diff --git a/lib/config/app_config.dart b/lib/config/app_config.dart
index 8f591ea..f53a421 100644
--- a/lib/config/app_config.dart
+++ b/lib/config/app_config.dart
@@ -83,6 +83,19 @@ class AppConfig {
     return url;
   }
 
+  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 int? lineIndexForUrl(String url) {
     final uri = Uri.tryParse(url);
     if (uri == null) {
@@ -123,6 +136,21 @@ class AppConfig {
     return index;
   }
 
+  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 bool _isSameLine(Uri lineUri, Uri uri) {
     if (lineUri.host.toLowerCase() != uri.host.toLowerCase()) {
       return false;
diff --git a/lib/main.dart b/lib/main.dart
index f96f9e2..7890c3a 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -133,11 +133,12 @@ class _H5ShellPageState extends State<H5ShellPage> {
               setState(() => _lineSlots[lineIndex].progress = progress);
             }
           },
-          onPageStarted: (_) {
+          onPageStarted: (url) {
             final slot = _lineSlots[lineIndex];
             slot.shellCoverFallbackTimer?.cancel();
             if (mounted) {
               setState(() {
+                slot.setCurrentUrl(url);
                 slot.loadError = null;
                 slot.progress = 0;
                 slot.showShellCover = true;
@@ -147,6 +148,9 @@ class _H5ShellPageState extends State<H5ShellPage> {
           onPageFinished: (_) {
             unawaited(_handlePageFinished(lineIndex));
           },
+          onUrlChange: (change) {
+            _updateSlotUrl(lineIndex, change.url);
+          },
           onWebResourceError: (error) {
             if (error.isForMainFrame ?? true) {
               final slot = _lineSlots[lineIndex];
@@ -183,6 +187,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
   Future<void> _handlePageFinished(int lineIndex) async {
     await _loadShellBrandingIfNeeded();
     await _syncShellBranding(lineIndex);
+    await _installRouteObserver(lineIndex);
     if (mounted) {
       setState(() {
         _lineSlots[lineIndex].progress = 100;
@@ -196,6 +201,8 @@ class _H5ShellPageState extends State<H5ShellPage> {
       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());
       }
     } catch (_) {
       if (message.message == 'first-screen-ready') {
@@ -260,6 +267,60 @@ class _H5ShellPageState extends State<H5ShellPage> {
     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);
+  }
+
+  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) {
+      setState(() {});
+    }
+  }
+
   Future<void> _ensureLineLoaded(int lineIndex) async {
     final slot = _lineSlots[lineIndex];
     if (slot.hasLoadedInitialRequest) {
@@ -270,6 +331,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     if (mounted) {
       slot.shellCoverFallbackTimer?.cancel();
       setState(() {
+        slot.setCurrentUrl(slot.line.url);
         slot.loadError = null;
         slot.progress = 0;
         slot.showShellCover = true;
@@ -369,6 +431,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     final bottomInset = MediaQuery.viewInsetsOf(context).bottom;
     final showLineSwitch = !currentSlot.showShellCover &&
         currentSlot.loadError == null &&
+        currentSlot.isLoginPage &&
         bottomInset == 0;
 
     return PopScope(
@@ -448,8 +511,21 @@ class _H5LineWebViewSlot {
   String? loadError;
   bool showShellCover = true;
   bool hasLoadedInitialRequest = false;
+  bool isLoginPage = false;
+  String? currentUrl;
   Timer? shellCoverFallbackTimer;
 
+  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();
   }
diff --git a/test/widget_test.dart b/test/widget_test.dart
index c44fdbf..0914530 100644
--- a/test/widget_test.dart
+++ b/test/widget_test.dart
@@ -50,6 +50,20 @@ void main() {
     expect(AppConfig.lineIndexForUrl('${lineUrl}login'), 0);
   });
 
+  test('detects only H5 login routes for shell line switch display', () {
+    expect(
+        AppConfig.isLoginPageUrl('https://h5-test.imharry.work/login'), isTrue);
+    expect(AppConfig.isLoginPageUrl('https://h5-test.imharry.work/app/login'),
+        isTrue);
+    expect(AppConfig.isLoginPageUrl('https://h5-test.imharry.work/#/login'),
+        isTrue);
+    expect(AppConfig.isLoginPageUrl('https://h5-test.imharry.work/'), isFalse);
+    expect(AppConfig.isLoginPageUrl('https://h5-test.imharry.work/contact'),
+        isFalse);
+    expect(AppConfig.isLoginPageUrl('https://h5-test.imharry.work/getCode'),
+        isFalse);
+  });
+
   test('refreshes an H5 route URL without adding branding to the URL', () {
     final uri = Uri.parse(
       AppConfig.withFreshShellParams(