diff --git a/README.md b/README.md
index 2e7a572..9f8ff5d 100644
--- a/README.md
+++ b/README.md
@@ -1,17 +1,11 @@
 # im_webview_app
 
-Flutter WebView 套壳 App，启动后会请求 `/client_config/query` 获取 H5 线路配置，并加载第一条可用线路。
+Flutter WebView 套壳 App。启动时只会生成并加载一个 H5 URL；如果当前 URL 探测或加载失败，壳层会重新生成下一个 URL 并替换当前 WebView，项目运行过程中始终只持有一个 H5 URL。
 
-默认情况下，非本地 Web 访问会使用当前服务地址的 origin 作为 H5 线路和接口域名，例如访问 `https://app.example.com/app/` 时会请求 `https://app.example.com/client_config/query`。本地访问（如 `localhost`、`127.0.0.1`）继续使用固定兜底域名 `https://h5-test.imharry.work/`。
+默认 URL 来自代码中的泛域名模板，会生成 16 位数字子域名，并通过查询参数把 Flutter 壳请求地址传给 H5：
 
-## H5 线路切换
-
-线路切换在 Flutter 套壳层完成。远程配置不可用时，会先使用启动兜底线路；也可以在打包时覆盖启动线路或配置接口地址：
-
-```bash
-flutter build apk --release --dart-define=H5_LINE_URLS=https://h5-one.example/,https://h5-two.example/
-flutter build apk --release --dart-define=CLIENT_CONFIG_QUERY_URL=https://api.example.com/client_config/query
-flutter build apk --release --dart-define=BOOTSTRAP_H5_LINE_URL=https://h5-one.example/
+```text
+https://1234567890123456.albzyuxq.vip/?flutter_shell=1&flutter_shell_url=https%3A%2F%2F1234567890123456.albzyuxq.vip
 ```
 
 ## 本地打包
diff --git a/lib/config/app_config.dart b/lib/config/app_config.dart
index 9c8d3e9..36218d4 100644
--- a/lib/config/app_config.dart
+++ b/lib/config/app_config.dart
@@ -12,175 +12,52 @@ class H5Line {
   Uri get uri => Uri.parse(url);
 }
 
-enum Environment {
-  development,
-  staging,
-  production,
-}
-
 class AppConfig {
   static const String appName = '本地打包';
   static const String appLogo = '';
-  static const String clientConfigDevice = 'h5';
-  static const String clientConfigSerialNo = 'h5-domain';
-  static const String _dartDefinedH5LineUrls =
-      String.fromEnvironment('H5_LINE_URLS');
-  static const String _dartDefinedClientConfigQueryUrl =
-      String.fromEnvironment('CLIENT_CONFIG_QUERY_URL');
-  // Bootstrap only: used before /client_config/query returns dynamic H5 domains.
-  static const String _bootstrapH5LineUrl = String.fromEnvironment(
-      'BOOTSTRAP_H5_LINE_URL',
-      defaultValue: 'https://h5-test.imharry.work/');
-  static const Environment currentEnvironment = Environment.production;
-  // Compatibility for the packaging service's legacy domain rewrite step.
-  static final Map<Environment, List<String>> _environmentHosts = {
-    Environment.production: [
-      _bootstrapH5LineUrl,
-    ],
-  };
-  static final Random _wildcardRandom = Random.secure();
 
-  static List<H5Line> get h5Lines {
-    final configuredUrls = _dartDefinedH5LineUrls.trim().isEmpty
-        ? _normalizedUniqueUrls(defaultH5LineUrlsForBaseUri(Uri.base))
-        : _normalizedUniqueUrls(_dartDefinedH5LineUrls.split(','));
-    final urls = configuredUrls.isEmpty
-        ? _normalizedUniqueUrls(const [_bootstrapH5LineUrl])
-        : configuredUrls;
+  static const String flutterShellMarkerQueryKey = 'flutter_shell';
+  static const String flutterShellUrlQueryKey = 'flutter_shell_url';
+  static const List<String> wildcardH5DomainTemplates = [
+    '*.albzyuxq.vip',
+    '*.zdyswvnt.vip',
+    '*.gxifpxcr.vip',
+  ];
 
-    return [
-      for (var index = 0; index < urls.length; index += 1)
-        H5Line(label: '线路${index + 1}', url: urls[index]),
-    ];
-  }
+  static final Random _random = Random.secure();
 
-  static Map<String, String> get clientConfigQueryPayload => const {
-        'device': clientConfigDevice,
-        'serialNo': clientConfigSerialNo,
-      };
+  static H5Line get h5Line => createRandomH5Line();
 
-  static List<Uri> get clientConfigQueryUris {
-    final dartDefinedUrl = _dartDefinedClientConfigQueryUrl.trim();
-    if (dartDefinedUrl.isNotEmpty) {
-      return [Uri.parse(dartDefinedUrl)];
-    }
-
-    final lines = h5Lines;
-    if (lines.isEmpty) {
-      return const [];
-    }
-
-    return clientConfigQueryUrisForHomeUri(lines.first.uri);
-  }
-
-  static List<String> defaultH5LineUrlsForBaseUri(Uri baseUri) {
-    final runtimeHomeUrl = _runtimeHomeUrlFromBaseUri(baseUri);
-    if (runtimeHomeUrl != null) {
-      return [runtimeHomeUrl];
-    }
-
-    final environmentHosts = _environmentHosts[currentEnvironment];
-    if (environmentHosts == null || environmentHosts.isEmpty) {
-      return const [_bootstrapH5LineUrl];
-    }
-    return environmentHosts;
-  }
-
-  static List<Uri> clientConfigQueryUrisForHomeUri(Uri homeUri) {
-    return [
-      _originUriWithPath(homeUri, '/client_config/query'),
-      _originUriWithPath(homeUri, '/api/user/client_config/query'),
-    ];
-  }
-
-  static List<H5Line> h5LinesFromResourceUrl(
-    String resourceUrl, {
+  static H5Line createRandomH5Line({
+    int attempt = 0,
     String Function()? wildcardFactory,
   }) {
-    final urls = _normalizedUniqueUrls(
-      splitResourceUrlLines(resourceUrl).map(
-        (value) => _replaceWildcardHost(
-          value,
-          wildcardFactory: wildcardFactory,
-        ),
+    final template = wildcardH5DomainTemplates[
+        attempt.abs() % wildcardH5DomainTemplates.length];
+    return h5LineFromUrl(
+      _buildFlutterShellHomeUrl(
+        _replaceWildcardHost(template, wildcardFactory: wildcardFactory),
       ),
     );
-
-    return [
-      for (var index = 0; index < urls.length; index += 1)
-        H5Line(label: '线路${index + 1}', url: urls[index]),
-    ];
   }
 
-  static List<String> splitResourceUrlLines(String resourceUrl) {
-    if (resourceUrl.trim().isEmpty) {
-      return const [];
-    }
-
-    final lines = <String>[];
-    final seen = <String>{};
-    for (final value
-        in resourceUrl.split(RegExp(r'\\r\\n|\\n|\\r|\\t|[\r\n\t]+'))) {
-      final line = value.trim();
-      if (line.isEmpty || seen.contains(line)) {
-        continue;
-      }
-      lines.add(line);
-      seen.add(line);
-    }
-    return List.unmodifiable(lines);
+  static H5Line h5LineFromUrl(String value) {
+    return H5Line(label: '线路1', url: _normalizeHomeUrl(value));
   }
 
-  static bool isLoginPageUrl(String? url) {
-    if (url == null || url.isEmpty) {
-      return false;
-    }
-
-    final uri = Uri.tryParse(url);
-    if (uri == null) {
-      return false;
-    }
-
-    return _isLoginPath(uri.path) || _isLoginPath(uri.fragment);
+  static String originForUrl(String value) {
+    final uri = Uri.parse(value);
+    return '${uri.scheme}://${uri.authority}';
   }
 
-  static bool _isLoginPath(String path) {
-    final normalized = path.trim();
-    if (normalized.isEmpty) {
-      return false;
-    }
-
-    final pathOnly = normalized.split('?').first.split('#').first;
-    final segments = pathOnly.split('/').where((segment) => segment.isNotEmpty);
-    if (segments.isEmpty) {
-      return false;
-    }
-
-    return segments.last == 'login';
-  }
-
-  static List<String> _normalizedUniqueUrls(Iterable<String> values) {
-    final urls = <String>[];
-    final seen = <String>{};
-
-    for (final value in values) {
-      final normalized = _tryNormalizeHomeUrl(value);
-      if (normalized == null || seen.contains(normalized)) {
-        continue;
-      }
-      urls.add(normalized);
-      seen.add(normalized);
-    }
-
-    return List.unmodifiable(urls);
-  }
-
-  static String? _tryNormalizeHomeUrl(String value) {
-    try {
-      return _normalizeHomeUrl(value);
-    } catch (_) {
-      return null;
-    }
+  static String _buildFlutterShellHomeUrl(String host) {
+    final normalized = _normalizeHomeUrl(host);
+    final uri = Uri.parse(normalized);
+    final origin = originForUrl(normalized);
+    final queryParameters = Map<String, String>.from(uri.queryParameters)
+      ..[flutterShellMarkerQueryKey] = '1'
+      ..[flutterShellUrlQueryKey] = origin;
+    return uri.replace(queryParameters: queryParameters).toString();
   }
 
   static String _normalizeHomeUrl(String host) {
@@ -198,69 +75,6 @@ class AppConfig {
     return uri.replace(path: path).toString();
   }
 
-  static String? _runtimeHomeUrlFromBaseUri(Uri baseUri) {
-    if (_isLocalRuntimeUri(baseUri)) {
-      return null;
-    }
-
-    return _originUriWithPath(baseUri, '/').toString();
-  }
-
-  static Uri _originUriWithPath(Uri uri, String path) {
-    final normalizedPath = path.startsWith('/') ? path : '/$path';
-    return Uri.parse('${uri.scheme}://${uri.authority}$normalizedPath');
-  }
-
-  static bool _isLocalRuntimeUri(Uri uri) {
-    if (uri.scheme != 'http' && uri.scheme != 'https') {
-      return true;
-    }
-
-    final host = _normalizeHostForCompare(uri.host);
-    if (host.isEmpty) {
-      return true;
-    }
-
-    if (host == 'localhost' || host.endsWith('.localhost') || host == '::1') {
-      return true;
-    }
-
-    final ipv4Parts = _tryParseIpv4Address(host);
-    if (ipv4Parts == null) {
-      return false;
-    }
-
-    return ipv4Parts[0] == 127 || ipv4Parts.every((part) => part == 0);
-  }
-
-  static String _normalizeHostForCompare(String host) {
-    final normalized = host.trim().toLowerCase();
-    if (normalized.endsWith('.')) {
-      return normalized.substring(0, normalized.length - 1);
-    }
-    return normalized;
-  }
-
-  static List<int>? _tryParseIpv4Address(String host) {
-    final parts = host.split('.');
-    if (parts.length != 4) {
-      return null;
-    }
-
-    final octets = <int>[];
-    for (final part in parts) {
-      if (part.isEmpty || !RegExp(r'^\d+$').hasMatch(part)) {
-        return null;
-      }
-      final value = int.tryParse(part);
-      if (value == null || value < 0 || value > 255) {
-        return null;
-      }
-      octets.add(value);
-    }
-    return octets;
-  }
-
   static String _replaceWildcardHost(
     String value, {
     String Function()? wildcardFactory,
@@ -276,12 +90,10 @@ class AppConfig {
   }
 
   static String _randomWildcardLabel() {
-    const chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
-    return String.fromCharCodes(
-      List<int>.generate(
-        16,
-        (_) => chars.codeUnitAt(_wildcardRandom.nextInt(chars.length)),
-      ),
-    );
+    final digits = StringBuffer(_random.nextInt(9) + 1);
+    for (var index = 1; index < 16; index += 1) {
+      digits.write(_random.nextInt(10));
+    }
+    return digits.toString();
   }
 }
diff --git a/lib/main.dart b/lib/main.dart
index 2088d05..905eae2 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -25,7 +25,20 @@ const _h5CacheChannel =
     MethodChannel('io.openim.flutter.im_webview_app/h5_cache');
 const _keyboardAnimationDuration = Duration(milliseconds: 250);
 const _initialH5CacheClearedKey = 'initial_h5_cache_cleared_v1';
+const _h5DomainCacheDateKey = 'h5_random_domain_date_v1';
+const _h5DomainCacheSessionKey = 'h5_random_domain_session_v1';
+const _h5DomainCacheUrlKey = 'h5_random_domain_url_v1';
 const _lineProbeTimeout = Duration(seconds: 5);
+const _maxGeneratedLineAttempts = 6;
+final String _h5DomainProcessSession =
+    'session-${DateTime.now().microsecondsSinceEpoch}';
+
+String _domainDateKey(DateTime value) {
+  final year = value.year.toString().padLeft(4, '0');
+  final month = value.month.toString().padLeft(2, '0');
+  final day = value.day.toString().padLeft(2, '0');
+  return '$year-$month-$day';
+}
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -111,44 +124,45 @@ class H5ShellPage extends StatefulWidget {
   State<H5ShellPage> createState() => _H5ShellPageState();
 }
 
-class _H5ShellPageState extends State<H5ShellPage> {
-  late List<H5Line> _h5Lines;
-  late List<_H5LineWebViewSlot> _lineSlots;
+class _H5ShellPageState extends State<H5ShellPage> with WidgetsBindingObserver {
+  late H5Line _h5Line;
+  late _H5LineWebViewSlot _lineSlot;
 
   bool _shellBrandingLoaded = false;
   bool _isPreparingInitialLine = true;
-  bool _isAutoSwitchingLine = false;
-  int _currentLineIndex = 0;
+  bool _isReplacingUnavailableLine = false;
   double _lastKeyboardInset = 0;
   bool _lastKeyboardVisible = false;
   int _keyboardSyncToken = 0;
-  int _lineProbeGeneration = 0;
+  int _lineGeneration = 0;
+  int _h5LineAttempt = 0;
   late ShellBranding _shellBranding;
   Future<void>? _cacheClearTask;
+  Timer? _domainExpiryTimer;
+  String _activeDomainDateKey = '';
 
-  H5Line get _currentLine => _h5Lines[_currentLineIndex];
-  _H5LineWebViewSlot get _currentSlot => _lineSlots[_currentLineIndex];
+  _H5LineWebViewSlot get _currentSlot => _lineSlot;
 
   @override
   void initState() {
     super.initState();
-    _h5Lines = AppConfig.h5Lines;
+    WidgetsBinding.instance.addObserver(this);
+    _h5Line = AppConfig.h5Line;
     _shellBranding = widget.initialShellBranding;
-    _lineSlots = _createLineSlots(_h5Lines);
+    _lineSlot = _createLineSlot(_h5Line);
+    _scheduleDomainExpiryTimer();
     unawaited(_initializeLines());
   }
 
-  List<_H5LineWebViewSlot> _createLineSlots(List<H5Line> lines) {
-    return [
-      for (var index = 0; index < lines.length; index += 1)
-        _H5LineWebViewSlot(
-          line: lines[index],
-          controller: _buildController(index),
-        ),
-    ];
+  _H5LineWebViewSlot _createLineSlot(H5Line line) {
+    final generation = _lineGeneration;
+    return _H5LineWebViewSlot(
+      line: line,
+      controller: _buildController(generation),
+    );
   }
 
-  WebViewController _buildController(int lineIndex) {
+  WebViewController _buildController(int generation) {
     final controller = WebViewController(
       onPermissionRequest: (request) {
         unawaited(_handleWebViewPermissionRequest(request));
@@ -157,51 +171,59 @@ class _H5ShellPageState extends State<H5ShellPage> {
       ..setJavaScriptMode(JavaScriptMode.unrestricted)
       ..addJavaScriptChannel(
         'OpenIMShell',
-        onMessageReceived: (message) => _handleShellMessage(lineIndex, message),
+        onMessageReceived: (message) => _handleShellMessage(
+          generation,
+          message,
+        ),
       )
       ..addJavaScriptChannel(
         'OpenIMFlutterShell',
-        onMessageReceived: (message) =>
-            _handleFlutterShellMessage(lineIndex, message),
+        onMessageReceived: (message) => _handleFlutterShellMessage(
+          generation,
+          message,
+        ),
       )
       ..setBackgroundColor(Colors.white)
       ..setNavigationDelegate(
         NavigationDelegate(
           onProgress: (progress) {
-            final slot = _lineSlots[lineIndex];
+            if (!_isCurrentLineGeneration(generation)) {
+              return;
+            }
+            final slot = _lineSlot;
             final nextProgress = progress.clamp(0, 100).toInt();
             if (slot.progress == nextProgress) {
               return;
             }
 
             slot.progress = nextProgress;
-            if (mounted &&
-                lineIndex == _currentLineIndex &&
-                slot.isAwaitingFirstScreen) {
+            if (mounted && slot.isAwaitingFirstScreen) {
               setState(() {});
             }
           },
           onPageStarted: (url) {
-            final slot = _lineSlots[lineIndex];
+            if (!_isCurrentLineGeneration(generation)) {
+              return;
+            }
+            final slot = _lineSlot;
             final shouldShowCover = !slot.hasPresentedFirstScreen;
             slot.shellCoverFallbackTimer?.cancel();
-            slot.setCurrentUrl(url);
             slot.loadError = null;
             slot.progress = 0;
             slot.showShellCover = shouldShowCover;
-            if (mounted && lineIndex == _currentLineIndex) {
+            if (mounted) {
               setState(() {});
             }
           },
           onPageFinished: (_) {
-            unawaited(_handlePageFinished(lineIndex));
-          },
-          onUrlChange: (change) {
-            _updateSlotUrl(lineIndex, change.url);
+            unawaited(_handlePageFinished(generation));
           },
           onWebResourceError: (error) {
+            if (!_isCurrentLineGeneration(generation)) {
+              return;
+            }
             if (error.isForMainFrame ?? true) {
-              _handleMainFrameLoadError(lineIndex, error.description);
+              _handleMainFrameLoadError(error.description);
             }
           },
           onNavigationRequest: _handleNavigationRequest,
@@ -246,45 +268,131 @@ class _H5ShellPageState extends State<H5ShellPage> {
 
   @override
   void dispose() {
-    for (final slot in _lineSlots) {
-      slot.dispose();
-    }
+    WidgetsBinding.instance.removeObserver(this);
+    _domainExpiryTimer?.cancel();
+    _lineSlot.dispose();
     super.dispose();
   }
 
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed) {
+      unawaited(_refreshExpiredH5LinesIfNeeded());
+    }
+  }
+
   Future<void> _initializeLines() async {
     await _clearInitialH5CachesIfNeeded();
+    await _prepareAndLoadH5Line(forceNew: false);
+  }
+
+  Future<void> _prepareAndLoadH5Line({required bool forceNew}) async {
+    var shouldCreateNewLine = forceNew;
+    for (var attempt = 0; attempt < _maxGeneratedLineAttempts; attempt += 1) {
+      final line = await _loadCachedOrCreateH5Line(
+        forceNew: shouldCreateNewLine,
+      );
+      if (!mounted) {
+        return;
+      }
+
+      _replaceLineSlotIfNeeded(line);
+      final available = await _probeCurrentLine();
+      if (!mounted) {
+        return;
+      }
+
+      if (available) {
+        setState(() {
+          _isPreparingInitialLine = false;
+        });
+        await _loadCurrentLine(forceReload: true);
+        _scheduleDomainExpiryTimer();
+        return;
+      }
+
+      shouldCreateNewLine = true;
+    }
 
-    final runtimeLines = await _fetchRuntimeH5Lines();
     if (!mounted) {
       return;
     }
 
-    if (runtimeLines.isNotEmpty && !_hasSameLineUrls(_h5Lines, runtimeLines)) {
-      setState(() {
-        _replaceLineSlots(runtimeLines);
-      });
-    }
-
-    final firstAvailableIndex = await _probeLinesUntilFirstAvailable();
-    if (!mounted) {
-      return;
-    }
-
-    if (firstAvailableIndex == null) {
-      setState(() {
-        _isPreparingInitialLine = false;
-        _currentLineIndex = 0;
-        _currentSlot.loadError = '所有线路暂不可用，请稍后重试';
-        _currentSlot.showShellCover = false;
-      });
-      return;
-    }
-
     setState(() {
       _isPreparingInitialLine = false;
+      _currentSlot.loadError = '当前线路暂不可用，请稍后重试';
+      _currentSlot.showShellCover = false;
     });
-    await _loadLine(firstAvailableIndex);
+    _scheduleDomainExpiryTimer();
+  }
+
+  Future<H5Line> _loadCachedOrCreateH5Line({
+    required bool forceNew,
+  }) async {
+    final today = _domainDateKey(DateTime.now());
+    _activeDomainDateKey = today;
+
+    try {
+      final preferences = await SharedPreferences.getInstance();
+      final cachedUrl = preferences.getString(_h5DomainCacheUrlKey);
+      final cachedLine =
+          cachedUrl == null ? null : AppConfig.h5LineFromUrl(cachedUrl);
+      final canUseCachedLine = !forceNew &&
+          preferences.getString(_h5DomainCacheDateKey) == today &&
+          preferences.getString(_h5DomainCacheSessionKey) ==
+              _h5DomainProcessSession &&
+          cachedLine != null;
+
+      if (canUseCachedLine) {
+        _logH5Line('复用本进程当天随机线路', cachedLine);
+        return cachedLine;
+      }
+
+      final line = AppConfig.createRandomH5Line(attempt: _h5LineAttempt);
+      _h5LineAttempt += 1;
+      await preferences.setString(_h5DomainCacheDateKey, today);
+      await preferences.setString(
+        _h5DomainCacheSessionKey,
+        _h5DomainProcessSession,
+      );
+      await preferences.setString(_h5DomainCacheUrlKey, line.url);
+      _logH5Line('生成当天随机线路', line);
+      return line;
+    } catch (_) {
+      final line = AppConfig.createRandomH5Line(attempt: _h5LineAttempt);
+      _h5LineAttempt += 1;
+      _logH5Line('本地缓存不可用，生成临时随机线路', line);
+      return line;
+    }
+  }
+
+  Future<void> _refreshExpiredH5LinesIfNeeded() async {
+    final today = _domainDateKey(DateTime.now());
+    if (_isPreparingInitialLine || _activeDomainDateKey == today) {
+      _scheduleDomainExpiryTimer();
+      return;
+    }
+
+    if (mounted) {
+      setState(() {
+        _isPreparingInitialLine = true;
+      });
+    }
+
+    await _clearAllH5Caches();
+    await _prepareAndLoadH5Line(forceNew: true);
+  }
+
+  void _scheduleDomainExpiryTimer() {
+    _domainExpiryTimer?.cancel();
+
+    final now = DateTime.now();
+    final nextMidnight = DateTime(now.year, now.month, now.day + 1);
+    final delay = nextMidnight.difference(now) + const Duration(seconds: 1);
+    _domainExpiryTimer = Timer(
+      delay,
+      () => unawaited(_refreshExpiredH5LinesIfNeeded()),
+    );
   }
 
   Future<void> _clearInitialH5CachesIfNeeded() async {
@@ -319,17 +427,8 @@ class _H5ShellPageState extends State<H5ShellPage> {
   Future<void> _clearAllH5CachesInternal() async {
     await _clearNativeH5WebsiteData();
     await _clearCookiesSafely();
-
-    if (_lineSlots.isEmpty) {
-      final controller = WebViewController();
-      await _clearControllerStorage(controller);
-      return;
-    }
-
-    for (final slot in _lineSlots) {
-      await _clearPageStorage(slot.controller);
-      await _clearControllerStorage(slot.controller);
-    }
+    await _clearPageStorage(_lineSlot.controller);
+    await _clearControllerStorage(_lineSlot.controller);
   }
 
   Future<void> _clearNativeH5WebsiteData() async {
@@ -393,149 +492,10 @@ class _H5ShellPageState extends State<H5ShellPage> {
     } catch (_) {}
   }
 
-  Future<List<H5Line>> _fetchRuntimeH5Lines() async {
-    _logH5Lines('启动兜底线路', _h5Lines);
-    for (final uri in AppConfig.clientConfigQueryUris) {
-      try {
-        _logH5LineDebug(
-          '请求线路配置: $uri payload=${jsonEncode(AppConfig.clientConfigQueryPayload)}',
-        );
-        final lines = await _fetchRuntimeH5LinesFrom(uri);
-        if (lines.isNotEmpty) {
-          _logH5Lines('接口换算后的线路', lines);
-          return lines;
-        }
-        _logH5LineDebug('线路配置接口没有返回可用 resourceUrl: $uri');
-      } catch (error) {
-        _logH5LineDebug('线路配置请求失败: $uri error=$error');
-        // Try the next compatible endpoint shape.
-      }
-    }
-    _logH5LineDebug('没有获取到远程线路配置，将继续使用启动兜底线路');
-    return const [];
-  }
-
-  Future<List<H5Line>> _fetchRuntimeH5LinesFrom(Uri uri) async {
-    final client = HttpClient()..connectionTimeout = _lineProbeTimeout;
-    try {
-      final request = await client.postUrl(uri).timeout(_lineProbeTimeout);
-      request.headers.contentType = ContentType.json;
-      request.headers.set(HttpHeaders.acceptHeader, 'application/json');
-      request.headers.set('operationID', _createOperationID());
-      request.write(jsonEncode(AppConfig.clientConfigQueryPayload));
-
-      final response = await request.close().timeout(_lineProbeTimeout);
-      final body = await utf8.decoder.bind(response).join();
-      _logH5LineDebug(
-        '线路配置响应: $uri status=${response.statusCode} body=${_previewForLog(body)}',
-      );
-      if (response.statusCode < 200 || response.statusCode >= 300) {
-        return const [];
-      }
-
-      final decoded = jsonDecode(body);
-      final resourceUrl = _firstResourceUrlFromClientConfig(decoded);
-      if (resourceUrl == null || resourceUrl.trim().isEmpty) {
-        _logH5LineDebug('线路配置未找到 resourceUrl: $uri');
-        return const [];
-      }
-      _logH5LineDebug(
-        'resourceUrl 原始值: ${_escapeForLog(resourceUrl)}',
-      );
-      final resourceLines = AppConfig.splitResourceUrlLines(resourceUrl);
-      _logStringList('resourceUrl 拆分结果', resourceLines);
-      return AppConfig.h5LinesFromResourceUrl(resourceUrl);
-    } finally {
-      client.close(force: true);
-    }
-  }
-
-  String _createOperationID() =>
-      'flutter-h5-line-${DateTime.now().microsecondsSinceEpoch}';
-
-  String? _firstResourceUrlFromClientConfig(Object? decoded) {
-    if (decoded is! Map) {
-      return null;
-    }
-
-    final data = decoded['data'];
-    final entries = decoded['entries'] ??
-        (data is Map ? data['entries'] : null) ??
-        (data is List ? data : null);
-    if (entries is! List) {
-      return null;
-    }
-
-    for (final entry in entries) {
-      if (entry is! Map) {
-        continue;
-      }
-
-      final resourceType = entry['resourceType']?.toString().trim() ?? '';
-      final resourceUrl = entry['resourceUrl']?.toString();
-      if (resourceUrl == null || resourceUrl.trim().isEmpty) {
-        continue;
-      }
-      if (resourceType.isNotEmpty && resourceType != 'text') {
-        continue;
-      }
-      return resourceUrl;
-    }
-
-    return null;
-  }
-
-  Future<int?> _probeLinesUntilFirstAvailable() async {
-    final generation = ++_lineProbeGeneration;
-    for (var index = 0; index < _lineSlots.length; index += 1) {
-      if (!mounted || generation != _lineProbeGeneration) {
-        return null;
-      }
-
-      if (await _probeLineAndUpdate(index, generation: generation)) {
-        unawaited(_probeRemainingLines(index + 1, generation));
-        return index;
-      }
-    }
-    return null;
-  }
-
-  Future<void> _probeRemainingLines(int startIndex, int generation) async {
-    for (var index = startIndex; index < _lineSlots.length; index += 1) {
-      if (!mounted || generation != _lineProbeGeneration) {
-        return;
-      }
-      await _probeLineAndUpdate(index, generation: generation);
-    }
-  }
-
-  Future<void> _refreshAllLineAvailability() async {
-    final generation = ++_lineProbeGeneration;
-    if (mounted) {
-      setState(() {
-        for (final slot in _lineSlots) {
-          slot.availability = _LineAvailability.checking;
-        }
-      });
-    }
-
-    await Future.wait([
-      for (var index = 0; index < _lineSlots.length; index += 1)
-        _probeLineAndUpdate(index, generation: generation),
-    ]);
-  }
-
-  Future<bool> _probeLineAndUpdate(
-    int index, {
-    required int generation,
-  }) async {
-    if (index < 0 || index >= _lineSlots.length) {
-      return false;
-    }
-
-    final line = _lineSlots[index].line;
+  Future<bool> _probeCurrentLine() async {
+    final generation = _lineGeneration;
+    final line = _lineSlot.line;
     _setLineAvailability(
-      index,
       _LineAvailability.checking,
       generation: generation,
       line: line,
@@ -543,15 +503,12 @@ class _H5ShellPageState extends State<H5ShellPage> {
 
     final available = await _isLineReachable(line);
     if (!mounted ||
-        generation != _lineProbeGeneration ||
-        index < 0 ||
-        index >= _lineSlots.length ||
-        _lineSlots[index].line.url != line.url) {
+        generation != _lineGeneration ||
+        _lineSlot.line.url != line.url) {
       return false;
     }
 
     _setLineAvailability(
-      index,
       available ? _LineAvailability.available : _LineAvailability.unavailable,
       generation: generation,
       line: line,
@@ -580,131 +537,111 @@ class _H5ShellPageState extends State<H5ShellPage> {
   }
 
   void _setLineAvailability(
-    int index,
     _LineAvailability availability, {
     required int generation,
     required H5Line line,
   }) {
     if (!mounted ||
-        generation != _lineProbeGeneration ||
-        index < 0 ||
-        index >= _lineSlots.length ||
-        _lineSlots[index].line.url != line.url ||
-        _lineSlots[index].availability == availability) {
+        generation != _lineGeneration ||
+        _lineSlot.line.url != line.url ||
+        _lineSlot.availability == availability) {
       return;
     }
 
     setState(() {
-      _lineSlots[index].availability = availability;
+      _lineSlot.availability = availability;
     });
   }
 
-  void _replaceLineSlots(List<H5Line> lines) {
-    for (final slot in _lineSlots) {
-      slot.dispose();
+  void _replaceLineSlotIfNeeded(H5Line line) {
+    if (_h5Line.url == line.url) {
+      _logH5Line('WebView 使用的线路', _h5Line);
+      return;
     }
-    _lineProbeGeneration += 1;
-    _h5Lines = lines;
-    _lineSlots = _createLineSlots(lines);
-    _currentLineIndex = 0;
-    _isAutoSwitchingLine = false;
-    _logH5Lines('WebView 使用的线路', _h5Lines);
+
+    setState(() {
+      _replaceLineSlot(line);
+    });
   }
 
-  void _logH5Lines(String title, List<H5Line> lines) {
-    _logH5LineDebug('$title count=${lines.length}');
-    for (var index = 0; index < lines.length; index += 1) {
-      _logH5LineDebug(
-        '$title[${index + 1}] ${lines[index].label} => ${lines[index].url}',
-      );
-    }
+  void _replaceLineSlot(H5Line line) {
+    _lineSlot.dispose();
+    _lineGeneration += 1;
+    _h5Line = line;
+    _lineSlot = _createLineSlot(line);
+    _logH5Line('WebView 使用的线路', _h5Line);
   }
 
-  void _logStringList(String title, List<String> values) {
-    _logH5LineDebug('$title count=${values.length}');
-    for (var index = 0; index < values.length; index += 1) {
-      _logH5LineDebug('$title[${index + 1}] ${_escapeForLog(values[index])}');
-    }
+  void _logH5Line(String title, H5Line line) {
+    _logH5LineDebug('$title ${line.label} => ${line.url}');
   }
 
   void _logH5LineDebug(String message) {
     debugPrint('[H5LineDebug] $message');
   }
 
-  String _previewForLog(String value, {int maxLength = 1200}) {
-    final escaped = _escapeForLog(value);
-    if (escaped.length <= maxLength) {
-      return escaped;
-    }
-    return '${escaped.substring(0, maxLength)}...<${escaped.length} chars>';
+  bool _isCurrentLineGeneration(int generation) {
+    return generation == _lineGeneration;
   }
 
-  String _escapeForLog(String value) {
-    return value
-        .replaceAll('\r', r'\r')
-        .replaceAll('\n', r'\n')
-        .replaceAll('\t', r'\t');
-  }
-
-  bool _hasSameLineUrls(List<H5Line> left, List<H5Line> right) {
-    if (left.length != right.length) {
-      return false;
-    }
-
-    for (var index = 0; index < left.length; index += 1) {
-      if (left[index].url != right[index].url) {
-        return false;
-      }
-    }
-    return true;
-  }
-
-  Future<void> _runJavaScriptSafely(int lineIndex, String source) async {
+  Future<void> _runJavaScriptSafely(String source) async {
     try {
-      await _lineSlots[lineIndex].controller.runJavaScript(source);
+      await _lineSlot.controller.runJavaScript(source);
     } catch (_) {
       // WebView can reject JavaScript while a page is still navigating.
     }
   }
 
-  Future<void> _handlePageFinished(int lineIndex) async {
+  Future<void> _handlePageFinished(int generation) async {
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
     await _loadShellBrandingIfNeeded();
-    await _syncShellBranding(lineIndex);
-    await _installRouteObserver(lineIndex);
-    await _syncKeyboardState(lineIndex);
-    final slot = _lineSlots[lineIndex];
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
+    await _syncShellRequestUrl();
+    await _syncShellBranding();
+    await _syncKeyboardState();
+    final slot = _lineSlot;
     slot.availability = _LineAvailability.available;
     slot.progress = 100;
-    if (mounted &&
-        lineIndex == _currentLineIndex &&
-        slot.isAwaitingFirstScreen) {
+    if (mounted && slot.isAwaitingFirstScreen) {
       setState(() {});
     }
     if (slot.showShellCover) {
-      _scheduleShellCoverFallback(lineIndex);
+      _scheduleShellCoverFallback(generation);
     } else {
       slot.shellCoverFallbackTimer?.cancel();
     }
   }
 
-  void _handleShellMessage(int lineIndex, JavaScriptMessage message) {
+  void _handleShellMessage(int generation, JavaScriptMessage message) {
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
     try {
       final decoded = jsonDecode(message.message);
       if (decoded is Map && decoded['type'] == 'first-screen-ready') {
-        _hideShellCover(lineIndex);
-      } else if (decoded is Map && decoded['type'] == 'route-changed') {
-        _updateSlotUrl(lineIndex, decoded['url']?.toString());
+        _hideShellCover(generation);
       } else if (decoded is Map && decoded['type'] == 'keyboard-bridge-ready') {
-        unawaited(_syncKeyboardState(lineIndex));
+        unawaited(_syncKeyboardState());
       }
     } catch (_) {
       if (message.message == 'first-screen-ready') {
-        _hideShellCover(lineIndex);
+        _hideShellCover(generation);
       }
     }
   }
 
-  void _handleFlutterShellMessage(int lineIndex, JavaScriptMessage message) {
+  void _handleFlutterShellMessage(int generation, JavaScriptMessage message) {
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
     try {
       final decoded = jsonDecode(message.message);
       if (decoded is! Map) {
@@ -719,7 +656,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
           }
           unawaited(
             _handleShellMediaPermissionRequest(
-              lineIndex: lineIndex,
+              generation: generation,
               requestId: requestId,
               audio: decoded['audio'] == true,
               video: decoded['video'] == true,
@@ -728,15 +665,19 @@ class _H5ShellPageState extends State<H5ShellPage> {
         case 'openAppSettings':
           unawaited(openAppSettings());
         case 'keyboard-bridge-ready':
-          unawaited(_syncKeyboardState(lineIndex));
+          unawaited(_syncKeyboardState());
       }
     } catch (_) {
       // Ignore malformed shell messages from web content.
     }
   }
 
-  void _scheduleShellCoverFallback(int lineIndex) {
-    final slot = _lineSlots[lineIndex];
+  void _scheduleShellCoverFallback(int generation) {
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
+    final slot = _lineSlot;
     if (!slot.showShellCover) {
       return;
     }
@@ -744,12 +685,16 @@ class _H5ShellPageState extends State<H5ShellPage> {
     slot.shellCoverFallbackTimer?.cancel();
     slot.shellCoverFallbackTimer = Timer(
       const Duration(milliseconds: 1800),
-      () => _hideShellCover(lineIndex),
+      () => _hideShellCover(generation),
     );
   }
 
-  void _hideShellCover(int lineIndex) {
-    final slot = _lineSlots[lineIndex];
+  void _hideShellCover(int generation) {
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
+    final slot = _lineSlot;
     slot.shellCoverFallbackTimer?.cancel();
     if (slot.hasPresentedFirstScreen && !slot.showShellCover) {
       return;
@@ -758,7 +703,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     slot.hasPresentedFirstScreen = true;
     slot.progress = 100;
     slot.showShellCover = false;
-    if (!mounted || lineIndex != _currentLineIndex) {
+    if (!mounted) {
       return;
     }
 
@@ -782,7 +727,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     });
   }
 
-  Future<void> _syncShellBranding(int lineIndex) {
+  Future<void> _syncShellBranding() {
     final payload = jsonEncode({
       'name': _shellBranding.appName,
       'logo': _shellBranding.appLogo,
@@ -796,7 +741,22 @@ class _H5ShellPageState extends State<H5ShellPage> {
   } catch (_) {}
 })();
 ''';
-    return _runJavaScriptSafely(lineIndex, script);
+    return _runJavaScriptSafely(script);
+  }
+
+  Future<void> _syncShellRequestUrl() {
+    final url = AppConfig.originForUrl(_lineSlot.line.url);
+    final payload = jsonEncode({'url': url});
+    final script = '''
+(() => {
+  try {
+    const payload = $payload;
+    window.sessionStorage.setItem('OPENIM_FLUTTER_SHELL_REQUEST_URL', payload.url);
+    window.dispatchEvent(new CustomEvent('openim-shell-request-url-updated', { detail: payload }));
+  } catch (_) {}
+})();
+''';
+    return _runJavaScriptSafely(script);
   }
 
   void _scheduleKeyboardStateSync(double bottomInset) {
@@ -815,15 +775,11 @@ class _H5ShellPageState extends State<H5ShellPage> {
       if (!mounted || token != _keyboardSyncToken) {
         return;
       }
-      unawaited(_syncKeyboardState(_currentLineIndex));
+      unawaited(_syncKeyboardState());
     });
   }
 
-  Future<void> _syncKeyboardState(int lineIndex) {
-    if (lineIndex < 0 || lineIndex >= _lineSlots.length) {
-      return Future<void>.value();
-    }
-
+  Future<void> _syncKeyboardState() {
     final payload = jsonEncode({
       'height': _lastKeyboardInset.round(),
       'visible': _lastKeyboardVisible,
@@ -843,53 +799,11 @@ class _H5ShellPageState extends State<H5ShellPage> {
   } catch (_) {}
 })();
 ''';
-    return _runJavaScriptSafely(lineIndex, script);
-  }
-
-  Future<void> _installRouteObserver(int lineIndex) {
-    const script = '''
-(() => {
-  try {
-    const notify = () => {
-      try {
-        window.OpenIMShell.postMessage(JSON.stringify({
-          type: 'route-changed',
-          url: window.location.href
-        }));
-      } catch (_) {}
-    };
-
-    if (window.__OPENIM_FLUTTER_ROUTE_OBSERVER__) {
-      window.__OPENIM_FLUTTER_ROUTE_OBSERVER__.notify();
-      return;
-    }
-
-    const originalPushState = window.history.pushState;
-    const originalReplaceState = window.history.replaceState;
-
-    window.history.pushState = function() {
-      const result = originalPushState.apply(this, arguments);
-      notify();
-      return result;
-    };
-
-    window.history.replaceState = function() {
-      const result = originalReplaceState.apply(this, arguments);
-      notify();
-      return result;
-    };
-
-    window.addEventListener('popstate', notify);
-    window.__OPENIM_FLUTTER_ROUTE_OBSERVER__ = { notify };
-    notify();
-  } catch (_) {}
-})();
-''';
-    return _runJavaScriptSafely(lineIndex, script);
+    return _runJavaScriptSafely(script);
   }
 
   Future<void> _handleShellMediaPermissionRequest({
-    required int lineIndex,
+    required int generation,
     required String requestId,
     required bool audio,
     required bool video,
@@ -898,6 +812,10 @@ class _H5ShellPageState extends State<H5ShellPage> {
       audio: audio,
       video: video,
     );
+    if (!_isCurrentLineGeneration(generation)) {
+      return;
+    }
+
     final payload = jsonEncode({
       'requestId': requestId,
       'granted': result.granted,
@@ -911,7 +829,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
   } catch (_) {}
 })();
 ''';
-    await _runJavaScriptSafely(lineIndex, script);
+    await _runJavaScriptSafely(script);
   }
 
   Future<void> _handleWebViewPermissionRequest(
@@ -970,82 +888,43 @@ class _H5ShellPageState extends State<H5ShellPage> {
     );
   }
 
-  void _handleMainFrameLoadError(int lineIndex, String description) {
-    if (lineIndex < 0 || lineIndex >= _lineSlots.length) {
-      return;
-    }
-
-    final slot = _lineSlots[lineIndex];
+  void _handleMainFrameLoadError(String description) {
+    final slot = _lineSlot;
     slot.shellCoverFallbackTimer?.cancel();
     slot.availability = _LineAvailability.unavailable;
     slot.loadError = description;
     slot.showShellCover = false;
-    if (mounted && lineIndex == _currentLineIndex) {
+    if (mounted) {
       setState(() {});
-      unawaited(_switchToNextUsableLine(lineIndex));
+      unawaited(_replaceUnavailableLine());
     }
   }
 
-  Future<void> _switchToNextUsableLine(int failedIndex) async {
-    if (_isAutoSwitchingLine || _lineSlots.length <= 1) {
+  Future<void> _replaceUnavailableLine() async {
+    if (_isReplacingUnavailableLine) {
       return;
     }
 
-    _isAutoSwitchingLine = true;
+    _isReplacingUnavailableLine = true;
     try {
-      for (final index in _fallbackLineIndexes(failedIndex)) {
-        if (!mounted || failedIndex != _currentLineIndex) {
-          return;
-        }
-
-        final slot = _lineSlots[index];
-        if (slot.availability == _LineAvailability.unavailable) {
-          continue;
-        }
-
-        var available = slot.availability == _LineAvailability.available;
-        if (!available) {
-          final generation = _lineProbeGeneration;
-          available = await _probeLineAndUpdate(index, generation: generation);
-        }
-
-        if (available && mounted && failedIndex == _currentLineIndex) {
-          await _loadLine(index);
-          return;
-        }
+      await _clearAllH5Caches();
+      if (mounted) {
+        setState(() {
+          _isPreparingInitialLine = true;
+          _currentSlot.loadError = null;
+          _currentSlot.progress = 0;
+          _currentSlot.showShellCover = true;
+        });
       }
+      await _prepareAndLoadH5Line(forceNew: true);
     } finally {
-      _isAutoSwitchingLine = false;
+      _isReplacingUnavailableLine = false;
     }
   }
 
-  Iterable<int> _fallbackLineIndexes(int failedIndex) sync* {
-    for (var index = failedIndex + 1; index < _lineSlots.length; index += 1) {
-      yield index;
-    }
-    for (var index = 0; index < failedIndex; index += 1) {
-      yield index;
-    }
-  }
-
-  void _updateSlotUrl(int lineIndex, String? url) {
-    if (url == null || lineIndex < 0 || lineIndex >= _lineSlots.length) {
-      return;
-    }
-
-    final slot = _lineSlots[lineIndex];
-    final changed = slot.setCurrentUrl(url);
-    if (changed && mounted && lineIndex == _currentLineIndex) {
-      setState(() {});
-    }
-  }
-
-  Future<void> _loadLineHomeRequest(
-    int lineIndex, {
-    bool force = false,
-  }) async {
-    final slot = _lineSlots[lineIndex];
-    if (slot.hasLoadedInitialRequest && !force) {
+  Future<void> _loadCurrentLine({bool forceReload = false}) async {
+    final slot = _lineSlot;
+    if (slot.hasLoadedInitialRequest && !forceReload) {
       return;
     }
 
@@ -1054,7 +933,6 @@ class _H5ShellPageState extends State<H5ShellPage> {
     if (mounted) {
       slot.shellCoverFallbackTimer?.cancel();
       setState(() {
-        slot.setCurrentUrl(slot.line.url);
         slot.loadError = null;
         slot.progress = 0;
         slot.showShellCover = shouldShowCover;
@@ -1062,10 +940,17 @@ class _H5ShellPageState extends State<H5ShellPage> {
     }
 
     await slot.controller.loadRequest(Uri.parse(slot.line.url));
+    await _syncKeyboardState();
   }
 
   Future<void> _reloadCurrentLine() async {
     final slot = _currentSlot;
+    if (slot.availability == _LineAvailability.unavailable ||
+        slot.loadError != null) {
+      await _replaceUnavailableLine();
+      return;
+    }
+
     final shouldShowCover = !slot.hasPresentedFirstScreen;
     slot.shellCoverFallbackTimer?.cancel();
     if (mounted) {
@@ -1079,33 +964,17 @@ class _H5ShellPageState extends State<H5ShellPage> {
     if (slot.hasLoadedInitialRequest) {
       await slot.controller.reload();
     } else {
-      await _loadLineHomeRequest(_currentLineIndex);
+      await _loadCurrentLine();
     }
   }
 
-  Future<void> _loadLine(int index, {bool forceReload = false}) async {
-    final safeIndex = index < 0 || index >= _h5Lines.length ? 0 : index;
-    if (_lineSlots[safeIndex].availability == _LineAvailability.unavailable) {
-      return;
-    }
-
-    if (mounted) {
-      setState(() {
-        _currentLineIndex = safeIndex;
-      });
-    }
-
-    await _loadLineHomeRequest(safeIndex, force: forceReload);
-    await _syncKeyboardState(safeIndex);
-  }
-
-  Widget _buildWebViewWidget(int index) {
+  Widget _buildWebViewWidget() {
     PlatformWebViewWidgetCreationParams params =
         PlatformWebViewWidgetCreationParams(
-      controller: _lineSlots[index].controller.platform,
+      controller: _lineSlot.controller.platform,
     );
 
-    if (_lineSlots[index].controller.platform is AndroidWebViewController) {
+    if (_lineSlot.controller.platform is AndroidWebViewController) {
       params = AndroidWebViewWidgetCreationParams
           .fromPlatformWebViewWidgetCreationParams(
         params,
@@ -1115,44 +984,12 @@ class _H5ShellPageState extends State<H5ShellPage> {
 
     return RepaintBoundary(
       child: WebViewWidget.fromPlatformCreationParams(
-        key: ValueKey<int>(index),
+        key: ValueKey<String>(_lineSlot.line.url),
         params: params,
       ),
     );
   }
 
-  Future<void> _showLineSwitcher() async {
-    await _clearAllH5Caches();
-    await _refreshAllLineAvailability();
-    if (!mounted) {
-      return;
-    }
-
-    showModalBottomSheet<void>(
-      context: context,
-      useSafeArea: true,
-      showDragHandle: true,
-      backgroundColor: Colors.white,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
-      ),
-      builder: (sheetContext) {
-        return _LineSwitcherSheet(
-          lines: _h5Lines,
-          slots: _lineSlots,
-          currentIndex: _currentLineIndex,
-          onSelect: (index) {
-            if (_lineSlots[index].availability != _LineAvailability.available) {
-              return;
-            }
-            Navigator.of(sheetContext).pop();
-            unawaited(_loadLine(index, forceReload: true));
-          },
-        );
-      },
-    );
-  }
-
   Future<NavigationDecision> _handleNavigationRequest(
     NavigationRequest request,
   ) async {
@@ -1190,11 +1027,6 @@ class _H5ShellPageState extends State<H5ShellPage> {
     final topInset = MediaQuery.paddingOf(context).top;
     final bottomInset = MediaQuery.viewInsetsOf(context).bottom;
     _scheduleKeyboardStateSync(bottomInset);
-    final showLineSwitch = !_isPreparingInitialLine &&
-        !currentSlot.showShellCover &&
-        currentSlot.loadError == null &&
-        currentSlot.isLoginPage &&
-        bottomInset == 0;
     final shouldPaintShellFallback =
         (_isPreparingInitialLine || currentSlot.isAwaitingFirstScreen) &&
             currentSlot.loadError == null;
@@ -1219,15 +1051,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
                       child: _ShellFallback(progress: currentSlot.progress),
                     ),
                   Positioned.fill(
-                    child: IndexedStack(
-                      index: _currentLineIndex,
-                      children: [
-                        for (var index = 0;
-                            index < _lineSlots.length;
-                            index += 1)
-                          _buildWebViewWidget(index),
-                      ],
-                    ),
+                    child: _buildWebViewWidget(),
                   ),
                   if (currentSlot.showShellCover &&
                       !currentSlot.hasPresentedFirstScreen)
@@ -1250,16 +1074,6 @@ class _H5ShellPageState extends State<H5ShellPage> {
                       message: currentSlot.loadError!,
                       onRetry: () => unawaited(_reloadCurrentLine()),
                     ),
-                  if (showLineSwitch)
-                    Positioned(
-                      left: 20,
-                      right: 20,
-                      bottom: MediaQuery.paddingOf(context).bottom + 14,
-                      child: _LineSwitchBar(
-                        currentLine: _currentLine,
-                        onSwitch: () => unawaited(_showLineSwitcher()),
-                      ),
-                    ),
                 ],
               ),
             ),
@@ -1307,23 +1121,10 @@ class _H5LineWebViewSlot {
   bool showShellCover = true;
   bool hasPresentedFirstScreen = false;
   bool hasLoadedInitialRequest = false;
-  bool isLoginPage = false;
-  String? currentUrl;
   Timer? shellCoverFallbackTimer;
 
   bool get isAwaitingFirstScreen => !hasPresentedFirstScreen;
 
-  bool setCurrentUrl(String url) {
-    final nextIsLoginPage = AppConfig.isLoginPageUrl(url);
-    if (currentUrl == url && isLoginPage == nextIsLoginPage) {
-      return false;
-    }
-
-    currentUrl = url;
-    isLoginPage = nextIsLoginPage;
-    return true;
-  }
-
   void dispose() {
     shellCoverFallbackTimer?.cancel();
   }
@@ -1370,238 +1171,6 @@ class _ErrorPanel extends StatelessWidget {
   }
 }
 
-class _LineSwitchBar extends StatelessWidget {
-  const _LineSwitchBar({
-    required this.currentLine,
-    required this.onSwitch,
-  });
-
-  final H5Line currentLine;
-  final VoidCallback onSwitch;
-
-  @override
-  Widget build(BuildContext context) {
-    return Center(
-      child: ConstrainedBox(
-        constraints: const BoxConstraints(maxWidth: 560),
-        child: SizedBox(
-          width: double.infinity,
-          child: Material(
-            color: Colors.white.withValues(alpha: 0.94),
-            elevation: 8,
-            shadowColor: const Color(0xFF0F4C81).withValues(alpha: 0.12),
-            borderRadius: BorderRadius.circular(32),
-            child: InkWell(
-              onTap: onSwitch,
-              borderRadius: BorderRadius.circular(32),
-              child: Container(
-                height: 64,
-                padding: const EdgeInsets.symmetric(horizontal: 18),
-                decoration: BoxDecoration(
-                  borderRadius: BorderRadius.circular(32),
-                  border: Border.all(color: const Color(0xFFE1EAF5)),
-                ),
-                child: Row(
-                  mainAxisAlignment: MainAxisAlignment.center,
-                  children: [
-                    const Icon(
-                      Icons.sync_rounded,
-                      size: 19,
-                      color: _shellSubText,
-                    ),
-                    const SizedBox(width: 8),
-                    const Text(
-                      '当前: ',
-                      style: TextStyle(
-                        color: _shellSubText,
-                        fontSize: 15,
-                        height: 1.2,
-                        fontWeight: FontWeight.w600,
-                        letterSpacing: 0,
-                      ),
-                    ),
-                    Flexible(
-                      child: Text(
-                        currentLine.label,
-                        overflow: TextOverflow.ellipsis,
-                        style: const TextStyle(
-                          color: Color(0xFF17233D),
-                          fontSize: 16,
-                          height: 1.2,
-                          fontWeight: FontWeight.w700,
-                          letterSpacing: 0,
-                        ),
-                      ),
-                    ),
-                    const SizedBox(width: 12),
-                    const Text(
-                      '切换',
-                      style: TextStyle(
-                        color: _shellAccent,
-                        fontSize: 15,
-                        height: 1.2,
-                        fontWeight: FontWeight.w700,
-                        letterSpacing: 0,
-                      ),
-                    ),
-                  ],
-                ),
-              ),
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _LineSwitcherSheet extends StatelessWidget {
-  const _LineSwitcherSheet({
-    required this.lines,
-    required this.slots,
-    required this.currentIndex,
-    required this.onSelect,
-  });
-
-  final List<H5Line> lines;
-  final List<_H5LineWebViewSlot> slots;
-  final int currentIndex;
-  final ValueChanged<int> onSelect;
-
-  @override
-  Widget build(BuildContext context) {
-    final sheetHeight = MediaQuery.sizeOf(context).height * 0.58;
-    final maxHeight = sheetHeight > 420 ? 420.0 : sheetHeight;
-
-    return Padding(
-      padding: const EdgeInsets.fromLTRB(20, 0, 20, 16),
-      child: Column(
-        mainAxisSize: MainAxisSize.min,
-        crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
-          const Text(
-            '切换线路',
-            style: TextStyle(
-              color: Color(0xFF17233D),
-              fontSize: 18,
-              height: 1.2,
-              fontWeight: FontWeight.w700,
-              letterSpacing: 0,
-            ),
-          ),
-          const SizedBox(height: 14),
-          ConstrainedBox(
-            constraints: BoxConstraints(maxHeight: maxHeight),
-            child: ListView.separated(
-              shrinkWrap: true,
-              itemCount: lines.length,
-              separatorBuilder: (context, index) => const SizedBox(height: 10),
-              itemBuilder: (context, index) {
-                final line = lines[index];
-                final availability = slots[index].availability;
-                final selected = index == currentIndex;
-
-                return _LineOptionTile(
-                  line: line,
-                  availability: availability,
-                  selected: selected,
-                  onTap: () => onSelect(index),
-                );
-              },
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}
-
-class _LineOptionTile extends StatelessWidget {
-  const _LineOptionTile({
-    required this.line,
-    required this.availability,
-    required this.selected,
-    required this.onTap,
-  });
-
-  final H5Line line;
-  final _LineAvailability availability;
-  final bool selected;
-  final VoidCallback onTap;
-
-  @override
-  Widget build(BuildContext context) {
-    final enabled = availability == _LineAvailability.available;
-    final foregroundColor = enabled ? const Color(0xFF17233D) : _shellSubText;
-    final borderColor = selected && enabled
-        ? _shellAccent
-        : enabled
-            ? const Color(0xFFE1EAF5)
-            : const Color(0xFFE4E8EE);
-
-    return Material(
-      color: selected && enabled
-          ? const Color(0xFFEFF7FF)
-          : enabled
-              ? Colors.white
-              : const Color(0xFFF4F6F9),
-      borderRadius: BorderRadius.circular(8),
-      child: InkWell(
-        onTap: enabled ? onTap : null,
-        borderRadius: BorderRadius.circular(8),
-        child: Container(
-          constraints: const BoxConstraints(minHeight: 58),
-          padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
-          decoration: BoxDecoration(
-            borderRadius: BorderRadius.circular(8),
-            border: Border.all(
-              color: borderColor,
-            ),
-          ),
-          child: Row(
-            children: [
-              Icon(
-                selected
-                    ? Icons.radio_button_checked_rounded
-                    : Icons.radio_button_unchecked_rounded,
-                color: selected && enabled ? _shellAccent : _shellSubText,
-                size: 22,
-              ),
-              const SizedBox(width: 12),
-              Expanded(
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  mainAxisAlignment: MainAxisAlignment.center,
-                  children: [
-                    Text(
-                      line.label,
-                      maxLines: 1,
-                      overflow: TextOverflow.ellipsis,
-                      style: TextStyle(
-                        color: foregroundColor,
-                        fontSize: 16,
-                        height: 1.2,
-                        fontWeight: FontWeight.w700,
-                        letterSpacing: 0,
-                      ),
-                    ),
-                  ],
-                ),
-              ),
-              const SizedBox(width: 8),
-              Icon(
-                Icons.chevron_right_rounded,
-                color: enabled ? _shellSubText : const Color(0xFFC1CBD8),
-                size: 22,
-              ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-}
-
 class _ShellFallback extends StatelessWidget {
   const _ShellFallback({required this.progress});
 
diff --git a/test/widget_test.dart b/test/widget_test.dart
index 2570572..145afce 100644
--- a/test/widget_test.dart
+++ b/test/widget_test.dart
@@ -11,125 +11,58 @@ void main() {
     );
   });
 
-  test('exposes bootstrap H5 URL as Flutter shell lines', () {
-    final lines = AppConfig.h5Lines;
+  test('creates one wildcard H5 line with a numeric 16 digit label', () {
+    final line = AppConfig.h5Line;
 
-    expect(lines, isNotEmpty);
-    expect(lines.first.label, '线路1');
-    expect(Uri.parse(lines.first.url).scheme, 'https');
-    expect(Uri.parse(lines.first.url).path, '/');
-  });
-
-  test('uses current non-local service origin as default H5 line', () {
-    final urls = AppConfig.defaultH5LineUrlsForBaseUri(
-      Uri.parse('https://app.example.com/shell/index.html?from=local#hash'),
-    );
-
-    expect(urls, ['https://app.example.com/']);
-  });
-
-  test('preserves current service port when building default H5 line', () {
-    final urls = AppConfig.defaultH5LineUrlsForBaseUri(
-      Uri.parse('https://chat.example.com:8443/app/'),
-    );
-
-    expect(urls, ['https://chat.example.com:8443/']);
-  });
-
-  test('keeps fixed bootstrap H5 line for local browser access', () {
-    final urls = AppConfig.defaultH5LineUrlsForBaseUri(
-      Uri.parse('http://localhost:3000/'),
-    );
-
-    expect(urls, ['https://h5-test.imharry.work/']);
-  });
-
-  test('keeps fixed bootstrap H5 line for loopback browser access', () {
-    final urls = AppConfig.defaultH5LineUrlsForBaseUri(
-      Uri.parse('http://127.0.0.1:3000/'),
-    );
-
-    expect(urls, ['https://h5-test.imharry.work/']);
-  });
-
-  test('keeps fixed bootstrap H5 line for native app access', () {
-    final urls = AppConfig.defaultH5LineUrlsForBaseUri(
-      Uri.parse('file:///android_asset/flutter_assets/'),
-    );
-
-    expect(urls, ['https://h5-test.imharry.work/']);
-  });
-
-  test('uses fixed client config query parameters', () {
-    expect(AppConfig.clientConfigQueryPayload, {
-      'device': 'h5',
-      'serialNo': 'h5-domain',
-    });
+    expect(line.label, '线路1');
     expect(
-      AppConfig.clientConfigQueryUris.first.path,
-      '/client_config/query',
+      line.uri.host,
+      matches(RegExp(r'^[1-9][0-9]{15}\.(albzyuxq|zdyswvnt|gxifpxcr)\.vip$')),
     );
   });
 
-  test('builds client config query APIs from current service origin', () {
-    final uris = AppConfig.clientConfigQueryUrisForHomeUri(
-      Uri.parse('https://app.example.com/app/index.html?from=local#hash'),
-    );
+  test('generates the next single URL from the configured fallback order', () {
+    var index = 0;
+    const labels = [
+      '1234567890123456',
+      '2234567890123456',
+      '3234567890123456',
+    ];
+    final first = AppConfig.createRandomH5Line(
+        attempt: 0, wildcardFactory: () => labels[index++]);
+    final second = AppConfig.createRandomH5Line(
+        attempt: 1, wildcardFactory: () => labels[index++]);
+    final third = AppConfig.createRandomH5Line(
+        attempt: 2, wildcardFactory: () => labels[index++]);
 
+    expect(first.uri.host, '1234567890123456.albzyuxq.vip');
+    expect(second.uri.host, '2234567890123456.zdyswvnt.vip');
+    expect(third.uri.host, '3234567890123456.gxifpxcr.vip');
+  });
+
+  test('passes Flutter shell request URL to H5 through query parameters', () {
+    final line = AppConfig.createRandomH5Line(
+      wildcardFactory: () => '1234567890123456',
+    );
+    final uri = line.uri;
+
+    expect(uri.queryParameters[AppConfig.flutterShellMarkerQueryKey], '1');
     expect(
-      uris.map((uri) => uri.toString()),
-      [
-        'https://app.example.com/client_config/query',
-        'https://app.example.com/api/user/client_config/query',
-      ],
+      uri.queryParameters[AppConfig.flutterShellUrlQueryKey],
+      'https://1234567890123456.albzyuxq.vip',
+    );
+    expect(
+      AppConfig.originForUrl(line.url),
+      'https://1234567890123456.albzyuxq.vip',
     );
   });
 
-  test('splits client config resourceUrl into indexed H5 lines', () {
-    final lines = AppConfig.h5LinesFromResourceUrl(
-      'line-one.example\nhttps://line-two.example/app\n\nline-three.example',
+  test('restores a cached H5 line URL with the single line label', () {
+    final line = AppConfig.h5LineFromUrl(
+      'https://1234567890123456.albzyuxq.vip/?flutter_shell=1',
     );
 
-    expect(lines.map((line) => line.label), ['线路1', '线路2', '线路3']);
-    expect(Uri.parse(lines[0].url).host, 'line-one.example');
-    expect(Uri.parse(lines[1].url).host, 'line-two.example');
-    expect(Uri.parse(lines[1].url).path, '/app');
-    expect(Uri.parse(lines[2].url).host, 'line-three.example');
-  });
-
-  test('splits literal backslash-n resourceUrl values', () {
-    final lines = AppConfig.h5LinesFromResourceUrl(
-      r'line-one.example\n*.line-two.example\nline-three.example',
-      wildcardFactory: () => 'abcdefghijklmnop',
-    );
-
-    expect(lines.map((line) => line.label), ['线路1', '线路2', '线路3']);
-    expect(Uri.parse(lines[0].url).host, 'line-one.example');
-    expect(Uri.parse(lines[1].url).host, 'abcdefghijklmnop.line-two.example');
-    expect(Uri.parse(lines[2].url).host, 'line-three.example');
-  });
-
-  test('expands wildcard H5 domains with a 16 character label', () {
-    final lines = AppConfig.h5LinesFromResourceUrl(
-      '*.albzyuxq.vip',
-      wildcardFactory: () => 'abcdefghijklmnop',
-    );
-
-    final host = Uri.parse(lines.single.url).host;
-    expect(host, 'abcdefghijklmnop.albzyuxq.vip');
-    expect(host.split('.').first.length, 16);
-  });
-
-  test('detects only H5 login routes for shell line switch display', () {
-    expect(AppConfig.isLoginPageUrl('https://line-one.example/login'), isTrue);
-    expect(
-        AppConfig.isLoginPageUrl('https://line-one.example/app/login'), isTrue);
-    expect(
-        AppConfig.isLoginPageUrl('https://line-one.example/#/login'), isTrue);
-    expect(AppConfig.isLoginPageUrl('https://line-one.example/'), isFalse);
-    expect(
-        AppConfig.isLoginPageUrl('https://line-one.example/contact'), isFalse);
-    expect(
-        AppConfig.isLoginPageUrl('https://line-one.example/getCode'), isFalse);
+    expect(line.label, '线路1');
+    expect(line.uri.host, '1234567890123456.albzyuxq.vip');
   });
 }