/* 全局样式重置与基础设置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }
        html, body {
            height: 100%;
        }
        body {
            background-color: #f8fafc;
            color: #334155;
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            padding: 2rem 1rem;
        }

        /* 容器居中控制 */
        .container {
            max-width: 800px;
            margin: 0 auto;
            flex: 1;
            width: 100%;
        }

        /* 网站标题样式 */
        .site-title {
            font-weight: 600;
            text-align: center;
            padding: 2.5rem 0;
            color: #0f172a;
            border-bottom: 1px solid #e2e8f0;
            margin-bottom: 3rem;
            font-size: clamp(1.8rem, 5vw, 2.2rem);
        }

        /* 分类列表区域 */
        .category-list {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
            margin-bottom: 3.5rem;
        }
        .category-item {
            background-color: #ffffff;
            text-align: center;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
            transition: all 0.3s ease;
            cursor: pointer;
        }
        .category-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
            background-color: #f1f5f9;
        }
        /* 分类超链接样式 - 彻底移除下划线，保留核心交互 */
        .category-link {
            font-size: clamp(1.2rem, 3vw, 1.4rem);
            font-weight: 500;
            color: #1e293b;
            text-decoration: none; /* 清除默认下划线 */
            display: block;
            width: 100%;
            height: 100%;
        }
        /* 悬停仅变蓝，无下划线（核心修改） */
        .category-link:hover {
            color: #2563eb;
            text-decoration: none; /* 强制移除悬停下划线 */
        }

        /* 文字说明区域 */
        .description {
            background-color: #ffffff;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
            line-height: 1.8;
            color: #475569;
            margin-bottom: 2rem;
        }

        /* 底部自适应页脚 */
        .footer {
            max-width: 800px;
            margin: 2rem auto 0;
            padding-top: 1.5rem;
            border-top: 1px solid #e2e8f0;
            text-align: center;
            color: #64748b;
            font-size: 0.9rem;
            width: 100%;
        }
        .footer p {
            margin: 0.3rem 0;
        }
        /* 小屏幕适配 */
        @media (max-width: 480px) {
            .footer {
                font-size: 0.8rem;
                padding-top: 1rem;
            }
        }