diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 48ee2fe..aa48d29 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -40,6 +40,7 @@ android {
             }
         }
         buildConfigField("boolean", "IS_PRO", "false")
+        buildConfigField("boolean", "IS_OFFLINE", "false")
     }
 
     flavorDimensions += "version"
@@ -91,6 +92,12 @@ android {
                 "proguard-rules.pro"
             )
         }
+
+        create("releaseOffline") {
+            initWith(getByName("release"))
+            matchingFallbacks += listOf("release")
+            buildConfigField("boolean", "IS_OFFLINE", "true")
+        }
     }
 
     applicationVariants.all {
diff --git a/app/src/main/java/com/aryan/reader/Common.kt b/app/src/main/java/com/aryan/reader/Common.kt
index 9206e28..1252597 100644
--- a/app/src/main/java/com/aryan/reader/Common.kt
+++ b/app/src/main/java/com/aryan/reader/Common.kt
@@ -390,7 +390,7 @@ fun SearchTopBar(
             ) {
                 Icon(
                     imageVector = Icons.AutoMirrored.Filled.ArrowBack,
-                    contentDescription = stringResource(R.string.content_desc_close_search)
+                    contentDescription = stringResource(R.string.tooltip_close_search)
                 )
             }
 
@@ -426,7 +426,7 @@ fun SearchTopBar(
                 ) {
                     Icon(
                         Icons.Default.Close,
-                        contentDescription = stringResource(R.string.content_desc_clear_search)
+                        contentDescription = stringResource(R.string.tooltip_clear_search)
                     )
                 }
             }
@@ -448,8 +448,8 @@ fun SearchTopBar(
                 Icon(
                     imageVector = if (searchState.showSearchResultsPanel) Icons.Default.ArrowDropUp else Icons.Default.ArrowDropDown,
                     contentDescription = stringResource(
-                        if (searchState.showSearchResultsPanel) R.string.content_desc_hide_results
-                        else R.string.content_desc_show_results
+                        if (searchState.showSearchResultsPanel) R.string.tooltip_hide_results
+                        else R.string.tooltip_show_results
                     )
                 )
             }
@@ -478,7 +478,7 @@ fun SearchNavigationControls(
                 onClick = { onNavigate(searchState.currentSearchResultIndex - 1) },
                 enabled = searchState.currentSearchResultIndex > 0
             ) {
-                Icon(Icons.Default.ArrowDropUp, contentDescription = stringResource(R.string.content_desc_prev_result))
+                Icon(Icons.Default.ArrowDropUp, contentDescription = stringResource(R.string.tooltip_prev_result))
             }
 
             Text(
@@ -493,7 +493,7 @@ fun SearchNavigationControls(
                 onClick = { onNavigate(searchState.currentSearchResultIndex + 1) },
                 enabled = searchState.currentSearchResultIndex < searchState.searchResultsCount - 1
             ) {
-                Icon(Icons.Default.ArrowDropDown, contentDescription = stringResource(R.string.content_desc_next_result))
+                Icon(Icons.Default.ArrowDropDown, contentDescription = stringResource(R.string.tooltip_next_result))
             }
         }
     }
diff --git a/app/src/main/java/com/aryan/reader/LibraryScreen.kt b/app/src/main/java/com/aryan/reader/LibraryScreen.kt
index eeff620..0171375 100644
--- a/app/src/main/java/com/aryan/reader/LibraryScreen.kt
+++ b/app/src/main/java/com/aryan/reader/LibraryScreen.kt
@@ -18,6 +18,8 @@
  * mail: epistemereader@gmail.com
  */
 // LibraryScreen.kt
+@file:Suppress("KotlinConstantConditions")
+
 package com.aryan.reader
 
 import android.net.Uri
@@ -158,9 +160,19 @@ fun LibraryScreen(
     val sortOrder = uiState.sortOrder
     val shelves = uiState.shelves
     val rawLibraryFiles = uiState.rawLibraryFiles
+    val tabTitles = remember {
+        buildList {
+            add(context.getString(R.string.tab_all_books))
+            add(context.getString(R.string.tab_shelves))
+            add(context.getString(R.string.tab_folders))
+            if (!BuildConfig.IS_OFFLINE) {
+                add(context.getString(R.string.tab_catalogs))
+            }
+        }
+    }
     val pagerState = rememberPagerState(
         initialPage = uiState.libraryScreenStartPage,
-        pageCount = { 4 }
+        pageCount = { tabTitles.size }
     )
 
     val containsFolderItems = remember(selectedItems) {
@@ -254,6 +266,7 @@ fun LibraryScreen(
 
     Box(modifier = Modifier.fillMaxSize()) {
         LibraryScreenContent(
+            tabTitles = tabTitles,
             recentFiles = uiState.allRecentFiles,
             rawLibraryFiles = rawLibraryFiles,
             shelves = shelves,
@@ -494,6 +507,7 @@ fun ShelfScreen(
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
 fun LibraryScreenContent(
+    tabTitles: List<String>,
     recentFiles: List<RecentFileItem>,
     rawLibraryFiles: List<RecentFileItem>,
     shelves: List<Shelf>,
@@ -543,12 +557,6 @@ fun LibraryScreenContent(
     val isBookContextualModeActive = selectedItems.isNotEmpty()
     val isShelfContextualModeActive = selectedShelves.isNotEmpty()
     var showSortMenu by remember { mutableStateOf(false) }
-    val tabTitles = listOf(
-        stringResource(R.string.tab_all_books),
-        stringResource(R.string.tab_shelves),
-        stringResource(R.string.tab_folders),
-        stringResource(R.string.tab_catalogs)
-    )
     val searchFocusRequester = remember { FocusRequester() }
 
     var textFieldValue by remember(isSearchActive) {
@@ -811,13 +819,15 @@ fun LibraryScreenContent(
                     )
                 }
                 3 -> {
-                    OpdsTab(
-                        localLibraryFiles = rawLibraryFiles,
-                        onBookDownloaded = onOpdsBookDownloaded,
-                        onReadBook = onItemClick,
-                        onStreamBook = onStreamOpdsBook,
-                        onDeleteCatalogStreams = onDeleteCatalogStreams
-                    )
+                    if (!BuildConfig.IS_OFFLINE) {
+                        OpdsTab(
+                            localLibraryFiles = rawLibraryFiles,
+                            onBookDownloaded = onOpdsBookDownloaded,
+                            onReadBook = onItemClick,
+                            onStreamBook = onStreamOpdsBook,
+                            onDeleteCatalogStreams = onDeleteCatalogStreams
+                        )
+                    }
                 }
             }
         }
diff --git a/app/src/main/java/com/aryan/reader/SharedComposables.kt b/app/src/main/java/com/aryan/reader/SharedComposables.kt
index 83f236b..15279a0 100644
--- a/app/src/main/java/com/aryan/reader/SharedComposables.kt
+++ b/app/src/main/java/com/aryan/reader/SharedComposables.kt
@@ -664,7 +664,7 @@ fun AboutDialog(onDismiss: () -> Unit) {
                                 tint = MaterialTheme.colorScheme.primary
                             )
                         },
-                        text = stringResource(R.string.about_privacy),
+                        text = stringResource(R.string.legal_privacy_policy),
                         subtitle = stringResource(R.string.about_privacy_desc),
                         onClick = { uriHandler.openUri(PRIVACY_POLICY_URL) }
                     )
@@ -680,7 +680,7 @@ fun AboutDialog(onDismiss: () -> Unit) {
                                 tint = MaterialTheme.colorScheme.primary
                             )
                         },
-                        text = stringResource(R.string.about_terms),
+                        text = stringResource(R.string.legal_terms_of_service),
                         subtitle = stringResource(R.string.about_terms_desc),
                         onClick = { uriHandler.openUri(TERMS_URL) }
                     )
diff --git a/app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt b/app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt
index 23ae79b..10a582f 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt
@@ -72,6 +72,7 @@ import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.IntRect
 import androidx.compose.ui.unit.IntSize
@@ -81,6 +82,7 @@ import androidx.compose.ui.viewinterop.AndroidView
 import androidx.compose.ui.window.Popup
 import androidx.compose.ui.window.PopupPositionProvider
 import androidx.core.net.toUri
+import com.aryan.reader.R
 import com.aryan.reader.ReaderTexture
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
@@ -415,8 +417,8 @@ fun ChapterWebView(
         val urlToShow = showExternalLinkDialog!!
         AlertDialog(
             onDismissRequest = { showExternalLinkDialog = null },
-            title = { Text("External Link") },
-            text = { Text("You clicked on an external link:\n\n$urlToShow\n\nWhat would you like to do?") },
+            title = { Text(stringResource(R.string.dialog_external_link_title)) },
+            text = { Text(stringResource(R.string.dialog_external_link_desc, urlToShow)) },
             confirmButton = {
                 Row(horizontalArrangement = Arrangement.End) {
                     TextButton(onClick = {
@@ -425,23 +427,21 @@ fun ChapterWebView(
                             context.startActivity(intent)
                         } catch (e: ActivityNotFoundException) {
                             Timber.e(e, "No activity found to handle intent for URL: $urlToShow")
-                            Toast.makeText(
-                                context, "No browser found to open the link.", Toast.LENGTH_LONG
-                            ).show()
+                            Toast.makeText(context, context.getString(R.string.error_no_browser), Toast.LENGTH_LONG).show()
                         }
                         showExternalLinkDialog = null
-                    }) { Text("Open") }
+                    }) { Text(stringResource(R.string.action_open)) }
                     TextButton(onClick = {
                         val clipboard =
                             context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
                         val clip = ClipData.newPlainText("Copied Link", urlToShow)
                         clipboard.setPrimaryClip(clip)
                         showExternalLinkDialog = null
-                    }) { Text("Copy") }
+                    }) { Text(stringResource(R.string.action_copy)) }
                 }
             },
             dismissButton = {
-                TextButton(onClick = { showExternalLinkDialog = null }) { Text("Cancel") }
+                TextButton(onClick = { showExternalLinkDialog = null }) { Text(stringResource(R.string.action_cancel)) }
             })
     }
 
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderAnnotations.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderAnnotations.kt
index 3c67a73..0538491 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderAnnotations.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderAnnotations.kt
@@ -68,7 +68,6 @@ import com.aryan.reader.epub.EpubChapter
 import org.json.JSONArray
 import org.json.JSONObject
 import java.util.UUID
-import kotlin.math.min
 
 private const val BOOKMARK_PREFS_NAME = "epub_reader_bookmarks"
 
@@ -445,10 +444,10 @@ fun PaletteManagerDialog(
             }
         },
         confirmButton = {
-            TextButton(onClick = { onSave(tempPalette) }) { Text("Save") }
+            TextButton(onClick = { onSave(tempPalette) }) { Text(stringResource(R.string.action_save)) }
         },
         dismissButton = {
-            TextButton(onClick = onDismiss) { Text("Cancel") }
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.action_cancel)) }
         }
     )
 }
@@ -528,10 +527,10 @@ fun AnnotationBottomSheet(
                 modifier = Modifier.fillMaxWidth(),
                 horizontalArrangement = Arrangement.SpaceEvenly
             ) {
-                BottomSheetToolButton(icon = R.drawable.copy, label = "Copy", onClick = onCopy, effectiveText = effectiveText)
-                BottomSheetToolButton(icon = R.drawable.dictionary, label = "Dict", onClick = onDictionary, effectiveText = effectiveText)
-                BottomSheetToolButton(icon = R.drawable.translate, label = "Translate", onClick = onTranslate, effectiveText = effectiveText)
-                BottomSheetToolButton(icon = R.drawable.search, label = "Search", onClick = onSearch, effectiveText = effectiveText)
+                BottomSheetToolButton(icon = R.drawable.copy, label = stringResource(R.string.action_copy), onClick = onCopy, effectiveText = effectiveText)
+                BottomSheetToolButton(icon = R.drawable.dictionary, label = stringResource(R.string.label_dict), onClick = onDictionary, effectiveText = effectiveText)
+                BottomSheetToolButton(icon = R.drawable.translate, label = stringResource(R.string.dict_translate), onClick = onTranslate, effectiveText = effectiveText)
+                BottomSheetToolButton(icon = R.drawable.search, label = stringResource(R.string.action_search), onClick = onSearch, effectiveText = effectiveText)
             }
 
             Spacer(Modifier.height(16.dp))
@@ -540,7 +539,7 @@ fun AnnotationBottomSheet(
             OutlinedTextField(
                 value = noteText,
                 onValueChange = { noteText = it },
-                placeholder = { Text("Add a note...", color = effectiveText.copy(alpha = 0.5f)) },
+                placeholder = { Text(stringResource(R.string.placeholder_add_note), color = effectiveText.copy(alpha = 0.5f)) },
                 modifier = Modifier
                     .fillMaxWidth()
                     .heightIn(min = 100.dp),
@@ -652,23 +651,23 @@ fun PaginatedTextSelectionMenu(
             }
 
             val actions = mutableListOf<MenuActionItem>()
-            actions.add(MenuActionItem(iconRes = R.drawable.copy, label = "Copy", onClick = onCopy))
+            actions.add(MenuActionItem(iconRes = R.drawable.copy, label = stringResource(R.string.action_copy), onClick = onCopy))
             if (onTts != null) {
-                actions.add(MenuActionItem(imageVector = Icons.AutoMirrored.Filled.VolumeUp, label = "Speak", onClick = onTts))
+                actions.add(MenuActionItem(imageVector = Icons.AutoMirrored.Filled.VolumeUp, label = stringResource(R.string.label_speak), onClick = onTts))
             }
-            actions.add(MenuActionItem(iconRes = R.drawable.dictionary, label = "Dict", onClick = onDictionary))
-            actions.add(MenuActionItem(iconRes = R.drawable.translate, label = "Translate", onClick = onTranslate))
-            actions.add(MenuActionItem(iconRes = R.drawable.search, label = "Search", onClick = onSearch))
+            actions.add(MenuActionItem(iconRes = R.drawable.dictionary, label = stringResource(R.string.label_dict), onClick = onDictionary))
+            actions.add(MenuActionItem(iconRes = R.drawable.translate, label = stringResource(R.string.dict_translate), onClick = onTranslate))
+            actions.add(MenuActionItem(iconRes = R.drawable.search, label = stringResource(R.string.action_search), onClick = onSearch))
 
             if (onNote != null) {
-                actions.add(MenuActionItem(imageVector = Icons.Default.Edit, label = "Note", onClick = onNote))
+                actions.add(MenuActionItem(imageVector = Icons.Default.Edit, label = stringResource(R.string.label_note), onClick = onNote))
             }
 
             if (onSelectAll != null) {
-                actions.add(MenuActionItem(iconRes = R.drawable.select_all, label = "Select All", onClick = onSelectAll))
+                actions.add(MenuActionItem(iconRes = R.drawable.select_all, label = stringResource(R.string.select_all), onClick = onSelectAll))
             }
             if (onDelete != null) {
-                actions.add(MenuActionItem(imageVector = Icons.Default.Delete, label = "Remove", onClick = onDelete, isError = true))
+                actions.add(MenuActionItem(imageVector = Icons.Default.Delete, label = stringResource(R.string.action_remove), onClick = onDelete, isError = true))
             }
 
             Column(modifier = Modifier.padding(bottom = 4.dp)) {
@@ -753,7 +752,7 @@ fun HighlightColorRow(
                 if (selectedColor == colorEnum) {
                     Icon(
                         imageVector = Icons.Default.Check,
-                        contentDescription = "Selected",
+                        contentDescription = stringResource(R.string.content_desc_selected),
                         tint = if (colorEnum == HighlightColor.WHITE || colorEnum == HighlightColor.YELLOW) Color.Black else Color.White,
                         modifier = Modifier.size(18.dp)
                     )
@@ -825,13 +824,13 @@ fun PaginatedTextSelectionMenu(
                         Row(verticalAlignment = Alignment.CenterVertically) {
                             Icon(
                                 imageVector = Icons.Default.Edit,
-                                contentDescription = "Note",
+                                contentDescription = stringResource(R.string.label_note),
                                 tint = MaterialTheme.colorScheme.primary,
                                 modifier = Modifier.size(14.dp)
                             )
                             Spacer(Modifier.width(6.dp))
                             Text(
-                                "Note",
+                                stringResource(R.string.label_note),
                                 style = MaterialTheme.typography.labelSmall,
                                 color = MaterialTheme.colorScheme.primary,
                                 fontWeight = FontWeight.Bold
@@ -851,24 +850,24 @@ fun PaginatedTextSelectionMenu(
             }
 
             val actions = mutableListOf<MenuActionItem>()
-            actions.add(MenuActionItem(iconRes = R.drawable.copy, label = "Copy", onClick = onCopy))
+            actions.add(MenuActionItem(iconRes = R.drawable.copy, label = stringResource(R.string.action_copy), onClick = onCopy))
             if (onTts != null) {
-                actions.add(MenuActionItem(imageVector = Icons.AutoMirrored.Filled.VolumeUp, label = "Speak", onClick = onTts))
+                actions.add(MenuActionItem(imageVector = Icons.AutoMirrored.Filled.VolumeUp, label = stringResource(R.string.label_speak), onClick = onTts))
             }
-            actions.add(MenuActionItem(iconRes = R.drawable.dictionary, label = "Dict", onClick = onDictionary))
-            actions.add(MenuActionItem(iconRes = R.drawable.translate, label = "Translate", onClick = onTranslate))
-            actions.add(MenuActionItem(iconRes = R.drawable.search, label = "Search", onClick = onSearch))
+            actions.add(MenuActionItem(iconRes = R.drawable.dictionary, label = stringResource(R.string.label_dict), onClick = onDictionary))
+            actions.add(MenuActionItem(iconRes = R.drawable.translate, label = stringResource(R.string.dict_translate), onClick = onTranslate))
+            actions.add(MenuActionItem(iconRes = R.drawable.search, label = stringResource(R.string.action_search), onClick = onSearch))
 
             if (onNote != null) {
-                val noteLabel = if (existingNote.isNullOrBlank()) "Note" else "Edit"
+                val noteLabel = if (existingNote.isNullOrBlank()) stringResource(R.string.label_note) else stringResource(R.string.label_edit)
                 actions.add(MenuActionItem(imageVector = Icons.Default.Edit, label = noteLabel, onClick = onNote))
             }
 
             if (onSelectAll != null) {
-                actions.add(MenuActionItem(iconRes = R.drawable.select_all, label = "Select All", onClick = onSelectAll))
+                actions.add(MenuActionItem(iconRes = R.drawable.select_all, label = stringResource(R.string.select_all), onClick = onSelectAll))
             }
             if (onDelete != null) {
-                actions.add(MenuActionItem(imageVector = Icons.Default.Delete, label = "Remove", onClick = onDelete, isError = true))
+                actions.add(MenuActionItem(imageVector = Icons.Default.Delete, label = stringResource(R.string.action_remove), onClick = onDelete, isError = true))
             }
 
             Column(modifier = Modifier.padding(bottom = 4.dp)) {
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderContent.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderContent.kt
index 46df7fe..3ea0081 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderContent.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderContent.kt
@@ -19,6 +19,8 @@
  */
 package com.aryan.reader.epubreader
 
+import android.content.Context
+import com.aryan.reader.R
 import timber.log.Timber
 import com.aryan.reader.epub.EpubBook
 import com.aryan.reader.paginatedreader.LocatorConverter
@@ -40,6 +42,7 @@ data class ChapterLoadingResult(
  * the initial chunk to display based on navigation state (CFI, overrides, etc.).
  */
 suspend fun loadChapterContent(
+    context: Context,
     epubBook: EpubBook,
     chapterIndex: Int,
     chunkTargetOverride: Int?,
@@ -64,12 +67,12 @@ suspend fun loadChapterContent(
                 chunkOfElements.joinToString(separator = "\n") { it.outerHtml() }
             }
             if (chunkedList.isEmpty()) {
-                head to listOf("<body><p>This chapter is empty.</p></body>")
+                head to listOf("<body><p>${context.getString(R.string.chapter_empty)}</p></body>")
             } else {
                 head to chunkedList
             }
         } else {
-            "" to listOf("<h1>Chapter not found</h1>")
+            "" to listOf("<h1>${context.getString(R.string.chapter_not_found)}</h1>")
         }
 
         var targetChunk = 0
@@ -104,7 +107,7 @@ suspend fun loadChapterContent(
         Timber.e(e, "Failed to parse chapter")
         ChapterLoadingResult(
             head = "",
-            chunks = listOf("<h1>Error loading chapter</h1><p>${e.message}</p>"),
+            chunks = listOf("<h1>${context.getString(R.string.error_loading_chapter)}</h1><p>${e.message}</p>"),
             startChunkIndex = 0,
             isSuccess = false,
             errorMessage = e.message
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt
index 7acead9..dc529db 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt
@@ -277,7 +277,7 @@ fun EpubReaderTopBar(
                             onDismissRequest = { showMoreMenu = false }
                         ) {
                             DropdownMenuItem(
-                                text = { Text("Customize Toolbar") },
+                                text = { Text(stringResource(R.string.title_customize_toolbar)) },
                                 onClick = {
                                     showMoreMenu = false
                                     onCustomizeTools()
@@ -1078,7 +1078,7 @@ fun AutoScrollControls(
                         ) {
                             Icon(
                                 imageVector = if (isPlaying) Icons.Default.Pause else Icons.Default.PlayArrow,
-                                contentDescription = if (isPlaying) stringResource(R.string.content_desc_pause_playback) else stringResource(R.string.content_desc_start_playback),
+                                contentDescription = if (isPlaying) stringResource(R.string.tooltip_tts_pause) else stringResource(R.string.content_desc_start_playback),
                                 modifier = Modifier.size(20.dp)
                             )
                         }
@@ -1395,7 +1395,7 @@ fun CustomizeToolsSheet(
             )
             Spacer(modifier = Modifier.height(8.dp))
             Text(
-                text = "Select the tools you want to keep visible. Unchecking a tool hides it from the UI to give you a distraction-free reading space.",
+                text = stringResource(R.string.desc_customize_toolbar),
                 style = MaterialTheme.typography.bodyMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant
             )
@@ -1495,17 +1495,19 @@ fun TtsControlsSheet(
         ttsController.sliceAndRetainPosition()
     }
 
+    val ttsSample = stringResource(R.string.tts_sample_text)
+
     ModalBottomSheet(
         onDismissRequest = onDismiss,
         contentWindowInsets = { WindowInsets.navigationBars }
     ) {
         Column(modifier = Modifier.padding(horizontal = 24.dp).padding(bottom = 24.dp)) {
-            Text("Voice Adjustments", style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold)
+            Text(stringResource(R.string.tts_voice_adjustments), style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold)
             Spacer(Modifier.height(16.dp))
 
             // Rate Slider
             Row(verticalAlignment = Alignment.CenterVertically) {
-                Text("Speed (${"%.1f".format(rate)}x)", modifier = Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
+                Text(stringResource(R.string.tts_speed_label, "%.1f".format(rate)), modifier = Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
                 IconButton(onClick = {
                     rate = 1.0f
                     ttsController.pause()
@@ -1534,7 +1536,7 @@ fun TtsControlsSheet(
 
             // Pitch Slider
             Row(verticalAlignment = Alignment.CenterVertically) {
-                Text("Pitch (${"%.1f".format(pitch)}x)", modifier = Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
+                Text(stringResource(R.string.tts_pitch_label, "%.1f".format(pitch)), modifier = Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
                 IconButton(onClick = {
                     pitch = 1.0f
                     ttsController.pause()
@@ -1568,7 +1570,7 @@ fun TtsControlsSheet(
                     if (ttsState.isPlaying) ttsController.pause()
                     tts?.setSpeechRate(rate)
                     tts?.setPitch(pitch)
-                    tts?.speak("This is how your current voice settings sound.", TextToSpeech.QUEUE_FLUSH, null, null)
+                    tts?.speak(ttsSample, TextToSpeech.QUEUE_FLUSH, null, null)
                 },
                 modifier = Modifier.fillMaxWidth(),
                 enabled = isTtsReady,
@@ -1611,14 +1613,14 @@ fun TtsControlsSheet(
                         } else {
                             Icon(
                                 painter = painterResource(if (ttsState.isPlaying) R.drawable.pause else R.drawable.play),
-                                contentDescription = if (ttsState.isPlaying) "Pause Book" else "Play Book",
+                                contentDescription = if (ttsState.isPlaying) stringResource(R.string.tts_pause_book) else stringResource(R.string.tts_resume_book),
                                 modifier = Modifier.size(32.dp)
                             )
                         }
                     }
                     Spacer(Modifier.height(8.dp))
                     Text(
-                        text = if (ttsState.isPlaying) "Pause Book" else "Resume Book",
+                        text = if (ttsState.isPlaying) stringResource(R.string.tts_pause_book) else stringResource(R.string.tts_resume_book),
                         style = MaterialTheme.typography.labelMedium,
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )
@@ -1635,7 +1637,7 @@ fun TtsControlsSheet(
             ) {
                 Icon(Icons.Default.Settings, contentDescription = null)
                 Spacer(Modifier.width(8.dp))
-                Text("System Voice / Engine Settings")
+                Text(stringResource(R.string.tts_system_settings))
             }
         }
     }
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderDrawer.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderDrawer.kt
index d89c376..9a644ec 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderDrawer.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderDrawer.kt
@@ -551,7 +551,7 @@ private fun BookmarksList(
                                     onDismissRequest = { bookmarkMenuExpandedFor = null }
                                 ) {
                                     DropdownMenuItem(
-                                        text = { Text(stringResource(R.string.menu_rename)) },
+                                        text = { Text(stringResource(R.string.action_rename)) },
                                         onClick = {
                                             showRenameBookmarkDialog = bookmark
                                             bookmarkMenuExpandedFor = null
@@ -680,12 +680,12 @@ private fun HighlightsList(
                 androidx.compose.material3.FilterChip(
                     selected = !filterWithNotesOnly,
                     onClick = { filterWithNotesOnly = false },
-                    label = { Text("All") }
+                    label = { Text(stringResource(R.string.filter_all)) }
                 )
                 androidx.compose.material3.FilterChip(
                     selected = filterWithNotesOnly,
                     onClick = { filterWithNotesOnly = true },
-                    label = { Text("With Notes") }
+                    label = { Text(stringResource(R.string.filter_with_notes)) }
                 )
             }
 
@@ -773,7 +773,7 @@ private fun HighlightsList(
                                         )
                                         HorizontalDivider()
                                         DropdownMenuItem(
-                                            text = { Text(if (highlight.note.isNullOrBlank()) "Add Note" else "Edit Note") },
+                                            text = { Text(if (highlight.note.isNullOrBlank()) stringResource(R.string.menu_add_note) else stringResource(R.string.menu_edit_note)) },
                                             onClick = {
                                                 onEditNote(highlight)
                                                 highlightMenuExpandedFor = null
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderScreen.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderScreen.kt
index de7cbe0..8d35ef4 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderScreen.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderScreen.kt
@@ -702,7 +702,7 @@ fun EpubReaderHost(
             if (!selectedDictPackage.isNullOrEmpty()) {
                 ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, word)
             } else {
-                Toast.makeText(context, "Please select a dictionary app first.", Toast.LENGTH_SHORT).show()
+                Toast.makeText(context, context.getString(R.string.toast_select_dictionary_first), Toast.LENGTH_SHORT).show()
                 showDictionarySettingsSheet = true
             }
         }
@@ -712,7 +712,7 @@ fun EpubReaderHost(
         if (!selectedTranslatePackage.isNullOrEmpty()) {
             ExternalDictionaryHelper.launchTranslate(context, selectedTranslatePackage!!, text)
         } else {
-            Toast.makeText(context, "Please select a translate app first.", Toast.LENGTH_SHORT).show()
+            Toast.makeText(context, context.getString(R.string.toast_select_translate_first), Toast.LENGTH_SHORT).show()
             showDictionarySettingsSheet = true
         }
     }
@@ -721,7 +721,7 @@ fun EpubReaderHost(
         if (!selectedSearchPackage.isNullOrEmpty()) {
             ExternalDictionaryHelper.launchSearch(context, selectedSearchPackage!!, text)
         } else {
-            Toast.makeText(context, "Please select a search app first.", Toast.LENGTH_SHORT).show()
+            Toast.makeText(context, context.getString(R.string.toast_select_search_first), Toast.LENGTH_SHORT).show()
             showDictionarySettingsSheet = true
         }
     }
@@ -1371,6 +1371,7 @@ fun EpubReaderHost(
         activeFragmentId = null
 
         val result = loadChapterContent(
+            context = context,
             epubBook = epubBook,
             chapterIndex = currentChapterIndex,
             chunkTargetOverride = chunkTargetOverride,
@@ -2835,7 +2836,7 @@ fun EpubReaderHost(
 
                                 if (pullToTurnEnabled && currentChapterIndex > 0) {
                                     ChapterChangeIndicator(
-                                        text = "Release for Previous Chapter",
+                                        text = stringResource(R.string.release_for_previous_chapter),
                                         progress = pullToPrevProgress,
                                         isPullingDown = true,
                                         modifier = Modifier
@@ -2846,7 +2847,7 @@ fun EpubReaderHost(
 
                                 if (pullToTurnEnabled && currentChapterIndex < chapters.size - 1) {
                                     ChapterChangeIndicator(
-                                        text = "Release for Next Chapter",
+                                        text = stringResource(R.string.release_for_next_chapter),
                                         progress = pullToNextProgress,
                                         isPullingDown = false,
                                         modifier = Modifier
diff --git a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderSettings.kt b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderSettings.kt
index 4cadb06..d3a79df 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/EpubReaderSettings.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/EpubReaderSettings.kt
@@ -481,7 +481,7 @@ fun ReaderTextFormatPanel(
 
                 // FONT & ALIGNMENT SECTION
                 Text(
-                    text = "FONT & ALIGNMENT",
+                    text = stringResource(R.string.section_font_alignment),
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.primary,
                     fontWeight = FontWeight.Bold,
@@ -504,7 +504,7 @@ fun ReaderTextFormatPanel(
                     ) {
                         Row(verticalAlignment = Alignment.CenterVertically) {
                             Text(
-                                text = "Aa",
+                                text = stringResource(R.string.label_aa_preview),
                                 style = MaterialTheme.typography.titleMedium,
                                 fontWeight = FontWeight.Bold,
                                 color = MaterialTheme.colorScheme.onSecondaryContainer,
@@ -570,7 +570,7 @@ fun ReaderTextFormatPanel(
 
                 // LAYOUT & SPACING SECTION
                 Text(
-                    text = "LAYOUT & SPACING",
+                    text = stringResource(R.string.section_layout_spacing),
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.primary,
                     fontWeight = FontWeight.Bold,
@@ -581,7 +581,7 @@ fun ReaderTextFormatPanel(
                 Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
                     // Size
                     Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                        Text("Font Size", style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
+                        Text(stringResource(R.string.label_font_size), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
                         Slider(
                             value = currentFontSize,
                             onValueChange = onFontSizeChange,
@@ -589,11 +589,11 @@ fun ReaderTextFormatPanel(
                             steps = 24,
                             modifier = Modifier.weight(1f)
                         )
-                        Text(if (currentFontSize in 0.99f..1.01f) "Orig" else "%.1fx".format(currentFontSize), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
+                        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("Line Height", style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
+                        Text(stringResource(R.string.label_line_height), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
                         Slider(
                             value = currentLineHeight,
                             onValueChange = onLineHeightChange,
@@ -601,11 +601,11 @@ fun ReaderTextFormatPanel(
                             steps = 19,
                             modifier = Modifier.weight(1f)
                         )
-                        Text(if (currentLineHeight <= 1.01f) "Orig" else "%.1fx".format(currentLineHeight), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
+                        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("Paragraph Gap", style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
+                        Text(stringResource(R.string.label_paragraph_gap), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp))
                         Slider(
                             value = currentParagraphGap,
                             onValueChange = onParagraphGapChange,
@@ -613,7 +613,7 @@ fun ReaderTextFormatPanel(
                             steps = 29,
                             modifier = Modifier.weight(1f)
                         )
-                        Text(if (currentParagraphGap in 0.99f..1.01f) "Orig" else "%.1fx".format(currentParagraphGap), style = MaterialTheme.typography.labelMedium, modifier = Modifier.width(40.dp), textAlign = TextAlign.End)
+                        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)
                     }
                 }
                 Spacer(Modifier.height(8.dp))
diff --git a/app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt b/app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt
index beda0b2..0619933 100644
--- a/app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt
+++ b/app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt
@@ -11,6 +11,7 @@ import android.os.Build
 import android.widget.Toast
 import timber.log.Timber
 import androidx.core.net.toUri
+import com.aryan.reader.R
 
 data class ExternalDictionaryApp(
     val label: String,
@@ -72,7 +73,7 @@ object ExternalDictionaryHelper {
         sortedApps.add(
             0,
             ExternalDictionaryApp(
-                label = "Search",
+                label = context.getString(R.string.dict_app_label_search),
                 packageName = GOOGLE_SEARCH_PKG,
                 icon = null
             )
@@ -127,7 +128,7 @@ object ExternalDictionaryHelper {
 
         } catch (e: Exception) {
             Timber.e(e, "Failed to launch dictionary app: $packageName")
-            Toast.makeText(context, "Error opening dictionary", Toast.LENGTH_SHORT).show()
+            Toast.makeText(context, context.getString(R.string.error_opening_dictionary), Toast.LENGTH_SHORT).show()
         }
     }
 
@@ -172,7 +173,7 @@ object ExternalDictionaryHelper {
             launchGenericSend(context, packageName, query)
         } catch (e: Exception) {
             Timber.e(e, "Failed to launch translate app: $packageName")
-            Toast.makeText(context, "Error opening translate app", Toast.LENGTH_SHORT).show()
+            Toast.makeText(context, context.getString(R.string.error_opening_translate), Toast.LENGTH_SHORT).show()
         }
     }
 
@@ -210,7 +211,7 @@ object ExternalDictionaryHelper {
             launchGenericSend(context, packageName, query)
         } catch (e: Exception) {
             Timber.e(e, "Failed to launch search app: $packageName")
-            Toast.makeText(context, "Error opening search app", Toast.LENGTH_SHORT).show()
+            Toast.makeText(context, context.getString(R.string.error_opening_search), Toast.LENGTH_SHORT).show()
         }
     }
 
diff --git a/app/src/main/java/com/aryan/reader/pdf/AnnotationDock.kt b/app/src/main/java/com/aryan/reader/pdf/AnnotationDock.kt
index 2b43eb0..55782f0 100644
--- a/app/src/main/java/com/aryan/reader/pdf/AnnotationDock.kt
+++ b/app/src/main/java/com/aryan/reader/pdf/AnnotationDock.kt
@@ -51,6 +51,7 @@ import androidx.compose.ui.graphics.RectangleShape
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.selected
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.dp
@@ -112,7 +113,7 @@ fun AnnotationDock(
                 ) {
                     Icon(
                         imageVector = Icons.Default.Close,
-                        contentDescription = "Close Edit Mode",
+                        contentDescription = stringResource(R.string.content_desc_close_edit_mode),
                         tint = Color.White,
                         modifier = Modifier.size(iconSize)
                     )
@@ -130,7 +131,7 @@ fun AnnotationDock(
                 ) {
                     Icon(
                         imageVector = visIcon,
-                        contentDescription = "Toggle Visibility",
+                        contentDescription = stringResource(R.string.content_desc_toggle_visibility),
                         tint = visTint,
                         modifier = Modifier.size(iconSize)
                     )
@@ -166,7 +167,7 @@ fun AnnotationDock(
                         ) {
                             Icon(
                                 imageVector = iconVector,
-                                contentDescription = "Stylus Only Mode",
+                                contentDescription = stringResource(R.string.content_desc_stylus_only_mode),
                                 tint = iconTint,
                                 modifier = Modifier.size(iconSize)
                             )
@@ -182,7 +183,7 @@ fun AnnotationDock(
                         iconRes = R.drawable.pen,
                         isActive = isPenActive,
                         tintColor = if(isMinimized) Color.Gray else activePenColor,
-                        description = "Pen",
+                        description = stringResource(R.string.content_desc_pen),
                         size = buttonSize,
                         iconSize = iconSize,
                         onClick = {
@@ -202,7 +203,7 @@ fun AnnotationDock(
                         iconRes = R.drawable.marker,
                         isActive = isHighlighterActive,
                         tintColor = if(isMinimized) Color.Gray else activeHighlighterColor.copy(alpha = 1f),
-                        description = "Highlighter",
+                        description = stringResource(R.string.content_desc_highlighter),
                         size = buttonSize,
                         iconSize = iconSize,
                         onClick = {
@@ -221,7 +222,7 @@ fun AnnotationDock(
                         iconRes = R.drawable.keyboard,
                         isActive = !isMinimized && selectedTool == InkType.TEXT,
                         tintColor = if(isMinimized) Color.Gray else Color.White,
-                        description = "Text",
+                        description = stringResource(R.string.content_desc_text),
                         size = buttonSize,
                         iconSize = iconSize,
                         onClick = { if(!isMinimized) onToolClick(InkType.TEXT) }
@@ -232,7 +233,7 @@ fun AnnotationDock(
                         iconRes = R.drawable.eraser,
                         isActive = !isMinimized && selectedTool == InkType.ERASER,
                         tintColor = if(isMinimized) Color.Gray else Color.White,
-                        description = "Eraser",
+                        description = stringResource(R.string.content_desc_eraser),
                         size = buttonSize,
                         iconSize = iconSize,
                         onClick = { if(!isMinimized) onToolClick(InkType.ERASER) }
@@ -249,7 +250,7 @@ fun AnnotationDock(
                 ) {
                     Icon(
                         imageVector = Icons.AutoMirrored.Filled.Undo,
-                        contentDescription = "Undo",
+                        contentDescription = stringResource(R.string.content_desc_undo),
                         tint = if (canUndo && !isMinimized) Color.White else Color.White.copy(alpha = 0.3f),
                         modifier = Modifier.size(iconSize)
                     )
@@ -265,7 +266,7 @@ fun AnnotationDock(
                 ) {
                     Icon(
                         imageVector = Icons.AutoMirrored.Filled.Redo,
-                        contentDescription = "Redo",
+                        contentDescription = stringResource(R.string.content_desc_redo),
                         tint = if (canRedo && !isMinimized) Color.White else Color.White.copy(alpha = 0.3f),
                         modifier = Modifier.size(iconSize)
                     )
@@ -286,7 +287,7 @@ fun AnnotationDock(
             ) {
                 Icon(
                     imageVector = Icons.Default.VisibilityOff,
-                    contentDescription = "Show Dock",
+                    contentDescription = stringResource(R.string.content_desc_show_dock),
                     tint = Color.White,
                     modifier = Modifier.size(20.dp)
                 )
diff --git a/app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt b/app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt
index 5eea909..e421dc2 100644
--- a/app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt
+++ b/app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt
@@ -93,6 +93,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalViewConfiguration
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontWeight
@@ -1589,6 +1590,10 @@ internal fun PdfPageComposable(
         }
     }
 
+    val errorSelection = stringResource(R.string.error_selection)
+    val errorOcrSelection = stringResource(R.string.error_ocr_selection)
+    val errorProcessingPage = stringResource(R.string.error_processing_page)
+
     BoxWithConstraints(
         modifier = modifier
             .onGloballyPositioned { layoutCoordinates = it }
@@ -2359,8 +2364,7 @@ internal fun PdfPageComposable(
                                             Timber.e(
                                                 e, "Long press: Error during OCR text selection"
                                             )
-                                            pageErrorMessage =
-                                                "OCR selection error: ${e.localizedMessage}"
+                                            pageErrorMessage = errorOcrSelection
                                         } finally {
                                             isPerformingOcrForSelection = false
                                             ocrRipplePosition = null
@@ -2381,7 +2385,7 @@ internal fun PdfPageComposable(
                                         e,
                                         "Error during long press text selection on page $pageIndex"
                                     )
-                                    pageErrorMessage = "Selection error: ${e.localizedMessage}"
+                                    pageErrorMessage = errorSelection
                                     customMenuState = null
                                     selectionCharRange.value = null
                                     selectedWordScreenRects = emptyList()
@@ -3467,7 +3471,7 @@ internal fun PdfPageComposable(
                         }
                     } catch (e: Exception) {
                         if (e is CancellationException) throw e
-                        pageErrorMessage = "Error processing page: ${e.localizedMessage}"
+                        pageErrorMessage = errorProcessingPage
                     } finally {
                         isLoadingPage = false
                         localBitmap?.recycle()
@@ -3869,7 +3873,7 @@ internal fun PdfPageComposable(
 
                 else -> {
                     Text(
-                        text = "Unable to display page ${pageIndex + 1}.",
+                        text = stringResource(R.string.error_unable_to_display_page),
                         modifier = Modifier
                             .padding(16.dp)
                             .align(Alignment.Center)
diff --git a/app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt b/app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt
index bd36835..be15ffa 100644
--- a/app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt
+++ b/app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt
@@ -1412,7 +1412,7 @@ fun PdfViewerScreen(
         } catch (e: Exception) {
             Timber.tag("PdfPrint").e(e, "Failed to initialize print job")
             coroutineScope.launch {
-                snackbarHostState.showSnackbar("Could not open print settings")
+                snackbarHostState.showSnackbar(context.getString(R.string.error_open_print_settings))
             }
         }
     }
@@ -5593,10 +5593,10 @@ fun PdfViewerScreen(
                                             verticalReaderState.currentPage
                                         }
                                     val titleText = when {
-                                        isLoadingDocument -> "Loading PDF..."
-                                        errorMessage != null -> "Error loading PDF"
+                                        isLoadingDocument -> stringResource(R.string.loading_pdf)
+                                        errorMessage != null -> stringResource(R.string.error_loading_pdf)
                                         totalPages > 0 && pagerState.pageCount > 0 -> "Page ${currentPageForDisplay + 1} of $totalPages"
-                                        totalPages > 0 && pagerState.pageCount == 0 -> "Loading page..."
+                                        totalPages > 0 && pagerState.pageCount == 0 -> stringResource(R.string.loading_page)
                                         else -> "PDF Viewer"
                                     }
                                     Text(
@@ -5610,12 +5610,12 @@ fun PdfViewerScreen(
 
                                     if (!hiddenTools.contains(PdfReaderTool.THEME.name)) {
                                         TooltipIconButton(
-                                            text = "Theme",
-                                            description = "Theme Settings",
+                                            text = stringResource(R.string.tooltip_theme),
+                                            description = stringResource(R.string.tooltip_theme_desc),
                                             onClick = { showThemePanel = true }) {
                                             Icon(
                                                 painter = painterResource(id = R.drawable.palette),
-                                                contentDescription = "Theme Settings",
+                                                contentDescription = stringResource(R.string.tooltip_theme_desc),
                                                 tint = MaterialTheme.colorScheme.onSurfaceVariant
                                             )
                                         }
@@ -5637,7 +5637,7 @@ fun PdfViewerScreen(
                                             }) {
                                             Icon(
                                                 imageVector = if (isScrollLocked) Icons.Default.Lock else Icons.Default.LockOpen,
-                                                contentDescription = if (isScrollLocked) "Unlock Panning" else "Lock Panning",
+                                                contentDescription = if (isScrollLocked) stringResource(R.string.tooltip_unlock_pan) else stringResource(R.string.tooltip_lock_pan),
                                                 tint = MaterialTheme.colorScheme.onSurfaceVariant
                                             )
                                         }
@@ -5674,7 +5674,7 @@ fun PdfViewerScreen(
 
                                     if (BuildConfig.DEBUG) {
                                         TooltipIconButton(
-                                            text = "Pen Playground",
+                                            text = stringResource(R.string.pen_playground),
                                             onClick = { showPenPlayground = true }) {
                                             Icon(
                                                 imageVector = Icons.Default.Star,
@@ -5683,7 +5683,7 @@ fun PdfViewerScreen(
                                             )
                                         }
 
-                                        TooltipIconButton(text = "Import SVG", onClick = {
+                                        TooltipIconButton(text = stringResource(R.string.import_svg), onClick = {
                                             val page =
                                                 if (displayMode == DisplayMode.PAGINATION) pagerState.currentPage else verticalReaderState.currentPage
 
@@ -5712,16 +5712,16 @@ fun PdfViewerScreen(
                                                         }
                                                         redoStack.clear()
 
-                                                        snackbarHostState.showSnackbar("Imported ${svgAnnotations.size} SVG strokes!")
+                                                        snackbarHostState.showSnackbar(context.getString(R.string.msg_imported_svg_strokes))
                                                     } else {
-                                                        snackbarHostState.showSnackbar("Failed to import SVG or empty.")
+                                                        snackbarHostState.showSnackbar(context.getString(R.string.error_import_svg_failed))
                                                     }
                                                 }
                                             }
                                         }) {
                                             Icon(
                                                 imageVector = Icons.Default.Brush,
-                                                contentDescription = "Import SVG",
+                                                contentDescription = stringResource(R.string.import_svg),
                                                 tint = Color(0xFFE91E63)
                                             )
                                         }
@@ -5735,7 +5735,7 @@ fun PdfViewerScreen(
                                             onClick = { showMoreMenu = true }) {
                                             Icon(
                                                 imageVector = Icons.Default.MoreVert,
-                                                contentDescription = "More Options"
+                                                contentDescription = stringResource(R.string.tooltip_more_options)
                                             )
                                         }
 
@@ -5744,19 +5744,19 @@ fun PdfViewerScreen(
                                             expanded = showMoreMenu,
                                             onDismissRequest = { showMoreMenu = false }) {
                                             DropdownMenuItem(
-                                                text = { Text("Customize Toolbar") },
+                                                text = { Text(stringResource(R.string.title_customize_toolbar)) },
                                                 onClick = {
                                                     showMoreMenu = false
                                                     showCustomizeToolsSheet = true
                                                 },
                                                 leadingIcon = {
-                                                    Icon(Icons.Default.Settings, contentDescription = null, modifier = Modifier.size(20.dp))
+                                                    Icon(Icons.Default.Settings, contentDescription = stringResource(R.string.title_customize_toolbar), modifier = Modifier.size(20.dp))
                                                 }
                                             )
                                             HorizontalDivider()
                                             if (BuildConfig.IS_PRO && !hiddenTools.contains(PdfReaderTool.OCR_LANGUAGE.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("OCR Language") },
+                                                    text = { Text(stringResource(R.string.menu_ocr_language)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         hasSelectedOcrLanguage = true
@@ -5767,7 +5767,7 @@ fun PdfViewerScreen(
 
                                             if (!hiddenTools.contains(PdfReaderTool.READING_MODE.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Reading Mode: Vertical scroll") },
+                                                    text = { Text(stringResource(R.string.menu_reading_mode_vertical)) },
                                                     enabled = !isTtsSessionActive,
                                                     onClick = {
                                                         displayMode = DisplayMode.VERTICAL_SCROLL
@@ -5777,13 +5777,13 @@ fun PdfViewerScreen(
                                                         if (displayMode == DisplayMode.VERTICAL_SCROLL) {
                                                             Icon(
                                                                 imageVector = Icons.Filled.Check,
-                                                                contentDescription = "Selected"
+                                                                contentDescription = stringResource(R.string.content_desc_selected)
                                                             )
                                                         }
                                                     })
                                                 HorizontalDivider()
                                                 DropdownMenuItem(
-                                                    text = { Text("Reading Mode: Paginated") },
+                                                    text = { Text(stringResource(R.string.menu_reading_mode_paginated)) },
                                                     enabled = !isTtsSessionActive,
                                                     onClick = {
                                                         displayMode = DisplayMode.PAGINATION
@@ -5793,7 +5793,7 @@ fun PdfViewerScreen(
                                                         if (displayMode == DisplayMode.PAGINATION) {
                                                             Icon(
                                                                 imageVector = Icons.Filled.Check,
-                                                                contentDescription = "Selected"
+                                                                contentDescription = stringResource(R.string.content_desc_selected)
                                                             )
                                                         }
                                                     })
@@ -5801,7 +5801,7 @@ fun PdfViewerScreen(
                                             }
                                             if (!hiddenTools.contains(PdfReaderTool.KEEP_SCREEN_ON.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Keep Screen On") },
+                                                    text = { Text(stringResource(R.string.menu_keep_screen_on)) },
                                                     onClick = {
                                                         isKeepScreenOn = !isKeepScreenOn
                                                         saveKeepScreenOn(context, isKeepScreenOn)
@@ -5811,7 +5811,7 @@ fun PdfViewerScreen(
                                                         if (isKeepScreenOn) {
                                                             Icon(
                                                                 imageVector = Icons.Filled.Check,
-                                                                contentDescription = "Selected"
+                                                                contentDescription = stringResource(R.string.content_desc_selected)
                                                             )
                                                         }
                                                     })
@@ -5819,7 +5819,7 @@ fun PdfViewerScreen(
                                             }
                                             if (!hiddenTools.contains(PdfReaderTool.AUTO_SCROLL.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Auto Scroll") },
+                                                    text = { Text(stringResource(R.string.menu_auto_scroll)) },
                                                     enabled = !isTtsSessionActive && displayMode == DisplayMode.VERTICAL_SCROLL,
                                                     onClick = {
                                                         showMoreMenu = false
@@ -5832,7 +5832,7 @@ fun PdfViewerScreen(
                                             }
                                             if (!hiddenTools.contains(PdfReaderTool.TTS_SETTINGS.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("TTS Voice Settings") },
+                                                    text = { Text(stringResource(R.string.menu_tts_voice_settings)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         showDeviceVoiceSettingsSheet = true
@@ -5848,7 +5848,7 @@ fun PdfViewerScreen(
 
                                                 if (BuildConfig.DEBUG) {
                                                     DropdownMenuItem(
-                                                        text = { Text("TTS Settings (Debug)") },
+                                                        text = { Text(stringResource(R.string.menu_tts_settings_debug)) },
                                                         onClick = {
                                                             showMoreMenu = false
                                                             showTtsSettingsSheet = true
@@ -5867,8 +5867,8 @@ fun PdfViewerScreen(
                                             if (!hiddenTools.contains(PdfReaderTool.BOOKMARK.name)) {
                                                 DropdownMenuItem(text = {
                                                     Text(
-                                                        if (isBookmarked) "Remove bookmark"
-                                                        else "Bookmark this page"
+                                                        if (isBookmarked) stringResource(R.string.menu_remove_bookmark)
+                                                        else stringResource(R.string.menu_bookmark_this_page)
                                                     )
                                                 }, onClick = {
                                                     showMoreMenu = false
@@ -5878,7 +5878,7 @@ fun PdfViewerScreen(
                                             }
                                             if (!hiddenTools.contains(PdfReaderTool.PAGE_MANAGEMENT.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Insert Blank Page") },
+                                                    text = { Text(stringResource(R.string.menu_insert_blank_page)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         onInsertPage()
@@ -5888,7 +5888,7 @@ fun PdfViewerScreen(
                                                     virtualPages.getOrNull(currentPage) is VirtualPage.BlankPage
                                                 if (canDelete) {
                                                     DropdownMenuItem(
-                                                        text = { Text("Delete Page") },
+                                                        text = { Text(stringResource(R.string.menu_delete_page)) },
                                                         onClick = {
                                                             showMoreMenu = false
                                                             onDeletePage()
@@ -5905,9 +5905,9 @@ fun PdfViewerScreen(
                                                     text = {
                                                         Text(
                                                             when {
-                                                                isReflowingThisBook -> "Generating... ${(reflowProgressValue * 100).toInt()}%"
-                                                                hasReflowFile -> "Open Text View"
-                                                                else -> "Generate Text View"
+                                                                isReflowingThisBook -> stringResource(R.string.generating_reflow_progress)
+                                                                hasReflowFile -> stringResource(R.string.action_open_text_view)
+                                                                else -> stringResource(R.string.action_generate_text_view)
                                                             }
                                                         )
                                                     },
@@ -5964,7 +5964,7 @@ fun PdfViewerScreen(
                                             }
                                             if (!hiddenTools.contains(PdfReaderTool.SHARE.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Share") },
+                                                    text = { Text(stringResource(R.string.action_share)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         showShareDialog = true
@@ -5979,7 +5979,7 @@ fun PdfViewerScreen(
                                             }
                                             if (uiState.selectedFileType == FileType.PDF && !hiddenTools.contains(PdfReaderTool.SAVE_COPY.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Save copy to device") },
+                                                    text = { Text(stringResource(R.string.action_save_copy_to_device)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         showSaveDialog = true
@@ -5993,7 +5993,7 @@ fun PdfViewerScreen(
                                             }
                                             if (uiState.selectedFileType == FileType.PDF && !hiddenTools.contains(PdfReaderTool.PRINT.name)) {
                                                 DropdownMenuItem(
-                                                    text = { Text("Print") },
+                                                    text = { Text(stringResource(R.string.action_print)) },
                                                     onClick = {
                                                         showMoreMenu = false
                                                         onPrintDocument()
@@ -6066,7 +6066,7 @@ fun PdfViewerScreen(
                                                 },
                                                 modifier = Modifier.size(20.dp)
                                             ) {
-                                                Icon(Icons.Default.Close, contentDescription = "Close Tab", modifier = Modifier.size(16.dp), tint = contentColor)
+                                                Icon(Icons.Default.Close, contentDescription = stringResource(R.string.close_tab), modifier = Modifier.size(16.dp), tint = contentColor)
                                             }
                                         }
                                     }
@@ -6113,7 +6113,7 @@ fun PdfViewerScreen(
                                 modifier = Modifier.fillMaxWidth()
                             ) {
                                 Text(
-                                    text = "Generating Text View...",
+                                    text = stringResource(R.string.generating_text_view),
                                     style = MaterialTheme.typography.titleSmall,
                                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                                     modifier = Modifier.weight(1f)
@@ -6162,7 +6162,7 @@ fun PdfViewerScreen(
                                     )
                                     Spacer(modifier = Modifier.width(8.dp))
                                     Text(
-                                        text = "Indexing pages... ${(backgroundIndexingProgress * 100).toInt()}% done. Search results will update automatically.",
+                                        text = stringResource(R.string.msg_indexing_pages_progress),
                                         style = MaterialTheme.typography.bodySmall,
                                         color = MaterialTheme.colorScheme.onSecondaryContainer
                                     )
@@ -6358,7 +6358,7 @@ fun PdfViewerScreen(
                                 ) {
                                     Icon(
                                         painter = painterResource(id = R.drawable.slider),
-                                        contentDescription = "Navigate with slider"
+                                        contentDescription = stringResource(R.string.content_desc_navigate_slider)
                                     )
                                 }
                             }
@@ -6393,7 +6393,7 @@ fun PdfViewerScreen(
                                 ) {
                                     Icon(
                                         imageVector = Icons.Default.Search,
-                                        contentDescription = "Search"
+                                        contentDescription = stringResource(R.string.action_search)
                                     )
                                 }
                             }
@@ -6438,7 +6438,7 @@ fun PdfViewerScreen(
                                     ) {
                                         Icon(
                                             painter = painterResource(id = R.drawable.ai),
-                                            contentDescription = "AI Features"
+                                            contentDescription = stringResource(R.string.tooltip_ai)
                                         )
                                     }
                                     DropdownMenu(
@@ -6446,7 +6446,7 @@ fun PdfViewerScreen(
                                         onDismissRequest = { showAiFeaturesMenu = false }) {
                                         DropdownMenuItem(
                                             text = {
-                                                Text("Summarize Page (Page ${currentPage + 1})")
+                                                Text(stringResource(R.string.action_summarize_page))
                                             }, onClick = {
                                                 showAiFeaturesMenu = false
                                                 if (isProUser) {
@@ -6526,7 +6526,7 @@ fun PdfViewerScreen(
                                                 else painterResource(
                                                     id = R.drawable.text_to_speech
                                                 ),
-                                                contentDescription = if (isTtsSessionActive) "Stop TTS" else "Start TTS"
+                                                contentDescription = if (isTtsSessionActive) stringResource(R.string.content_desc_stop_tts) else stringResource(R.string.content_desc_start_tts)
                                             )
                                         }
 
@@ -6552,21 +6552,21 @@ fun PdfViewerScreen(
                                                     painter = painterResource(
                                                         id = if (ttsState.isPlaying) R.drawable.pause
                                                         else R.drawable.play
-                                                    ), contentDescription = if (ttsState.isPlaying) "Pause TTS"
-                                                    else "Resume TTS"
+                                                    ), contentDescription = if (ttsState.isPlaying) stringResource(R.string.content_desc_pause_tts)
+                                                    else stringResource(R.string.content_desc_resume_tts)
                                                 )
                                             }
 
                                             // Tune button for BASE mode
                                             if (currentTtsMode == TtsPlaybackManager.TtsMode.BASE) {
                                                 TooltipIconButton(
-                                                    text = "Voice Adjustments",
+                                                    text = stringResource(R.string.tts_voice_adjustments),
                                                     description = "Adjust voice speed and pitch",
                                                     onClick = { showTtsControlsSheet = true }
                                                 ) {
                                                     Icon(
                                                         imageVector = Icons.Default.Tune,
-                                                        contentDescription = "Voice Adjustments"
+                                                        contentDescription = stringResource(R.string.tts_voice_adjustments)
                                                     )
                                                 }
                                             }
@@ -6721,19 +6721,13 @@ fun PdfViewerScreen(
                                 .fillMaxSize()
                                 .then(
                                     when {
-                                        isDockDragging -> Modifier // Positioned manually
-                                        // via offset during
-                                        // drag
-                                        dockLocation == DockLocation.TOP -> Modifier // Aligned via Box
-                                        // Scope
-                                        dockLocation == DockLocation.BOTTOM -> Modifier // Aligned via Box
-                                        // Scope
-                                        else -> Modifier // Positioned manually
-                                        // via offset
+                                        isDockDragging -> Modifier
+                                        dockLocation == DockLocation.TOP -> Modifier
+                                        dockLocation == DockLocation.BOTTOM -> Modifier
+                                        else -> Modifier
                                     }
                                 )
                         ) {
-                            // Calculate drag offset to apply if floating/dragging
                             val dragModifier =
                                 if (isDockDragging || dockLocation == DockLocation.FLOATING) {
                                     Modifier.offset {
@@ -6742,10 +6736,9 @@ fun PdfViewerScreen(
                                         )
                                     }
                                 } else {
-                                    Modifier // Sticky positions use alignment below
+                                    Modifier
                                 }
 
-                            // Calculate Alignment for Sticky states
                             val alignModifier = when {
                                 isDockDragging || dockLocation == DockLocation.FLOATING -> Modifier
                                 dockLocation == DockLocation.TOP -> Modifier.align(Alignment.TopCenter)
@@ -6759,7 +6752,7 @@ fun PdfViewerScreen(
                                 } else {
                                     Modifier.padding(
                                         horizontal = 16.dp
-                                    ) // Original padding for floating capsule
+                                    )
                                 }
 
                             val paddingModifier =
@@ -7209,10 +7202,10 @@ fun PdfViewerScreen(
                 if (showPermissionRationaleDialog) {
                     AlertDialog(
                         onDismissRequest = { showPermissionRationaleDialog = false },
-                        title = { Text("Permission Required") },
+                        title = { Text(stringResource(R.string.dialog_permission_required)) },
                         text = {
                             Text(
-                                "To show playback controls while the app is in the background, please grant the notification permission."
+                                stringResource(R.string.dialog_permission_notification_desc)
                             )
                         },
                         confirmButton = {
@@ -7222,14 +7215,14 @@ fun PdfViewerScreen(
                                     permissionLauncher.launch(
                                         Manifest.permission.POST_NOTIFICATIONS
                                     )
-                                }) { Text("Continue") }
+                                }) { Text(stringResource(R.string.action_continue)) }
                         },
                         dismissButton = {
                             TextButton(
                                 onClick = {
                                     showPermissionRationaleDialog = false
                                     startTts()
-                                }) { Text("Not now") }
+                                }) { Text(stringResource(R.string.action_not_now)) }
                         })
                 }
                 if (showSummarizationUpsellDialog) {
@@ -7252,11 +7245,11 @@ fun PdfViewerScreen(
                                 onClick = {
                                     showSummarizationUpsellDialog = false
                                     onNavigateToPro()
-                                }) { Text("Learn More") }
+                                }) { Text(stringResource(R.string.action_learn_more)) }
                         },
                         dismissButton = {
                             TextButton(onClick = { showSummarizationUpsellDialog = false }) {
-                                Text("Not Now")
+                                Text(stringResource(R.string.action_not_now))
                             }
                         })
                 }
@@ -7287,13 +7280,13 @@ fun PdfViewerScreen(
                                 .padding(bottom = 16.dp)
                         ) {
                             Text(
-                                text = "Add PDF to Tab",
+                                text = stringResource(R.string.title_add_pdf_to_tab),
                                 style = MaterialTheme.typography.titleLarge,
                                 modifier = Modifier.padding(16.dp)
                             )
                             if (pdfFiles.isEmpty()) {
                                 Text(
-                                    "No other PDFs found in your library.",
+                                    stringResource(R.string.msg_no_other_pdfs_found),
                                     modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp),
                                     color = MaterialTheme.colorScheme.onSurfaceVariant
                                 )
@@ -7345,7 +7338,7 @@ fun PdfViewerScreen(
                                 if (!selectedDictPackage.isNullOrEmpty()) {
                                     ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, text)
                                 } else {
-                                    Toast.makeText(context, "Select an offline dictionary first.", Toast.LENGTH_SHORT).show()
+                                    Toast.makeText(context, context.getString(R.string.toast_select_offline_dict_first), Toast.LENGTH_SHORT).show()
                                     showDictionarySettingsSheet = true
                                 }
                             }
@@ -7358,19 +7351,19 @@ fun PdfViewerScreen(
                             painter = painterResource(id = R.drawable.ai),
                             contentDescription = null
                         )
-                    }, title = { Text("Unlock Smart Dictionary") }, text = {
+                    }, title = { Text(stringResource(R.string.ai_unlock_smart_dict)) }, text = {
                         Text(
-                            "Defining entire phrases and paragraphs up to 2000 characters is a Pro feature. Upgrade to get instant definitions for any selected text."
+                            stringResource(R.string.ai_unlock_smart_dict_desc)
                         )
                     }, confirmButton = {
                         TextButton(
                             onClick = {
                                 showDictionaryUpsellDialog = false
                                 onNavigateToPro()
-                            }) { Text("Learn More") }
+                            }) { Text(stringResource(R.string.action_learn_more)) }
                     }, dismissButton = {
                         TextButton(onClick = { showDictionaryUpsellDialog = false }) {
-                            Text("Not Now")
+                            Text(stringResource(R.string.action_not_now))
                         }
                     })
                 }
@@ -7380,12 +7373,10 @@ fun PdfViewerScreen(
                         AlertDialog(
                             onDismissRequest = { showReindexDialog = null },
                             icon = { Icon(Icons.Default.Info, contentDescription = null) },
-                            title = { Text("Re-index Document?") },
+                            title = { Text(stringResource(R.string.title_reindex_document)) },
                             text = {
                                 Text(
-                                    "You are changing the OCR script to ${newLanguage.displayName}.\n\n" +
-                                            "To ensure search accuracy, we need to clear the existing index and re-scan pages that require OCR using this new language.\n\n" +
-                                            "This will happen in the background."
+                                    stringResource(R.string.desc_reindex_document_warning)
                                 )
                             },
                             confirmButton = {
@@ -7412,11 +7403,11 @@ fun PdfViewerScreen(
                                             showOcrLanguageDialog = false
                                         }
                                     }
-                                ) { Text("Re-index") }
+                                ) { Text(stringResource(R.string.action_reindex)) }
                             },
                             dismissButton = {
                                 TextButton(onClick = { showReindexDialog = null }) {
-                                    Text("Cancel")
+                                    Text(stringResource(R.string.action_cancel))
                                 }
                             }
                         )
@@ -7625,8 +7616,8 @@ fun PdfViewerScreen(
                     val url = clickedLinkUrl!!
                     AlertDialog(
                         onDismissRequest = { clickedLinkUrl = null },
-                        title = { Text("External Link") },
-                        text = { Text("You are about to navigate to:\n$url") },
+                        title = { Text(stringResource(R.string.dialog_external_link_title)) },
+                        text = { Text(stringResource(R.string.desc_external_link_warning)) },
                         confirmButton = {
                             TextButton(
                                 onClick = {
@@ -7636,7 +7627,7 @@ fun PdfViewerScreen(
                                         Timber.e(e, "Failed to open URI")
                                     }
                                     clickedLinkUrl = null
-                                }) { Text("Visit") }
+                                }) { Text(stringResource(R.string.action_visit)) }
                         },
                         dismissButton = {
                             Row {
@@ -7644,9 +7635,9 @@ fun PdfViewerScreen(
                                     onClick = {
                                         clipboardManager.setText(AnnotatedString(url))
                                         clickedLinkUrl = null
-                                    }) { Text("Copy") }
+                                    }) { Text(stringResource(R.string.action_copy)) }
                                 TextButton(onClick = { clickedLinkUrl = null }) {
-                                    Text("Cancel")
+                                    Text(stringResource(R.string.action_cancel))
                                 }
                             }
                         })
@@ -7655,8 +7646,8 @@ fun PdfViewerScreen(
                 if (showSaveDialog) {
                     AlertDialog(
                         onDismissRequest = { showSaveDialog = false },
-                        title = { Text("Save to Device") },
-                        text = { Text("Choose format to save:") },
+                        title = { Text(stringResource(R.string.title_save_to_device)) },
+                        text = { Text(stringResource(R.string.desc_choose_format_save)) },
                         confirmButton = {
                             TextButton(
                                 onClick = {
@@ -7666,7 +7657,7 @@ fun PdfViewerScreen(
                                         originalFileName, isAnnotated = true
                                     )
                                     saveLauncher.launch(suggestedName)
-                                }) { Text("With Annotations") }
+                                }) { Text(stringResource(R.string.action_with_annotations)) }
                         },
                         dismissButton = {
                             Row {
@@ -7678,7 +7669,7 @@ fun PdfViewerScreen(
                                             originalFileName, isAnnotated = false
                                         )
                                         saveLauncher.launch(suggestedName)
-                                    }) { Text("Original") }
+                                    }) { Text(stringResource(R.string.action_original)) }
 
                                 Spacer(Modifier.width(8.dp))
 
@@ -7686,7 +7677,7 @@ fun PdfViewerScreen(
                                     onClick = {
                                         showSaveDialog = false
                                         pendingSaveMode = null
-                                    }) { Text("Cancel") }
+                                    }) { Text(stringResource(R.string.action_cancel)) }
                             }
                         })
                 }
@@ -7694,8 +7685,8 @@ fun PdfViewerScreen(
                 if (showShareDialog) {
                     AlertDialog(
                         onDismissRequest = { showShareDialog = false },
-                        title = { Text("Share PDF") },
-                        text = { Text("Choose format to share:") },
+                        title = { Text(stringResource(R.string.share_chooser_title)) },
+                        text = { Text(stringResource(R.string.desc_choose_format_share)) },
                         confirmButton = {
                             TextButton(
                                 onClick = {
@@ -7721,7 +7712,7 @@ fun PdfViewerScreen(
                                         )
                                         isShareLoading = false
                                     }
-                                }) { Text("With Annotations") }
+                                }) { Text(stringResource(R.string.action_with_annotations)) }
                         },
                         dismissButton = {
                             Row {
@@ -7742,10 +7733,10 @@ fun PdfViewerScreen(
                                             )
                                             isShareLoading = false
                                         }
-                                    }) { Text("Original") }
+                                    }) { Text(stringResource(R.string.action_original)) }
                                 Spacer(Modifier.width(8.dp))
                                 TextButton(onClick = { showShareDialog = false }) {
-                                    Text("Cancel")
+                                    Text(stringResource(R.string.action_cancel))
                                 }
                             }
                         })
@@ -7773,7 +7764,7 @@ fun PdfViewerScreen(
                                 )
                                 Spacer(modifier = Modifier.height(16.dp))
                                 Text(
-                                    text = "Preparing PDF...",
+                                    text = stringResource(R.string.msg_preparing_pdf),
                                     style = MaterialTheme.typography.bodyLarge
                                 )
                             }
@@ -8087,27 +8078,27 @@ private fun PasswordDialog(isError: Boolean, onDismiss: () -> Unit, onConfirm: (
     var password by remember { mutableStateOf("") }
     var passwordVisible by remember { mutableStateOf(false) }
 
-    AlertDialog(onDismissRequest = onDismiss, title = { Text("Password Protected") }, text = {
+    AlertDialog(onDismissRequest = onDismiss, title = { Text(stringResource(R.string.title_password_protected)) }, text = {
         Column {
-            Text("This document is encrypted. Please enter the password to view it.")
+            Text(stringResource(R.string.desc_password_protected))
             Spacer(modifier = Modifier.height(16.dp))
             OutlinedTextField(
                 value = password,
                 onValueChange = { password = it },
-                label = { Text("Password") },
+                label = { Text(stringResource(R.string.password)) },
                 singleLine = true,
                 visualTransformation = if (passwordVisible) VisualTransformation.None
                 else PasswordVisualTransformation(),
                 keyboardActions = KeyboardActions(onDone = { onConfirm(password) }),
                 isError = isError,
                 supportingText = if (isError) {
-                    { Text("Incorrect password") }
+                    { Text(stringResource(R.string.error_incorrect_password)) }
                 } else null,
                 trailingIcon = {
                     val image = if (passwordVisible) Icons.Filled.Visibility
                     else Icons.Filled.VisibilityOff
 
-                    val description = if (passwordVisible) "Hide password" else "Show password"
+                    val description = if (passwordVisible) stringResource(R.string.content_desc_hide_password) else stringResource(R.string.content_desc_show_password)
 
                     IconButton(onClick = { passwordVisible = !passwordVisible }) {
                         Icon(imageVector = image, description)
@@ -8118,9 +8109,9 @@ private fun PasswordDialog(isError: Boolean, onDismiss: () -> Unit, onConfirm: (
         }
     }, confirmButton = {
         Button(onClick = { onConfirm(password) }, enabled = password.isNotBlank()) {
-            Text("Open")
+            Text(stringResource(R.string.action_open))
         }
-    }, dismissButton = { TextButton(onClick = onDismiss) { Text("Cancel") } })
+    }, dismissButton = { TextButton(onClick = onDismiss) { Text(stringResource(R.string.action_cancel)) } })
 }
 
 @Composable
@@ -8137,13 +8128,12 @@ fun PenPlayground(onClose: () -> Unit) {
         Color.Black // Black
     )
 
-    // Dark Card Background
     Surface(
         modifier = Modifier
             .fillMaxWidth(0.95f)
             .padding(16.dp),
         shape = RoundedCornerShape(28.dp),
-        color = Color(0xFF1E1E1E), // Deep Matte Dark Grey
+        color = Color(0xFF1E1E1E),
         shadowElevation = 16.dp,
         tonalElevation = 0.dp
     ) {
@@ -8151,13 +8141,11 @@ fun PenPlayground(onClose: () -> Unit) {
             modifier = Modifier.padding(vertical = 24.dp, horizontal = 16.dp),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
-            // Header with Close Button
             Row(
                 modifier = Modifier.fillMaxWidth(),
                 horizontalArrangement = Arrangement.SpaceBetween,
                 verticalAlignment = Alignment.CenterVertically
             ) {
-                // Placeholder icon (Star) on left
                 Icon(
                     imageVector = Icons.Default.Star,
                     contentDescription = null,
@@ -8169,7 +8157,7 @@ fun PenPlayground(onClose: () -> Unit) {
                     Icon(
                         painter = painterResource(
                             id = R.drawable.close
-                        ), // Ensure you have a close icon or use Icons.Default.Close
+                        ),
                         contentDescription = "Close", tint = Color.Gray
                     )
                 }
@@ -8181,19 +8169,17 @@ fun PenPlayground(onClose: () -> Unit) {
             Row(
                 modifier = Modifier
                     .fillMaxWidth()
-                    .height(140.dp), // Height for pens + ink stroke space
+                    .height(140.dp),
                 horizontalArrangement = Arrangement.SpaceEvenly,
                 verticalAlignment = Alignment.Bottom
             ) {
                 PenType.entries.forEach { type ->
                     val isSelected = selectedPen == type
 
-                    // Selected pens float up slightly
                     val offsetY by animateDpAsState(
                         targetValue = if (isSelected) (-20).dp else 0.dp, label = "offset"
                     )
 
-                    // Selected pens scale up
                     val scale by animateFloatAsState(
                         targetValue = if (isSelected) 1.2f else 1.0f, label = "scale"
                     )
@@ -8205,13 +8191,13 @@ fun PenPlayground(onClose: () -> Unit) {
                             .scale(scale)
                             .clickable(
                                 interactionSource = remember { MutableInteractionSource() },
-                                indication = null // Remove ripple for cleaner look
+                                indication = null
                             ) { selectedPen = type }) {
                         // Drawing Area
                         Box(
                             modifier = Modifier
                                 .width(40.dp)
-                                .height(120.dp), // Tall enough for stroke + pen
+                                .height(120.dp),
                             contentAlignment = Alignment.BottomCenter
                         ) {
                             PenIcon(
@@ -8229,7 +8215,6 @@ fun PenPlayground(onClose: () -> Unit) {
 
             Spacer(Modifier.height(24.dp))
 
-            // Subtle Divider
             HorizontalDivider(
                 modifier = Modifier.padding(horizontal = 12.dp),
                 color = Color.White.copy(alpha = 0.1f),
@@ -8292,10 +8277,10 @@ private fun OcrLanguageSelectionDialog(
     onDismiss: () -> Unit,
     onLanguageSelected: (OcrLanguage) -> Unit
 ) {
-    AlertDialog(onDismissRequest = onDismiss, title = { Text("Select OCR Language") }, text = {
+    AlertDialog(onDismissRequest = onDismiss, title = { Text(stringResource(R.string.title_select_ocr_language)) }, text = {
         Column(Modifier.selectableGroup()) {
             Text(
-                "Choose the primary language/script of this document for better text recognition results.",
+                stringResource(R.string.desc_select_ocr_language),
                 style = MaterialTheme.typography.bodyMedium,
                 modifier = Modifier.padding(bottom = 8.dp)
             )
@@ -8317,7 +8302,7 @@ private fun OcrLanguageSelectionDialog(
                         )
                         Spacer(Modifier.width(8.dp))
                         Text(
-                            "You can change this later in More Options > OCR Language.",
+                            stringResource(R.string.desc_ocr_language_change_later),
                             style = MaterialTheme.typography.bodySmall,
                             color = MaterialTheme.colorScheme.onSecondaryContainer
                         )
@@ -8349,7 +8334,7 @@ private fun OcrLanguageSelectionDialog(
                 }
             }
         }
-    }, confirmButton = { TextButton(onClick = onDismiss) { Text("Cancel") } })
+    }, confirmButton = { TextButton(onClick = onDismiss) { Text(stringResource(R.string.action_cancel)) } })
 }
 
 @Composable
@@ -8454,7 +8439,7 @@ fun PdfSearchResultsPanel(
         } else {
             Column {
                 Text(
-                    text = "Results found on ${totalPageCount}+ pages",
+                    text = stringResource(R.string.msg_results_found_pages),
                     style = MaterialTheme.typography.titleSmall,
                     modifier = Modifier.padding(horizontal = 16.dp, vertical = 12.dp)
                 )
@@ -8506,7 +8491,7 @@ fun PdfSearchResultsList(
     Surface(modifier = modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
         if (results.isEmpty()) {
             Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
-                Text("No results found.", style = MaterialTheme.typography.bodyLarge)
+                Text(stringResource(R.string.search_no_results_simple), style = MaterialTheme.typography.bodyLarge)
             }
         } else {
             Column {
@@ -8555,14 +8540,14 @@ fun PdfCustomizeToolsSheet(
     ) {
         Column(modifier = Modifier.padding(horizontal = 24.dp).padding(bottom = 24.dp)) {
             Text(
-                text = "Customize Toolbar",
+                text = stringResource(R.string.title_customize_toolbar),
                 style = MaterialTheme.typography.headlineSmall,
                 fontWeight = FontWeight.Bold,
                 color = MaterialTheme.colorScheme.onSurface
             )
             Spacer(modifier = Modifier.height(8.dp))
             Text(
-                text = "Select the tools you want to keep visible. Unchecking a tool hides it from the UI to give you a distraction-free reading space.",
+                text = stringResource(R.string.desc_customize_toolbar),
                 style = MaterialTheme.typography.bodyMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant
             )
diff --git a/app/src/main/java/com/aryan/reader/pdf/TextAnnotationDock.kt b/app/src/main/java/com/aryan/reader/pdf/TextAnnotationDock.kt
index 6069695..ebd0851 100644
--- a/app/src/main/java/com/aryan/reader/pdf/TextAnnotationDock.kt
+++ b/app/src/main/java/com/aryan/reader/pdf/TextAnnotationDock.kt
@@ -97,6 +97,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.PlatformTextStyle
 import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.TextStyle
@@ -211,7 +212,6 @@ fun TextAnnotationDock(
             ) {
                 when (activePopup) {
                     ActivePopup.FONT_FAMILY -> {
-                        // Re-using the logic from your EPUB FontSelectionSheetContent but adapted for a Popup
                         Surface(
                             shape = RoundedCornerShape(16.dp),
                             color = Color(0xFF1E1E1E),
@@ -229,12 +229,12 @@ fun TextAnnotationDock(
                                     Tab(
                                         selected = selectedTabIndex == 0,
                                         onClick = { selectedTabIndex = 0 },
-                                        text = { Text("Presets", fontSize = 12.sp) }
+                                        text = { Text(stringResource(R.string.tab_presets), fontSize = 12.sp) }
                                     )
                                     Tab(
                                         selected = selectedTabIndex == 1,
                                         onClick = { selectedTabIndex = 1 },
-                                        text = { Text("Imported", fontSize = 12.sp) }
+                                        text = { Text(stringResource(R.string.tab_imported), fontSize = 12.sp) }
                                     )
                                 }
 
@@ -244,7 +244,7 @@ fun TextAnnotationDock(
                                             item {
                                                 val isSelected = currentFontName == "Default" || currentFontName == null
                                                 FontItem(
-                                                    name = "Default System Font",
+                                                    name = stringResource(R.string.font_default_system),
                                                     isSelected = isSelected,
                                                     fontFamily = FontFamily.Default,
                                                     onClick = {
@@ -281,12 +281,12 @@ fun TextAnnotationDock(
                                             ) {
                                                 Icon(Icons.Default.Add, contentDescription = null, modifier = Modifier.size(16.dp))
                                                 Spacer(Modifier.width(8.dp))
-                                                Text("Import", fontSize = 12.sp)
+                                                Text(stringResource(R.string.action_import), fontSize = 12.sp)
                                             }
 
                                             if (customFonts.isEmpty()) {
                                                 Text(
-                                                    "No fonts imported",
+                                                    stringResource(R.string.msg_no_fonts_imported),
                                                     color = Color.Gray,
                                                     modifier = Modifier.fillMaxWidth().padding(16.dp),
                                                     textAlign = TextAlign.Center,
@@ -320,7 +320,7 @@ fun TextAnnotationDock(
                     ActivePopup.COLOR -> {
                         if (activeMenuMode == ColorMenuMode.PALETTE) {
                             ColorPickerBubble(
-                                title = "Font color",
+                                title = stringResource(R.string.label_font_color),
                                 currentColor = currentStyle.color.takeIf { it != Color.Unspecified }
                                     ?: Color.Black,
                                 palette = textColorPalette,
@@ -359,7 +359,7 @@ fun TextAnnotationDock(
                     ActivePopup.BACKGROUND -> {
                         if (activeMenuMode == ColorMenuMode.PALETTE) {
                             ColorPickerBubble(
-                                title = "Highlight",
+                                title = stringResource(R.string.label_highlight_color),
                                 currentColor = when (currentStyle.background) {
                                     Color.Unspecified, Color.Transparent -> Color.Transparent
                                     else -> currentStyle.background
diff --git a/app/src/main/java/com/aryan/reader/pdf/ToolSettingsPopup.kt b/app/src/main/java/com/aryan/reader/pdf/ToolSettingsPopup.kt
index 76329d3..b88ee12 100644
--- a/app/src/main/java/com/aryan/reader/pdf/ToolSettingsPopup.kt
+++ b/app/src/main/java/com/aryan/reader/pdf/ToolSettingsPopup.kt
@@ -70,6 +70,7 @@ import androidx.compose.ui.graphics.drawscope.clipPath
 import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.selected
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.font.FontWeight
@@ -80,6 +81,7 @@ import androidx.compose.ui.window.DialogProperties
 import com.aryan.reader.BrightnessSlider
 import com.aryan.reader.ColorComparePill
 import com.aryan.reader.HexInput
+import com.aryan.reader.R
 import com.aryan.reader.RgbInputColumn
 import com.aryan.reader.SpectrumBox
 import kotlin.math.roundToInt
@@ -262,7 +264,7 @@ fun ToolSettingsPopup(
                     horizontalArrangement = Arrangement.SpaceBetween
                 ) {
                     Text(
-                        text = "Straight Line",
+                        text = stringResource(R.string.label_straight_line),
                         color = Color.White,
                         style = MaterialTheme.typography.bodyMedium
                     )
@@ -465,7 +467,7 @@ private fun ColorPickerDialog(
                         .padding(horizontal = 24.dp, vertical = 8.dp)
                 ) {
                     Text(
-                        text = "Spectrum",
+                        text = stringResource(R.string.label_spectrum),
                         style = MaterialTheme.typography.titleMedium,
                         fontWeight = FontWeight.SemiBold,
                         color = Color.White
@@ -520,7 +522,7 @@ private fun ColorPickerDialog(
                         horizontalAlignment = Alignment.CenterHorizontally
                     ) {
                         Text(
-                            "Hex",
+                            stringResource(R.string.theme_color_hex),
                             color = Color.Gray,
                             fontSize = 12.sp,
                             maxLines = 1
@@ -537,19 +539,19 @@ private fun ColorPickerDialog(
                         horizontalArrangement = Arrangement.spacedBy(6.dp)
                     ) {
                         RgbInputColumn(
-                            label = "Red",
+                            label = stringResource(R.string.color_red),
                             value = currentColor.red,
                             onValueChange = { r -> updateFromColor(currentColor.copy(red = r)) },
                             modifier = Modifier.weight(1f)
                         )
                         RgbInputColumn(
-                            label = "Green",
+                            label = stringResource(R.string.color_green),
                             value = currentColor.green,
                             onValueChange = { g -> updateFromColor(currentColor.copy(green = g)) },
                             modifier = Modifier.weight(1f)
                         )
                         RgbInputColumn(
-                            label = "Blue",
+                            label = stringResource(R.string.color_blue),
                             value = currentColor.blue,
                             onValueChange = { b -> updateFromColor(currentColor.copy(blue = b)) },
                             modifier = Modifier.weight(1f)
@@ -565,7 +567,7 @@ private fun ColorPickerDialog(
                     verticalAlignment = Alignment.CenterVertically
                 ) {
                     TextButton(onClick = onDismiss) {
-                        Text("Cancel", color = Color.Gray)
+                        Text(stringResource(R.string.action_cancel), color = Color.Gray)
                     }
                     Spacer(Modifier.width(8.dp))
                     Button(
@@ -575,7 +577,7 @@ private fun ColorPickerDialog(
                             contentColor = Color.Black
                         )
                     ) {
-                        Text("Done")
+                        Text(stringResource(R.string.action_done))
                     }
                 }
             }
diff --git a/app/src/main/res/values/plurals.xml b/app/src/main/res/values/plurals.xml
index 1429c04..8228062 100644
--- a/app/src/main/res/values/plurals.xml
+++ b/app/src/main/res/values/plurals.xml
@@ -1,17 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- Shown on book cards and in various dialogs. %1$d = number of books. -->
     <plurals name="book_count">
         <item quantity="one">%1$d book</item>
         <item quantity="other">%1$d books</item>
     </plurals>
+
+    <!-- Word-only plural (no number prefix) used in sentences. Example: "remove 3 books from shelf". -->
     <plurals name="book_word">
         <item quantity="one">book</item>
         <item quantity="other">books</item>
     </plurals>
+
+    <!-- Shown when deleting multiple shelves. %1$d = number of shelves. -->
     <plurals name="shelf_count">
         <item quantity="one">%1$d shelf</item>
         <item quantity="other">%1$d shelves</item>
     </plurals>
+
+    <!-- Shown in the search results summary bar. %1$d = total number of results found. -->
     <plurals name="search_results_count">
         <item quantity="one">%1$d result found</item>
         <item quantity="other">%1$d results found</item>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index eac908c..2255322 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,5 +1,6 @@
 <resources>
-    <string name="app_name">Episteme</string>
+    <!-- App name — brand name, must not be translated. -->
+    <string name="app_name" translatable="false">Episteme</string>
 
     <!-- General Actions & Words -->
     <string name="action_cancel">Cancel</string>
@@ -14,8 +15,8 @@
     <string name="action_search">Search</string>
     <string name="action_clear">Clear</string>
     <string name="action_apply">Apply</string>
+    <!-- Tab label in the multi-tab PDF reader — means the slot is available (unused), NOT "free of cost". -->
     <string name="tab_free">Free</string>
-    <string name="action_save_catalog">Save</string>
     <string name="active_tabs">Active Tabs</string>
     <string name="close_tab">Close Tab</string>
     <string name="close_all_tabs">Close All Tabs</string>
@@ -23,39 +24,50 @@
     <string name="dialog_close_all_tabs_desc">Are you sure you want to close all active tabs?</string>
 
     <!-- Shared Composables & Dialogs -->
+    <!-- Full legal agreement sentence. %1$s = introductory phrase (e.g. "By signing in,"); %2$s = hyperlinked "Terms of Service"; %3$s = hyperlinked "Privacy Policy". The three parts are assembled in code. -->
     <string name="legal_agreement_full">%1$s you agree to our %2$s and acknowledge you have read our %3$s.</string>
     <string name="legal_terms_of_service">Terms of Service</string>
     <string name="legal_privacy_policy">Privacy Policy</string>
     <string name="legal_licenses">Licenses</string>
+    <!-- Shown in the multi-select top bar. %1$d = number of items the user has selected. -->
     <string name="items_selected_count">%1$d selected</string>
     <string name="clear_selection">Clear Selection</string>
+    <!-- Combined toggle label for a pin/unpin action on a book. -->
     <string name="pin_unpin">Pin/Unpin</string>
     <string name="info">Info</string>
     <string name="select_all">Select All</string>
     <string name="dialog_delete_permanently">Delete File(s) Permanently</string>
     <string name="dialog_remove_from_recents">Remove from Recents</string>
     <string name="dialog_warning_folder_sync_delete">Warning: Some selected items are synced from a local folder. Proceeding will delete the actual files from your device storage.\n\nThis action cannot be undone.</string>
+    <!-- %1$d = number of selected files to permanently delete. -->
     <string name="dialog_permanently_delete_desc">Do you want to permanently delete %1$d selected file(s) from your device? This action cannot be undone.</string>
+    <!-- %1$d = number of selected files to remove from the recents list. -->
     <string name="dialog_remove_recents_desc">Do you want to remove %1$d selected file(s) from the recent files list? It will reappear if you open it again from the library.</string>
     <string name="file_information">File Information</string>
     <string name="book_name">Book Name</string>
     <string name="copy_name">Copy Name</string>
+    <!-- Shown in the file information dialog. %1$s = the original filename before the user renamed it. -->
     <string name="original_name">Original Name: %1$s</string>
     <string name="revert_to_original">Revert to Original</string>
+    <!-- Shown in the file information dialog. %1$s = the file\'s name on disk. -->
     <string name="file_name">File Name: %1$s</string>
     <string name="author">Author</string>
     <string name="format">Format</string>
     <string name="size">Size</string>
     <string name="added">Added</string>
     <string name="location">Location</string>
+    <!-- "OPDS" is a technical protocol name and must not be translated. -->
     <string name="source_opds">Source: OPDS Stream</string>
     <string name="source_in_app">In-App Storage</string>
     <string name="internal_storage">Internal storage</string>
+    <!-- "Episteme" is the app brand name and must not be translated. -->
     <string name="about_title">About Episteme</string>
+    <!-- Shown in the About dialog header. %1$s = version string (e.g. "1.0.41"); %2$d = integer build number. -->
     <string name="about_version">Version: %1$s (Build: %2$d)</string>
     <string name="empty_select_file">Select a File</string>
     <string name="clear_cloud_data_title">Clear All Synced Data?</string>
     <string name="clear_cloud_data_desc">Are you sure you want to permanently delete all of your book data from the cloud? This will also wipe your local library to prevent re-syncing. This action cannot be undone.</string>
+    <!-- Destructive action button, intentionally styled in all-caps. -->
     <string name="delete_all_data">DELETE ALL DATA</string>
 
     <!-- Navigation & Home -->
@@ -69,18 +81,25 @@
     <string name="setup_folder_sync">Setup Folder Sync</string>
     <string name="sync_folder">Sync Folder</string>
     <string name="local_folder">Local Folder</string>
-    <string name="opds_stream">OPDS Stream</string>
+    <!-- "OPDS" is the name of a catalog protocol — do not translate. -->
+    <string name="opds_stream" translatable="false">OPDS Stream</string>
     <string name="pinned">Pinned</string>
+    <!-- Reading progress shown on a book card. %1$d = percentage (0–100). %% is a literal percent sign. -->
     <string name="progress_complete">%1$d%% complete</string>
     <string name="not_available_locally">Not available locally</string>
 
     <!-- Drawer Menu -->
+    <!-- "Google" is a brand name — keep as-is. -->
     <string name="drawer_sign_in">Sign in with Google</string>
     <string name="drawer_by_signing_in">By signing in,</string>
+    <!-- "Episteme Pro" is a product tier name — do not translate "Episteme". -->
     <string name="drawer_pro_unlocked">Episteme Pro</string>
+    <!-- "Episteme Pro" is a product tier name — do not translate "Episteme". -->
     <string name="drawer_upgrade_pro">Upgrade to Episteme Pro</string>
     <string name="drawer_sync_library">Sync Library</string>
+    <!-- "Google Drive" is a brand name — do not translate. -->
     <string name="drawer_backup_local_folders">Cloud sync for Local Folders</string>
+    <!-- "Google Drive" is a brand name — do not translate. -->
     <string name="drawer_backup_desc">Upload books from your synced folders to Google Drive.</string>
     <string name="drawer_custom_fonts">Custom Fonts</string>
     <string name="drawer_help_feedback">Help &amp; Feedback</string>
@@ -89,51 +108,70 @@
     <!-- Top Bar Options -->
     <string name="options_recent_limit">Recent Files Limit</string>
     <string name="options_no_limit">No limit</string>
+    <!-- Shown as a selectable limit option. %1$d = number of files (e.g. "10 files", "25 files"). -->
     <string name="options_files_limit">%1$d files</string>
     <string name="options_clear_book_cache">Clear Book Cache</string>
     <string name="options_clear_reflow_cache">Clear Reflow Cache</string>
 
     <!-- Library Screen -->
     <string name="library_title">Library</string>
+    <!-- Placeholder text inside the library search field. -->
     <string name="search_placeholder">Search title or author…</string>
+    <!-- Active file-type filter chip label. %1$s = comma-separated list of active types (e.g. "PDF, EPUB"). -->
     <string name="filter_types">Types: %1$s</string>
+    <!-- Active folder filter chip label. %1$d = number of folder filters currently active. -->
     <string name="filter_folders">Folders: %1$d</string>
+    <!-- Active read-status filter chip label. %1$s = status name (e.g. "Unread", "In Progress"). -->
     <string name="filter_status">Status: %1$s</string>
     <string name="tab_all_books">All Books</string>
     <string name="tab_shelves">Shelves</string>
     <string name="tab_folders">Folders</string>
     <string name="tab_catalogs">Catalogs</string>
+    <!-- Shown when the library search has no matches. %1$s = the user\'s search query. -->
     <string name="no_results_found">No results found for \"%1$s\"</string>
     <string name="library_empty_desc">Select a PDF, EPUB, MOBI, or AZW3 file from your device to get started.</string>
+    <!-- Floating action button label to add a file to the library. -->
     <string name="fab_add_file">Add file</string>
+    <!-- Floating action button label to create a new shelf. -->
     <string name="fab_new_shelf">New shelf</string>
     <string name="create_new_shelf">Create New Shelf</string>
     <string name="shelf_name_hint">Shelf Name</string>
     <string name="action_create">Create</string>
     <string name="menu_rename_shelf">Rename shelf</string>
     <string name="menu_delete_shelf">Delete shelf</string>
+    <!-- Floating action button label shown inside a shelf to add books to it. -->
     <string name="fab_add_books">Add books</string>
     <string name="shelf_empty">This shelf is empty</string>
+    <!-- FAB label shown while adding books. %1$s = the name of the target shelf. -->
     <string name="add_to_shelf">Add to %1$s</string>
+    <!-- FAB button label showing count of selected books. %1$d = number selected. Intentionally all-caps. -->
     <string name="fab_add_count">ADD (%1$d)</string>
     <string name="no_unshelved_books">No unshelved books to add</string>
     <string name="all_books_in_shelf">All books are already in this shelf</string>
     <string name="dialog_rename_shelf">Rename Shelf</string>
     <string name="dialog_delete_shelf">Delete Shelf?</string>
+    <!-- Confirmation dialog. %1$s = name of the shelf being deleted. -->
     <string name="dialog_delete_shelf_desc">Are you sure you want to delete the \'%1$s\' shelf? All books will be moved to Unshelved.</string>
     <string name="dialog_remove_from_shelf">Remove from Shelf?</string>
+    <!-- Confirmation dialog. %1$d = count of books; %2$s = "book" or "books" (resolved from a plural); %3$s = shelf name. -->
     <string name="dialog_remove_from_shelf_desc">Are you sure you want to remove %1$d %2$s from the \'%3$s\' shelf? The book(s) will remain in your library and appear under Unshelved.</string>
+    <!-- Dialog title when deleting multiple shelves. %1$s = shelf name(s). -->
     <string name="dialog_delete_shelves">Delete %1$s?</string>
+    <!-- Dialog body when deleting multiple shelves. %1$d = count of selected shelves; %2$s = "shelf" or "shelves" (resolved from a plural). -->
     <string name="dialog_delete_shelves_desc">Are you sure you want to delete the %1$d selected %2$s? All books within will be moved to Unshelved.</string>
 
     <!-- Folder Sync -->
     <string name="sync_local_folders">Sync Local Folders</string>
+    <!-- "Episteme" is the app brand name — do not translate. -->
     <string name="sync_folders_desc">Connect local folders to create a live library. Episteme will monitor files and sync progress.</string>
     <string name="fab_add_folder">Add Folder</string>
     <string name="scan_all">Scan All</string>
     <string name="scanning">Scanning…</string>
+    <!-- Button label on a folder sync card — triggers syncing only the metadata (not the actual files). -->
     <string name="sync_meta">Sync Meta</string>
+    <!-- Small uppercase label on a folder sync card, followed by a date/time stamp. -->
     <string name="last_sync">LAST SYNC</string>
+    <!-- Small uppercase label on a folder sync card, followed by the count of synced books. -->
     <string name="books_count">BOOKS</string>
     <string name="menu_edit_filters">Edit Filters</string>
     <string name="menu_remove_folder">Remove Folder</string>
@@ -148,7 +186,8 @@
 
     <!-- External File Behavior -->
     <string name="external_file_prompt_title">Save File?</string>
-    <string name="external_file_prompt_desc">Do you want to save this external file in the app\'s library? If not, it will be removed.\n\n(You can change this default behavior anytime from the Home Screen > More Options > External File Behavior).</string>
+    <string name="external_file_prompt_desc">Do you want to save this external file in the app\'s library? If not, it will be removed.\n\n(You can change this default behavior anytime from the Home Screen &gt; More Options &gt; External File Behavior).</string>
+    <!-- Checkbox label — "Don\'t ask again" for the external file save prompt. -->
     <string name="external_file_dont_ask">Don\'t ask again</string>
     <string name="external_file_keep">Keep in Library</string>
     <string name="external_file_delete">Remove</string>
@@ -157,108 +196,141 @@
     <string name="external_file_behavior_delete">Always Remove</string>
     <string name="options_external_file_behavior">External File Behavior</string>
 
-    <!-- OPDS -->
+    <!-- OPDS — "OPDS" is a technical protocol name, do not translate it. -->
     <string name="fab_add_catalog">Add Catalog</string>
     <string name="search_catalog_placeholder">Search catalog…</string>
     <string name="feed_empty">This feed is empty.</string>
     <string name="status_downloading">Downloading…</string>
     <string name="status_loading">Loading…</string>
+    <!-- Button label — "Stream" means to read directly from an OPDS catalog without downloading the file first. -->
     <string name="action_stream">Stream</string>
     <string name="action_unavailable">Unavailable</string>
     <string name="action_download">Download</string>
     <string name="download_format">Download Format</string>
+    <!-- Button label — starts streaming the book immediately from the OPDS catalog. -->
     <string name="action_stream_now">Stream Now</string>
     <string name="action_read">Read</string>
     <string name="no_supported_formats">No supported formats available.</string>
+    <!-- Uppercase section label in the OPDS book detail screen. -->
     <string name="publisher">PUBLISHER</string>
+    <!-- Uppercase section label in the OPDS book detail screen. -->
     <string name="published">PUBLISHED</string>
+    <!-- Uppercase section label in the OPDS book detail screen. -->
     <string name="language">LANGUAGE</string>
     <string name="synopsis">Synopsis</string>
     <string name="edit_catalog">Edit Catalog</string>
+    <!-- "OPDS" is a technical protocol name — do not translate. -->
     <string name="add_opds_catalog">Add OPDS Catalog</string>
     <string name="catalog_name">Catalog Name</string>
     <string name="url">URL</string>
-    <string name="url_placeholder">http://192.168.1.50:8080/opds</string>
+    <!-- Placeholder text for the catalog URL input field. This is an example address — do not translate. -->
+    <string name="url_placeholder" translatable="false">http://192.168.1.50:8080/opds</string>
     <string name="auth_optional">Authentication (Optional)</string>
     <string name="username">Username</string>
     <string name="password">Password</string>
     <string name="delete_catalog">Delete Catalog</string>
+    <!-- Confirmation dialog. %1$s = the name of the catalog being deleted. -->
     <string name="delete_catalog_desc">Are you sure you want to delete \'%1$s\'?</string>
+    <!-- Warning shown when deleting a catalog that has associated streaming books. %1$d = number of streaming books that will also be removed from the library. -->
     <string name="delete_catalog_warning">Deleting this catalog will also permanently remove %1$d streaming books associated with it from your library.</string>
+    <!-- Label for a preset badge/chip shown on OPDS catalog entries. -->
     <string name="preset_label">Preset</string>
 
     <!-- Pro Screen -->
     <string name="free_plan">Free Plan</string>
-    <string name="price_free">$0</string>
+    <!-- Price displayed on the free plan card — "$0" should remain as-is. -->
+    <string name="price_free" translatable="false">$0</string>
     <string name="forever_free">Forever free</string>
     <string name="feature_multiple_formats">Multiple Formats</string>
+    <!-- File format names (PDF, EPUB, MOBI, AZW3) are technical identifiers — do not translate them. -->
     <string name="feature_multiple_formats_desc">Supports PDF, EPUB, MOBI, AZW3</string>
+    <!-- "Android" is a brand name — do not translate. TTS = Text-to-Speech (keep as abbreviation). -->
     <string name="feature_tts">Android Text-to-Speech</string>
     <string name="feature_tts_desc">Listen to your books with built-in TTS</string>
     <string name="feature_dict">Basic Dictionary</string>
     <string name="feature_dict_desc">Look up single words quickly</string>
     <string name="current_plan">Current Plan</string>
-    <string name="pro_sale_off">50%% OFF</string>
+    <!-- Promotional badge displayed on the Pro plan card. %% is a literal percent sign. -->
+    <string name="pro_sale_off" translatable="false">50%% OFF</string>
     <string name="loading_price">Loading price…</string>
     <string name="one_time_payment">One-time payment</string>
     <string name="lifetime_access">Lifetime Access</string>
     <string name="early_access_sale">Early Access Sale</string>
     <string name="pro_includes">Everything in Free, plus:</string>
     <string name="feature_cloud_sync">Cloud Sync Across Devices</string>
+    <!-- "Google Drive" is a brand name — do not translate. -->
     <string name="feature_cloud_sync_desc">Keep your entire library, including book files and reading progress, synced across up to 4 devices.</string>
+    <!-- "Summarization" is a Pro AI feature name. -->
     <string name="feature_summarize">Summarization</string>
     <string name="feature_summarize_desc">Get quick summaries of chapters or pages</string>
+    <!-- "Smart Dictionary" is a Pro AI feature name. -->
     <string name="feature_smart_dict">Smart Dictionary</string>
     <string name="feature_smart_dict_desc">Search phrases and even paragraphs, not just single words</string>
     <string name="feature_priority">Priority Feature Requests</string>
     <string name="feature_priority_desc">Your suggestions get prioritized</string>
+    <!-- "Pro" refers to the Episteme Pro product tier. -->
     <string name="pro_unlocked">Pro Features Unlocked!</string>
     <string name="sign_in_required">Sign in Required</string>
     <string name="verifying_purchase">Verifying purchase…</string>
     <string name="existing_purchase_found">Existing Purchase Found</string>
     <string name="get_lifetime_access">Get Lifetime Access</string>
     <string name="upgrade_unavailable">Upgrade currently unavailable. Please check your internet and try again.</string>
+    <!-- "Google" is a brand name. "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="sign_in_to_purchase">Please sign in to your Google account to purchase Episteme Pro.</string>
     <string name="verifying_purchase_desc">This may take a few moments. Your Pro status will be updated automatically.</string>
+    <!-- "Pro" refers to the Episteme Pro product tier. -->
     <string name="dialog_existing_purchase_desc">This device already has a Pro purchase, but it\'s linked to a different account. Please sign in to the account that was used for the original purchase to restore your Pro features.</string>
+    <!-- "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="dialog_early_access_desc">You\'re getting Episteme Pro at a special discounted price during our early access period! This is a limited-time offer.</string>
+    <!-- "Google" is a brand name. "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="dialog_sign_in_required_desc">Please sign in to your Google account to purchase Episteme Pro and unlock all premium features.</string>
+    <!-- Dismissal button label for various pro-upgrade prompt dialogs. -->
     <string name="action_not_now">Not Now</string>
+    <!-- Confirmation button label for informational dialogs. -->
     <string name="action_got_it">Got It!</string>
 
     <!-- Fonts -->
     <string name="custom_fonts">Custom Fonts</string>
     <string name="import_font">Import Font</string>
     <string name="no_custom_fonts">No Custom Fonts</string>
+    <!-- TTF and OTF are font file format names — do not translate. -->
     <string name="import_fonts_desc">Import TTF or OTF files to use them in your books.</string>
-    <string name="font_preview_text">Grumpy wizards make toxic brew for the evil queen! 1234567890 ?.,;:</string>
+    <!-- English pangram used to preview all letters in a font. Translating this defeats the purpose — keep in English. -->
+    <string name="font_preview_text" translatable="false">Grumpy wizards make toxic brew for the evil queen! 1234567890 ?.,;:</string>
     <string name="font_preview_error">Preview unavailable (Invalid font file)</string>
     <string name="dialog_delete_font">Delete Font?</string>
+    <!-- Confirmation dialog. %1$s = display name of the font being deleted. -->
     <string name="dialog_delete_font_desc">Are you sure you want to delete \'%1$s\'? This will remove it from all your devices if sync is on.</string>
 
     <!-- Feedback -->
     <string name="get_in_touch">Get in Touch</string>
-    <string name="feedback_desc">Found a bug, have a feature request, or just want to say hi? Let us know on GitHub or send us an email.</string>
+    <string name="feedback_desc">Found a bug, have a feature request, or just want to say hi? Let us know on GitHub or email us.</string>
     <string name="github_issues">GitHub Issues</string>
     <string name="github_issues_desc">Report bugs, request features, and track development progress.</string>
     <string name="email_support">Email Support</string>
     <string name="email_support_desc">Contact us directly via email for any other inquiries.</string>
 
     <!-- Dialogs -->
+    <!-- "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="dialog_unlock_pro">Unlock Episteme Pro</string>
+    <!-- "Pro" refers to the Episteme Pro product tier. -->
     <string name="dialog_unlock_pro_desc">Sync across devices is a Pro feature. Unlock all pro features with a single, one-time purchase.</string>
     <string name="action_upgrade">Upgrade</string>
     <string name="dialog_confirm_sign_out">Confirm Sign Out</string>
     <string name="dialog_confirm_sign_out_desc">Are you sure you want to sign out?</string>
     <string name="device_limit_reached">Device Limit Reached</string>
+    <!-- "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="device_limit_reached_desc">To use Episteme Pro on this device, please remove one of your existing registered devices.</string>
+    <!-- Shown in the device management list. %1$s = a formatted relative date/time string (e.g. "2 days ago"). -->
     <string name="last_seen">Last seen: %1$s</string>
     <string name="dialog_destructive_action">Confirm Destructive Action</string>
+    <!-- "Google Drive" is a brand name — do not translate. -->
     <string name="dialog_destructive_action_desc">This will permanently delete all your books and reading progress from this device AND from your Google Drive account. This action cannot be undone. Are you sure?</string>
     <string name="dialog_clear_book_cache">Clear Book Cache</string>
     <string name="dialog_clear_book_cache_desc">This will clear all processed pages in pagination mode. This helps fix layout issues but will require books to be re-processed next time you open them.</string>
     <string name="action_confirm_clear">Confirm &amp; Clear</string>
     <string name="dialog_clear_reflow_cache">Clear Reflow Cache</string>
+    <!-- "Text View" is the name of the PDF reflow feature in this app — keep consistent. -->
     <string name="dialog_clear_reflow_cache_desc">This will delete all generated \'Text View\' versions of your PDFs and clear their associated images/HTML cache. Your original PDFs will remain untouched.</string>
 
     <!-- Tooltip titles -->
@@ -266,11 +338,15 @@
     <string name="tooltip_dictionary">Dictionary</string>
     <string name="tooltip_more_options">More Options</string>
     <string name="tooltip_slider">Page Slider</string>
+    <!-- TOC = Table of Contents. -->
     <string name="tooltip_toc">Table of Contents</string>
     <string name="tooltip_format">Text Format</string>
     <string name="tooltip_search">Search</string>
+    <!-- AI = Artificial Intelligence. This is a toolbar icon tooltip. -->
     <string name="tooltip_ai">AI Features</string>
+    <!-- TTS = Text-to-Speech. -->
     <string name="tooltip_tts_start">Start Text-to-Speech</string>
+    <!-- TTS = Text-to-Speech. -->
     <string name="tooltip_tts_stop">Stop Text-to-Speech</string>
     <string name="tooltip_tts_pause">Pause</string>
     <string name="tooltip_tts_resume">Resume</string>
@@ -298,12 +374,15 @@
     <string name="tooltip_toc_desc">Browse chapters and navigate to any section</string>
     <string name="tooltip_format_desc">Adjust font, size, line height, alignment, and custom fonts</string>
     <string name="tooltip_search_desc">Find any word or phrase in this book</string>
+    <!-- AI = Artificial Intelligence. -->
     <string name="tooltip_ai_desc">Summarize the current chapter or page using AI</string>
     <string name="tooltip_tts_start_desc">Read the book aloud using your device\'s voice engine</string>
     <string name="tooltip_tts_stop_desc">Stop the current read-aloud session</string>
     <string name="tooltip_tts_pause_desc">Pause the current read-aloud playback</string>
     <string name="tooltip_tts_resume_desc">Resume paused read-aloud playback</string>
+    <!-- PDF = Portable Document Format (file format name — do not translate). -->
     <string name="tooltip_dark_mode_on_desc">Invert PDF colors for dark mode</string>
+    <!-- PDF = Portable Document Format (file format name — do not translate). -->
     <string name="tooltip_dark_mode_off_desc">Disable dark mode and restore the original PDF colors</string>
     <string name="tooltip_lock_pan_desc">Lock horizontal panning on the page</string>
     <string name="tooltip_unlock_pan_desc">Unlock panning to re-enable pinch-to-zoom and drag gestures</string>
@@ -322,41 +401,66 @@
     <string name="action_sign_in">Sign In</string>
     <string name="action_select_folder">Select Folder</string>
     <string name="action_select">Select</string>
+    <!-- Footer combining Privacy Policy, Terms of Service, and Licenses links separated by bullet points. "•" is punctuation — keep as-is or adapt spacing to your language. -->
     <string name="legal_footer_combined">Privacy Policy  •  Terms of Service  •  Licenses</string>
-    <string name="app_name_oss">Episteme OSS</string>
-    <string name="debug_show_device_management">[Debug] Show Device Management</string>
-    <string name="debug_clear_cloud_local_data">[Debug] Clear Cloud &amp; Local Data</string>
-    <string name="debug_fps">FPS: %1$d</string>
+    <!-- OSS = Open Source Software. "Episteme" is the app brand name — do not translate. -->
+    <string name="app_name_oss" translatable="false">Episteme OSS</string>
+    <!-- Debug-only menu item, not shown to regular users. -->
+    <string name="debug_show_device_management" translatable="false">[Debug] Show Device Management</string>
+    <!-- Debug-only menu item, not shown to regular users. -->
+    <string name="debug_clear_cloud_local_data" translatable="false">[Debug] Clear Cloud &amp; Local Data</string>
+    <!-- Debug overlay showing frames per second. %1$d = integer FPS value. Not shown to regular users. -->
+    <string name="debug_fps" translatable="false">FPS: %1$d</string>
     <string name="error_folder_selection_unsupported">Your device doesn\'t support folder selection. You can still import files individually.</string>
     <string name="error_no_file_manager">No file manager found. Please install a file manager app.</string>
-    <string name="feedback_email_subject">Feedback: Episteme Reader</string>
+    <!-- Email subject line for user feedback. "Episteme Reader" is the app name — do not translate. -->
+    <string name="feedback_email_subject" translatable="false">Feedback: Episteme Reader</string>
+    <!-- Banner shown after a file is downloaded from an OPDS catalog. %1$s = the downloaded filename. -->
     <string name="banner_downloaded">Downloaded %1$s</string>
+    <!-- Generic compound filter label. %1$s = filter category name; %2$s = filter value (e.g. "Type: PDF"). -->
     <string name="filter_facet">%1$s: %2$s</string>
+    <!-- Shown in the folder sync card\'s "Last Sync" field when the folder has never been scanned. -->
     <string name="never">Never</string>
+    <!-- Folder filter chip label. %1$s = folder display name; %2$d = number of books in that folder. -->
     <string name="folder_filter_count">%1$s: %2$d</string>
 
     <!-- ViewModel Messages: Banners & Errors -->
+    <!-- %1$d = count of streaming books that were removed when a catalog was deleted. -->
     <string name="banner_removed_streaming_books">Removed %1$d streaming books.</string>
+    <!-- %1$s = error reason/message from the system. -->
     <string name="error_import_font">Failed to import font: %1$s</string>
+    <!-- "Text view" is the name of the PDF reflow/text feature in this app. -->
     <string name="banner_text_view_deleted">Text view deleted.</string>
+    <!-- "Google Drive" is a brand name — do not translate. -->
     <string name="error_sync_drive_permission">Sync requires Google Drive permission.</string>
     <string name="error_purchase_general">An error occurred with the purchase.</string>
+    <!-- "Pro" refers to the Episteme Pro product tier. -->
     <string name="banner_upgrade_success">Upgrade successful! Welcome to Pro.</string>
     <string name="error_purchase_verification">Purchase verification failed. Please contact support if you were charged.</string>
     <string name="banner_device_removed">This device was removed from your account.</string>
     <string name="error_verify_device">Could not verify this device. Please check your connection.</string>
     <string name="error_update_devices">Failed to update devices. Please try again.</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="banner_saving_pdf">Saving PDF…</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="banner_pdf_saved">PDF saved successfully.</string>
     <string name="error_open_file_saving">Failed to open file for saving.</string>
+    <!-- %1$s = error message from the system. PDF = file format name — do not translate. -->
     <string name="error_saving_pdf">Error saving PDF: %1$s</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="banner_saving_original_pdf">Saving original PDF…</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="banner_original_pdf_saved">Original PDF saved successfully.</string>
+    <!-- Email/share subject line. %1$s = the name of the file being shared. -->
     <string name="share_subject">Sharing: %1$s</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="share_chooser_title">Share PDF</string>
+    <!-- %1$s = error reason string from the system. -->
     <string name="error_share_failed">Share failed: %1$s</string>
+    <!-- %1$d = the maximum number of folders allowed (currently 3). -->
     <string name="error_folder_limit_reached">Limit reached: Maximum %1$d folders allowed.</string>
     <string name="error_folder_already_synced">This folder is already synced.</string>
+    <!-- %1$s = the display name or path of the folder that was added. -->
     <string name="banner_folder_added">Folder added: %1$s</string>
     <string name="error_access_folder_permissions">Failed to access folder permissions.</string>
     <string name="banner_folder_removed">Folder removed.</string>
@@ -365,6 +469,7 @@
     <string name="banner_folder_sync_complete">Folder Sync: Scan complete.</string>
     <string name="error_sync_failed">Sync failed.</string>
     <string name="error_enable_sync_download">Enable sync to download files.</string>
+    <!-- %1$s = the filename that failed to download. -->
     <string name="error_download_failed">Failed to download %1$s.</string>
     <string name="error_enable_sync_clear_cloud">Enable sync to clear cloud data.</string>
     <string name="error_not_signed_in_clear_cloud">Not signed in, cannot clear cloud data.</string>
@@ -375,7 +480,9 @@
     <string name="error_sign_in_failed">Sign in failed. Please try again.</string>
     <string name="error_no_google_account">Could not find a Google account. This can happen on a fresh install, please try again in a moment.</string>
     <string name="error_sign_in_internet">An error occurred during sign in. Please check your internet connection.</string>
+    <!-- Debug/developer message. -->
     <string name="error_sign_in_device_management">Please sign in to test device management.</string>
+    <!-- "Episteme Pro" is the product tier name — do not translate "Episteme". -->
     <string name="error_sync_pro_feature">Sync is an Episteme Pro feature.</string>
     <string name="error_not_signed_in_sync">Not signed in, cannot sync.</string>
     <string name="banner_cloud_sync_checking">Cloud Sync: Checking for updates…</string>
@@ -384,105 +491,125 @@
     <string name="error_recent_item_not_found">Could not find recent item.</string>
     <string name="error_import_file_failed">Failed to import file.</string>
     <string name="error_file_location_not_found">Could not find file location.</string>
+    <!-- "Text view" is the name of the PDF reflow feature in this app. -->
     <string name="error_load_generated_text_view">Failed to load generated text view.</string>
+    <!-- "Text view" is the name of the PDF reflow feature in this app. -->
     <string name="error_text_view_generation_failed">Text view generation failed.</string>
+    <!-- FB2 is a file format name — do not translate. %1$s = error message from the system. -->
     <string name="error_load_fb2">Failed to load FB2: %1$s</string>
+    <!-- %1$s = error message from the system. -->
     <string name="error_load_file">Failed to load file: %1$s</string>
+    <!-- MOBI is a file format name — do not translate. %1$s = error message from the system. -->
     <string name="error_load_mobi">Failed to load MOBI: %1$s</string>
+    <!-- EPUB is a file format name — do not translate. %1$s = error message from the system. -->
     <string name="error_load_epub">Failed to load EPUB: %1$s</string>
     <string name="banner_file_deleted_from_folder">File deleted from folder. Removed from library.</string>
     <string name="error_shelf_exists">A shelf with that name already exists.</string>
     <string name="banner_deleting_all_devices">Deleting from all devices…</string>
     <string name="banner_deletion_complete">Deletion complete.</string>
     <string name="error_cloud_sync_failed_deleted_locally">Cloud sync failed, deleted locally.</string>
+    <!-- %1$d = number of books removed from the library. -->
     <string name="banner_books_removed_library">%1$d book(s) removed from library.</string>
+    <!-- "Text views" are PDF reflow versions of documents. -->
     <string name="banner_reflow_cache_cleared">Reflow cache &amp; generated text views cleared.</string>
 
     <!-- Common.kt: SearchTopBar & SearchNavigationControls -->
     <string name="search_in_book">Search in book…</string>
-    <string name="content_desc_close_search">Close Search</string>
-    <string name="content_desc_clear_search">Clear Search</string>
-    <string name="content_desc_hide_results">Hide Results</string>
-    <string name="content_desc_show_results">Show Results</string>
-    <string name="content_desc_prev_result">Previous Search Result</string>
-    <string name="content_desc_next_result">Next Search Result</string>
     <string name="search_no_results_simple">No results found.</string>
 
-    <!-- Common.kt: SummarizationPopup -->
-    <string name="generating_summary">Generating summary…</string>
+    <!-- Common.kt: SummarizationPopup — AI feature, not translated. -->
+    <string name="generating_summary" translatable="false">Generating summary…</string>
     <string name="action_stop">Stop</string>
     <string name="action_read_aloud">Read aloud</string>
     <string name="action_copy">Copy</string>
-    <string name="no_summary_generated">No summary could be generated.</string>
+    <string name="no_summary_generated" translatable="false">No summary could be generated.</string>
 
-    <!-- Common.kt: AiDefinitionPopup -->
-    <string name="ai_thinking">Thinking…</string>
+    <!-- Common.kt: AiDefinitionPopup — AI feature, not translated. -->
+    <string name="ai_thinking" translatable="false">Thinking…</string>
     <string name="content_desc_open_dictionary">Open in Dictionary App</string>
-    <string name="ai_no_definition">AI could not provide a definition.</string>
-    <string name="ai_asking_about">Asking AI about \'%1$s\'…</string>
+    <string name="ai_no_definition" translatable="false">AI could not provide a definition.</string>
+    <!-- AI feature string. %1$s = the word or phrase the user selected. -->
+    <string name="ai_asking_about" translatable="false">Asking AI about \'%1$s\'…</string>
 
     <!-- Common.kt: TtsSettingsSheet -->
+    <!-- TTS = Text-to-Speech. -->
     <string name="tts_settings">Text-to-Speech Settings</string>
     <string name="tts_stop_to_change_settings">Please stop playback to change settings.</string>
+    <!-- TTS synthesis mode refers to whether speech is generated on the device or in the cloud. -->
     <string name="tts_synthesis_mode">Synthesis Mode</string>
+    <!-- On-Device TTS mode — speech is generated locally without internet. -->
     <string name="tts_mode_on_device">On-Device</string>
-    <string name="tts_mode_cloud_hq">Cloud (HQ)</string>
+    <!-- Cloud TTS mode — speech is generated remotely for higher quality. Not translated (feature name). -->
+    <string name="tts_mode_cloud_hq" translatable="false">Cloud (HQ)</string>
     <string name="tts_voice_selection">Voice Selection</string>
     <string name="tts_play_sample">Play Sample</string>
 
     <!-- Common.kt: DeviceVoiceSettingsSheet -->
+    <!-- TTS = Text-to-Speech; "On-Device" = locally generated. -->
     <string name="tts_device_voice_settings">On-Device Voice Settings</string>
     <string name="content_desc_close_settings">Close Settings</string>
     <string name="tts_system_default">System Default</string>
+    <!-- "Android" is a brand name — do not translate. -->
     <string name="tts_system_default_desc">Matches your Android system settings</string>
     <string name="content_desc_selected">Selected</string>
     <string name="tts_loading_voices">Loading voices…</string>
     <string name="tts_no_voices">No voices available on this device.</string>
     <string name="tts_specific_voices">Specific Voices</string>
+    <!-- %1$d = total number of TTS voices available on this device. -->
     <string name="tts_available_voices_count">Available Voices (%1$d)</string>
     <string name="tts_no_voices_for_language">No voices found for this language.</string>
+    <!-- %1$s = the variant label provided by the TTS engine (e.g. "Male", "Female", locale variant string). -->
     <string name="tts_voice_variant">Variant: %1$s</string>
+    <!-- Sample sentence spoken aloud to preview a TTS voice. %1$s = voice name from the TTS engine. -->
     <string name="tts_voice_sample_text">This is a sample of %1$s.</string>
 
     <!-- Common.kt: ReaderThemePanel & ThemeBuilderView -->
     <string name="reading_themes">Reading Themes</string>
     <string name="theme_presets">Presets</string>
     <string name="theme_my_themes">My Themes</string>
+    <!-- "+" is a literal plus icon reference in the description. -->
     <string name="theme_no_custom">No custom themes yet. Tap \'+\' to create one.</string>
     <string name="theme_new">New Theme</string>
     <string name="theme_edit">Edit Theme</string>
     <string name="theme_name">Theme Name</string>
+    <!-- Short motivational quote used as preview text in the theme builder. -->
     <string name="theme_preview_quote">So many books, so little time.</string>
-    <string name="theme_preview_author">- Frank Zappa</string>
+    <!-- Attribution for the preview quote. "Frank Zappa" is a proper name — do not translate the name. The leading dash and formatting should be kept. -->
+    <string name="theme_preview_author" translatable="false">- Frank Zappa</string>
+    <!-- Warning shown when the chosen background/text color combination has low contrast. ⚠️ is an emoji — keep it. -->
     <string name="theme_low_contrast_warning">⚠️ Low contrast! This might cause eye strain.</string>
     <string name="theme_page_color">Page Color</string>
     <string name="theme_text_color">Text Color</string>
     <string name="theme_color_live_preview">Live Preview</string>
+    <!-- Short phrase shown in the live color preview area of the theme builder. -->
     <string name="theme_color_preview_text">Reading is dreaming.</string>
-    <string name="theme_color_hex">Hex</string>
+    <!-- "Hex" = hexadecimal color notation (e.g. #FF5733). Technical abbreviation — do not translate. -->
+    <string name="theme_color_hex" translatable="false">Hex</string>
 
-    <!-- Common.kt: RGB Inputs -->
-    <string name="color_r">R</string>
-    <string name="color_g">G</string>
-    <string name="color_b">B</string>
+    <!-- Common.kt: RGB Inputs — R, G, B are universal color-channel abbreviations, do not translate. -->
+    <string name="color_r" translatable="false">R</string>
+    <string name="color_g" translatable="false">G</string>
+    <string name="color_b" translatable="false">B</string>
 
-    <!-- Common.kt: fetchAiDefinition -->
-    <string name="error_text_empty">Text is empty.</string>
-    <string name="error_ai_empty_definition">AI returned an empty definition.</string>
-    <string name="error_could_not_get_definition">Could not get definition.</string>
-    <string name="error_unknown_server">An unknown server error occurred.</string>
-    <string name="error_network_check_connection">Network error. Check connection.</string>
+    <!-- Common.kt: fetchAiDefinition — AI feature errors, not translated. -->
+    <string name="error_text_empty" translatable="false">Text is empty.</string>
+    <string name="error_ai_empty_definition" translatable="false">AI returned an empty definition.</string>
+    <string name="error_could_not_get_definition" translatable="false">Could not get definition.</string>
+    <string name="error_unknown_server" translatable="false">An unknown server error occurred.</string>
+    <string name="error_network_check_connection" translatable="false">Network error. Check connection.</string>
 
-    <!-- Common.kt: fetchRecap -->
-    <string name="error_not_enough_context">Not enough context for a recap.</string>
-    <string name="error_parse_recap">Failed to parse recap.</string>
-    <string name="error_network_recap">Network error during recap generation.</string>
+    <!-- Common.kt: fetchRecap — Recap feature, not translated. -->
+    <string name="error_not_enough_context" translatable="false">Not enough context for a recap.</string>
+    <string name="error_parse_recap" translatable="false">Failed to parse recap.</string>
+    <string name="error_network_recap" translatable="false">Network error during recap generation.</string>
 
     <!-- DictionarySettingsDialog.kt -->
     <string name="dict_lookup_settings">Lookup Settings</string>
     <string name="dict_dictionary_engine">Dictionary Engine</string>
+    <!-- "AI" = Artificial Intelligence. Engine option label. -->
     <string name="dict_smart_ai">Smart (AI)</string>
     <string name="dict_external_app">External App</string>
+    <!-- "AI" = Artificial Intelligence. Describes the Smart AI dictionary engine behavior. -->
     <string name="dict_ai_description">Uses AI for definitions. Will fall back to the external app below if offline or if the selected phrase is too long.</string>
     <string name="dict_external_description">Uses the selected app for dictionary lookups.</string>
     <string name="dict_fallback_app">Fallback App</string>
@@ -494,25 +621,31 @@
     <string name="dict_search_app_description">App used for web searches.</string>
     <string name="dict_none">None</string>
 
-    <!-- EpubReaderAi.kt -->
-    <string name="ai_error_book_content_empty">The book content is empty.</string>
-    <string name="ai_error_parse_summary">Failed to parse summary from server response.</string>
-    <string name="ai_error_fetch_summary">Could not fetch summary.</string>
-    <string name="ai_error_with_code">Error: %1$d. %2$s</string>
-    <string name="ai_error_network_server">Network error. Please check connection and server status.</string>
-    <string name="ai_analyzing_chapter">Analyzing Chapter %1$d…</string>
-    <string name="ai_reading_position">Reading current position…</string>
-    <string name="ai_generating_recap">Generating Recap…</string>
-    <string name="ai_chapter_summary">Chapter Summary</string>
-    <string name="ai_story_recap_beta">Story Recap (Beta)</string>
-    <string name="ai_unlock_summarization">Unlock Chapter Summarization</string>
-    <string name="ai_unlock_summarization_desc">Get concise summaries of any chapter with Episteme Pro. Upgrade to start using this feature.</string>
+    <!-- EpubReaderAi.kt — AI feature strings, not translated. -->
+    <string name="ai_error_book_content_empty" translatable="false">The book content is empty.</string>
+    <string name="ai_error_parse_summary" translatable="false">Failed to parse summary from server response.</string>
+    <string name="ai_error_fetch_summary" translatable="false">Could not fetch summary.</string>
+    <!-- %1$d = HTTP or server error code; %2$s = human-readable error message from the server. -->
+    <string name="ai_error_with_code" translatable="false">Error: %1$d. %2$s</string>
+    <string name="ai_error_network_server" translatable="false">Network error. Please check connection and server status.</string>
+    <!-- %1$d = chapter number being analyzed. -->
+    <string name="ai_analyzing_chapter" translatable="false">Analyzing Chapter %1$d…</string>
+    <string name="ai_reading_position" translatable="false">Reading current position…</string>
+    <string name="ai_generating_recap" translatable="false">Generating Recap…</string>
+    <string name="ai_chapter_summary" translatable="false">Chapter Summary</string>
+    <!-- "(Beta)" indicates this feature is in beta — keep the label consistent. -->
+    <string name="ai_story_recap_beta" translatable="false">Story Recap (Beta)</string>
+    <string name="ai_unlock_summarization" translatable="false">Unlock Chapter Summarization</string>
+    <!-- "Episteme Pro" is the product tier name. -->
+    <string name="ai_unlock_summarization_desc" translatable="false">Get concise summaries of any chapter with Episteme Pro. Upgrade to start using this feature.</string>
     <string name="action_learn_more">Learn More</string>
-    <string name="ai_unlock_smart_dict">Unlock Smart Dictionary</string>
-    <string name="ai_unlock_smart_dict_desc">Defining entire phrases and paragraphs up to 2000 characters is a Pro feature. Upgrade to get instant definitions for any selected text.</string>
+    <string name="ai_unlock_smart_dict" translatable="false">Unlock Smart Dictionary</string>
+    <!-- "Pro" refers to the Episteme Pro product tier. -->
+    <string name="ai_unlock_smart_dict_desc" translatable="false">Defining entire phrases and paragraphs up to 2000 characters is a Pro feature. Upgrade to get instant definitions for any selected text.</string>
 
     <!-- EpubReaderAnnotations.kt -->
     <string name="content_desc_bookmark_icon">Bookmark</string>
+    <!-- Accessibility label for the currently selected color slot in the annotation palette. -->
     <string name="content_desc_selected_slot">Selected Slot</string>
     <string name="dialog_customize_palette">Customize Palette</string>
     <string name="palette_tap_slot_to_edit">Tap a slot to edit:</string>
@@ -528,10 +661,15 @@
     <string name="tooltip_theme">Theme</string>
     <string name="tooltip_theme_desc">Theme Settings</string>
     <string name="content_desc_more_options">More Options</string>
+    <!-- PDF = file format name — do not translate. -->
     <string name="menu_view_original_pdf">View Original PDF</string>
+    <!-- "Text View" is the name of the PDF reflow feature in this app — keep consistent. -->
     <string name="menu_delete_text_view">Delete Text View</string>
+    <!-- Menu item to switch reading mode. The colon-separated format "Reading Mode: Vertical" is intentional — do not omit the colon. -->
     <string name="menu_reading_mode_vertical">Reading Mode: Vertical</string>
+    <!-- Menu item to switch reading mode. The colon-separated format "Reading Mode: Paginated" is intentional — do not omit the colon. -->
     <string name="menu_reading_mode_paginated">Reading Mode: Paginated</string>
+    <!-- Accessibility label for a menu item that is currently active/checked. -->
     <string name="content_desc_enabled">Enabled</string>
     <string name="menu_remove_bookmark">Remove bookmark</string>
     <string name="menu_bookmark_this_page">Bookmark this page</string>
@@ -542,35 +680,51 @@
     <string name="menu_keep_screen_on">Keep Screen On</string>
     <string name="menu_visual_options">Visual Options</string>
     <string name="menu_auto_scroll">Auto Scroll</string>
+    <!-- TTS = Text-to-Speech. -->
     <string name="menu_tts_voice_settings">TTS Voice Settings</string>
+    <!-- TTS = Text-to-Speech. Debug-only menu item. -->
     <string name="menu_tts_settings_debug">TTS Settings (Debug)</string>
     <string name="content_desc_navigate_slider">Navigate with slider</string>
     <string name="content_desc_chapters_menu">Chapters Menu</string>
     <string name="content_desc_text_formatting">Text Formatting</string>
+    <!-- AI chapter summarization feature menu item. -->
     <string name="menu_chapter_summarization">Chapter Summarization</string>
-    <string name="menu_recap_beta">Recap (Beta)</string>
+    <!-- Recap is an AI feature. "(Beta)" indicates it is in beta — keep consistent. Not translated. -->
+    <string name="menu_recap_beta" translatable="false">Recap (Beta)</string>
+    <!-- TTS = Text-to-Speech. Accessibility label. -->
     <string name="content_desc_stop_tts">Stop TTS</string>
+    <!-- TTS = Text-to-Speech. Accessibility label. -->
     <string name="content_desc_start_tts">Start TTS</string>
+    <!-- TTS = Text-to-Speech. Accessibility label. -->
     <string name="content_desc_pause_tts">Pause TTS</string>
+    <!-- TTS = Text-to-Speech. Accessibility label. -->
     <string name="content_desc_resume_tts">Resume TTS</string>
     <string name="content_desc_exit_slider">Exit slider navigation</string>
     <string name="content_desc_start_page_thumbnail">Start page thumbnail</string>
     <string name="content_desc_expand">Expand</string>
     <string name="content_desc_collapse">Collapse</string>
-    <string name="content_desc_pause_playback">Pause</string>
     <string name="content_desc_start_playback">Play</string>
+    <!-- "Local Speed" = auto-scroll speed saved for the current file only. -->
     <string name="auto_scroll_local_speed">Local Speed</string>
+    <!-- "Global Speed" = auto-scroll speed that applies to all files. -->
     <string name="auto_scroll_global_speed">Global Speed</string>
+    <!-- Accessibility label for the text-selection mode toggle in the PDF reader. -->
     <string name="content_desc_select_mode">Select Mode</string>
     <string name="auto_scroll_applies_all_files">Applies to all files</string>
     <string name="auto_scroll_saved_for_file">Saved for this file only</string>
+    <!-- Musician Mode locks the reading position to allow hands-free page-reading while playing an instrument. -->
     <string name="content_desc_disable_musician_mode">Disable Musician Mode</string>
+    <!-- Musician Mode locks the reading position to allow hands-free page-reading while playing an instrument. -->
     <string name="content_desc_enable_musician_mode">Enable Musician Mode</string>
+    <!-- Accessibility label to swap the positions of playback control buttons (e.g., TTS/auto-scroll controls). -->
     <string name="content_desc_swap_controls">Swap Controls</string>
+    <!-- Min endpoint label for the auto-scroll speed slider. -->
     <string name="label_min">Min</string>
+    <!-- Max endpoint label for the auto-scroll speed slider. -->
     <string name="label_max">Max</string>
     <string name="content_desc_slower">Slower</string>
     <string name="content_desc_faster">Faster</string>
+    <!-- Shown in the PDF reader header. %1$d = current page number; %2$d = total page count. -->
     <string name="page_of_pages">Page %1$d of %2$d</string>
 
     <!-- EpubReaderDrawer.kt -->
@@ -578,9 +732,7 @@
     <string name="tab_bookmarks">Bookmarks</string>
     <string name="tab_highlights">Highlights</string>
     <string name="no_bookmarks_yet">You haven\'t added any bookmarks yet.</string>
-    <string name="bookmark_page_of">Page %1$d of %2$d</string>
     <string name="content_desc_more_options_bookmark">More options for bookmark</string>
-    <string name="menu_rename">Rename</string>
     <string name="dialog_rename_bookmark">Rename Bookmark</string>
     <string name="label_new_name">New Name</string>
     <string name="dialog_delete_bookmark">Delete Bookmark?</string>
@@ -592,7 +744,9 @@
     <string name="dialog_delete_highlight_desc">Are you sure you want to permanently delete this highlight?</string>
 
     <!-- EpubReaderScreen.kt -->
+    <!-- PDF = file format name — do not translate. -->
     <string name="banner_original_pdf_not_found">Original PDF not found.</string>
+    <!-- Error state shown in the reader. %1$s = the file path that could not be found. -->
     <string name="error_book_content_not_found">Error: Book content not found. Path: %1$s</string>
     <string name="toast_select_dictionary_first">Please select a dictionary app first.</string>
     <string name="toast_select_translate_first">Please select a translate app first.</string>
@@ -602,7 +756,9 @@
     <string name="dialog_permission_required">Permission Required</string>
     <string name="dialog_permission_notification_desc">To show playback controls while the app is in the background, please grant the notification permission.</string>
     <string name="action_continue">Continue</string>
+    <!-- "Paginated Mode" is a reading mode name — keep consistent. -->
     <string name="dialog_justified_text_limitation">Justified Text Limitation</string>
+    <!-- "Paginated Mode" is a reading mode name — keep consistent. -->
     <string name="dialog_justified_text_limitation_desc">Using Justified alignment in Paginated Mode may cause text selection and highlights to be inaccurate due to layout limitations.</string>
     <string name="action_i_understand">I Understand</string>
     <string name="navigating_to_chapter">Navigating to chapter…</string>
@@ -611,15 +767,19 @@
     <string name="banner_wait_for_load">Wait for book to load fully.</string>
     <string name="release_for_previous_chapter">Release for Previous Chapter</string>
     <string name="release_for_next_chapter">Release for Next Chapter</string>
+    <!-- Shown while the user is pulling to navigate to another chapter. %1$d = current pull percentage (0–100). %% is a literal percent sign. -->
     <string name="pull_further_percent">Pull further… (%1$d%%)</string>
     <string name="chapter">Chapter</string>
     <string name="error_could_not_get_chapter_content">Could not get chapter content.</string>
     <string name="error_could_not_determine_chapter">Could not determine current chapter.</string>
     <string name="error_webview_not_available">WebView not available.</string>
+    <!-- Shown in the chapter navigation overlay. %1$d = current page within the chapter; %2$d = total pages in the chapter. -->
     <string name="page_number_of_total">Page %1$d/%2$d</string>
 
     <!-- EpubReaderSettings.kt -->
+    <!-- "Local Format" = text formatting settings saved for the current book only. -->
     <string name="format_local">Local Format</string>
+    <!-- "Global Format" = text formatting settings that apply to all books. -->
     <string name="format_global">Global Format</string>
     <string name="action_reset">Reset</string>
     <string name="label_size">Size</string>
@@ -630,33 +790,246 @@
     <string name="button_import_from_files">Import from Files</string>
     <string name="no_imported_fonts_yet">No imported fonts yet.</string>
     <string name="visual_options_title">Visual Options</string>
+    <!-- "Status Bar" and "Navigation Bar" are standard Android UI terms — keep consistent with your OS locale if applicable. -->
     <string name="visual_options_system_ui">System UI (Status &amp; Navigation Bars)</string>
     <string name="visual_options_system_ui_desc">Control the visibility of the device\'s system bars.</string>
     <string name="visual_options_progress_bar">Progress Bar</string>
     <string name="visual_options_progress_bar_desc">The reading progress and chapter indicator at the bottom of the screen.</string>
+    <!-- "Seamless Chapter Transition" is a reading feature name. -->
     <string name="visual_options_seamless_chapter">Seamless Chapter Transition</string>
     <string name="visual_options_seamless_chapter_desc">Instantly load the next/previous chapter when scrolling past the end, without the pull-to-refresh animation.</string>
     <string name="visual_options_edge_padding">Remove Edge Padding</string>
     <string name="visual_options_edge_padding_desc">Removes the horizontal gap on the left and right edges.</string>
 
     <!-- ExternalDictionaryHelper.kt -->
+    <!-- Label for the "Search" app category in the dictionary settings. -->
     <string name="dict_app_label_search">Search</string>
     <string name="error_opening_dictionary">Error opening dictionary</string>
     <string name="error_opening_translate">Error opening translate app</string>
     <string name="error_opening_search">Error opening search app</string>
 
     <!-- About Section -->
-    <string name="about_app_name">Episteme</string>
+    <!-- "Episteme" is the app brand name — do not translate. -->
+    <string name="about_app_name" translatable="false">Episteme</string>
+    <!-- OSS = Open Source Software. -->
     <string name="about_oss_version">Open Source Version</string>
     <string name="about_play_version">Playstore Version</string>
+    <!-- %1$s = version string (e.g. "1.0.41"). -->
     <string name="about_version_name">Version %1$s</string>
+    <!-- %1$s = build code string. -->
     <string name="about_build_code">Build %1$s</string>
-    <string name="about_github">GitHub</string>
+    <!-- "GitHub" is a brand name — do not translate. -->
+    <string name="about_github" translatable="false">GitHub</string>
+    <!-- "GitHub" is a brand name — do not translate. -->
     <string name="about_github_desc">Browse source code, star, fork, and report issues.</string>
-    <string name="about_privacy">Privacy Policy</string>
     <string name="about_privacy_desc">How we handle your data.</string>
-    <string name="about_terms">Terms of Service</string>
     <string name="about_terms_desc">Usage terms and conditions.</string>
     <string name="about_licenses_desc">Open source libraries used.</string>
+    <!-- %1$d = number of books being imported. -->
     <string name="banner_importing_multiple">Importing %1$d books… They will appear in your Library shortly.</string>
+
+    <!-- General / Dialogs -->
+    <string name="dialog_external_link_title">External Link</string>
+    <!-- %1$s = the full URL of the external link the user tapped. -->
+    <string name="dialog_external_link_desc">You clicked on an external link:\n\n%1$s\n\nWhat would you like to do?</string>
+    <string name="action_open">Open</string>
+    <string name="error_no_browser">No browser found to open the link.</string>
+
+    <!-- Annotations & Notes -->
+    <string name="action_save_note">Save Note</string>
+    <string name="placeholder_add_note">Add a note…</string>
+    <!-- Short label for the dictionary action in a text-selection popup. -->
+    <string name="label_dict">Dict</string>
+    <!-- Short label for the speak/TTS action in a text-selection popup. -->
+    <string name="label_speak">Speak</string>
+    <!-- Short label for the note action in a text-selection popup. -->
+    <string name="label_note">Note</string>
+    <!-- Short label for the edit action in a text-selection popup. -->
+    <string name="label_edit">Edit</string>
+
+    <!-- Reader Settings & Formatting -->
+    <!-- All-caps section header in the reader settings sheet. -->
+    <string name="section_font_alignment">FONT &amp; ALIGNMENT</string>
+    <!-- All-caps section header in the reader settings sheet. -->
+    <string name="section_layout_spacing">LAYOUT &amp; SPACING</string>
+    <string name="label_font_size">Font Size</string>
+    <string name="label_line_height">Line Height</string>
+    <string name="label_paragraph_gap">Paragraph Gap</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. -->
+    <string name="label_aa_preview" translatable="false">Aa</string>
+
+    <!-- TTS & AutoScroll Controls -->
+    <!-- TTS = Text-to-Speech. -->
+    <string name="tts_voice_adjustments">Voice Adjustments</string>
+    <!-- Speed multiplier label. %1$s = speed float value (e.g. "1.5"); the trailing "x" is a speed multiplier suffix. -->
+    <string name="tts_speed_label">Speed (%1$sx)</string>
+    <!-- Pitch multiplier label. %1$s = pitch float value (e.g. "1.0"); the trailing "x" is a multiplier suffix. -->
+    <string name="tts_pitch_label">Pitch (%1$sx)</string>
+    <string name="tts_sample_text">This is how your current voice settings sound.</string>
+    <string name="tts_pause_book">Pause Book</string>
+    <string name="tts_resume_book">Resume Book</string>
+    <!-- Opens the Android system TTS/voice engine settings. "System" refers to the Android OS settings. -->
+    <string name="tts_system_settings">System Voice / Engine Settings</string>
+
+    <!-- Auto Scroll -->
+    <!-- "Global Speed" = speed that applies to all files. -->
+    <string name="auto_scroll_global_label">Global Speed</string>
+    <!-- "Local Speed" = speed saved for the current file only. -->
+    <string name="auto_scroll_local_label">Local Speed</string>
+    <string name="auto_scroll_desc_global">Applies to all files</string>
+    <string name="auto_scroll_desc_local">Saved for this file only</string>
+    <string name="action_scroll_to_top">Scroll to Top</string>
+
+    <!-- Customize Toolbar -->
+    <string name="title_customize_toolbar">Customize Toolbar</string>
+    <string name="desc_customize_toolbar">Select the tools you want to keep visible. Unchecking a tool hides it from the UI to give you a distraction-free reading space.</string>
+
+    <!-- Navigation & Drawer -->
+    <string name="tab_annotations">Annotations</string>
+    <!-- Filter option label to show all annotations. -->
+    <string name="filter_all">All</string>
+    <!-- Filter option label to show only annotations that have attached notes. -->
+    <string name="filter_with_notes">With Notes</string>
+    <string name="menu_add_note">Add Note</string>
+    <string name="menu_edit_note">Edit Note</string>
+
+    <!-- Page Info -->
+    <!-- Compact page indicator. %1$d = current page; %2$d = total pages. -->
+    <string name="page_format">%1$d / %2$d</string>
+    <!-- Full page indicator shown in the reader. %1$d = current page; %2$d = total pages. -->
+    <string name="page_of_format">Page %1$d of %2$d</string>
+
+    <!-- AnnotationDock -->
+    <string name="content_desc_close_edit_mode">Close Edit Mode</string>
+    <!-- Toggle that shows or hides the annotation dock. -->
+    <string name="content_desc_toggle_visibility">Toggle Visibility</string>
+    <!-- Stylus Only Mode restricts drawing input to a stylus, ignoring finger touches. -->
+    <string name="content_desc_stylus_only_mode">Stylus Only Mode</string>
+    <string name="content_desc_pen">Pen</string>
+    <string name="content_desc_highlighter">Highlighter</string>
+    <string name="content_desc_text">Text</string>
+    <string name="content_desc_eraser">Eraser</string>
+    <string name="content_desc_undo">Undo</string>
+    <string name="content_desc_redo">Redo</string>
+    <string name="content_desc_show_dock">Show Dock</string>
+
+    <!-- PdfPageComposable -->
+    <!-- OCR = Optical Character Recognition. %1$s = error reason string. -->
+    <string name="error_ocr_selection">OCR selection error: %1$s</string>
+    <!-- %1$s = error reason string from the selection engine. -->
+    <string name="error_selection">Selection error: %1$s</string>
+    <!-- %1$s = error reason string from the rendering engine. -->
+    <string name="error_processing_page">Error processing page: %1$s</string>
+    <!-- %1$d = the page number (1-indexed) that could not be rendered. -->
+    <string name="error_unable_to_display_page">Unable to display page %1$d.</string>
+
+    <!-- PdfViewerScreen & General Reader -->
+    <string name="error_open_print_settings">Could not open print settings</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="loading_pdf">Loading PDF…</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="error_loading_pdf">Error loading PDF</string>
+    <string name="loading_page">Loading page…</string>
+    <!-- PDF = file format name — do not translate. "Viewer" = the screen/component name. -->
+    <string name="pdf_viewer">PDF Viewer</string>
+    <!-- "Pen Playground" is the name of a developer/debug canvas for testing the annotation pen tool. -->
+    <string name="pen_playground">Pen Playground</string>
+    <!-- SVG = Scalable Vector Graphics (file format name — do not translate). -->
+    <string name="import_svg">Import SVG</string>
+    <!-- %1$d = number of SVG stroke paths that were successfully imported. -->
+    <string name="msg_imported_svg_strokes">Imported %1$d SVG strokes!</string>
+    <!-- SVG = Scalable Vector Graphics (file format name — do not translate). -->
+    <string name="error_import_svg_failed">Failed to import SVG or empty.</string>
+    <!-- OCR = Optical Character Recognition. -->
+    <string name="menu_ocr_language">OCR Language</string>
+    <string name="menu_insert_blank_page">Insert Blank Page</string>
+    <string name="menu_delete_page">Delete Page</string>
+    <!-- Progress indicator while generating a text/reflow view. %1$d = percentage complete (0–100). %% is a literal percent sign. -->
+    <string name="generating_reflow_progress">Generating… %1$d%%</string>
+    <!-- "Text View" is the name of the PDF reflow feature — keep consistent. -->
+    <string name="action_open_text_view">Open Text View</string>
+    <!-- "Text View" is the name of the PDF reflow feature — keep consistent. -->
+    <string name="action_generate_text_view">Generate Text View</string>
+    <string name="action_share">Share</string>
+    <string name="action_save_copy_to_device">Save copy to device</string>
+    <string name="action_print">Print</string>
+    <!-- "Text View" is the name of the PDF reflow feature — keep consistent. -->
+    <string name="generating_text_view">Generating Text View…</string>
+    <!-- %1$d = indexing completion percentage (0–100). -->
+    <string name="msg_indexing_pages_progress">Indexing pages… %1$d%% done. Search results will update automatically.</string>
+    <!-- %1$d = number of pages that contain at least one search result. The "+" indicates "or more". -->
+    <string name="msg_results_found_pages">Results found on %1$d+ pages</string>
+    <!-- Search position indicator. %1$d = current result index; %2$d = total result count. -->
+    <string name="msg_search_result_index">Result %1$d / %2$d</string>
+    <!-- %1$d = number of pages containing results. The "+" indicates "or more". -->
+    <string name="msg_search_pages_count">%1$d+ Pages</string>
+    <!-- Overflow menu item in the PDF reader. %1$d = the current page number. -->
+    <string name="action_summarize_page">Summarize Page (Page %1$d)</string>
+    <!-- OCR = Optical Character Recognition. %1$s = the language/locale name being downloaded (e.g. "Chinese (Simplified)"). -->
+    <string name="msg_downloading_language_pack">Downloading %1$s language pack…</string>
+    <!-- OCR = Optical Character Recognition. -->
+    <string name="title_select_ocr_language">Select OCR Language</string>
+    <!-- OCR = Optical Character Recognition. -->
+    <string name="desc_select_ocr_language">Choose the primary language/script of this document for better text recognition results.</string>
+    <!-- OCR = Optical Character Recognition. "More Options" is a UI menu name — keep consistent. -->
+    <string name="desc_ocr_language_change_later">You can change this later in More Options &gt; OCR Language.</string>
+    <!-- OCR = Optical Character Recognition. -->
+    <string name="title_reindex_document">Re-index Document?</string>
+    <!-- OCR = Optical Character Recognition. %1$s = the name of the new OCR script/language selected by the user. -->
+    <string name="desc_reindex_document_warning">You are changing the OCR script to %1$s.\n\nTo ensure search accuracy, we need to clear the existing index and re-scan pages that require OCR using this new language.\n\nThis will happen in the background.</string>
+    <!-- OCR = Optical Character Recognition. Button to confirm re-indexing. -->
+    <string name="action_reindex">Re-index</string>
+    <string name="title_password_protected">Password Protected</string>
+    <string name="desc_password_protected">This document is encrypted. Please enter the password to view it.</string>
+    <string name="label_password">Password</string>
+    <string name="error_incorrect_password">Incorrect password</string>
+    <string name="content_desc_hide_password">Hide password</string>
+    <string name="content_desc_show_password">Show password</string>
+    <!-- Warning dialog shown before navigating to a URL from within a PDF. %1$s = the full destination URL. -->
+    <string name="desc_external_link_warning">You are about to navigate to:\n%1$s</string>
+    <string name="action_visit">Visit</string>
+    <string name="title_save_to_device">Save to Device</string>
+    <string name="desc_choose_format_save">Choose format to save:</string>
+    <string name="action_with_annotations">With Annotations</string>
+    <string name="action_original">Original</string>
+    <string name="desc_choose_format_share">Choose format to share:</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="msg_preparing_pdf">Preparing PDF…</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="title_add_pdf_to_tab">Add PDF to Tab</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="msg_no_other_pdfs_found">No other PDFs found in your library.</string>
+    <!-- PDF = file format name — do not translate. -->
+    <string name="msg_pdf_empty_or_error">PDF is empty or could not be displayed.</string>
+    <!-- %1$d = the page index (1-indexed) where the blank page was inserted. -->
+    <string name="msg_page_added_at">Page added at %1$d</string>
+    <string name="msg_page_deleted">Page deleted</string>
+    <string name="msg_extra_page_removed">Extra page removed</string>
+    <string name="msg_chapters_not_available">Chapters are not available for this book.</string>
+    <!-- Default name for a new highlighted section when no text label is provided. -->
+    <string name="msg_highlighted_section_default">Highlighted section</string>
+
+    <!-- ToolSettingsPopup -->
+    <!-- Toggle in the PDF annotation tools to snap drawn lines to a straight angle. -->
+    <string name="label_straight_line">Straight Line</string>
+    <!-- Color picker tab/slider label — "Spectrum" = full color spectrum picker. -->
+    <string name="label_spectrum">Spectrum</string>
+    <string name="action_done">Done</string>
+    <string name="color_red">Red</string>
+    <string name="color_green">Green</string>
+    <string name="color_blue">Blue</string>
+
+    <!-- TextAnnotationDock -->
+    <!-- Default system font option in the annotation font picker. -->
+    <string name="font_default_system">Default System Font</string>
+    <string name="action_import">Import</string>
+    <string name="msg_no_fonts_imported">No fonts imported</string>
+    <string name="label_font_color">Font color</string>
+    <!-- Label for the highlight color picker in text annotations. -->
+    <string name="label_highlight_color">Highlight</string>
+
+    <!-- UniversalDocument -->
+    <string name="msg_page_unavailable">Page Unavailable</string>
 </resources>
diff --git a/app/src/releaseOffline/AndroidManifest.xml b/app/src/releaseOffline/AndroidManifest.xml
new file mode 100644
index 0000000..8e52e22
--- /dev/null
+++ b/app/src/releaseOffline/AndroidManifest.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- This instruction strips the internet permission specifically for the releaseOffline build type -->
+    <uses-permission android:name="android.permission.INTERNET" tools:node="remove" />
+
+</manifest>
\ No newline at end of file