/* 基础样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            color: #333;
            padding-top: 40px; /* 为顶部固定标题栏留出空间 */
            padding-bottom: 50px; /* 为底部固定导航栏留出空间 */
            min-height: 100vh;
        }
        
         /* 顶部固定标题栏 - 标题居中 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 40px;
            background: linear-gradient(to right, #1a237e, #283593);
            color: white;
            display: flex;
            align-items: center;
            padding: 0 15px;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-content {
            display: flex;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            align-items: center;
            justify-content: center; /* 标题居中 */
            gap: 10px;
            position: relative;
        }
        
        .header-title {
            font-size: 20px;
            font-weight: 600;
            align-items: center;
            letter-spacing: 1px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;

            right: 20px;
            flex: 1;
        }
        
        .header-help {
            position: absolute;
            right: 0;
            color: white;
            text-decoration: none;
            font-size: 14px;
            padding: 6px 12px;
            border-radius: 4px;
            background-color: rgba(255, 255, 255, 0.15);
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.2);
            white-space: nowrap;
        }
        
        .header-help:hover {
            background-color: rgba(255, 255, 255, 0.25);
        }
        
        /* 主要内容区域 */
        .main-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 8px;
        }
                /* 声明区域 */
        .disclaimer-section {
            text-align: center;
            padding: 25px;
            color: #7f8c8d;
            font-size: 14px;
            line-height: 1.6;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        
        /* 底部导航栏 */
        .footer-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 50px;
            background: linear-gradient(to right, #fefefe, #f3f4f7);
            border-top: 1px solid #e0e0e0;
            display: flex;
            justify-content: space-around;
            align-items: center;
            z-index: 1000;
        }
        
        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            color: #52565e;
            flex: 1;
            height: 100%;
        }
        
        .nav-item.active {
            color: #3498db;
        }
        
        .nav-icon {
            font-size: 18px;
            margin-bottom: 3px;
        }
        
        .nav-text {
            font-size: 12px;
        }