diff --git a/ios/LibNovel/LibNovel/Services/AudioPlayerService.swift b/ios/LibNovel/LibNovel/Services/AudioPlayerService.swift
index bd7c7bd..e1c92d0 100644
--- a/ios/LibNovel/LibNovel/Services/AudioPlayerService.swift
+++ b/ios/LibNovel/LibNovel/Services/AudioPlayerService.swift
@@ -47,6 +47,20 @@ final class AudioPlayerService: ObservableObject {
         default: return true
         }
     }
+    
+    /// Absolute previous chapter number (current - 1), or nil if at first chapter
+    var absolutePrevChapter: Int? {
+        guard chapter > 1 else { return nil }
+        return chapter - 1
+    }
+    
+    /// Absolute next chapter number (current + 1), or nil if at last chapter
+    var absoluteNextChapter: Int? {
+        guard !chapters.isEmpty else { return nil }
+        let maxChapter = chapters.map(\.number).max() ?? chapter
+        guard chapter < maxChapter else { return nil }
+        return chapter + 1
+    }
 
     // MARK: - Private
 
diff --git a/ios/LibNovel/LibNovel/Views/Player/PlayerViews.swift b/ios/LibNovel/LibNovel/Views/Player/PlayerViews.swift
index e09501f..3458f14 100644
--- a/ios/LibNovel/LibNovel/Views/Player/PlayerViews.swift
+++ b/ios/LibNovel/LibNovel/Views/Player/PlayerViews.swift
@@ -77,7 +77,7 @@ struct MiniPlayerView: View {
                     // Previous chapter button
                     if audioPlayer.status == .ready {
                         Button { 
-                            if let prev = audioPlayer.prevChapter {
+                            if let prev = audioPlayer.absolutePrevChapter {
                                 NotificationCenter.default.post(
                                     name: .skipToPrevChapter,
                                     object: nil,
@@ -92,8 +92,8 @@ struct MiniPlayerView: View {
                                 .contentShape(Rectangle())
                         }
                         .buttonStyle(.plain)
-                        .disabled(audioPlayer.prevChapter == nil)
-                        .opacity(audioPlayer.prevChapter == nil ? 0.4 : 1.0)
+                        .disabled(audioPlayer.absolutePrevChapter == nil)
+                        .opacity(audioPlayer.absolutePrevChapter == nil ? 0.4 : 1.0)
                     }
                     
                     // Status indicator or play/pause control
@@ -126,7 +126,7 @@ struct MiniPlayerView: View {
                     // Next chapter button
                     if audioPlayer.status == .ready {
                         Button { 
-                            if let next = audioPlayer.nextChapter {
+                            if let next = audioPlayer.absoluteNextChapter {
                                 NotificationCenter.default.post(
                                     name: .skipToNextChapter,
                                     object: nil,
@@ -158,8 +158,8 @@ struct MiniPlayerView: View {
                             .contentShape(Rectangle())
                         }
                         .buttonStyle(.plain)
-                        .disabled(audioPlayer.nextChapter == nil)
-                        .opacity(audioPlayer.nextChapter == nil ? 0.4 : 1.0)
+                        .disabled(audioPlayer.absoluteNextChapter == nil)
+                        .opacity(audioPlayer.absoluteNextChapter == nil ? 0.4 : 1.0)
                     }
                 }
             }
@@ -456,7 +456,7 @@ struct FullPlayerView: View {
                     
                     // ← previous chapter
                     Button {
-                        if let prev = audioPlayer.prevChapter {
+                        if let prev = audioPlayer.absolutePrevChapter {
                             onDismiss()
                             NotificationCenter.default.post(
                                 name: .skipToPrevChapter,
@@ -471,8 +471,8 @@ struct FullPlayerView: View {
                             .frame(maxWidth: .infinity)
                     }
                     .buttonStyle(.plain)
-                    .disabled(audioPlayer.prevChapter == nil)
-                    .opacity(audioPlayer.prevChapter == nil ? 0.5 : 1.0)
+                    .disabled(audioPlayer.absolutePrevChapter == nil)
+                    .opacity(audioPlayer.absolutePrevChapter == nil ? 0.5 : 1.0)
 
                     // play / pause
                     Button { audioPlayer.togglePlayPause() } label: {
@@ -495,7 +495,7 @@ struct FullPlayerView: View {
 
                     // → next chapter
                     Button {
-                        if let next = audioPlayer.nextChapter {
+                        if let next = audioPlayer.absoluteNextChapter {
                             onDismiss()
                             NotificationCenter.default.post(
                                 name: .skipToNextChapter,
@@ -527,8 +527,8 @@ struct FullPlayerView: View {
                         .frame(maxWidth: .infinity)
                     }
                     .buttonStyle(.plain)
-                    .disabled(audioPlayer.nextChapter == nil)
-                    .opacity(audioPlayer.nextChapter == nil ? 0.5 : 1.0)
+                    .disabled(audioPlayer.absoluteNextChapter == nil)
+                    .opacity(audioPlayer.absoluteNextChapter == nil ? 0.5 : 1.0)
                     
                     // → skip forward 15s
                     Button { audioPlayer.skip(by: 15) } label: {