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<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <title>聊天应用</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
            -webkit-touch-callout: none;
        }

        html, body {
            height: 100%;
            width: 100%;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f5f5f5;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        .chat-container {
            width: 100vw;
            max-width: 480px;
            height: 100vh;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            background-color: #fff;
            position: relative;
            box-shadow: 0 2px 16px rgba(0,0,0,0.06);
        }

        .chat-header {
            padding: 15px;
            background-color: #1890ff;
            color: white;
            text-align: center;
            position: relative;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            z-index: 100;
        }

        .chat-messages {
            flex: 1;
            overflow-y: auto;
            padding: 15px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            -webkit-overflow-scrolling: touch;
            position: relative;
        }

        .message {
            max-width: 70%;
            padding: 10px 15px;
            border-radius: 15px;
            margin-bottom: 5px;
            position: relative;
            word-wrap: break-word;
            animation: messageAppear 0.3s ease-out;
        }

        @keyframes messageAppear {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.sent {
            align-self: flex-end;
            background-color: #1890ff;
            color: white;
            border-bottom-right-radius: 5px;
        }

        .message.received {
            align-self: flex-start;
            background-color: #f0f0f0;
            color: #333;
            border-bottom-left-radius: 5px;
        }

        .message-time {
            font-size: 12px;
            color: #999;
            margin-top: 5px;
            text-align: right;
        }

        .chat-input-container {
            padding: 10px;
            background-color: #fff;
            border-top: 1px solid #eee;
            display: flex;
            gap: 10px;
            align-items: center;
            position: relative;
            z-index: 100;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .chat-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 20px;
            outline: none;
            font-size: 16px;
            background-color: #f8f8f8;
            transition: all 0.3s ease;
            -webkit-appearance: none;
            appearance: none;
        }

        .chat-input:focus {
            border-color: #1890ff;
            background-color: #fff;
            box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
        }

        .send-button {
            background-color: #1890ff;
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 16px;
            transition: all 0.3s ease;
            user-select: none;
            -webkit-user-select: none;
            -webkit-appearance: none;
            appearance: none;
        }

        .send-button:active {
            transform: scale(0.95);
            background-color: #40a9ff;
        }

        .message-status {
            font-size: 12px;
            color: #999;
            margin-top: 2px;
        }

        .typing-indicator {
            padding: 10px;
            color: #666;
            font-style: italic;
            display: none;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .message-content {
            line-height: 1.4;
        }

        /* 添加滚动条样式 */
        .chat-messages::-webkit-scrollbar {
            width: 6px;
        }

        .chat-messages::-webkit-scrollbar-track {
            background: #f1f1f1;
        }

        .chat-messages::-webkit-scrollbar-thumb {
            background: #888;
            border-radius: 3px;
        }

        .chat-messages::-webkit-scrollbar-thumb:hover {
            background: #555;
        }
    </style>
</head>
<body>
    <div class="chat-container">
        <div class="chat-header">
            <h2>聊天室</h2>
        </div>
        <div class="chat-messages" id="chatMessages">
            <div class="message received">
                <div class="message-content">你好!欢迎来到聊天室</div>
                <div class="message-time">10:00</div>
            </div>
            <div class="message sent">
                <div class="message-content">谢谢!很高兴见到你</div>
                <div class="message-time">10:01</div>
                <div class="message-status">已读</div>
            </div>
        </div>
        <div class="typing-indicator" id="typingIndicator">
            对方正在输入...
        </div>
        <div class="chat-input-container">
            <input type="text" 
                   class="chat-input" 
                   id="messageInput" 
                   placeholder="输入消息..."
                   autocomplete="off"
                   autocorrect="off"
                   autocapitalize="off"
                   spellcheck="false"
                   inputmode="text"
                   enterkeyhint="send">
            <button class="send-button" onclick="sendMessage()">发送</button>
        </div>
    </div>

    <script>
        const messageInput = document.getElementById('messageInput');
        const chatMessages = document.getElementById('chatMessages');
        const typingIndicator = document.getElementById('typingIndicator');
        let isComposing = false;

        // 自动滚动到底部
        function scrollToBottom() {
            chatMessages.scrollTop = chatMessages.scrollHeight;
        }

        // 初始化时滚动到底部
        scrollToBottom();

        // 监听输入法组合事件
        messageInput.addEventListener('compositionstart', () => {
            isComposing = true;
        });

        messageInput.addEventListener('compositionend', () => {
            isComposing = false;
        });

        function sendMessage() {
            const message = messageInput.value.trim();
            if (message && !isComposing) {
                const now = new Date();
                const timeString = now.getHours().toString().padStart(2, '0') + ':' + 
                                 now.getMinutes().toString().padStart(2, '0');

                const messageElement = document.createElement('div');
                messageElement.className = 'message sent';
                messageElement.innerHTML = `
                    <div class="message-content">${message}</div>
                    <div class="message-time">${timeString}</div>
                    <div class="message-status">发送中</div>
                `;

                chatMessages.appendChild(messageElement);
                messageInput.value = '';
                scrollToBottom();

                // 模拟消息发送状态
                setTimeout(() => {
                    messageElement.querySelector('.message-status').textContent = '已发送';
                }, 1000);

                setTimeout(() => {
                    messageElement.querySelector('.message-status').textContent = '已读';
                }, 2000);

                // 模拟对方正在输入
                typingIndicator.style.display = 'block';
                setTimeout(() => {
                    typingIndicator.style.display = 'none';
                    // 模拟回复
                    const replyElement = document.createElement('div');
                    replyElement.className = 'message received';
                    replyElement.innerHTML = `
                        <div class="message-content">收到你的消息了!</div>
                        <div class="message-time">${timeString}</div>
                    `;
                    chatMessages.appendChild(replyElement);
                    scrollToBottom();
                }, 3000);
            }
        }

        // 监听回车键发送
        messageInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter' && !e.shiftKey && !isComposing) {
                e.preventDefault();
                sendMessage();
            }
        });

        // 监听输入框焦点
        messageInput.addEventListener('focus', () => {
            setTimeout(scrollToBottom, 100);
        });

        // 防止iOS橡皮筋效果
        document.body.addEventListener('touchmove', (e) => {
            if (e.target === chatMessages) {
                e.preventDefault();
            }
        }, { passive: false });

        // 处理键盘弹出时的布局调整
        window.addEventListener('resize', () => {
            scrollToBottom();
        });
    </script>
</body>
</html>