:root {
            --blue: #2563eb;
            --blue-dark: #1d4ed8;
            --slate-900: #0f172a;
            --slate-700: #334155;
            --slate-500: #64748b;
            --slate-200: #e2e8f0;
            --slate-100: #f1f5f9;
            --slate-50: #f8fafc;
            --white: #fff;
            --amber: #f59e0b;
            --emerald: #10b981;
            --violet: #7c3aed;
            --radius-xl: 24px;
            --radius-lg: 16px;
            --radius-full: 50px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 20px 40px rgba(0,0,0,0.10);
            --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: var(--font-stack);
            background: var(--slate-50);
            color: var(--slate-900);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* 导航栏 - 与首页完全一致 */
        header {
            background: rgba(255,255,255,0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            flex-wrap: wrap;
            gap: 12px;
        }
        .logo {
            font-size: 1.65rem;
            font-weight: 800;
            background: linear-gradient(135deg, #1e293b, #2563eb);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; font-size: 0.95rem; }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: var(--slate-700);
            transition: color 0.2s;
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active { color: var(--blue); }

        /* 按钮 */
        .btn {
            display: inline-block;
            font-weight: 600;
            padding: 13px 28px;
            border-radius: var(--radius-full);
            text-decoration: none;
            transition: all 0.25s;
            cursor: pointer;
            border: none;
            font-size: 0.95rem;
            text-align: center;
        }
        .btn-primary { background: var(--blue); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.25); }
        .btn-primary:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); }
        .btn-secondary { background: var(--slate-100); color: var(--slate-700); border: 1px solid var(--slate-200); }
        .btn-secondary:hover { background: #fff; border-color: var(--blue); }
        .btn-outline { background: transparent; color: var(--blue); border: 1.5px solid var(--blue); }
        .btn-outline:hover { background: #eff6ff; transform: translateY(-2px); }
        .btn-white { background: #fff; color: var(--slate-900); box-shadow: var(--shadow-md); }
        .btn-white:hover { background: #f1f5f9; }

        /* Hero */
        .page-hero {
            padding: 56px 0 40px;
            text-align: center;
            background: linear-gradient(160deg, #eff6ff 0%, #f0f9ff 40%, #faf5ff 100%);
        }
        .page-title { font-size: 2.4rem; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px; color: var(--slate-900); }
        .page-subtitle { color: var(--slate-500); font-size: 1.05rem; max-width: 700px; margin: 0 auto; }

        /* 高频问题入口 */
        .quick-issues {
            padding: 30px 0 20px;
        }
        .quick-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }
        .quick-pill {
            background: #fff;
            border-radius: var(--radius-full);
            padding: 10px 20px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--slate-700);
            text-decoration: none;
            box-shadow: var(--shadow-sm);
            transition: all 0.2s;
            border: 1px solid var(--slate-200);
        }
        .quick-pill:hover {
            border-color: var(--blue);
            color: var(--blue);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* 问题分类区域 */
        .faq-category { padding: 40px 0; }
        .cat-title {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .cat-sub {
            color: var(--slate-500);
            margin-bottom: 28px;
            font-size: 0.95rem;
        }
        .faq-list { display: flex; flex-direction: column; gap: 16px; }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--slate-100);
            transition: all 0.2s;
            overflow: hidden;
        }
        .faq-item:hover { border-color: var(--slate-200); }
        .faq-item summary {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--slate-900);
            background: #fff;
            transition: background 0.2s;
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--blue);
            font-weight: 700;
            transition: transform 0.3s;
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-item[open] summary { background: #f8fafc; }
        .faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 24px;
            font-size: 0.9rem;
            color: var(--slate-500);
            line-height: 1.7;
        }
        .tool-solutions {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 16px;
            margin-top: 16px;
        }
        .tool-solution {
            background: #f8fafc;
            border-radius: var(--radius-lg);
            padding: 18px;
            border: 1px solid var(--slate-200);
            transition: all 0.2s;
        }
        .tool-solution:hover { border-color: var(--blue); background: #fff; }
        .tool-solution .tool-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.75rem;
            margin-bottom: 8px;
        }
        .badge-shadow { background: #eff6ff; color: var(--blue); }
        .badge-clash { background: #fef3c7; color: #b45309; }
        .badge-v2ray { background: #ecfdf5; color: #047857; }
        .tool-solution p { margin: 6px 0; font-size: 0.85rem; color: var(--slate-700); }
        .tool-solution strong { font-size: 0.92rem; display: block; margin-bottom: 4px; }
        .faq-answer a { color: var(--blue); font-weight: 500; }

        /* 搜索词扩展区 */
        .related-search { padding: 40px 0; }
        .search-pills {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .search-pill {
            background: #fff;
            border: 1px solid var(--slate-200);
            border-radius: 30px;
            padding: 8px 18px;
            font-size: 0.85rem;
            color: var(--slate-700);
            cursor: default;
            transition: all 0.2s;
        }
        .search-pill:hover { border-color: var(--blue); color: var(--blue); }

        /* 更新提醒 */
        .update-note {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 28px 24px;
            margin: 30px 0;
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            gap: 16px;
            border-left: 5px solid var(--emerald);
        }
        .update-note .icon { font-size: 2rem; }

        /* CTA */
        .cta-section {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(105deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
            margin-top: 30px;
        }
        .cta-section h2 { font-size: 1.8rem; margin-bottom: 12px; letter-spacing: -0.5px; }
        .cta-section p { opacity: 0.85; margin-bottom: 24px; font-size: 0.95rem; }
        .cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

        /* Footer */
        footer { background: #0f172a; color: #94a3b8; padding: 40px 0 20px; font-size: 0.85rem; }
        .footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 28px; margin-bottom: 24px; }
        .footer-content h4 { color: #fff; margin-bottom: 10px; font-size: 0.9rem; }
        .footer-content ul { list-style: none; }
        .footer-content ul li { margin-bottom: 6px; }
        .footer-content ul li a { color: #94a3b8; text-decoration: none; transition: color 0.2s; }
        .footer-content ul li a:hover { color: #fff; }
        .footer-copyright { text-align: center; padding-top: 20px; border-top: 1px solid #1e293b; font-size: 0.8rem; }

        @media (max-width: 768px) {
            .page-title { font-size: 1.8rem; }
            nav { flex-direction: column; align-items: flex-start; }
            .nav-links { gap: 14px; font-size: 0.88rem; }
            .tool-solutions { grid-template-columns: 1fr; }
        }