:root {
            --primary: #10b981;
            --primary-dark: #059669;
            --primary-soft: #d1fae5;
            --primary-light: #ecfdf5;
            --slate-900: #0f172a;
            --slate-800: #1e293b;
            --slate-700: #334155;
            --slate-500: #64748b;
            --slate-300: #cbd5e1;
            --slate-100: #f1f5f9;
            --white: #ffffff;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
            --shadow-hover: 0 10px 15px -3px rgba(5,150,105,0.08), 0 4px 6px -4px rgba(5,150,105,0.04);
            --transition: 0.2s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
            color: var(--slate-800); line-height: 1.6; background-color: var(--white);
            -webkit-font-smoothing: antialiased;
        }
        /* 头部导航（与首页一致） */
        header {
            position: sticky; top: 0; background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--slate-300); z-index: 1000;
        }
        .header-box {
            max-width: 1200px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            padding: 14px 24px; gap: 20px;
        }
        .brand-logo {
            display: flex; align-items: center; gap: 10px;
            text-decoration: none; color: var(--slate-900);
            font-weight: 700; font-size: 1.35rem; letter-spacing: -0.3px; white-space: nowrap;
        }
        .brand-logo img { width: 36px; height: 36px; }
        nav { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
        nav a {
            text-decoration: none; color: var(--slate-700);
            font-size: 0.95rem; font-weight: 500; transition: color var(--transition); white-space: nowrap;
        }
        nav a:hover { color: var(--primary-dark); }
        nav a.current-tab {
            color: var(--primary); font-weight: 600;
            border-bottom: 2px solid var(--primary); padding-bottom: 4px;
        }
        .nav-accent {
            background-color: var(--primary); color: white !important;
            padding: 8px 18px; border-radius: 20px; font-size: 0.9rem;
            transition: background-color var(--transition);
        }
        .nav-accent:hover { background-color: var(--primary-dark); color: white !important; }

        /* FAQ 主体 */
        .faq-page {
            max-width: 960px; margin: 0 auto; padding: 60px 24px 80px;
        }
        .faq-hero {
            text-align: center; margin-bottom: 50px;
        }
        .faq-hero .badge {
            display: inline-block; background: var(--primary-soft); color: var(--primary-dark);
            font-weight: 600; padding: 5px 16px; border-radius: 20px; font-size: 0.85rem;
            margin-bottom: 16px;
        }
        .faq-hero h1 {
            font-size: clamp(2rem, 5vw, 2.8rem); color: var(--slate-900);
            letter-spacing: -0.6px; margin-bottom: 16px;
        }
        .faq-hero .subtitle {
            font-size: 1.15rem; color: var(--slate-500); max-width: 700px; margin: 0 auto;
        }

        /* 分类筛选器 */
        .filter-bar {
            display: flex; justify-content: center; gap: 12px;
            flex-wrap: wrap; margin-bottom: 40px;
        }
        .filter-btn {
            padding: 10px 22px; border-radius: 30px; border: 1px solid var(--slate-300);
            background: var(--white); color: var(--slate-700); font-weight: 600;
            cursor: pointer; transition: all var(--transition); font-size: 0.9rem;
        }
        .filter-btn.active, .filter-btn:hover {
            background: var(--primary); color: white; border-color: var(--primary);
        }

        /* 手风琴 */
        .faq-list { display: flex; flex-direction: column; gap: 16px; }
        .faq-item {
            border: 1px solid var(--slate-300); border-radius: var(--radius-lg);
            background: var(--white); overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item.active {
            border-color: var(--primary); box-shadow: 0 8px 20px -8px rgba(16,185,129,0.15);
        }
        .faq-question {
            width: 100%; padding: 20px 24px; display: flex;
            justify-content: space-between; align-items: center;
            background: transparent; border: none; cursor: pointer;
            font-size: 1.05rem; font-weight: 600; color: var(--slate-800);
            text-align: left; gap: 16px;
        }
        .faq-question:hover { color: var(--primary-dark); }
        .faq-question .q-icon {
            font-size: 1.3rem; color: var(--slate-500); transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.active .q-icon { transform: rotate(45deg); color: var(--primary); }
        .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0,1,0,1);
            background: var(--slate-100);
        }
        .faq-item.active .faq-answer {
            max-height: 800px;
            transition: max-height 0.5s cubic-bezier(1,0,1,0);
        }
        .faq-answer-content {
            padding: 20px 24px 24px; font-size: 0.95rem; color: var(--slate-700); line-height: 1.7;
        }
        .faq-answer-content p { margin-bottom: 10px; }
        .faq-answer-content code {
            background: var(--primary-light); color: var(--primary-dark);
            padding: 2px 8px; border-radius: 4px; font-family: monospace; font-size: 0.9rem;
        }
        .hidden { display: none !important; }

        /* 联系社区区块 */
        .contact-community {
            margin-top: 60px; text-align: center;
            background: var(--primary-light); border-radius: var(--radius-lg);
            padding: 40px 24px; border: 1px solid var(--primary-soft);
        }
        .contact-community h3 { font-size: 1.5rem; color: var(--slate-800); margin-bottom: 10px; }
        .contact-community p { color: var(--slate-500); margin-bottom: 20px; }
        .btn-outline-green {
            display: inline-block; padding: 12px 28px; border-radius: 30px;
            border: 1.5px solid var(--primary); color: var(--primary-dark);
            font-weight: 600; text-decoration: none; transition: all var(--transition);
        }
        .btn-outline-green:hover { background: var(--primary); color: white; }

        /* 底部（与首页一致） */
        footer {
            background: var(--slate-900); color: #94a3b8;
            padding: 60px 24px 30px; border-top: 4px solid var(--primary);
        }
        .footer-wrapper { max-width: 1100px; margin: 0 auto; }
        .footer-grid {
            display: grid; grid-template-columns: repeat(4, 1fr);
            gap: 36px; border-bottom: 1px solid var(--slate-700);
            padding-bottom: 36px; margin-bottom: 28px;
        }
        .footer-section h5 { color: white; font-size: 1rem; margin-bottom: 20px; font-weight: 600; }
        .footer-section ul { list-style: none; }
        .footer-section ul li { margin-bottom: 12px; }
        .footer-section ul li a { color: #94a3b8; text-decoration: none; font-size: 0.9rem; transition: color var(--transition); }
        .footer-section ul li a:hover { color: var(--primary); }
        .footer-legal {
            display: flex; justify-content: space-between; align-items: center;
            flex-wrap: wrap; gap: 16px; font-size: 0.85rem; color: #64748b;
        }

        @media (max-width: 768px) {
            .header-box { flex-direction: column; gap: 16px; }
            nav { justify-content: center; gap: 20px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .faq-hero h1 { font-size: 2rem; }
        }
        @media (max-width: 500px) {
            .footer-grid { grid-template-columns: 1fr; }
        }