/* --- 基础样式重置 --- */
        :root {
            --primary-color: #0056b3;
            --accent-color: #004494;
            --text-dark: #333333;
            --text-gray: #666666;
            --text-light: #999999;
            --bg-light: #f8f9fa;
            --border-color: #e9ecef;
            --white: #ffffff;
            --font-main: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
            --transition: all 0.3s ease;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: var(--font-main); color: var(--text-dark); line-height: 1.7; background-color: #fff; font-size: 16px; padding-top: 45px; /* 为顶部条预留空间，防止滚动时内容被遮挡 */ }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        ul { list-style: none; }
        ol{list-style: none;}
        img { max-width: 100%; height: auto; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .section-padding { padding: 40px 0; }
        .text-center { text-align: center; }
        .text-primary { color: var(--primary-color); }
        .btn { display: inline-block; padding: 14px 32px; border-radius: 4px; font-weight: 600; cursor: pointer; transition: var(--transition); text-transform: uppercase; letter-spacing: 1px; font-size: 14px; }
        .btn-primary { background: var(--primary-color); color: #fff; border: 1px solid var(--primary-color); }
        .btn-primary:hover { background: var(--accent-color); border-color: var(--accent-color); }
        .btn-outline { background: transparent; color: #fff; border: 1px solid #fff; }
        .btn-outline:hover { background: #fff; color: var(--primary-color); }

        /* ================= 顶部快捷导航条 (Top Tab Bar) ================= */
        /* 修改逻辑：PC端使用 fixed 定位但预留 body padding，或者使用 relative 占据文档流。
           这里采用 fixed 定位 + body padding 方案，体验更好。
        */
        .top-tab-bar {
            background-color: #f0f4f8;
            border-bottom: 1px solid #e1e8ed;
            font-size: 13px;
            color: var(--text-light);
            height: 45px;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1001; /* 低于主导航的 z-index，或者主导航滚动后覆盖它 */
            transition: transform 0.3s ease;
        }
        .top-tab-inner { display: flex; justify-content: space-between; align-items: center; height: 100%; }
        .top-tab-links { display: flex; align-items: center; gap: 5px; overflow-x: auto; scrollbar-width: none; }
        .top-tab-links::-webkit-scrollbar { display: none; }
        .top-tab-item { display: flex; align-items: center; gap: 5px; padding: 5px 12px; border-radius: 20px; color: var(--text-light); white-space: nowrap; transition: var(--transition); }
        .top-tab-item:hover { background-color: var(--primary-color); color: var(--white); }
        .tab-icon { font-size: 14px; }
        .top-tab-contact { display: flex; align-items: center; gap: 8px; white-space: nowrap; }
        .contact-phone { color: var(--accent-color); font-weight: bold; font-size: 15px; }
        .contact-phone:hover { text-decoration: underline; }
        .contact-divider { color: #ccc; }

        /* ================= 头部导航 (Header) ================= */
        header {
            background: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0; /* 粘性定位，滚动时吸附顶部 */
            z-index: 1002; /* 必须高于顶部条 */
            height: 70px;
            display: flex;
            align-items: center;
        }
        .nav-wrapper { display: flex; justify-content: space-between; align-items: center; width: 100%; }
        .logo { font-size: 20px; font-weight: bold; color: var(--primary-color); display: flex; align-items: center; }
        .logo span { color: var(--text-dark); margin-left: 15px; font-size: 14px; }
        .nav-menu { display: flex; gap: 30px; }
        .nav-menu a { font-weight: 500; color: var(--text-dark); font-size: 16px; }
        .nav-menu a:hover, .nav-menu a.active { color: var(--primary-color); }
        .nav-cta { display: flex; gap: 15px; }
        .mobile-menu-btn { display: none; font-size: 28px; color: var(--text-dark); cursor: pointer; }

        /* Banner */
        .hero {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
            color: var(--white);
            padding: 140px 0 80px;
            text-align: center;
        }
        .hero h1 { color: var(--white); font-size: 36px; margin-bottom: 20px; }
        .hero p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; }
        .hero .note { font-size: 14px; opacity: 0.8; margin-bottom: 40px; display: block; }
        .hero .btn-group { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }

        /* 板块通用 */
        .section-title { text-align: center; margin-bottom: 50px; }
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        
        /* 列表样式 */
        .check-list li, .step-list li { position: relative; padding-left: 25px; margin-bottom: 15px; color: var(--text-gray);text-align: justify; }
        .check-list li::before { content: '✔'; position: absolute; left: 0; color: var(--accent-color); font-weight: bold; }
        .step-list li::before { content: counter(step); counter-increment: step; position: absolute; left: 0; background: var(--primary-color); color: var(--white); width: 20px; height: 20px; border-radius: 50%; text-align: center; line-height: 20px; font-size: 12px; }
        .step-list { counter-reset: step; }

        /* 表格样式 */
        .data-table { width: 100%; border-collapse: collapse; margin: 30px 0; background: var(--white); box-shadow: 0 2px 10px rgba(0,0,0,0.05); border-radius: var(--border-radius); overflow: hidden; }
        .data-table th, .data-table td { padding: 15px; text-align: left; border-bottom: 1px solid #eee; }
        .data-table th { background: var(--primary-color); color: var(--white); font-weight: 600; }
        .data-table tr:hover { background: #f9f9f9; }

        /* FAQ 样式 */
        .faq-item { border-bottom: 1px solid #eee; margin-bottom: 10px; }
        .faq-question { padding: 15px; cursor: pointer; font-weight: 600; color: var(--primary-color); position: relative; }
        .faq-question::after { content: '+'; position: absolute; right: 15px; font-size: 20px; }
        .faq-answer { padding: 0 15px; max-height: 0; overflow: hidden; transition: max-height 0.3s ease; color: var(--text-gray); }
        .faq-item.active .faq-answer { padding: 0 15px 15px; max-height: 200px; }
        .faq-item.active .faq-question::after { content: '-'; }

        /* 底部 */
        footer { background: #222; color: #ccc; padding: 60px 0 20px; font-size: 14px; }
        footer h4 { color: var(--white); margin-bottom: 20px; font-size: 18px; }
        footer a { color: #ccc; }
        footer a:hover { color: var(--white); }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .copyright { border-top: 1px solid #444; padding-top: 20px; text-align: center; font-size: 12px; }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .nav-menu, .nav-cta { display: none; }
            .mobile-menu-btn { display: block; color: var(--primary-color); }
            .hero h1 { font-size: 26px; }
            .grid-2, .grid-3, .footer-grid { grid-template-columns: 1fr; }
 
            .data-table tr { margin-bottom: 15px; border: 1px solid #eee; border-radius: 8px; overflow: hidden; }
            .data-table td { padding: 10px;  position: relative;border: 1px solid #eee; }
            .data-table td::before { content: attr(data-label); position: absolute; left: 10px; width: 45%; text-align: left; font-weight: bold; color: var(--primary-color); }
        }