:root {
            --bg: #fef9f2;
            --surface: #ffffff;
            --text: #1e1e1e;
            --text-secondary: #5f5f5f;
            --brand: #f59e0b;
            --brand-dark: #d97706;
            --safe: #10b981;
            --warn: #ef4444;
            --border: #e5e7eb;
            --radius: 16px;
            --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "SF Pro Display", Helvetica, Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        header {
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            background: rgba(254, 249, 242, 0.9);
            backdrop-filter: blur(16px);
            z-index: 100;
        }
        .nav-wrapper {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .brand-logo svg { width: 32px; height: 32px; fill: var(--brand); }
        .brand-name { font-size: 20px; font-weight: 800; color: var(--text); letter-spacing: -0.5px; }
        .brand-badge {
            font-size: 11px; font-weight: 700; background: #fef3c7;
            color: #b45309; padding: 2px 8px; border-radius: 4px;
        }
        nav { display: flex; gap: 36px; }
        nav a {
            text-decoration: none; color: var(--text-secondary);
            font-weight: 600; font-size: 14px; transition: color 0.2s;
        }
        nav a:hover, nav a.active { color: var(--brand-dark); }

        .container { max-width: 1300px; margin: 0 auto; padding: 0 24px; }

        .page-hero {
            text-align: center; padding: 80px 0 40px;
        }
        .page-hero h1 {
            font-size: 44px; font-weight: 900; letter-spacing: -1.5px; margin-bottom: 20px;
        }
        .page-hero h1 span { color: var(--brand); }
        .page-hero p {
            font-size: 18px; color: var(--text-secondary);
            max-width: 700px; margin: 0 auto; line-height: 1.7;
        }

        /* 搜索条 */
        .search-box {
            max-width: 600px; margin: 0 auto 48px; position: relative;
        }
        .search-box input {
            width: 100%; padding: 18px 60px 18px 28px; border-radius: 40px;
            border: 1px solid var(--border); font-size: 16px;
            background: var(--surface); outline: none; transition: border-color 0.2s;
        }
        .search-box input:focus { border-color: var(--brand); }
        .search-box button {
            position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
            background: var(--text); color: #fff; border: none; width: 44px; height: 44px;
            border-radius: 50%; font-size: 20px; cursor: pointer; display: flex;
            align-items: center; justify-content: center;
        }

        /* 分类标签 */
        .category-tabs {
            display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 48px;
        }
        .cat-btn {
            background: #fff; border: 1px solid var(--border);
            padding: 10px 24px; border-radius: 40px; font-weight: 700;
            font-size: 14px; cursor: pointer; transition: all 0.2s; color: var(--text-secondary);
        }
        .cat-btn.active, .cat-btn:hover { background: var(--text); color: #fff; border-color: var(--text); }

        /* 问题列表 */
        .faq-category { display: none; }
        .faq-category.active { display: block; }
        .faq-grid {
            display: grid; grid-template-columns: repeat(2, 1fr);
            gap: 16px; margin-bottom: 20px;
        }
        @media (max-width: 700px) { .faq-grid { grid-template-columns: 1fr; } }
        details {
            background: var(--surface); border: 1px solid var(--border);
            border-radius: 14px; padding: 20px 24px; transition: border-color 0.2s;
        }
        details[open] { border-color: var(--brand); }
        summary {
            font-weight: 700; font-size: 16px; list-style: none;
            display: flex; justify-content: space-between; align-items: center; cursor: pointer;
        }
        summary::-webkit-details-marker { display: none; }
        summary::after { content: "+"; font-size: 22px; color: var(--brand); transition: transform 0.2s; }
        details[open] summary::after { content: "−"; }
        .faq-answer {
            margin-top: 16px; font-size: 14px; color: var(--text-secondary); line-height: 1.7;
        }

        /* 热门问题云 */
        .hot-topics {
            background: #fff; border: 1px solid var(--border); border-radius: 20px;
            padding: 32px; margin: 60px 0 80px; text-align: center;
        }
        .hot-topics h3 { font-size: 22px; font-weight: 800; margin-bottom: 20px; }
        .tag-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
        .tag {
            background: #fef3c7; color: #92400e; padding: 8px 18px;
            border-radius: 30px; font-weight: 600; font-size: 14px;
            text-decoration: none; transition: background 0.2s; cursor: pointer;
        }
        .tag:hover { background: #fde68a; }

        /* 联系横幅 */
        .contact-banner {
            background: #1e1e1e; color: #fbbf24; border-radius: 24px;
            padding: 48px; margin-bottom: 80px; display: flex; flex-wrap: wrap;
            gap: 32px; align-items: center; justify-content: space-between;
        }
        .contact-banner h3 { font-size: 28px; font-weight: 800; color: #fff; margin-bottom: 12px; }
        .contact-banner p { color: #d1d5db; max-width: 500px; line-height: 1.6; }
        .btn-contact {
            background: #f59e0b; color: #1e1e1e; padding: 14px 32px;
            border-radius: 40px; text-decoration: none; font-weight: 800;
            display: inline-flex; align-items: center; gap: 8px; transition: background 0.2s;
        }
        .btn-contact:hover { background: #fbbf24; }

        /* Footer */
        footer {
            background: #fff; border-top: 1px solid var(--border); padding: 60px 24px 40px;
        }
        .footer-grid {
            max-width: 1300px; margin: 0 auto; display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr); gap: 40px; padding-bottom: 40px;
        }
        @media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
        .footer-col h5 { font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: #9ca3af; margin-bottom: 20px; }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a { color: var(--text-secondary); text-decoration: none; font-size: 14px; }
        .footer-col a:hover { color: var(--brand-dark); }
        .footer-bottom {
            max-width: 1300px; margin: 0 auto; border-top: 1px solid var(--border);
            padding-top: 24px; display: flex; justify-content: space-between;
            font-size: 13px; color: var(--text-secondary); flex-wrap: wrap; gap: 16px;
        }
        .footer-bottom a { color: var(--text-secondary); text-decoration: none; margin-left: 20px; }

        .no-result { text-align: center; padding: 40px; color: var(--text-secondary); display: none; }