diff --git a/backend/app/routers/conversations.py b/backend/app/routers/conversations.py
index 7f22be3..0c5c7ba 100644
--- a/backend/app/routers/conversations.py
+++ b/backend/app/routers/conversations.py
@@ -10,6 +10,8 @@ from app.schemas.conversation import (
     GroupCreate, GroupUpdate, MemberAdd, RoleUpdate,
 )
 from app.services.conversation_service import ConversationService
+from app.websocket.events import EventType
+from app.websocket.manager import manager
 
 router = APIRouter()
 
@@ -97,6 +99,16 @@ async def add_members(
     service = ConversationService(db)
     try:
         await service.add_members(conversation_id, user.id, req.user_ids)
+        # 通知新成员被加入群聊
+        detail = await service.get_conversation_detail(conversation_id, user.id)
+        group_name = detail.get("name", "群聊") if detail else "群聊"
+        for mid in req.user_ids:
+            await manager.send_to_user(mid, EventType.CONVERSATION_MEMBER_ADDED, {
+                "conversation_id": conversation_id,
+                "group_name": group_name,
+                "added_by_user_id": user.id,
+                "added_by_username": user.username,
+            })
         return {"success": True, "message": "成员已添加"}
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
@@ -113,6 +125,12 @@ async def remove_member(
     service = ConversationService(db)
     try:
         await service.remove_member(conversation_id, user.id, target_user_id)
+        # 通知被移除的用户
+        await manager.send_to_user(target_user_id, EventType.CONVERSATION_MEMBER_REMOVED, {
+            "conversation_id": conversation_id,
+            "removed_by_user_id": user.id,
+            "removed_by_username": user.username,
+        })
         return {"success": True, "message": "成员已移除"}
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
@@ -133,6 +151,21 @@ async def leave_group(
         raise HTTPException(status_code=400, detail=str(e))
 
 
+@router.post("/{conversation_id}/dissolve")
+async def dissolve_group(
+    conversation_id: str,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """解散群聊（仅群主）"""
+    service = ConversationService(db)
+    try:
+        await service.dissolve_group(conversation_id, user.id)
+        return {"success": True, "message": "群聊已解散"}
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
 @router.put("/{conversation_id}/members/{target_user_id}/role")
 async def update_member_role(
     conversation_id: str,
diff --git a/backend/app/routers/friends.py b/backend/app/routers/friends.py
index 160faa0..8a48ec1 100644
--- a/backend/app/routers/friends.py
+++ b/backend/app/routers/friends.py
@@ -7,6 +7,8 @@ from app.dependencies import get_db, get_current_user
 from app.models.user import User
 from app.schemas.friend import FriendRequestCreate, FriendRead, FriendRequestRead, RemarkUpdate
 from app.services.friend_service import FriendService
+from app.websocket.events import EventType
+from app.websocket.manager import manager
 
 router = APIRouter()
 
@@ -41,6 +43,14 @@ async def send_friend_request(
     service = FriendService(db)
     try:
         await service.send_request(user.id, req.to_user_id, req.message)
+        # 通知接收者
+        await manager.send_to_user(req.to_user_id, EventType.FRIEND_REQUEST, {
+            "from_user_id": user.id,
+            "from_username": user.username,
+            "from_nickname": user.nickname,
+            "from_avatar": user.avatar_url,
+            "message": req.message,
+        })
         return {"success": True, "message": "好友请求已发送"}
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
@@ -86,7 +96,24 @@ async def accept_friend_request(
     """接受好友请求"""
     service = FriendService(db)
     try:
+        # Get request details before accepting to know who sent it
+        request = await service.get_pending_requests(user.id)
+        from_user_id = None
+        for r in request:
+            if r["id"] == request_id:
+                from_user_id = r["from_user_id"]
+                break
+
         await service.accept_request(request_id, user.id)
+
+        # Notify the requester that their request was accepted
+        if from_user_id:
+            await manager.send_to_user(from_user_id, EventType.FRIEND_ACCEPTED, {
+                "accepted_by_user_id": user.id,
+                "accepted_by_username": user.username,
+                "accepted_by_nickname": user.nickname,
+            })
+
         return {"success": True, "message": "已添加好友"}
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
diff --git a/backend/app/schemas/message.py b/backend/app/schemas/message.py
index d636d20..bc18e18 100644
--- a/backend/app/schemas/message.py
+++ b/backend/app/schemas/message.py
@@ -21,6 +21,8 @@ class MessageRead(BaseModel):
     type: str
     content: str
     reply_to_id: str | None = None
+    reply_to_content: str | None = None
+    reply_to_sender_name: str | None = None
     is_deleted: bool = False
     created_at: datetime
 
diff --git a/backend/app/services/conversation_service.py b/backend/app/services/conversation_service.py
index ce40d9c..c482daf 100644
--- a/backend/app/services/conversation_service.py
+++ b/backend/app/services/conversation_service.py
@@ -115,6 +115,33 @@ class ConversationService:
             raise ValueError("群主不能退出，请先转让群主身份")
         member.left_at = datetime.utcnow()
 
+    async def dissolve_group(self, conv_id: str, user_id: str):
+        """解散群聊（仅群主）"""
+        member = await self._get_member(conv_id, user_id)
+        if not member:
+            raise ValueError("你不在该群中")
+        if member.role != "owner":
+            raise ValueError("只有群主可以解散群聊")
+
+        # 验证会话存在且为群聊
+        conv_result = await self.db.execute(
+            select(Conversation).where(Conversation.id == conv_id)
+        )
+        conv = conv_result.scalars().first()
+        if not conv or conv.type != "group":
+            raise ValueError("群聊不存在")
+
+        # 软删除所有成员（设置 left_at）
+        members_result = await self.db.execute(
+            select(ConversationMember).where(
+                ConversationMember.conversation_id == conv_id,
+                ConversationMember.left_at.is_(None),
+            )
+        )
+        now = datetime.utcnow()
+        for m in members_result.scalars().all():
+            m.left_at = now
+
     async def update_member_role(self, conv_id: str, user_id: str, target_user_id: str, role: str):
         """修改成员角色（仅群主）"""
         member = await self._get_member(conv_id, user_id)
diff --git a/backend/app/services/message_service.py b/backend/app/services/message_service.py
index fa95d91..0110e29 100644
--- a/backend/app/services/message_service.py
+++ b/backend/app/services/message_service.py
@@ -85,6 +85,23 @@ class MessageService:
                 select(User).where(User.id == msg.sender_id)
             )
             sender = sender_result.scalars().first()
+
+            # 获取被引用消息的信息
+            reply_to_content = None
+            reply_to_sender_name = None
+            if msg.reply_to_id:
+                reply_msg_result = await self.db.execute(
+                    select(Message).where(Message.id == msg.reply_to_id)
+                )
+                reply_msg = reply_msg_result.scalars().first()
+                if reply_msg:
+                    reply_to_content = reply_msg.content[:200] if reply_msg.content else None
+                    reply_sender_result = await self.db.execute(
+                        select(User).where(User.id == reply_msg.sender_id)
+                    )
+                    reply_sender = reply_sender_result.scalars().first()
+                    reply_to_sender_name = reply_sender.username if reply_sender else None
+
             message_list.append({
                 "id": msg.id,
                 "conversation_id": msg.conversation_id,
@@ -94,6 +111,8 @@ class MessageService:
                 "type": msg.type,
                 "content": msg.content,
                 "reply_to_id": msg.reply_to_id,
+                "reply_to_content": reply_to_content,
+                "reply_to_sender_name": reply_to_sender_name,
                 "is_deleted": msg.is_deleted,
                 "created_at": msg.created_at,
             })
diff --git a/backend/app/websocket/handlers.py b/backend/app/websocket/handlers.py
index 4fd0163..980d80f 100644
--- a/backend/app/websocket/handlers.py
+++ b/backend/app/websocket/handlers.py
@@ -4,6 +4,7 @@ import json
 from datetime import datetime, timezone
 
 from fastapi import WebSocket
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.websocket.events import EventType
@@ -34,6 +35,20 @@ async def handle_chat_send(ws: WebSocket, user_id: str, data: dict, db: AsyncSes
         conv_service = ConversationService(db)
         detail = await conv_service.get_conversation_detail(data["conversation_id"], user_id)
 
+        # 获取被引用消息的信息
+        reply_to_content = None
+        reply_to_sender_name = None
+        if message.reply_to_id:
+            from app.models.message import Message
+            reply_msg_result = await db.execute(
+                select(Message).where(Message.id == message.reply_to_id)
+            )
+            reply_msg = reply_msg_result.scalars().first()
+            if reply_msg:
+                reply_to_content = reply_msg.content[:200] if reply_msg.content else None
+                reply_sender = await user_service.get_by_id(reply_msg.sender_id)
+                reply_to_sender_name = reply_sender.username if reply_sender else None
+
         msg_data = {
             "id": message.id,
             "conversation_id": message.conversation_id,
@@ -42,6 +57,9 @@ async def handle_chat_send(ws: WebSocket, user_id: str, data: dict, db: AsyncSes
             "sender_avatar": sender.avatar_url if sender else None,
             "type": message.type,
             "content": message.content,
+            "reply_to_id": message.reply_to_id,
+            "reply_to_content": reply_to_content,
+            "reply_to_sender_name": reply_to_sender_name,
             "created_at": message.created_at.isoformat(),
         }
 
diff --git a/frontend/src/api/chat.ts b/frontend/src/api/chat.ts
index 46e7924..bd96f00 100644
--- a/frontend/src/api/chat.ts
+++ b/frontend/src/api/chat.ts
@@ -11,7 +11,7 @@ export const chatApi = {
 
   getConversationDetail: (id: string) => api.get(`/conversations/${id}`),
 
-  updateGroup: (id: string, data: { name?: string; description?: string }) =>
+  updateGroup: (id: string, data: { name?: string; description?: string; avatar_url?: string }) =>
     api.put(`/conversations/${id}`, data),
 
   addMembers: (convId: string, userIds: string[]) =>
@@ -23,6 +23,9 @@ export const chatApi = {
   leaveGroup: (convId: string) =>
     api.post(`/conversations/${convId}/leave`),
 
+  dissolveGroup: (convId: string) =>
+    api.post(`/conversations/${convId}/dissolve`),
+
   getMessages: (conversationId: string, before?: string, limit = 50) => {
     const params: Record<string, any> = { limit }
     if (before) params.before = before
diff --git a/frontend/src/composables/useWebSocket.ts b/frontend/src/composables/useWebSocket.ts
index b191234..d711541 100644
--- a/frontend/src/composables/useWebSocket.ts
+++ b/frontend/src/composables/useWebSocket.ts
@@ -11,6 +11,7 @@ const maxReconnectAttempts = 10
 // 共享状态
 const connected = ref(false)
 const onlineUsers = ref(new Map<string, boolean>())
+const typingUsers = ref(new Map<string, { username: string; timeout: ReturnType<typeof setTimeout> }>())
 
 export function useWebSocket() {
 
@@ -80,11 +81,37 @@ export function useWebSocket() {
         onlineUsers.value.set(event.data.user_id, false)
         console.log(`用户 ${event.data.user_id} 下线`)
         break
+      case 'chat.typing':
+        if (event.data.conversation_id && event.data.username) {
+          const key = `${event.data.conversation_id}:${event.data.user_id}`
+          const existing = typingUsers.value.get(key)
+          if (existing) clearTimeout(existing.timeout)
+          typingUsers.value.set(key, {
+            username: event.data.username,
+            timeout: setTimeout(() => typingUsers.value.delete(key), 3000),
+          })
+        }
+        break
       case 'friend.request':
         console.log('收到好友请求:', event.data)
         // 通过自定义事件通知全局
         window.dispatchEvent(new CustomEvent('qingye:friend-request', { detail: event.data }))
         break
+      case 'friend.accepted':
+        console.log('好友请求已被接受:', event.data)
+        window.dispatchEvent(new CustomEvent('qingye:friend-accepted', { detail: event.data }))
+        break
+      case 'conversation.member_added':
+        console.log('被加入群聊:', event.data)
+        window.dispatchEvent(new CustomEvent('qingye:member-added', { detail: event.data }))
+        // 刷新会话列表
+        chatStore.fetchConversations()
+        break
+      case 'conversation.member_removed':
+        console.log('被移出群聊:', event.data)
+        window.dispatchEvent(new CustomEvent('qingye:member-removed', { detail: event.data }))
+        chatStore.fetchConversations()
+        break
       case 'error':
         console.error('服务端错误:', event.data.message)
         break
@@ -95,5 +122,5 @@ export function useWebSocket() {
     return onlineUsers.value.get(userId) === true
   }
 
-  return { connected, onlineUsers, connect, disconnect, send, isUserOnline }
+  return { connected, onlineUsers, typingUsers, connect, disconnect, send, isUserOnline }
 }
diff --git a/frontend/src/layouts/UnifiedLayout.vue b/frontend/src/layouts/UnifiedLayout.vue
index 02a87fc..10998a4 100644
--- a/frontend/src/layouts/UnifiedLayout.vue
+++ b/frontend/src/layouts/UnifiedLayout.vue
@@ -49,6 +49,7 @@
 <script setup lang="ts">
 import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { useRoute } from 'vue-router'
+import { useMessage } from 'naive-ui'
 import { useAuthStore } from '@/stores/auth'
 import { useChatStore } from '@/stores/chat'
 import { useUiStore } from '@/stores/ui'
@@ -59,6 +60,7 @@ const route = useRoute()
 const auth = useAuthStore()
 const chatStore = useChatStore()
 const uiStore = useUiStore()
+const naiveMsg = useMessage()
 const { connect, connected: wsConnected } = useWebSocket()
 
 const isMobile = computed(() => uiStore.isMobile)
@@ -68,8 +70,29 @@ const hideSecondary = computed(() => {
 
 const pendingRequestCount = ref(0)
 
-function onFriendRequest() {
+function onFriendRequest(e: Event) {
   pendingRequestCount.value++
+  const detail = (e as CustomEvent).detail
+  const name = detail?.from_nickname || detail?.from_username || '有人'
+  naiveMsg.info(`${name} 请求添加你为好友`)
+}
+
+function onFriendAccepted(e: Event) {
+  const detail = (e as CustomEvent).detail
+  const name = detail?.accepted_by_nickname || detail?.accepted_by_username || '好友'
+  naiveMsg.success(`${name} 已接受你的好友请求`)
+}
+
+function onMemberAdded(e: Event) {
+  const detail = (e as CustomEvent).detail
+  const groupName = detail?.group_name || '群聊'
+  naiveMsg.info(`你被加入群聊「${groupName}」`)
+}
+
+function onMemberRemoved(e: Event) {
+  const detail = (e as CustomEvent).detail
+  const name = detail?.removed_by_username || '管理员'
+  naiveMsg.warning(`你被 ${name} 移出了群聊`)
 }
 
 const activeFeature = computed(() => {
@@ -89,6 +112,9 @@ const totalUnread = computed(() =>
 
 onMounted(async () => {
   window.addEventListener('qingye:friend-request', onFriendRequest)
+  window.addEventListener('qingye:friend-accepted', onFriendAccepted)
+  window.addEventListener('qingye:member-added', onMemberAdded)
+  window.addEventListener('qingye:member-removed', onMemberRemoved)
   try {
     await auth.fetchProfile()
   } catch {
@@ -101,6 +127,9 @@ onMounted(async () => {
 
 onUnmounted(() => {
   window.removeEventListener('qingye:friend-request', onFriendRequest)
+  window.removeEventListener('qingye:friend-accepted', onFriendAccepted)
+  window.removeEventListener('qingye:member-added', onMemberAdded)
+  window.removeEventListener('qingye:member-removed', onMemberRemoved)
 })
 
 async function loadPendingRequests() {
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index af71c82..8df8167 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -71,7 +71,7 @@ const routes: RouteRecordRaw[] = [
         path: 'moments',
         name: 'Moments',
         components: {
-          secondary: () => import('@/views/moments/MomentsFeedView.vue'),
+          secondary: () => import('@/views/moments/MomentsSidebar.vue'),
           default: () => import('@/views/moments/MomentsFeedView.vue'),
         },
       },
diff --git a/frontend/src/views/chat/ChatRoomView.vue b/frontend/src/views/chat/ChatRoomView.vue
index 1163443..80869a4 100644
--- a/frontend/src/views/chat/ChatRoomView.vue
+++ b/frontend/src/views/chat/ChatRoomView.vue
@@ -8,7 +8,8 @@
       </div>
       <div class="header-info">
         <span class="room-name">{{ conversationName }}</span>
-        <span v-if="convDetail?.type === 'group'" class="member-count">{{ convDetail.members?.length || 0 }} 位成员</span>
+        <span v-if="typingText" class="typing-indicator">{{ typingText }}</span>
+        <span v-else-if="convDetail?.type === 'group'" class="member-count">{{ convDetail.members?.length || 0 }} 位成员</span>
         <span v-else class="member-count" :class="{ online: isOtherOnline }">{{ isOtherOnline ? '在线' : '离线' }}</span>
       </div>
       <n-button v-if="convDetail?.type === 'group'" quaternary size="small" @click="showGroupInfo = !showGroupInfo">群信息 ▾</n-button>
@@ -29,6 +30,7 @@
           <p class="no-msg-hint">发送第一条消息</p>
         </div>
         <div v-for="(msg, idx) in allDisplayMessages" :key="msg.id || 'pending-' + idx"
+          :data-msg-id="msg.id"
           class="message-row" :class="{
             own: msg.sender_id === auth.user?.id, other: msg.sender_id !== auth.user?.id,
             pending: msg._pending, failed: msg._failed,
@@ -45,7 +47,13 @@
               <div v-if="msg.sender_id !== auth.user?.id && convDetail?.type === 'group'" class="sender-name">{{ msg.sender_name }}</div>
               <div class="bubble" :class="{ 'bubble-self': msg.sender_id === auth.user?.id, 'bubble-other': msg.sender_id !== auth.user?.id }"
                 @contextmenu.prevent="onMsgContext($event, msg)">
-                <img v-if="msg.type === 'image'" :src="msg.content" class="msg-image" @click="previewImage(msg.content)" />
+                <!-- 引用消息块 -->
+                <div v-if="msg.reply_to_id" class="reply-quote" @click.stop="scrollToMsg(msg.reply_to_id)">
+                  <span class="reply-quote-author">{{ msg.reply_to_sender_name || '用户' }}</span>
+                  <span class="reply-quote-text">{{ msg.reply_to_content || '消息不可用' }}</span>
+                </div>
+                <n-image v-if="msg.type === 'image'" :src="msg.content"
+                  :img-props="{ style: 'max-width:240px;border-radius:10px;display:block;cursor:pointer' }" />
                 <span v-else>{{ msg.content }}</span>
               </div>
               <div class="msg-meta">
@@ -64,6 +72,7 @@
 
       <!-- 右键菜单 -->
       <div v-if="ctxMenu.show" class="ctx-menu" :style="{ top: ctxMenu.y + 'px', left: ctxMenu.x + 'px' }">
+        <div class="ctx-item" @click="replyToMsg">↩️ 回复</div>
         <div class="ctx-item" @click="copyMsg">📋 复制</div>
         <div v-if="ctxMenu.msg?.sender_id === auth.user?.id && !ctxMenu.msg?._pending" class="ctx-item danger" @click="deleteMsg">🗑️ 删除</div>
       </div>
@@ -75,6 +84,14 @@
 
     <!-- 输入框 -->
     <div class="input-bar">
+      <!-- 回复预览条 -->
+      <div v-if="replyingTo" class="reply-bar">
+        <div class="reply-bar-content">
+          <span class="reply-bar-label">回复 {{ replyingTo.sender_name || '用户' }}</span>
+          <span class="reply-bar-text">{{ (replyingTo.content || '').slice(0, 60) }}{{ (replyingTo.content || '').length > 60 ? '...' : '' }}</span>
+        </div>
+        <span class="reply-bar-close" @click="cancelReply">✕</span>
+      </div>
       <div class="input-actions">
         <span class="action-icon" @click="showEmoji = !showEmoji">😊</span>
         <span class="action-icon" @click="triggerImageUpload">🖼️</span>
@@ -108,7 +125,7 @@ const route = useRoute()
 const chatStore = useChatStore()
 const auth = useAuthStore()
 const uiStore = useUiStore()
-const { send, connected } = useWebSocket()
+const { send, connected, typingUsers } = useWebSocket()
 
 const inputText = ref('')
 const messageListRef = ref<HTMLElement>()
@@ -118,8 +135,31 @@ const convDetail = ref<any>(null)
 const showGroupInfo = ref(false)
 const showEmoji = ref(false)
 const isOtherOnline = ref(false)
+const replyingTo = ref<any>(null)
+const lastTypingSent = ref(0)
 const emojis = EMOJIS
 
+// Typing indicator: get users typing in current conversation
+const currentTypingUsers = computed(() => {
+  const convId = route.params.id as string
+  if (!convId) return []
+  const users: string[] = []
+  typingUsers.value.forEach((val, key) => {
+    if (key.startsWith(convId + ':') && val.username) {
+      users.push(val.username)
+    }
+  })
+  return users
+})
+
+const typingText = computed(() => {
+  const users = currentTypingUsers.value
+  if (users.length === 0) return ''
+  if (users.length === 1) return `${users[0]} 正在输入...`
+  if (users.length === 2) return `${users[0]} 和 ${users[1]} 正在输入...`
+  return `${users[0]} 等 ${users.length} 人正在输入...`
+})
+
 // All messages for display (real + optimistic pending)
 const allDisplayMessages = computed(() => chatStore.allMessages())
 
@@ -199,6 +239,17 @@ watch(() => chatStore.pendingMessages.length, () => {
   nextTick(scrollToBottom)
 })
 
+// Send typing event when user types (throttled to once per 2 seconds)
+watch(inputText, () => {
+  const convId = chatStore.activeConversation
+  if (!convId || !inputText.value.trim()) return
+  const now = Date.now()
+  if (now - lastTypingSent.value > 2000) {
+    lastTypingSent.value = now
+    send('chat.typing', { conversation_id: convId })
+  }
+})
+
 function scrollToBottom() {
   if (messageListRef.value) {
     messageListRef.value.scrollTop = messageListRef.value.scrollHeight
@@ -212,6 +263,8 @@ function sendMessage() {
   inputText.value = ''
   showEmoji.value = false
 
+  const replyToId = replyingTo.value?.id || null
+
   // Add optimistic pending message
   const tempId = 'temp-' + Date.now()
   chatStore.addPendingMessage({
@@ -221,11 +274,44 @@ function sendMessage() {
     sender_name: auth.user?.nickname || auth.user?.username,
     content: text,
     type: 'text',
+    reply_to_id: replyToId,
+    reply_to_content: replyingTo.value?.content?.slice(0, 200) || null,
+    reply_to_sender_name: replyingTo.value?.sender_name || null,
     created_at: new Date().toISOString(),
   })
 
   // Send via WebSocket
-  send('chat.send', { conversation_id: chatStore.activeConversation, content: text, type: 'text' })
+  send('chat.send', {
+    conversation_id: chatStore.activeConversation,
+    content: text,
+    type: 'text',
+    reply_to_id: replyToId,
+  })
+
+  // Clear reply state
+  replyingTo.value = null
+}
+
+function replyToMsg() {
+  if (ctxMenu.msg) {
+    replyingTo.value = { ...ctxMenu.msg }
+  }
+  ctxMenu.show = false
+}
+
+function cancelReply() {
+  replyingTo.value = null
+}
+
+function scrollToMsg(msgId: string) {
+  const el = messageListRef.value
+  if (!el) return
+  const target = el.querySelector(`[data-msg-id="${msgId}"]`)
+  if (target) {
+    target.scrollIntoView({ behavior: 'smooth', block: 'center' })
+    target.classList.add('highlight')
+    setTimeout(() => target.classList.remove('highlight'), 1500)
+  }
 }
 
 function insertEmoji(e: string) {
@@ -308,6 +394,8 @@ function formatTimeDivider(time: string) {
 .member-count { font-size: 12px; color: var(--color-text-hint); }
 .member-count.online { color: var(--color-success); }
 .member-count.online::before { content: ''; display: inline-block; width: 6px; height: 6px; background: var(--color-success); border-radius: 50%; margin-right: 4px; }
+.typing-indicator { font-size: 12px; color: var(--color-primary); font-style: italic; animation: typing-fade 1.5s ease infinite; }
+@keyframes typing-fade { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
 
 .chat-body { flex: 1; display: flex; overflow: hidden; position: relative; }
 .message-list { flex: 1; overflow-y: auto; padding: 16px 20px; }
@@ -347,6 +435,37 @@ function formatTimeDivider(time: string) {
 .msg-image { max-width: 240px; border-radius: 10px; display: block; cursor: pointer; }
 .system-msg { text-align: center; font-size: 12px; color: var(--color-text-hint); margin: 12px 0; padding: 4px 16px; background: rgba(0,0,0,0.03); border-radius: 12px; display: inline-block; }
 
+/* Reply quote inside bubble */
+.reply-quote {
+  padding: 6px 10px; margin-bottom: 6px; border-radius: 6px;
+  background: rgba(0,0,0,0.06); border-left: 3px solid var(--color-primary);
+  cursor: pointer; font-size: 12px; line-height: 1.4;
+}
+.bubble-self .reply-quote { background: rgba(255,255,255,0.2); border-left-color: rgba(255,255,255,0.6); }
+.reply-quote-author { font-weight: 600; color: var(--color-primary); display: block; margin-bottom: 2px; }
+.bubble-self .reply-quote-author { color: rgba(255,255,255,0.9); }
+.reply-quote-text { color: var(--color-text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
+.bubble-self .reply-quote-text { color: rgba(255,255,255,0.7); }
+
+/* Highlight animation for scrollToMsg */
+.message-row.highlight .bubble { animation: highlight-pulse 1.5s ease; }
+@keyframes highlight-pulse {
+  0%, 100% { box-shadow: none; }
+  30% { box-shadow: 0 0 0 3px var(--color-primary-lighter); }
+}
+
+/* Reply bar above input */
+.reply-bar {
+  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
+  background: var(--color-primary-lightest); border-radius: 8px; margin-bottom: 6px;
+  border-left: 3px solid var(--color-primary);
+}
+.reply-bar-content { flex: 1; min-width: 0; }
+.reply-bar-label { display: block; font-size: 12px; font-weight: 600; color: var(--color-primary); }
+.reply-bar-text { display: block; font-size: 12px; color: var(--color-text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.reply-bar-close { cursor: pointer; color: var(--color-text-hint); font-size: 14px; padding: 2px; }
+.reply-bar-close:hover { color: var(--color-text-primary); }
+
 /* Context menu */
 .ctx-menu { position: fixed; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 8px; box-shadow: 0 4px 16px rgba(0,0,0,0.12); z-index: 999; min-width: 120px; overflow: hidden; }
 .ctx-item { padding: 8px 16px; font-size: 13px; cursor: pointer; transition: background 0.15s; }
diff --git a/frontend/src/views/chat/GroupInfoPanel.vue b/frontend/src/views/chat/GroupInfoPanel.vue
index a32af2d..58052f8 100644
--- a/frontend/src/views/chat/GroupInfoPanel.vue
+++ b/frontend/src/views/chat/GroupInfoPanel.vue
@@ -7,9 +7,14 @@
     <div v-if="detail" class="panel-body">
       <!-- 群头像和名称 -->
       <div class="group-header">
-        <n-avatar :size="64" round :style="{ background: 'var(--color-primary)', fontSize: '24px' }">
-          {{ (detail.name || '群')[0] }}
-        </n-avatar>
+        <div class="avatar-upload-wrap" :class="{ clickable: isAdmin }" @click="isAdmin && triggerAvatarUpload()">
+          <n-avatar v-if="detail.avatar_url" :src="detail.avatar_url" :size="64" round />
+          <n-avatar v-else :size="64" round :style="{ background: 'var(--color-primary)', fontSize: '24px' }">
+            {{ (detail.name || '群')[0] }}
+          </n-avatar>
+          <div v-if="isAdmin" class="avatar-overlay">📷</div>
+        </div>
+        <input ref="avatarInput" type="file" accept="image/*" style="display:none" @change="handleAvatarUpload" />
         <div class="group-meta">
           <span class="group-name">{{ detail.name || '未命名群聊' }}</span>
           <span class="group-desc">{{ detail.description || '暂无简介' }}</span>
@@ -48,18 +53,51 @@
 
       <!-- 操作按钮 -->
       <div class="section actions">
-        <n-button v-if="isOwner" type="error" ghost block>解散群聊</n-button>
+        <n-button v-if="isOwner" type="error" ghost block @click="dissolveGroup">解散群聊</n-button>
         <n-button v-else type="error" ghost block @click="leaveGroup">退出群聊</n-button>
       </div>
     </div>
+
+    <!-- 添加成员弹窗 -->
+    <div v-if="showAddMember" class="modal-overlay" @click.self="showAddMember = false">
+      <div class="add-member-modal">
+        <div class="modal-header">
+          <h3>添加群成员</h3>
+          <span class="close-btn" @click="showAddMember = false">✕</span>
+        </div>
+        <div class="modal-body">
+          <div v-if="availableFriends.length === 0" class="empty-friends">
+            <p>没有可添加的好友</p>
+          </div>
+          <div v-for="friend in availableFriends" :key="friend.friend_user_id" class="friend-select-item">
+            <n-avatar :size="32" round :style="{ background: 'var(--color-primary)' }">
+              {{ (friend.remark || friend.nickname || friend.username || '?')[0] }}
+            </n-avatar>
+            <span class="friend-select-name">{{ friend.remark || friend.nickname || friend.username }}</span>
+            <n-checkbox :checked="selectedNewMembers.includes(friend.friend_user_id)"
+              @update:checked="toggleSelectMember(friend.friend_user_id)" />
+          </div>
+        </div>
+        <div class="modal-footer">
+          <n-button size="small" @click="showAddMember = false">取消</n-button>
+          <n-button size="small" type="primary" :disabled="selectedNewMembers.length === 0"
+            :loading="addingMembers" @click="addMembers">确认添加 ({{ selectedNewMembers.length }})</n-button>
+        </div>
+      </div>
+    </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import { ref, computed, watch } from 'vue'
+import { useRouter } from 'vue-router'
 import { useMessage } from 'naive-ui'
 import { useAuthStore } from '@/stores/auth'
 import { chatApi } from '@/api/chat'
+import { friendsApi } from '@/api/friends'
+import api from '@/api/client'
+
+const router = useRouter()
 
 const props = defineProps<{ conversationId: string; detail: any }>()
 const emit = defineEmits<{ close: []; updated: [] }>()
@@ -68,6 +106,10 @@ const auth = useAuthStore()
 const message = useMessage()
 const editName = ref('')
 const showAddMember = ref(false)
+const friends = ref<any[]>([])
+const selectedNewMembers = ref<string[]>([])
+const addingMembers = ref(false)
+const avatarInput = ref<HTMLInputElement>()
 
 const myRole = computed(() => {
   const me = props.detail?.members?.find((m: any) => m.user_id === auth.user?.id)
@@ -80,6 +122,68 @@ watch(() => props.detail, (d) => {
   if (d) editName.value = d.name || ''
 }, { immediate: true })
 
+// Load friends when add member modal opens
+watch(showAddMember, async (val) => {
+  if (val) {
+    selectedNewMembers.value = []
+    try {
+      const { data } = await friendsApi.getFriends()
+      friends.value = data
+    } catch {}
+  }
+})
+
+// Friends not already in the group
+const availableFriends = computed(() => {
+  const memberIds = new Set((props.detail?.members || []).map((m: any) => m.user_id))
+  return friends.value.filter((f: any) => !memberIds.has(f.friend_user_id))
+})
+
+function toggleSelectMember(userId: string) {
+  const idx = selectedNewMembers.value.indexOf(userId)
+  if (idx === -1) {
+    selectedNewMembers.value.push(userId)
+  } else {
+    selectedNewMembers.value.splice(idx, 1)
+  }
+}
+
+async function addMembers() {
+  if (selectedNewMembers.value.length === 0) return
+  addingMembers.value = true
+  try {
+    await chatApi.addMembers(props.conversationId, selectedNewMembers.value)
+    message.success('成员已添加')
+    showAddMember.value = false
+    emit('updated')
+  } catch (e: any) {
+    message.error(e.response?.data?.detail || '添加失败')
+  } finally {
+    addingMembers.value = false
+  }
+}
+
+function triggerAvatarUpload() {
+  avatarInput.value?.click()
+}
+
+async function handleAvatarUpload(event: Event) {
+  const target = event.target as HTMLInputElement
+  const file = target.files?.[0]
+  if (!file) return
+  try {
+    const formData = new FormData()
+    formData.append('file', file)
+    const { data } = await api.post('/uploads/file', formData, { headers: { 'Content-Type': 'multipart/form-data' } })
+    await chatApi.updateGroup(props.conversationId, { avatar_url: data.url })
+    message.success('群头像已更新')
+    emit('updated')
+  } catch (e: any) {
+    message.error(e.response?.data?.detail || '上传失败')
+  }
+  target.value = ''
+}
+
 function roleLabel(role: string) {
   if (role === 'owner') return '群主'
   if (role === 'admin') return '管理员'
@@ -115,6 +219,18 @@ async function leaveGroup() {
     message.error(e.response?.data?.detail || '退出失败')
   }
 }
+
+async function dissolveGroup() {
+  if (!confirm('确定要解散该群聊吗？此操作不可恢复。')) return
+  try {
+    await chatApi.dissolveGroup(props.conversationId)
+    message.success('群聊已解散')
+    emit('close')
+    router.push('/chat')
+  } catch (e: any) {
+    message.error(e.response?.data?.detail || '解散失败')
+  }
+}
 </script>
 
 <style scoped>
@@ -133,6 +249,13 @@ async function leaveGroup() {
 .panel-body { flex: 1; overflow-y: auto; padding: 16px; }
 .group-header { text-align: center; margin-bottom: 20px; }
 .group-meta { margin-top: 8px; }
+.avatar-upload-wrap { position: relative; display: inline-block; }
+.avatar-upload-wrap.clickable { cursor: pointer; }
+.avatar-overlay {
+  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
+  background: rgba(0,0,0,0.3); border-radius: 50%; opacity: 0; transition: opacity 0.2s; font-size: 20px;
+}
+.avatar-upload-wrap.clickable:hover .avatar-overlay { opacity: 1; }
 .group-name { font-size: 18px; font-weight: 600; display: block; }
 .group-desc { font-size: 13px; color: var(--color-text-secondary); display: block; margin-top: 4px; }
 .member-count { font-size: 12px; color: var(--color-text-hint); display: block; margin-top: 2px; }
@@ -153,4 +276,31 @@ async function leaveGroup() {
 .member-role.owner { background: #FFF3E0; color: #F57C00; }
 .member-role.admin { background: #E3F2FD; color: #1976D2; }
 .actions { padding-top: 12px; border-top: 1px solid var(--color-border); }
+
+/* Add member modal */
+.modal-overlay {
+  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
+  display: flex; align-items: center; justify-content: center; z-index: 1000;
+}
+.add-member-modal {
+  width: 400px; max-height: 500px; background: var(--color-surface); border-radius: 16px;
+  box-shadow: 0 12px 40px rgba(0,0,0,0.15); display: flex; flex-direction: column;
+}
+.add-member-modal .modal-header {
+  display: flex; justify-content: space-between; align-items: center;
+  padding: 20px 24px 16px; border-bottom: 1px solid var(--color-border);
+}
+.add-member-modal .modal-header h3 { margin: 0; font-size: 18px; }
+.modal-body { flex: 1; overflow-y: auto; padding: 12px 16px; }
+.modal-footer {
+  display: flex; justify-content: flex-end; gap: 8px;
+  padding: 12px 24px; border-top: 1px solid var(--color-border);
+}
+.empty-friends { text-align: center; padding: 30px; color: var(--color-text-hint); font-size: 13px; }
+.friend-select-item {
+  display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 8px;
+  cursor: pointer; transition: background 0.15s;
+}
+.friend-select-item:hover { background: var(--color-primary-lightest); }
+.friend-select-name { flex: 1; font-size: 14px; }
 </style>
diff --git a/frontend/src/views/moments/MomentCard.vue b/frontend/src/views/moments/MomentCard.vue
index d143ba6..edebe91 100644
--- a/frontend/src/views/moments/MomentCard.vue
+++ b/frontend/src/views/moments/MomentCard.vue
@@ -1,6 +1,6 @@
 <template>
   <div class="moment-card">
-    <!-- 头部：头像 + 用户名 + 时间 -->
+    <!-- 头部：头像 + 用户名 + 时间 + 删除 -->
     <div class="moment-header">
       <n-avatar :size="40" round :style="{ background: 'var(--color-primary)' }">
         {{ (moment.nickname || moment.username || '?')[0] }}
@@ -9,17 +9,21 @@
         <span class="author-name">{{ moment.nickname || moment.username }}</span>
         <span class="post-time">{{ formatTime(moment.created_at) }}</span>
       </div>
+      <span v-if="isMine" class="delete-btn" title="删除" @click="handleDelete">🗑️</span>
     </div>
 
     <!-- 内容 -->
     <div class="moment-content">{{ moment.content }}</div>
 
     <!-- 图片 -->
-    <div v-if="moment.images && moment.images.length > 0" class="moment-images" :class="`grid-${Math.min(moment.images.length, 3)}`">
-      <div v-for="(img, i) in moment.images" :key="i" class="image-item">
-        <img :src="img" :alt="`图片${i + 1}`" />
+    <n-image-group v-if="moment.images && moment.images.length > 0">
+      <div class="moment-images" :class="`grid-${Math.min(moment.images.length, 3)}`">
+        <div v-for="(img, i) in moment.images" :key="i" class="image-item">
+          <n-image :src="img" :alt="`图片${i + 1}`" object-fit="cover"
+            :img-props="{ style: 'width:100%;height:100%;object-fit:cover' }" />
+        </div>
       </div>
-    </div>
+    </n-image-group>
 
     <!-- 操作栏 -->
     <div class="moment-actions">
@@ -35,25 +39,35 @@
     <div v-if="showComments" class="comments-section">
       <div v-if="comments.length > 0" class="comments-list">
         <div v-for="comment in comments" :key="comment.id" class="comment-item">
-          <span class="comment-author">{{ comment.nickname || comment.username }}</span>
-          <span v-if="comment.reply_to_username" class="comment-reply">
-            回复 <span class="comment-author">{{ comment.reply_to_username }}</span>
-          </span>
-          <span class="comment-text">：{{ comment.content }}</span>
+          <div class="comment-content-row">
+            <span class="comment-author">{{ comment.nickname || comment.username }}</span>
+            <span v-if="comment.reply_to_username" class="comment-reply">
+              回复 <span class="comment-author">{{ comment.reply_to_username }}</span>
+            </span>
+            <span class="comment-text">：{{ comment.content }}</span>
+            <span class="comment-reply-btn" @click="setReplyTarget(comment)">回复</span>
+          </div>
         </div>
       </div>
-      <div class="comment-input">
-        <n-input v-model:value="commentText" placeholder="写评论..." size="small"
-          @keydown.enter.prevent="submitComment" />
-        <n-button size="tiny" type="primary" :disabled="!commentText.trim()" @click="submitComment">发送</n-button>
+      <div class="comment-input-wrapper">
+        <div v-if="replyTarget" class="reply-indicator">
+          <span>回复 @{{ replyTarget.nickname || replyTarget.username }}</span>
+          <span class="reply-cancel" @click="replyTarget = null">✕</span>
+        </div>
+        <div class="comment-input">
+          <n-input v-model:value="commentText" :placeholder="replyTarget ? `回复 @${replyTarget.nickname || replyTarget.username}...` : '写评论...'" size="small"
+            @keydown.enter.prevent="submitComment" />
+          <n-button size="tiny" type="primary" :disabled="!commentText.trim()" @click="submitComment">发送</n-button>
+        </div>
       </div>
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
-import { ref, watch } from 'vue'
+import { ref, computed, watch } from 'vue'
 import { momentsApi } from '@/api/moments'
+import { useAuthStore } from '@/stores/auth'
 import dayjs from 'dayjs'
 import relativeTime from 'dayjs/plugin/relativeTime'
 import 'dayjs/locale/zh-cn'
@@ -65,11 +79,16 @@ const props = defineProps<{ moment: any }>()
 const emit = defineEmits<{
   'toggle-like': [momentId: string]
   'comment': [momentId: string, content: string]
+  'delete': [momentId: string]
 }>()
 
+const auth = useAuthStore()
 const showComments = ref(false)
 const comments = ref<any[]>([])
 const commentText = ref('')
+const replyTarget = ref<any>(null)
+
+const isMine = computed(() => props.moment.user_id === auth.user?.id)
 
 watch(showComments, async (val) => {
   if (val && comments.value.length === 0) {
@@ -80,13 +99,26 @@ watch(showComments, async (val) => {
   }
 })
 
+function setReplyTarget(comment: any) {
+  replyTarget.value = comment
+}
+
+async function handleDelete() {
+  if (!confirm('确定要删除这条动态吗？')) return
+  try {
+    emit('delete', props.moment.id)
+  } catch {}
+}
+
 async function submitComment() {
   if (!commentText.value.trim()) return
   try {
-    const { data } = await momentsApi.addComment(props.moment.id, commentText.value.trim())
+    const replyToId = replyTarget.value?.id || undefined
+    const { data } = await momentsApi.addComment(props.moment.id, commentText.value.trim(), replyToId)
     comments.value.push(data)
     emit('comment', props.moment.id, commentText.value.trim())
     commentText.value = ''
+    replyTarget.value = null
   } catch {}
 }
 
@@ -110,6 +142,12 @@ function formatTime(time: string) {
   border: 1px solid var(--color-border);
 }
 .moment-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
+.delete-btn {
+  margin-left: auto; font-size: 14px; cursor: pointer;
+  opacity: 0; transition: opacity 0.2s; padding: 4px;
+}
+.moment-card:hover .delete-btn { opacity: 0.6; }
+.delete-btn:hover { opacity: 1 !important; }
 .header-info { display: flex; flex-direction: column; }
 .author-name { font-weight: 600; font-size: 14px; }
 .post-time { font-size: 11px; color: var(--color-text-hint); }
@@ -124,7 +162,7 @@ function formatTime(time: string) {
 .moment-images.grid-2 { grid-template-columns: 1fr 1fr; }
 .moment-images.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
 .image-item { aspect-ratio: 1; overflow: hidden; border-radius: 6px; cursor: pointer; }
-.image-item img { width: 100%; height: 100%; object-fit: cover; }
+.image-item :deep(img) { width: 100%; height: 100%; object-fit: cover; }
 
 .moment-actions {
   display: flex; gap: 16px; padding-top: 8px;
@@ -143,9 +181,24 @@ function formatTime(time: string) {
   font-size: 13px; padding: 4px 0; line-height: 1.5;
   color: var(--color-text-primary);
 }
+.comment-content-row { display: inline; }
 .comment-author { color: var(--color-primary); font-weight: 500; cursor: pointer; }
 .comment-reply { color: var(--color-text-hint); }
 .comment-text { color: var(--color-text-primary); }
+.comment-reply-btn {
+  font-size: 11px; color: var(--color-text-hint); cursor: pointer;
+  margin-left: 6px; opacity: 0; transition: opacity 0.2s;
+}
+.comment-item:hover .comment-reply-btn { opacity: 1; }
+.comment-reply-btn:hover { color: var(--color-primary); }
 
-.comment-input { display: flex; gap: 6px; margin-top: 6px; }
+.comment-input-wrapper { margin-top: 6px; }
+.reply-indicator {
+  display: flex; align-items: center; justify-content: space-between;
+  padding: 4px 8px; margin-bottom: 4px; background: var(--color-primary-lightest);
+  border-radius: 6px; font-size: 12px; color: var(--color-primary);
+}
+.reply-cancel { cursor: pointer; font-size: 12px; padding: 2px; }
+.reply-cancel:hover { color: var(--color-text-primary); }
+.comment-input { display: flex; gap: 6px; }
 </style>
diff --git a/frontend/src/views/moments/MomentsFeedView.vue b/frontend/src/views/moments/MomentsFeedView.vue
index 09bd628..b34dde2 100644
--- a/frontend/src/views/moments/MomentsFeedView.vue
+++ b/frontend/src/views/moments/MomentsFeedView.vue
@@ -30,6 +30,7 @@
           :moment="moment"
           @toggle-like="handleToggleLike"
           @comment="handleComment"
+          @delete="handleDelete"
         />
       </div>
 
@@ -156,6 +157,15 @@ async function handleComment(momentId: string, content: string) {
     message.error('评论失败')
   }
 }
+
+async function handleDelete(momentId: string) {
+  try {
+    await momentsStore.deleteMoment(momentId)
+    message.success('已删除')
+  } catch {
+    message.error('删除失败')
+  }
+}
 </script>
 
 <style scoped>
diff --git a/frontend/src/views/moments/MomentsSidebar.vue b/frontend/src/views/moments/MomentsSidebar.vue
new file mode 100644
index 0000000..73563a7
--- /dev/null
+++ b/frontend/src/views/moments/MomentsSidebar.vue
@@ -0,0 +1,67 @@
+<template>
+  <div class="moments-sidebar">
+    <div class="panel-header">
+      <h3 class="panel-title">朋友圈</h3>
+    </div>
+    <div class="sidebar-content">
+      <div class="sidebar-intro">
+        <div class="intro-icon">🌿</div>
+        <p class="intro-text">分享你的生活点滴</p>
+      </div>
+      <div class="sidebar-stats">
+        <div class="stat-item">
+          <span class="stat-value">{{ momentsStore.feed.length }}</span>
+          <span class="stat-label">动态</span>
+        </div>
+      </div>
+      <div class="sidebar-tips">
+        <div class="tip-item" @click="showCompose = true">
+          <span class="tip-icon">✏️</span>
+          <span class="tip-text">发布新动态</span>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useMomentsStore } from '@/stores/moments'
+
+const momentsStore = useMomentsStore()
+const showCompose = ref(false)
+</script>
+
+<style scoped>
+.moments-sidebar {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+.panel-header {
+  padding: 16px;
+  border-bottom: 1px solid var(--color-border);
+}
+.panel-title { margin: 0; font-size: 16px; font-weight: 600; }
+.sidebar-content { flex: 1; padding: 16px; }
+.sidebar-intro {
+  text-align: center; padding: 30px 16px; margin-bottom: 16px;
+  background: var(--color-primary-lightest); border-radius: 12px;
+}
+.intro-icon { font-size: 36px; margin-bottom: 8px; }
+.intro-text { font-size: 14px; color: var(--color-text-secondary); margin: 0; }
+.sidebar-stats {
+  display: flex; justify-content: center; gap: 24px; margin-bottom: 20px;
+}
+.stat-item { text-align: center; }
+.stat-value { display: block; font-size: 20px; font-weight: 600; color: var(--color-primary); }
+.stat-label { font-size: 12px; color: var(--color-text-hint); }
+.sidebar-tips { margin-top: 16px; }
+.tip-item {
+  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
+  border-radius: 8px; cursor: pointer; transition: background 0.15s;
+}
+.tip-item:hover { background: var(--color-primary-lightest); }
+.tip-icon { font-size: 16px; }
+.tip-text { font-size: 14px; color: var(--color-text-primary); }
+</style>