = startPtr
+            var itemIndex = 0
+
+            while (currentPtr != 0L) {
+                if (visited.contains(currentPtr)) break
+                visited.add(currentPtr)
+
+                val title = getTitleM.invoke(nativeDocInstance, currentPtr) as? String ?: "Untitled"
+                val pageIdx = getDestIdxM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
+
+                Timber.tag(tag).v("Lvl $level | Item $itemIndex | Ptr: 0x${java.lang.Long.toHexString(currentPtr)} | $title")
+
+                val bookmark = Bookmark().apply {
+                    this.mNativePtr = currentPtr
+                    this.title = title
+                    this.pageIdx = pageIdx
+                }
+                parentList.add(bookmark)
+
+                // Recursive dive into children
+                val firstChild = getFirstChildM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
+                if (firstChild != 0L && level < MAX_FIXED_RECURSION) {
+                    walk(bookmark.children, firstChild, level + 1)
+                }
+
+                // Iterative move to next sibling
+                currentPtr = getSiblingM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
+                itemIndex++
+            }
+        }
+
+        // 5. Start from the root (Pass 0L as primitive long)
+        val firstRoot = getFirstChildM.invoke(nativeDocInstance, mNativeDocPtr, 0L) as Long
+        if (firstRoot != 0L) {
+            walk(topLevel, firstRoot, 0)
+        }
+
+        if (topLevel.isEmpty()) {
+            Timber.tag(tag).w("No items found, falling back to library.")
+            getTableOfContents()
+        } else {
+            Timber.tag(tag).i("TOC Successfully Patched! Nodes: ${visited.size}")
+            topLevel
+        }
+    } catch (e: Exception) {
+        Timber.tag(tag).e(e, "Reflection traversal critical error.")
+        this.getTableOfContents()
+    }
+}
+
+internal fun flattenToc(bookmarks: List<Bookmark>, level: Int = 0): List<TocEntry> {
+    Timber.tag("PdfTocDebug").d("Processing level $level with ${bookmarks.size} items")
+    val entries = mutableListOf<TocEntry>()
+    for ((index, bookmark) in bookmarks.withIndex()) {
+        val title = bookmark.title ?: "Untitled Chapter"
+        val childCount = bookmark.children.size
+
+        Timber.tag("PdfTocDebug").d(
+            "Lvl $level | Item $index: \"$title\" (Page: ${bookmark.pageIdx}) | Children: $childCount"
+        )
+
+        entries.add(
+            TocEntry(
+                title = title,
+                pageIndex = bookmark.pageIdx.toInt(),
+                nestLevel = level
+            )
+        )
+
+        if (childCount > 0) {
+            Timber.tag("PdfTocDebug").v("Entering children of \"$title\"")
+            entries.addAll(flattenToc(bookmark.children, level + 1))
+            Timber.tag("PdfTocDebug").v("Returned to Lvl $level from \"$title\"")
+        }
+    }
+    return entries
+}
+
+internal fun loadPdfBookmarksFromJson(bookmarksJson: String?): Set<PdfBookmark> {
+    if (bookmarksJson.isNullOrBlank()) return emptySet()
+    return try {
+        val jsonArray = JSONArray(bookmarksJson)
+        (0 until jsonArray.length()).mapNotNull { i ->
+            try {
+                val json = jsonArray.getJSONObject(i)
+                PdfBookmark(
+                    pageIndex = json.getInt("pageIndex"),
+                    title = json.getString("title"),
+                    totalPages = json.getInt("totalPages")
+                )
+            } catch (e: Exception) {
+                Timber.e(e, "Failed to parse bookmark from JSON object")
+                null
+            }
+        }.toSet()
+    } catch (e: Exception) {
+        Timber.e(e, "Failed to parse bookmarks from JSON string: $bookmarksJson")
+        emptySet()
+    }
+}
+
+@Composable
+internal fun PdfTocTreeItem(
+    label: String,
+    nestLevel: Int,
+    isExpanded: Boolean,
+    hasChildren: Boolean,
+    isCurrent: Boolean,
+    onToggleExpand: () -> Unit,
+    onClick: () -> Unit
+) {
+    val backgroundColor by animateColorAsState(
+        targetValue = if (isCurrent) MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.2f) else Color.Transparent,
+        label = "TocItemBackground"
+    )
+
+    val contentColor = if (isCurrent) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurface
+
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .heightIn(min = 48.dp)
+            .background(backgroundColor)
+            .clickable(onClick = onClick)
+            .padding(vertical = 4.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Spacer(modifier = Modifier.width((16 * nestLevel).dp))
+
+        Box(
+            modifier = Modifier
+                .size(40.dp)
+                .clickable(enabled = hasChildren, onClick = onToggleExpand),
+            contentAlignment = Alignment.Center
+        ) {
+            if (hasChildren) {
+                Icon(
+                    imageVector = if (isExpanded) Icons.Default.KeyboardArrowDown else Icons.AutoMirrored.Filled.KeyboardArrowRight,
+                    contentDescription = if (isExpanded) "Collapse" else "Expand",
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        }
+
+        Text(
+            text = label,
+            style = if (nestLevel == 0) MaterialTheme.typography.bodyLarge else MaterialTheme.typography.bodyMedium,
+            fontWeight = if (isCurrent) FontWeight.Bold else if (nestLevel == 0) FontWeight.SemiBold else FontWeight.Normal,
+            color = contentColor,
+            maxLines = 2,
+            overflow = TextOverflow.Ellipsis,
+            modifier = Modifier.weight(1f).padding(end = 16.dp)
+        )
+    }
+}
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 internal fun PdfNavigationDrawerContent(
+    pdfDocument: ReaderDocument?,
     flatTableOfContents: List<TocEntry>,
     bookmarks: Set<PdfBookmark>,
     userHighlights: List<PdfUserHighlight>,
     currentPage: Int,
+    totalPages: Int,
     customHighlightColors: Map<PdfHighlightColor, Color>,
     onPageSelected: (Int) -> Unit,
     onRenameBookmark: (PdfBookmark, String) -> Unit,
@@ -44,11 +290,15 @@ internal fun PdfNavigationDrawerContent(
     onNoteRequested: (String?) -> Unit,
     onCloseDrawer: () -> Unit
 ) {
-    val drawerPagerState = rememberPagerState(pageCount = { 3 })
+    val drawerPagerState = rememberPagerState(pageCount = { 4 })
     val drawerScope = rememberCoroutineScope()
 
     Column(modifier = Modifier.fillMaxSize()) {
-        TabRow(selectedTabIndex = drawerPagerState.currentPage) {
+        ScrollableTabRow(
+            selectedTabIndex = drawerPagerState.currentPage,
+            edgePadding = 8.dp,
+            modifier = Modifier.fillMaxWidth()
+        ) {
             Tab(selected = drawerPagerState.currentPage == 0, onClick = {
                 drawerScope.launch { drawerPagerState.animateScrollToPage(0) }
             }, text = { Text("Chapters") })
@@ -68,6 +318,14 @@ internal fun PdfNavigationDrawerContent(
                 text = { Text("Highlights") },
                 modifier = Modifier.testTag("HighlightsTab")
             )
+            Tab(
+                selected = drawerPagerState.currentPage == 3,
+                onClick = {
+                    drawerScope.launch { drawerPagerState.animateScrollToPage(3) }
+                },
+                text = { Text("Pages") },
+                modifier = Modifier.testTag("PagesTab")
+            )
         }
 
         HorizontalPager(
@@ -531,6 +789,130 @@ internal fun PdfNavigationDrawerContent(
                         }
                     }
                 }
+                3 -> { // Pages Page
+                    val listState = rememberLazyListState()
+                    val pageRows = remember(totalPages) { (0 until totalPages).chunked(3) }
+
+                    val currentRowIndex = currentPage / 3
+
+                    Column(modifier = Modifier.fillMaxSize()) {
+                        Row(
+                            modifier = Modifier.fillMaxWidth().padding(horizontal = 4.dp),
+                            horizontalArrangement = Arrangement.SpaceEvenly
+                        ) {
+                            TextButton(
+                                onClick = {
+                                    drawerScope.launch {
+                                        if (currentRowIndex in pageRows.indices) {
+                                            listState.animateScrollToItem(currentRowIndex)
+                                        }
+                                    }
+                                }
+                            ) {
+                                Text("Locate")
+                            }
+                        }
+
+                        HorizontalDivider()
+
+                        Box(modifier = Modifier.fillMaxWidth().weight(1f)) {
+                            LazyColumn(
+                                state = listState,
+                                modifier = Modifier
+                                    .fillMaxHeight()
+                                    .padding(end = 12.dp)
+                            ) {
+                                items(pageRows, key = { it.firstOrNull() ?: 0 }) { row ->
+                                    Row(
+                                        modifier = Modifier
+                                            .fillMaxWidth()
+                                            .padding(vertical = 4.dp, horizontal = 8.dp),
+                                        horizontalArrangement = Arrangement.spacedBy(8.dp)
+                                    ) {
+                                        row.forEach { pageIdx ->
+                                            Box(
+                                                modifier = Modifier
+                                                    .weight(1f)
+                                                    .aspectRatio(0.707f)
+                                                    .background(
+                                                        MaterialTheme.colorScheme.surfaceVariant,
+                                                        RoundedCornerShape(4.dp)
+                                                    )
+                                                    .border(
+                                                        width = if (currentPage == pageIdx) 2.dp else 1.dp,
+                                                        color = if (currentPage == pageIdx) MaterialTheme.colorScheme.primary else Color.Black.copy(alpha = 0.1f),
+                                                        shape = RoundedCornerShape(4.dp)
+                                                    )
+                                                    .clickable {
+                                                        onCloseDrawer()
+                                                        onPageSelected(pageIdx)
+                                                    },
+                                                contentAlignment = Alignment.Center
+                                            ) {
+                                                var thumb by remember { mutableStateOf(PdfThumbnailCache.get(pageIdx)) }
+
+                                                LaunchedEffect(pageIdx, pdfDocument) {
+                                                    if (thumb == null && pdfDocument != null) {
+                                                        withContext(kotlinx.coroutines.Dispatchers.IO) {
+                                                            try {
+                                                                val cached = PdfThumbnailCache.get(pageIdx)
+                                                                if (cached != null) {
+                                                                    thumb = cached
+                                                                } else {
+                                                                    pdfDocument.openPage(pageIdx)?.use { p ->
+                                                                        val w = p.getPageWidthPoint()
+                                                                        val h = p.getPageHeightPoint()
+                                                                        val ratio = if (h > 0) w.toFloat() / h.toFloat() else 1f
+                                                                        val thumbW = 200
+                                                                        val thumbH = (thumbW / ratio).toInt().coerceAtLeast(1)
+                                                                        val bmp = createBitmap(thumbW, thumbH)
+                                                                        bmp.eraseColor(android.graphics.Color.WHITE)
+                                                                        p.renderPageBitmap(bmp, 0, 0, thumbW, thumbH, false)
+                                                                        PdfThumbnailCache.put(pageIdx, bmp)
+                                                                        thumb = bmp
+                                                                    }
+                                                                }
+                                                            } catch (_: Exception) { }
+                                                        }
+                                                    }
+                                                }
+
+                                                if (thumb != null) {
+                                                    Image(
+                                                        bitmap = thumb!!.asImageBitmap(),
+                                                        contentDescription = "Page ${pageIdx + 1}",
+                                                        modifier = Modifier.fillMaxSize()
+                                                    )
+                                                }
+
+                                                Text(
+                                                    text = "${pageIdx + 1}",
+                                                    style = MaterialTheme.typography.labelMedium.copy(
+                                                        fontWeight = FontWeight.Bold
+                                                    ),
+                                                    color = Color.White,
+                                                    modifier = Modifier
+                                                        .align(Alignment.BottomEnd)
+                                                        .padding(4.dp)
+                                                        .background(
+                                                            Color.Black.copy(alpha = 0.5f),
+                                                            RoundedCornerShape(6.dp)
+                                                        )
+                                                        .padding(horizontal = 6.dp, vertical = 2.dp)
+                                                )
+                                            }
+                                        }
+                                        repeat(3 - row.size) { Spacer(modifier = Modifier.weight(1f)) }
+                                    }
+                                }
+                            }
+                            VerticalScrollbar(
+                                listState = listState,
+                                modifier = Modifier.align(Alignment.CenterEnd)
+                            )
+                        }
+                    }
+                }
             }
         }
     }

app/src/main/java/com/aryan/reader/pdf/PdfNavigationUI.kt

@@ -239,15 +239,45 @@ internal fun BookmarkButton(
 }
 
 @Composable
-internal fun ZoomPercentageIndicator(percentage: Int) {
+internal fun ZoomPercentageIndicator(
+    percentage: Int,
+    onResetZoomClick: () -> Unit
+) {
     Surface(
         shape = RoundedCornerShape(8.dp), color = MaterialTheme.colorScheme.scrim.copy(alpha = 0.8f)
     ) {
-        Text(
-            text = "$percentage%",
-            color = Color.White,
-            style = MaterialTheme.typography.bodyLarge,
+        androidx.compose.foundation.layout.Row(
+            verticalAlignment = Alignment.CenterVertically,
             modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp)
-        )
+        ) {
+            Text(
+                text = "$percentage%",
+                color = Color.White,
+                style = MaterialTheme.typography.bodyLarge
+            )
+
+            Spacer(modifier = Modifier.width(8.dp))
+
+            // Divider
+            Box(
+                modifier = Modifier
+                    .width(1.dp)
+                    .height(16.dp)
+                    .background(Color.White.copy(alpha = 0.5f))
+            )
+
+            Spacer(modifier = Modifier.width(8.dp))
+
+            // Reset Zoom Button
+            Icon(
+                painter = painterResource(id = R.drawable.zoom_out),
+                contentDescription = "Reset Zoom",
+                tint = Color.White,
+                modifier = Modifier
+                    .size(20.dp)
+                    .clip(RoundedCornerShape(4.dp))
+                    .clickable(onClick = onResetZoomClick)
+            )
+        }
     }
 }

app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt

@@ -13,6 +13,7 @@ import android.graphics.RectF
 import android.graphics.Shader
 import android.util.LruCache
 import androidx.activity.compose.BackHandler
+import androidx.compose.ui.graphics.drawscope.withTransform
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.RepeatMode
 import androidx.compose.animation.core.animateFloat
@@ -83,6 +84,9 @@ import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.input.pointer.PointerEventTimeoutCancellationException
 import androidx.compose.ui.input.pointer.PointerType
 import androidx.compose.ui.input.pointer.changedToUp
+import androidx.compose.ui.input.pointer.isPrimaryPressed
+import androidx.compose.ui.input.pointer.isSecondaryPressed
+import androidx.compose.ui.input.pointer.isTertiaryPressed
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.input.pointer.positionChanged
 import androidx.compose.ui.input.pointer.util.VelocityTracker
@@ -115,6 +119,7 @@ import androidx.core.graphics.scale
 import androidx.core.graphics.set
 import com.aryan.reader.R
 import com.aryan.reader.SearchResult
+import com.aryan.reader.ml.SpeechBubble
 import com.aryan.reader.pdf.data.PdfAnnotation
 import com.aryan.reader.pdf.data.PdfTextBox
 import com.aryan.reader.pdf.data.VirtualPage
@@ -187,6 +192,78 @@ data class PageLink(
     val source: LinkSource
 )
 
+private data class ExpandedBubbleRender(
+    val bitmap: Bitmap,
+    val zoomFactor: Float
+)
+
+private fun computeDynamicBubbleZoomFactor(
+    bubbleBounds: RectF,
+    viewportWidth: Float,
+    viewportHeight: Float
+): Float {
+    if (bubbleBounds.width() <= 0f || bubbleBounds.height() <= 0f) return 1.5f
+    val targetWidth = viewportWidth * 0.6f
+    val targetHeight = viewportHeight * 0.32f
+    return min(targetWidth / bubbleBounds.width(), targetHeight / bubbleBounds.height())
+        .coerceIn(1.35f, 4.25f)
+}
+
+private fun isTapInsideBubble(
+    bubble: SpeechBubble,
+    tapX: Float,
+    tapY: Float,
+    hitSlopPx: Float
+): Boolean {
+    val expandedBounds = RectF(bubble.bounds)
+    expandedBounds.inset(-hitSlopPx, -hitSlopPx)
+    if (!expandedBounds.contains(tapX, tapY)) return false
+
+    val mask = bubble.maskBitmap ?: return true
+    if (!bubble.bounds.contains(tapX, tapY)) return true
+
+    val normalizedX = ((tapX - bubble.bounds.left) / bubble.bounds.width()).coerceIn(0f, 0.999f)
+    val normalizedY = ((tapY - bubble.bounds.top) / bubble.bounds.height()).coerceIn(0f, 0.999f)
+    val maskX = (normalizedX * mask.width).toInt().coerceIn(0, mask.width - 1)
+    val maskY = (normalizedY * mask.height).toInt().coerceIn(0, mask.height - 1)
+    return AndroidColor.alpha(mask.getPixel(maskX, maskY)) > 24
+}
+
+private suspend fun renderExpandedBubbleBitmap(
+    document: ReaderDocument,
+    pageIndex: Int,
+    bubbleBounds: RectF,
+    pageWidth: Int,
+    pageHeight: Int,
+    renderScale: Float
+): Bitmap? = withContext(Dispatchers.IO) {
+    if (pageWidth <= 0 || pageHeight <= 0 || bubbleBounds.width() <= 0f || bubbleBounds.height() <= 0f) {
+        return@withContext null
+    }
+
+    document.openPage(pageIndex)?.use { page ->
+        val cropWidth = (bubbleBounds.width() * renderScale).roundToInt().coerceAtLeast(1)
+        val cropHeight = (bubbleBounds.height() * renderScale).roundToInt().coerceAtLeast(1)
+        val bitmap = createBitmap(cropWidth, cropHeight)
+
+        try {
+            page.renderPageBitmap(
+                bitmap = bitmap,
+                startX = (-bubbleBounds.left * renderScale).roundToInt(),
+                startY = (-bubbleBounds.top * renderScale).roundToInt(),
+                drawSizeX = (pageWidth * renderScale).roundToInt().coerceAtLeast(cropWidth),
+                drawSizeY = (pageHeight * renderScale).roundToInt().coerceAtLeast(cropHeight),
+                renderAnnot = true
+            )
+            bitmap
+        } catch (t: Throwable) {
+            bitmap.recycle()
+            Timber.tag("BubbleZoom").w(t, "Failed to render expanded bubble bitmap for page $pageIndex")
+            null
+        }
+    }
+}
+
 object PdfInkGeometry {
     fun calculateFountainPenPoints(
         points: List<PdfPoint>, baseWidth: Float, pageWidth: Float, pageHeight: Float
@@ -394,7 +471,8 @@ internal fun PdfPageComposable(
     searchHighlightMode: SearchHighlightMode = SearchHighlightMode.ALL,
     searchResultToHighlight: SearchResult?,
     ocrHoverHighlights: StableHolder<List<RectF>> = StableHolder(emptyList()),
-    onSingleTap: () -> Unit,
+    onPreSingleTap: ((Offset) -> Boolean)? = null,
+    onSingleTap: (Offset?) -> Unit,
     isProUser: Boolean,
     onShowDictionaryUpsellDialog: () -> Unit,
     onWordSelectedForAiDefinition: (String) -> Unit,
@@ -415,6 +493,7 @@ internal fun PdfPageComposable(
     isVerticalScroll: Boolean = false,
     visualScaleProvider: () -> Float = { 1f },
     clearSelectionTrigger: Long = 0L,
+    resetZoomTrigger: Long = 0L,
     onTtsHighlightCenterCalculated: ((Float) -> Unit)? = null,
     onSearchHighlightCenterCalculated: ((Float) -> Unit)? = null,
     activeTheme: com.aryan.reader.ReaderTheme = com.aryan.reader.ReaderTheme("no_theme", "No Theme", Color.Unspecified, Color.Unspecified, false),
@@ -423,8 +502,8 @@ internal fun PdfPageComposable(
     isEditMode: Boolean = false,
     drawingState: PdfDrawingState? = null,
     pageAnnotations: () -> List<PdfAnnotation> = { emptyList() },
-    onDrawStart: (PdfPoint) -> Unit = {},
-    onDraw: (PdfPoint) -> Unit = {},
+    onDrawStart: (PdfPoint, Boolean) -> Unit = { _, _ -> },
+    onDraw: (PdfPoint, Boolean) -> Unit = { _, _ -> },
     onDrawEnd: () -> Unit = {},
     visibleScreenRect: () -> IntRect? = { null },
     selectedTool: InkType = InkType.PEN,
@@ -441,6 +520,7 @@ internal fun PdfPageComposable(
     isScrollLocked: Boolean = false,
     isVisible: Boolean = true,
     isActivePage: Boolean = true,
+    isBubbleZoomModeActive: Boolean = false,
     isStylusOnlyMode: Boolean = false,
     isAutoScrollPlaying: Boolean = false,
     isHighlighterSnapEnabled: Boolean = false,
@@ -455,7 +535,7 @@ internal fun PdfPageComposable(
     onPaletteClick: (() -> Unit)? = null,
     lockedState: Triple<Float, Float, Float>? = null,
     onZoomAndPanChanged: ((Float, Offset) -> Unit)? = null,
-    onDetectPanels: suspend (Bitmap) -> List<android.graphics.RectF> = { emptyList() },
+    onDetectBubbles: suspend (Int, Bitmap) -> List<SpeechBubble> = { _, _ -> emptyList() },
     onShowPanelPopup: (Bitmap) -> Unit = {}
 ) {
     val pdfDocumentItem = pdfDocument.item
@@ -475,10 +555,7 @@ internal fun PdfPageComposable(
     LocalContext.current
     val viewConfiguration = LocalViewConfiguration.current
     val coroutineScope = rememberCoroutineScope()
-
-    Timber.d(
-        "PdfPageComposable recompose: page=$pageIndex, isScrolling=$isScrolling, visualScale=$visualScaleProvider"
-    )
+    var isStylusEraserOverride by remember { mutableStateOf(false) }
 
     var layoutCoordinates by remember { mutableStateOf<LayoutCoordinates?>(null) }
 
@@ -493,6 +570,7 @@ internal fun PdfPageComposable(
     }
 
     val currentOnSingleTap by rememberUpdatedState(onSingleTap)
+    val currentOnPreSingleTap by rememberUpdatedState(onPreSingleTap)
     val currentOnDoubleTap by rememberUpdatedState(onDoubleTap)
 
     val effectiveScale = if (isZoomEnabled && !isVerticalScroll) scale else externalScale
@@ -618,9 +696,7 @@ internal fun PdfPageComposable(
     }
 
     LaunchedEffect(centeringOffsetX, centeringOffsetY, pageIndex) {
-        Timber.d(
-            "PdfPageComposable Page $pageIndex | Centering Offset: x=$centeringOffsetX, y=$centeringOffsetY"
-        )
+
     }
 
     var showMagnifier by remember { mutableStateOf(false) }
@@ -646,6 +722,132 @@ internal fun PdfPageComposable(
         screenOffset
     }
 
+    var detectedBubbles by remember(targetPageId) { mutableStateOf<List<SpeechBubble>>(emptyList()) }
+    var expandedBubbleIndex by remember(targetPageId) { mutableIntStateOf(-1) }
+    var animatingBubbleIndex by remember(targetPageId) { mutableIntStateOf(-1) }
+    val bubbleExpansionProgress = remember(targetPageId) { Animatable(0f) }
+    var isDetectingBubbles by remember(targetPageId) { mutableStateOf(false) }
+    var expandedBubbleRender by remember(targetPageId) { mutableStateOf<ExpandedBubbleRender?>(null) }
+    val currentDetectedBubbles by rememberUpdatedState(detectedBubbles)
+    val currentExpandedBubbleIndex by rememberUpdatedState(expandedBubbleIndex)
+    val currentBubbleZoomModeActive by rememberUpdatedState(isBubbleZoomModeActive)
+    val bubbleTapSlopPx = with(density) { 18.dp.toPx() }
+
+    LaunchedEffect(expandedBubbleIndex) {
+        if (expandedBubbleIndex != -1) {
+            if (animatingBubbleIndex != -1 && animatingBubbleIndex != expandedBubbleIndex) {
+                bubbleExpansionProgress.animateTo(0f, tween(150))
+            }
+            animatingBubbleIndex = expandedBubbleIndex
+            bubbleExpansionProgress.animateTo(1f, tween(250, easing = androidx.compose.animation.core.FastOutSlowInEasing))
+        } else {
+            bubbleExpansionProgress.animateTo(0f, tween(200, easing = androidx.compose.animation.core.FastOutLinearInEasing))
+            animatingBubbleIndex = -1
+        }
+    }
+
+    LaunchedEffect(
+        isBubbleZoomModeActive,
+        isActivePage,
+        isPdfPage,
+        pdfPageIndex,
+        bitmapState,
+        actualBitmapWidthPx,
+        actualBitmapHeightPx
+    ) {
+        Timber.tag("BubbleZoom").d("LaunchedEffect triggered. modeActive=$isBubbleZoomModeActive, activePage=$isActivePage, hasBitmap=${bitmapState != null}, dims=${actualBitmapWidthPx}x${actualBitmapHeightPx}")
+
+        if (isBubbleZoomModeActive && isActivePage && isPdfPage && bitmapState != null && actualBitmapWidthPx > 0 && actualBitmapHeightPx > 0) {
+            Timber.tag("BubbleZoom").d("Conditions met. Starting detection...")
+            isDetectingBubbles = true
+            try {
+                val rawBubbles = onDetectBubbles(pdfPageIndex, bitmapState!!)
+                Timber.tag("BubbleZoom").d("Detection complete. Found ${rawBubbles.size} raw bubbles.")
+
+                // NEW: Scale bubbles down from render bitmap space to logical screen space
+                val scaleX = actualBitmapWidthPx.toFloat() / bitmapState!!.width.toFloat()
+                val scaleY = actualBitmapHeightPx.toFloat() / bitmapState!!.height.toFloat()
+
+                val logicalBubbles = rawBubbles.map { b ->
+                    b.copy(bounds = android.graphics.RectF(
+                        b.bounds.left * scaleX,
+                        b.bounds.top * scaleY,
+                        b.bounds.right * scaleX,
+                        b.bounds.bottom * scaleY
+                    ))
+                }
+
+                val rowHeight = actualBitmapHeightPx * 0.1f
+                detectedBubbles = logicalBubbles.sortedWith(compareBy<SpeechBubble> { (it.bounds.centerY() / rowHeight).roundToInt() }.thenBy { it.bounds.centerX() })
+                expandedBubbleIndex = -1
+
+                Timber.tag("BubbleZoom").d("Sorted logical bubbles count: ${detectedBubbles.size}")
+            } catch (e: Exception) {
+                Timber.tag("BubbleZoom").e(e, "Bubble detection failed with exception")
+            } finally {
+                isDetectingBubbles = false
+            }
+        } else {
+            Timber.tag("BubbleZoom").d("Conditions NOT met or mode disabled. Clearing bubbles.")
+            detectedBubbles = emptyList()
+            expandedBubbleIndex = -1
+            expandedBubbleRender?.bitmap?.takeUnless { it.isRecycled }?.recycle()
+            expandedBubbleRender = null
+            if (!isBubbleZoomModeActive && scale > 1f && !isVerticalScroll && isZoomEnabled) {
+                coroutineScope.launch {
+                    Animatable(scale).animateTo(1f, tween(300)) {
+                        scale = this.value
+                        offset = Offset.Zero
+                        onScaleChanged(scale)
+                    }
+                }
+            }
+        }
+    }
+
+    LaunchedEffect(
+        animatingBubbleIndex,
+        detectedBubbles,
+        actualBitmapWidthPx,
+        actualBitmapHeightPx,
+        canvasWidthPx.floatValue,
+        canvasHeightPx.floatValue,
+        isBubbleZoomModeActive,
+        isPdfPage,
+        pdfPageIndex
+    ) {
+        val previousRender = expandedBubbleRender
+        expandedBubbleRender = null
+        previousRender?.bitmap?.takeUnless { it.isRecycled }?.recycle()
+
+        if (!isBubbleZoomModeActive || !isPdfPage || animatingBubbleIndex !in detectedBubbles.indices) {
+            return@LaunchedEffect
+        }
+
+        val bubble = detectedBubbles[animatingBubbleIndex]
+        val zoomFactor = computeDynamicBubbleZoomFactor(
+            bubbleBounds = bubble.bounds,
+            viewportWidth = canvasWidthPx.floatValue.coerceAtLeast(actualBitmapWidthPx.toFloat()),
+            viewportHeight = canvasHeightPx.floatValue.coerceAtLeast(actualBitmapHeightPx.toFloat())
+        )
+        val renderScale = (zoomFactor * 1.2f).coerceAtLeast(1.6f)
+        val renderedBubble = renderExpandedBubbleBitmap(
+            document = pdfDocumentItem,
+            pageIndex = pdfPageIndex,
+            bubbleBounds = bubble.bounds,
+            pageWidth = actualBitmapWidthPx,
+            pageHeight = actualBitmapHeightPx,
+            renderScale = renderScale
+        )
+
+        if (renderedBubble != null) {
+            expandedBubbleRender = ExpandedBubbleRender(
+                bitmap = renderedBubble,
+                zoomFactor = zoomFactor
+            )
+        }
+    }
+
     DisposableEffect(Unit) {
         onDispose {
             val currentBitmap = bitmapState
@@ -653,6 +855,7 @@ internal fun PdfPageComposable(
             if (currentBitmap != null && !currentBitmap.isRecycled && currentBitmap !== cachedBitmap) {
                 currentBitmap.recycle()
             }
+            expandedBubbleRender?.bitmap?.takeUnless { it.isRecycled }?.recycle()
         }
     }
 
@@ -1646,6 +1849,32 @@ internal fun PdfPageComposable(
         }
     }
 
+    LaunchedEffect(resetZoomTrigger) {
+        if (resetZoomTrigger != 0L && scale > 1f && isZoomEnabled && !isVerticalScroll && !isScrollLocked) {
+            coroutineScope.launch {
+                val startScale = scale
+                val startOffset = offset
+                Animatable(0f).animateTo(
+                    1f, animationSpec = tween(durationMillis = 300)
+                ) {
+                    val progress = value
+                    scale = androidx.compose.ui.util.lerp(
+                        startScale, 1f, progress
+                    )
+                    offset = androidx.compose.ui.geometry.lerp(
+                        startOffset, Offset.Zero, progress
+                    )
+                    onScaleChanged(scale)
+                }
+                if (scale <= 1.05f) {
+                    scale = 1f
+                    offset = Offset.Zero
+                    onScaleChanged(scale)
+                }
+            }
+        }
+    }
+
     val errorSelection = stringResource(R.string.error_selection)
     val errorOcrSelection = stringResource(R.string.error_ocr_selection)
     val errorProcessingPage = stringResource(R.string.error_processing_page)
@@ -2487,7 +2716,8 @@ internal fun PdfPageComposable(
                 isEditMode,
                 selectedTool,
                 isStylusOnlyMode,
-                userHighlightScreenRects
+                userHighlightScreenRects,
+                bubbleTapSlopPx
             ) {
                 val isTapDetectionAllowed = !isEditMode ||
                         selectedTool == InkType.TEXT ||
@@ -2496,9 +2726,48 @@ internal fun PdfPageComposable(
                 if (!isTapDetectionAllowed) return@pointerInput
 
                 detectTapGestures(onTap = { tapOffset ->
+                    if (currentOnPreSingleTap?.invoke(tapOffset) == true) {
+                        return@detectTapGestures
+                    }
+
                     val tapInContentCoords = screenToContentCoordinates(tapOffset)
                     val tapXInBitmap = tapInContentCoords.x
                     val tapYInBitmap = tapInContentCoords.y
+                    val isWithinContentBounds =
+                        tapXInBitmap in 0f..actualBitmapWidthPx.toFloat() &&
+                            tapYInBitmap in 0f..actualBitmapHeightPx.toFloat()
+
+                    if (!isWithinContentBounds) {
+                        currentOnSingleTap(tapOffset)
+                        return@detectTapGestures
+                    }
+
+                    Timber.tag("BubbleZoom").d("Tap inside bounds. modeActive=$currentBubbleZoomModeActive, detectedBubbles=${currentDetectedBubbles.size}, tapPos=($tapXInBitmap, $tapYInBitmap)")
+
+                    if (currentBubbleZoomModeActive && currentDetectedBubbles.isNotEmpty()) {
+                        val tappedBubbleIndex = currentDetectedBubbles.indexOfFirst { bubble ->
+                            isTapInsideBubble(
+                                bubble = bubble,
+                                tapX = tapXInBitmap,
+                                tapY = tapYInBitmap,
+                                hitSlopPx = bubbleTapSlopPx
+                            )
+                        }
+
+                        Timber.tag("BubbleZoom").d("Tapped bubble index: $tappedBubbleIndex (expandedIndex=$currentExpandedBubbleIndex)")
+
+                        if (tappedBubbleIndex != -1) {
+                            expandedBubbleIndex = if (currentExpandedBubbleIndex == tappedBubbleIndex) {
+                                -1
+                            } else {
+                                tappedBubbleIndex
+                            }
+                            return@detectTapGestures
+                        } else if (currentExpandedBubbleIndex != -1) {
+                            expandedBubbleIndex = -1
+                            return@detectTapGestures
+                        }
+                    }
 
                     coroutineScope.launch {
                         val nativeResult = withContext(Dispatchers.IO) {
@@ -2660,7 +2929,7 @@ internal fun PdfPageComposable(
                                 currentPageRotation,
                             )
                         } else {
-                            currentOnSingleTap()
+                            currentOnSingleTap(tapOffset)
                         }
                     }
                 }, onDoubleTap = { tapOffset ->
@@ -2670,37 +2939,6 @@ internal fun PdfPageComposable(
                             val startScale = scale
                             val targetScale = if (startScale > 1.1f) 1f else 2.5f
 
-                            if (com.aryan.reader.BuildConfig.DEBUG && startScale <= 1.1f && bitmapState != null) {
-                                val tapInContentCoords = screenToContentCoordinates(tapOffset)
-
-                                val ratioX = bitmapState!!.width.toFloat() / actualBitmapWidthPx.toFloat()
-                                val ratioY = bitmapState!!.height.toFloat() / actualBitmapHeightPx.toFloat()
-                                val tapXInBitmap = tapInContentCoords.x * ratioX
-                                val tapYInBitmap = tapInContentCoords.y * ratioY
-
-                                val panels = onDetectPanels(bitmapState!!)
-
-                                val tappedPanel = panels.firstOrNull {
-                                    it.contains(tapXInBitmap, tapYInBitmap)
-                                }
-
-                                if (tappedPanel != null) {
-                                    Timber.d("Popup: Cropping panel $tappedPanel")
-                                    val left = tappedPanel.left.coerceAtLeast(0f).toInt()
-                                    val top = tappedPanel.top.coerceAtLeast(0f).toInt()
-                                    val right = tappedPanel.right.coerceAtMost(bitmapState!!.width.toFloat()).toInt()
-                                    val bottom = tappedPanel.bottom.coerceAtMost(bitmapState!!.height.toFloat()).toInt()
-                                    val width = right - left
-                                    val height = bottom - top
-
-                                    if (width > 0 && height > 0) {
-                                        val cropped = android.graphics.Bitmap.createBitmap(bitmapState!!, left, top, width, height)
-                                        onShowPanelPopup(cropped)
-                                        return@launch
-                                    }
-                                }
-                            }
-
                             val startOffset = offset
                             val targetOffsetUnbounded = if (targetScale <= 1.1f) {
                                 Offset.Zero
@@ -3017,12 +3255,20 @@ internal fun PdfPageComposable(
                             return@awaitEachGesture
                         }
 
+                        val buttons = currentEvent.buttons
+                        Timber.tag("StylusEraserDiagnostic").d(
+                            "Page $pageIndex | Type: ${down.type} | isPrimary: ${buttons.isPrimaryPressed} | isSecondary: ${buttons.isSecondaryPressed} | isTertiary: ${buttons.isTertiaryPressed} | buttonsString: $buttons"
+                        )
+
+                        val isEraserOverride = down.type == PointerType.Eraser || (down.type == PointerType.Stylus && currentEvent.buttons.isSecondaryPressed)
+                        isStylusEraserOverride = isEraserOverride
+
                         val dragPointerId = down.id
                         val startPos = down.position
                         var dragStarted = false
                         val touchSlop = viewConfiguration.touchSlop
 
-                        if (selectedTool == InkType.ERASER) {
+                        if (selectedTool == InkType.ERASER || isEraserOverride) {
                             eraserPosition = down.position
                         }
 
@@ -3034,6 +3280,7 @@ internal fun PdfPageComposable(
                                     drawingState?.onDrawCancel()
                                 }
                                 eraserPosition = null
+                                isStylusEraserOverride = false
                                 return@awaitEachGesture
                             }
 
@@ -3051,12 +3298,13 @@ internal fun PdfPageComposable(
                                     val normY =
                                         (contentPos.y / actualBitmapHeightPx).coerceIn(0f, 1f)
 
-                                    onDrawStart(PdfPoint(normX, normY))
+                                    onDrawStart(PdfPoint(normX, normY), isEraserOverride)
                                     onDrawEnd()
                                 } else {
                                     onDrawEnd()
                                 }
                                 eraserPosition = null
+                                isStylusEraserOverride = false
                                 return@awaitEachGesture
                             }
 
@@ -3077,7 +3325,7 @@ internal fun PdfPageComposable(
                                                 0f, 1f
                                             )
                                         onDrawStart(
-                                            PdfPoint(startNormX, startNormY)
+                                            PdfPoint(startNormX, startNormY), isEraserOverride
                                         )
 
                                         val currContentPos = screenToContentCoordinates(
@@ -3091,9 +3339,9 @@ internal fun PdfPageComposable(
                                             (currContentPos.y / actualBitmapHeightPx).coerceIn(
                                                 0f, 1f
                                             )
-                                        onDraw(PdfPoint(currNormX, currNormY))
+                                        onDraw(PdfPoint(currNormX, currNormY), isEraserOverride)
 
-                                        if (selectedTool == InkType.ERASER) {
+                                        if (selectedTool == InkType.ERASER || isEraserOverride) {
                                             eraserPosition = change.position
                                         }
                                         change.consume()
@@ -3106,9 +3354,9 @@ internal fun PdfPageComposable(
                                         (currContentPos.x / actualBitmapWidthPx).coerceIn(0f, 1f)
                                     val currNormY =
                                         (currContentPos.y / actualBitmapHeightPx).coerceIn(0f, 1f)
-                                    onDraw(PdfPoint(currNormX, currNormY))
+                                    onDraw(PdfPoint(currNormX, currNormY), isEraserOverride)
 
-                                    if (selectedTool == InkType.ERASER) {
+                                    if (selectedTool == InkType.ERASER || isEraserOverride) {
                                         eraserPosition = change.position
                                     }
                                     change.consume()
@@ -3118,6 +3366,7 @@ internal fun PdfPageComposable(
                     }
                 } finally {
                     eraserPosition = null
+                    isStylusEraserOverride = false
                 }
             }, contentAlignment = Alignment.Center
     ) {
@@ -3230,10 +3479,6 @@ internal fun PdfPageComposable(
                 offset = Offset.Zero
                 onScaleChanged(1f)
             }
-
-            Timber.d(
-                "PdfPageComposable Page $pageIndex initialized/resized/locked. scale=$scale, offset=$offset"
-            )
         }
 
         LaunchedEffect(
@@ -3386,15 +3631,8 @@ internal fun PdfPageComposable(
                 val viewContainerHeightPx =
                     with(density) { currentContainerMaxHeight.toPx().toInt() }
 
-                Timber.d(
-                    "PdfPageComposable Page $pageIndex | viewContainerPx: ${viewContainerWidthPx}x${viewContainerHeightPx}"
-                )
-
                 if (viewContainerWidthPx <= 0 || viewContainerHeightPx <= 0) {
                     if (bitmapState == null) isLoadingPage = true
-                    Timber.d(
-                        "PdfPageComposable: viewContainer dimensions invalid ($viewContainerWidthPx x $viewContainerHeightPx), waiting."
-                    )
                     return@LaunchedEffect
                 }
 
@@ -3948,6 +4186,7 @@ internal fun PdfPageComposable(
                         isEditMode = isEditMode,
                         selectedTool = selectedTool,
                         eraserPosition = eraserPosition,
+                        isStylusEraserOverride = isStylusEraserOverride,
                         activeToolThickness = activeToolThickness,
                         richTextController = richTextController,
                         textBoxes = textBoxes,
@@ -3960,7 +4199,14 @@ internal fun PdfPageComposable(
                         onDragPageTurn = onDragPageTurn,
                         draggingBoxId = draggingBoxId,
                         customHighlightColors = customHighlightColors,
-                        onPaletteClick = onPaletteClick
+                        onPaletteClick = onPaletteClick,
+                        isBubbleZoomModeActive = isBubbleZoomModeActive,
+                        isActivePage = isActivePage,
+                        isDetectingBubbles = isDetectingBubbles,
+                        detectedBubbles = detectedBubbles,
+                        animatingBubbleIndex = animatingBubbleIndex,
+                        bubbleExpansionProgress = bubbleExpansionProgress.value,
+                        expandedBubbleRender = expandedBubbleRender
                     )
                 }
 
@@ -4080,15 +4326,10 @@ private fun PdfBitmapLayer(
 
                                 if (excludeImages && colorFilter != null && imageRects.isNotEmpty()) {
                                     imageRects.forEach { imgRect ->
-                                        val scaledImgRectLeft = (imgRect.left * effectiveScale).roundToInt()
-                                        val scaledImgRectTop = (imgRect.top * effectiveScale).roundToInt()
-                                        val scaledImgRectRight = (imgRect.right * effectiveScale).roundToInt()
-                                        val scaledImgRectBottom = (imgRect.bottom * effectiveScale).roundToInt()
-
-                                        val intersectLeft = max(scaledImgRectLeft, tile.renderRect.left)
-                                        val intersectTop = max(scaledImgRectTop, tile.renderRect.top)
-                                        val intersectRight = min(scaledImgRectRight, tile.renderRect.right)
-                                        val intersectBottom = min(scaledImgRectBottom, tile.renderRect.bottom)
+                                        val intersectLeft = max(imgRect.left, tile.renderRect.left)
+                                        val intersectTop = max(imgRect.top, tile.renderRect.top)
+                                        val intersectRight = min(imgRect.right, tile.renderRect.right)
+                                        val intersectBottom = min(imgRect.bottom, tile.renderRect.bottom)
 
                                         val iw = intersectRight - intersectLeft
                                         val ih = intersectBottom - intersectTop
@@ -4151,7 +4392,6 @@ private fun PdfHighlightsLayer(
     selectionHighlightColor: Color,
     customHighlightColors: Map<PdfHighlightColor, Color> = emptyMap()
 ) {
-    Timber.d("PdfHighlightsLayer Recompose")
     Canvas(modifier = Modifier
         .fillMaxSize()
         .graphicsLayer()) {
@@ -4751,6 +4991,7 @@ private fun PdfPageRenderer(
     isEditMode: Boolean,
     selectedTool: InkType,
     eraserPosition: Offset?,
+    isStylusEraserOverride: Boolean,
     richTextController: RichTextController?,
     textBoxes: List<PdfTextBox>,
     selectedTextBoxId: String?,
@@ -4769,6 +5010,13 @@ private fun PdfPageRenderer(
     onTts: (Int, Int) -> Unit,
     activeToolThickness: Float,
     onNote: (String?) -> Unit,
+    isBubbleZoomModeActive: Boolean = false,
+    isActivePage: Boolean = true,
+    isDetectingBubbles: Boolean = false,
+    detectedBubbles: List<SpeechBubble> = emptyList(),
+    animatingBubbleIndex: Int = -1,
+    bubbleExpansionProgress: Float = 0f,
+    expandedBubbleRender: ExpandedBubbleRender? = null
 ) {
     Box(modifier = Modifier.fillMaxSize()) {
         Box(
@@ -4976,7 +5224,7 @@ private fun PdfPageRenderer(
 
         val teardropPainter = painterResource(id = R.drawable.teardrop)
 
-        if (isEditMode && selectedTool == InkType.ERASER && eraserPosition != null) {
+        if (isEditMode && (selectedTool == InkType.ERASER || isStylusEraserOverride) && eraserPosition != null) {
             Canvas(modifier = Modifier.fillMaxSize()) {
                 val radiusPx = if (activeToolThickness > 0f && staticData.targetWidth > 0) {
                     activeToolThickness * staticData.targetWidth * scale // Calculate dynamic size based on tool settings scale
@@ -5203,6 +5451,150 @@ private fun PdfPageRenderer(
         if (isPerformingOcr && ocrRipplePos != null) {
             OcrProcessingIndicator(position = ocrRipplePos)
         }
+
+        if (isBubbleZoomModeActive && isActivePage) {
+            if (isDetectingBubbles) {
+                androidx.compose.material3.CircularProgressIndicator(
+                    modifier = Modifier.align(Alignment.Center)
+                )
+            } else if (detectedBubbles.isNotEmpty()) {
+                Canvas(modifier = Modifier.fillMaxSize().zIndex(20f)) {
+                    // Draw shadow-like hints for unexpanded bubbles
+                    detectedBubbles.forEachIndexed { index, bubble ->
+                        val hintAlpha = if (index == animatingBubbleIndex) 0.35f * (1f - bubbleExpansionProgress) else 0.35f
+                        if (hintAlpha > 0f) {
+                            val left = bubble.bounds.left + staticData.centeringOffsetX
+                            val top = bubble.bounds.top + staticData.centeringOffsetY
+                            val width = bubble.bounds.width()
+                            val height = bubble.bounds.height()
+
+                            if (bubble.maskBitmap != null) {
+                                drawImage(
+                                    image = bubble.maskBitmap.asImageBitmap(),
+                                    dstOffset = IntOffset(left.toInt(), top.toInt()),
+                                    dstSize = IntSize(width.toInt(), height.toInt()),
+                                    colorFilter = ColorFilter.tint(Color.Black.copy(alpha = hintAlpha)),
+                                    filterQuality = androidx.compose.ui.graphics.FilterQuality.High
+                                )
+                            } else {
+                                drawRoundRect(
+                                    color = Color.Black.copy(alpha = hintAlpha),
+                                    topLeft = Offset(left, top),
+                                    size = Size(width, height),
+                                    cornerRadius = androidx.compose.ui.geometry.CornerRadius(24f, 24f)
+                                )
+                            }
+                        }
+                    }
+
+                    if (animatingBubbleIndex in detectedBubbles.indices && staticData.bitmap.item != null && bubbleExpansionProgress > 0f) {
+                        val bubble = detectedBubbles[animatingBubbleIndex]
+                        val left = bubble.bounds.left + staticData.centeringOffsetX
+                        val top = bubble.bounds.top + staticData.centeringOffsetY
+                        val logicalWidth = bubble.bounds.width()
+                        val logicalHeight = bubble.bounds.height()
+                        val pivotX = left + logicalWidth / 2f
+                        val pivotY = top + logicalHeight / 2f
+                        val targetZoomFactor = expandedBubbleRender?.zoomFactor ?: computeDynamicBubbleZoomFactor(
+                            bubbleBounds = bubble.bounds,
+                            viewportWidth = staticData.canvasWidth,
+                            viewportHeight = staticData.canvasHeight
+                        )
+                        val zoomFactor = androidx.compose.ui.util.lerp(1f, targetZoomFactor, bubbleExpansionProgress)
+
+                        withTransform({
+                            scale(zoomFactor, zoomFactor, Offset(pivotX, pivotY))
+                        }) {
+                            val dstOffset = IntOffset(left.toInt(), top.toInt())
+                            val dstSize = IntSize(logicalWidth.toInt(), logicalHeight.toInt())
+
+                            val renderScaleX = staticData.bitmap.item.width.toFloat() / staticData.targetWidth.toFloat()
+                            val renderScaleY = staticData.bitmap.item.height.toFloat() / staticData.targetHeight.toFloat()
+
+                            val srcOffset = IntOffset(
+                                (bubble.bounds.left * renderScaleX).toInt(),
+                                (bubble.bounds.top * renderScaleY).toInt()
+                            )
+                            val srcSize = IntSize(
+                                (logicalWidth * renderScaleX).toInt(),
+                                (logicalHeight * renderScaleY).toInt()
+                            )
+
+                            if (bubble.maskBitmap != null) {
+                                drawImage(
+                                    image = bubble.maskBitmap.asImageBitmap(),
+                                    dstOffset = IntOffset(left.toInt() + 12, top.toInt() + 12),
+                                    dstSize = dstSize,
+                                    colorFilter = ColorFilter.tint(Color.Black.copy(alpha = 0.5f * bubbleExpansionProgress)),
+                                    filterQuality = androidx.compose.ui.graphics.FilterQuality.High
+                                )
+                            } else {
+                                drawRoundRect(
+                                    color = Color.Black.copy(alpha = 0.5f * bubbleExpansionProgress),
+                                    topLeft = Offset(left + 12f, top + 12f),
+                                    size = Size(logicalWidth, logicalHeight),
+                                    cornerRadius = androidx.compose.ui.geometry.CornerRadius(24f, 24f)
+                                )
+                            }
+
+                            if (bubble.maskBitmap != null) {
+                                val rect = androidx.compose.ui.geometry.Rect(
+                                    dstOffset.x.toFloat(),
+                                    dstOffset.y.toFloat(),
+                                    dstOffset.x.toFloat() + dstSize.width,
+                                    dstOffset.y.toFloat() + dstSize.height
+                                )
+                                drawContext.canvas.saveLayer(rect, androidx.compose.ui.graphics.Paint())
+                                drawImage(
+                                    image = (expandedBubbleRender?.bitmap ?: staticData.bitmap.item).asImageBitmap(),
+                                    srcOffset = if (expandedBubbleRender != null) IntOffset.Zero else srcOffset,
+                                    srcSize = if (expandedBubbleRender != null) {
+                                        IntSize(
+                                            expandedBubbleRender.bitmap.width,
+                                            expandedBubbleRender.bitmap.height)
+                                    } else {
+                                        srcSize
+                                    },
+                                    dstOffset = dstOffset,
+                                    dstSize = dstSize,
+                                    filterQuality = androidx.compose.ui.graphics.FilterQuality.High
+                                )
+                                drawImage(
+                                    image = bubble.maskBitmap.asImageBitmap(),
+                                    dstOffset = dstOffset,
+                                    dstSize = dstSize,
+                                    blendMode = BlendMode.DstIn,
+                                    filterQuality = androidx.compose.ui.graphics.FilterQuality.High
+                                )
+                                drawContext.canvas.restore()
+                            } else {
+                                clipRect(left, top, left + logicalWidth, top + logicalHeight) {
+                                    drawImage(
+                                        image = (expandedBubbleRender?.bitmap ?: staticData.bitmap.item).asImageBitmap(),
+                                        srcOffset = if (expandedBubbleRender != null) IntOffset.Zero else srcOffset,
+                                        srcSize = if (expandedBubbleRender != null) {
+                                            IntSize(
+                                                expandedBubbleRender.bitmap.width,
+                                                expandedBubbleRender.bitmap.height)
+                                        } else {
+                                            srcSize
+                                        },
+                                        dstOffset = dstOffset,
+                                        dstSize = dstSize
+                                    )
+                                }
+                                drawRect(
+                                    color = Color.White.copy(alpha = 0.5f * bubbleExpansionProgress),
+                                    topLeft = Offset(left, top),
+                                    size = Size(logicalWidth, logicalHeight),
+                                    style = Stroke(width = 4f)
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+        }
     }
 }
 
@@ -5409,4 +5801,4 @@ private fun getNativePointer(obj: Any): Long {
     } catch (_: Exception) {}
 
     return 0L
-}
+}

app/src/main/java/com/aryan/reader/pdf/PdfPreferences.kt

@@ -47,6 +47,7 @@ enum class PdfReaderTool(val title: String, val category: String) {
     THEME("Theme Settings", "Top Bar"),
     LOCK_PANNING("Lock Panning", "Top Bar"),
     VISUAL_OPTIONS("Visual Options", "Overflow Menu"),
+    TAP_TO_TURN("Tap to Turn Pages", "Overflow Menu"),
     FULL_SCREEN("Full Screen", "Top Bar"),
     SLIDER("Navigation Slider", "Bottom Bar"),
     TOC("Sidebar", "Bottom Bar"),
@@ -370,4 +371,4 @@ internal fun savePdfDarkMode(context: Context, isDark: Boolean) {
 internal fun loadPdfDarkMode(context: Context): Boolean {
     val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
     return prefs.getBoolean(PDF_DARK_MODE_KEY, false)
-}
+}

app/src/main/java/com/aryan/reader/pdf/PdfTocAndBookmarks.kt

@@ -1,229 +0,0 @@
-package com.aryan.reader.pdf
-
-import androidx.compose.animation.animateColorAsState
-import androidx.compose.foundation.background
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.heightIn
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
-import androidx.compose.material.icons.filled.KeyboardArrowDown
-import androidx.compose.material3.Icon
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.style.TextOverflow
-import androidx.compose.ui.unit.dp
-import io.legere.pdfiumandroid.api.Bookmark
-import io.legere.pdfiumandroid.suspend.PdfDocumentKt
-import org.json.JSONArray
-import timber.log.Timber
-
-private const val MAX_FIXED_RECURSION = 128
-
-internal data class PdfBookmark(val pageIndex: Int, val title: String, val totalPages: Int)
-
-internal data class TocEntry(val title: String, val pageIndex: Int, val nestLevel: Int)
-
-/**
- * Patches the library bug where siblings are truncated due to depth-state leakage.
- */
-suspend fun PdfDocumentKt.getFixedTableOfContents(): List<Bookmark> {
-    val tag = "PdfTocFix"
-    Timber.tag(tag).i("Starting Pure Reflection Traversal...")
-
-    return try {
-        // 1. Get the 'document' field (PdfDocumentU) from PdfDocumentKt
-        val documentField = PdfDocumentKt::class.java.getDeclaredField("document").apply { isAccessible = true }
-        val docUInstance = documentField.get(this) ?: return getTableOfContents()
-
-        // 2. Get the 'nativeDocument' field from PdfDocumentU
-        val nativeDocField = docUInstance.javaClass.getDeclaredField("nativeDocument").apply { isAccessible = true }
-        val nativeDocInstance = nativeDocField.get(docUInstance) ?: return getTableOfContents()
-
-        // 3. Get the native pointer (long) from PdfDocumentU
-        val ptrField = docUInstance.javaClass.getDeclaredField("mNativeDocPtr").apply { isAccessible = true }
-        val mNativeDocPtr = ptrField.get(docUInstance) as Long
-
-        // 4. Look up native methods using primitive 'long' types (mandatory for JNI)
-        val nClass = nativeDocInstance.javaClass
-        val lp = Long::class.javaPrimitiveType!! // Shorthand for 'long'
-
-        val getTitleM = nClass.getMethod("getBookmarkTitle", lp)
-        val getDestIdxM = nClass.getMethod("getBookmarkDestIndex", lp, lp)
-        val getFirstChildM = nClass.getMethod("getFirstChildBookmark", lp, lp)
-        val getSiblingM = nClass.getMethod("getSiblingBookmark", lp, lp)
-
-        val topLevel = mutableListOf<Bookmark>()
-        val visited = mutableSetOf<Long>()
-
-        /**
-         * Corrected traversal: Iterative for siblings, recursive for children.
-         */
-        fun walk(parentList: MutableList<Bookmark>, startPtr: Long, level: Int) {
-            var currentPtr = startPtr
-            var itemIndex = 0
-
-            while (currentPtr != 0L) {
-                if (visited.contains(currentPtr)) break
-                visited.add(currentPtr)
-
-                val title = getTitleM.invoke(nativeDocInstance, currentPtr) as? String ?: "Untitled"
-                val pageIdx = getDestIdxM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
-
-                Timber.tag(tag).v("Lvl $level | Item $itemIndex | Ptr: 0x${java.lang.Long.toHexString(currentPtr)} | $title")
-
-                val bookmark = Bookmark().apply {
-                    this.mNativePtr = currentPtr
-                    this.title = title
-                    this.pageIdx = pageIdx
-                }
-                parentList.add(bookmark)
-
-                // Recursive dive into children
-                val firstChild = getFirstChildM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
-                if (firstChild != 0L && level < MAX_FIXED_RECURSION) {
-                    walk(bookmark.children, firstChild, level + 1)
-                }
-
-                // Iterative move to next sibling
-                currentPtr = getSiblingM.invoke(nativeDocInstance, mNativeDocPtr, currentPtr) as Long
-                itemIndex++
-            }
-        }
-
-        // 5. Start from the root (Pass 0L as primitive long)
-        val firstRoot = getFirstChildM.invoke(nativeDocInstance, mNativeDocPtr, 0L) as Long
-        if (firstRoot != 0L) {
-            walk(topLevel, firstRoot, 0)
-        }
-
-        if (topLevel.isEmpty()) {
-            Timber.tag(tag).w("No items found, falling back to library.")
-            getTableOfContents()
-        } else {
-            Timber.tag(tag).i("TOC Successfully Patched! Nodes: ${visited.size}")
-            topLevel
-        }
-    } catch (e: Exception) {
-        Timber.tag(tag).e(e, "Reflection traversal critical error.")
-        this.getTableOfContents()
-    }
-}
-
-internal fun flattenToc(bookmarks: List<Bookmark>, level: Int = 0): List<TocEntry> {
-    Timber.tag("PdfTocDebug").d("Processing level $level with ${bookmarks.size} items")
-    val entries = mutableListOf<TocEntry>()
-    for ((index, bookmark) in bookmarks.withIndex()) {
-        val title = bookmark.title ?: "Untitled Chapter"
-        val childCount = bookmark.children.size
-
-        Timber.tag("PdfTocDebug").d(
-            "Lvl $level | Item $index: \"$title\" (Page: ${bookmark.pageIdx}) | Children: $childCount"
-        )
-
-        entries.add(
-            TocEntry(
-                title = title,
-                pageIndex = bookmark.pageIdx.toInt(),
-                nestLevel = level
-            )
-        )
-
-        if (childCount > 0) {
-            Timber.tag("PdfTocDebug").v("Entering children of \"$title\"")
-            entries.addAll(flattenToc(bookmark.children, level + 1))
-            Timber.tag("PdfTocDebug").v("Returned to Lvl $level from \"$title\"")
-        }
-    }
-    return entries
-}
-
-internal fun loadPdfBookmarksFromJson(bookmarksJson: String?): Set<PdfBookmark> {
-    if (bookmarksJson.isNullOrBlank()) return emptySet()
-    return try {
-        val jsonArray = JSONArray(bookmarksJson)
-        (0 until jsonArray.length()).mapNotNull { i ->
-            try {
-                val json = jsonArray.getJSONObject(i)
-                PdfBookmark(
-                    pageIndex = json.getInt("pageIndex"),
-                    title = json.getString("title"),
-                    totalPages = json.getInt("totalPages")
-                )
-            } catch (e: Exception) {
-                Timber.e(e, "Failed to parse bookmark from JSON object")
-                null
-            }
-        }.toSet()
-    } catch (e: Exception) {
-        Timber.e(e, "Failed to parse bookmarks from JSON string: $bookmarksJson")
-        emptySet()
-    }
-}
-
-@Composable
-internal fun PdfTocTreeItem(
-    label: String,
-    nestLevel: Int,
-    isExpanded: Boolean,
-    hasChildren: Boolean,
-    isCurrent: Boolean,
-    onToggleExpand: () -> Unit,
-    onClick: () -> Unit
-) {
-    val backgroundColor by animateColorAsState(
-        targetValue = if (isCurrent) MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.2f) else Color.Transparent,
-        label = "TocItemBackground"
-    )
-
-    val contentColor = if (isCurrent) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurface
-
-    Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .heightIn(min = 48.dp)
-            .background(backgroundColor)
-            .clickable(onClick = onClick)
-            .padding(vertical = 4.dp),
-        verticalAlignment = Alignment.CenterVertically
-    ) {
-        Spacer(modifier = Modifier.width((16 * nestLevel).dp))
-
-        Box(
-            modifier = Modifier
-                .size(40.dp)
-                .clickable(enabled = hasChildren, onClick = onToggleExpand),
-            contentAlignment = Alignment.Center
-        ) {
-            if (hasChildren) {
-                Icon(
-                    imageVector = if (isExpanded) Icons.Default.KeyboardArrowDown else Icons.AutoMirrored.Filled.KeyboardArrowRight,
-                    contentDescription = if (isExpanded) "Collapse" else "Expand",
-                    tint = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-        }
-
-        Text(
-            text = label,
-            style = if (nestLevel == 0) MaterialTheme.typography.bodyLarge else MaterialTheme.typography.bodyMedium,
-            fontWeight = if (isCurrent) FontWeight.Bold else if (nestLevel == 0) FontWeight.SemiBold else FontWeight.Normal,
-            color = contentColor,
-            maxLines = 2,
-            overflow = TextOverflow.Ellipsis,
-            modifier = Modifier.weight(1f).padding(end = 16.dp)
-        )
-    }
-}

app/src/main/java/com/aryan/reader/pdf/PdfToolbars.kt

@@ -18,6 +18,7 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.Undo
 import androidx.compose.material.icons.filled.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
@@ -33,6 +34,7 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.unit.sp
 import com.aryan.reader.BuildConfig
 import com.aryan.reader.FileType
 import com.aryan.reader.R
@@ -81,6 +83,8 @@ internal fun PdfTopBar(
     onShowCustomizeTools: () -> Unit,
     onShowOcrLanguage: () -> Unit,
     onShowVisualOptions: () -> Unit,
+    tapToNavigateEnabled: Boolean,
+    onToggleTapToNavigate: () -> Unit,
     onChangeDisplayMode: (DisplayMode) -> Unit,
     onToggleKeepScreenOn: () -> Unit,
     onStartAutoScroll: () -> Unit,
@@ -94,7 +98,8 @@ internal fun PdfTopBar(
     onPrint: () -> Unit,
     onTabClick: (String) -> Unit,
     onTabClose: (String) -> Unit,
-    onNewTabClick: () -> Unit
+    onNewTabClick: () -> Unit,
+    onGenerateDemoAnnotations: () -> Unit
 ) {
     AnimatedVisibility(
         visible = showStandardBars,
@@ -179,6 +184,9 @@ internal fun PdfTopBar(
                         }
 
                         if (BuildConfig.DEBUG) {
+                            TooltipIconButton(text = "Demo Annotations", onClick = onGenerateDemoAnnotations) {
+                                Icon(Icons.Default.BugReport, contentDescription = "Generate Demo Annotations", tint = MaterialTheme.colorScheme.secondary)
+                            }
                             TooltipIconButton(text = stringResource(R.string.pen_playground), onClick = onShowPenPlayground) {
                                 Icon(Icons.Default.Star, contentDescription = "Open Pen Playground", tint = MaterialTheme.colorScheme.primary)
                             }
@@ -238,6 +246,26 @@ internal fun PdfTopBar(
                                     HorizontalDivider()
                                 }
 
+                                if (!hiddenTools.contains(PdfReaderTool.TAP_TO_TURN.name)) {
+                                    DropdownMenuItem(
+                                        text = { Text(stringResource(R.string.menu_tap_to_turn_pages)) },
+                                        enabled = displayMode == DisplayMode.PAGINATION,
+                                        onClick = {
+                                            onToggleTapToNavigate()
+                                            showMoreMenu = false
+                                        },
+                                        trailingIcon = {
+                                            if (tapToNavigateEnabled) {
+                                                Icon(
+                                                    Icons.Filled.Check,
+                                                    contentDescription = stringResource(R.string.content_desc_enabled)
+                                                )
+                                            }
+                                        }
+                                    )
+                                    HorizontalDivider()
+                                }
+
                                 if (!hiddenTools.contains(PdfReaderTool.KEEP_SCREEN_ON.name)) {
                                     DropdownMenuItem(
                                         text = { Text(stringResource(R.string.menu_keep_screen_on)) },
@@ -433,13 +461,17 @@ fun PdfBottomBar(
     isEditMode: Boolean,
     isTtsSessionActive: Boolean,
     ttsErrorMessage: String?,
+    jumpBackPage: Int?,
+    onJumpBack: () -> Unit,
     onShowSlider: () -> Unit,
     onShowToc: () -> Unit,
     onSearchClick: () -> Unit,
     onToggleHighlights: () -> Unit,
     onShowAiHub: () -> Unit,
     onToggleEditMode: () -> Unit,
-    onToggleTts: () -> Unit
+    onToggleTts: () -> Unit,
+    isBubbleZoomModeActive: Boolean,
+    onToggleBubbleZoom: () -> Unit
 ) {
     AnimatedVisibility(
         visible = showStandardBars && !searchStateActive,
@@ -456,8 +488,35 @@ fun PdfBottomBar(
             Row(
                 modifier = Modifier.fillMaxWidth().padding(bottom = bottomBarPadding).height(56.dp).padding(horizontal = 8.dp).horizontalScroll(bottomBarScrollState),
                 verticalAlignment = Alignment.CenterVertically,
-                horizontalArrangement = Arrangement.spacedBy(12.dp)
+                horizontalArrangement = Arrangement.SpaceEvenly
             ) {
+                if (jumpBackPage != null) {
+                    TooltipIconButton(
+                        text = "Jump Back to Page ${jumpBackPage + 1}",
+                        description = "Return to previous page",
+                        onClick = onJumpBack
+                    ) {
+                        Column(
+                            horizontalAlignment = Alignment.CenterHorizontally,
+                            verticalArrangement = Arrangement.Center
+                        ) {
+                            Icon(
+                                Icons.AutoMirrored.Filled.Undo,
+                                contentDescription = "Jump Back",
+                                tint = MaterialTheme.colorScheme.primary,
+                                modifier = Modifier.size(16.dp)
+                            )
+                            Text(
+                                text = "${jumpBackPage + 1}",
+                                fontSize = 10.sp,
+                                lineHeight = 10.sp,
+                                fontWeight = FontWeight.Bold,
+                                color = MaterialTheme.colorScheme.primary
+                            )
+                        }
+                    }
+                }
+
                 if (!hiddenTools.contains(PdfReaderTool.SLIDER.name)) {
                     TooltipIconButton(
                         text = stringResource(R.string.tooltip_slider),
@@ -532,10 +591,24 @@ fun PdfBottomBar(
                     }
                 }
 
+                if (BuildConfig.FLAVOR != "oss") {
+                    TooltipIconButton(
+                        text = if (isBubbleZoomModeActive) "Exit Smart Zoom" else "Smart Comic Zoom",
+                        description = "Toggle Smart Comic Zoom",
+                        onClick = onToggleBubbleZoom
+                    ) {
+                        Icon(
+                            painterResource(R.drawable.comic_bubble),
+                            contentDescription = "Smart Comic Zoom",
+                            tint = if (isBubbleZoomModeActive) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+
                 ttsErrorMessage?.let {
                     Text(it, color = MaterialTheme.colorScheme.error, style = MaterialTheme.typography.bodySmall, modifier = Modifier.weight(1f).padding(start = 8.dp), maxLines = 2, overflow = TextOverflow.Ellipsis)
                 }
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/pdf/PdfVerticalReader.kt

@@ -23,6 +23,7 @@
 package com.aryan.reader.pdf
 
 import android.annotation.SuppressLint
+import android.graphics.Bitmap
 import android.graphics.RectF
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateColorAsState
@@ -90,6 +91,9 @@ import androidx.compose.ui.graphics.TransformOrigin
 import androidx.compose.ui.graphics.drawscope.Stroke
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.pointer.PointerType
+import androidx.compose.ui.input.pointer.isPrimaryPressed
+import androidx.compose.ui.input.pointer.isSecondaryPressed
+import androidx.compose.ui.input.pointer.isTertiaryPressed
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.input.pointer.positionChanged
 import androidx.compose.ui.input.pointer.util.VelocityTracker
@@ -108,6 +112,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
 import com.aryan.reader.SearchResult
+import com.aryan.reader.ml.SpeechBubble
 import com.aryan.reader.pdf.data.PdfAnnotation
 import com.aryan.reader.pdf.data.PdfTextBox
 import com.aryan.reader.pdf.data.VirtualPage
@@ -217,8 +222,8 @@ internal fun PdfVerticalReader(
     isEditMode: Boolean = false,
     allAnnotations: () -> Map<Int, List<PdfAnnotation>> = { emptyMap() },
     drawingState: PdfDrawingState,
-    onDrawStart: (Int, PdfPoint) -> Unit,
-    onDraw: (Int, PdfPoint) -> Unit,
+    onDrawStart: (Int, PdfPoint, Boolean) -> Unit,
+    onDraw: (Int, PdfPoint, Boolean) -> Unit,
     onDrawEnd: () -> Unit,
     onOcrModelDownloading: () -> Unit = {},
     selectedTool: InkType,
@@ -247,7 +252,10 @@ internal fun PdfVerticalReader(
     customHighlightColors: Map<PdfHighlightColor, Color> = emptyMap(),
     onPaletteClick: () -> Unit = {},
     lockedState: Triple<Float, Float, Float>? = null,
-    onZoomAndPanChanged: ((Float, Offset) -> Unit)? = null
+    onZoomAndPanChanged: ((Float, Offset) -> Unit)? = null,
+    resetZoomTrigger: Long = 0L,
+    isBubbleZoomModeActive: Boolean = false,
+    onDetectBubbles: suspend (Int, Bitmap) -> List<SpeechBubble> = { _, _ -> emptyList() }
 ) {
     SideEffect { Timber.tag("PdfDrawPerf").v("LIST: PdfVerticalReader Recomposing.") }
     DisposableEffect(state) {
@@ -260,6 +268,7 @@ internal fun PdfVerticalReader(
         }
     }
     var globalEraserPosition by remember { mutableStateOf<Offset?>(null) }
+    var isStylusEraserOverride by remember { mutableStateOf(false) }
     val isDarkMode = activeTheme.isDark || activeTheme.id == "reverse"
     BoxWithConstraints(modifier = modifier.fillMaxSize(), contentAlignment = Alignment.TopStart) {
         val imeInsets = WindowInsets.ime
@@ -393,18 +402,17 @@ internal fun PdfVerticalReader(
 
                 val zoomedDocHeight = totalDocHeight * savedScale
                 val minPanY = (screenHeight - footerHeightPx - zoomedDocHeight).coerceAtMost(headerHeightPx)
-                val maxPanY = headerHeightPx
 
                 zoomAnimatable.stop()
                 panXAnimatable.stop()
                 panYAnimatable.stop()
 
                 panXAnimatable.updateBounds(minPanX, maxPanX)
-                panYAnimatable.updateBounds(minPanY, maxPanY)
+                panYAnimatable.updateBounds(minPanY, headerHeightPx)
 
                 zoomAnimatable.snapTo(savedScale)
                 panXAnimatable.snapTo(savedPanX)
-                panYAnimatable.snapTo(savedPanY.coerceIn(minPanY, maxPanY))
+                panYAnimatable.snapTo(savedPanY.coerceIn(minPanY, headerHeightPx))
 
                 Timber.tag("PdfLockDiagnostic").d("RESTORE SNAP COMPLETE: Scale=${zoomAnimatable.value}, X=${panXAnimatable.value}, Y=${panYAnimatable.value}")
 
@@ -492,6 +500,65 @@ internal fun PdfVerticalReader(
             return clampValues(targetZoom, targetPanX, targetPanY)
         }
 
+        LaunchedEffect(resetZoomTrigger) {
+            if (resetZoomTrigger != 0L && zoomAnimatable.value > fitZoom && !isScrollLocked) {
+                scope.launch {
+                    zoomAnimatable.stop()
+                    panXAnimatable.stop()
+                    panYAnimatable.stop()
+
+                    val startZoom = zoomAnimatable.value
+                    val startPanX = panXAnimatable.value
+                    val startPanY = panYAnimatable.value
+
+                    val pivotScreenX = screenWidth / 2f
+                    val pivotScreenY = screenHeight / 2f
+
+                    val pivotContentX = (pivotScreenX - startPanX) / startZoom
+                    val pivotContentY = (pivotScreenY - startPanY) / startZoom
+
+                    val rawNextPanX = pivotScreenX - (pivotContentX * fitZoom)
+                    val rawNextPanY = pivotScreenY - (pivotContentY * fitZoom)
+
+                    val (finalZoom, finalX, finalY) = clampCamera(fitZoom, rawNextPanX, rawNextPanY)
+
+                    panXAnimatable.updateBounds(
+                        lowerBound = minOf(panXAnimatable.lowerBound ?: finalX, finalX, startPanX),
+                        upperBound = maxOf(panXAnimatable.upperBound ?: finalX, finalX, startPanX)
+                    )
+                    panYAnimatable.updateBounds(
+                        lowerBound = minOf(panYAnimatable.lowerBound ?: finalY, finalY, startPanY),
+                        upperBound = maxOf(panYAnimatable.upperBound ?: finalY, finalY, startPanY)
+                    )
+
+                    coroutineScope {
+                        launch { zoomAnimatable.animateTo(finalZoom, animationSpec = tween(400, easing = FastOutSlowInEasing)) }
+                        launch { panXAnimatable.animateTo(finalX, animationSpec = tween(400, easing = FastOutSlowInEasing)) }
+                        launch { panYAnimatable.animateTo(finalY, animationSpec = tween(400, easing = FastOutSlowInEasing)) }
+                    }
+
+                    onZoomChange(zoomAnimatable.value)
+
+                    val zoomedDocWidth = screenWidth * finalZoom
+                    val finalMinX: Float
+                    val finalMaxX: Float
+                    if (zoomedDocWidth < screenWidth) {
+                        val centeredX = (screenWidth - zoomedDocWidth) / 2f
+                        finalMinX = centeredX
+                        finalMaxX = centeredX
+                    } else {
+                        finalMinX = -(zoomedDocWidth - screenWidth)
+                        finalMaxX = 0f
+                    }
+                    panXAnimatable.updateBounds(lowerBound = finalMinX, upperBound = finalMaxX)
+
+                    val zDocH = totalDocHeight * finalZoom
+                    val minScrollY = (screenHeight - footerHeightPx - zDocH).coerceAtMost(headerHeightPx)
+                    panYAnimatable.updateBounds(lowerBound = minScrollY, upperBound = headerHeightPx)
+                }
+            }
+        }
+
         LaunchedEffect(
             totalDocHeight, screenHeight, headerHeightPx, footerHeightPx, zoomAnimatable.value, isInteracting, isFlinging, isResizing
         ) {
@@ -920,6 +987,15 @@ internal fun PdfVerticalReader(
                     return@awaitEachGesture
                 }
 
+                val buttons = currentEvent.buttons
+                Timber.tag("StylusEraserDiagnostic").d(
+                    "VerticalReader | Type: ${down.type} | isPrimary: ${buttons.isPrimaryPressed} | isSecondary: ${buttons.isSecondaryPressed} | isTertiary: ${buttons.isTertiaryPressed} | buttonsString: $buttons"
+                )
+
+                val isEraserOverride = down.type == PointerType.Eraser ||
+                        (down.type == PointerType.Stylus && currentEvent.buttons.isSecondaryPressed)
+                isStylusEraserOverride = isEraserOverride
+
                 fun getPageAndPoint(screenOffset: Offset): Pair<Int, PdfPoint>? {
                     val zoom = zoomAnimatable.value
                     val panX = panXAnimatable.value
@@ -943,14 +1019,14 @@ internal fun PdfVerticalReader(
                 var isCanceled = false
 
                 try {
-                    if (selectedTool == InkType.ERASER) {
+                    if (selectedTool == InkType.ERASER || isEraserOverride) {
                         globalEraserPosition = down.position
                     }
 
                     val startData = getPageAndPoint(down.position)
                     if (startData != null) {
                         val (pageIndex, point) = startData
-                        onDrawStart(pageIndex, point)
+                        onDrawStart(pageIndex, point, isEraserOverride)
                         down.consume()
                     }
 
@@ -969,7 +1045,7 @@ internal fun PdfVerticalReader(
                         if (change == null || !change.pressed) break
 
                         if (change.positionChanged()) {
-                            if (selectedTool == InkType.ERASER) {
+                            if (selectedTool == InkType.ERASER || isEraserOverride) {
                                 globalEraserPosition = change.position
                             }
 
@@ -977,11 +1053,11 @@ internal fun PdfVerticalReader(
                             if (dragData != null) {
                                 val (pageIndex, point) = dragData
 
-                                if (pageIndex != lastPageIndex && selectedTool != InkType.ERASER) {
+                                if (pageIndex != lastPageIndex && selectedTool != InkType.ERASER && !isEraserOverride) {
                                     onDrawEnd()
-                                    onDrawStart(pageIndex, point)
+                                    onDrawStart(pageIndex, point, isEraserOverride)
                                 } else {
-                                    onDraw(pageIndex, point)
+                                    onDraw(pageIndex, point, isEraserOverride)
                                 }
                                 lastPageIndex = pageIndex
                             }
@@ -993,6 +1069,7 @@ internal fun PdfVerticalReader(
                         onDrawEnd()
                     }
                     globalEraserPosition = null
+                    isStylusEraserOverride = false
                 }
             }
         }
@@ -1472,16 +1549,20 @@ internal fun PdfVerticalReader(
                                 }
 
                             val onDrawStartLambda = remember(page.index, onDrawStart) {
-                                { point: PdfPoint -> onDrawStart(page.index, point) }
+                                { point: PdfPoint, isEraserOverride: Boolean ->
+                                    onDrawStart(page.index, point, isEraserOverride)
+                                }
                             }
 
                             val currentOnDraw by rememberUpdatedState(onDraw)
                             val onDrawLambda = remember(page.index) {
-                                { point: PdfPoint -> currentOnDraw(page.index, point) }
+                                { point: PdfPoint, isEraserOverride: Boolean ->
+                                    currentOnDraw(page.index, point, isEraserOverride)
+                                }
                             }
 
                             val onSingleTapLambda = remember(onPageClick) {
-                                {
+                                { _: Offset? ->
                                     selectionClearTrigger++
                                     onPageClick()
                                 }
@@ -1759,7 +1840,9 @@ internal fun PdfVerticalReader(
                                             draggingBoxId = null
                                         }
                                     },
-                                    draggingBoxId = draggingBoxId
+                                    draggingBoxId = draggingBoxId,
+                                    isBubbleZoomModeActive = isBubbleZoomModeActive,
+                                    onDetectBubbles = onDetectBubbles
                                 )
                             }
 
@@ -1875,6 +1958,7 @@ internal fun PdfVerticalReader(
             animationSpec = tween(durationMillis = 300),
             label = "scrollbarAlpha"
         )
+        val safeCurrentPage = if (totalPages > 0) state.currentPage.coerceIn(0, totalPages - 1) else 0
 
         val samsungBlue = Color(0xFF4285F4)
         val samsungBlueDark = Color(0xFF1976D2)
@@ -1934,7 +2018,7 @@ internal fun PdfVerticalReader(
                 .alpha(scrollbarAlpha)) {
                 Row(verticalAlignment = Alignment.CenterVertically) {
                     AnimatedVisibility(
-                        visible = isDraggingScrollbar,
+                        visible = isDraggingScrollbar && totalPages > 0,
                         enter = fadeIn() + androidx.compose.animation.slideInHorizontally {
                             it / 2
                         },
@@ -1948,7 +2032,7 @@ internal fun PdfVerticalReader(
                             modifier = Modifier.padding(end = 12.dp)
                         ) {
                             Text(
-                                text = "${state.currentPage + 1}/${totalPages}",
+                                text = "${safeCurrentPage + 1}/$totalPages",
                                 style = MaterialTheme.typography.titleMedium.copy(
                                     fontSize = 16.sp, fontWeight = FontWeight.Bold
                                 ),
@@ -2060,7 +2144,7 @@ internal fun PdfVerticalReader(
             }
         }
 
-        if (isEditMode && selectedTool == InkType.ERASER && globalEraserPosition != null) {
+        if (isEditMode && (selectedTool == InkType.ERASER || isStylusEraserOverride) && globalEraserPosition != null) {
             Canvas(modifier = Modifier.fillMaxSize()) {
                 val pos = globalEraserPosition!!
                 val radiusPx = if (activeToolThickness > 0f) {
@@ -2127,4 +2211,4 @@ internal fun PdfVerticalReader(
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt

@@ -92,6 +92,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.Undo
 import androidx.compose.material.icons.filled.ArrowDownward
 import androidx.compose.material.icons.filled.ArrowUpward
 import androidx.compose.material.icons.filled.Close
@@ -209,11 +210,14 @@ import com.aryan.reader.SearchResult
 import com.aryan.reader.SummarizationResult
 import com.aryan.reader.SummaryCacheManager
 import com.aryan.reader.TtsSettingsSheet
+import com.aryan.reader.ml.SpeechBubble
 import com.aryan.reader.epubreader.AutoScrollControls
 import com.aryan.reader.epubreader.DictionarySettingsDialog
 import com.aryan.reader.epubreader.ExternalDictionaryHelper
 import com.aryan.reader.epubreader.SystemUiMode
 import com.aryan.reader.epubreader.TtsOverlayControls
+import com.aryan.reader.epubreader.loadTapToNavigateSetting
+import com.aryan.reader.epubreader.saveTapToNavigateSetting
 import com.aryan.reader.fetchAiDefinition
 import com.aryan.reader.loadCustomThemes
 import com.aryan.reader.paginatedreader.TtsChunk
@@ -252,6 +256,7 @@ import org.json.JSONObject
 import timber.log.Timber
 import java.io.ByteArrayOutputStream
 import java.io.File
+import java.util.LinkedHashSet
 import java.net.HttpURLConnection
 import java.net.URL
 import kotlin.math.PI
@@ -290,6 +295,7 @@ fun PdfViewerScreen(
     val focusManager = LocalFocusManager.current
     val drawerState = rememberDrawerState(initialValue = DrawerValue.Closed)
     var displayMode by remember { mutableStateOf(loadDisplayMode(context)) }
+    var tapToNavigateEnabled by remember { mutableStateOf(loadTapToNavigateSetting(context)) }
     var showThemePanel by remember { mutableStateOf(false) }
     var currentThemeId by remember { mutableStateOf(loadPdfThemeId(context)) }
     var excludeImages by remember { mutableStateOf(com.aryan.reader.loadExcludeImages(context)) }
@@ -335,9 +341,11 @@ fun PdfViewerScreen(
         savePdfHiddenTools(context, newSet)
     }
 
+    val isOss = BuildConfig.FLAVOR == "oss"
+
     val executeWithOcrCheck = remember(hasSelectedOcrLanguage) {
         { action: () -> Unit ->
-            if (hasSelectedOcrLanguage) {
+            if (isOss || hasSelectedOcrLanguage) {
                 action()
             } else {
                 pendingActionAfterOcrSelection = action
@@ -584,6 +592,9 @@ fun PdfViewerScreen(
     var customHighlightColors by remember { mutableStateOf(loadCustomHighlightColors(context)) }
     var showHighlightColorPicker by remember { mutableStateOf(false) }
     var highlightColorPickerInitialSlot by remember { mutableStateOf(PdfHighlightColor.YELLOW) }
+    var isBubbleZoomModeActive by remember { mutableStateOf(false) }
+    var showBubbleZoomDownloadDialog by remember { mutableStateOf(false) }
+    val bubbleZoomDownloadProgress by viewModel.speechBubbleModelDownloadProgress.collectAsState()
 
     var dockLocation by remember { mutableStateOf(initialDockLocation) }
     var dockOffset by remember { mutableStateOf(initialDockOffset) }
@@ -655,22 +666,11 @@ fun PdfViewerScreen(
         snapPreviewLocation,
         isEditMode,
         isDockDragging,
-        showStandardBars,
         systemUiMode,
         statusBarHeightDp
     ) {
         if (!isEditMode) {
-            var h = 0.dp
-            if (showStandardBars) {
-                h += 56.dp
-            }
-
-            val isStatusBarVisible = systemUiMode == SystemUiMode.DEFAULT || (systemUiMode == SystemUiMode.SYNC && showStandardBars)
-
-            if (isStatusBarVisible) {
-                h += statusBarHeightDp
-            }
-            h
+            0.dp
         } else {
             val isStickyTop = dockLocation == DockLocation.TOP && !isDockDragging
             val isPreviewingTop = snapPreviewLocation == DockLocation.TOP
@@ -686,6 +686,31 @@ fun PdfViewerScreen(
         label = "verticalHeaderHeight"
     )
 
+    val targetTopOverlayInset = remember(
+        showStandardBars,
+        systemUiMode,
+        statusBarHeightDp
+    ) {
+        if (!showStandardBars) {
+            0.dp
+        } else {
+            var inset = 56.dp
+            val isStatusBarVisible =
+                systemUiMode == SystemUiMode.DEFAULT || (systemUiMode == SystemUiMode.SYNC && showStandardBars)
+
+            if (isStatusBarVisible) {
+                inset += statusBarHeightDp
+            }
+            inset
+        }
+    }
+
+    val topOverlayInset by animateDpAsState(
+        targetValue = targetTopOverlayInset,
+        animationSpec = tween(durationMillis = 200),
+        label = "topOverlayInset"
+    )
+
     val verticalFooterHeight by remember(
         dockLocation,
         snapPreviewLocation,
@@ -820,9 +845,155 @@ fun PdfViewerScreen(
             }
         }
     }
-
     var isDocumentReady by remember { mutableStateOf(false) }
 
+    suspend fun renderSpeechBubblePrefetchBitmap(
+        document: ReaderDocument,
+        sourcePageIndex: Int
+    ): Bitmap? = withContext(Dispatchers.IO) {
+        document.openPage(sourcePageIndex)?.use { page ->
+            val pageWidth = page.getPageWidthPoint()
+            val pageHeight = page.getPageHeightPoint()
+            if (pageWidth <= 0 || pageHeight <= 0) {
+                return@withContext null
+            }
+
+            val longEdge = max(pageWidth, pageHeight).toFloat()
+            val targetLongEdge = when (document) {
+                is PdfDocumentWrapper -> 1600f.coerceAtLeast(longEdge)
+                else -> min(longEdge, 1600f)
+            }
+            val renderScale = (targetLongEdge / longEdge).coerceAtLeast(1f)
+            val renderWidth = (pageWidth * renderScale).roundToInt().coerceAtLeast(1)
+            val renderHeight = (pageHeight * renderScale).roundToInt().coerceAtLeast(1)
+            val renderBitmap = Bitmap.createBitmap(renderWidth, renderHeight, Bitmap.Config.ARGB_8888)
+
+            try {
+                page.renderPageBitmap(
+                    bitmap = renderBitmap,
+                    startX = 0,
+                    startY = 0,
+                    drawSizeX = renderWidth,
+                    drawSizeY = renderHeight,
+                    renderAnnot = true
+                )
+                renderBitmap
+            } catch (t: Throwable) {
+                renderBitmap.recycle()
+                Timber.tag("BubbleZoom").w(t, "Failed to render bubble prefetch bitmap for page $sourcePageIndex")
+                null
+            }
+        }
+    }
+
+    fun buildSpeechBubblePrefetchOrder(): List<Int> {
+        if (totalDisplayPages <= 0) return emptyList()
+        val ordered = LinkedHashSet<Int>()
+        ordered += currentPage.coerceIn(0, totalDisplayPages - 1)
+        for (distance in 1 until totalDisplayPages) {
+            val next = currentPage + distance
+            val previous = currentPage - distance
+            if (next in 0 until totalDisplayPages) ordered += next
+            if (previous in 0 until totalDisplayPages) ordered += previous
+        }
+        return ordered.toList()
+    }
+
+    suspend fun detectSpeechBubblesForPage(
+        sourcePageIndex: Int,
+        fallbackBitmap: Bitmap,
+        allowHighQualityFallback: Boolean = true
+    ): List<SpeechBubble> {
+        val document = pdfDocument
+        val shouldUsePrefetchBitmap =
+            allowHighQualityFallback &&
+                document != null &&
+                !viewModel.hasCachedSpeechBubbles(bookId, sourcePageIndex)
+        val detectionBitmap = if (shouldUsePrefetchBitmap) {
+            renderSpeechBubblePrefetchBitmap(document!!, sourcePageIndex) ?: fallbackBitmap
+        } else {
+            fallbackBitmap
+        }
+        val ownsBitmap = detectionBitmap !== fallbackBitmap
+
+        return try {
+            val detected = viewModel.detectSpeechBubblesCached(
+                documentId = bookId,
+                pageIndex = sourcePageIndex,
+                bitmap = detectionBitmap,
+                context = context
+            )
+            if (ownsBitmap) {
+                viewModel.detectSpeechBubblesCached(
+                    documentId = bookId,
+                    pageIndex = sourcePageIndex,
+                    bitmap = fallbackBitmap,
+                    context = context
+                )
+            } else {
+                detected
+            }
+        } finally {
+            if (ownsBitmap && !detectionBitmap.isRecycled) {
+                detectionBitmap.recycle()
+            }
+        }
+    }
+
+    LaunchedEffect(
+        isBubbleZoomModeActive,
+        isDocumentReady,
+        pdfDocument,
+        bookId,
+        currentPage,
+        totalDisplayPages,
+        virtualPages
+    ) {
+        val document = pdfDocument ?: return@LaunchedEffect
+        if (!isBubbleZoomModeActive || !isDocumentReady || totalDisplayPages <= 0) {
+            return@LaunchedEffect
+        }
+
+        for (displayPageIndex in buildSpeechBubblePrefetchOrder()) {
+            if (!isActive) break
+
+            val sourcePageIndex = when (val virtualPage = virtualPages.getOrNull(displayPageIndex)) {
+                is VirtualPage.PdfPage -> virtualPage.pdfIndex
+                null -> displayPageIndex
+                else -> continue
+            }
+
+            if (viewModel.hasCachedSpeechBubbles(bookId, sourcePageIndex)) {
+                continue
+            }
+
+            val prefetchBitmap = renderSpeechBubblePrefetchBitmap(document, sourcePageIndex) ?: continue
+            try {
+                detectSpeechBubblesForPage(
+                    sourcePageIndex = sourcePageIndex,
+                    fallbackBitmap = prefetchBitmap,
+                    allowHighQualityFallback = false
+                )
+            } finally {
+                if (!prefetchBitmap.isRecycled) {
+                    prefetchBitmap.recycle()
+                }
+            }
+
+            kotlinx.coroutines.yield()
+        }
+    }
+
+    val jumpHistory = remember { mutableStateListOf<Int>() }
+    var showJumpPill by remember { mutableStateOf(false) }
+
+    LaunchedEffect(showJumpPill, jumpHistory.size) {
+        if (showJumpPill && jumpHistory.isNotEmpty()) {
+            delay(4000)
+            showJumpPill = false
+        }
+    }
+
     LaunchedEffect(currentPage, isDocumentReady, totalPages, initialScrollDone) {
         if (isDocumentReady && totalPages > 0) {
             if (initialScrollDone) {
@@ -989,6 +1160,7 @@ fun PdfViewerScreen(
     var isLoadingDocument by remember { mutableStateOf(true) }
 
     var selectionClearTrigger by remember { mutableLongStateOf(0L) }
+    var resetZoomTrigger by remember { mutableLongStateOf(0L) }
 
     val displayPageRatios by remember(pageAspectRatios, virtualPages) {
         derivedStateOf {
@@ -1879,7 +2051,6 @@ fun PdfViewerScreen(
     val onDictionaryLookupStable = remember(executeWithOcrCheck, useOnlineDictionary, selectedDictPackage, uiState.credits, isProUser) {
         { text: String ->
             executeWithOcrCheck {
-                val isOss = BuildConfig.FLAVOR == "oss"
                 val effectiveUseOnline = !isOss && useOnlineDictionary
 
                 if (effectiveUseOnline) {
@@ -1954,6 +2125,14 @@ fun PdfViewerScreen(
         { targetPage: Int ->
             coroutineScope.launch {
                 if (targetPage in 0 until totalPages) {
+                    val current = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
+
+                    if (current != targetPage) {
+                        if (jumpHistory.size > 20) jumpHistory.removeAt(0)
+                        jumpHistory.add(current)
+                        showJumpPill = true
+                    }
+
                     if (displayMode == DisplayMode.PAGINATION) {
                         pagerState.animateScrollToPage(targetPage)
                     } else {
@@ -2700,19 +2879,8 @@ fun PdfViewerScreen(
         }
     }
 
-    LaunchedEffect(pagerState.isScrollInProgress) {
-        if (pagerState.isScrollInProgress && showBars) {
-            showBars = false
-            Timber.d("Pager scroll detected, hiding bars.")
-        }
-    }
-
     LaunchedEffect(pagerState.isScrollInProgress) {
         if (pagerState.isScrollInProgress) {
-            if (showBars) {
-                showBars = false
-                Timber.d("Pager scroll detected, hiding bars.")
-            }
             if (displayMode == DisplayMode.PAGINATION && !isAutoPagingForTts && (ttsState.isPlaying || ttsState.isLoading)) {
                 ttsController.stop()
             }
@@ -2986,6 +3154,14 @@ fun PdfViewerScreen(
     val onInternalLinkNav: (Int) -> Unit = { targetPage ->
         coroutineScope.launch {
             if (targetPage in 0 until totalPages) {
+                val current = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
+
+                if (current != targetPage) {
+                    if (jumpHistory.size > 20) jumpHistory.removeAt(0)
+                    jumpHistory.add(current)
+                    showJumpPill = true
+                }
+
                 if (displayMode == DisplayMode.PAGINATION) {
                     pagerState.animateScrollToPage(targetPage)
                 } else {
@@ -3014,16 +3190,24 @@ fun PdfViewerScreen(
 
     fun navigateToPdfSearchResult(result: SearchResult) {
         currentPdfSearchResult = result
-
         searchHighlightTarget = result
 
         coroutineScope.launch {
+            val targetPage = result.locationInSource
+            val current = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
+
+            if (current != targetPage) {
+                if (jumpHistory.size > 20) jumpHistory.removeAt(0)
+                jumpHistory.add(current)
+                showJumpPill = true
+            }
+
             if (displayMode == DisplayMode.PAGINATION) {
-                if (pagerState.currentPage != result.locationInSource) {
-                    pagerState.scrollToPage(result.locationInSource)
+                if (pagerState.currentPage != targetPage) {
+                    pagerState.scrollToPage(targetPage)
                 }
             } else {
-                verticalReaderState.scrollToPage(result.locationInSource)
+                verticalReaderState.scrollToPage(targetPage)
             }
         }
     }
@@ -3092,13 +3276,23 @@ fun PdfViewerScreen(
         drawerState = drawerState, gesturesEnabled = drawerState.isOpen, drawerContent = {
             ModalDrawerSheet(modifier = Modifier.windowInsetsPadding(WindowInsets.statusBars)) {
                 PdfNavigationDrawerContent(
+                    pdfDocument = pdfDocument,
                     flatTableOfContents = flatTableOfContents,
                     bookmarks = bookmarks,
                     userHighlights = userHighlights,
                     currentPage = currentPage,
+                    totalPages = totalDisplayPages,
                     customHighlightColors = customHighlightColors,
                     onPageSelected = { targetPage ->
                         coroutineScope.launch {
+                            val current = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
+
+                            if (current != targetPage) {
+                                if (jumpHistory.size > 20) jumpHistory.removeAt(0)
+                                jumpHistory.add(current)
+                                showJumpPill = true
+                            }
+
                             if (displayMode == DisplayMode.PAGINATION) {
                                 pagerState.scrollToPage(targetPage)
                             } else {
@@ -3203,6 +3397,44 @@ fun PdfViewerScreen(
                             val stablePdfDocument = remember(pdfDocument) { StableHolder(pdfDocument!!) }
                             when (displayMode) {
                                 DisplayMode.PAGINATION -> {
+                                    val onPaginationPreSingleTap: (Offset) -> Boolean = { tapOffset ->
+                                        val canTurnPagesByTap = tapToNavigateEnabled &&
+                                            (currentPageScale <= 1.02f || isScrollLocked)
+
+                                        if (!canTurnPagesByTap) {
+                                            false
+                                        } else {
+                                            val oneQuarterWidthPx = boxMaxWidthFloat / 4f
+                                            when {
+                                                tapOffset.x < oneQuarterWidthPx -> {
+                                                    coroutineScope.launch {
+                                                        val targetPage =
+                                                            (pagerState.currentPage - 1).coerceAtLeast(0)
+                                                        if (targetPage != pagerState.currentPage) {
+                                                            pagerState.scrollToPage(targetPage)
+                                                        }
+                                                    }
+                                                    true
+                                                }
+
+                                                tapOffset.x > (boxMaxWidthFloat - oneQuarterWidthPx) -> {
+                                                    coroutineScope.launch {
+                                                        val targetPage =
+                                                            (pagerState.currentPage + 1).coerceAtMost(
+                                                                pagerState.pageCount - 1
+                                                            )
+                                                        if (targetPage != pagerState.currentPage) {
+                                                            pagerState.scrollToPage(targetPage)
+                                                        }
+                                                    }
+                                                    true
+                                                }
+
+                                                else -> false
+                                            }
+                                        }
+                                    }
+
                                     Box(modifier = Modifier.fillMaxSize()) {
                                         HorizontalPager(
                                             state = pagerState,
@@ -3291,9 +3523,10 @@ fun PdfViewerScreen(
 
                                             @Suppress("ControlFlowWithEmptyBody") val onDrawPagination =
                                                 remember(pageIndex) {
-                                                    { point: PdfPoint ->
-                                                        if (currentSelectedTool == InkType.TEXT) {
-                                                        } else if (currentSelectedTool == InkType.ERASER) {
+                                                    { point: PdfPoint, isEraserOverride: Boolean ->
+                                                        val effectiveTool = if (isEraserOverride) InkType.ERASER else currentSelectedTool
+                                                        if (effectiveTool == InkType.TEXT) {
+                                                        } else if (effectiveTool == InkType.ERASER) {
                                                             val aspectRatio = pageAspectRatios.getOrElse(pageIndex) { 1f }
                                                             val existing = allAnnotations[pageIndex] ?: emptyList()
                                                             val toRemove = existing.filter {
@@ -3328,12 +3561,13 @@ fun PdfViewerScreen(
 
                                             @Suppress("ControlFlowWithEmptyBody") val onDrawStartPagination =
                                                 remember(pageIndex) {
-                                                    { point: PdfPoint ->
+                                                    { point: PdfPoint, isEraserOverride: Boolean ->
                                                         if (showToolSettings) {
                                                             showToolSettings = false
                                                         } else {
-                                                            if (currentSelectedTool == InkType.TEXT) {
-                                                            } else if (currentSelectedTool == InkType.ERASER) {
+                                                            val effectiveTool = if (isEraserOverride) InkType.ERASER else currentSelectedTool
+                                                            if (effectiveTool == InkType.TEXT) {
+                                                            } else if (effectiveTool == InkType.ERASER) {
                                                                 lastEraserPoint = point
                                                                 erasedAnnotationsFromStroke.clear()
                                                                 val aspectRatio = pageAspectRatios.getOrElse(pageIndex) { 1f }
@@ -3362,7 +3596,7 @@ fun PdfViewerScreen(
                                                                 drawingState.onDrawStart(
                                                                     pageIndex,
                                                                     pointWithTime,
-                                                                    currentSelectedTool,
+                                                                    effectiveTool,
                                                                     currentStrokeColorState,
                                                                     currentStrokeWidthState
                                                                 )
@@ -3403,7 +3637,8 @@ fun PdfViewerScreen(
                                                 modifier = Modifier.fillMaxSize(),
                                                 showAllTextHighlights = showAllTextHighlights,
                                                 onHighlightLoading = { /* no-op for paginated mode */ },
-                                                onSingleTap = onSingleTapStable,
+                                                onPreSingleTap = onPaginationPreSingleTap,
+                                                onSingleTap = { _ -> onSingleTapStable() },
                                                 isProUser = isProUser,
                                                 onShowDictionaryUpsellDialog = {
                                                     if (useOnlineDictionary) {
@@ -3420,6 +3655,7 @@ fun PdfViewerScreen(
                                                 onBookmarkClick = { onToggleBookmark(pageIndex) },
                                                 isZoomEnabled = true,
                                                 clearSelectionTrigger = selectionClearTrigger,
+                                                resetZoomTrigger = resetZoomTrigger,
                                                 pageAnnotations = pageAnnotationsProvider,
                                                 drawingState = drawingState,
                                                 onDrawStart = onDrawStartPagination,
@@ -3470,12 +3706,11 @@ fun PdfViewerScreen(
                                                         currentActiveOffset = newOffset
                                                     }
                                                 },
-                                                onDetectPanels = { bitmap ->
-                                                    Toast.makeText(context, "Scanning for panels...", Toast.LENGTH_SHORT).show()
-                                                    viewModel.detectComicPanels(bitmap, context)
+                                                onDetectBubbles = { sourcePageIndex, bitmap ->
+                                                    detectSpeechBubblesForPage(sourcePageIndex, bitmap)
                                                 },
-                                                onShowPanelPopup = { croppedBitmap ->
-                                                    poppedUpPanelBitmap = croppedBitmap
+                                                onShowPanelPopup = { bitmapWithRects ->
+                                                    poppedUpPanelBitmap = bitmapWithRects
                                                 },
                                                 onTwoFingerSwipe = { direction ->
                                                     coroutineScope.launch {
@@ -3647,7 +3882,15 @@ fun PdfViewerScreen(
                                                         paginationDraggingBoxId = null
                                                     }
                                                 },
-                                                onDragPageTurn = { /* Handled in onTextBoxDrag */ },
+                                                onDragPageTurn = { direction ->
+                                                    coroutineScope.launch {
+                                                        val targetPage = pagerState.currentPage + direction
+                                                        if (targetPage in 0 until totalDisplayPages) {
+                                                            pagerState.animateScrollToPage(targetPage)
+                                                        }
+                                                    }
+                                                },
+                                                isBubbleZoomModeActive = isBubbleZoomModeActive,
                                                 isVisible = isVisiblePage,
                                                 isActivePage = pagerState.currentPage == pageIndex,
                                                 isScrolling = pagerState.isScrollInProgress
@@ -3718,12 +3961,13 @@ fun PdfViewerScreen(
 
                                     @Suppress("ControlFlowWithEmptyBody") val onDrawStartStable =
                                         remember {
-                                            { pageIndex: Int, point: PdfPoint ->
+                                            { pageIndex: Int, point: PdfPoint, isEraserOverride: Boolean ->
                                                 if (showToolSettings) {
                                                     showToolSettings = false
                                                 } else {
-                                                    if (currentSelectedTool == InkType.TEXT) {
-                                                    } else if (currentSelectedTool == InkType.ERASER) {
+                                                    val effectiveTool = if (isEraserOverride) InkType.ERASER else currentSelectedTool
+                                                    if (effectiveTool == InkType.TEXT) {
+                                                    } else if (effectiveTool == InkType.ERASER) {
                                                         lastEraserPoint = point
                                                         erasedAnnotationsFromStroke.clear()
 
@@ -3753,7 +3997,7 @@ fun PdfViewerScreen(
                                                         drawingState.onDrawStart(
                                                             pageIndex,
                                                             pointWithTime,
-                                                            currentSelectedTool,
+                                                            effectiveTool,
                                                             currentStrokeColorState,
                                                             currentStrokeWidthState
                                                         )
@@ -3763,8 +4007,9 @@ fun PdfViewerScreen(
                                         }
 
                                     val onDrawStable = remember(isHighlighterSnapEnabled, isCurrentToolHighlighter, calculateSnappedPoint) {
-                                        { pageIndex: Int, point: PdfPoint ->
-                                            if (currentSelectedTool == InkType.ERASER) {
+                                        { pageIndex: Int, point: PdfPoint, isEraserOverride: Boolean ->
+                                            val effectiveTool = if (isEraserOverride) InkType.ERASER else currentSelectedTool
+                                            if (effectiveTool == InkType.ERASER) {
                                                 val aspectRatio = pageAspectRatios.getOrElse(pageIndex) { 1f }
                                                 val existing = allAnnotations[pageIndex] ?: emptyList()
                                                 val toRemove = existing.filter {
@@ -3915,6 +4160,11 @@ fun PdfViewerScreen(
                                             onZoomAndPanChanged = { newScale, newOffset ->
                                                 currentActiveScale = newScale
                                                 currentActiveOffset = newOffset
+                                            },
+                                            resetZoomTrigger = resetZoomTrigger,
+                                            isBubbleZoomModeActive = isBubbleZoomModeActive,
+                                            onDetectBubbles = { sourcePageIndex, bitmap ->
+                                                detectSpeechBubblesForPage(sourcePageIndex, bitmap)
                                             }
                                         )
                                     }
@@ -4108,7 +4358,7 @@ fun PdfViewerScreen(
                     modifier = Modifier
                         .align(Alignment.TopCenter)
                         .fillMaxWidth()
-                        .padding(top = if (showBars) verticalHeaderHeight else 0.dp)
+                        .padding(top = topOverlayInset)
                         .padding(8.dp)
                 ) {
                     Surface(
@@ -4138,6 +4388,55 @@ fun PdfViewerScreen(
                     }
                 }
 
+                AnimatedVisibility(
+                    visible = bubbleZoomDownloadProgress != null,
+                    enter = slideInVertically() + fadeIn(),
+                    exit = slideOutVertically() + fadeOut(),
+                    modifier = Modifier
+                        .align(Alignment.TopCenter)
+                        .fillMaxWidth()
+                        // shift down slightly if the OCR indicator is also showing
+                        .padding(top = topOverlayInset + if (isOcrModelDownloading) 64.dp else 0.dp)
+                        .padding(8.dp)
+                ) {
+                    Surface(
+                        color = MaterialTheme.colorScheme.tertiaryContainer,
+                        shape = RoundedCornerShape(8.dp),
+                        shadowElevation = 4.dp
+                    ) {
+                        Row(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(12.dp),
+                            verticalAlignment = Alignment.CenterVertically,
+                            horizontalArrangement = Arrangement.Center
+                        ) {
+                            val progress = bubbleZoomDownloadProgress ?: 0f
+                            if (progress > 0f) {
+                                CircularProgressIndicator(
+                                    progress = { progress },
+                                    modifier = Modifier.size(16.dp),
+                                    strokeWidth = 2.dp,
+                                    color = MaterialTheme.colorScheme.onTertiaryContainer,
+                                    trackColor = MaterialTheme.colorScheme.onTertiaryContainer.copy(alpha = 0.2f)
+                                )
+                            } else {
+                                CircularProgressIndicator(
+                                    modifier = Modifier.size(16.dp),
+                                    strokeWidth = 2.dp,
+                                    color = MaterialTheme.colorScheme.onTertiaryContainer
+                                )
+                            }
+                            Spacer(modifier = Modifier.width(12.dp))
+                            Text(
+                                text = "Downloading Bubble Zoom model... ${(progress * 100).toInt()}%",
+                                style = MaterialTheme.typography.labelLarge,
+                                color = MaterialTheme.colorScheme.onTertiaryContainer
+                            )
+                        }
+                    }
+                }
+
                 // --- Slider UI Overlay ---
                 AnimatedVisibility(
                     visible = isPageSliderVisible,
@@ -4209,6 +4508,15 @@ fun PdfViewerScreen(
                                             scrubDebounceJob.value = coroutineScope.launch {
                                                 delay(200)
                                                 if (isActive) {
+                                                    val targetPage = newValue.roundToInt()
+
+                                                    if (targetPage != sliderStartPage) {
+                                                        if (jumpHistory.lastOrNull() != sliderStartPage) {
+                                                            if (jumpHistory.size > 20) jumpHistory.removeAt(0)
+                                                            jumpHistory.add(sliderStartPage)
+                                                        }
+                                                        showJumpPill = true
+                                                    }
                                                     if (displayMode == DisplayMode.PAGINATION) {
                                                         pagerState.scrollToPage(
                                                             newValue.roundToInt()
@@ -4418,10 +4726,17 @@ fun PdfViewerScreen(
                     },
                     onShowCustomizeTools = { showCustomizeToolsSheet = true },
                     onShowOcrLanguage = {
-                        hasSelectedOcrLanguage = true
-                        showOcrLanguageDialog = true
+                        if (!isOss) {
+                            hasSelectedOcrLanguage = true
+                            showOcrLanguageDialog = true
+                        }
                     },
                     onShowVisualOptions = { showVisualOptionsSheet = true },
+                    tapToNavigateEnabled = tapToNavigateEnabled,
+                    onToggleTapToNavigate = {
+                        tapToNavigateEnabled = !tapToNavigateEnabled
+                        saveTapToNavigateSetting(context, tapToNavigateEnabled)
+                    },
                     onChangeDisplayMode = { displayMode = it },
                     onToggleKeepScreenOn = {
                         isKeepScreenOn = !isKeepScreenOn
@@ -4481,13 +4796,28 @@ fun PdfViewerScreen(
                             }
                         }
                     },
-                    onNewTabClick = { showNewTabSheet = true }
+                    onNewTabClick = { showNewTabSheet = true },
+                    onGenerateDemoAnnotations = {
+                        val page = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
+                        val demoAnnots = DemoAnnotationGenerator.generateDemoAnnotations(page)
+
+                        if (demoAnnots.isNotEmpty()) {
+                            Timber.d("Debug: Generating ${demoAnnots.size} demo annotations for page $page")
+                            val existing = allAnnotations[page] ?: emptyList()
+                            allAnnotations = allAnnotations + (page to (existing + demoAnnots))
+
+                            demoAnnots.forEach { annot ->
+                                undoStack.add(HistoryAction.Add(page, annot))
+                            }
+                            redoStack.clear()
+                        }
+                    }
                 )
 
                 ReflowProgressOverlay(
                     modifier = Modifier
                         .align(Alignment.TopCenter)
-                        .padding(top = verticalHeaderHeight)
+                        .padding(top = topOverlayInset)
                         .fillMaxWidth()
                         .padding(horizontal = 8.dp),
                     showStandardBars = showStandardBars,
@@ -4502,7 +4832,7 @@ fun PdfViewerScreen(
                     Column(
                         modifier = Modifier
                             .fillMaxSize()
-                            .padding(top = verticalHeaderHeight)
+                            .padding(top = topOverlayInset)
                             .background(MaterialTheme.colorScheme.surface)
                     ) {
                         if (isBackgroundIndexing) {
@@ -4673,6 +5003,56 @@ fun PdfViewerScreen(
                     )
                 }
 
+                val effectiveNavBarForPill = if (systemUiMode == SystemUiMode.DEFAULT || (systemUiMode == SystemUiMode.SYNC && showStandardBars)) with(density) { navBarHeight.toDp() } else 0.dp
+
+                val isBottomBarVisibleForPill = showStandardBars && !searchState.isSearchActive
+                val targetPillBottomPadding = if (isBottomBarVisibleForPill) 56.dp + 16.dp + effectiveNavBarForPill else 16.dp + effectiveNavBarForPill
+
+                val pillBottomPadding by animateDpAsState(
+                    targetValue = targetPillBottomPadding,
+                    label = "PillBottomPadding"
+                )
+
+                AnimatedVisibility(
+                    visible = showJumpPill && jumpHistory.isNotEmpty(),
+                    enter = fadeIn() + slideInVertically { it },
+                    exit = fadeOut() + slideOutVertically { it },
+                    modifier = Modifier
+                        .align(Alignment.BottomStart)
+                        .padding(bottom = pillBottomPadding)
+                        .padding(start = 16.dp)
+                ) {
+                    val lastPage = jumpHistory.lastOrNull() ?: 0
+                    Surface(
+                        shape = CircleShape,
+                        color = MaterialTheme.colorScheme.secondaryContainer,
+                        contentColor = MaterialTheme.colorScheme.onSecondaryContainer,
+                        shadowElevation = 6.dp,
+                        onClick = {
+                            val target = jumpHistory.removeLastOrNull()
+                            if (target != null) {
+                                showJumpPill = false
+                                coroutineScope.launch {
+                                    if (displayMode == DisplayMode.PAGINATION) {
+                                        pagerState.animateScrollToPage(target)
+                                    } else {
+                                        verticalReaderState.scrollToPage(target)
+                                    }
+                                }
+                            }
+                        }
+                    ) {
+                        Row(
+                            modifier = Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
+                            verticalAlignment = Alignment.CenterVertically
+                        ) {
+                            Icon(Icons.AutoMirrored.Filled.Undo, contentDescription = "Jump Back", modifier = Modifier.size(18.dp))
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text("Back to Pg ${lastPage + 1}", style = MaterialTheme.typography.labelLarge)
+                        }
+                    }
+                }
+
                 // Bottom Bar
                 PdfBottomBar(
                     modifier = Modifier.align(Alignment.BottomCenter),
@@ -4687,6 +5067,20 @@ fun PdfViewerScreen(
                     isEditMode = isEditMode,
                     isTtsSessionActive = isTtsSessionActive,
                     ttsErrorMessage = ttsState.errorMessage,
+                    jumpBackPage = jumpHistory.lastOrNull(),
+                    onJumpBack = {
+                        val target = jumpHistory.removeLastOrNull()
+                        if (target != null) {
+                            showJumpPill = false
+                            coroutineScope.launch {
+                                if (displayMode == DisplayMode.PAGINATION) {
+                                    pagerState.animateScrollToPage(target)
+                                } else {
+                                    verticalReaderState.scrollToPage(target)
+                                }
+                            }
+                        }
+                    },
                     onShowSlider = {
                         val currentPageForSlider = if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
                         sliderStartPage = currentPageForSlider
@@ -4736,6 +5130,16 @@ fun PdfViewerScreen(
                         } else {
                             startTtsWithPermissionCheck(null, null)
                         }
+                    },
+                    isBubbleZoomModeActive = isBubbleZoomModeActive,
+                    onToggleBubbleZoom = {
+                        if (isOss) {
+                            coroutineScope.launch { snackbarHostState.showSnackbar("Bubble Zoom is only available in Playstore version of Episteme") }
+                        } else if (!isBubbleZoomModeActive && !viewModel.isSpeechBubbleModelAvailable(context)) {
+                            showBubbleZoomDownloadDialog = true
+                        } else {
+                            isBubbleZoomModeActive = !isBubbleZoomModeActive
+                        }
                     }
                 )
 
@@ -5145,7 +5549,12 @@ fun PdfViewerScreen(
                     exit = fadeOut()
                 ) {
                     val percentage = (currentPageScale * 100).roundToInt()
-                    ZoomPercentageIndicator(percentage = percentage)
+                    ZoomPercentageIndicator(
+                        percentage = percentage,
+                        onResetZoomClick = {
+                            resetZoomTrigger = System.currentTimeMillis()
+                        }
+                    )
                 }
 
                 val isImeVisible = WindowInsets.ime.getBottom(LocalDensity.current) > 0
@@ -5465,7 +5874,7 @@ fun PdfViewerScreen(
                     ) {
                         Image(
                             bitmap = poppedUpPanelBitmap!!.asImageBitmap(),
-                            contentDescription = "Zoomed Panel",
+                            contentDescription = "Annotated Page",
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(16.dp)
@@ -5485,7 +5894,7 @@ fun PdfViewerScreen(
                         ) {
                             Icon(
                                 imageVector = Icons.Default.Close,
-                                contentDescription = "Close Panel",
+                                contentDescription = "Close Image",
                                 tint = Color.White
                             )
                         }
@@ -5500,6 +5909,30 @@ fun PdfViewerScreen(
                         onConfirm = { password -> documentPassword = password })
                 }
 
+                if (showBubbleZoomDownloadDialog) {
+                    AlertDialog(
+                        onDismissRequest = { showBubbleZoomDownloadDialog = false },
+                        icon = { Icon(Icons.Default.Info, contentDescription = null) },
+                        title = { Text("Download Bubble Zoom Model") },
+                        text = {
+                            Text("To use the Bubble Zoom feature, an AI model needs to be downloaded (~134 MB). Do you want to download it now?")
+                        },
+                        confirmButton = {
+                            TextButton(onClick = {
+                                showBubbleZoomDownloadDialog = false
+                                viewModel.downloadSpeechBubbleModel(context)
+                            }) {
+                                Text("Download")
+                            }
+                        },
+                        dismissButton = {
+                            TextButton(onClick = { showBubbleZoomDownloadDialog = false }) {
+                                Text(stringResource(R.string.action_cancel))
+                            }
+                        }
+                    )
+                }
+
                 if (showNewTabSheet) {
                     ModalBottomSheet(
                         onDismissRequest = { showNewTabSheet = false },
@@ -5656,7 +6089,7 @@ fun PdfViewerScreen(
                     }
                 }
 
-                if (showOcrLanguageDialog) {
+                if (showOcrLanguageDialog && !isOss) {
                     OcrLanguageSelectionDialog(
                         currentLanguage = ocrLanguage,
                         isFirstRun = !hasSelectedOcrLanguage,
@@ -6037,6 +6470,17 @@ fun PdfViewerScreen(
                         currentTtsMode = currentTtsMode,
                         isCollapsed = isTtsCollapsed,
                         onCollapseChange = { isTtsCollapsed = it },
+                        onLocateCurrentChunk = {
+                            ttsPageData?.pageIndex?.let { targetPage ->
+                                coroutineScope.launch {
+                                    if (displayMode == DisplayMode.PAGINATION) {
+                                        pagerState.scrollToPage(targetPage)
+                                    } else {
+                                        verticalReaderState.scrollToPage(targetPage)
+                                    }
+                                }
+                            }
+                        },
                         onOpenTtsSettings = { showTtsSettingsSheet = true },
                         onClose = {
                             ttsController.stop()
@@ -6165,4 +6609,4 @@ fun PdfViewerScreen(
             }
         }
     }
-}
+}

app/src/main/java/com/aryan/reader/tts/BaseTtsSynthesizer.kt

@@ -147,7 +147,35 @@ class BaseTtsSynthesizer(private val context: Context) {
         if (tts == null) return
 
         try {
-            val preferredVoiceName = loadNativeVoice(context) ?: return
+            val preferredVoiceName = loadNativeVoice(context)
+
+            if (preferredVoiceName.isNullOrBlank()) {
+                val defaultLocale = Locale.getDefault()
+                try {
+                    tts?.language = defaultLocale
+                } catch (e: Exception) {
+                    Timber.e(e, "BaseTts: Failed to restore default language")
+                }
+
+                val defaultVoice = try {
+                    tts?.defaultVoice ?: tts?.voices?.firstOrNull { voice ->
+                        voice.locale == defaultLocale && !voice.isNetworkConnectionRequired
+                    } ?: tts?.voices?.firstOrNull { voice ->
+                        voice.locale == defaultLocale
+                    }
+                } catch (e: Exception) {
+                    Timber.e(e, "BaseTts: Failed to query default voice")
+                    null
+                }
+
+                if (defaultVoice != null && tts?.voice?.name != defaultVoice.name) {
+                    Timber.d("BaseTts: Restoring system default voice to ${defaultVoice.name} (${defaultVoice.locale})")
+                    tts?.voice = defaultVoice
+                } else {
+                    Timber.d("BaseTts: Using engine default voice for locale $defaultLocale")
+                }
+                return
+            }
 
             if (tts?.voice?.name == preferredVoiceName) return
 
@@ -269,4 +297,4 @@ class BaseTtsSynthesizer(private val context: Context) {
     }
 
     private class ZombieEngineException : Exception("Engine failed to start")
-}
+}

app/src/main/java/com/aryan/reader/tts/TtsController.kt

@@ -157,6 +157,7 @@ class TtsController(context: Context) : Player.Listener {
         bookTitle: String,
         chapterTitle: String?,
         coverImageUri: String?,
+        chapterIndex: Int? = null,
         ttsMode: TtsPlaybackManager.TtsMode,
         playbackSource: String = "READER",
         authToken: String? = null
@@ -179,6 +180,7 @@ class TtsController(context: Context) : Player.Listener {
             putString(KEY_BOOK_TITLE, bookTitle)
             putString(KEY_CHAPTER_TITLE, chapterTitle)
             putString(KEY_COVER_IMAGE_URI, coverImageUri)
+            chapterIndex?.let { putInt(KEY_CHAPTER_INDEX, it) }
             putString(KEY_TTS_MODE, ttsMode.name)
             putString(KEY_PLAYBACK_SOURCE, playbackSource)
             putString(KEY_AUTH_TOKEN, authToken)
@@ -252,6 +254,8 @@ class TtsController(context: Context) : Player.Listener {
             val isLoading = customState.getBoolean("isLoading", false)
             val sessionFinished = customState.getBoolean("sessionFinished", false)
             val playbackSource = customState.getString("playbackSource")
+            val serviceBookTitle = customState.getString("bookTitle")
+            val serviceChapterIndex = customState.getInt("chapterIndex", -1).takeIf { it >= 0 }
 
             val mediaItemExtras = currentMediaItem?.mediaMetadata?.extras
             val sourceCfi = mediaItemExtras?.getString("sourceCfi")
@@ -270,6 +274,16 @@ class TtsController(context: Context) : Player.Listener {
                     if (isLoading) currentState.currentText else null
                 },
                 errorMessage = customState.getString("errorMessage"),
+                bookTitle = if (isPlaybackActive) {
+                    currentMediaItem?.mediaMetadata?.artist?.toString() ?: serviceBookTitle
+                } else {
+                    if (isLoading) currentState.bookTitle else serviceBookTitle
+                },
+                chapterIndex = if (isPlaybackActive || isLoading) {
+                    serviceChapterIndex ?: currentState.chapterIndex
+                } else {
+                    serviceChapterIndex
+                },
                 speakerId = serviceSpeaker,
                 sourceCfi = if (isPlaybackActive) {
                     sourceCfi
@@ -338,4 +352,4 @@ fun rememberTtsController(): TtsController {
     }
 
     return controller
-}
+}

app/src/main/java/com/aryan/reader/tts/TtsPlaybackManager.kt

@@ -70,6 +70,7 @@ const val KEY_WORD_TIMESTAMPS = "KEY_WORD_TIMESTAMPS"
 const val KEY_WORD_OFFSETS = "KEY_WORD_OFFSETS"
 const val KEY_PLAYBACK_SOURCE = "KEY_PLAYBACK_SOURCE"
 const val KEY_AUTH_TOKEN = "KEY_AUTH_TOKEN"
+const val KEY_CHAPTER_INDEX = "KEY_CHAPTER_INDEX"
 
 private const val PREFETCH_LOOKAHEAD = 3
 
@@ -100,6 +101,8 @@ class TtsPlaybackManager(
         val isLoading: Boolean = false,
         val currentText: String? = null,
         val errorMessage: String? = null,
+        val bookTitle: String? = null,
+        val chapterIndex: Int? = null,
         val speakerId: String = DEFAULT_SPEAKER_ID,
         val sourceCfi: String? = null,
         val startOffsetInSource: Int = -1,
@@ -189,6 +192,7 @@ class TtsPlaybackManager(
                 val bookTitle = args.getString(KEY_BOOK_TITLE)
                 val chapterTitle = args.getString(KEY_CHAPTER_TITLE)
                 val coverImageUri = args.getString(KEY_COVER_IMAGE_URI)
+                val chapterIndex = args.getInt(KEY_CHAPTER_INDEX, -1).takeIf { it >= 0 }
                 val ttsModeName = args.getString(KEY_TTS_MODE, TtsMode.CLOUD.name)
                 val playbackSource = args.getString(KEY_PLAYBACK_SOURCE)
                 val ttsMode = try { TtsMode.valueOf(ttsModeName ?: TtsMode.CLOUD.name) } catch (_: Exception) { TtsMode.CLOUD }
@@ -204,7 +208,7 @@ class TtsPlaybackManager(
 
                 val authToken = args.getString(KEY_AUTH_TOKEN)
                 Timber.tag("TTS_CLOUD_DIAG").d("TtsPlaybackManager received START. Token present: ${!authToken.isNullOrBlank()}")
-                handleStartTts(richChunks, speakerId, bookTitle, chapterTitle, coverImageUri, ttsMode, playbackSource, args)
+                handleStartTts(richChunks, speakerId, bookTitle, chapterTitle, coverImageUri, chapterIndex, ttsMode, playbackSource, args)
             }
             STOP_TTS_COMMAND -> {
                 Timber.d("Received STOP command.")
@@ -337,6 +341,7 @@ class TtsPlaybackManager(
         bookTitle: String?,
         chapterTitle: String?,
         coverImageUri: String?,
+        chapterIndex: Int?,
         ttsMode: TtsMode,
         playbackSource: String?,
         args: Bundle // Added this parameter
@@ -375,6 +380,8 @@ class TtsPlaybackManager(
 
         _ttsState.value = TtsState(
             isLoading = true,
+            bookTitle = bookTitle,
+            chapterIndex = chapterIndex,
             speakerId = speakerId,
             playbackSource = playbackSource,
             ttsMode = ttsMode.name
@@ -857,6 +864,8 @@ class TtsPlaybackManager(
         val bundle = Bundle().apply {
             putBoolean("isLoading", state.isLoading)
             putString("errorMessage", state.errorMessage)
+            putString("bookTitle", state.bookTitle)
+            putInt("chapterIndex", state.chapterIndex ?: -1)
             putString("speakerId", state.speakerId)
             putBoolean("sessionEndedByStop", state.sessionEndedByStop)
             putString("currentWordSourceCfi", state.currentWordSourceCfi)
@@ -897,4 +906,4 @@ class TtsPlaybackManager(
         }
         Timber.tag("TTS_CLOUD_DIAG").d("ExoPlayer playback state changed: $stateName")
     }
-}
+}

app/src/main/res/drawable-nodpi/comic_bubble.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M440,157L357,240L240,240L240,357L157,440L240,523L240,640L357,640L440,723L540,623L708,708L622,541L723,440L640,357L640,240L523,240L440,157ZM440,44L556,160L720,160L720,324L836,440L720,556L835,782Q842,795 839,807.5Q836,820 828,828Q820,836 807.5,839Q795,842 782,835L556,720L440,836L324,720L160,720L160,556L44,440L160,324L160,160L324,160L440,44ZM440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440L440,440Z"/>
+</vector>

app/src/main/res/drawable-nodpi/pin_drop.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M480,659Q579,579 629.5,505Q680,431 680,366Q680,276 624,218Q568,160 480,160Q392,160 336,218Q280,276 280,366Q280,431 330.5,505Q381,579 480,659ZM480,760Q339,656 269.5,558Q200,460 200,366Q200,241 278,160.5Q356,80 480,80Q604,80 682,160.5Q760,241 760,366Q760,460 690.5,558Q621,656 480,760ZM480,440Q513,440 536.5,416.5Q560,393 560,360Q560,327 536.5,303.5Q513,280 480,280Q447,280 423.5,303.5Q400,327 400,360Q400,393 423.5,416.5Q447,440 480,440ZM200,880L200,800L760,800L760,880L200,880ZM480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Q480,360 480,360Z"/>
+</vector>

app/src/main/res/drawable-nodpi/tag.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M240,800L280,640L120,640L140,560L300,560L340,400L180,400L200,320L360,320L400,160L480,160L440,320L600,320L640,160L720,160L680,320L840,320L820,400L660,400L620,560L780,560L760,640L600,640L560,800L480,800L520,640L360,640L320,800L240,800ZM380,560L540,560L580,400L420,400L380,560Z"/>
+</vector>

app/src/main/res/drawable-nodpi/zoom_out.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M120,840L120,600L200,600L200,704L324,580L380,636L256,760L360,760L360,840L120,840ZM600,840L600,760L704,760L580,636L636,580L760,704L760,600L840,600L840,840L600,840ZM324,380L200,256L200,360L120,360L120,120L360,120L360,200L256,200L380,324L324,380ZM636,380L580,324L704,200L600,200L600,120L840,120L840,360L760,360L760,256L636,380Z"/>
+</vector>

app/src/main/res/values/font_certs.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <array name="com_google_android_gms_fonts_certs">
+        <item>@array/com_google_android_gms_fonts_certs_dev</item>
+        <item>@array/com_google_android_gms_fonts_certs_prod</item>
+    </array>
+    <string-array name="com_google_android_gms_fonts_certs_dev">
+        <item>
+            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</item>
+    </string-array>
+    <string-array name="com_google_android_gms_fonts_certs_prod">
+        <item>
+            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</item>
+    </string-array>
+</resources>

app/src/main/res/values/strings.xml

@@ -850,6 +850,9 @@
     <string name="label_font_size">Font Size</string>
     <string name="label_line_height">Line Height</string>
     <string name="label_paragraph_gap">Paragraph Gap</string>
+    <string name="label_image_size">Image Size</string>
+    <string name="label_horizontal_margin">Horizontal Margin</string>
+    <string name="label_none">None</string>
     <!-- Short label for the "Original" font option in the reader settings. "Orig" is an abbreviation. -->
     <string name="label_original">Orig</string>
     <!-- Typographic sample label shown in the font size picker — "Aa" represents text size visually. Do not translate. -->

app/src/oss/java/com/aryan/reader/ml/SpeechBubbleDetector.kt

@@ -0,0 +1,20 @@
+package com.aryan.reader.ml
+
+import android.graphics.Bitmap
+import timber.log.Timber
+import java.io.File
+
+class SpeechBubbleDetector(modelFile: File) : ISpeechBubbleDetector {
+
+    init {
+        Timber.i("OSS flavor: SpeechBubbleDetector stub initialized. ONNX features are disabled.")
+    }
+
+    override fun detectBubbles(bitmap: Bitmap, confidenceThreshold: Float): List<SpeechBubble> {
+        return emptyList()
+    }
+
+    override fun close() {
+        // No-op
+    }
+}

app/src/pro/java/com/aryan/reader/ml/SpeechBubbleDetector.kt

@@ -0,0 +1,259 @@
+package com.aryan.reader.ml
+
+import ai.onnxruntime.OnnxTensor
+import ai.onnxruntime.OrtEnvironment
+import ai.onnxruntime.OrtSession
+import android.graphics.Bitmap
+import android.graphics.Color
+import android.graphics.RectF
+import androidx.core.graphics.scale
+import timber.log.Timber
+import java.io.File
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.util.Collections
+import kotlin.math.min
+
+class SpeechBubbleDetector(modelFile: File) : ISpeechBubbleDetector {
+    private var env: OrtEnvironment? = null
+    private var session: OrtSession? = null
+    private val inputSize = 504
+
+    private val byteBuffer = ByteBuffer.allocateDirect(3 * inputSize * inputSize * 4).order(
+        ByteOrder.nativeOrder())
+    private val floatBuffer = byteBuffer.asFloatBuffer()
+    private val pixels = IntArray(inputSize * inputSize)
+
+    init {
+        try {
+            env = OrtEnvironment.getEnvironment()
+            val options = OrtSession.SessionOptions().apply {
+                // Dynamically use available cores (cap at 4 to prevent thermal throttling)
+                val threadCount = Runtime.getRuntime().availableProcessors().coerceAtMost(4)
+                setIntraOpNumThreads(threadCount)
+                setOptimizationLevel(OrtSession.SessionOptions.OptLevel.ALL_OPT)
+
+                // 1. Thread spinning keeps CPU threads active between operations (reduces latency)
+                try {
+                    addConfigEntry("session.intra_op.allow_spinning", "1")
+                } catch (_: Throwable) {
+                    Timber.w("Could not set intra_op.allow_spinning config")
+                }
+
+                // 2. Enable XNNPACK (Highly optimized ARM CPU execution provider)
+                try {
+                    // Safest cross-version way to request XNNPACK in Android ORT
+                    addConfigEntry("session.disable_cpu_ep_fallback", "0")
+                    addConfigEntry("optimization.enable_xnnpack", "1")
+                    Timber.i("ONNX XNNPACK requested via config entry for optimized CPU inference.")
+                } catch (t: Throwable) {
+                    Timber.w(t, "Could not set XNNPACK config entries")
+                }
+            }
+            session = env?.createSession(modelFile.absolutePath, options)
+        } catch (t: Throwable) {
+            Timber.e(t, "Fatal error initializing ONNX model")
+        }
+    }
+
+    // 3. Synchronized to safely share pre-allocated buffers across calls
+    @Synchronized
+    override fun detectBubbles(bitmap: Bitmap, confidenceThreshold: Float): List<SpeechBubble> {
+        Timber.tag("BubbleZoom").d("Detector: detectBubbles started. Bitmap: ${bitmap.width}x${bitmap.height}, threshold: $confidenceThreshold")
+        val currentEnv = env ?: run {
+            Timber.tag("BubbleZoom").w("Detector: OrtEnvironment is null")
+            return emptyList()
+        }
+        val currentSession = session ?: run {
+            Timber.tag("BubbleZoom").w("Detector: OrtSession is null")
+            return emptyList()
+        }
+
+        try {
+            // 4. Skip unnecessary scaling if already 504x504
+            val resized = if (bitmap.width == inputSize && bitmap.height == inputSize) {
+                bitmap
+            } else {
+                bitmap.scale(inputSize, inputSize, false)
+            }
+
+            floatBuffer.clear() // Reset buffer positions for reuse
+            resized.getPixels(pixels, 0, inputSize, 0, 0, inputSize, inputSize)
+
+            val imageArea = inputSize * inputSize
+            for (i in 0 until imageArea) {
+                val pixel = pixels[i]
+                val r = ((pixel shr 16) and 0xFF) / 255.0f
+                val g = ((pixel shr 8) and 0xFF) / 255.0f
+                val b = (pixel and 0xFF) / 255.0f
+
+                floatBuffer.put(i, r)
+                floatBuffer.put(i + imageArea, g)
+                floatBuffer.put(i + 2 * imageArea, b)
+            }
+            floatBuffer.rewind() // Ready for tensor creation
+
+            val inputTensor = OnnxTensor.createTensor(currentEnv, floatBuffer, longArrayOf(1, 3, inputSize.toLong(), inputSize.toLong()))
+            val inputName = currentSession.inputNames.iterator().next()
+
+            Timber.tag("BubbleZoom").d("Detector: Running ONNX inference...")
+            val results = currentSession.run(Collections.singletonMap(inputName, inputTensor))
+            Timber.tag("BubbleZoom").d("Detector: ONNX inference finished.")
+
+            val parsedResults = mutableListOf<SpeechBubble>()
+
+            var detsOutput: FloatArray? = null
+            var labelsOutput: FloatArray? = null
+            var masksOutput: FloatArray? = null
+
+            var numBoxes = 0
+            var numClasses = 0
+            var maskH = 0
+            var maskW = 0
+
+            Timber.tag("ONNX_SEG").d("--- ONNX OUTPUT TENSORS ---")
+            results.forEach { entry ->
+                val value = entry.value as OnnxTensor
+                val shape = value.info.shape
+                Timber.tag("ONNX_SEG").d("Name: ${entry.key}, Shape: ${shape.contentToString()}")
+
+                if (entry.key.contains("dets") || entry.key.contains("boxes") || (shape.size == 3 && shape[2] == 4L)) {
+                    numBoxes = shape[1].toInt()
+                    val flatOutput = FloatArray(shape.reduce { acc, l -> acc * l }.toInt())
+                    value.floatBuffer.get(flatOutput)
+                    detsOutput = flatOutput
+                } else if (entry.key.contains("labels") || entry.key.contains("scores") || (shape.size == 3 && shape[2] != 4L && shape[1] == numBoxes.toLong())) {
+                    numClasses = shape[2].toInt()
+                    val flatOutput = FloatArray(shape.reduce { acc, l -> acc * l }.toInt())
+                    value.floatBuffer.get(flatOutput)
+                    labelsOutput = flatOutput
+                } else if (entry.key.contains("masks") || shape.size == 4) {
+                    maskH = shape[2].toInt()
+                    maskW = shape[3].toInt()
+                    val flatOutput = FloatArray(shape.reduce { acc, l -> acc * l }.toInt())
+                    value.floatBuffer.get(flatOutput)
+                    masksOutput = flatOutput
+                }
+            }
+
+            Timber.tag("BubbleZoom").d("Detector: Outputs mapped. Boxes: $numBoxes, Classes: $numClasses, Masks: ${maskW}x${maskH}")
+
+            if (detsOutput != null && labelsOutput != null) {
+                var maxCoord = 0f
+                for (i in 0 until min(100, detsOutput.size)) {
+                    if (detsOutput[i] > maxCoord) maxCoord = detsOutput[i]
+                }
+                val isNormalized = maxCoord <= 1.5f
+                val scaleX = if (isNormalized) bitmap.width.toFloat() else bitmap.width.toFloat() / inputSize
+                val scaleY = if (isNormalized) bitmap.height.toFloat() else bitmap.height.toFloat() / inputSize
+
+                for (i in 0 until numBoxes) {
+                    var maxConf = 0f
+                    for (c in 0 until numClasses) {
+                        val conf = labelsOutput[i * numClasses + c]
+                        if (conf > maxConf) maxConf = conf
+                    }
+
+                    if (maxConf > confidenceThreshold) {
+                        val val0 = detsOutput[i * 4 + 0]
+                        val val1 = detsOutput[i * 4 + 1]
+                        val val2 = detsOutput[i * 4 + 2]
+                        val val3 = detsOutput[i * 4 + 3]
+
+                        val w = val2 * 1.08f
+                        val h = val3 * 1.08f
+
+                        val rawLeft = val0 - w / 2
+                        val rawTop = val1 - h / 2
+                        val rawRight = val0 + w / 2
+                        val rawBottom = val1 + h / 2
+
+                        val left = rawLeft * scaleX
+                        val top = rawTop * scaleY
+                        val right = rawRight * scaleX
+                        val bottom = rawBottom * scaleY
+
+                        var maskBitmap: Bitmap? = null
+                        if (masksOutput != null && maskH > 0 && maskW > 0) {
+                            try {
+                                val maskScaleX = if (isNormalized) maskW.toFloat() else maskW.toFloat() / inputSize
+                                val maskScaleY = if (isNormalized) maskH.toFloat() else maskH.toFloat() / inputSize
+
+                                val mLeft = (rawLeft * maskScaleX).toInt().coerceIn(0, maskW - 1)
+                                val mTop = (rawTop * maskScaleY).toInt().coerceIn(0, maskH - 1)
+                                val mRight = (rawRight * maskScaleX).toInt().coerceIn(0, maskW - 1)
+                                val mBottom = (rawBottom * maskScaleY).toInt().coerceIn(0, maskH - 1)
+
+                                val cropW = mRight - mLeft
+                                val cropH = mBottom - mTop
+
+                                if (cropW > 0 && cropH > 0) {
+                                    val maskBmp = Bitmap.createBitmap(cropW, cropH, Bitmap.Config.ALPHA_8)
+                                    val maskPixels = IntArray(cropW * cropH)
+                                    val offset = i * maskW * maskH
+
+                                    // Dilate radius: expands the mask slightly to include outline
+                                    val dilationRadius = 1
+
+                                    for (y in 0 until cropH) {
+                                        for (x in 0 until cropW) {
+                                            val maskX = mLeft + x
+                                            val maskY = mTop + y
+
+                                            var isWhite = false
+
+                                            // Morphological Dilation: Check neighbors to expand & smooth the mask
+                                            for (dy in -dilationRadius..dilationRadius) {
+                                                for (dx in -dilationRadius..dilationRadius) {
+                                                    val nx = (maskX + dx).coerceIn(0, maskW - 1)
+                                                    val ny = (maskY + dy).coerceIn(0, maskH - 1)
+                                                    val p = ny * maskW + nx
+                                                    // > -0.5f captures slightly softer edge bounds
+                                                    if (offset + p < masksOutput.size && masksOutput[offset + p] > -0.5f) {
+                                                        isWhite = true
+                                                        break
+                                                    }
+                                                }
+                                                if (isWhite) break
+                                            }
+
+                                            maskPixels[y * cropW + x] = if (isWhite) Color.WHITE else Color.TRANSPARENT
+                                        }
+                                    }
+                                    maskBmp.setPixels(maskPixels, 0, cropW, 0, 0, cropW, cropH)
+                                    maskBitmap = maskBmp
+                                }
+                            } catch (e: Exception) {
+                                Timber.tag("ONNX_SEG").e(e, "Failed to parse mask for bubble $i")
+                            }
+                        }
+
+                        // Prevent adding invalid boxes
+                        if (right > left && bottom > top) {
+                            parsedResults.add(SpeechBubble(RectF(left, top, right, bottom), maskBitmap))
+                        }
+                    }
+                }
+            }
+
+            Timber.tag("BubbleZoom").d("Detector: Parsed ${parsedResults.size} valid bubbles above threshold.")
+
+            inputTensor.close()
+            results.close()
+            if (resized != bitmap) resized.recycle()
+
+            return parsedResults
+
+        } catch (t: Throwable) {
+            Timber.tag("BubbleZoom").e(t, "Detector: ONNX Inference failed completely")
+        }
+        return emptyList()
+    }
+
+    override fun close() {
+        session?.close()
+        session = null
+        env?.close()
+        env = null
+    }
+}

app/src/test/java/com/aryan/reader/MainViewModelTest.kt

@@ -0,0 +1,169 @@
+package com.aryan.reader
+
+import android.app.Application
+import android.content.SharedPreferences
+import android.content.res.Resources
+import android.util.Log
+import androidx.work.WorkManager
+import com.aryan.reader.data.*
+import com.tom_roush.pdfbox.android.PDFBoxResourceLoader
+import io.mockk.*
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.*
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainViewModelTest {
+
+    private val testDispatcher = StandardTestDispatcher()
+
+    private lateinit var viewModel: MainViewModel
+    private lateinit var mockApplication: Application
+    private lateinit var mockPrefs: SharedPreferences
+    private lateinit var mockEditor: SharedPreferences.Editor
+
+    private val billingStateFlow = MutableStateFlow(ProUpgradeState())
+    private val customFontsFlow = MutableStateFlow<List<CustomFontEntity>>(emptyList())
+
+    @Before
+    fun setup() {
+        mockkStatic(Log::class)
+        every { Log.isLoggable(any(), any()) } returns false
+        every { Log.d(any(), any()) } returns 0
+        every { Log.i(any(), any()) } returns 0
+        every { Log.e(any(), any(), any()) } returns 0
+        every { Log.w(any(), any<String>()) } returns 0
+
+        Dispatchers.setMain(testDispatcher)
+
+        mockApplication = mockk()
+        mockPrefs = mockk(relaxed = true)
+        mockEditor = mockk(relaxed = true)
+        val mockResources = mockk<Resources>(relaxed = true)
+
+        every { mockApplication.applicationContext } returns mockApplication
+        every { mockApplication.getSharedPreferences(any(), any()) } returns mockPrefs
+        every { mockApplication.resources } returns mockResources
+        every { mockPrefs.edit() } returns mockEditor
+
+        every { mockPrefs.getString(any(), any()) } answers { secondArg() as String? }
+        every { mockPrefs.getBoolean(any(), any()) } answers { secondArg() as Boolean }
+        every { mockPrefs.getInt(any(), any()) } answers { secondArg() as Int }
+        every { mockPrefs.getFloat(any(), any()) } answers { secondArg() as Float }
+
+        mockkStatic(AppDatabase::class)
+        val mockDb = mockk<AppDatabase>(relaxed = true)
+        every { AppDatabase.getDatabase(any()) } returns mockDb
+
+        mockkStatic(WorkManager::class)
+        every { WorkManager.getInstance(any()) } returns mockk(relaxed = true)
+        mockkStatic(PDFBoxResourceLoader::class)
+        every { PDFBoxResourceLoader.init(any()) } just Runs
+
+        mockkConstructor(AuthRepository::class)
+        mockkConstructor(RecentFilesRepository::class)
+        mockkConstructor(BillingClientWrapper::class)
+        mockkConstructor(RemoteConfigRepository::class)
+        mockkConstructor(FirestoreRepository::class)
+        mockkConstructor(FeedbackRepository::class)
+        mockkConstructor(FontsRepository::class)
+
+        every { anyConstructed<BillingClientWrapper>().proUpgradeState } returns billingStateFlow
+        every { anyConstructed<AuthRepository>().getSignedInUser() } returns null
+        every { anyConstructed<AuthRepository>().observeAuthState() } returns flowOf(null)
+        every { anyConstructed<RecentFilesRepository>().getRecentFilesFlow() } returns flowOf(emptyList())
+        every { anyConstructed<RecentFilesRepository>().activeShelvesFlow } returns flowOf(emptyList())
+        every { anyConstructed<RecentFilesRepository>().shelfCrossRefsFlow } returns flowOf(emptyList())
+        every { anyConstructed<RecentFilesRepository>().tagsFlow } returns flowOf(emptyList())
+        every { anyConstructed<RecentFilesRepository>().tagCrossRefsFlow } returns flowOf(emptyList())
+
+        coEvery { anyConstructed<RecentFilesRepository>().migrateLegacyShelvesToRoom() } just Runs
+        coEvery { anyConstructed<RecentFilesRepository>().seedTagsIfEmpty(any()) } just Runs
+
+        every { anyConstructed<FontsRepository>().getAllFonts() } returns customFontsFlow
+
+        viewModel = MainViewModel(mockApplication)
+    }
+
+    @After
+    fun tearDown() {
+        Dispatchers.resetMain()
+        unmockkAll()
+    }
+
+    @Test
+    fun `search query updates uiState when search is active`() = runTest {
+        backgroundScope.launch(UnconfinedTestDispatcher(testScheduler)) {
+            viewModel.uiState.collect {}
+        }
+
+        viewModel.setSearchActive(true)
+        viewModel.onSearchQueryChange("Moby Dick")
+
+        assertEquals("Moby Dick", viewModel.uiState.value.searchQuery)
+        assertTrue(viewModel.uiState.value.isSearchActive)
+    }
+
+    @Test
+    fun `setSearchActive false clears the search query`() = runTest {
+        backgroundScope.launch(UnconfinedTestDispatcher(testScheduler)) {
+            viewModel.uiState.collect {}
+        }
+
+        viewModel.setSearchActive(true)
+        viewModel.onSearchQueryChange("Android")
+        viewModel.setSearchActive(false)
+
+        assertEquals("", viewModel.uiState.value.searchQuery)
+        assertFalse(viewModel.uiState.value.isSearchActive)
+    }
+
+    @Test
+    fun `switching theme updates internal state and preferences`() = runTest {
+        backgroundScope.launch(UnconfinedTestDispatcher(testScheduler)) {
+            viewModel.uiState.collect {}
+        }
+
+        viewModel.setAppThemeMode(AppThemeMode.DARK)
+
+        assertEquals(AppThemeMode.DARK, viewModel.uiState.value.appThemeMode)
+        verify { mockEditor.putString("app_theme_mode", AppThemeMode.DARK.name) }
+    }
+
+    @Test
+    fun `setTabsEnabled persists to shared preferences`() = runTest {
+        backgroundScope.launch(UnconfinedTestDispatcher(testScheduler)) {
+            viewModel.uiState.collect {}
+        }
+
+        viewModel.setTabsEnabled(true)
+
+        assertTrue(viewModel.uiState.value.isTabsEnabled)
+        verify { mockEditor.putBoolean("tabs_enabled", true) }
+    }
+
+    @Test
+    fun `banner message logic works correctly`() = runTest {
+        backgroundScope.launch(UnconfinedTestDispatcher(testScheduler)) {
+            viewModel.uiState.collect {}
+        }
+
+        viewModel.showBanner("Test Message", isError = true)
+
+        val currentBanner = viewModel.uiState.value.bannerMessage
+        assertEquals("Test Message", currentBanner?.message)
+        assertTrue(currentBanner?.isError == true)
+
+        viewModel.bannerMessageShown()
+        assertEquals(null, viewModel.uiState.value.bannerMessage)
+    }
+}