diff --git a/lib/pages/player/widgets/comment_composer_sheet.dart b/lib/pages/player/widgets/comment_composer_sheet.dart
new file mode 100644
index 0000000..7ef0c89
--- /dev/null
+++ b/lib/pages/player/widgets/comment_composer_sheet.dart
@@ -0,0 +1,294 @@
+// Author: fruit.com.cn
+
+import 'dart:async';
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../../../core/data/models/comment.dart';
+import '../../../core/data/services/auth_controller.dart';
+import '../../../core/data/services/comment_controller.dart';
+import '../../../core/platform/haptics.dart';
+import '../../../core/platform/keyboard_inset.dart';
+import '../../../core/theme/app_colors.dart';
+import '../../../core/widgets/auth_gate.dart';
+import '../../../l10n/app_localizations.dart';
+
+const double _sheetRadius = 20;
+const double _inputRadius = 12;
+const double _postButtonHeight = 32;
+const int _maxCommentLength = 300;
+
+/// 独立评论输入弹窗，复用原评论控制器的发布与列表更新能力。
+class CommentComposerSheet extends StatefulWidget {
+  const CommentComposerSheet({
+    super.key,
+    required this.controller,
+    this.replyTo,
+  });
+
+  final CommentController controller;
+  final DramaComment? replyTo;
+
+  @override
+  State<CommentComposerSheet> createState() => _CommentComposerSheetState();
+}
+
+class _CommentComposerSheetState extends State<CommentComposerSheet>
+    with WidgetsBindingObserver {
+  final _input = TextEditingController();
+  final _inputFocus = FocusNode();
+  final _keyboardInset = KeyboardInsetNotifier.instance;
+  bool _keyboardWasVisible = false;
+  bool _hadFocus = false;
+  bool _closing = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addObserver(this);
+    _input.addListener(_onInputChanged);
+    _inputFocus.addListener(_onFocusChanged);
+    _keyboardInset.addListener(_onKeyboardInsetChanged);
+    widget.controller.addListener(_onControllerChanged);
+    unawaited(_keyboardInset.start());
+  }
+
+  @override
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+    _input.removeListener(_onInputChanged);
+    _inputFocus.removeListener(_onFocusChanged);
+    _keyboardInset.removeListener(_onKeyboardInsetChanged);
+    widget.controller.removeListener(_onControllerChanged);
+    _input.dispose();
+    _inputFocus.dispose();
+    super.dispose();
+  }
+
+  void _onInputChanged() {
+    if (mounted) setState(() {});
+  }
+
+  void _onControllerChanged() {
+    if (mounted) setState(() {});
+  }
+
+  void _onFocusChanged() {
+    if (!mounted) return;
+    final hasFocus = _inputFocus.hasFocus;
+    if (_hadFocus && !hasFocus) {
+      _closeSheet();
+    }
+    _hadFocus = hasFocus;
+    setState(() {});
+  }
+
+  void _onKeyboardInsetChanged() {
+    if (!mounted) return;
+    setState(() {});
+    _syncKeyboardVisibility(_keyboardHeight(context));
+  }
+
+  @override
+  void didChangeMetrics() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (!mounted) return;
+      _syncKeyboardVisibility(_keyboardHeight(context));
+    });
+  }
+
+  void _syncKeyboardVisibility(double keyboardHeight) {
+    if (keyboardHeight > 0) {
+      _keyboardWasVisible = true;
+      return;
+    }
+    if (_keyboardWasVisible) _closeSheet();
+  }
+
+  double _keyboardHeight(BuildContext context) => math.max(
+    MediaQuery.viewInsetsOf(context).bottom,
+    _keyboardInset.value / MediaQuery.devicePixelRatioOf(context),
+  );
+
+  void _closeSheet() {
+    if (_closing || !mounted) return;
+    _closing = true;
+    Navigator.pop(context);
+  }
+
+  Future<void> _submit() async {
+    if (widget.controller.submitting) return;
+    final text = _input.text.trim();
+    if (text.isEmpty) return;
+    unawaited(context.read<Haptics>().lightImpact());
+    final result = await widget.controller.publish(
+      text,
+      replyTo: widget.replyTo,
+    );
+    if (!mounted) return;
+    if (result.isSuccess) {
+      _closing = true;
+      Navigator.pop(context, true);
+      return;
+    }
+    final l10n = AppLocalizations.of(context)!;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(result.errorMessage ?? l10n.commentPostFailed)),
+    );
+  }
+
+  Future<void> _authenticate() async {
+    await ensureSignedIn(context);
+    if (!mounted || !context.read<AuthController>().isSignedIn) return;
+    _inputFocus.requestFocus();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final screenHeight = MediaQuery.sizeOf(context).height;
+    final halfHeight = (screenHeight * 0.5).roundToDouble();
+    final maxHeight = math.max(
+      0.0,
+      screenHeight - MediaQuery.paddingOf(context).top,
+    );
+    final sheetHeight = math.min(halfHeight, maxHeight);
+    final keyboardHeight = _keyboardHeight(context);
+    final l10n = AppLocalizations.of(context)!;
+    final signedIn = context.watch<AuthController>().isSignedIn;
+    final hasContent = _input.text.trim().isNotEmpty;
+    final canPost = signedIn && hasContent && !widget.controller.submitting;
+    final multiline = _input.text.contains('\n');
+
+    return AnimatedPadding(
+      duration: const Duration(milliseconds: 200),
+      curve: Curves.easeOut,
+      padding: EdgeInsets.only(bottom: keyboardHeight),
+      child: SizedBox(
+        key: const Key('comment-composer-sheet'),
+        height: sheetHeight,
+        child: Material(
+          color: AppColors.card,
+          clipBehavior: Clip.antiAlias,
+          borderRadius: const BorderRadius.vertical(
+            top: Radius.circular(_sheetRadius),
+          ),
+          child: SafeArea(
+            top: false,
+            child: Padding(
+              padding: const EdgeInsets.fromLTRB(16, 16, 16, 12),
+              child: TextFieldTapRegion(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  children: [
+                    if (widget.replyTo != null)
+                      Padding(
+                        padding: const EdgeInsets.only(bottom: 8),
+                        child: Text(
+                          l10n.replyingTo(
+                            widget.replyTo!.nickname.isEmpty
+                                ? l10n.anonymousUser
+                                : widget.replyTo!.nickname,
+                          ),
+                          style: const TextStyle(
+                            color: AppColors.muted,
+                            fontSize: 12,
+                          ),
+                        ),
+                      ),
+                    Expanded(
+                      child: Align(
+                        alignment: Alignment.topCenter,
+                        child: Container(
+                          decoration: BoxDecoration(
+                            color: AppColors.commentInput,
+                            borderRadius: BorderRadius.circular(_inputRadius),
+                          ),
+                          child: TextField(
+                            key: const Key('comment-composer-input'),
+                            autofocus: true,
+                            controller: _input,
+                            focusNode: _inputFocus,
+                            readOnly: !signedIn,
+                            canRequestFocus: signedIn,
+                            minLines: 1,
+                            maxLines: 4,
+                            maxLength: _maxCommentLength,
+                            textAlignVertical: multiline
+                                ? TextAlignVertical.top
+                                : TextAlignVertical.center,
+                            style: TextStyle(
+                              color: AppColors.cream,
+                              fontSize: 15,
+                              height: multiline ? 1.4 : null,
+                            ),
+                            cursorColor: AppColors.blue,
+                            decoration: InputDecoration(
+                              hintText: signedIn
+                                  ? l10n.writeComment
+                                  : l10n.commentLoginHint,
+                              hintStyle: const TextStyle(
+                                color: AppColors.muted,
+                                fontSize: 14,
+                              ),
+                              counterText: '',
+                              contentPadding: const EdgeInsets.symmetric(
+                                horizontal: 16,
+                                vertical: 12,
+                              ),
+                              border: InputBorder.none,
+                              enabledBorder: InputBorder.none,
+                              focusedBorder: InputBorder.none,
+                            ),
+                            onTap: signedIn ? null : _authenticate,
+                            onTapOutside: (_) {
+                              _inputFocus.unfocus();
+                              _closeSheet();
+                            },
+                          ),
+                        ),
+                      ),
+                    ),
+                    const SizedBox(height: 12),
+                    Align(
+                      alignment: Alignment.centerRight,
+                      child: SizedBox(
+                        height: _postButtonHeight,
+                        child: TextButton(
+                          key: const Key('comment-composer-post'),
+                          onPressed: canPost ? _submit : null,
+                          style: TextButton.styleFrom(
+                            minimumSize: const Size(0, _postButtonHeight),
+                            padding: const EdgeInsets.symmetric(horizontal: 16),
+                            tapTargetSize: MaterialTapTargetSize.shrinkWrap,
+                            backgroundColor: hasContent
+                                ? AppColors.blue.withValues(alpha: 0.12)
+                                : AppColors.raised,
+                            foregroundColor: AppColors.blue,
+                            disabledForegroundColor: AppColors.muted,
+                            disabledBackgroundColor: AppColors.raised,
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(8),
+                            ),
+                          ),
+                          child: Text(
+                            l10n.postComment,
+                            style: const TextStyle(
+                              fontSize: 14,
+                              fontWeight: FontWeight.w600,
+                            ),
+                          ),
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/pages/player/widgets/drama_comments_sheet.dart b/lib/pages/player/widgets/drama_comments_sheet.dart
index cc206e7..683702b 100644
--- a/lib/pages/player/widgets/drama_comments_sheet.dart
+++ b/lib/pages/player/widgets/drama_comments_sheet.dart
@@ -10,18 +10,16 @@ import '../../../core/data/models/comment.dart';
 import '../../../core/data/models/drama.dart';
 import '../../../core/data/repositories/comment_repository.dart';
 import '../../../core/data/repositories/interaction_repository.dart';
-import '../../../core/data/services/comment_controller.dart';
 import '../../../core/data/services/auth_controller.dart';
+import '../../../core/data/services/comment_controller.dart';
 import '../../../core/formatting/error_text.dart';
-import '../../../core/platform/haptics.dart';
-import '../../../core/platform/keyboard_inset.dart';
 import '../../../core/theme/app_colors.dart';
 import '../../../core/widgets/auth_gate.dart';
 import '../../../core/widgets/empty_state.dart';
 import '../../../l10n/app_localizations.dart';
+import 'comment_composer_sheet.dart';
 import 'comment_tile.dart';
 
-const int _maxCommentLength = 300;
 const double _composerRadius = 22;
 const double _composerHeight = 44;
 const double _sendButtonSize = 38;
@@ -29,10 +27,6 @@ const double _sheetRadius = 20;
 const double _headerHeight = 44;
 const double _replyIndent = 52;
 const double _composerTopGap = 8;
-const double _replyBannerHeight = 46;
-const double _expandedInputRadius = 12;
-const double _postButtonHeight = 32;
-const double _expandedComposerReserve = 113;
 
 /// 服务端评论底部弹窗：匿名列表、游标翻页、回复与登录发布。
 class DramaCommentsSheet extends StatefulWidget {
@@ -45,22 +39,14 @@ class DramaCommentsSheet extends StatefulWidget {
 }
 
 class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
-  final _input = TextEditingController();
-  final _inputFocus = FocusNode();
-  final _keyboardInset = KeyboardInsetNotifier.instance;
   late final CommentRepository _comments;
   late final CommentController _controller;
-  DramaComment? _replyTo;
   int? _serverCount;
   int _countRequest = 0;
 
   @override
   void initState() {
     super.initState();
-    _inputFocus.addListener(_onFocusChanged);
-    _input.addListener(_onInputChanged);
-    _keyboardInset.addListener(_onKeyboardInsetChanged);
-    unawaited(_keyboardInset.start());
     _comments = context.read<CommentRepository>();
     _controller = CommentController(
       comments: _comments,
@@ -73,67 +59,12 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
 
   @override
   void dispose() {
-    _keyboardInset.removeListener(_onKeyboardInsetChanged);
-    _inputFocus.removeListener(_onFocusChanged);
-    _input.removeListener(_onInputChanged);
     _controller.dispose();
-    _input.dispose();
-    _inputFocus.dispose();
     super.dispose();
   }
 
-  void _onFocusChanged() {
-    if (mounted) setState(() {});
-  }
-
-  void _onInputChanged() {
-    if (mounted) setState(() {});
-  }
-
-  void _onKeyboardInsetChanged() {
-    if (!mounted) return;
-    setState(() {});
-  }
-
-  double _keyboardHeight(BuildContext context) => math.max(
-    MediaQuery.viewInsetsOf(context).bottom,
-    _keyboardInset.value / MediaQuery.devicePixelRatioOf(context),
-  );
-
-  Future<void> _post() async {
-    if (_controller.submitting) return;
-    if (!await ensureSignedIn(context) || !mounted) return;
-    if (_input.text.trim().isEmpty) return;
-    unawaited(context.read<Haptics>().lightImpact());
-    final result = await _controller.publish(_input.text, replyTo: _replyTo);
-    if (!mounted) return;
-    if (result.isSuccess) {
-      _input.clear();
-      setState(() => _replyTo = null);
-      _inputFocus.requestFocus();
-      await _refreshCount();
-      return;
-    }
-    _showMessage(
-      result.errorMessage ?? AppLocalizations.of(context)!.commentPostFailed,
-    );
-  }
-
   void _beginReply(DramaComment comment) {
-    setState(() => _replyTo = comment);
-    _inputFocus.requestFocus();
-  }
-
-  void _cancelReply() {
-    if (_replyTo == null) return;
-    setState(() => _replyTo = null);
-  }
-
-  Future<void> _authenticateForComment() async {
-    _inputFocus.unfocus();
-    await ensureSignedIn(context);
-    if (!mounted || !context.read<AuthController>().isSignedIn) return;
-    _inputFocus.requestFocus();
+    unawaited(_openComposer(replyTo: comment));
   }
 
   Future<void> _refreshCount() async {
@@ -148,17 +79,22 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     }
   }
 
-  void _showMessage(String message) {
-    ScaffoldMessenger.of(
-      context,
-    ).showSnackBar(SnackBar(content: Text(message)));
+  Future<void> _openComposer({DramaComment? replyTo}) async {
+    await ensureSignedIn(context);
+    if (!mounted || !context.read<AuthController>().isSignedIn) return;
+    final published = await showModalBottomSheet<bool>(
+      context: context,
+      isScrollControlled: true,
+      isDismissible: true,
+      backgroundColor: Colors.transparent,
+      showDragHandle: false,
+      builder: (_) =>
+          CommentComposerSheet(controller: _controller, replyTo: replyTo),
+    );
+    if (published == true && mounted) await _refreshCount();
   }
 
   void _handleDismissLayerTap() {
-    if (_inputFocus.hasFocus || _keyboardHeight(context) > 0) {
-      _inputFocus.unfocus();
-      return;
-    }
     Navigator.pop(context);
   }
 
@@ -169,9 +105,6 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     final halfHeight = (screenHeight * 0.5).roundToDouble();
     final maxHeight = math.max(0.0, screenHeight - topSafeArea);
     final sheetHeight = math.min(halfHeight, maxHeight);
-    final inputFocused = _inputFocus.hasFocus;
-    final keyboardHeight = _keyboardHeight(context);
-    final expanded = inputFocused;
     return Stack(
       fit: StackFit.expand,
       children: [
@@ -184,40 +117,31 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
         ),
         Align(
           alignment: Alignment.bottomCenter,
-          child: AnimatedPadding(
-            duration: const Duration(milliseconds: 200),
-            curve: Curves.easeOut,
-            padding: EdgeInsets.only(bottom: keyboardHeight),
-            child: GestureDetector(
-              behavior: HitTestBehavior.opaque,
-              onTap: () {},
-              child: KeyedSubtree(
-                key: const Key('player-comments-sheet'),
-                child: SizedBox(
-                  key: const Key('comment-sheet-constraints'),
-                  height: sheetHeight,
-                  child: Container(
-                    decoration: const BoxDecoration(
-                      color: AppColors.card,
-                      borderRadius: BorderRadius.vertical(
-                        top: Radius.circular(_sheetRadius),
-                      ),
+          child: GestureDetector(
+            behavior: HitTestBehavior.opaque,
+            onTap: () {},
+            child: KeyedSubtree(
+              key: const Key('player-comments-sheet'),
+              child: SizedBox(
+                key: const Key('comment-sheet-constraints'),
+                height: sheetHeight,
+                child: Container(
+                  decoration: const BoxDecoration(
+                    color: AppColors.card,
+                    borderRadius: BorderRadius.vertical(
+                      top: Radius.circular(_sheetRadius),
                     ),
-                    child: SafeArea(
-                      top: false,
-                      child: ListenableBuilder(
-                        listenable: _controller,
-                        builder: (context, _) {
-                          return Padding(
-                            padding: const EdgeInsets.symmetric(horizontal: 16),
-                            child: _content(
-                              context,
-                              expanded: expanded,
-                              keyboardHeight: keyboardHeight,
-                            ),
-                          );
-                        },
-                      ),
+                  ),
+                  child: SafeArea(
+                    top: false,
+                    child: ListenableBuilder(
+                      listenable: _controller,
+                      builder: (context, _) {
+                        return Padding(
+                          padding: const EdgeInsets.symmetric(horizontal: 16),
+                          child: _content(context),
+                        );
+                      },
                     ),
                   ),
                 ),
@@ -229,16 +153,11 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     );
   }
 
-  Widget _content(
-    BuildContext context, {
-    required bool expanded,
-    required double keyboardHeight,
-  }) {
+  Widget _content(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
     final count = _serverCount ?? _controller.exactCount;
-    final composerReserve = expanded
-        ? _expandedComposerReserve
-        : _composerHeight + _composerTopGap;
+    final signedIn = context.watch<AuthController>().isSignedIn;
+    final composerReserve = _composerHeight + _composerTopGap;
     return Column(
       key: const Key('comment-sheet-content'),
       mainAxisSize: MainAxisSize.min,
@@ -280,31 +199,17 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
             ],
           ),
         ),
-        Expanded(
-          child: _list(
-            l10n,
-            composerReserve: composerReserve,
-            keyboardHeight: keyboardHeight,
-          ),
-        ),
-        if (_replyTo != null) _replyBanner(l10n, _replyTo!),
+        Expanded(child: _list(l10n, composerReserve: composerReserve)),
         Padding(
           key: const Key('comment-composer-area'),
-          padding: EdgeInsets.only(
-            top: expanded ? 12 : _composerTopGap,
-            bottom: expanded ? 12 : 0,
-          ),
-          child: _composer(l10n, focused: expanded),
+          padding: const EdgeInsets.only(top: _composerTopGap),
+          child: _fakeComposer(l10n, signedIn: signedIn),
         ),
       ],
     );
   }
 
-  Widget _list(
-    AppLocalizations l10n, {
-    required double composerReserve,
-    required double keyboardHeight,
-  }) {
+  Widget _list(AppLocalizations l10n, {required double composerReserve}) {
     if (_controller.loading && _controller.comments.isEmpty) {
       return const Padding(
         padding: EdgeInsets.only(top: 4),
@@ -340,10 +245,7 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     }
     return ListView.builder(
       key: const Key('comment-list'),
-      padding: EdgeInsets.only(
-        top: 4,
-        bottom: composerReserve + keyboardHeight,
-      ),
+      padding: EdgeInsets.only(top: 4, bottom: composerReserve),
       itemCount: _controller.comments.length + 1,
       itemBuilder: (context, index) {
         if (index == _controller.comments.length) return _footer(l10n);
@@ -373,107 +275,10 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
     return const SizedBox(height: 8);
   }
 
-  Widget _replyBanner(AppLocalizations l10n, DramaComment replyTo) => SizedBox(
-    height: _replyBannerHeight,
-    child: Padding(
-      padding: const EdgeInsets.only(bottom: 6),
-      child: Row(
-        children: [
-          Expanded(
-            child: Text(
-              l10n.replyingTo(
-                replyTo.nickname.isEmpty
-                    ? l10n.anonymousUser
-                    : replyTo.nickname,
-              ),
-              style: const TextStyle(color: AppColors.muted, fontSize: 12),
-            ),
-          ),
-          IconButton(
-            key: const Key('comment-cancel-reply'),
-            tooltip: l10n.cancelReply,
-            onPressed: _cancelReply,
-            visualDensity: VisualDensity.compact,
-            icon: const Icon(Icons.close_rounded, size: 18),
-          ),
-        ],
-      ),
-    ),
-  );
-
-  InputDecoration _composerDecoration(
-    String hint, {
-    required bool focused,
-    required bool multiline,
-  }) {
-    final radius = BorderRadius.circular(
-      focused ? _expandedInputRadius : _composerRadius,
-    );
-    final clear = OutlineInputBorder(
-      borderRadius: radius,
-      borderSide: BorderSide.none,
-    );
-    return InputDecoration(
-      hintText: hint,
-      hintStyle: TextStyle(
-        color: AppColors.muted,
-        fontSize: 14,
-        height: multiline ? 1.4 : null,
-      ),
-      counterText: '',
-      contentPadding: EdgeInsets.symmetric(
-        horizontal: 16,
-        vertical: focused ? 12 : 0,
-      ),
-      isDense: true,
-      border: clear,
-      enabledBorder: clear,
-      focusedBorder: clear,
-    );
-  }
-
-  void _activateComposer(bool signedIn) {
-    if (signedIn) {
-      _inputFocus.requestFocus();
-      return;
-    }
-    unawaited(_authenticateForComment());
-  }
-
-  Widget _composer(AppLocalizations l10n, {required bool focused}) {
-    final signedIn = context.watch<AuthController>().isSignedIn;
-    final hasContent = _input.text.trim().isNotEmpty;
-    final canPost = signedIn && hasContent && !_controller.submitting;
-    return Container(
-      key: const Key('comment-composer'),
-      child: TextFieldTapRegion(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            Offstage(
-              offstage: focused,
-              child: _fakeComposer(l10n, signedIn: signedIn),
-            ),
-            Offstage(
-              offstage: !focused,
-              child: _realComposer(
-                l10n,
-                signedIn: signedIn,
-                hasContent: hasContent,
-                canPost: canPost,
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
   Widget _fakeComposer(AppLocalizations l10n, {required bool signedIn}) {
     return GestureDetector(
       behavior: HitTestBehavior.opaque,
-      onTap: () => _activateComposer(signedIn),
+      onTap: _openComposer,
       child: Container(
         key: const Key('comment-input-placeholder'),
         height: _composerHeight,
@@ -510,7 +315,7 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
                 tooltip: l10n.postComment,
                 padding: EdgeInsets.zero,
                 iconSize: 18,
-                onPressed: () => _activateComposer(signedIn),
+                onPressed: _openComposer,
                 icon: const Icon(Icons.send_rounded),
               ),
             ),
@@ -519,87 +324,6 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
       ),
     );
   }
-
-  Widget _realComposer(
-    AppLocalizations l10n, {
-    required bool signedIn,
-    required bool hasContent,
-    required bool canPost,
-  }) {
-    final multiline = _input.text.contains('\n');
-    return Column(
-      mainAxisSize: MainAxisSize.min,
-      crossAxisAlignment: CrossAxisAlignment.stretch,
-      children: [
-        AnimatedContainer(
-          key: const Key('comment-input-surface'),
-          duration: const Duration(milliseconds: 150),
-          curve: Curves.easeOut,
-          decoration: BoxDecoration(
-            color: AppColors.commentInput,
-            borderRadius: BorderRadius.circular(_expandedInputRadius),
-          ),
-          child: TextField(
-            key: const Key('comment-input'),
-            controller: _input,
-            focusNode: _inputFocus,
-            readOnly: !signedIn,
-            canRequestFocus: signedIn,
-            minLines: 1,
-            maxLines: 4,
-            maxLength: _maxCommentLength,
-            textAlignVertical: multiline
-                ? TextAlignVertical.top
-                : TextAlignVertical.center,
-            style: TextStyle(
-              color: AppColors.cream,
-              fontSize: 15,
-              height: multiline ? 1.4 : null,
-            ),
-            cursorColor: AppColors.blue,
-            decoration: _composerDecoration(
-              signedIn ? l10n.writeComment : l10n.commentLoginHint,
-              focused: true,
-              multiline: multiline,
-            ),
-            onTap: signedIn ? null : _authenticateForComment,
-          ),
-        ),
-        const SizedBox(height: 12),
-        Align(
-          alignment: Alignment.centerRight,
-          child: SizedBox(
-            height: _postButtonHeight,
-            child: TextButton(
-              key: const Key('comment-post'),
-              onPressed: canPost ? _post : null,
-              style: TextButton.styleFrom(
-                minimumSize: const Size(0, _postButtonHeight),
-                padding: const EdgeInsets.symmetric(horizontal: 16),
-                tapTargetSize: MaterialTapTargetSize.shrinkWrap,
-                backgroundColor: hasContent
-                    ? AppColors.blue.withValues(alpha: 0.12)
-                    : AppColors.raised,
-                foregroundColor: AppColors.blue,
-                disabledForegroundColor: AppColors.muted,
-                disabledBackgroundColor: AppColors.raised,
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(8),
-                ),
-              ),
-              child: Text(
-                l10n.postComment,
-                style: const TextStyle(
-                  fontSize: 14,
-                  fontWeight: FontWeight.w600,
-                ),
-              ),
-            ),
-          ),
-        ),
-      ],
-    );
-  }
 }
 
 class _CommentThread extends StatelessWidget {
@@ -641,9 +365,8 @@ class _CommentThread extends StatelessWidget {
                   Text(
                     expanded
                         ? AppLocalizations.of(context)!.hideReplies
-                        : AppLocalizations.of(
-                            context,
-                          )!.viewReplies(comment.replyCount),
+                        : AppLocalizations.of(context)!
+                              .viewReplies(comment.replyCount),
                     style: const TextStyle(
                       color: AppColors.muted,
                       fontSize: 12,
diff --git a/test/comment/drama_comments_sheet_test.dart b/test/comment/drama_comments_sheet_test.dart
index 16a70bf..a52cbb2 100644
--- a/test/comment/drama_comments_sheet_test.dart
+++ b/test/comment/drama_comments_sheet_test.dart
@@ -48,21 +48,18 @@ void main() {
     final repository = FakeCommentRepository(pages: [const CommentPage()]);
 
     await _pumpSheet(tester, repository: repository);
-    final input = find.byKey(const Key('comment-input'), skipOffstage: false);
     final placeholder = find.byKey(const Key('comment-input-placeholder'));
 
     expect(placeholder, findsOneWidget);
-    expect(find.byKey(const Key('comment-input')), findsNothing);
     expect(find.text('Sign in to comment'), findsOneWidget);
-    expect(tester.widget<TextField>(input).focusNode?.hasFocus, isFalse);
     await tester.tap(placeholder);
     await tester.pumpAndSettle();
 
     expect(find.text('Sign in to continue'), findsOneWidget);
-    expect(tester.widget<TextField>(input).focusNode?.hasFocus, isFalse);
     await tester.tap(find.text('Not now'));
     await tester.pumpAndSettle();
-    expect(tester.widget<TextField>(input).focusNode?.hasFocus, isFalse);
+    expect(find.byKey(const Key('comment-composer-sheet')), findsNothing);
+    expect(placeholder, findsOneWidget);
   });
 
   testWidgets('should_focus_comment_input_after_successful_login', (
@@ -82,31 +79,35 @@ void main() {
     (auth as _TestAuthController).setSignedIn(true);
     await tester.pump();
     Navigator.of(tester.element(find.byKey(const Key('auth-landing')))).pop();
-    await tester.pump();
-    await tester.pump(const Duration(milliseconds: 300));
+    await tester.pumpAndSettle();
 
     expect(
       tester
-          .widget<TextField>(find.byKey(const Key('comment-input')))
+          .widget<TextField>(find.byKey(const Key('comment-composer-input')))
           .focusNode
           ?.hasFocus,
       isTrue,
     );
   });
 
-  testWidgets('should_focus_real_input_when_fake_send_is_tapped', (
+  testWidgets('should_open_composer_sheet_when_fake_send_is_tapped', (
     tester,
   ) async {
+    tester.view.physicalSize = const Size(390, 844);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
     final repository = FakeCommentRepository(pages: [const CommentPage()]);
 
     await _pumpSheet(tester, repository: repository);
-    expect(find.byKey(const Key('comment-input')), findsNothing);
 
     await tester.tap(find.byKey(const Key('comment-post')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('comment-input-placeholder')), findsNothing);
-    final input = find.byKey(const Key('comment-input'));
+    final composer = find.byKey(const Key('comment-composer-sheet'));
+    expect(composer, findsOneWidget);
+    expect(tester.getSize(composer).height, closeTo(844 / 2, 0.1));
+    final input = find.byKey(const Key('comment-composer-input'));
     expect(input, findsOneWidget);
     expect(tester.widget<TextField>(input).focusNode?.hasFocus, isTrue);
     expect(
@@ -234,16 +235,16 @@ void main() {
       await tester.tap(find.byKey(const Key('comment-input-placeholder')));
       await tester.pumpAndSettle();
       await tester.enterText(
-        find.byKey(const Key('comment-input')),
+        find.byKey(const Key('comment-composer-input')),
         'blocked text',
       );
       await tester.pump();
-      await tester.tap(find.byKey(const Key('comment-post')));
+      await tester.tap(find.byKey(const Key('comment-composer-post')));
       await tester.pumpAndSettle();
 
       expect(find.text('评论包含敏感词'), findsOneWidget);
       final field = tester.widget<TextField>(
-        find.byKey(const Key('comment-input')),
+        find.byKey(const Key('comment-composer-input')),
       );
       expect(field.controller?.text, 'blocked text');
       // 发送失败时保留输入与焦点，用户可以直接改完再发。
@@ -251,9 +252,7 @@ void main() {
     },
   );
 
-  testWidgets('should_clear_and_keep_input_focused_after_successful_post', (
-    tester,
-  ) async {
+  testWidgets('should_close_composer_after_successful_post', (tester) async {
     addTearDown(tester.view.resetViewInsets);
     final repository = FakeCommentRepository(
       pages: [const CommentPage()],
@@ -262,7 +261,7 @@ void main() {
     );
 
     await _pumpSheet(tester, repository: repository);
-    final input = find.byKey(const Key('comment-input'));
+    final input = find.byKey(const Key('comment-composer-input'));
     tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.tap(find.byKey(const Key('comment-input-placeholder')));
     await tester.pumpAndSettle();
@@ -271,28 +270,21 @@ void main() {
     await tester.pump();
     expect(
       tester
-          .widget<TextButton>(find.byKey(const Key('comment-post')))
+          .widget<TextButton>(find.byKey(const Key('comment-composer-post')))
           .onPressed,
       isNotNull,
     );
-    await tester.tap(find.byKey(const Key('comment-post')));
+    await tester.tap(find.byKey(const Key('comment-composer-post')));
     await tester.pumpAndSettle();
 
-    expect(tester.widget<TextField>(input).controller?.text, isEmpty);
-    expect(tester.widget<TextField>(input).focusNode?.hasFocus, isTrue);
-    expect(tester.widget<TextField>(input).maxLines, 4);
+    expect(find.byKey(const Key('comment-composer-sheet')), findsNothing);
     expect(find.byKey(const Key('comment-list')), findsOneWidget);
     expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
-    expect(
-      tester
-          .widget<TextButton>(find.byKey(const Key('comment-post')))
-          .onPressed,
-      isNull,
-    );
+    expect(find.byKey(const Key('comment-input-placeholder')), findsOneWidget);
     expect(repository.countCalls, ['5', '5']);
   });
 
-  testWidgets('should_keep_composer_separate_when_keyboard_opens', (
+  testWidgets('should_keep_comment_panel_fixed_and_open_composer_sheet', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 844);
@@ -309,128 +301,59 @@ void main() {
     );
 
     await _pumpSheet(tester, repository: repository);
-    expect(find.byKey(const Key('comment-list')), findsOneWidget);
-    expect(find.byKey(const Key('comment-input')), findsNothing);
-    expect(find.byKey(const Key('comment-input-placeholder')), findsOneWidget);
-    final hiddenInput = find.byKey(
-      const Key('comment-input'),
-      skipOffstage: false,
-    );
-    final editableBefore = tester.state<EditableTextState>(
-      find.descendant(
-        of: hiddenInput,
-        matching: find.byType(EditableText, skipOffstage: false),
-        skipOffstage: false,
-      ),
-    );
-
-    final sheet = find.byKey(const Key('player-comments-sheet'));
+    final commentsSheet = find.byKey(const Key('player-comments-sheet'));
     final list = find.byKey(const Key('comment-list'));
-    final heightBeforeKeyboard = tester.getSize(sheet).height;
-    tester.view.viewInsets = const FakeViewPadding(bottom: 180);
+    final placeholder = find.byKey(const Key('comment-input-placeholder'));
+    final sheetRect = tester.getRect(commentsSheet);
+    final sheetHeight = tester.getSize(commentsSheet).height;
+
     await tester.tap(find.byKey(const Key('comment-input-placeholder')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('comment-list')), findsOneWidget);
-    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
-    expect(find.byKey(const Key('comment-composer')), findsOneWidget);
-    expect(find.byKey(const Key('comment-input-surface')), findsOneWidget);
-    expect(find.byKey(const Key('comment-input-placeholder')), findsNothing);
-    expect(
-      tester.widget<TextField>(find.byKey(const Key('comment-input'))).maxLines,
-      4,
+    final composer = find.byKey(const Key('comment-composer-sheet'));
+    final composerInput = find.byKey(const Key('comment-composer-input'));
+    expect(composer, findsOneWidget);
+    expect(tester.getSize(composer).height, closeTo(844 / 2, 0.1));
+    expect(tester.widget<TextField>(composerInput).focusNode?.hasFocus, isTrue);
+    final underlyingSheet = find.byKey(
+      const Key('player-comments-sheet'),
+      skipOffstage: false,
     );
-    final editableAfter = tester.state<EditableTextState>(
-      find.descendant(
-        of: find.byKey(const Key('comment-input')),
-        matching: find.byType(EditableText),
-      ),
-    );
-    expect(identical(editableBefore, editableAfter), isTrue);
+    expect(tester.getRect(underlyingSheet), sheetRect);
+    expect(tester.getSize(underlyingSheet).height, closeTo(sheetHeight, 0.1));
 
-    expect(sheet, findsOneWidget);
-    expect(list, findsOneWidget);
-    expect(tester.getSize(sheet).height, closeTo(heightBeforeKeyboard, 0.1));
-    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
-    final field = tester.widget<TextField>(
-      find.byKey(const Key('comment-input')),
-    );
+    final field = tester.widget<TextField>(composerInput);
     expect(field.minLines, 1);
     expect(field.maxLines, 4);
     expect(field.style?.fontSize, 15);
-    expect(
-      tester
-          .widget<TextButton>(find.byKey(const Key('comment-post')))
-          .onPressed,
-      isNull,
-    );
-    expect(tester.getSize(find.byKey(const Key('comment-post'))).height, 32);
-    final listRect = tester.getRect(list);
-    final inputRect = tester.getRect(find.byKey(const Key('comment-input')));
-    expect(listRect.overlaps(inputRect), isFalse);
-    expect(listRect.bottom, lessThanOrEqualTo(inputRect.top));
     expect(find.byIcon(Icons.image_outlined), findsNothing);
     expect(find.byIcon(Icons.emoji_emotions_outlined), findsNothing);
     expect(find.byIcon(Icons.alternate_email_rounded), findsNothing);
 
-    await tester.enterText(find.byKey(const Key('comment-input')), 'Nice');
+    tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.pump();
+    await tester.pump(const Duration(milliseconds: 200));
+    expect(tester.getSize(composer).height, closeTo(844 / 2, 0.1));
+    expect(tester.getBottomLeft(composer).dy, closeTo(844 - 180, 0.1));
     expect(
-      tester
-          .widget<TextButton>(find.byKey(const Key('comment-post')))
-          .onPressed,
-      isNotNull,
-    );
-
-    final editableDuringKeyboard = tester.state<EditableTextState>(
-      find.descendant(
-        of: find.byKey(const Key('comment-input')),
-        matching: find.byType(EditableText),
-      ),
-    );
-    expect(identical(editableAfter, editableDuringKeyboard), isTrue);
-    expect(tester.getBottomLeft(sheet).dy, closeTo(844 - 180, 0.1));
-    expect(
-      tester.widget<ListView>(list).padding?.resolve(TextDirection.ltr).bottom,
-      greaterThanOrEqualTo(180 + 44),
-    );
-    expect(
-      tester.getBottomLeft(find.byKey(const Key('comment-input'))).dy,
+      tester.getBottomLeft(composerInput).dy,
       lessThanOrEqualTo(844 - 180),
     );
-    expect(
-      tester
-          .widget<TextField>(find.byKey(const Key('comment-input')))
-          .focusNode
-          ?.hasFocus,
-      isTrue,
-    );
+    expect(tester.getRect(underlyingSheet), sheetRect);
 
-    await tester.tapAt(const Offset(20, 20));
-    await tester.pump();
-    expect(tester.widget<TextField>(hiddenInput).focusNode?.hasFocus, isFalse);
     tester.view.viewInsets = const FakeViewPadding();
     await tester.pumpAndSettle();
+    expect(composer, findsNothing);
+    expect(commentsSheet, findsOneWidget);
     expect(list, findsOneWidget);
-    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
-    expect(find.byKey(const Key('comment-composer')), findsOneWidget);
-    expect(find.byKey(const Key('comment-input-placeholder')), findsOneWidget);
-    expect(find.byKey(const Key('comment-input')), findsNothing);
-    expect(tester.getSize(sheet).height, closeTo(heightBeforeKeyboard, 0.1));
-    expect(tester.getSize(sheet).height, lessThan(520));
-    final editableAfterKeyboard = tester.state<EditableTextState>(
-      find.descendant(
-        of: hiddenInput,
-        matching: find.byType(EditableText, skipOffstage: false),
-        skipOffstage: false,
-      ),
-    );
-    expect(identical(editableAfter, editableAfterKeyboard), isTrue);
-    expect(tester.widget<TextField>(hiddenInput).controller?.text, 'Nice');
-    expect(tester.widget<TextField>(hiddenInput).focusNode?.hasFocus, isFalse);
+    expect(placeholder, findsOneWidget);
+    expect(tester.getRect(commentsSheet), sheetRect);
+    expect(tester.getSize(commentsSheet).height, closeTo(sheetHeight, 0.1));
   });
 
-  testWidgets('should_dismiss_from_outside_in_two_steps', (tester) async {
+  testWidgets('should_close_composer_before_comment_panel_from_outside', (
+    tester,
+  ) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -446,37 +369,20 @@ void main() {
 
     await _pumpSheet(tester, repository: repository);
     final sheet = find.byKey(const Key('player-comments-sheet'));
-    final input = find.byKey(const Key('comment-input'));
-    final hiddenInput = find.byKey(
-      const Key('comment-input'),
-      skipOffstage: false,
-    );
     expect(
       find.byKey(const Key('player-comments-dismiss-layer')),
       findsOneWidget,
     );
 
-    tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.tap(find.byKey(const Key('comment-input-placeholder')));
     await tester.pumpAndSettle();
     expect(sheet, findsOneWidget);
-    expect(input, findsOneWidget);
-    expect(tester.widget<TextField>(input).focusNode?.hasFocus, isTrue);
-
-    await tester.tap(find.byKey(const Key('comment-list')));
-    await tester.pump();
-    expect(sheet, findsOneWidget);
+    expect(find.byKey(const Key('comment-composer-sheet')), findsOneWidget);
 
     await tester.tapAt(const Offset(20, 20));
-    await tester.pump();
-    expect(sheet, findsOneWidget);
-    expect(tester.widget<TextField>(hiddenInput).focusNode?.hasFocus, isFalse);
-    expect(find.byKey(const Key('comment-input-placeholder')), findsOneWidget);
-    expect(input, findsNothing);
-
-    tester.view.viewInsets = const FakeViewPadding();
     await tester.pumpAndSettle();
     expect(sheet, findsOneWidget);
+    expect(find.byKey(const Key('comment-composer-sheet')), findsNothing);
 
     await tester.tapAt(const Offset(20, 20));
     await tester.pumpAndSettle();
@@ -694,22 +600,18 @@ void main() {
     await tester.tap(find.byKey(const Key('comment-input-placeholder')));
     await tester.pumpAndSettle();
     await tester.enterText(
-      find.byKey(const Key('comment-input')),
+      find.byKey(const Key('comment-composer-input')),
       'hello badword',
     );
     await tester.pump();
-    await tester.tap(find.byKey(const Key('comment-post')));
+    await tester.tap(find.byKey(const Key('comment-composer-post')));
     await tester.pumpAndSettle();
 
-    FocusManager.instance.primaryFocus?.unfocus();
-    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('comment-composer-sheet')), findsNothing);
     expect(find.text('hello ***'), findsOneWidget);
     expect(find.text('Under review'), findsOneWidget);
     expect(haptics.lightImpacts, 1);
-    final field = tester.widget<TextField>(
-      find.byKey(const Key('comment-input'), skipOffstage: false),
-    );
-    expect(field.controller?.text, isEmpty);
+    expect(find.byKey(const Key('comment-input-placeholder')), findsOneWidget);
   });
 
   testWidgets('should_send_parent_id_when_replying_to_top_level_comment', (
@@ -731,16 +633,19 @@ void main() {
 
     await _pumpSheet(tester, repository: repository);
     await tester.tap(find.byKey(const Key('comment-reply-10')));
-    await tester.pump();
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('comment-composer-sheet')), findsOneWidget);
     expect(find.textContaining('Replying to'), findsOneWidget);
-    await tester.enterText(find.byKey(const Key('comment-input')), 'My reply');
+    await tester.enterText(
+      find.byKey(const Key('comment-composer-input')),
+      'My reply',
+    );
     await tester.pump();
-    await tester.tap(find.byKey(const Key('comment-post')));
+    await tester.tap(find.byKey(const Key('comment-composer-post')));
     await tester.pumpAndSettle();
 
     expect(repository.publishCalls.single.parentId, '10');
-    FocusManager.instance.primaryFocus?.unfocus();
-    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('comment-composer-sheet')), findsNothing);
     expect(find.text('My reply'), findsOneWidget);
   });
 
diff --git a/test/widget_test.dart b/test/widget_test.dart
index 65ddeff..6ee71f8 100644
--- a/test/widget_test.dart
+++ b/test/widget_test.dart
@@ -250,11 +250,12 @@ void main() {
     expect(find.text('No comments yet.'), findsOneWidget);
     await tester.tap(find.byKey(const Key('comment-input-placeholder')));
     await tester.pumpAndSettle();
-    await tester.enterText(find.byKey(const Key('comment-input')), 'Nice demo');
+    await tester.enterText(
+      find.byKey(const Key('comment-composer-input')),
+      'Nice demo',
+    );
     await tester.pump();
-    await tester.tap(find.byKey(const Key('comment-post')));
-    await tester.pumpAndSettle();
-    FocusManager.instance.primaryFocus?.unfocus();
+    await tester.tap(find.byKey(const Key('comment-composer-post')));
     await tester.pumpAndSettle();
     expect(find.text('Nice demo'), findsOneWidget);
     await tester.binding.handlePopRoute();