diff --git a/lib/metadata/file_provider.dart b/lib/metadata/file_provider.dart
new file mode 100644
index 0000000..d184457
--- /dev/null
+++ b/lib/metadata/file_provider.dart
@@ -0,0 +1,28 @@
+// lib/metadata/file_provider.dart
+import 'dart:io';
+
+abstract class FileProvider {
+  /// 获取文件，如果是远程文件则先下载到本地缓存
+  Future<File?> getFile(String url);
+}
+
+class LocalFileProvider implements FileProvider {
+  @override
+  Future<File?> getFile(String url) async {
+    final file = File(url);
+    if (await file.exists()) {
+      return file;
+    }
+    return null;
+  }
+}
+
+class WebDAVFileProvider implements FileProvider {
+  @override
+  Future<File?> getFile(String url) async {
+    // 🔴 第一阶段：先不实现下载，返回 null
+    // 这样 WebDAV 文件会 fallback 到文件名
+    // 等核心播放逻辑稳定后，再实现真正的下载缓存
+    return null;
+  }
+}
diff --git a/lib/metadata/metadata_cache.dart b/lib/metadata/metadata_cache.dart
index 80a7dd0..1103bae 100644
--- a/lib/metadata/metadata_cache.dart
+++ b/lib/metadata/metadata_cache.dart
@@ -1,35 +1,26 @@
 // lib/metadata/metadata_cache.dart
 import 'metadata_model.dart';
 
-/// 本地缓存接口（先用内存缓存，后续升级为 SQLite）
 class MetadataCache {
-  // 内存缓存：Map<fileId, FinalMetadata>
   final Map<String, FinalMetadata> _cache = {};
 
-  /// 获取缓存
   Future<FinalMetadata?> get(String fileId) async {
     return _cache[fileId];
   }
 
-  /// 存入缓存
   Future<void> put(String fileId, FinalMetadata metadata) async {
     _cache[fileId] = metadata;
   }
 
-  /// 更新缓存（同 put）
   Future<void> update(String fileId, FinalMetadata metadata) async {
     _cache[fileId] = metadata;
   }
 
-  /// 根据 artist 获取历史记录（用于证据收集）
-  /// 实际项目中需要从数据库查询，目前返回空列表
   Future<List<Map<String, dynamic>>> getHistory(String artist,
       {int limit = 10}) async {
-    // TODO: 从 SQLite 查询
     return [];
   }
 
-  /// 清空缓存
   Future<void> clear() async {
     _cache.clear();
   }
diff --git a/lib/metadata/metadata_model.dart b/lib/metadata/metadata_model.dart
index fd88358..6a192f8 100644
--- a/lib/metadata/metadata_model.dart
+++ b/lib/metadata/metadata_model.dart
@@ -1,71 +1,74 @@
 // lib/metadata/metadata_model.dart
 import 'dart:typed_data';
 
-/// 从音频文件读取的原始元数据（未经任何处理）
+/// 从音频文件读取的原始元数据
 class RawMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final List<String> genres; // ⬅️ 改为 List<String>
+  final List<String> performers; // ⬅️ 新增
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
 
   const RawMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
-    this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
   });
 
-  /// 判断是否为空（没有任何有效信息）
   bool get isEmpty =>
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
-      genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
 
-/// 经过标准化处理后的元数据
+/// 标准化后的元数据
 class NormalizedMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final List<String> genres;
+  final List<String> performers;
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
 
   const NormalizedMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
-    this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
   });
 
@@ -73,54 +76,43 @@ class NormalizedMetadata {
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
-      genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
 
-/// 带置信度的候选元数据
-class CandidateMetadata {
-  final NormalizedMetadata metadata;
-  final double confidence; // 0.0 ~ 1.0
-  final Map<String, double> evidence; // 证据来源权重
-
-  const CandidateMetadata({
-    required this.metadata,
-    required this.confidence,
-    this.evidence = const {},
-  });
-}
-
 /// 最终确认的元数据
 class FinalMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final String genre; // ⬅️ 简化为单个流派（取第一个）
+  final List<String> genres; // ⬅️ 保留完整列表
+  final List<String> performers;
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
-  final String source; // 'file_tag', 'filename', 'cache', 'user_corrected'
+  final String source;
 
   const FinalMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
     this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
     this.source = 'unknown',
   });
@@ -129,13 +121,23 @@ class FinalMetadata {
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
       genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
+
+/// 候选元数据
+class CandidateMetadata {
+  final NormalizedMetadata metadata;
+  final double confidence;
+  final Map<String, double> evidence;
+
+  const CandidateMetadata({
+    required this.metadata,
+    required this.confidence,
+    this.evidence = const {},
+  });
+}
diff --git a/lib/metadata/metadata_normalizer.dart b/lib/metadata/metadata_normalizer.dart
index 0e1a02d..0b6694b 100644
--- a/lib/metadata/metadata_normalizer.dart
+++ b/lib/metadata/metadata_normalizer.dart
@@ -2,39 +2,43 @@
 import 'metadata_model.dart';
 
 class MetadataNormalizer {
-  /// 标准化原始数据（清洗空格、推断、fallback）
   NormalizedMetadata normalize(RawMetadata raw,
       {String fileName = '', String filePath = ''}) {
     // 1. 修剪空格
     final title = raw.title.trim();
     final artist = raw.artist.trim();
     final album = raw.album.trim();
-    final albumArtist = raw.albumArtist.trim();
 
-    // 2. 如果 title 为空，尝试从文件名推断
+    // 2. 如果 title 为空，从文件名推断
     final finalTitle =
         title.isNotEmpty ? title : _inferTitleFromFileName(fileName);
 
-    // 3. 如果 artist 为空，尝试从路径推断或使用默认值
+    // 3. 如果 artist 为空，从路径推断或使用默认值
     final finalArtist =
         artist.isNotEmpty ? artist : _inferArtistFromPath(filePath);
 
+    // 4. 如果 performers 不为空且 artist 为空，用 performers 的第一个
+    final finalArtist2 = finalArtist.isNotEmpty
+        ? finalArtist
+        : (raw.performers.isNotEmpty ? raw.performers.first : '未知艺术家');
+
     return NormalizedMetadata(
       title: finalTitle,
-      artist: finalArtist,
+      artist: finalArtist2,
       album: album,
-      albumArtist: albumArtist,
-      composer: raw.composer.trim(),
-      genre: raw.genre.trim(),
+      genres: raw.genres,
+      performers: raw.performers,
       year: raw.year,
       trackNumber: raw.trackNumber,
+      trackTotal: raw.trackTotal,
       discNumber: raw.discNumber,
+      totalDisc: raw.totalDisc,
+      duration: raw.duration,
       artwork: raw.artwork,
     );
   }
 
   String _inferTitleFromFileName(String fileName) {
-    // 去掉扩展名
     final dotIndex = fileName.lastIndexOf('.');
     if (dotIndex > 0) {
       return fileName.substring(0, dotIndex).trim();
@@ -43,10 +47,8 @@ class MetadataNormalizer {
   }
 
   String _inferArtistFromPath(String filePath) {
-    // 简单推断：尝试从路径中的文件夹名获取
     final parts = filePath.split(RegExp(r'[/\\]'));
     if (parts.length >= 2) {
-      // 倒数第二个文件夹可能是艺术家
       final candidate = parts[parts.length - 2].trim();
       if (candidate.isNotEmpty && !candidate.contains(' ')) {
         return candidate;
@@ -55,10 +57,8 @@ class MetadataNormalizer {
     return '未知艺术家';
   }
 
-  /// 评估候选元数据（第一阶段：直接接受，不纠错）
   CandidateMetadata evaluate(
       NormalizedMetadata normalized, List<Map<String, dynamic>> history) {
-    // 第一阶段：置信度固定为 0.8（文件名+标签混合）
     return CandidateMetadata(
       metadata: normalized,
       confidence: 0.8,
@@ -66,18 +66,22 @@ class MetadataNormalizer {
     );
   }
 
-  /// 决策是否修正（第一阶段：直接接受）
   FinalMetadata decide(CandidateMetadata candidate, {double threshold = 0.6}) {
     return FinalMetadata(
       title: candidate.metadata.title,
       artist: candidate.metadata.artist,
       album: candidate.metadata.album,
-      albumArtist: candidate.metadata.albumArtist,
-      composer: candidate.metadata.composer,
-      genre: candidate.metadata.genre,
+      genre: candidate.metadata.genres.isNotEmpty
+          ? candidate.metadata.genres.first
+          : '',
+      genres: candidate.metadata.genres,
+      performers: candidate.metadata.performers,
       year: candidate.metadata.year,
       trackNumber: candidate.metadata.trackNumber,
+      trackTotal: candidate.metadata.trackTotal,
       discNumber: candidate.metadata.discNumber,
+      totalDisc: candidate.metadata.totalDisc,
+      duration: candidate.metadata.duration,
       artwork: candidate.metadata.artwork,
       source: 'normalized',
     );
diff --git a/lib/metadata/metadata_reader.dart b/lib/metadata/metadata_reader.dart
index 955221e..dc80765 100644
--- a/lib/metadata/metadata_reader.dart
+++ b/lib/metadata/metadata_reader.dart
@@ -1,30 +1,39 @@
 // lib/metadata/metadata_reader.dart
 import 'dart:io';
+import 'package:audio_metadata_reader/audio_metadata_reader.dart' as amr;
 import 'metadata_model.dart';
 
-/// 底层元数据读取器（封装 audio_metadata_reader）
 class MetadataReader {
-  /// 从本地文件读取原始元数据
   Future<RawMetadata> readRawMetadata(File file) async {
     try {
-      // TODO: 安装 audio_metadata_reader 后实现
-      // final meta = await amr.readMetadata(file, getImage: false);
-      // return RawMetadata(
-      //   title: meta.title ?? '',
-      //   artist: meta.artist ?? '',
-      //   album: meta.album ?? '',
-      //   albumArtist: meta.albumArtist ?? '',
-      //   composer: meta.composer ?? '',
-      //   genre: meta.genre ?? '',
-      //   year: meta.year ?? 0,
-      //   trackNumber: meta.trackNumber ?? 0,
-      //   discNumber: meta.discNumber ?? 0,
-      // );
+      final meta = amr.readMetadata(file, getImage: false);
 
-      // 临时返回空，等待接入 audio_metadata_reader
-      return const RawMetadata();
+      return RawMetadata(
+        title: meta.title ?? '',
+        artist: meta.artist ?? '',
+        album: meta.album ?? '',
+        // ⭐ genres 和 performers 是非空 List<String>，直接使用
+        genres: meta.genres,
+        performers: meta.performers,
+        year: _toInt(meta.year),
+        trackNumber: _toInt(meta.trackNumber),
+        trackTotal: _toInt(meta.trackTotal),
+        discNumber: _toInt(meta.discNumber),
+        totalDisc: _toInt(meta.totalDisc),
+        duration: meta.duration,
+      );
     } catch (e) {
       return const RawMetadata();
     }
   }
+
+  /// 安全转换为 int，处理 Object 类型
+  int _toInt(dynamic value) {
+    if (value == null) return 0;
+    if (value is int) return value;
+    if (value is String) return int.tryParse(value) ?? 0;
+    // 有些字段可能是 double 或 num
+    if (value is num) return value.toInt();
+    return 0;
+  }
 }
diff --git a/lib/metadata/metadata_service.dart b/lib/metadata/metadata_service.dart
index 328b91a..1fef191 100644
--- a/lib/metadata/metadata_service.dart
+++ b/lib/metadata/metadata_service.dart
@@ -1,8 +1,5 @@
 // lib/metadata/metadata_service.dart
-import 'dart:io';
 import 'metadata_model.dart';
-import 'metadata_reader.dart';
-import 'metadata_normalizer.dart';
 import 'metadata_cache.dart';
 
 class MetadataService {
@@ -10,18 +7,16 @@ class MetadataService {
   factory MetadataService() => _instance;
   MetadataService._internal();
 
-  final MetadataReader _reader = MetadataReader();
-  final MetadataNormalizer _normalizer = MetadataNormalizer();
   final MetadataCache _cache = MetadataCache();
 
-  /// 获取歌曲的最终元数据（优先缓存，否则读取文件）
+  /// 临时版本：不进行实际文件读取，只返回基于文件名的 fallback
   Future<FinalMetadata> getMetadata({
-    required String filePath,
+    required String url,
     required String fileName,
     required String fileId,
     bool forceRefresh = false,
   }) async {
-    // 1. 尝试从缓存读取
+    // 1. 检查缓存（如果有）
     if (!forceRefresh) {
       final cached = await _cache.get(fileId);
       if (cached != null && cached.isNotEmpty) {
@@ -29,39 +24,17 @@ class MetadataService {
       }
     }
 
-    // 2. 检查文件是否存在
-    final file = File(filePath);
-    if (!await file.exists()) {
-      // 文件不存在，返回基于文件名的推断
-      return _fallbackFromFileName(fileName);
+    // 2. 暂时不读取文件，直接 fallback
+    final fallback = _fallbackFromFileName(fileName);
+
+    // 3. 缓存结果（即使 fallback 也缓存，避免频繁调用）
+    if (fallback.isNotEmpty) {
+      await _cache.put(fileId, fallback);
     }
 
-    // 3. 从文件读取原始元数据
-    final raw = await _reader.readRawMetadata(file);
-
-    // 4. 标准化
-    final normalized = _normalizer.normalize(
-      raw,
-      fileName: fileName,
-      filePath: filePath,
-    );
-
-    // 5. 评估（第一阶段直接接受）
-    final history = await _cache.getHistory(normalized.artist, limit: 10);
-    final candidate = _normalizer.evaluate(normalized, history);
-
-    // 6. 决策
-    final finalMetadata = _normalizer.decide(candidate);
-
-    // 7. 写入缓存
-    if (finalMetadata.isNotEmpty) {
-      await _cache.put(fileId, finalMetadata);
-    }
-
-    return finalMetadata;
+    return fallback;
   }
 
-  /// Fallback：从文件名推断
   FinalMetadata _fallbackFromFileName(String fileName) {
     final dotIndex = fileName.lastIndexOf('.');
     final title = dotIndex > 0 ? fileName.substring(0, dotIndex) : fileName;
diff --git a/lib/pages/player_page.dart b/lib/pages/player_page.dart
index f20223a..32386c4 100644
--- a/lib/pages/player_page.dart
+++ b/lib/pages/player_page.dart
@@ -167,9 +167,11 @@ class _PlayerPageState extends State<PlayerPage> {
   }
 
   Widget _buildProgressSection(AudioService service, Duration duration) {
+    debugPrint('🎯 [PlayerPage] duration=$duration');
     return ValueListenableBuilder(
       valueListenable: service.positionNotifier,
       builder: (context, position, _) {
+        debugPrint('🎯 [PlayerPage] position=$position, duration=$duration');
         final progress = duration.inMilliseconds > 0
             ? position.inMilliseconds / duration.inMilliseconds
             : 0.0;
diff --git a/lib/services/audio_player_handler.dart b/lib/services/audio_player_handler.dart
index c3e7fb5..5c0784b 100644
--- a/lib/services/audio_player_handler.dart
+++ b/lib/services/audio_player_handler.dart
@@ -39,6 +39,7 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     });
 
     _player.durationStream.listen((duration) {
+      debugPrint('🎯 [durationStream] duration=$duration');
       _state.updateDuration(duration);
       if (_currentId != null && _currentTitle != null) {
         _updateMediaItem(
diff --git a/lib/services/audio_service.dart b/lib/services/audio_service.dart
index 4e983dd..b69d33b 100644
--- a/lib/services/audio_service.dart
+++ b/lib/services/audio_service.dart
@@ -3,7 +3,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:media_kit/media_kit.dart';
 import 'playback_service.dart';
-import '../metadata/metadata_service.dart'; // ⭐ 新增
+import '../metadata/metadata_service.dart';
 
 enum PlayMode {
   sequential,
@@ -30,7 +30,7 @@ class AudioService extends ChangeNotifier {
   factory AudioService() => _instance;
   AudioService._internal();
 
-  // ---- 基础状态（低频，触发 UI 重建） ----
+  // ---- 基础状态 ----
   Song? _currentSong;
   bool _isPlaying = false;
   PlayMode _playMode = PlayMode.sequential;
@@ -41,7 +41,7 @@ class AudioService extends ChangeNotifier {
   List<int> _shuffledIndices = [];
   int _shuffledIndex = -1;
 
-  // ---- ⭐ 高频进度（用 ValueNotifier，不触发全局重建） ----
+  // ---- 高频进度 ----
   final ValueNotifier<Duration> positionNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> durationNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> bufferedNotifier = ValueNotifier(Duration.zero);
@@ -49,13 +49,10 @@ class AudioService extends ChangeNotifier {
   bool _listening = false;
   final List<StreamSubscription> _subscriptions = [];
 
-  // ⭐ 防重入标志
   bool _handlingCompletion = false;
-
-  // ⭐ 歌曲切换回调（用于通知 Handler 更新 MediaItem）
   void Function(Song)? _onSongChanged;
 
-  // ---- Getter（高频字段不走 ChangeNotifier） ----
+  // ---- Getter ----
   Song? get currentSong => _currentSong;
   bool get isPlaying => _isPlaying;
   PlayMode get playMode => _playMode;
@@ -63,7 +60,6 @@ class AudioService extends ChangeNotifier {
   int get currentIndex => _currentIndex;
   bool get hasQueue => _queue.isNotEmpty;
 
-  // ---- 兼容旧代码：提供 getter 返回 ValueNotifier 的值 ----
   Duration get position => positionNotifier.value;
   Duration get duration => durationNotifier.value;
   Duration get bufferedPosition => bufferedNotifier.value;
@@ -79,12 +75,10 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 注册歌曲切换回调 ----
   void setOnSongChanged(void Function(Song) callback) {
     _onSongChanged = callback;
   }
 
-  // ---- 切换播放模式 ----
   void togglePlayMode() {
     switch (_playMode) {
       case PlayMode.sequential:
@@ -100,7 +94,6 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 设置播放队列 ----
   void setQueue(List<Song> queue, {int startIndex = 0}) {
     if (queue.isEmpty) {
       _clearQueue();
@@ -129,7 +122,6 @@ class AudioService extends ChangeNotifier {
     stopPlay();
   }
 
-  // ---- 播放指定歌曲 ----
   Future<void> playSong(Song song) async {
     if (_queue.isEmpty || _queue[_currentIndex].id != song.id) {
       setQueue([song], startIndex: 0);
@@ -138,6 +130,9 @@ class AudioService extends ChangeNotifier {
     }
   }
 
+  // ============================================================
+  // 核心播放逻辑
+  // ============================================================
   void _playCurrent() {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) {
       stopPlay();
@@ -147,13 +142,8 @@ class AudioService extends ChangeNotifier {
     final song = _queue[_currentIndex];
     _currentSong = song;
 
-    // ⭐ 切歌时触发回调（通知 Handler 更新 MediaItem）
-    _onSongChanged?.call(song);
-
-    // ⭐ 重置进度（用 ValueNotifier）
-    positionNotifier.value = Duration.zero;
-    durationNotifier.value = Duration.zero;
-    bufferedNotifier.value = Duration.zero;
+    // ⭐ 不重置任何 Notifier，完全依赖 stream 推送
+    // position / duration / buffered 由播放器自然更新
 
     _startListening();
     notifyListeners();
@@ -164,27 +154,27 @@ class AudioService extends ChangeNotifier {
 
     PlaybackService().play(song.url!);
 
-    // ⭐ 异步加载 metadata（不阻塞播放）
+    // ⭐ 兜底：主动同步一次播放器状态（解决首次加载时 stream 未推送的问题）
+    _syncPlayerStateDelayed();
+
     _loadMetadataForCurrentSong();
   }
 
-  // ⭐ 新增：加载当前歌曲的 metadata
+  // ============================================================
+  // Metadata 加载
+  // ============================================================
   Future<void> _loadMetadataForCurrentSong() async {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) return;
-
     final song = _queue[_currentIndex];
     if (song.url == null || song.url!.isEmpty) return;
 
     try {
-      // 注意：filePath 需要是本地文件路径
-      // WebDAV 文件可能需要先缓存到本地
       final metadata = await MetadataService().getMetadata(
-        filePath: song.url!,
+        url: song.url!,
         fileName: song.title,
         fileId: song.id,
       );
 
-      // 如果 metadata 有效且与当前不同，更新 Song
       if (metadata.isNotEmpty) {
         final updatedSong = Song(
           id: song.id,
@@ -198,12 +188,13 @@ class AudioService extends ChangeNotifier {
         _onSongChanged?.call(updatedSong);
       }
     } catch (e) {
-      // 读取失败，保持原有信息
       debugPrint('⚠️ [AudioService] metadata load failed: $e');
     }
   }
 
-  // ---- 下一首 ----
+  // ============================================================
+  // 播放控制
+  // ============================================================
   void next() {
     if (_queue.isEmpty) return;
 
@@ -221,7 +212,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 上一首 ----
   void previous() {
     if (_queue.isEmpty) return;
 
@@ -247,7 +237,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 播放/暂停 ----
   void togglePlay() {
     if (_currentSong == null) return;
 
@@ -282,7 +271,38 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 监听 media_kit 状态 ----
+  // ============================================================
+  // 播放器状态同步（兜底机制）
+  // ============================================================
+  void _syncPlayerStateDelayed() {
+    _syncPlayerStateNow();
+    Future.delayed(const Duration(milliseconds: 200), () {
+      _syncPlayerStateNow();
+    });
+    Future.delayed(const Duration(milliseconds: 500), () {
+      _syncPlayerStateNow();
+    });
+  }
+
+  void _syncPlayerStateNow() {
+    final player = PlaybackService().player;
+    final dur = player.state.duration;
+    final buf = player.state.buffer;
+
+    if (dur.inMilliseconds > 0 && durationNotifier.value.inMilliseconds == 0) {
+      durationNotifier.value = dur;
+      debugPrint('🎯 [AudioService] sync duration: $dur');
+    }
+
+    if (buf.inMilliseconds > 0 && bufferedNotifier.value.inMilliseconds == 0) {
+      bufferedNotifier.value = buf;
+      debugPrint('🎯 [AudioService] sync buffer: $buf');
+    }
+  }
+
+  // ============================================================
+  // media_kit 状态监听
+  // ============================================================
   void _startListening() {
     if (_listening) return;
     _listening = true;
@@ -306,7 +326,11 @@ class AudioService extends ChangeNotifier {
 
     _subscriptions.add(
       player.stream.duration.listen((duration) {
-        durationNotifier.value = duration;
+        debugPrint('🎯 [AudioService] durationStream: $duration');
+        // 只接受 > 0 的值，避免 0 覆盖正确值
+        if (duration.inMilliseconds > 0) {
+          durationNotifier.value = duration;
+        }
       }),
     );
 
@@ -331,7 +355,9 @@ class AudioService extends ChangeNotifier {
     _subscriptions.clear();
   }
 
-  // ⭐ 防重入的完成事件处理
+  // ============================================================
+  // 播放完成处理
+  // ============================================================
   void _onPlaybackCompleted() {
     if (_handlingCompletion) {
       debugPrint('⚠️ [service] completed ignored: already handling');