<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>系统维护中 - 稍后回来</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #1a2a6c, #2c3e50, #4a235a);
            color: #fff;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite;
        }
        
        @keyframes gradientBG {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }
        
        .maintenance-container {
            max-width: 800px;
            width: 100%;
            background: rgba(0, 0, 0, 0.7);
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            animation: fadeIn 1s ease-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .logo {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: #4dabf7;
        }
        
        .logo i {
            font-size: 3.5rem;
            margin-bottom: 15px;
            display: block;
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            color: #fff;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }
        
        .status-tag {
            display: inline-block;
            background: linear-gradient(90deg, #ff6b6b, #ff8e53);
            color: white;
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.1rem;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
            animation: pulse 2s infinite;
        }
        
        @keyframes pulse {
            0% { box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4); }
            50% { box-shadow: 0 5px 25px rgba(255, 107, 107, 0.7); }
            100% { box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4); }
        }
        
        .subtitle {
            font-size: 1.4rem;
            margin-bottom: 30px;
            color: #d0d0d0;
            line-height: 1.6;
        }
        
        .blink {
            animation: blink 1.5s infinite;
        }
        
        @keyframes blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .maintenance-container {
                padding: 25px;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            .subtitle {
                font-size: 1.2rem;
            }
        }
        
        @media (max-width: 480px) {
            .maintenance-container {
                padding: 20px;
            }
            
            h1 {
                font-size: 1.8rem;
            }
        }
    </style>
</head>
<body>
    <div class="maintenance-container">
        <div class="logo">
            <i class="fas fa-cogs"></i>
            系统维护
        </div>
        
        <h1>系统正在维护升级中</h1>
        
        <div class="status-tag blink">
            <i class="fas fa-tools"></i> 维护进行中
        </div>
        
        <p class="subtitle">
            我们正在对系统进行重要的升级和维护，以提供更好的服务和用户体验。<br>
            给您带来的不便，我们深表歉意。
        </p>
    </div>

    <script>
        // 状态消息轮播
        document.addEventListener('DOMContentLoaded', function() {
            const statusMessages = [
                "系统维护中...",
                "升级进行中...",
                "请稍后再试..."
            ];
            
            let messageIndex = 0;
            const statusElement = document.querySelector('.status-tag');
            const originalText = statusElement.innerHTML;
            
            setInterval(() => {
                if (statusElement.textContent.includes("维护进行中")) {
                    statusElement.innerHTML = `<i class="fas fa-tools"></i> ${statusMessages[messageIndex]}`;
                    messageIndex = (messageIndex + 1) % statusMessages.length;
                    
                    // 3秒后恢复原状态
                    setTimeout(() => {
                        if (statusElement.textContent.includes("...")) {
                            statusElement.innerHTML = originalText;
                        }
                    }, 3000);
                }
            }, 8000);
        });
    </script>
</body>
</html>