:root {
            --accent: #0d9488;
            --accent-dark: #0f766e;
            --accent-light: #f0fdfa;
            --accent-glow: rgba(13, 148, 136, 0.10);
            --accent-soft: #f0fdfa;
            --accent-warm: #f59e0b;
            --accent-warm-light: #fffbeb;
            --bg: #f8faf9;
            --surface: #ffffff;
            --text: #0f172a;
            --text-secondary: #334155;
            --text-muted: #64748b;
            --border: #dce7e5;
            --border-light: #e8f0ed;
            --shadow-sm: 0 1px 4px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.09);
            --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12);
            --radius-sm: 14px;
            --radius-md: 22px;
            --radius-lg: 34px;
            --radius-xl: 46px;
            --radius-full: 999px;
            --transition: 0.20s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: 'Inter', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-stack);
            background: var(--bg);
            color: var(--text);
            line-height: 1.68;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image:
                radial-gradient(ellipse at 8% 4%, rgba(13, 148, 136, 0.028) 0%, transparent 58%),
                radial-gradient(ellipse at 82% 50%, rgba(245, 158, 11, 0.020) 0%, transparent 50%),
                radial-gradient(ellipse at 30% 84%, rgba(13, 148, 136, 0.014) 0%, transparent 44%);
            background-attachment: fixed;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 26px;
        }
        header {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            position: sticky;
            top: 0;
            z-index: 120;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 0;
            gap: 10px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #0d9488, #0f766e);
            border-radius: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            letter-spacing: -0.5px;
            box-shadow: 0 4px 14px rgba(13, 148, 136, 0.30);
        }
        .logo-text {
            font-weight: 780;
            font-size: 1.3rem;
            color: var(--text);
            letter-spacing: -0.35px;
        }
        .logo-text span {
            color: var(--accent);
        }
        .nav-links {
            display: flex;
            gap: 5px;
            align-items: center;
            flex-wrap: wrap;
            font-size: 0.91rem;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: var(--text-secondary);
            transition: var(--transition);
            padding: 7px 15px;
            border-radius: var(--radius-full);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent);
            background: var(--accent-light);
        }
        .btn-download-nav {
            background: var(--accent) !important;
            color: #fff !important;
            padding: 9px 21px !important;
            border-radius: var(--radius-full) !important;
            font-weight: 600 !important;
            box-shadow: 0 3px 12px rgba(13, 148, 136, 0.26);
            transition: var(--transition) !important;
        }
        .btn-download-nav:hover {
            background: var(--accent-dark) !important;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(13, 148, 136, 0.34);
        }
        .section {
            padding: 38px 0 44px;
        }
        .section-title {
            text-align: center;
            font-size: clamp(1.55rem, 2.8vw, 2rem);
            font-weight: 750;
            margin-bottom: 10px;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 34px;
            font-size: 0.95rem;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 48px;
            height: 3.5px;
            background: var(--accent);
            border-radius: 3px;
            margin: 12px auto 0;
        }

        /* Hero 搜索区 */
        .hero-faq {
            text-align: center;
            padding: 54px 0 40px;
        }
        .hero-faq h1 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 850;
            letter-spacing: -0.5px;
            margin-bottom: 10px;
            color: var(--text);
        }
        .hero-faq h1 .accent {
            color: var(--accent);
            position: relative;
            display: inline-block;
        }
        .hero-faq h1 .accent::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            width: 100%;
            height: 7px;
            background: rgba(13, 148, 136, 0.17);
            border-radius: 3px;
            z-index: -1;
        }
        .hero-faq .search-box {
            max-width: 580px;
            margin: 24px auto 20px;
            background: var(--surface);
            border-radius: var(--radius-full);
            padding: 12px 22px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .hero-faq .search-box input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 0.98rem;
            color: var(--text);
            background: transparent;
            font-family: var(--font-stack);
        }
        .hero-faq .search-box input::placeholder {
            color: var(--text-muted);
        }
        .hero-faq .search-box .search-icon {
            font-size: 1.3rem;
            color: var(--accent);
        }
        .hot-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-top: 16px;
        }
        .hot-tag {
            font-size: 0.82rem;
            padding: 6px 15px;
            border-radius: var(--radius-full);
            background: var(--accent-light);
            color: var(--accent);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            white-space: nowrap;
        }
        .hot-tag:hover {
            background: var(--accent);
            color: #fff;
        }

        /* 问题导航卡片 */
        .nav-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 14px;
            max-width: 960px;
            margin: 0 auto;
        }
        .nav-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 20px 16px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 8px;
            align-items: center;
        }
        .nav-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .nav-card .nav-emoji {
            font-size: 2rem;
        }
        .nav-card .nav-label {
            font-weight: 650;
            font-size: 0.92rem;
        }

        /* 专题区域 */
        .topic-section {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            margin-bottom: 24px;
            max-width: 960px;
            margin-left: auto;
            margin-right: auto;
        }
        .topic-section h3 {
            font-size: 1.28rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .faq-list details {
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            padding: 6px 18px;
            transition: var(--transition);
        }
        .faq-list details[open] {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
            padding-bottom: 12px;
        }
        .faq-list summary {
            font-weight: 650;
            font-size: 0.95rem;
            cursor: pointer;
            padding: 14px 0;
            color: var(--text);
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            outline: none;
        }
        .faq-list summary::-webkit-details-marker {
            display: none;
        }
        .faq-list summary::after {
            content: '+';
            font-size: 1.3rem;
            font-weight: 300;
            color: var(--accent);
            transition: transform 0.3s ease;
            margin-left: 10px;
        }
        .faq-list details[open] summary::after {
            content: '−';
            transform: rotate(180deg);
        }
        .faq-answer {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            padding: 2px 0 8px;
        }
        .topic-cta {
            margin-top: 18px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            justify-content: flex-start;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 20px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.88rem;
            text-decoration: none;
            background: var(--accent-light);
            color: var(--accent);
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .btn-outline:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        /* 下载引导卡片 */
        .dl-guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 16px;
            max-width: 960px;
            margin: 0 auto;
        }
        .dl-guide-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 26px 20px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
            gap: 9px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .dl-guide-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .dl-guide-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        }
        .dl-guide-card:hover::after {
            transform: scaleX(1);
        }
        .dl-guide-card .dl-icon {
            font-size: 2rem;
        }
        .dl-guide-card h4 {
            font-weight: 720;
            font-size: 1rem;
        }
        .dl-guide-card .dl-desc {
            font-size: 0.82rem;
            color: var(--text-muted);
            flex: 1;
        }
        .dl-guide-card .dl-btn {
            font-weight: 620;
            color: var(--accent);
            font-size: 0.86rem;
            display: flex;
            align-items: center;
            gap: 4px;
            margin-top: auto;
        }

        /* 文章卡片 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 14px;
            max-width: 960px;
            margin: 0 auto;
        }
        .article-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 20px 18px;
            border: 1px solid var(--border-light);
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .article-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .article-card h4 {
            font-size: 0.95rem;
            font-weight: 650;
        }
        .article-card p {
            font-size: 0.8rem;
            color: var(--text-muted);
            flex: 1;
        }
        .article-card .read-more {
            font-weight: 600;
            color: var(--accent);
            font-size: 0.82rem;
        }

        /* 代码块 */
        .code-block {
            background: #0f172a;
            color: #e2e8f0;
            border-radius: var(--radius-md);
            padding: 18px 20px;
            margin: 14px 0;
            font-family: 'JetBrains Mono', 'Fira Code', monospace;
            font-size: 0.8rem;
            line-height: 1.7;
            overflow-x: auto;
            box-shadow: var(--shadow-sm);
            white-space: pre;
        }
        .code-block .comment {
            color: #94a3b8;
        }
        .code-block .key {
            color: #67e8f9;
        }
        .code-block .str {
            color: #a5f0c5;
        }
        .code-block .accent-code {
            color: #f59e0b;
        }

        /* Footer */
        .footer {
            background: #0f1a18;
            color: #b0c4c0;
            padding: 40px 0 20px;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 28px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 10px;
            font-size: 0.93rem;
            letter-spacing: -0.12px;
        }
        .footer-col a {
            color: #b0c4c0;
            text-decoration: none;
            display: block;
            margin-bottom: 5px;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 26px;
            font-size: 0.8rem;
            border-top: 1px solid #1e302c;
            margin-top: 20px;
            color: #7a968e;
        }
        .footer-disclaimer {
            text-align: center;
            font-size: 0.74rem;
            color: #5e7a72;
            margin-top: 8px;
            line-height: 1.5;
        }
        .footer-seo-matrix {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid #1e302c;
        }
        .footer-seo-matrix a {
            color: #8aa89e;
            text-decoration: none;
            font-size: 0.78rem;
            padding: 4px 11px;
            border-radius: var(--radius-full);
            transition: var(--transition);
            background: rgba(255, 255, 255, 0.03);
            white-space: nowrap;
        }
        .footer-seo-matrix a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }

        /* Responsive */
        @media (max-width: 900px) {
            .nav-bar {
                flex-direction: column;
                align-items: stretch;
            }
            .nav-links {
                gap: 4px;
                font-size: 0.82rem;
            }
            .nav-links a {
                padding: 6px 11px;
            }
            .topic-section {
                padding: 22px 16px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
            .hero-faq h1 {
                font-size: 1.7rem;
            }
            .dl-guide-grid,
            .article-grid {
                grid-template-columns: 1fr;
            }
        }