/* 全局样式 */
    body {
        margin: 0;
        padding: 0;
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #1e3c72, #2a5298);
        color: #ffffff;
    }
    
    /* 头部样式 */
    header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        background: rgba(30, 60, 114, 0.8);
        padding: 20px;
        z-index: 1000;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    header h1 {
        margin: 0;
        font-size: 24px;
        color: #ffffff;
    }
    
    nav a {
        margin-left: 15px;
        color: #FF851B;
        text-decoration: none;
        transition: color 0.3s ease;
    }
    
    nav a:hover {
        color: #B10DC9;
    }
    
    /* 主内容区域 */
    .main-content {
        padding: 100px 20px 20px 20px;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }
    
    .card {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        padding: 20px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        backdrop-filter: blur(10px);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    
    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    }
    
    .card img {
        width: 100%;
        border-radius: 10px;
        margin-bottom: 15px;
    }
    
    .card h2 {
        font-size: 20px;
        color: #FF851B;
        margin-bottom: 10px;
    }
    
    .card p {
        font-size: 16px;
        line-height: 1.6;
        color: #ffffff;
    }
    
    /* 示例展示区 */
    .example-section {
        grid-column: 1 / -1;
        background: rgba(40, 50, 90, 0.8);
        padding: 30px;
        border-radius: 10px;
    }
    
    .example-section h2 {
        color: #B10DC9;
        margin-bottom: 15px;
    }
    
    .example-section pre {
        background: #2a5298;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        color: #00FF00;
        font-family: 'Courier New', Courier, monospace;
    }
    
    .example-section table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 15px;
    }
    
    .example-section table, .example-section th, .example-section td {
        border: 1px solid #ffffff;
    }
    
    .example-section th, .example-section td {
        padding: 10px;
        text-align: left;
    }
    
    .example-section th {
        background: #1e3c72;
    }
    
    /* 底部样式 */
    footer {
        background: rgba(30, 60, 114, 0.9);
        padding: 20px;
        text-align: center;
        color: #ffffff;
        position: fixed;
        bottom: 0;
        width: 100%;
    }
    
    /* 响应式设计 */
    @media (max-width: 768px) {
        header h1 {
            font-size: 20px;
        }
        
        nav a {
            margin-left: 10px;
            font-size: 14px;
        }
        
        .card h2 {
            font-size: 18px;
        }
        
        .card p {
            font-size: 14px;
        }
    }
    
    @media (max-width: 480px) {
        header {
            flex-direction: column;
            align-items: flex-start;
        }
        
        nav {
            margin-top: 10px;
        }
        
        .main-content {
            padding: 120px 10px 10px 10px;
        }
    }
    
    /* 动画效果 */
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
    
    .fade-in {
        animation: fadeIn 2s ease-in-out;
    }
    
    /* 按钮样式 */
    .btn {
        display: inline-block;
        padding: 10px 20px;
        background: linear-gradient(45deg, #FF851B, #B10DC9);
        color: #ffffff;
        border: none;
        border-radius: 5px;
        text-decoration: none;
        font-size: 16px;
        transition: background 0.3s ease;
    }
    
    .btn:hover {
        background: linear-gradient(45deg, #B10DC9, #FF851B);
    }