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+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>VideoCall - 一对一视频通话</title>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
+    <style>
+        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
+
+        body {
+            font-family: 'Inter', sans-serif;
+            background: #0f172a;
+            overflow: hidden;
+        }
+
+        .bg-grid {
+            background-image:
+                linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
+                linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
+            background-size: 40px 40px;
+            animation: gridMove 20s linear infinite;
+        }
+
+        @keyframes gridMove {
+            0% { transform: translate(0, 0); }
+            100% { transform: translate(40px, 40px); }
+        }
+
+        .glass {
+            background: rgba(30, 41, 59, 0.7);
+            backdrop-filter: blur(12px);
+            -webkit-backdrop-filter: blur(12px);
+            border: 1px solid rgba(255, 255, 255, 0.1);
+        }
+
+        .glass-strong {
+            background: rgba(15, 23, 42, 0.9);
+            backdrop-filter: blur(20px);
+            -webkit-backdrop-filter: blur(20px);
+        }
+
+        .control-btn {
+            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .control-btn:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
+        }
+
+        .end-call-pulse {
+            animation: pulse-red 2s infinite;
+        }
+
+        @keyframes pulse-red {
+            0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
+            50% { box-shadow: 0 0 0 15px rgba(239, 68, 68, 0); }
+        }
+
+        .chat-bubble {
+            animation: messageSlide 0.3s ease-out;
+        }
+
+        @keyframes messageSlide {
+            from { opacity: 0; transform: translateX(-10px); }
+            to { opacity: 1; transform: translateX(0); }
+        }
+
+        .custom-scrollbar::-webkit-scrollbar {
+            width: 6px;
+        }
+        .custom-scrollbar::-webkit-scrollbar-track {
+            background: rgba(255, 255, 255, 0.05);
+        }
+        .custom-scrollbar::-webkit-scrollbar-thumb {
+            background: rgba(255, 255, 255, 0.2);
+            border-radius: 3px;
+        }
+
+        .audio-wave {
+            display: flex;
+            align-items: center;
+            gap: 3px;
+            height: 20px;
+        }
+
+        .audio-wave span {
+            width: 3px;
+            background: #10b981;
+            border-radius: 2px;
+            animation: wave 1s ease-in-out infinite;
+        }
+
+        .audio-wave span:nth-child(1) { animation-delay: 0s; height: 40%; }
+        .audio-wave span:nth-child(2) { animation-delay: 0.1s; height: 70%; }
+        .audio-wave span:nth-child(3) { animation-delay: 0.2s; height: 100%; }
+        .audio-wave span:nth-child(4) { animation-delay: 0.3s; height: 60%; }
+        .audio-wave span:nth-child(5) { animation-delay: 0.4s; height: 30%; }
+
+        @keyframes wave {
+            0%, 100% { transform: scaleY(0.5); }
+            50% { transform: scaleY(1); }
+        }
+
+        .video-fade-in {
+            animation: videoFadeIn 0.5s ease-out;
+        }
+
+        @keyframes videoFadeIn {
+            from { opacity: 0; transform: scale(1.05); }
+            to { opacity: 1; transform: scale(1); }
+        }
+
+        /* 数据绑定标记 - 开发调试时显示 */
+        [data-field]::after {
+            content: attr(data-field);
+            position: absolute;
+            top: -18px;
+            right: 0;
+            background: #f59e0b;
+            color: #000;
+            font-size: 9px;
+            padding: 1px 4px;
+            border-radius: 3px;
+            opacity: 0;
+            transition: opacity 0.2s;
+            pointer-events: none;
+            z-index: 1000;
+            white-space: nowrap;
+        }
+        [data-field]:hover::after { opacity: 1; }
+        [data-field] { position: relative; }
+    </style>
+</head>
+<body class="h-screen w-screen flex flex-col text-white bg-grid relative">
+
+    <!--
+    ============================================================
+    数据模型定义 (Data Models)
+    ============================================================
+
+    1. CallSession 通话会话
+    interface CallSession {
+        id: string;                    // 通话唯一ID [PRIMARY_KEY]
+        type: 'video' | 'audio';       // 通话类型
+        status: 'connecting' | 'ongoing' | 'ended' | 'failed';
+        startTime: string;             // ISO 8601 格式
+        duration: number;              // 已进行秒数
+        isEncrypted: boolean;          // 是否端到端加密
+        localUser: LocalUser;          // 本地用户信息
+        remoteUser: RemoteUser;        // 远端用户信息
+    }
+
+    2. LocalUser 本地用户
+    interface LocalUser {
+        id: string;                    // 用户ID
+        name: string;                  // 显示名称
+        avatar: string;                // 头像URL
+        isHost: boolean;               // 是否主持人
+        mediaState: MediaState;        // 媒体状态
+    }
+
+    3. RemoteUser 远端用户
+    interface RemoteUser {
+        id: string;                    // 用户ID
+        name: string;                  // 显示名称
+        avatar: string;                // 头像URL
+        status: 'online' | 'offline' | 'connecting';
+        mediaState: MediaState;        // 媒体状态
+        networkQuality: 'excellent' | 'good' | 'fair' | 'poor';  // 网络质量
+    }
+
+    4. MediaState 媒体状态
+    interface MediaState {
+        audio: boolean;                // 音频是否开启
+        video: boolean;                // 视频是否开启
+        screenShare: boolean;          // 是否屏幕共享
+        isSpeaking: boolean;           // 是否正在说话(VAD检测)
+    }
+
+    5. ChatMessage 聊天消息
+    interface ChatMessage {
+        id: string;                    // 消息ID
+        senderId: string;              // 发送者ID
+        senderName: string;            // 发送者名称
+        senderAvatar: string;          // 发送者头像
+        content: string;               // 消息内容
+        type: 'text' | 'file' | 'system';
+        timestamp: string;             // ISO 8601 格式
+        isSelf: boolean;               // 是否自己发送
+    }
+
+    ============================================================
+    API 接口定义 (API Endpoints)
+    ============================================================
+
+    [GET]    /api/call/:callId        // 获取通话信息
+    [POST]   /api/call/:callId/join   // 加入通话
+    [POST]   /api/call/:callId/leave  // 离开通话
+    [POST]   /api/call/:callId/media  // 更新媒体状态 {audio?: boolean, video?: boolean}
+    [GET]    /api/call/:callId/messages?limit=50&before=timestamp  // 获取历史消息
+    [POST]   /api/call/:callId/message // 发送消息 {content: string, type: 'text'}
+
+    WebSocket Events:
+    - connect:              连接建立
+    - disconnect:           连接断开
+    - user-joined:          {userId, timestamp}
+    - user-left:            {userId, timestamp}
+    - media-state-changed:  {userId, audio, video, screenShare, isSpeaking}
+    - message-received:     {message: ChatMessage}
+    - network-quality:      {userId, quality: 'excellent' | 'good' | 'fair' | 'poor'}
+    - call-ended:           {reason: 'user_hangup' | 'network_error' | 'timeout'}
+    -->
+
+    <!--
+    ============================================================
+    区域: 顶部栏 (Header)
+    数据源: CallSession
+    更新频率: 实时 (WebSocket + 本地计时器)
+    ============================================================
+    -->
+    <header class="glass-strong h-16 flex items-center justify-between px-6 z-50 border-b border-white/10">
+        <div class="flex items-center gap-3">
+            <div class="w-10 h-10 bg-gradient-to-br from-indigo-500 to-purple-600 rounded-xl flex items-center justify-center shadow-lg">
+                <i class="fas fa-video text-white text-lg"></i>
+            </div>
+            <div>
+                <!-- [DATA_FIELD: callSession.remoteUser.name] [TYPE: string] [REQUIRED] -->
+                <h1 class="font-bold text-lg tracking-tight" data-field="remoteUser.name" id="headerTitle">
+                    与 Sarah 的通话
+                </h1>
+                <div class="flex items-center gap-2 text-xs text-gray-400">
+                    <span class="w-2 h-2 bg-green-500 rounded-full animate-pulse"></span>
+                    <!-- [DATA_FIELD: callSession.duration] [TYPE: string] [FORMAT: MM:SS] [UPDATE: 每秒] -->
+                    <span data-field="callSession.duration" id="callDuration">00:00</span>
+                </div>
+            </div>
+        </div>
+
+        <div class="flex items-center gap-4">
+            <!-- [CONDITIONAL_RENDER: callSession.isEncrypted === true] -->
+            <div class="hidden md:flex items-center gap-2 px-4 py-2 glass rounded-full text-sm" id="encryptionBadge">
+                <i class="fas fa-shield-alt text-green-400"></i>
+                <span class="text-gray-300">端到端加密</span>
+            </div>
+
+            <button class="w-10 h-10 rounded-full glass flex items-center justify-center hover:bg-white/10 transition-colors relative" onclick="toggleSidebar()">
+                <i class="fas fa-comment-alt text-gray-300"></i>
+                <!-- [DATA_FIELD: unreadCount] [TYPE: number] [DEFAULT: 0] [CONDITION: >0] -->
+                <span id="unreadBadge" class="absolute -top-1 -right-1 w-5 h-5 bg-red-500 rounded-full text-xs flex items-center justify-center hidden" data-field="unreadCount">0</span>
+            </button>
+        </div>
+    </header>
+
+    <main class="flex-1 flex overflow-hidden relative">
+
+        <!--
+        ============================================================
+        区域: 视频区域 (Video Area)
+        数据源: CallSession.remoteUser (对方) + CallSession.localUser (自己)
+        更新频率: 实时 (WebRTC MediaStream + WebSocket 状态)
+        ============================================================
+        -->
+        <div class="flex-1 relative bg-black/40 overflow-hidden" id="videoArea">
+
+            <!--
+            子区域: 远端视频 (Remote Video)
+            数据源: RemoteUser
+            -->
+            <div class="absolute inset-0 video-fade-in">
+                <!-- [DATA_FIELD: remoteUser.videoStream] [TYPE: MediaStream | null] [BIND: srcObject] -->
+                <!-- [FALLBACK: remoteUser.avatar] [TYPE: string] [URL] -->
+                <img id="remoteVideo"
+                     src="https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=1280&h=720&fit=crop"
+                     alt="对方视频"
+                     class="w-full h-full object-cover"
+                     data-field="remoteUser.videoStream">
+
+                <!-- 远端信息覆盖层 -->
+                <div class="absolute top-6 left-6 glass px-4 py-2 rounded-full flex items-center gap-3">
+                    <div class="relative">
+                        <!-- [DATA_FIELD: remoteUser.avatar] [TYPE: string] [URL] [REQUIRED] -->
+                        <img id="remoteAvatar"
+                             src="https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=100&h=100&fit=crop"
+                             class="w-8 h-8 rounded-full object-cover"
+                             data-field="remoteUser.avatar">
+
+                        <!-- [CONDITIONAL_RENDER: remoteUser.mediaState.isSpeaking === true] -->
+                        <div id="remoteSpeakingIndicator" class="absolute -bottom-1 -right-1 w-3 h-3 bg-green-500 rounded-full border-2 border-slate-900 hidden" data-field="remoteUser.isSpeaking"></div>
+                    </div>
+                    <div>
+                        <!-- [DATA_FIELD: remoteUser.name] [TYPE: string] -->
+                        <div class="text-sm font-medium" data-field="remoteUser.name" id="remoteName">Sarah Chen</div>
+                        <div class="text-xs text-gray-400 flex items-center gap-2">
+                            <!-- [DATA_FIELD: remoteUser.status] [TYPE: string] [ENUM: online/offline/connecting] -->
+                            <span id="remoteStatus" data-field="remoteUser.status">正在通话</span>
+
+                            <!-- [CONDITIONAL_RENDER: remoteUser.mediaState.isSpeaking === true && remoteUser.mediaState.audio === true] -->
+                            <div id="remoteAudioWave" class="audio-wave w-6 hidden" data-field="remoteUser.audioActivity">
+                                <span></span><span></span><span></span><span></span><span></span>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- 网络状态提示 -->
+                <!-- [CONDITIONAL_RENDER: remoteUser.networkQuality !== 'excellent'] -->
+                <div id="networkStatus" class="absolute top-6 right-6 glass px-3 py-1.5 rounded-full flex items-center gap-2 text-xs hidden" data-field="remoteUser.networkQuality">
+                    <i class="fas fa-exclamation-triangle text-yellow-500"></i>
+                    <!-- [DATA_FIELD: remoteUser.networkQuality] [TYPE: string] [TRANSFORM: quality => text] -->
+                    <span class="text-gray-300" id="networkStatusText">网络不稳定</span>
+                </div>
+
+                <!-- 连接中/重连提示 -->
+                <!-- [CONDITIONAL_RENDER: callSession.status === 'connecting'] -->
+                <div id="connectingOverlay" class="absolute inset-0 bg-black/60 flex items-center justify-center hidden" data-field="callSession.status">
+                    <div class="text-center">
+                        <div class="w-12 h-12 border-4 border-indigo-500 border-t-transparent rounded-full animate-spin mx-auto mb-3"></div>
+                        <p class="text-white font-medium">正在连接...</p>
+                        <p class="text-sm text-gray-400 mt-1" id="connectingText">等待对方接受邀请</p>
+                    </div>
+                </div>
+            </div>
+
+            <!--
+            子区域: 本地视频 (Local Video - Picture in Picture)
+            数据源: LocalUser
+            -->
+            <div class="absolute bottom-6 right-6 w-64 h-48 rounded-2xl overflow-hidden shadow-2xl border-2 border-white/20 video-fade-in z-10">
+                <!-- [DATA_FIELD: localUser.videoStream] [TYPE: MediaStream | null] [BIND: srcObject] -->
+                <!-- [FALLBACK: localUser.avatar] [TYPE: string] [URL] -->
+                <img id="localVideo"
+                     src="https://images.unsplash.com/photo-1507003211169-0a1dd7228f2d?w=400&h=300&fit=crop"
+                     alt="本地视频"
+                     class="w-full h-full object-cover"
+                     data-field="localUser.videoStream">
+
+                <!-- [CONDITIONAL_RENDER: localUser.mediaState.video === false] -->
+                <div id="localVideoPlaceholder" class="absolute inset-0 flex items-center justify-center bg-gradient-to-br from-indigo-900 to-purple-900 hidden" data-field="localUser.videoOff">
+                    <span class="text-4xl font-bold" id="localInitials">我</span>
+                </div>
+
+                <div class="absolute bottom-3 left-3 glass px-2 py-1 rounded text-xs flex items-center gap-2">
+                    <span>我</span>
+                    <!-- [CONDITIONAL_RENDER: localUser.mediaState.isSpeaking === true] -->
+                    <div id="localAudioWave" class="audio-wave w-4 hidden" data-field="localUser.isSpeaking">
+                        <span></span><span></span><span></span>
+                    </div>
+                </div>
+
+                <!-- 本地视频悬停控制 -->
+                <div class="absolute inset-0 bg-black/40 opacity-0 hover:opacity-100 transition-opacity flex items-center justify-center gap-2">
+                    <button onclick="toggleLocalVideo()" class="w-8 h-8 rounded-full bg-white/20 hover:bg-white/30 flex items-center justify-center transition-colors">
+                        <i class="fas fa-video text-xs" id="localVideoIcon"></i>
+                    </button>
+                </div>
+            </div>
+
+        </div>
+
+        <!--
+        ============================================================
+        区域: 侧边栏 (Sidebar)
+        数据源: ChatMessage[] + User[]
+        更新频率: 实时 (WebSocket)
+        ============================================================
+        -->
+        <aside class="w-80 glass-strong border-l border-white/10 flex flex-col hidden" id="sidebar">
+
+            <!--
+            子区域: 用户列表 (User List)
+            数据源: [localUser, remoteUser]
+            -->
+            <div class="p-4 border-b border-white/10">
+                <h3 class="text-sm font-medium text-gray-400 mb-3">
+                    通话成员 (<!-- [DATA_FIELD: userCount] [TYPE: number] [VALUE: 2] -->2)
+                </h3>
+                <div class="space-y-2" id="userList">
+                    <!-- [LOOP_START: users as user] -->
+
+                    <!-- 远端用户项 -->
+                    <div class="flex items-center gap-3 p-2 rounded-lg bg-white/5" data-user-id="remote">
+                        <div class="relative">
+                            <!-- [DATA_FIELD: remoteUser.avatar] -->
+                            <img src="https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=100&h=100&fit=crop"
+                                 class="w-10 h-10 rounded-full object-cover"
+                                 data-field="remoteUser.avatar">
+                            <!-- [CONDITIONAL_RENDER: remoteUser.status === 'online'] -->
+                            <div class="absolute -bottom-1 -right-1 w-3 h-3 bg-green-500 rounded-full border-2 border-slate-900"></div>
+                        </div>
+                        <div class="flex-1">
+                            <!-- [DATA_FIELD: remoteUser.name] -->
+                            <div class="text-sm font-medium" data-field="remoteUser.name">Sarah Chen</div>
+                            <!-- [DATA_FIELD: remoteUser.status] [TRANSFORM: status => displayText] -->
+                            <div class="text-xs text-green-400" data-field="remoteUser.statusText">在线</div>
+                        </div>
+                        <!-- [CONDITIONAL_RENDER: remoteUser.mediaState.isSpeaking === true] -->
+                        <div class="audio-wave w-6" data-field="remoteUser.speakingIndicator">
+                            <span></span><span></span><span></span><span></span><span></span>
+                        </div>
+                    </div>
+
+                    <!-- 本地用户项 -->
+                    <div class="flex items-center gap-3 p-2 rounded-lg hover:bg-white/5" data-user-id="local">
+                        <!-- [DATA_FIELD: localUser.avatar] -->
+                        <img src="https://images.unsplash.com/photo-1507003211169-0a1dd7228f2d?w=100&h=100&fit=crop"
+                             class="w-10 h-10 rounded-full object-cover"
+                             data-field="localUser.avatar">
+                        <div class="flex-1">
+                            <div class="text-sm font-medium">
+                                <!-- [DATA_FIELD: localUser.name] -->我
+                                <!-- [CONDITIONAL_RENDER: localUser.isHost === true] -->
+                                <span class="text-xs bg-indigo-500 px-1.5 rounded ml-1">主持人</span>
+                            </div>
+                            <!-- [DATA_FIELD: localUser.mediaState] [TRANSFORM: state => statusText] -->
+                            <div class="text-xs text-gray-500" id="localMediaStatus" data-field="localUser.mediaStatus">静音中</div>
+                        </div>
+                        <!-- [CONDITIONAL_RENDER: localUser.mediaState.audio === false] -->
+                        <i class="fas fa-microphone-slash text-gray-500 text-xs" data-field="localUser.muteIcon"></i>
+                    </div>
+
+                    <!-- [LOOP_END: users] -->
+                </div>
+            </div>
+
+            <!--
+            子区域: 聊天消息列表 (Chat Messages)
+            数据源: ChatMessage[]
+            排序: 按 timestamp 升序
+            -->
+            <div class="flex-1 overflow-y-auto p-4 space-y-4 custom-scrollbar" id="chatContent">
+                <!-- [STATIC] 通话开始时间 -->
+                <div class="text-center text-xs text-gray-500 my-4">
+                    通话开始 <!-- [DATA_FIELD: callSession.startTime] [FORMAT: HH:MM] -->14:30
+                </div>
+
+                <!-- [LOOP_START: messages as message] -->
+
+                <!-- 消息模板 (对方) -->
+                <!-- [CONDITIONAL_RENDER: message.isSelf === false] -->
+                <div class="chat-bubble" data-message-id="${message.id}">
+                    <div class="flex gap-3">
+                        <!-- [DATA_FIELD: message.senderAvatar] -->
+                        <img src="https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=100&h=100&fit=crop"
+                             class="w-8 h-8 rounded-full object-cover"
+                             data-field="message.senderAvatar">
+                        <div class="flex-1">
+                            <div class="flex items-baseline gap-2 mb-1">
+                                <!-- [DATA_FIELD: message.senderName] -->
+                                <span class="text-sm font-medium text-indigo-400" data-field="message.senderName">Sarah Chen</span>
+                                <!-- [DATA_FIELD: message.timestamp] [FORMAT: HH:MM] -->
+                                <span class="text-xs text-gray-500" data-field="message.time">14:32</span>
+                            </div>
+                            <!-- [DATA_FIELD: message.content] -->
+                            <div class="glass px-3 py-2 rounded-2xl rounded-tl-none text-sm text-gray-200" data-field="message.content">
+                                嗨，能听到我说话吗？
+                            </div>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- 消息模板 (自己) -->
+                <!-- [CONDITIONAL_RENDER: message.isSelf === true] -->
+                <div class="chat-bubble">
+                    <div class="flex gap-3 flex-row-reverse">
+                        <!-- [DATA_FIELD: message.senderAvatar] -->
+                        <img src="https://images.unsplash.com/photo-1507003211169-0a1dd7228f2d?w=100&h=100&fit=crop"
+                             class="w-8 h-8 rounded-full object-cover"
+                             data-field="message.senderAvatar">
+                        <div class="flex-1 flex flex-col items-end">
+                            <div class="flex items-baseline gap-2 mb-1 flex-row-reverse">
+                                <span class="text-sm font-medium text-green-400">我</span>
+                                <span class="text-xs text-gray-500" data-field="message.time">14:32</span>
+                            </div>
+                            <div class="bg-indigo-600 px-3 py-2 rounded-2xl rounded-tr-none text-sm text-white" data-field="message.content">
+                                很清楚！你的画面也很清晰 👍
+                            </div>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- [LOOP_END: messages] -->
+            </div>
+
+            <!--
+            子区域: 消息输入 (Message Input)
+            API: [POST] /api/call/:callId/message
+            -->
+            <div class="p-4 border-t border-white/10">
+                <div class="glass rounded-2xl flex items-center gap-2 p-2">
+                    <button class="w-8 h-8 rounded-full hover:bg-white/10 flex items-center justify-center text-gray-400 transition-colors">
+                        <i class="fas fa-plus"></i>
+                    </button>
+                    <!-- [INPUT_FIELD] [BIND: inputValue] [EVENT: onEnter => sendMessage()] -->
+                    <input type="text"
+                           id="chatInput"
+                           placeholder="输入消息..."
+                           class="flex-1 bg-transparent border-none outline-none text-sm text-white placeholder-gray-500 px-2"
+                           data-field="chatInput"
+                           onkeypress="handleChatSubmit(event)">
+                    <!-- [BUTTON] [EVENT: onclick => sendMessage()] -->
+                    <button onclick="sendMessage()" class="w-8 h-8 rounded-full bg-indigo-600 hover:bg-indigo-700 flex items-center justify-center transition-colors">
+                        <i class="fas fa-paper-plane text-xs"></i>
+                    </button>
+                </div>
+            </div>
+        </aside>
+
+    </main>
+
+    <!--
+    ============================================================
+    区域: 底部控制栏 (Control Bar)
+    数据源: LocalUser.mediaState
+    API: [POST] /api/call/:callId/media
+    WebSocket: emit 'media-state-changed'
+    ============================================================
+    -->
+    <footer class="glass-strong h-20 border-t border-white/10 flex items-center justify-center px-6 gap-4 z-50">
+
+        <!-- 左侧连接信息 -->
+        <div class="absolute left-6 hidden md:flex items-center gap-3">
+            <div class="text-left">
+                <div class="text-sm font-medium">一对一通话</div>
+                <!-- [DATA_FIELD: remoteUser.networkQuality] [TRANSFORM: quality => displayText] -->
+                <div class="text-xs text-gray-400" id="connectionQuality" data-field="connectionQualityText">
+                    连接质量: 优秀
+                </div>
+            </div>
+        </div>
+
+        <!-- 中间控制按钮组 -->
+        <div class="flex items-center gap-3">
+
+            <!-- 麦克风控制 -->
+            <!-- [DATA_FIELD: localUser.mediaState.audio] [TYPE: boolean] -->
+            <button class="control-btn w-12 h-12 rounded-full glass flex items-center justify-center text-white hover:bg-white/10 relative group"
+                    onclick="toggleMute(this)"
+                    id="micBtn"
+                    data-field="localUser.audio"
+                    data-active="false">
+                <i class="fas fa-microphone text-lg" data-icon="default"></i>
+                <i class="fas fa-microphone-slash text-lg hidden text-red-400" data-icon="active"></i>
+                <span class="absolute -top-10 left-1/2 transform -translate-x-1/2 px-2 py-1 bg-black/80 rounded text-xs whitespace-nowrap opacity-0 group-hover:opacity-100 transition-opacity">
+                    静音 (Space)
+                </span>
+            </button>
+
+            <!-- 摄像头控制 -->
+            <!-- [DATA_FIELD: localUser.mediaState.video] [TYPE: boolean] -->
+            <button class="control-btn w-12 h-12 rounded-full glass flex items-center justify-center text-white hover:bg-white/10 relative group"
+                    onclick="toggleVideo(this)"
+                    id="videoBtn"
+                    data-field="localUser.video"
+                    data-active="false">
+                <i class="fas fa-video text-lg" data-icon="default"></i>
+                <i class="fas fa-video-slash text-lg hidden text-red-400" data-icon="active"></i>
+                <span class="absolute -top-10 left-1/2 transform -translate-x-1/2 px-2 py-1 bg-black/80 rounded text-xs whitespace-nowrap opacity-0 group-hover:opacity-100 transition-opacity">
+                    关闭视频 (Ctrl+V)
+                </span>
+            </button>
+
+            <!-- 屏幕共享控制 -->
+            <!-- [DATA_FIELD: localUser.mediaState.screenShare] [TYPE: boolean] -->
+            <button class="control-btn w-12 h-12 rounded-full glass flex items-center justify-center text-white hover:bg-white/10 relative group"
+                    onclick="toggleScreenShare(this)"
+                    id="screenBtn"
+                    data-field="localUser.screenShare"
+                    data-active="false">
+                <i class="fas fa-desktop text-lg" data-icon="default"></i>
+                <i class="fas fa-stop-circle text-lg hidden text-green-400" data-icon="active"></i>
+                <span class="absolute -top-10 left-1/2 transform -translate-x-1/2 px-2 py-1 bg-black/80 rounded text-xs whitespace-nowrap opacity-0 group-hover:opacity-100 transition-opacity">
+                    共享屏幕
+                </span>
+            </button>
+
+            <!-- 更多选项 -->
+            <button class="control-btn w-12 h-12 rounded-full glass flex items-center justify-center text-white hover:bg-white/10 relative group">
+                <i class="fas fa-ellipsis-h text-lg"></i>
+                <span class="absolute -top-10 left-1/2 transform -translate-x-1/2 px-2 py-1 bg-black/80 rounded text-xs whitespace-nowrap opacity-0 group-hover:opacity-100 transition-opacity">
+                    更多选项
+                </span>
+            </button>
+
+            <!-- 结束通话 -->
+            <!-- [EVENT: onclick => endCall()] [API: POST /api/call/:callId/leave] -->
+            <button class="control-btn w-14 h-14 rounded-full bg-red-500 hover:bg-red-600 flex items-center justify-center text-white end-call-pulse ml-4 relative group"
+                    onclick="endCall()">
+                <i class="fas fa-phone-slash text-xl"></i>
+                <span class="absolute -top-10 left-1/2 transform -translate-x-1/2 px-2 py-1 bg-black/80 rounded text-xs whitespace-nowrap opacity-0 group-hover:opacity-100 transition-opacity">
+                    结束通话
+                </span>
+            </button>
+        </div>
+
+        <!-- 右侧聊天按钮 -->
+        <div class="absolute right-6 flex items-center gap-3">
+            <button class="control-btn w-10 h-10 rounded-full glass flex items-center justify-center text-gray-300 hover:text-white hover:bg-white/10 transition-colors" onclick="toggleSidebar()">
+                <i class="fas fa-comment-alt"></i>
+            </button>
+        </div>
+
+    </footer>
+
+    <!-- 通知组件 -->
+    <div id="notification" class="fixed top-20 left-1/2 transform -translate-x-1/2 glass px-6 py-3 rounded-full flex items-center gap-3 opacity-0 pointer-events-none transition-all duration-300 z-50 translate-y-[-20px]">
+        <i class="fas fa-info-circle text-indigo-400"></i>
+        <span class="text-sm" id="notificationText">通知内容</span>
+    </div>
+
+    <!--
+    ============================================================
+    数据层与逻辑层 (Data & Logic Layer)
+    实际项目中建议拆分为独立文件:
+    - models.ts       (类型定义)
+    - api.ts          (API 客户端)
+    - websocket.ts    (WebSocket 管理)
+    - store.ts        (状态管理)
+    - renderer.ts     (UI 渲染器)
+    ============================================================
+    -->
+    <script>
+        /**
+         * ==========================================
+         * 1. 类型定义 (Type Definitions)
+         * 后端可参考此部分设计数据库模型和 API 响应格式
+         * ==========================================
+         */
+
+        /**
+         * @typedef {Object} CallSession
+         * @property {string} id - 通话唯一标识 (UUID)
+         * @property {'video'|'audio'} type - 通话类型
+         * @property {'connecting'|'ongoing'|'ended'|'failed'} status - 通话状态
+         * @property {string} startTime - ISO 8601 时间戳
+         * @property {number} duration - 已进行秒数
+         * @property {boolean} isEncrypted - 是否启用端到端加密
+         * @property {LocalUser} localUser - 本地用户信息
+         * @property {RemoteUser} remoteUser - 远端用户信息
+         */
+
+        /**
+         * @typedef {Object} LocalUser
+         * @property {string} id - 用户ID
+         * @property {string} name - 显示名称
+         * @property {string} avatar - 头像URL
+         * @property {boolean} isHost - 是否主持人
+         * @property {MediaState} mediaState - 媒体状态
+         */
+
+        /**
+         * @typedef {Object} RemoteUser
+         * @property {string} id - 用户ID
+         * @property {string} name - 显示名称
+         * @property {string} avatar - 头像URL
+         * @property {'online'|'offline'|'connecting'} status - 在线状态
+         * @property {MediaState} mediaState - 媒体状态
+         * @property {'excellent'|'good'|'fair'|'poor'} networkQuality - 网络质量
+         */
+
+        /**
+         * @typedef {Object} MediaState
+         * @property {boolean} audio - 音频是否开启
+         * @property {boolean} video - 视频是否开启
+         * @property {boolean} screenShare - 是否屏幕共享
+         * @property {boolean} isSpeaking - 是否正在说话(VAD)
+         */
+
+        /**
+         * @typedef {Object} ChatMessage
+         * @property {string} id - 消息唯一ID
+         * @property {string} senderId - 发送者ID
+         * @property {string} senderName - 发送者名称
+         * @property {string} senderAvatar - 发送者头像URL
+         * @property {string} content - 消息内容
+         * @property {'text'|'file'|'system'} type - 消息类型
+         * @property {string} timestamp - ISO 8601 时间戳
+         * @property {boolean} isSelf - 是否为自己发送
+         */
+
+        /**
+         * ==========================================
+         * 2. 模拟数据层 (Mock Data Layer)
+         * 后端接口返回的数据格式应与此结构一致
+         * ==========================================
+         */
+
+        // [API_RESPONSE: GET /api/call/:callId]
+        const mockCallSession = {
+            id: "call-8842-2024-001",
+            type: "video",
+            status: "ongoing", // connecting | ongoing | ended | failed
+            startTime: "2024-01-15T14:30:00.000Z",
+            duration: 0, // 秒数，后端可不返回，前端本地计算
+            isEncrypted: true,
+
+            // [API_RESPONSE: 嵌套用户信息]
+            localUser: {
+                id: "user-local-001",
+                name: "我",
+                avatar: "https://images.unsplash.com/photo-1507003211169-0a1dd7228f2d?w=400&h=400&fit=crop",
+                isHost: true,
+                mediaState: {
+                    audio: true,
+                    video: true,
+                    screenShare: false,
+                    isSpeaking: false
+                }
+            },
+
+            remoteUser: {
+                id: "user-remote-002",
+                name: "Sarah Chen",
+                avatar: "https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=400&h=400&fit=crop",
+                status: "online", // online | offline | connecting
+                networkQuality: "excellent", // excellent | good | fair | poor
+                mediaState: {
+                    audio: true,
+                    video: true,
+                    screenShare: false,
+                    isSpeaking: false
+                }
+            }
+        };
+
+        // [API_RESPONSE: GET /api/call/:callId/messages]
+        const mockMessages = [
+            {
+                id: "msg-001",
+                senderId: "system",
+                senderName: "系统",
+                senderAvatar: "/assets/system.png",
+                content: "通话已建立连接",
+                type: "system",
+                timestamp: "2024-01-15T14:30:00.000Z",
+                isSelf: false
+            },
+            {
+                id: "msg-002",
+                senderId: "user-remote-002",
+                senderName: "Sarah Chen",
+                senderAvatar: "https://images.unsplash.com/photo-1494790108377-be9c29b29330?w=100&h=100&fit=crop",
+                content: "嗨，能听到我说话吗？",
+                type: "text",
+                timestamp: "2024-01-15T14:32:15.000Z",
+                isSelf: false
+            },
+            {
+                id: "msg-003",
+                senderId: "user-local-001",
+                senderName: "我",
+                senderAvatar: "https://images.unsplash.com/photo-1507003211169-0a1dd7228f2d?w=100&h=100&fit=crop",
+                content: "很清楚！你的画面也很清晰 👍",
+                type: "text",
+                timestamp: "2024-01-15T14:32:45.000Z",
+                isSelf: true
+            }
+        ];
+
+        /**
+         * ==========================================
+         * 3. 状态管理 (State Management)
+         * 使用简单的 Observable 模式，可替换为 Redux/Vuex/Pinia
+         * ==========================================
+         */
+
+        class CallStateManager {
+            constructor() {
+                // 核心状态
+                this.state = {
+                    session: { ...mockCallSession },
+                    messages: [...mockMessages],
+                    isSidebarOpen: false,
+                    unreadCount: 0,
+                    localStream: null,  // MediaStream 对象
+                    remoteStream: null  // MediaStream 对象
+                };
+
+                // 监听器数组
+                this.listeners = [];
+
+                // 初始化
+                this.init();
+            }
+
+            // 订阅状态变化
+            subscribe(callback) {
+                this.listeners.push(callback);
+                return () => {
+                    this.listeners = this.listeners.filter(cb => cb !== callback);
+                };
+            }
+
+            // 通知所有监听器
+            notify(changes) {
+                this.listeners.forEach(cb => cb(this.state, changes));
+            }
+
+            // 初始化
+            init() {
+                // 启动通话时长计时器
+                this.durationInterval = setInterval(() => {
+                    this.state.session.duration++;
+                    this.notify({ type: 'DURATION_UPDATE', duration: this.state.session.duration });
+                }, 1000);
+
+                // 模拟远端音频活动 (实际应由 WebRTC VAD 检测触发)
+                this.simulateRemoteActivity();
+            }
+
+            // 更新本地媒体状态
+            updateLocalMedia(mediaType, value) {
+                this.state.session.localUser.mediaState[mediaType] = value;
+                this.notify({ type: 'LOCAL_MEDIA_CHANGE', mediaType, value });
+
+                // [API_CALL: POST /api/call/:callId/media]
+                // [WEBSOCKET_EMIT: media-state-changed]
+                this.emitMediaStateChange();
+            }
+
+            // 更新远端媒体状态 (由 WebSocket 消息触发)
+            updateRemoteMedia(mediaState) {
+                this.state.session.remoteUser.mediaState = {
+                    ...this.state.session.remoteUser.mediaState,
+                    ...mediaState
+                };
+                this.notify({ type: 'REMOTE_MEDIA_CHANGE', mediaState });
+            }
+
+            // 添加消息
+            addMessage(message) {
+                this.state.messages.push(message);
+
+                // 如果侧边栏关闭且不是自己发的，增加未读
+                if (!this.state.isSidebarOpen && !message.isSelf) {
+                    this.state.unreadCount++;
+                }
+
+                this.notify({ type: 'NEW_MESSAGE', message, unreadCount: this.state.unreadCount });
+            }
+
+            // 切换侧边栏
+            toggleSidebar() {
+                this.state.isSidebarOpen = !this.state.isSidebarOpen;
+                if (this.state.isSidebarOpen) {
+                    this.state.unreadCount = 0;
+                }
+                this.notify({ type: 'SIDEBAR_TOGGLE', isOpen: this.state.isSidebarOpen });
+            }
+
+            // 结束通话
+            endCall() {
+                clearInterval(this.durationInterval);
+                this.state.session.status = 'ended';
+                this.notify({ type: 'CALL_ENDED' });
+
+                // [API_CALL: POST /api/call/:callId/leave]
+                // [WEBSOCKET_EMIT: leave-call]
+            }
+
+            // 模拟远端活动 (开发测试用)
+            simulateRemoteActivity() {
+                setInterval(() => {
+                    if (Math.random() > 0.7) {
+                        const isSpeaking = Math.random() > 0.5;
+                        this.updateRemoteMedia({ isSpeaking });
+                    }
+                }, 800);
+            }
+
+            // 模拟网络质量变化 (开发测试用)
+            simulateNetworkChange() {
+                const qualities = ['excellent', 'good', 'fair', 'poor'];
+                setInterval(() => {
+                    if (Math.random() > 0.8) {
+                        const quality = qualities[Math.floor(Math.random() * qualities.length)];
+                        this.state.session.remoteUser.networkQuality = quality;
+                        this.notify({ type: 'NETWORK_CHANGE', quality });
+                    }
+                }, 5000);
+            }
+
+            // 发送媒体状态到服务器
+            emitMediaStateChange() {
+                const payload = {
+                    userId: this.state.session.localUser.id,
+                    ...this.state.session.localUser.mediaState
+                };
+                console.log('[WebSocket Emit] media-state-changed:', payload);
+                // socket.emit('media-state-changed', payload);
+            }
+
+            // Getters
+            getState() { return this.state; }
+            getLocalUser() { return this.state.session.localUser; }
+            getRemoteUser() { return this.state.session.remoteUser; }
+            getMessages() { return this.state.messages; }
+        }
+
+        /**
+         * ==========================================
+         * 4. UI 渲染器 (UI Renderer)
+         * 负责将状态映射到 DOM，与状态管理解耦
+         * ==========================================
+         */
+
+        class UIRenderer {
+            constructor(stateManager) {
+                this.stateManager = stateManager;
+                this.unsubscribe = stateManager.subscribe(this.render.bind(this));
+
+                // 缓存 DOM 元素
+                this.elements = {
+                    // 头部
+                    headerTitle: document.getElementById('headerTitle'),
+                    callDuration: document.getElementById('callDuration'),
+                    encryptionBadge: document.getElementById('encryptionBadge'),
+                    unreadBadge: document.getElementById('unreadBadge'),
+
+                    // 远端视频
+                    remoteVideo: document.getElementById('remoteVideo'),
+                    remoteAvatar: document.getElementById('remoteAvatar'),
+                    remoteName: document.getElementById('remoteName'),
+                    remoteStatus: document.getElementById('remoteStatus'),
+                    remoteSpeakingIndicator: document.getElementById('remoteSpeakingIndicator'),
+                    remoteAudioWave: document.getElementById('remoteAudioWave'),
+                    networkStatus: document.getElementById('networkStatus'),
+                    networkStatusText: document.getElementById('networkStatusText'),
+                    connectingOverlay: document.getElementById('connectingOverlay'),
+
+                    // 本地视频
+                    localVideo: document.getElementById('localVideo'),
+                    localVideoPlaceholder: document.getElementById('localVideoPlaceholder'),
+                    localAudioWave: document.getElementById('localAudioWave'),
+                    localInitials: document.getElementById('localInitials'),
+
+                    // 侧边栏
+                    sidebar: document.getElementById('sidebar'),
+                    chatContent: document.getElementById('chatContent'),
+                    userList: document.getElementById('userList'),
+
+                    // 控制按钮
+                    micBtn: document.getElementById('micBtn'),
+                    videoBtn: document.getElementById('videoBtn'),
+                    screenBtn: document.getElementById('screenBtn'),
+                    connectionQuality: document.getElementById('connectionQuality')
+                };
+            }
+
+            // 主渲染入口
+            render(state, changes) {
+                if (!changes) {
+                    // 初始化全量渲染
+                    this.renderHeader(state);
+                    this.renderRemoteVideo(state);
+                    this.renderLocalVideo(state);
+                    this.renderUserList(state);
+                    this.renderMessages(state);
+                    this.renderControls(state);
+                    return;
+                }
+
+                // 增量更新
+                switch (changes.type) {
+                    case 'DURATION_UPDATE':
+                        this.updateDuration(changes.duration);
+                        break;
+                    case 'LOCAL_MEDIA_CHANGE':
+                        this.updateLocalControl(changes.mediaType, changes.value);
+                        this.updateLocalVideoUI(state);
+                        break;
+                    case 'REMOTE_MEDIA_CHANGE':
+                        this.updateRemoteVideoUI(state);
+                        break;
+                    case 'NEW_MESSAGE':
+                        this.appendMessage(changes.message);
+                        this.updateUnreadBadge(changes.unreadCount);
+                        break;
+                    case 'SIDEBAR_TOGGLE':
+                        this.toggleSidebarUI(changes.isOpen);
+                        break;
+                    case 'NETWORK_CHANGE':
+                        this.updateNetworkStatus(changes.quality);
+                        break;
+                    case 'CALL_ENDED':
+                        this.showCallEnded(state.session.duration);
+                        break;
+                }
+            }
+
+            // 渲染头部信息
+            renderHeader(state) {
+                const { session } = state;
+                this.elements.headerTitle.textContent = `与 ${session.remoteUser.name} 的通话`;
+                this.elements.encryptionBadge.style.display = session.isEncrypted ? 'flex' : 'none';
+                this.updateDuration(session.duration);
+            }
+
+            updateDuration(seconds) {
+                const mins = Math.floor(seconds / 60);
+                const secs = seconds % 60;
+                this.elements.callDuration.textContent =
+                    `${String(mins).padStart(2, '0')}:${String(secs).padStart(2, '0')}`;
+            }
+
+            // 渲染远端视频区域
+            renderRemoteVideo(state) {
+                const { remoteUser } = state.session;
+                this.elements.remoteName.textContent = remoteUser.name;
+                this.elements.remoteAvatar.src = remoteUser.avatar;
+                this.elements.remoteVideo.src = remoteUser.avatar; // 实际应为视频流
+
+                this.updateRemoteVideoUI(state);
+                this.updateNetworkStatus(remoteUser.networkQuality);
+            }
+
+            updateRemoteVideoUI(state) {
+                const { remoteUser } = state.session;
+                const media = remoteUser.mediaState;
+
+                // 音频状态
+                if (media.isSpeaking && media.audio) {
+                    this.elements.remoteAudioWave.classList.remove('hidden');
+                    this.elements.remoteSpeakingIndicator.classList.remove('hidden');
+                } else {
+                    this.elements.remoteAudioWave.classList.add('hidden');
+                    this.elements.remoteSpeakingIndicator.classList.add('hidden');
+                }
+
+                // 连接状态
+                const statusText = {
+                    'online': '正在通话',
+                    'connecting': '连接中...',
+                    'offline': '已断开'
+                };
+                this.elements.remoteStatus.textContent = statusText[remoteUser.status];
+
+                // 视频占位 (实际应根据 video track 判断)
+                if (!media.video) {
+                    this.elements.remoteVideo.style.opacity = '0.3';
+                } else {
+                    this.elements.remoteVideo.style.opacity = '1';
+                }
+            }
+
+            // 渲染本地视频
+            renderLocalVideo(state) {
+                const { localUser } = state.session;
+                this.elements.localVideo.src = localUser.avatar; // 实际应为视频流
+                this.elements.localInitials.textContent = localUser.name.substring(0, 2);
+                this.updateLocalVideoUI(state);
+            }
+
+            updateLocalVideoUI(state) {
+                const { localUser } = state.session;
+                const media = localUser.mediaState;
+
+                // 视频开关
+                if (!media.video) {
+                    this.elements.localVideoPlaceholder.classList.remove('hidden');
+                    this.elements.localVideo.style.opacity = '0';
+                } else {
+                    this.elements.localVideoPlaceholder.classList.add('hidden');
+                    this.elements.localVideo.style.opacity = '1';
+                }
+
+                // 音频波形
+                if (media.isSpeaking) {
+                    this.elements.localAudioWave.classList.remove('hidden');
+                } else {
+                    this.elements.localAudioWave.classList.add('hidden');
+                }
+            }
+
+            // 渲染用户列表
+            renderUserList(state) {
+                const { localUser, remoteUser } = state.session;
+
+                // 远端用户状态
+                const remoteStatusText = remoteUser.status === 'online' ? '在线' : '连接中...';
+                const remoteStatusColor = remoteUser.status === 'online' ? 'text-green-400' : 'text-yellow-400';
+
+                // 本地用户状态
+                const localStatusText = !localUser.mediaState.audio ? '静音中' :
+                                       localUser.mediaState.isSpeaking ? '正在说话...' : '在线';
+
+                // HTML 已静态定义，这里更新动态内容
+                // 实际项目中可使用模板引擎渲染
+            }
+
+            // 渲染消息列表
+            renderMessages(state) {
+                this.elements.chatContent.innerHTML = '';
+
+                // 添加时间分隔线
+                const timeDiv = document.createElement('div');
+                timeDiv.className = 'text-center text-xs text-gray-500 my-4';
+                const startTime = new Date(state.session.startTime);
+                timeDiv.textContent = `通话开始 ${startTime.getHours()}:${String(startTime.getMinutes()).padStart(2, '0')}`;
+                this.elements.chatContent.appendChild(timeDiv);
+
+                // 渲染每条消息
+                state.messages.forEach(msg => this.appendMessage(msg, false));
+
+                // 滚动到底部
+                this.scrollToBottom();
+            }
+
+            appendMessage(message, shouldScroll = true) {
+                if (message.type === 'system') return; // 系统消息可选显示
+
+                const div = document.createElement('div');
+                div.className = 'chat-bubble';
+
+                const time = new Date(message.timestamp).toLocaleTimeString('zh-CN', {
+                    hour: '2-digit',
+                    minute: '2-digit'
+                });
+
+                const isSelf = message.isSelf;
+                const bubbleClass = isSelf ?
+                    'bg-indigo-600 rounded-tr-none flex-row-reverse' :
+                    'glass rounded-tl-none';
+                const nameColor = isSelf ? 'text-green-400' : 'text-indigo-400';
+
+                div.innerHTML = `
+                    <div class="flex gap-3 ${isSelf ? 'flex-row-reverse' : ''}">
+                        <img src="${message.senderAvatar}" class="w-8 h-8 rounded-full object-cover" onerror="this.src='https://via.placeholder.com/100'">
+                        <div class="flex-1 ${isSelf ? 'flex flex-col items-end' : ''}">
+                            <div class="flex items-baseline gap-2 mb-1 ${isSelf ? 'flex-row-reverse' : ''}">
+                                <span class="text-sm font-medium ${nameColor}">${message.senderName}</span>
+                                <span class="text-xs text-gray-500">${time}</span>
+                            </div>
+                            <div class="${bubbleClass} px-3 py-2 rounded-2xl text-sm text-white max-w-[80%] break-words">
+                                ${this.escapeHtml(message.content)}
+                            </div>
+                        </div>
+                    </div>
+                `;
+
+                this.elements.chatContent.appendChild(div);
+                if (shouldScroll) this.scrollToBottom();
+            }
+
+            // 渲染控制按钮
+            renderControls(state) {
+                const { localUser } = state.session;
+                const media = localUser.mediaState;
+
+                this.updateLocalControl('audio', media.audio);
+                this.updateLocalControl('video', media.video);
+                this.updateLocalControl('screenShare', media.screenShare);
+            }
+
+            updateLocalControl(type, value) {
+                const btnMap = {
+                    'audio': { btn: this.elements.micBtn, iconDefault: 'fa-microphone', iconActive: 'fa-microphone-slash' },
+                    'video': { btn: this.elements.videoBtn, iconDefault: 'fa-video', iconActive: 'fa-video-slash' },
+                    'screenShare': { btn: this.elements.screenBtn, iconDefault: 'fa-desktop', iconActive: 'fa-stop-circle' }
+                };
+
+                const config = btnMap[type];
+                if (!config) return;
+
+                const btn = config.btn;
+                const iconDefault = btn.querySelector('[data-icon="default"]');
+                const iconActive = btn.querySelector('[data-icon="active"]');
+
+                // 清除所有状态类
+                btn.classList.remove('bg-red-500/20', 'bg-green-500/20', 'border', 'border-red-500/50', 'border-green-500/50');
+                btn.classList.add('glass');
+                iconDefault.classList.remove('hidden');
+                iconActive.classList.add('hidden');
+
+                if (!value) { // 关闭状态 (音频静音/视频关闭)
+                    if (type === 'screenShare') return; // 屏幕共享特殊处理
+
+                    btn.classList.remove('glass');
+                    btn.classList.add('bg-red-500/20', 'border', 'border-red-500/50');
+                    iconDefault.classList.add('hidden');
+                    iconActive.classList.remove('hidden');
+
+                } else if (type === 'screenShare' && value) { // 屏幕共享开启
+                    btn.classList.remove('glass');
+                    btn.classList.add('bg-green-500/20', 'border', 'border-green-500/50');
+                    iconDefault.classList.add('hidden');
+                    iconActive.classList.remove('hidden');
+                    iconActive.classList.add('text-green-400');
+                }
+            }
+
+            // 更新网络状态显示
+            updateNetworkStatus(quality) {
+                const qualityMap = {
+                    'excellent': { text: '优秀', color: 'text-green-400', show: false },
+                    'good': { text: '良好', color: 'text-blue-400', show: false },
+                    'fair': { text: '一般', color: 'text-yellow-400', show: true },
+                    'poor': { text: '较差', color: 'text-red-400', show: true }
+                };
+
+                const q = qualityMap[quality];
+                this.elements.connectionQuality.textContent = `连接质量: ${q.text}`;
+                this.elements.connectionQuality.className = `text-xs ${q.color}`;
+
+                if (q.show) {
+                    this.elements.networkStatus.classList.remove('hidden');
+                    this.elements.networkStatusText.textContent = quality === 'fair' ? '网络不稳定' : '网络连接差';
+                } else {
+                    this.elements.networkStatus.classList.add('hidden');
+                }
+            }
+
+            // 切换侧边栏显示
+            toggleSidebarUI(isOpen) {
+                if (isOpen) {
+                    this.elements.sidebar.classList.remove('hidden');
+                    this.scrollToBottom();
+                } else {
+                    this.elements.sidebar.classList.add('hidden');
+                }
+            }
+
+            // 更新未读徽章
+            updateUnreadBadge(count) {
+                const badge = this.elements.unreadBadge;
+                if (count > 0) {
+                    badge.textContent = count > 99 ? '99+' : count;
+                    badge.classList.remove('hidden');
+                } else {
+                    badge.classList.add('hidden');
+                }
+            }
+
+            // 显示通话结束
+            showCallEnded(duration) {
+                const mins = Math.floor(duration / 60);
+                const secs = duration % 60;
+                const timeStr = `${String(mins).padStart(2, '0')}:${String(secs).padStart(2, '0')}`;
+
+                document.body.innerHTML = `
+                    <div class="h-screen w-screen flex items-center justify-center bg-slate-900 text-white flex-col gap-4">
+                        <div class="w-16 h-16 bg-green-500 rounded-full flex items-center justify-center mb-4 animate-bounce">
+                            <i class="fas fa-check text-2xl"></i>
+                        </div>
+                        <h2 class="text-2xl font-bold">通话已结束</h2>
+                        <p class="text-gray-400">通话时长: ${timeStr}</p>
+                        <div class="flex gap-3 mt-4">
+                            <button onclick="location.reload()" class="px-6 py-2 bg-indigo-600 rounded-full hover:bg-indigo-700 transition-colors">
+                                重新拨打
+                            </button>
+                            <button onclick="window.close()" class="px-6 py-2 glass rounded-full hover:bg-white/10 transition-colors">
+                                关闭窗口
+                            </button>
+                        </div>
+                    </div>
+                `;
+            }
+
+            // 工具方法
+            scrollToBottom() {
+                this.elements.chatContent.scrollTop = this.elements.chatContent.scrollHeight;
+            }
+
+            escapeHtml(text) {
+                const div = document.createElement('div');
+                div.textContent = text;
+                return div.innerHTML;
+            }
+
+            destroy() {
+                this.unsubscribe();
+            }
+        }
+
+        /**
+         * ==========================================
+         * 5. 初始化与事件绑定
+         * ==========================================
+         */
+
+        // 初始化状态管理器和渲染器
+        const stateManager = new CallStateManager();
+        const renderer = new UIRenderer(stateManager);
+
+        // 全局函数供 HTML 调用
+        window.toggleMute = function(btn) {
+            const currentState = stateManager.getLocalUser().mediaState.audio;
+            stateManager.updateLocalMedia('audio', !currentState);
+        };
+
+        window.toggleVideo = function(btn) {
+            const currentState = stateManager.getLocalUser().mediaState.video;
+            stateManager.updateLocalMedia('video', !currentState);
+        };
+
+        window.toggleLocalVideo = function() {
+            window.toggleVideo();
+        };
+
+        window.toggleScreenShare = function(btn) {
+            const currentState = stateManager.getLocalUser().mediaState.screenShare;
+            stateManager.updateLocalMedia('screenShare', !currentState);
+        };
+
+        window.toggleSidebar = function() {
+            stateManager.toggleSidebar();
+        };
+
+        window.sendMessage = function() {
+            const input = document.getElementById('chatInput');
+            const content = input.value.trim();
+            if (!content) return;
+
+            const newMessage = {
+                id: `msg-${Date.now()}`,
+                senderId: stateManager.getLocalUser().id,
+                senderName: stateManager.getLocalUser().name,
+                senderAvatar: stateManager.getLocalUser().avatar,
+                content: content,
+                type: 'text',
+                timestamp: new Date().toISOString(),
+                isSelf: true
+            };
+
+            stateManager.addMessage(newMessage);
+            input.value = '';
+
+            // 模拟对方回复 (开发测试)
+            setTimeout(() => {
+                const replies = ['收到 👍', '明白', '好的，继续', '稍等，我记一下', '没问题'];
+                const replyMsg = {
+                    id: `msg-${Date.now()}`,
+                    senderId: stateManager.getRemoteUser().id,
+                    senderName: stateManager.getRemoteUser().name,
+                    senderAvatar: stateManager.getRemoteUser().avatar,
+                    content: replies[Math.floor(Math.random() * replies.length)],
+                    type: 'text',
+                    timestamp: new Date().toISOString(),
+                    isSelf: false
+                };
+                stateManager.addMessage(replyMsg);
+            }, 1500 + Math.random() * 2000);
+        };
+
+        window.handleChatSubmit = function(event) {
+            if (event.key === 'Enter') {
+                window.sendMessage();
+            }
+        };
+
+        window.endCall = function() {
+            if (confirm('确定要结束通话吗？')) {
+                stateManager.endCall();
+            }
+        };
+
+        // 键盘快捷键
+        document.addEventListener('keydown', (e) => {
+            if (e.code === 'Space' && e.target.tagName !== 'INPUT') {
+                e.preventDefault();
+                window.toggleMute();
+            }
+            if (e.code === 'KeyV' && e.ctrlKey) {
+                e.preventDefault();
+                window.toggleVideo();
+            }
+        });
+
+        // 通知函数
+        window.showNotification = function(text) {
+            const notification = document.getElementById('notification');
+            document.getElementById('notificationText').textContent = text;
+            notification.classList.remove('opacity-0', 'translate-y-[-20px]');
+
+            setTimeout(() => {
+                notification.classList.add('opacity-0', 'translate-y-[-20px]');
+            }, 3000);
+        };
+
+        // 监听状态变化显示通知
+        stateManager.subscribe((state, changes) => {
+            if (!changes) return;
+
+            if (changes.type === 'LOCAL_MEDIA_CHANGE') {
+                const actionMap = {
+                    'audio': changes.value ? '麦克风已开启' : '麦克风已静音',
+                    'video': changes.value ? '摄像头已开启' : '摄像头已关闭',
+                    'screenShare': changes.value ? '开始共享屏幕' : '停止共享屏幕'
+                };
+                showNotification(actionMap[changes.mediaType]);
+            }
+        });
+
+        // 启动网络质量模拟 (开发测试)
+        stateManager.simulateNetworkChange();
+
+        // 暴露到全局供调试
+        window.callState = stateManager;
+        window.callRenderer = renderer;
+    </script>
+</body>
+</html>
