* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft YaHei", Arial, sans-serif;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.7;
        }
        /* 顶部导航栏 */
        .header {
            background: linear-gradient(135deg, #2c5c97, #3b7bd5);
            color: #fff;
            padding: 18px 20px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 99;
        }
        .header h1 {
            font-size: 24px;
            font-weight: 600;
        }
        .header p {
            font-size: 14px;
            opacity: 0.9;
            margin-top: 5px;
        }
        /* 主体容器 */
        .container {
            max-width: 1200px;
            margin: 30px auto;
            padding: 0 15px;
        }
        /* 内容卡片 */
        .card {
            background: #fff;
            border-radius: 12px;
            padding: 25px 30px;
            margin-bottom: 25px;
            box-shadow: 0 3px 12px rgba(0,0,0,0.06);
            transition: all 0.3s ease;
        }
        .card:hover {
            box-shadow: 0 5px 18px rgba(0,0,0,0.1);
        }
        /* 标题层级 */
        .main-title {
            font-size: 22px;
            color: #2c5c97;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #e6edf7;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sub-title {
            font-size: 18px;
            color: #333;
            margin: 20px 0 12px;
            font-weight: 600;
        }
        .third-title {
            font-size: 16px;
            color: #444;
            margin: 15px 0 10px;
            font-weight: 600;
        }
        /* 文本样式 */
        .desc {
            font-size: 15px;
            color: #555;
            margin-bottom: 12px;
        }
        .highlight {
            color: #d93025;
            font-weight: 600;
        }
        .key-point {
            color: #2c5c97;
            font-weight: 600;
        }
        /* 列表样式 */
        .custom-list {
            padding-left: 25px;
            margin: 12px 0;
        }
        .custom-list li {
            font-size: 15px;
            color: #555;
            margin-bottom: 8px;
            line-height: 1.8;
        }
        /* 警示框 */
        .warn-box {
            background-color: #fff8e1;
            border-left: 4px solid #ffb300;
            padding: 15px 20px;
            border-radius: 6px;
            margin: 20px 0;
        }
        .warn-box p {
            font-size: 15px;
            color: #6d4c41;
            margin-bottom: 8px;
        }
        .warn-box p:last-child {
            margin-bottom: 0;
        }
        /* 分割线 */
        .divider {
            height: 1px;
            background-color: #e6edf7;
            margin: 25px 0;
        }
        /* 操作路径样式 */
        .path {
            background-color: #f5f7fa;
            padding: 4px 8px;
            border-radius: 4px;
            font-family: monospace;
            font-size: 14px;
            color: #2c5c97;
        }
        /* 响应式适配 */
        @media (max-width: 768px) {
            .header h1 {
                font-size: 20px;
            }
            .card {
                padding: 20px 15px;
            }
            .main-title {
                font-size: 20px;
            }
            .sub-title {
                font-size: 17px;
            }
            .custom-list {
                padding-left: 20px;
            }
        }
        /* 底部 */
        .footer {
            text-align: center;
            padding: 20px;
            font-size: 14px;
            color: #888;
            margin-top: 40px;
            border-top: 1px solid #e6edf7;
        }