/* roulang page: index */
:root {
            --brand: #22d3ee;
            --accent: #a855f7;
            --bg: #0b0f1a;
            --surface: #111827;
            --surface-light: #1e293b;
            --border: rgba(148, 163, 184, 0.15);
            --text: #f1f5f9;
            --text-muted: #94a3b8;
            --radius-lg: 20px;
            --radius-md: 14px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(34, 211, 238, 0.2);
            --space-section: 96px;
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.65;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
        img { max-width: 100%; display: block; }
        button { font-family: inherit; cursor: pointer; }

        .container-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container-page { padding: 0 16px; }
        }

        .neon-text {
            text-shadow: 0 0 12px rgba(34, 211, 238, 0.7), 0 0 28px rgba(34, 211, 238, 0.35);
        }
        .neon-text-accent {
            text-shadow: 0 0 12px rgba(168, 85, 247, 0.7), 0 0 28px rgba(168, 85, 247, 0.35);
        }

        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: 0 8px 30px rgba(34, 211, 238, 0.12), 0 4px 16px rgba(0, 0, 0, 0.4);
            border-color: rgba(34, 211, 238, 0.5) !important;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #22d3ee, #0ea5e9);
            color: #0b0f1a;
            font-weight: 700;
            padding: 12px 28px;
            border-radius: 50px;
            transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
            box-shadow: 0 4px 20px rgba(34, 211, 238, 0.3);
            border: none;
            font-size: 15px;
            letter-spacing: 0.02em;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 28px rgba(34, 211, 238, 0.45);
            filter: brightness(1.08);
        }
        .btn-primary:focus-visible {
            outline: 2px solid #22d3ee;
            outline-offset: 3px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--brand);
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 50px;
            border: 1px solid rgba(34, 211, 238, 0.5);
            transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            font-size: 15px;
        }
        .btn-secondary:hover {
            background: rgba(34, 211, 238, 0.1);
            border-color: rgba(34, 211, 238, 0.8);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.15);
        }
        .btn-secondary:focus-visible {
            outline: 2px solid #22d3ee;
            outline-offset: 3px;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            background: rgba(34, 211, 238, 0.1);
            border: 1px solid rgba(34, 211, 238, 0.3);
            padding: 4px 14px;
            border-radius: 30px;
            letter-spacing: 0.05em;
            text-transform: uppercase;
        }

        .card-glass {
            background: rgba(17, 24, 39, 0.8);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
        }

        .stat-number {
            font-size: 42px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.1;
            letter-spacing: -0.02em;
        }
        .stat-number span {
            color: var(--brand);
            font-size: 24px;
            margin-left: 2px;
        }

        .faq-details {
            background: rgba(17, 24, 39, 0.6);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 0;
            overflow: hidden;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .faq-details[open] {
            border-color: rgba(34, 211, 238, 0.4);
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.08);
        }
        .faq-details summary {
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--text);
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: color 0.2s ease;
        }
        .faq-details summary::-webkit-details-marker { display: none; }
        .faq-details summary:hover { color: var(--brand); }
        .faq-details summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 13px;
            color: var(--brand);
            transition: transform 0.3s ease;
        }
        .faq-details[open] summary::after { transform: rotate(180deg); }
        .faq-details .faq-body {
            padding: 0 24px 20px;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
        }

        .hero-bg {
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
        }
        .hero-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 15, 26, 0.96) 0%, rgba(11, 15, 26, 0.85) 40%, rgba(34, 211, 238, 0.15) 100%);
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 70% 50%, rgba(168, 85, 247, 0.1) 0%, transparent 60%);
        }
        .hero-content { position: relative; z-index: 1; }

        .cta-bg {
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 15, 26, 0.95), rgba(17, 24, 39, 0.85));
        }
        .cta-bg > * { position: relative; z-index: 1; }

        .nav-link {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: #cbd5e1;
            transition: color 0.2s ease;
            border-radius: 6px;
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-active {
            color: var(--brand) !important;
            text-shadow: 0 0 10px rgba(34, 211, 238, 0.5);
        }
        .nav-active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 12px;
            right: 12px;
            height: 2px;
            background: var(--brand);
            box-shadow: 0 0 12px var(--brand);
            border-radius: 2px;
        }

        .header-underline {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.5), rgba(168, 85, 247, 0.5), transparent);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(168, 85, 247, 0.15));
            border: 1px solid rgba(34, 211, 238, 0.25);
            color: var(--brand);
            font-size: 18px;
            transition: transform 0.2s ease;
        }
        .feature-cardn:hover .feature-icon {
            transform: scale(1.1) rotate(-5deg);
        }

        .mobile-menu-links a {
            display: block;
            padding: 14px 20px;
            font-size: 16px;
            font-weight: 500;
            color: #cbd5e1;
            border-bottom: 1px solid rgba(148, 163, 184, 0.08);
            transition: background 0.2s ease, color 0.2s ease;
        }
        .mobile-menu-links a:hover {
            background: rgba(34, 211, 238, 0.05);
            color: var(--brand);
        }

        .category-card-img {
            position: relative;
            overflow: hidden;
            border-radius: 20px;
        }
        .category-card-img img {
            transition: transform 0.4s ease;
        }
        .category-cardn:hover .category-card-img img {
            transform: scale(1.05);
        }
        .category-card-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(11, 15, 26, 0.5), transparent 60%);
        }

        .grid-pattern {
            background-image: radial-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px);
            background-size: 24px 24px;
        }

        .footer-link {
            color: #94a3b8;
            transition: color 0.2s ease, text-shadow 0.2s ease;
        }
        .footer-link:hover {
            color: var(--brand);
        }

        ::selection {
            background: rgba(34, 211, 238, 0.3);
            color: #fff;
        }
        ::-webkit-scrollbar {
            width: 8px;
            background: #0b0f1a;
        }
        ::-webkit-scrollbar-thumb {
            background: #334155;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #22d3ee;
        }

/* roulang page: article */
:root {
            --brand: #22d3ee;
            --accent: #a855f7;
            --night-bg: #060a15;
            --night-900: #0b1120;
            --night-800: #101a2e;
            --night-700: #1a2744;
            --text-main: #f8fafc;
            --text-sub: #94a3b8;
            --text-weak: #64748b;
            --border-subtle: rgba(255, 255, 255, 0.07);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --shadow-glow: 0 0 30px rgba(34, 211, 238, 0.25);
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background-color: var(--night-bg);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input {
            font-family: inherit;
            outline: none;
        }

        .container-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        @media (max-width: 768px) {
            .container-page {
                padding: 0 1.25rem;
            }
        }

        @media (max-width: 520px) {
            .container-page {
                padding: 0 1rem;
            }
        }

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(8, 13, 26, 0.92);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .nav-link {
            position: relative;
            color: var(--text-sub);
            font-size: 0.95rem;
            font-weight: 500;
            letter-spacing: 0.01em;
            padding: 0.4rem 0.6rem;
            transition: color 0.3s ease;
        }

        .nav-link:hover {
            color: var(--text-main);
        }

        .nav-link.nav-active {
            color: var(--brand);
        }

        .nav-link.nav-active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 15%;
            width: 70%;
            height: 2px;
            background: linear-gradient(90deg, var(--brand), var(--accent));
            border-radius: 999px;
            box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, var(--brand), var(--accent));
            color: #080d1a;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 0.6rem 1.25rem;
            border-radius: 999px;
            box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.5);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 0 16px rgba(34, 211, 238, 0.4);
        }

        .btn-primary:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            border: 1px solid rgba(34, 211, 238, 0.4);
            color: var(--brand);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 0.6rem 1.25rem;
            border-radius: 999px;
            background: transparent;
            transition: all 0.3s ease;
        }

        .btn-outline:hover {
            background: rgba(34, 211, 238, 0.1);
            border-color: var(--brand);
            box-shadow: 0 0 16px rgba(34, 211, 238, 0.2);
        }

        /* ===== 移动端菜单 ===== */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-main);
            cursor: pointer;
            padding: 0.4rem;
        }

        .mobile-menu-panel {
            display: none;
            background: var(--night-900);
            border-top: 1px solid var(--border-subtle);
            padding: 1rem 1.25rem;
            flex-direction: column;
            gap: 0.25rem;
        }

        .mobile-menu-panel.open {
            display: flex;
        }

        .mobile-menu-panel a {
            padding: 0.7rem 0.75rem;
            border-radius: 0.6rem;
            color: var(--text-sub);
            font-size: 0.95rem;
        }

        .mobile-menu-panel a:hover {
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-main);
        }

        .mobile-menu-panel a.active {
            color: var(--brand);
            background: rgba(34, 211, 238, 0.08);
        }

        @media (max-width: 820px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu-btn {
                display: flex;
                align-items: center;
                justify-content: center;
            }
        }

        /* ===== 文章 Hero ===== */
        .article-hero {
            background: linear-gradient(135deg, rgba(6, 10, 21, 0.92), rgba(16, 18, 46, 0.85)), url('/assets/images/backpic/back-1.png') no-repeat center center / cover;
            padding: 6rem 0 4.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            position: relative;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.4), rgba(168, 85, 247, 0.4), transparent);
        }

        .hero-category {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(34, 211, 238, 0.12);
            border: 1px solid rgba(34, 211, 238, 0.25);
            color: var(--brand);
            font-size: 0.8rem;
            font-weight: 500;
            padding: 0.25rem 0.8rem;
            border-radius: 999px;
            letter-spacing: 0.02em;
        }

        .hero-title {
            font-size: 2.4rem;
            font-weight: 900;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin: 1.25rem 0 1rem;
            max-width: 820px;
            color: #fff;
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1.25rem;
            color: var(--text-sub);
            font-size: 0.9rem;
        }

        .hero-meta-item {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }

        @media (max-width: 768px) {
            .article-hero {
                padding: 4rem 0 3rem;
            }
            .hero-title {
                font-size: 1.75rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.45rem;
            }
            .hero-meta {
                gap: 0.75rem;
            }
        }

        /* ===== 文章正文 ===== */
        .article-prose {
            font-size: 1.0625rem;
            line-height: 1.9;
            color: #cbd5e1;
        }

        .article-prose h2 {
            font-size: 1.75rem;
            font-weight: 700;
            margin-top: 2.8rem;
            margin-bottom: 1.1rem;
            color: #f8fafc;
            letter-spacing: -0.01em;
            position: relative;
            padding-left: 0.5rem;
            border-left: 3px solid var(--brand);
            border-radius: 0 0.25rem 0.25rem 0;
        }

        .article-prose h3 {
            font-size: 1.375rem;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: #f8fafc;
        }

        .article-prose p {
            margin-bottom: 1.5rem;
            color: #cbd5e1;
        }

        .article-prose img {
            border-radius: var(--radius-lg);
            margin: 2rem 0;
            box-shadow: var(--shadow-card);
        }

        .article-prose a {
            color: var(--brand);
            text-decoration: underline;
            text-decoration-color: rgba(34, 211, 238, 0.4);
            text-underline-offset: 4px;
            transition: all 0.2s;
        }

        .article-prose a:hover {
            color: #67e8f9;
            text-decoration-color: #67e8f9;
        }

        .article-prose blockquote {
            border-left: 3px solid var(--brand);
            background: rgba(34, 211, 238, 0.04);
            padding: 1rem 1.25rem;
            border-radius: 0 0.75rem 0.75rem 0;
            margin: 1.75rem 0;
            color: var(--text-sub);
            font-style: italic;
        }

        .article-prose ul {
            margin: 1.5rem 0;
            padding-left: 1.25rem;
        }

        .article-prose ol {
            margin: 1.5rem 0;
            padding-left: 1.5rem;
        }

        .article-prose li {
            margin-bottom: 0.6rem;
            color: #cbd5e1;
        }

        .article-prose ul li {
            position: relative;
            padding-left: 0.5rem;
        }

        .article-prose ul li::before {
            content: '';
            position: absolute;
            left: -1.25rem;
            top: 0.65rem;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--brand), var(--accent));
        }

        .article-prose table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            font-size: 0.95rem;
            border-radius: 0.75rem;
            overflow: hidden;
        }

        .article-prose th {
            background: var(--night-800);
            color: #f1f5f9;
            padding: 0.75rem 1rem;
            text-align: left;
            font-weight: 600;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .article-prose td {
            padding: 0.75rem 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            color: #cbd5e1;
        }

        .article-prose tr:last-child td {
            border-bottom: none;
        }

        /* ===== 侧边栏卡片 ===== */
        .sidebar-card {
            background: linear-gradient(180deg, rgba(16, 26, 46, 0.9), rgba(11, 17, 32, 0.95));
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.75rem;
            margin-bottom: 1.5rem;
            transition: border-color 0.3s ease;
        }

        .sidebar-card:hover {
            border-color: rgba(34, 211, 238, 0.3);
        }

        .sidebar-title {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1.25rem;
        }

        .sidebar-title i {
            color: var(--brand);
            font-size: 1rem;
        }

        .category-list-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.65rem 0.75rem;
            border-radius: 0.6rem;
            transition: all 0.25s ease;
            border: 1px solid transparent;
            color: var(--text-sub);
        }

        .category-list-item:hover {
            background: rgba(34, 211, 238, 0.06);
            border-color: rgba(34, 211, 238, 0.2);
            color: var(--brand);
        }

        .recent-item {
            display: block;
            padding: 0.75rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            transition: all 0.25s ease;
        }

        .recent-item:last-child {
            border-bottom: none;
        }

        .recent-item:hover {
            padding-left: 0.4rem;
        }

        .recent-item .recent-title {
            display: block;
            color: #cbd5e1;
            font-size: 0.92rem;
            line-height: 1.5;
            font-weight: 500;
            margin-bottom: 0.3rem;
            transition: color 0.2s;
        }

        .recent-item:hover .recent-title {
            color: var(--brand);
        }

        .recent-item .recent-meta {
            font-size: 0.78rem;
            color: var(--text-weak);
        }

        /* ===== 相关文章卡片 ===== */
        .related-card {
            background: linear-gradient(180deg, rgba(16, 26, 46, 0.85), rgba(11, 17, 32, 0.95));
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all 0.35s ease;
        }

        .related-card:hover {
            transform: translateY(-4px);
            border-color: rgba(34, 211, 238, 0.35);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 20px rgba(34, 211, 238, 0.08);
        }

        .related-card .cover-wrap {
            height: 170px;
            overflow: hidden;
            position: relative;
        }

        .related-card .cover-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .related-card:hover .cover-wrap img {
            transform: scale(1.05);
        }

        .related-card .cover-wrap::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(11, 17, 32, 0.6));
        }

        .related-card .related-body {
            padding: 1.25rem 1.25rem 1.5rem;
        }

        .related-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--brand);
            background: rgba(34, 211, 238, 0.1);
            border: 1px solid rgba(34, 211, 238, 0.2);
            padding: 0.2rem 0.6rem;
            border-radius: 999px;
            margin-bottom: 0.75rem;
        }

        .related-title {
            font-size: 1rem;
            font-weight: 700;
            color: #f1f5f9;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color 0.25s;
        }

        .related-card:hover .related-title {
            color: var(--brand);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.08), rgba(168, 85, 247, 0.08)), url('/assets/images/backpic/back-2.png') no-repeat center center / cover;
            border-radius: var(--radius-xl);
            border: 1px solid rgba(34, 211, 238, 0.2);
            padding: 4rem 3rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--brand), var(--accent), transparent);
        }

        @media (max-width: 640px) {
            .cta-section {
                padding: 2.5rem 1.5rem;
            }
        }

        /* ===== 页脚 ===== */
        .footer-link {
            color: var(--text-sub);
            transition: all 0.25s ease;
        }

        .footer-link:hover {
            color: var(--brand);
            padding-left: 4px;
        }

        .footer-link i {
            display: inline-block;
            transition: transform 0.25s ease;
        }

        .footer-link:hover i {
            transform: translateX(3px);
        }

        /* ===== 徽章/标签 ===== */
        .badge-gradient {
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.18));
            border: 1px solid rgba(34, 211, 238, 0.3);
            color: var(--brand);
            font-size: 0.72rem;
            font-weight: 600;
            padding: 0.28rem 0.7rem;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            letter-spacing: 0.02em;
        }

        .badge-gradient:hover {
            box-shadow: 0 0 14px rgba(34, 211, 238, 0.3);
            color: #67e8f9;
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 4rem 2rem;
            background: rgba(255, 255, 255, 0.02);
            border: 1px dashed rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-xl);
        }

        .empty-state .empty-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(34, 211, 238, 0.08);
            border: 1px solid rgba(34, 211, 238, 0.2);
            font-size: 2rem;
            color: var(--brand);
        }

        /* ===== 分享条 ===== */
        .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            border: 1px solid var(--border-subtle);
            background: rgba(255, 255, 255, 0.02);
            color: var(--text-sub);
            transition: all 0.3s ease;
        }

        .share-btn:hover {
            background: rgba(34, 211, 238, 0.1);
            border-color: rgba(34, 211, 238, 0.35);
            color: var(--brand);
            transform: translateY(-2px);
        }

        /* ===== 焦点 ===== */
        :focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== 分隔线 ===== */
        .divider-glow {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.3), rgba(168, 85, 247, 0.3), transparent);
            border: none;
            margin: 2rem 0;
        }

        /* ===== 数据高亮 ===== */
        .stat-chip {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 999px;
            padding: 0.4rem 0.9rem;
            font-size: 0.82rem;
            color: var(--text-sub);
        }

        .stat-chip i {
            color: var(--brand);
        }

/* roulang page: category1 */
:root {
            --night: #080c18;
            --night-900: #0d1424;
            --night-800: #131c30;
            --night-700: #1a2540;
            --brand: #22d3ee;
            --brand-dim: #0ea5b7;
            --accent: #a78bfa;
            --accent-dim: #7c5ef0;
            --text-main: #e6edf7;
            --text-muted: #94a3b8;
            --border-subtle: rgba(148, 163, 184, 0.15);
            --radius-xl: 1rem;
            --radius-lg: 0.75rem;
            --shadow-glow: 0 0 30px rgba(34, 211, 238, 0.12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--night);
            color: var(--text-main);
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        .container-page {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        .neon-text {
            text-shadow: 0 0 20px rgba(34, 211, 238, 0.35);
        }

        .nav-link {
            position: relative;
            padding: 0.5rem 0.25rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            letter-spacing: 0.02em;
            transition: color 0.25s ease;
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--brand), var(--accent));
            border-radius: 2px;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }
        .nav-link:hover::after {
            transform: scaleX(0.6);
        }
        .nav-active {
            color: var(--brand);
            text-shadow: 0 0 20px rgba(34, 211, 238, 0.5);
        }
        .nav-active::after {
            transform: scaleX(1);
            box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: 0.75rem;
            background: linear-gradient(135deg, var(--brand), var(--accent));
            color: #080c18;
            font-weight: 700;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 24px rgba(34, 211, 238, 0.22);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 36px rgba(34, 211, 238, 0.35);
            background: linear-gradient(135deg, #38e1f8, #b49dfa);
        }
        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: 0.75rem;
            border: 1px solid rgba(148, 163, 184, 0.25);
            color: var(--text-main);
            font-weight: 600;
            font-size: 0.95rem;
            background: rgba(255, 255, 255, 0.02);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-ghost:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(34, 211, 238, 0.05);
        }

        .tag,
        .badge,
        .tag-filter {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.375rem 0.875rem;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            transition: all 0.25s ease;
            cursor: pointer;
        }
        .tag {
            background: rgba(34, 211, 238, 0.08);
            border: 1px solid rgba(34, 211, 238, 0.25);
            color: var(--brand);
            text-decoration: none;
        }
        .tag:hover {
            background: rgba(34, 211, 238, 0.16);
            border-color: var(--brand);
            box-shadow: 0 0 14px rgba(34, 211, 238, 0.2);
        }
        .badge {
            background: rgba(167, 139, 250, 0.18);
            border: 1px solid rgba(167, 139, 250, 0.35);
            color: var(--accent);
            backdrop-filter: blur(8px);
            cursor: default;
        }
        .tag-filter {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(148, 163, 184, 0.2);
            color: var(--text-muted);
            padding: 0.5rem 1.1rem;
            font-size: 0.85rem;
            text-decoration: none;
        }
        .tag-filter:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(34, 211, 238, 0.06);
            box-shadow: 0 0 16px rgba(34, 211, 238, 0.15);
        }

        .content-card {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            overflow: hidden;
            transition: all 0.35s ease;
        }
        .content-card:hover {
            border-color: rgba(34, 211, 238, 0.45);
            box-shadow: var(--shadow-glow);
            transform: translateY(-6px);
            background: rgba(255, 255, 255, 0.03);
        }

        .stat-card {
            text-align: center;
            padding: 2.2rem 1.5rem;
            border-radius: var(--radius-xl);
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-subtle);
            transition: all 0.3s ease;
        }
        .stat-card:hover {
            border-color: rgba(34, 211, 238, 0.35);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 900;
            color: white;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.4rem;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.375rem 0.9rem;
            border-radius: 999px;
            background: rgba(34, 211, 238, 0.08);
            border: 1px solid rgba(34, 211, 238, 0.25);
            color: var(--brand);
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: 0.75rem;
        }
        .section-title {
            font-size: 1.9rem;
            font-weight: 900;
            color: white;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 0.5rem;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.5rem;
            }
        }

        .feature-card {
            display: block;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            transition: all 0.4s ease;
            text-decoration: none;
        }
        .feature-card:hover {
            border-color: rgba(167, 139, 250, 0.45);
            box-shadow: 0 0 40px rgba(167, 139, 250, 0.15);
            transform: translateY(-5px);
        }

        .faq-item {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: border-color 0.3s ease;
        }
        .faq-item:hover {
            border-color: rgba(34, 211, 238, 0.3);
        }
        .faq-toggle {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 1.25rem 1.5rem;
            text-align: left;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-main);
            background: transparent;
            border: none;
            cursor: pointer;
            transition: color 0.25s ease;
            font-family: inherit;
        }
        .faq-toggle:hover {
            color: var(--brand);
        }
        .faq-toggle i {
            color: var(--text-muted);
            transition: transform 0.35s ease, color 0.25s ease;
            flex-shrink: 0;
            margin-left: 1rem;
        }
        .faq-item.active {
            border-color: rgba(34, 211, 238, 0.35);
        }
        .faq-item.active .faq-toggle {
            color: var(--brand);
        }
        .faq-item.active .faq-toggle i {
            transform: rotate(180deg);
            color: var(--brand);
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }
        .faq-item.active .faq-content {
            max-height: 400px;
            padding: 0 1.5rem 1.35rem;
        }
        .faq-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .footer-link {
            color: var(--text-muted);
            transition: color 0.2s ease;
            text-decoration: none;
        }
        .footer-link:hover {
            color: var(--brand);
        }

        .mobile-nav-link {
            display: block;
            padding: 0.875rem 1rem;
            border-radius: 0.75rem;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-muted);
            transition: all 0.2s ease;
            text-decoration: none;
        }
        .mobile-nav-link:hover {
            background: rgba(34, 211, 238, 0.08);
            color: var(--brand);
        }
        .mobile-nav-active {
            background: rgba(34, 211, 238, 0.1);
            color: var(--brand);
            border-left: 3px solid var(--brand);
        }

        .link-arrow {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--brand);
            transition: gap 0.25s ease;
            text-decoration: none;
        }
        .link-arrow:hover {
            gap: 0.75rem;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .section-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.3), rgba(167, 139, 250, 0.3), transparent);
            border: none;
        }

        @media (max-width: 768px) {
            .container-page {
                padding-left: 1.2rem;
                padding-right: 1.2rem;
            }
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
    :root {
        --brand: #22d3ee;
        --accent: #a855f7;
        --night-900: #0a0f1e;
        --night-800: #131a2a;
        --night-700: #1c2438;
        --night-600: #28324a;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --text-muted: #64748b;
        --border-color: rgba(148, 163, 184, 0.16);
        --radius-lg: 1.25rem;
        --radius-md: 0.875rem;
        --radius-sm: 0.5rem;
        --shadow-glow: 0 0 30px rgba(34, 211, 238, 0.12);
        --shadow-glow-accent: 0 0 40px rgba(168, 85, 247, 0.14);
        --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.35);
        --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* ===== 基础 Reset ===== */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
        background-color: var(--night-900);
        color: var(--text-primary);
        line-height: 1.7;
        -webkit-font-smoothing: antialiased;
        overflow-x: hidden;
    }
    a {
        text-decoration: none;
        color: inherit;
        transition: var(--transition);
    }
    img {
        max-width: 100%;
        display: block;
    }
    button {
        cursor: pointer;
        border: none;
        background: none;
        font-family: inherit;
    }
    ul, ol {
        list-style: none;
    }
    input, textarea {
        font-family: inherit;
    }

    /* ===== 容器 ===== */
    .container-page {
        width: 100%;
        max-width: 1240px;
        margin-inline: auto;
        padding-inline: 1.5rem;
    }

    /* ===== 霓虹文字 ===== */
    .neon-text {
        text-shadow: 0 0 12px rgba(34, 211, 238, 0.4), 0 0 28px rgba(34, 211, 238, 0.15);
    }
    .neon-text-accent {
        text-shadow: 0 0 12px rgba(168, 85, 247, 0.4), 0 0 28px rgba(168, 85, 247, 0.15);
    }

    /* ===== 导航链接 ===== */
    .nav-link {
        position: relative;
        color: var(--text-secondary);
        font-size: 0.925rem;
        font-weight: 500;
        padding: 0.4rem 0.9rem;
        border-radius: 0.5rem;
        transition: var(--transition);
        letter-spacing: 0.02em;
    }
    .nav-link:hover {
        color: #fff;
        background: rgba(34, 211, 238, 0.08);
    }
    .nav-link.nav-active {
        color: var(--brand);
        background: rgba(34, 211, 238, 0.1);
        text-shadow: 0 0 20px rgba(34, 211, 238, 0.5);
    }
    .nav-link.nav-active::after {
        content: '';
        position: absolute;
        bottom: -3px;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
        height: 2px;
        background: linear-gradient(90deg, var(--brand), var(--accent));
        border-radius: 2px;
        box-shadow: 0 0 12px rgba(34, 211, 238, 0.7);
    }
    .nav-link-mobile {
        display: flex;
        align-items: center;
        padding: 0.85rem 1rem;
        border-radius: 0.75rem;
        color: var(--text-secondary);
        font-size: 0.95rem;
        font-weight: 500;
        transition: var(--transition);
        border: 1px solid transparent;
    }
    .nav-link-mobile:hover {
        color: #fff;
        background: rgba(34, 211, 238, 0.07);
        border-color: rgba(34, 211, 238, 0.15);
    }
    .nav-link-mobile.nav-active-mobile {
        color: var(--brand);
        background: rgba(34, 211, 238, 0.1);
        border-color: rgba(34, 211, 238, 0.25);
    }

    /* ===== 按钮 ===== */
    .btn-primary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        padding: 0.9rem 2rem;
        border-radius: 0.75rem;
        background: linear-gradient(135deg, var(--brand), #0891b2);
        color: #04121a;
        font-weight: 700;
        font-size: 0.95rem;
        border: none;
        transition: var(--transition);
        box-shadow: 0 0 24px rgba(34, 211, 238, 0.25);
    }
    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 0 36px rgba(34, 211, 238, 0.4);
    }
    .btn-primary:focus-visible {
        outline: 2px solid var(--brand);
        outline-offset: 3px;
    }
    .btn-ghost {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        padding: 0.9rem 2rem;
        border-radius: 0.75rem;
        background: transparent;
        color: var(--text-secondary);
        font-weight: 600;
        font-size: 0.95rem;
        border: 1px solid rgba(148, 163, 184, 0.3);
        transition: var(--transition);
    }
    .btn-ghost:hover {
        color: #fff;
        border-color: var(--brand);
        background: rgba(34, 211, 238, 0.06);
        transform: translateY(-2px);
    }
    .btn-ghost:focus-visible {
        outline: 2px solid var(--brand);
        outline-offset: 3px;
    }

    /* ===== 卡片 ===== */
    .category-card {
        position: relative;
        border-radius: var(--radius-lg);
        overflow: hidden;
        background: var(--night-800);
        border: 1px solid var(--border-color);
        transition: var(--transition);
    }
    .category-card:hover {
        transform: translateY(-8px);
        border-color: rgba(34, 211, 238, 0.3);
        box-shadow: var(--shadow-card), var(--shadow-glow);
    }
    .category-card .card-img {
        overflow: hidden;
        aspect-ratio: 16/10;
    }
    .category-card .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .category-card:hover .card-img img {
        transform: scale(1.05);
    }

    /* ===== 徽章/标签 ===== */
    .badge-tag {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0.25rem 0.75rem;
        border-radius: 999px;
        font-size: 0.75rem;
        font-weight: 600;
        background: rgba(34, 211, 238, 0.1);
        color: var(--brand);
        border: 1px solid rgba(34, 211, 238, 0.2);
        transition: var(--transition);
    }
    .badge-tag:hover {
        background: rgba(34, 211, 238, 0.2);
        border-color: rgba(34, 211, 238, 0.4);
    }
    .badge-accent {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0.25rem 0.75rem;
        border-radius: 999px;
        font-size: 0.75rem;
        font-weight: 600;
        background: rgba(168, 85, 247, 0.1);
        color: #c084fc;
        border: 1px solid rgba(168, 85, 247, 0.2);
        transition: var(--transition);
    }
    .badge-accent:hover {
        background: rgba(168, 85, 247, 0.18);
        border-color: rgba(168, 85, 247, 0.45);
    }

    /* ===== 指南列表项 ===== */
    .guide-list-item {
        display: flex;
        align-items: flex-start;
        gap: 1.25rem;
        padding: 1.5rem 1.75rem;
        border-radius: var(--radius-md);
        background: rgba(19, 26, 42, 0.6);
        border: 1px solid var(--border-color);
        transition: var(--transition);
        margin-bottom: 1rem;
    }
    .guide-list-item:hover {
        background: rgba(35, 46, 70, 0.8);
        border-color: rgba(34, 211, 238, 0.25);
        transform: translateX(6px);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
    }
    .guide-list-item .guid-index {
        flex-shrink: 0;
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 12px;
        font-weight: 800;
        font-size: 0.95rem;
        background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(168, 85, 247, 0.15));
        color: var(--brand);
        border: 1px solid rgba(34, 211, 238, 0.2);
    }

    /* ===== 特色图标块 ===== */
    .feature-item {
        display: flex;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem;
        border-radius: var(--radius-md);
        background: rgba(19, 26, 42, 0.5);
        border: 1px solid var(--border-color);
        transition: var(--transition);
    }
    .feature-item:hover {
        border-color: rgba(168, 85, 247, 0.35);
        box-shadow: var(--shadow-glow-accent);
        transform: translateY(-4px);
    }
    .feature-item .feature-icon {
        flex-shrink: 0;
        width: 48px;
        height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 14px;
        font-size: 1.2rem;
    }

    /* ===== FAQ ===== */
    .faq-item {
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        background: rgba(19, 26, 42, 0.5);
        overflow: hidden;
        margin-bottom: 1rem;
        transition: var(--transition);
    }
    .faq-item:hover {
        border-color: rgba(34, 211, 238, 0.25);
    }
    .faq-item.active {
        border-color: rgba(34, 211, 238, 0.35);
        box-shadow: var(--shadow-glow);
    }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        padding: 1.25rem 1.75rem;
        font-size: 0.95rem;
        font-weight: 600;
        color: var(--text-primary);
        text-align: left;
        transition: var(--transition);
    }
    .faq-question:hover {
        color: var(--brand);
    }
    .faq-question .faq-icon {
        flex-shrink: 0;
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 10px;
        background: rgba(34, 211, 238, 0.1);
        color: var(--brand);
        transition: var(--transition);
    }
    .faq-item.active .faq-icon {
        transform: rotate(45deg);
        background: rgba(168, 85, 247, 0.15);
        color: #c084fc;
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .faq-answer .faq-content {
        padding: 0 1.75rem 1.5rem;
        color: var(--text-secondary);
        font-size: 0.925rem;
        line-height: 1.8;
    }

    /* ===== 页脚链接 ===== */
    .footer-link {
        color: var(--text-muted);
        transition: var(--transition);
        display: inline-flex;
        align-items: center;
    }
    .footer-link:hover {
        color: var(--brand);
        transform: translateX(4px);
    }

    /* ===== 分隔线 ===== */
    .divider-glow {
        height: 1px;
        border: none;
        background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.4), rgba(168, 85, 247, 0.4), transparent);
        margin: 0;
    }

    /* ===== 滚动条 ===== */
    ::-webkit-scrollbar {
        width: 8px;
    }
    ::-webkit-scrollbar-track {
        background: var(--night-900);
    }
    ::-webkit-scrollbar-thumb {
        background: var(--night-600);
        border-radius: 8px;
    }
    ::-webkit-scrollbar-thumb:hover {
        background: #3b4b66;
    }

    /* ===== 响应式辅助 ===== */
    @media (max-width: 767px) {
        .container-page {
            padding-inline: 1.25rem;
        }
        .btn-primary,
        .btn-ghost {
            width: 100%;
        }
    }