diff --git a/.kilo/package-lock.json b/.kilo/package-lock.json
new file mode 100644
index 0000000..86ea34f
--- /dev/null
+++ b/.kilo/package-lock.json
@@ -0,0 +1,115 @@
+{
+  "name": ".kilo",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "@kilocode/plugin": "7.2.10"
+      }
+    },
+    "node_modules/@kilocode/plugin": {
+      "version": "7.2.10",
+      "resolved": "https://registry.npmjs.org/@kilocode/plugin/-/plugin-7.2.10.tgz",
+      "integrity": "sha512-VJPhJC+E5WWu7XgEJzrVOxKJlwJ+OATwxEzgjqEPj8KN5N38YxUPBY/rzUTjv90x7nkzyk1rFGfCVqXdA/Koug==",
+      "license": "MIT",
+      "dependencies": {
+        "@kilocode/sdk": "7.2.10",
+        "zod": "4.1.8"
+      },
+      "peerDependencies": {
+        "@opentui/core": ">=0.1.97",
+        "@opentui/solid": ">=0.1.97"
+      },
+      "peerDependenciesMeta": {
+        "@opentui/core": {
+          "optional": true
+        },
+        "@opentui/solid": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@kilocode/sdk": {
+      "version": "7.2.10",
+      "resolved": "https://registry.npmjs.org/@kilocode/sdk/-/sdk-7.2.10.tgz",
+      "integrity": "sha512-H6jGXYAhN/yjOGX3MRZ0OxyEAuRGY3VOwDbLTh4O6ljpgutFHaLvomDZ82qNVy7gl7AjJgi3SAQAt9UQpeGl/w==",
+      "license": "MIT",
+      "dependencies": {
+        "cross-spawn": "7.0.6"
+      }
+    },
+    "node_modules/cross-spawn": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
+      "license": "MIT",
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/isexe": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
+      "integrity": "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==",
+      "license": "ISC"
+    },
+    "node_modules/path-key": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+      "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "license": "MIT",
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/zod": {
+      "version": "4.1.8",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    }
+  }
+}
diff --git a/src/screens/home/PostDetailScreen.tsx b/src/screens/home/PostDetailScreen.tsx
index ded82b6..4919fae 100644
--- a/src/screens/home/PostDetailScreen.tsx
+++ b/src/screens/home/PostDetailScreen.tsx
@@ -22,7 +22,7 @@ import {
   Image,
   Clipboard,
 } from 'react-native';
-import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
 import { useNavigation, useRouter, useLocalSearchParams } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import * as ImagePicker from 'expo-image-picker';
@@ -795,8 +795,9 @@ export const PostDetailScreen: React.FC = () => {
     }
     
     setCommentText('');
-    setCommentImages([]); // 清除图片
-    setReplyingTo(null); // 清除回复状态
+    setCommentImages([]);
+    setReplyingTo(null);
+    setIsComposerVisible(false);
     
     // 更新帖子评论数
     setPost(prev => prev ? {
@@ -1235,74 +1236,35 @@ export const PostDetailScreen: React.FC = () => {
           )}
         </View>
 
-        {/* 底部操作栏 - QQ频道风格 */}
-        <View style={[styles.actionBar, { marginTop: responsiveGap }]}>
-          <TouchableOpacity style={styles.actionButton} onPress={handleLike}>
-            <MaterialCommunityIcons
-              name={post.is_liked ? 'heart' : 'heart-outline'}
-              size={isDesktop ? 24 : 20}
-              color={post.is_liked ? colors.error.main : colors.text.secondary}
-            />
-            <Text variant="caption" color={post.is_liked ? colors.error.main : colors.text.secondary} style={styles.actionText}>
-              {post.likes_count > 0 ? formatNumber(post.likes_count) : '点赞'}
+        {/* 评论标题 - 类似图片中的样式 */}
+        <View style={[styles.commentSectionHeader, { marginTop: responsiveGap * 1.5, marginBottom: responsiveGap }]}>
+          <View style={styles.commentSectionTitleRow}>
+            <Text
+              variant="body"
+              style={[
+                styles.commentSectionTitle,
+                { fontSize: isDesktop ? fontSizes.lg : fontSizes.md }
+              ]}
+            >
+              评论
             </Text>
-          </TouchableOpacity>
-
-          <TouchableOpacity style={styles.actionButton}>
-            <MaterialCommunityIcons name="comment-outline" size={isDesktop ? 24 : 20} color={colors.text.secondary} />
-            <Text variant="caption" color={colors.text.secondary} style={styles.actionText}>
-              {post.comments_count > 0 ? formatNumber(post.comments_count) : '评论'}
+            <Text variant="caption" color={colors.text.hint} style={styles.commentSectionCount}>
+              {post.comments_count || 0}
             </Text>
-          </TouchableOpacity>
-
-          <TouchableOpacity style={styles.actionButton} onPress={handleShare}>
-            <MaterialCommunityIcons name="share-outline" size={isDesktop ? 24 : 20} color={colors.text.secondary} />
-            <Text variant="caption" color={colors.text.secondary} style={styles.actionText}>
-              {post.shares_count > 0 ? formatNumber(post.shares_count) : '分享'}
-            </Text>
-          </TouchableOpacity>
-
-          <TouchableOpacity style={styles.actionButton} onPress={handleFavorite}>
-            <MaterialCommunityIcons
-              name={post.is_favorited ? 'bookmark' : 'bookmark-outline'}
-              size={isDesktop ? 24 : 20}
-              color={post.is_favorited ? colors.warning.main : colors.text.secondary}
-            />
-            <Text variant="caption" color={post.is_favorited ? colors.warning.main : colors.text.secondary} style={styles.actionText}>
-              {post.is_favorited ? '已收藏' : '收藏'}
-            </Text>
-          </TouchableOpacity>
-        </View>
-
-        {/* 评论标题 - 现代化简洁分区头 */}
-        <View style={[styles.commentSectionHeader, { marginTop: responsiveGap, marginBottom: responsiveGap }]}>
-          <View style={styles.commentSectionTitleBlock}>
-            <View style={styles.commentSectionTitleRow}>
-              <Text
-                variant="body"
-                style={[
-                  styles.commentSectionTitle,
-                  { fontSize: isDesktop ? fontSizes.xl : fontSizes.lg }
-                ]}
-              >
-                评论区
-              </Text>
-              <View style={styles.commentCountBadge}>
-                <Text variant="caption" style={styles.commentCountText}>{post.comments_count}</Text>
-              </View>
-            </View>
           </View>
+          <View style={styles.commentSectionUnderline} />
         </View>
       </View>
     );
-  }, [post, postImages, currentUser?.id, isDeleting, handleLike, handleShare, handleFavorite, handleDeletePost, handleEditPost, handleImagePress, voteResult, isVoteLoading, handleVote, handleUnvote, isDesktop, isTablet, isWideScreen, responsivePadding, responsiveGap]);
+  }, [post, postImages, currentUser?.id, isDeleting, handleDeletePost, handleEditPost, handleImagePress, voteResult, isVoteLoading, handleVote, handleUnvote, isDesktop, isTablet, isWideScreen, responsivePadding, responsiveGap]);
 
   // 回复评论
   const [replyingTo, setReplyingTo] = useState<Comment | null>(null);
+  const [isComposerVisible, setIsComposerVisible] = useState(false);
 
   const handleReply = (comment: Comment) => {
     setReplyingTo(comment);
-    // 可以在这里添加聚焦输入框的逻辑
+    setIsComposerVisible(true);
   };
 
   const handleCancelReply = () => {
@@ -1373,37 +1335,42 @@ export const PostDetailScreen: React.FC = () => {
     );
   }, [currentUser?.id, handleDeleteComment, handleImagePress, handleLikeComment, handleLoadMoreReplies, post?.user_id, handleReportComment]);
 
-  // 渲染空评论 - 现代化设计
+  // 渲染空评论 - 类似图片中的样式
   const renderEmptyComments = useCallback(() => (
     <View style={styles.emptyCommentsContainer}>
-      <View style={styles.emptyCommentsIconWrapper}>
-        <MaterialCommunityIcons
-          name="message-reply-text-outline"
-          size={isDesktop ? 24 : 22}
-          color={colors.text.secondary}
-        />
+      {/* 四个方块图标 */}
+      <View style={styles.emptyCommentsGrid}>
+        <View style={styles.emptyCommentsGridItem} />
+        <View style={styles.emptyCommentsGridItem} />
+        <View style={styles.emptyCommentsGridItem} />
+        <View style={[styles.emptyCommentsGridItem, styles.emptyCommentsGridItemActive]} />
       </View>
-      <Text variant="body" style={styles.emptyCommentsTitle}>
-        还没有评论
-      </Text>
-      <Text variant="caption" color={colors.text.secondary} style={styles.emptyCommentsSubtitle}>
-        成为第一个评论的人吧~
+      <Text variant="caption" color={colors.text.hint} style={styles.emptyCommentsSubtitle}>
+        这里空空如也，邀请好友来互动吧！
       </Text>
     </View>
-  ), [isDesktop]);
+  ), []);
+
+  const openComposer = () => {
+    setIsComposerVisible(true);
+  };
+
+  const closeComposer = () => {
+    setIsComposerVisible(false);
+    Keyboard.dismiss();
+  };
 
-  // 渲染评论输入框
   const renderCommentInput = () => (
     <View style={[
       styles.inputContainer,
-      { 
+      {
         paddingHorizontal: responsivePadding,
         paddingVertical: responsiveGap,
-        paddingBottom: keyboardHeight + responsiveGap + insets.bottom 
+        paddingBottom: keyboardHeight + responsiveGap + insets.bottom,
       }
     ]}>
       {/* 回复提示 */}
-      {replyingTo && (
+      {replyingTo && !isComposerVisible && (
         <View style={styles.replyingToContainer}>
           <Text variant="caption" color={colors.text.secondary}>
             回复 <Text style={styles.replyingToName}>{replyingTo.author.nickname}</Text>
@@ -1413,70 +1380,153 @@ export const PostDetailScreen: React.FC = () => {
           </TouchableOpacity>
         </View>
       )}
-      
-      {/* 已选图片预览 */}
-      {commentImages.length > 0 && (
-        <ScrollView horizontal style={styles.commentImagesPreview} showsHorizontalScrollIndicator={false}>
-          {commentImages.map((image, index) => (
-            <View key={index} style={styles.commentImageWrapper}>
-              <Image source={{ uri: image.uri }} style={styles.commentImageThumbnail} resizeMode="cover" />
-              {image.uploading && (
-                <View style={styles.uploadingOverlay}>
-                  <Loading size="sm" />
-                </View>
-              )}
-              <TouchableOpacity
-                style={styles.removeImageButton}
-                onPress={() => handleRemoveCommentImage(index)}
-              >
-                <MaterialCommunityIcons name="close-circle" size={18} color={colors.text.primary} />
+
+      {!isComposerVisible ? (
+        /* Collapsed state - simple input trigger */
+        <View style={styles.bottomComposerRow}>
+          <TouchableOpacity
+            style={styles.inputTrigger}
+            onPress={openComposer}
+            activeOpacity={0.7}
+          >
+            <Text
+              style={styles.inputTriggerText}
+              numberOfLines={1}
+            >
+              {replyingTo ? `回复 ${replyingTo.author.nickname}...` : '来说点什么吧！'}
+            </Text>
+          </TouchableOpacity>
+
+          <TouchableOpacity style={styles.bottomActionItem} onPress={handleLike}>
+            <MaterialCommunityIcons
+              name={post?.is_liked ? 'thumb-up' : 'thumb-up-outline'}
+              size={isDesktop ? 23 : 21}
+              color={post?.is_liked ? colors.primary.main : colors.text.secondary}
+            />
+            <Text variant="caption" style={styles.bottomActionCount}>
+              {formatNumber(post?.likes_count || 0)}
+            </Text>
+          </TouchableOpacity>
+
+          <TouchableOpacity style={styles.bottomActionItem} onPress={handleFavorite}>
+            <MaterialCommunityIcons
+              name={post?.is_favorited ? 'star' : 'star-outline'}
+              size={isDesktop ? 23 : 21}
+              color={post?.is_favorited ? colors.warning.main : colors.text.secondary}
+            />
+            <Text variant="caption" style={styles.bottomActionCount}>
+              {formatNumber(post?.favorites_count || 0)}
+            </Text>
+          </TouchableOpacity>
+
+          <TouchableOpacity style={styles.bottomActionItem} onPress={handleShare}>
+            <MaterialCommunityIcons name="share-outline" size={isDesktop ? 23 : 21} color={colors.text.secondary} />
+            <Text variant="caption" style={styles.bottomActionCount}>
+              {formatNumber(post?.shares_count || 0)}
+            </Text>
+          </TouchableOpacity>
+        </View>
+      ) : (
+        /* Expanded state - full composer */
+        <View style={styles.expandedComposer}>
+          {/* Reply hint */}
+          {replyingTo && (
+            <View style={styles.expandedReplyHint}>
+              <Text variant="caption" color={colors.text.secondary}>
+                回复 <Text style={styles.replyingToName}>{replyingTo.author.nickname}</Text>
+              </Text>
+              <TouchableOpacity onPress={handleCancelReply} style={styles.cancelReplyButton}>
+                <MaterialCommunityIcons name="close" size={16} color={colors.text.hint} />
               </TouchableOpacity>
             </View>
-          ))}
-        </ScrollView>
+          )}
+
+          {/* Text Input */}
+          <TextInput
+            style={styles.expandedTextInput}
+            placeholder="来说点什么吧！"
+            placeholderTextColor={colors.text.hint}
+            value={commentText}
+            onChangeText={setCommentText}
+            multiline
+            autoFocus
+            maxLength={500}
+          />
+
+          {/* Image preview */}
+          {commentImages.length > 0 && (
+            <ScrollView horizontal style={styles.commentImagesPreview} showsHorizontalScrollIndicator={false}>
+              {commentImages.map((image, index) => (
+                <View key={index} style={styles.commentImageWrapper}>
+                  <Image source={{ uri: image.uri }} style={styles.commentImageThumbnail} resizeMode="cover" />
+                  {image.uploading && (
+                    <View style={styles.uploadingOverlay}>
+                      <Loading size="sm" />
+                    </View>
+                  )}
+                  <TouchableOpacity
+                    style={styles.removeImageButton}
+                    onPress={() => handleRemoveCommentImage(index)}
+                  >
+                    <MaterialCommunityIcons name="close-circle" size={18} color={colors.text.primary} />
+                  </TouchableOpacity>
+                </View>
+              ))}
+            </ScrollView>
+          )}
+
+          {/* Toolbar */}
+          <View style={styles.expandedToolbar}>
+            <View style={styles.expandedToolbarLeft}>
+              <TouchableOpacity
+                style={styles.expandedToolbarItem}
+                onPress={handlePickCommentImage}
+                disabled={commentImages.length >= 3}
+              >
+                <MaterialCommunityIcons
+                  name="image-outline"
+                  size={22}
+                  color={commentImages.length >= 3 ? colors.text.disabled : colors.text.secondary}
+                />
+              </TouchableOpacity>
+              <TouchableOpacity
+                style={styles.expandedToolbarItem}
+                onPress={() => {}}
+              >
+                <MaterialCommunityIcons
+                  name="at"
+                  size={22}
+                  color={colors.text.secondary}
+                />
+              </TouchableOpacity>
+              <TouchableOpacity
+                style={styles.expandedToolbarItem}
+                onPress={() => {}}
+              >
+                <MaterialCommunityIcons
+                  name="gamepad-variant-outline"
+                  size={22}
+                  color={colors.text.secondary}
+                />
+              </TouchableOpacity>
+              <Text variant="caption" color={colors.text.hint} style={styles.expandedCharCount}>
+                {commentText.length}/500
+              </Text>
+            </View>
+
+            <TouchableOpacity
+              style={[
+                styles.expandedSendButton,
+                !(commentText.trim() || commentImages.length > 0) && styles.expandedSendButtonDisabled
+              ]}
+              onPress={handleSendComment}
+              disabled={!(commentText.trim() || commentImages.length > 0)}
+            >
+              <Text style={styles.expandedSendButtonText}>发送</Text>
+            </TouchableOpacity>
+          </View>
+        </View>
       )}
-      
-      <View style={styles.inputWrapper}>
-        {/* 图片选择按钮 */}
-        <TouchableOpacity
-          style={styles.imagePickerButton}
-          onPress={handlePickCommentImage}
-          disabled={commentImages.length >= 3}
-        >
-          <MaterialCommunityIcons
-            name="image-outline"
-            size={isDesktop ? 24 : 22}
-            color={commentImages.length >= 3 ? colors.text.disabled : colors.text.secondary}
-          />
-        </TouchableOpacity>
-        
-        <TextInput
-          style={[
-            styles.input,
-            { fontSize: isDesktop ? fontSizes.lg : fontSizes.md }
-          ]}
-          placeholder={replyingTo ? `回复 ${replyingTo.author.nickname}...` : "说点什么..."}
-          placeholderTextColor={colors.text.hint}
-          value={commentText}
-          onChangeText={setCommentText}
-          multiline
-          maxLength={500}
-        />
-        <TouchableOpacity
-          style={[
-            styles.sendButton,
-            !(commentText.trim() || commentImages.length > 0) && styles.sendButtonDisabled
-          ]}
-          onPress={handleSendComment}
-          disabled={!(commentText.trim() || commentImages.length > 0)}
-        >
-          <MaterialCommunityIcons
-            name="send"
-            size={isDesktop ? 24 : 20}
-            color={(commentText.trim() || commentImages.length > 0) ? colors.primary.main : colors.text.disabled}
-          />
-        </TouchableOpacity>
-      </View>
     </View>
   );
 
@@ -1559,20 +1609,20 @@ export const PostDetailScreen: React.FC = () => {
 
   if (!post) {
     return (
-      <SafeAreaView style={styles.container} edges={['bottom']}>
+      <View style={styles.container}>
         <EmptyState
           title="帖子不存在"
           description="该帖子可能已被删除"
           icon="alert-circle-outline"
         />
-      </SafeAreaView>
+      </View>
     );
   }
 
   // 桌面端双栏布局
   if (useDualColumnLayout) {
     return (
-      <SafeAreaView style={styles.container} edges={['bottom']}>
+      <View style={styles.container}>
         <AdaptiveLayout
           sidebar={renderSidebar()}
           sidebarWidth={sidebarWidth}
@@ -1611,13 +1661,13 @@ export const PostDetailScreen: React.FC = () => {
           onClose={() => setShowImageModal(false)}
           enableSave
         />
-      </SafeAreaView>
+      </View>
     );
   }
 
   // 移动端单栏布局
   return (
-    <SafeAreaView style={styles.container} edges={['bottom']}>
+    <View style={styles.container}>
       <KeyboardAvoidingView
         style={styles.flex}
         behavior={Platform.OS === 'ios' ? 'padding' : undefined}
@@ -1707,7 +1757,7 @@ export const PostDetailScreen: React.FC = () => {
           setReportTarget(null);
         }}
       />
-    </SafeAreaView>
+    </View>
   );
 };
 
@@ -1915,62 +1965,35 @@ function createPostDetailStyles(colors: AppColors) {
   voteLoadingText: {
     marginTop: spacing.sm,
   },
-  actionBar: {
-    flexDirection: 'row',
-    justifyContent: 'space-around',
-    paddingVertical: spacing.md,
-    borderTopWidth: StyleSheet.hairlineWidth,
-    borderTopColor: colors.divider,
-    backgroundColor: colors.background.paper,
-  },
-  actionButton: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    paddingHorizontal: spacing.md,
-    paddingVertical: spacing.xs,
-    borderRadius: borderRadius.lg,
-  },
-  actionText: {
-    fontSize: fontSizes.sm,
-    marginLeft: 6,
-    fontWeight: '500',
-  },
   commentSectionHeader: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    justifyContent: 'space-between',
-    borderTopWidth: StyleSheet.hairlineWidth,
-    borderTopColor: colors.divider,
+    flexDirection: 'column',
+    alignItems: 'flex-start',
     paddingTop: spacing.lg,
   },
-  commentSectionTitleBlock: {
-    flex: 1,
-    minWidth: 0,
-  },
   commentSectionTitleRow: {
     flexDirection: 'row',
     alignItems: 'center',
   },
   commentSectionTitle: {
-    fontWeight: '800',
+    fontWeight: '600',
     color: colors.text.primary,
-    letterSpacing: -0.2,
+    letterSpacing: 0,
   },
-  commentCountBadge: {
-    backgroundColor: colors.background.default,
-    borderWidth: StyleSheet.hairlineWidth,
-    borderColor: colors.divider,
-    paddingHorizontal: spacing.sm + 2,
-    paddingVertical: 3,
-    borderRadius: 999,
-    marginLeft: spacing.sm,
-    minWidth: 24,
-    alignItems: 'center',
+  commentSectionCount: {
+    marginLeft: spacing.xs,
+    fontSize: fontSizes.sm,
   },
-  commentCountText: {
-    fontSize: fontSizes.xs,
-    fontWeight: '700',
-    color: colors.text.secondary,
+  commentSectionUnderline: {
+    width: 28,
+    height: 3,
+    backgroundColor: colors.text.primary,
+    marginTop: spacing.xs,
+    borderRadius: borderRadius.xs,
+  },
+  commentSectionCount: {
+    marginLeft: spacing.xs,
+    fontSize: fontSizes.sm,
+    color: colors.text.hint,
   },
   inputContainer: {
     backgroundColor: colors.background.paper,
@@ -1991,29 +2014,37 @@ function createPostDetailStyles(colors: AppColors) {
     marginLeft: spacing.sm,
     padding: 2,
   },
-  inputWrapper: {
+  inputTrigger: {
+    flex: 1,
+    backgroundColor: colors.background.default,
+    borderRadius: 18,
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm + 2,
+    minHeight: 38,
+    justifyContent: 'center',
+  },
+  inputTriggerText: {
+    fontSize: fontSizes.sm,
+    color: colors.text.hint,
+  },
+  bottomComposerRow: {
     flexDirection: 'row',
     alignItems: 'center',
-    backgroundColor: colors.background.default,
-    borderRadius: 20,
-    paddingHorizontal: spacing.md,
+    gap: spacing.xs + 2,
   },
-  input: {
-    flex: 1,
-    minHeight: 40,
-    maxHeight: 100,
-    color: colors.text.primary,
-    paddingVertical: spacing.sm,
+  bottomActionItem: {
+    alignItems: 'center',
+    justifyContent: 'center',
+    paddingVertical: 2,
+    paddingHorizontal: spacing.sm + 1,
+    marginLeft: spacing.xs,
   },
-  sendButton: {
-    padding: spacing.sm,
-  },
-  sendButtonDisabled: {
-    opacity: 0.5,
-  },
-  imagePickerButton: {
-    padding: spacing.sm,
-    marginRight: spacing.xs,
+  bottomActionCount: {
+    marginTop: 1,
+    fontSize: fontSizes.xs,
+    color: colors.text.secondary,
+    lineHeight: fontSizes.xs + 2,
+    fontWeight: '500',
   },
   commentImagesPreview: {
     maxHeight: 80,
@@ -2050,6 +2081,62 @@ function createPostDetailStyles(colors: AppColors) {
     backgroundColor: colors.background.paper,
     borderRadius: 9,
   },
+  // Expanded composer styles
+  expandedComposer: {
+    backgroundColor: colors.background.paper,
+  },
+  expandedReplyHint: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: spacing.sm,
+  },
+  expandedTextInput: {
+    minHeight: 80,
+    maxHeight: 160,
+    fontSize: fontSizes.md,
+    color: colors.text.primary,
+    paddingVertical: spacing.sm,
+    textAlignVertical: 'top',
+    lineHeight: 22,
+  },
+  expandedToolbar: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    marginTop: spacing.sm,
+    paddingTop: spacing.sm,
+    borderTopWidth: StyleSheet.hairlineWidth,
+    borderTopColor: colors.divider,
+  },
+  expandedToolbarLeft: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    flex: 1,
+  },
+  expandedToolbarItem: {
+    padding: spacing.xs,
+    marginRight: spacing.sm,
+  },
+  expandedCharCount: {
+    marginLeft: 'auto',
+    marginRight: spacing.sm,
+  },
+  expandedSendButton: {
+    backgroundColor: colors.primary.main,
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+    borderRadius: borderRadius.md,
+    minWidth: 60,
+    alignItems: 'center',
+  },
+  expandedSendButtonDisabled: {
+    backgroundColor: colors.text.disabled,
+  },
+  expandedSendButtonText: {
+    color: colors.text.inverse,
+    fontSize: fontSizes.sm,
+    fontWeight: '600',
+  },
   modalContainer: {
     flex: 1,
     backgroundColor: 'rgba(0, 0, 0, 0.9)',
@@ -2074,33 +2161,33 @@ function createPostDetailStyles(colors: AppColors) {
     paddingVertical: spacing.xs,
     borderRadius: borderRadius.md,
   },
-  // 空评论状态样式（与平铺评论区一致，无卡片气泡）
+  // 空评论状态样式（类似图片中的四个方块样式）
   emptyCommentsContainer: {
     alignItems: 'center',
     justifyContent: 'center',
-    marginHorizontal: spacing.md,
-    marginTop: spacing.md,
-    marginBottom: spacing.lg,
-    paddingVertical: spacing.xl,
-    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.xl * 2.5,
   },
-  emptyCommentsIconWrapper: {
-    width: 40,
-    height: 40,
-    alignItems: 'center',
-    justifyContent: 'center',
-    marginBottom: spacing.sm,
-    opacity: 0.85,
+  emptyCommentsGrid: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    width: 48,
+    height: 48,
+    marginBottom: spacing.md,
   },
-  emptyCommentsTitle: {
-    fontSize: fontSizes.md,
-    fontWeight: '500',
-    color: colors.text.primary,
-    marginBottom: spacing.xs,
+  emptyCommentsGridItem: {
+    width: 20,
+    height: 20,
+    backgroundColor: colors.background.disabled,
+    margin: 2,
+    borderRadius: borderRadius.xs,
+  },
+  emptyCommentsGridItemActive: {
+    backgroundColor: colors.text.hint,
   },
   emptyCommentsSubtitle: {
     fontSize: fontSizes.sm,
     textAlign: 'center',
+    color: colors.text.hint,
   },
   // 侧边栏样式
   sidebar: {