/* roulang page: index */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
            --shadow-nav: 0 2px 16px rgba(37,99,235,0.08);
            --transition: all .25s cubic-bezier(.4,0,.2,1);
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; display: block; }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        button, input, select, textarea { font-family: inherit; }

        .container-main { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }
        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226,232,240,0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }
        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }
        .nav-links::-webkit-scrollbar { display: none; }
        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }
        .nav-link:hover { background: rgba(37,99,235,0.08); color: var(--primary); }
        .nav-link.active { background: var(--primary); color: #fff; }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }
        .nav-toggle:hover { background: rgba(37,99,235,0.08); color: var(--primary); }

        /* Section base */
        .section-block { padding: 56px 0; }
        .section-block.alt-bg { background: #fff; }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }
        .badge-tag.green {
            background: rgba(22,163,74,0.10);
            color: var(--accent);
        }
        .badge-tag.dark {
            background: rgba(15,23,42,0.07);
            color: var(--ink-body);
        }

        /* Cards */
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226,232,240,0.6);
        }
        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37,99,235,0.2);
        }
        .metric-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: .02em;
            line-height: 1.2;
        }
        .metric-label {
            font-size: .85rem;
            color: var(--ink-muted);
            margin-top: 4px;
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-primary:hover { background: var(--primary-dark); box-shadow: 0 6px 16px rgba(37,99,235,0.25); transform: translateY(-1px); }
        .btn-primary:active { transform: translateY(0); }
        .btn-primary:focus-visible { outline: 3px solid rgba(37,99,235,0.4); outline-offset: 2px; }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-secondary:hover { background: rgba(37,99,235,0.06); box-shadow: 0 4px 12px rgba(37,99,235,0.10); }
        .btn-secondary:focus-visible { outline: 3px solid rgba(37,99,235,0.4); outline-offset: 2px; }

        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-green:hover { background: #15803d; box-shadow: 0 6px 16px rgba(22,163,74,0.25); }

        /* Form */
        .form-input {
            width: 100%;
            padding: 11px 14px;
            background: #fff;
            border: 1.5px solid var(--border);
            border-radius: 8px;
            font-size: .9rem;
            color: var(--ink-dark);
            transition: var(--transition);
            outline: none;
        }
        .form-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
        }
        .form-label {
            display: block;
            font-size: .85rem;
            font-weight: 600;
            color: var(--ink-body);
            margin-bottom: 6px;
        }

        /* Hero */
        .hero-section {
            padding: 48px 0 56px;
            position: relative;
        }
        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 100%;
            background: linear-gradient(135deg, rgba(37,99,235,0.06) 0%, rgba(22,163,74,0.05) 100%);
            z-index: 0;
            border-radius: 0 0 32px 32px;
            overflow: hidden;
        }
        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: .12;
            position: absolute;
            inset: 0;
        }
        .hero-content { position: relative; z-index: 1; }
        .hero-title {
            font-size: 2.35rem;
            font-weight: 800;
            color: var(--ink-dark);
            line-height: 1.25;
            letter-spacing: .01em;
            margin-bottom: 16px;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--ink-body);
            line-height: 1.85;
            margin-bottom: 24px;
            max-width: 640px;
        }
        .hero-card {
            background: var(--card-bg);
            border-radius: 16px;
            box-shadow: var(--shadow-panel);
            border: 1px solid rgba(226,232,240,0.7);
            overflow: hidden;
        }
        .hero-card-header {
            background: linear-gradient(135deg, #1e3a8a, #2563EB);
            color: #fff;
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.1rem;
            letter-spacing: .02em;
        }
        .hero-card-body { padding: 24px; }

        /* TOC */
        .toc-list { list-style: none; padding: 0; margin: 0; }
        .toc-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            font-size: .9rem;
            color: var(--ink-body);
        }
        .toc-list li:last-child { border-bottom: none; }
        .toc-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: rgba(37,99,235,0.1);
            color: var(--primary);
            font-weight: 700;
            font-size: .8rem;
            flex-shrink: 0;
        }

        /* News list */
        .news-item {
            display: flex;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid var(--border);
            align-items: flex-start;
            transition: var(--transition);
        }
        .news-item:hover { padding-left: 8px; }
        .news-item:last-child { border-bottom: none; }
        .news-img {
            width: 110px;
            height: 74px;
            border-radius: 10px;
            overflow: hidden;
            flex-shrink: 0;
            object-fit: cover;
        }
        .news-tag {
            display: inline-block;
            padding: 2px 10px;
            border-radius: 999px;
            font-size: .72rem;
            font-weight: 600;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            margin-right: 6px;
        }
        .news-date {
            font-size: .78rem;
            color: var(--ink-faint);
            margin-left: 8px;
        }
        .news-title {
            font-weight: 700;
            font-size: .95rem;
            color: var(--ink-dark);
            line-height: 1.5;
            transition: var(--transition);
        }
        .news-title:hover { color: var(--primary); }
        .news-summary {
            font-size: .84rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-top: 4px;
        }

        /* Hot list */
        .hot-rank-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            font-size: .9rem;
        }
        .hot-rank-item:last-child { border-bottom: none; }
        .rank-num {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--ink-faint);
            min-width: 28px;
            text-align: center;
        }
        .rank-num.top1 { color: #f59e0b; }
        .rank-num.top2 { color: #94a3b8; }
        .rank-num.top3 { color: #d97706; }
        .rank-title { font-weight: 600; color: var(--ink-dark); flex: 1; transition: var(--transition); }
        .rank-title:hover { color: var(--primary); }
        .rank-value { font-size: .78rem; color: var(--ink-faint); white-space: nowrap; }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--border);
            border-radius: 12px;
            background: var(--card-bg);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: rgba(37,99,235,0.25); }
        .faq-question {
            width: 100%;
            padding: 16px 20px;
            text-align: left;
            font-weight: 700;
            font-size: .95rem;
            color: var(--ink-dark);
            background: none;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: var(--transition);
        }
        .faq-question:hover { color: var(--primary); }
        .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            transition: var(--transition);
        }
        .faq-answer {
            padding: 0 20px 16px;
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-icon { transform: rotate(45deg); }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 24px;
            margin-top: 32px;
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: #fff;
            margin-bottom: 8px;
        }
        .footer-desc {
            font-size: .85rem;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-heading {
            font-weight: 700;
            font-size: .9rem;
            color: #e2e8f0;
            margin-bottom: 14px;
            letter-spacing: .04em;
        }
        .footer-link {
            display: block;
            font-size: .85rem;
            color: #94a3b8;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-link:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 32px;
            padding-top: 16px;
            font-size: .8rem;
            color: #64748b;
            text-align: center;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .container-main { padding: 0 20px; }
            .hero-title { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .section-block { padding: 40px 0; }
            .nav-shell { padding: 6px 14px; border-radius: 20px; }
            .nav-links {
                display: none;
                flex-direction: column;
                align-items: stretch;
                background: rgba(255,255,255,0.98);
                border-radius: 16px;
                padding: 8px;
                box-shadow: var(--shadow-panel);
                position: absolute;
                top: 100%;
                left: 16px;
                right: 16px;
                gap: 2px;
            }
            .nav-links.open { display: flex; }
            .nav-toggle { display: block; }
            .nav-link { padding: 10px 16px; text-align: center; }
            .hero-title { font-size: 1.7rem; }
            .metric-number { font-size: 1.5rem; }
            .news-img { width: 88px; height: 60px; }
        }
        @media (max-width: 520px) {
            .container-main { padding: 0 14px; }
            .hero-title { font-size: 1.45rem; }
            .section-title { font-size: 1.35rem; }
            .btn-primary, .btn-secondary, .btn-green { padding: 10px 18px; font-size: .87rem; }
            .news-item { flex-direction: column; }
            .news-img { width: 100%; height: 160px; }
        }

/* roulang page: category2 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-nav: 0 2px 16px rgba(37, 99, 235, 0.08);
            --transition: all .25s cubic-bezier(.4, 0, .2, 1);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }
        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* Navigation */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }
        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }
        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }
        .nav-links::-webkit-scrollbar {
            display: none;
        }
        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }
        .nav-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }
        .nav-toggle:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
        /* Section base */
        .section-block {
            padding: 56px 0;
        }
        .section-block.alt-bg {
            background: #fff;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }
        .badge-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }
        .badge-tag.dark {
            background: rgba(15, 23, 42, 0.07);
            color: var(--ink-body);
        }
        /* Cards */
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
        }
        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }
        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.10);
        }
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }
        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22, 163, 74, 0.25);
            transform: translateY(-1px);
        }
        .btn-green:focus-visible {
            outline: 3px solid rgba(22, 163, 74, 0.4);
            outline-offset: 2px;
        }
        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: .88rem;
            color: var(--ink-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--ink-faint);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        /* Article list cards */
        .article-card {
            display: flex;
            flex-direction: column;
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
            overflow: hidden;
        }
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }
        .article-card-image {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: #f1f5f9;
        }
        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease;
        }
        .article-card:hover .article-card-image img {
            transform: scale(1.04);
        }
        .article-card-body {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .article-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card-summary {
            font-size: .9rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .article-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: .8rem;
            color: var(--ink-faint);
            border-top: 1px solid var(--border);
            padding-top: 12px;
            gap: 8px;
            flex-wrap: wrap;
        }
        .article-card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .tag-chip {
            display: inline-flex;
            padding: 2px 10px;
            border-radius: 999px;
            font-size: .72rem;
            font-weight: 500;
            background: rgba(37, 99, 235, 0.07);
            color: var(--primary);
        }
        .tag-chip.green {
            background: rgba(22, 163, 74, 0.09);
            color: var(--accent);
        }
        /* Data strip */
        .data-strip {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
        }
        .data-strip-item {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 20px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            text-align: center;
        }
        .data-strip-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .data-strip-label {
            font-size: .85rem;
            color: var(--ink-muted);
        }
        /* FAQ */
        .faq-item {
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            border: 1px solid rgba(226, 232, 240, 0.6);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(37, 99, 235, 0.25);
        }
        .faq-question {
            padding: 18px 22px;
            font-weight: 700;
            font-size: .98rem;
            color: var(--ink-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: .9rem;
            color: var(--ink-muted);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-arrow {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            color: var(--ink-faint);
            transition: transform .3s ease;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 28px;
            margin-top: 40px;
        }
        .footer-brand {
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-desc {
            font-size: .9rem;
            color: #94a3b8;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .footer-heading {
            font-size: .95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-link {
            display: block;
            font-size: .88rem;
            color: #94a3b8;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-link:hover {
            color: #fff;
            transform: translateX(4px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(226, 232, 240, 0.1);
            margin-top: 32px;
            padding-top: 20px;
            font-size: .8rem;
            color: #64748b;
            text-align: center;
        }
        /* Term cards */
        .term-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 16px;
        }
        .term-card {
            background: #fff;
            border-radius: 12px;
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            padding: 20px 22px;
            transition: var(--transition);
        }
        .term-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: rgba(37, 99, 235, 0.2);
        }
        .term-card h4 {
            font-size: .95rem;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 8px;
        }
        .term-card p {
            font-size: .85rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }
        /* CTA box */
        .cta-box {
            background: linear-gradient(135deg, #1e40af 0%, #2563EB 55%, #3b82f6 100%);
            border-radius: 16px;
            padding: 40px 32px;
            color: #fff;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            box-shadow: 0 12px 32px rgba(37, 99, 235, 0.2);
        }
        .cta-box h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .cta-box p {
            font-size: .95rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            max-width: 500px;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .nav-shell {
                padding: 8px 14px;
            }
            .section-block {
                padding: 44px 0;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: calc(100% + 12px);
                left: 16px;
                right: 16px;
                background: #fff;
                border-radius: 16px;
                box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
                padding: 12px;
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                border: 1px solid var(--border);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-link {
                padding: 10px 16px;
                border-radius: 10px;
                text-align: center;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .section-block {
                padding: 32px 0;
            }
            .cta-box {
                padding: 28px 22px;
                text-align: center;
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }
            .article-card-body {
                padding: 16px 16px 18px;
            }
            .data-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .data-strip-value {
                font-size: 1.5rem;
            }
            .breadcrumb {
                font-size: .8rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-nav: 0 2px 16px rgba(37, 99, 235, 0.08);
            --transition: all .25s cubic-bezier(.4, 0, .2, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }

        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }

        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }

        .nav-links::-webkit-scrollbar {
            display: none;
        }

        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }

        .nav-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }

        .nav-toggle:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        /* Section base */
        .section-block {
            padding: 48px 0;
        }

        .section-block.alt-bg {
            background: #fff;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }

        .badge-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }

        .badge-tag.dark {
            background: rgba(15, 23, 42, 0.07);
            color: var(--ink-body);
        }

        /* Cards */
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
        }

        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.10);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22, 163, 74, 0.25);
            transform: translateY(-1px);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: .88rem;
            color: var(--ink-muted);
            flex-wrap: wrap;
            margin-bottom: 24px;
        }

        .breadcrumb a {
            color: var(--primary);
            font-weight: 500;
        }

        .breadcrumb a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .breadcrumb .sep {
            color: var(--ink-faint);
            pointer-events: none;
        }

        .breadcrumb .current {
            color: var(--ink-dark);
            font-weight: 600;
        }

        /* Category Hero */
        .category-hero {
            padding: 16px 0 32px;
        }

        .category-hero h1 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: .01em;
            margin-bottom: 10px;
            line-height: 1.3;
            color: var(--ink-dark);
        }

        .category-hero .hero-desc {
            font-size: 1.02rem;
            color: var(--ink-muted);
            max-width: 800px;
            line-height: 1.85;
        }

        /* Data ribbon */
        .data-ribbon {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .data-ribbon .ribbon-item {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            padding: 22px 20px;
            text-align: left;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .data-ribbon .ribbon-item:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .data-ribbon .ribbon-num {
            font-size: 2.1rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }

        .data-ribbon .ribbon-num.green {
            color: var(--accent);
        }

        .data-ribbon .ribbon-label {
            font-size: .9rem;
            color: var(--ink-muted);
            margin-top: 6px;
        }

        /* Featured reports */
        .featured-card {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            box-shadow: var(--shadow-card);
            padding: 20px;
            transition: var(--transition);
            height: 100%;
        }

        .featured-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .featured-card .featured-img {
            width: 115px;
            height: 115px;
            border-radius: 10px;
            object-fit: cover;
            flex-shrink: 0;
        }

        .featured-card .featured-body {
            flex: 1;
        }

        .featured-card .featured-title {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 6px;
            color: var(--ink-dark);
            line-height: 1.4;
        }

        .featured-card .featured-summary {
            font-size: .9rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-bottom: 10px;
        }

        .featured-card .featured-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: .78rem;
            color: var(--ink-faint);
        }

        /* Article list cards */
        .report-list-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }

        .report-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .report-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .report-card .card-img-wrap {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #e2e8f0;
        }

        .report-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease;
        }

        .report-card:hover .card-img-wrap img {
            transform: scale(1.04);
        }

        .report-card .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .72rem;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.92);
            color: var(--primary);
            letter-spacing: .03em;
        }

        .report-card .card-body {
            padding: 18px 18px 14px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .report-card .card-title {
            font-weight: 700;
            font-size: 1.02rem;
            line-height: 1.45;
            margin-bottom: 8px;
            color: var(--ink-dark);
            cursor: pointer;
            transition: var(--transition);
        }

        .report-card .card-title:hover {
            color: var(--primary);
        }

        .report-card .card-summary {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }

        .report-card .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: .76rem;
            color: var(--ink-faint);
            padding-top: 10px;
            border-top: 1px solid var(--border);
        }

        .report-card .card-footer .read-count {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* Term glossary */
        .term-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 16px;
        }

        .term-card {
            background: var(--card-bg);
            border-radius: 12px;
            border: 1px solid rgba(226, 232, 240, 0.7);
            padding: 18px 20px;
            transition: var(--transition);
        }

        .term-card:hover {
            border-color: rgba(37, 99, 235, 0.3);
            box-shadow: var(--shadow-card);
        }

        .term-card .term-name {
            font-weight: 700;
            font-size: .98rem;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .term-card .term-def {
            font-size: .87rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }

        /* Channel browse */
        .channel-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            gap: 14px;
        }

        .channel-link {
            background: var(--card-bg);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 12px;
            padding: 16px 18px;
            text-align: center;
            font-weight: 600;
            font-size: .93rem;
            color: var(--ink-body);
            transition: var(--transition);
            cursor: pointer;
        }

        .channel-link:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(37, 99, 235, 0.04);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }

        /* Subscribe CTA */
        .subscribe-wrap {
            background: linear-gradient(135deg, #eff6ff 0%, #ffffff 50%, #f0fdf4 100%);
            border-radius: 16px;
            border: 1px solid rgba(37, 99, 235, 0.12);
            padding: 40px 32px;
            display: flex;
            gap: 32px;
            align-items: center;
            flex-wrap: wrap;
        }

        .subscribe-wrap .sub-info {
            flex: 1;
            min-width: 260px;
        }

        .subscribe-wrap .sub-info h2 {
            font-size: 1.55rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .subscribe-wrap .sub-info p {
            color: var(--ink-muted);
            font-size: .95rem;
            line-height: 1.75;
        }

        .subscribe-form {
            display: flex;
            gap: 10px;
            flex: 1;
            min-width: 280px;
            max-width: 460px;
        }

        .subscribe-form input {
            flex: 1;
            padding: 12px 18px;
            border-radius: 10px;
            border: 1.5px solid var(--border);
            background: #fff;
            font-size: .93rem;
            color: var(--ink-dark);
            transition: var(--transition);
            outline: none;
        }

        .subscribe-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }

        .subscribe-form input::placeholder {
            color: var(--ink-faint);
        }

        .subscribe-form .btn-primary {
            flex-shrink: 0;
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #e2e8f0;
            padding: 48px 0 24px;
            margin-top: 24px;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: #fff;
            letter-spacing: .02em;
            margin-bottom: 8px;
        }

        .footer-desc {
            font-size: .88rem;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-heading {
            font-weight: 700;
            font-size: .93rem;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: .02em;
        }

        .footer-link {
            display: block;
            font-size: .87rem;
            color: #94a3b8;
            padding: 4px 0;
            transition: var(--transition);
            cursor: pointer;
        }

        .footer-link:hover {
            color: #fff;
            transform: translateX(3px);
        }

        .footer-bottom {
            margin-top: 32px;
            padding-top: 18px;
            border-top: 1px solid rgba(148, 163, 184, 0.2);
            font-size: .8rem;
            color: #94a3b8;
            text-align: center;
        }

        .footer-bottom a {
            color: #94a3b8;
            transition: var(--transition);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .data-ribbon {
                grid-template-columns: repeat(2, 1fr);
            }

            .report-list-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }

            .subscribe-wrap {
                flex-direction: column;
                align-items: stretch;
            }

            .subscribe-form {
                max-width: 100%;
            }
        }

        @media (max-width: 768px) {
            .nav-shell {
                flex-wrap: nowrap;
                padding: 8px 14px;
            }

            .nav-toggle {
                display: inline-flex;
                align-items: center;
                justify-content: center;
                flex-shrink: 0;
            }

            .nav-links {
                position: absolute;
                top: 64px;
                left: 16px;
                right: 16px;
                background: #fff;
                border-radius: 18px;
                border: 1px solid rgba(226, 232, 240, 0.8);
                box-shadow: var(--shadow-card-hover);
                flex-direction: column;
                align-items: flex-start;
                gap: 2px;
                padding: 12px;
                display: none;
                overflow-y: auto;
                max-height: 320px;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-link {
                width: 100%;
                padding: 10px 14px;
                font-size: .92rem;
            }

            .section-block {
                padding: 32px 0;
            }

            .section-title {
                font-size: 1.45rem;
            }

            .category-hero h1 {
                font-size: 1.6rem;
            }

            .data-ribbon {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }

            .data-ribbon .ribbon-num {
                font-size: 1.6rem;
            }

            .featured-card {
                flex-direction: column;
                gap: 12px;
            }

            .featured-card .featured-img {
                width: 100%;
                height: 150px;
            }

            .report-list-grid {
                grid-template-columns: 1fr;
            }

            .term-grid {
                grid-template-columns: 1fr;
            }

            .channel-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .subscribe-wrap {
                padding: 28px 20px;
            }

            .subscribe-form {
                flex-direction: column;
                gap: 12px;
            }

            .subscribe-form input {
                width: 100%;
            }

            .subscribe-form .btn-primary {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }

            .nav-shell {
                padding: 6px 10px;
                border-radius: 28px;
            }

            .brand-logo {
                font-size: 1.05rem;
            }

            .nav-links {
                top: 56px;
                left: 10px;
                right: 10px;
            }

            .data-ribbon {
                grid-template-columns: 1fr;
            }

            .channel-grid {
                grid-template-columns: 1fr;
            }

            .report-card .card-body {
                padding: 14px 14px 12px;
            }

            .report-card .card-title {
                font-size: .95rem;
            }

            .category-hero h1 {
                font-size: 1.4rem;
            }

            .section-block {
                padding: 24px 0;
            }

            .footer-bottom {
                font-size: .72rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-nav: 0 2px 16px rgba(37, 99, 235, 0.08);
            --transition: all .25s cubic-bezier(.4, 0, .2, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }

        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }

        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }

        .nav-links::-webkit-scrollbar {
            display: none;
        }

        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }

        .nav-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }

        .nav-toggle:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        .section-block {
            padding: 48px 0;
        }

        .section-block.alt-bg {
            background: #fff;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }

        .badge-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }

        .badge-tag.dark {
            background: rgba(15, 23, 42, 0.07);
            color: var(--ink-body);
        }

        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
        }

        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.10);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22, 163, 74, 0.25);
            transform: translateY(-1px);
        }

        .btn-green:focus-visible {
            outline: 3px solid rgba(22, 163, 74, 0.4);
            outline-offset: 2px;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: .88rem;
            color: var(--ink-muted);
            margin-bottom: 16px;
        }

        .breadcrumb-nav a {
            color: var(--ink-muted);
            transition: var(--transition);
        }

        .breadcrumb-nav a:hover {
            color: var(--primary);
        }

        .breadcrumb-sep {
            color: var(--ink-faint);
            user-select: none;
        }

        .breadcrumb-current {
            color: var(--primary);
            font-weight: 600;
        }

        .category-h1 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            letter-spacing: .01em;
            margin-bottom: 12px;
        }

        .category-lead {
            font-size: 1.05rem;
            color: var(--ink-body);
            line-height: 1.8;
            max-width: 780px;
        }

        .data-stat-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 18px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            text-align: center;
            transition: var(--transition);
        }

        .data-stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .data-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: .01em;
        }

        .data-stat-label {
            font-size: .88rem;
            color: var(--ink-muted);
            margin-top: 6px;
            font-weight: 500;
        }

        .article-card {
            display: flex;
            flex-direction: column;
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            overflow: hidden;
            transition: var(--transition);
        }

        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .article-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: #f1f5f9;
        }

        .article-card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-card-tag {
            display: inline-block;
            font-size: .72rem;
            font-weight: 600;
            letter-spacing: .04em;
            padding: 3px 10px;
            border-radius: 999px;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 10px;
            align-self: flex-start;
        }

        .article-card-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }

        .article-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.45;
            margin-bottom: 8px;
        }

        .article-card-desc {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }

        .article-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: .78rem;
            color: var(--ink-faint);
            border-top: 1px solid var(--border);
            padding-top: 12px;
        }

        .report-feature {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
            display: flex;
            gap: 18px;
            align-items: flex-start;
        }

        .report-feature:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .report-feature-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(37, 99, 235, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            color: var(--primary);
            font-size: 1.2rem;
            font-weight: 700;
        }

        .report-feature-icon.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }

        .report-feature-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 6px;
        }

        .report-feature-desc {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }

        .term-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 18px 20px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
        }

        .term-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .term-card h4 {
            font-size: .95rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }

        .term-card p {
            font-size: .85rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin: 0;
        }

        .cta-section {
            background: linear-gradient(135deg, #1e40af 0%, #2563EB 50%, #3b82f6 100%);
            border-radius: 16px;
            padding: 40px 32px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -50%;
            left: -5%;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            font-size: .95rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
            max-width: 560px;
        }

        .cta-section .btn-group {
            position: relative;
            z-index: 1;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cta-section .btn-white {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .cta-section .btn-white:hover {
            background: #f0f7ff;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
        }

        .cta-section .btn-outline-white {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid rgba(255, 255, 255, 0.7);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .cta-section .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }

        .footer-link {
            display: block;
            color: #cbd5e1;
            font-size: .88rem;
            margin-bottom: 8px;
            transition: var(--transition);
            cursor: pointer;
        }

        .footer-link:hover {
            color: #fff;
            transform: translateX(3px);
        }

        .footer-heading {
            font-size: .92rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: .03em;
        }

        .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: .02em;
        }

        .footer-desc {
            font-size: .85rem;
            color: #94a3b8;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 32px;
            padding-top: 20px;
            font-size: .8rem;
            color: #94a3b8;
            text-align: center;
        }

        .site-footer {
            background: #0f172a;
            color: #e2e8f0;
            padding: 48px 0 24px;
            margin-top: 48px;
        }

        .site-footer a {
            color: inherit;
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: calc(100% + 10px);
                left: 16px;
                right: 16px;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(14px);
                border-radius: 20px;
                box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
                padding: 16px;
                flex-direction: column;
                align-items: flex-start;
                gap: 4px;
                border: 1px solid rgba(226, 232, 240, 0.8);
            }

            .nav-links.open {
                display: flex;
            }

            .nav-link {
                width: 100%;
                padding: 10px 14px;
                font-size: .95rem;
            }

            .nav-shell {
                padding: 8px 14px;
                border-radius: 24px;
            }

            .category-h1 {
                font-size: 1.5rem;
            }

            .section-block {
                padding: 32px 0;
            }

            .section-title {
                font-size: 1.4rem;
            }

            .article-card-img {
                height: 160px;
            }

            .cta-section {
                padding: 28px 20px;
            }

            .cta-section h2 {
                font-size: 1.25rem;
            }

            .report-feature {
                flex-direction: column;
                gap: 12px;
                padding: 18px;
            }

            .data-stat-number {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }

            .category-h1 {
                font-size: 1.3rem;
            }

            .category-lead {
                font-size: .92rem;
            }

            .article-card-img {
                height: 140px;
            }

            .article-card-title {
                font-size: .95rem;
            }

            .article-card-desc {
                font-size: .82rem;
            }

            .section-title {
                font-size: 1.25rem;
            }

            .badge-tag {
                font-size: .7rem;
                padding: 3px 10px;
            }

            .btn-primary,
            .btn-secondary,
            .btn-green {
                padding: 10px 18px;
                font-size: .88rem;
            }

            .site-footer {
                padding: 32px 0 16px;
            }

            .footer-brand {
                font-size: 1.1rem;
            }
        }

/* roulang page: category5 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-nav: 0 2px 16px rgba(37, 99, 235, 0.08);
            --transition: all .25s cubic-bezier(.4, 0, .2, 1);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }
        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }
        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }
        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }
        .nav-links::-webkit-scrollbar {
            display: none;
        }
        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }
        .nav-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }
        .nav-toggle:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
        .section-block {
            padding: 56px 0;
        }
        .section-block.alt-bg {
            background: #fff;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }
        .badge-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }
        .badge-tag.dark {
            background: rgba(15, 23, 42, 0.07);
            color: var(--ink-body);
        }
        .badge-tag.amber {
            background: rgba(245, 158, 11, 0.12);
            color: #d97706;
        }
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
        }
        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.10);
        }
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }
        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22, 163, 74, 0.25);
            transform: translateY(-1px);
        }
        .btn-green:focus-visible {
            outline: 3px solid rgba(22, 163, 74, 0.4);
            outline-offset: 2px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: .85rem;
            color: var(--ink-muted);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--primary);
            font-weight: 500;
        }
        .breadcrumb a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        .breadcrumb span.separator {
            color: var(--ink-faint);
        }
        .breadcrumb span.current {
            color: var(--ink-body);
            font-weight: 500;
        }
        .page-h1 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--ink-dark);
            line-height: 1.3;
            letter-spacing: .01em;
            margin-bottom: 12px;
        }
        .page-intro {
            font-size: 1.05rem;
            color: var(--ink-body);
            line-height: 1.85;
            max-width: 800px;
        }
        .stat-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 20px 24px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-number.green {
            color: var(--accent);
        }
        .stat-number.amber {
            color: #d97706;
        }
        .stat-label {
            font-size: .85rem;
            color: var(--ink-muted);
            margin-top: 4px;
        }
        .article-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(226, 232, 240, 0.6);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }
        .article-card .article-cover {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #e2e8f0;
            position: relative;
        }
        .article-card .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .article-card:hover .article-cover img {
            transform: scale(1.04);
        }
        .article-card .article-body {
            padding: 18px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card .article-tag {
            display: inline-flex;
            align-items: center;
            padding: 3px 10px;
            border-radius: 999px;
            font-size: .72rem;
            font-weight: 600;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .article-card .article-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }
        .article-card .article-tag.amber {
            background: rgba(245, 158, 11, 0.12);
            color: #d97706;
        }
        .article-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.45;
            margin-bottom: 8px;
            flex: 1;
        }
        .article-card p {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.65;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .article-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: .78rem;
            color: var(--ink-faint);
            border-top: 1px solid var(--border);
            padding-top: 12px;
        }
        .term-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 20px 24px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
        }
        .term-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .term-card h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .term-card p {
            font-size: .88rem;
            color: var(--ink-body);
            line-height: 1.7;
        }
        .editor-pick {
            background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 100%);
            border: 1px solid rgba(37, 99, 235, 0.15);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .editor-pick:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .editor-pick .pick-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 1.3rem;
            font-weight: 700;
        }
        .editor-pick h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 4px;
        }
        .editor-pick p {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }
        .category-entry {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 16px 20px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .category-entry:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: rgba(37, 99, 235, 0.25);
        }
        .category-entry .entry-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--primary);
            flex-shrink: 0;
        }
        .category-entry .entry-dot.green {
            background: var(--accent);
        }
        .category-entry .entry-dot.amber {
            background: #f59e0b;
        }
        .category-entry span {
            font-weight: 600;
            font-size: .92rem;
            color: var(--ink-dark);
        }
        .category-entry small {
            font-size: .78rem;
            color: var(--ink-muted);
            display: block;
        }
        .cta-subscribe {
            background: linear-gradient(135deg, #1e40af 0%, #2563EB 50%, #3b82f6 100%);
            border-radius: 20px;
            padding: 48px 40px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-subscribe::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            pointer-events: none;
        }
        .cta-subscribe::after {
            content: '';
            position: absolute;
            bottom: -40%;
            left: -10%;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            pointer-events: none;
        }
        .cta-subscribe h2 {
            font-size: 1.6rem;
            font-weight: 800;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }
        .cta-subscribe p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
            max-width: 560px;
        }
        .cta-subscribe .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            z-index: 1;
        }
        .cta-subscribe .btn-white:hover {
            background: #f1f5f9;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 56px 0 24px;
            margin-top: 0;
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-desc {
            font-size: .88rem;
            color: #94a3b8;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .footer-heading {
            font-size: .95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-link {
            display: block;
            font-size: .85rem;
            color: #94a3b8;
            margin-bottom: 8px;
            transition: var(--transition);
        }
        .footer-link:hover {
            color: #fff;
            transform: translateX(2px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.2);
            margin-top: 40px;
            padding-top: 20px;
            font-size: .8rem;
            color: #64748b;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: space-between;
            align-items: center;
        }
        @media (max-width: 1024px) {
            .section-block {
                padding: 40px 0;
            }
            .page-h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .cta-subscribe {
                padding: 36px 28px;
            }
            .cta-subscribe h2 {
                font-size: 1.3rem;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                align-items: stretch;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                border-radius: 20px;
                box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
                padding: 12px;
                margin-top: 8px;
                overflow-y: auto;
                max-height: 70vh;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-shell {
                flex-wrap: wrap;
                position: relative;
                border-radius: 20px;
            }
            .nav-link {
                padding: 12px 16px;
                border-radius: 12px;
                font-size: 1rem;
            }
            .page-h1 {
                font-size: 1.4rem;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .editor-pick {
                flex-direction: column;
                gap: 12px;
            }
            .cta-subscribe {
                padding: 28px 20px;
            }
            .cta-subscribe h2 {
                font-size: 1.15rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 4px;
            }
        }
        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }
            .section-block {
                padding: 28px 0;
            }
            .page-h1 {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.15rem;
            }
            .stat-number {
                font-size: 1.4rem;
            }
            .btn-primary,
            .btn-secondary,
            .btn-green {
                padding: 10px 18px;
                font-size: .88rem;
                width: 100%;
            }
            .article-card h3 {
                font-size: .95rem;
            }
            .breadcrumb {
                font-size: .75rem;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
            --shadow-nav: 0 2px 16px rgba(37,99,235,0.08);
            --transition: all .25s cubic-bezier(.4,0,.2,1);
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        
        img {
            max-width: 100%;
            display: block;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }
        
        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        
        /* Navigation */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }
        
        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226,232,240,0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }
        
        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }
        
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }
        
        .nav-links::-webkit-scrollbar {
            display: none;
        }
        
        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }
        
        .nav-link:hover {
            background: rgba(37,99,235,0.08);
            color: var(--primary);
        }
        
        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }
        
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }
        
        .nav-toggle:hover {
            background: rgba(37,99,235,0.08);
            color: var(--primary);
        }
        
        /* Section base */
        .section-block {
            padding: 56px 0;
        }
        
        .section-block.alt-bg {
            background: #fff;
        }
        
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }
        
        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }
        
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }
        
        .badge-tag.green {
            background: rgba(22,163,74,0.10);
            color: var(--accent);
        }
        
        .badge-tag.dark {
            background: rgba(15,23,42,0.07);
            color: var(--ink-body);
        }
        
        .badge-tag.orange {
            background: rgba(245,158,11,0.12);
            color: #d97706;
        }
        
        /* Cards */
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226,232,240,0.6);
        }
        
        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37,99,235,0.2);
        }
        
        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37,99,235,0.25);
            transform: translateY(-1px);
        }
        
        .btn-primary:active {
            transform: translateY(0);
        }
        
        .btn-primary:focus-visible {
            outline: 3px solid rgba(37,99,235,0.4);
            outline-offset: 2px;
        }
        
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        
        .btn-secondary:hover {
            background: rgba(37,99,235,0.06);
            box-shadow: 0 4px 12px rgba(37,99,235,0.10);
        }
        
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37,99,235,0.4);
            outline-offset: 2px;
        }
        
        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        
        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22,163,74,0.25);
            transform: translateY(-1px);
        }
        
        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: .85rem;
            color: var(--ink-muted);
            margin-bottom: 12px;
            flex-wrap: wrap;
        }
        
        .breadcrumb a {
            color: var(--ink-muted);
            transition: var(--transition);
        }
        
        .breadcrumb a:hover {
            color: var(--primary);
        }
        
        .breadcrumb .separator {
            color: var(--ink-faint);
            user-select: none;
        }
        
        .breadcrumb .current {
            color: var(--ink-body);
            font-weight: 500;
        }
        
        /* Article card */
        .article-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226,232,240,0.6);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37,99,235,0.2);
        }
        
        .article-card-image {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: #e2e8f0;
        }
        
        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        
        .article-card:hover .article-card-image img {
            transform: scale(1.04);
        }
        
        .article-card-body {
            padding: 20px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        
        .article-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.4;
            margin-bottom: 8px;
        }
        
        .article-card-summary {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }
        
        .article-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: .78rem;
            color: var(--ink-faint);
            padding-top: 12px;
            border-top: 1px solid var(--border);
        }
        
        .article-tag {
            display: inline-flex;
            padding: 3px 10px;
            border-radius: 999px;
            font-size: .72rem;
            font-weight: 600;
            background: rgba(37,99,235,0.06);
            color: var(--primary);
        }
        
        .article-tag.green {
            background: rgba(22,163,74,0.08);
            color: var(--accent);
        }
        
        .article-tag.dark {
            background: rgba(15,23,42,0.06);
            color: var(--ink-body);
        }
        
        .article-tag.orange {
            background: rgba(245,158,11,0.1);
            color: #d97706;
        }
        
        /* Data stat */
        .stat-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 24px;
            border: 1px solid rgba(226,232,240,0.6);
            transition: var(--transition);
            text-align: center;
        }
        
        .stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        
        .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: .02em;
        }
        
        .stat-label {
            font-size: .85rem;
            color: var(--ink-muted);
            margin-top: 4px;
        }
        
        /* Select card */
        .select-card {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            border: 1px solid rgba(226,232,240,0.6);
            transition: var(--transition);
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        
        .select-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: rgba(37,99,235,0.2);
        }
        
        .select-card-index {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: .9rem;
            flex-shrink: 0;
        }
        
        .select-card-content h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 6px;
        }
        
        .select-card-content p {
            font-size: .88rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }
        
        /* Category entry */
        .category-entry-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 20px;
            border: 1px solid rgba(226,232,240,0.6);
            transition: var(--transition);
            text-align: center;
            display: block;
        }
        
        .category-entry-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37,99,235,0.2);
        }
        
        .category-entry-card h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 6px;
        }
        
        .category-entry-card p {
            font-size: .82rem;
            color: var(--ink-muted);
            line-height: 1.6;
        }
        
        /* Footer */
        .site-footer {
            background: #1e293b;
            color: #e2e8f0;
            padding: 48px 0 28px;
            margin-top: 40px;
        }
        
        .footer-brand {
            font-size: 1.25rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        
        .footer-desc {
            font-size: .88rem;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 280px;
        }
        
        .footer-heading {
            font-size: .9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: .02em;
        }
        
        .footer-link {
            display: block;
            font-size: .85rem;
            color: #cbd5e1;
            padding: 5px 0;
            transition: var(--transition);
        }
        
        .footer-link:hover {
            color: #fff;
            transform: translateX(3px);
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 32px;
            padding-top: 20px;
            font-size: .8rem;
            color: #94a3b8;
            text-align: center;
        }
        
        .footer-bottom a {
            color: #cbd5e1;
            transition: var(--transition);
        }
        
        .footer-bottom a:hover {
            color: #fff;
        }
        
        /* CTA section */
        .cta-section {
            background: linear-gradient(135deg, #1e40af 0%, #2563EB 50%, #1d4ed8 100%);
            border-radius: 16px;
            padding: 44px 36px;
            position: relative;
            overflow: hidden;
        }
        
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255,255,255,0.05);
        }
        
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40%;
            left: -10%;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(22,163,74,0.15);
        }
        
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
        }
        
        .cta-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        
        .cta-section p {
            font-size: .95rem;
            color: #dbeafe;
            line-height: 1.7;
            margin-bottom: 22px;
            max-width: 560px;
        }
        
        /* Radar description */
        .radar-desc-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
        }
        
        .radar-desc-item:last-child {
            border-bottom: none;
        }
        
        .radar-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            flex-shrink: 0;
            margin-top: 6px;
        }
        
        .radar-dot.blue {
            background: var(--primary);
        }
        
        .radar-dot.green {
            background: var(--accent);
        }
        
        .radar-dot.orange {
            background: #f59e0b;
        }
        
        .radar-dot.purple {
            background: #8b5cf6;
        }
        
        /* Responsive */
        @media (max-width: 1024px) {
            .section-block {
                padding: 44px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }
        
        @media (max-width: 768px) {
            .container-main {
                padding: 0 16px;
            }
            .section-block {
                padding: 36px 0;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                border-radius: 16px;
                box-shadow: var(--shadow-card-hover);
                padding: 12px;
                flex-direction: column;
                gap: 2px;
                margin-top: 8px;
                border: 1px solid var(--border);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-link {
                padding: 10px 16px;
                border-radius: 10px;
                width: 100%;
                text-align: left;
            }
            .nav-toggle {
                display: block;
            }
            .site-header {
                position: sticky;
                top: 8px;
                padding: 0 8px;
            }
            .nav-shell {
                padding: 6px 14px;
                border-radius: 20px;
                flex-wrap: wrap;
            }
            .cta-section {
                padding: 32px 24px;
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .article-card-title {
                font-size: .95rem;
            }
            .select-card {
                flex-direction: column;
                gap: 12px;
            }
        }
        
        @media (max-width: 520px) {
            .section-block {
                padding: 28px 0;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .section-subtitle {
                font-size: .9rem;
            }
            .container-main {
                padding: 0 12px;
            }
            .article-card-body {
                padding: 16px;
            }
            .cta-section {
                padding: 24px 18px;
                border-radius: 12px;
            }
            .stat-card {
                padding: 16px;
            }
            .badge-tag {
                font-size: .7rem;
                padding: 3px 10px;
            }
            .select-card {
                padding: 18px;
            }
            .category-entry-card {
                padding: 18px 14px;
            }
        }

/* roulang page: category6 */
:root {
            --primary: #2563EB;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #16A34A;
            --accent-light: #22c55e;
            --surface: #F8FAFC;
            --card-bg: #FFFFFF;
            --ink-dark: #0f172a;
            --ink-body: #334155;
            --ink-muted: #64748b;
            --ink-faint: #94a3b8;
            --border: #e2e8f0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-nav: 0 2px 16px rgba(37, 99, 235, 0.08);
            --transition: all .25s cubic-bezier(.4, 0, .2, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            background: var(--surface);
            color: var(--ink-dark);
            line-height: 1.75;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 50;
            padding: 0 16px;
        }

        .nav-shell {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 999px;
            box-shadow: var(--shadow-nav);
            padding: 8px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
        }

        .brand-logo {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: .02em;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
        }

        .nav-links::-webkit-scrollbar {
            display: none;
        }

        .nav-link {
            padding: 8px 14px;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            color: var(--ink-body);
            white-space: nowrap;
            transition: var(--transition);
        }

        .nav-link:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        .nav-link.active {
            background: var(--primary);
            color: #fff;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            color: var(--ink-body);
        }

        .nav-toggle:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }

        /* Section base */
        .section-block {
            padding: 56px 0;
        }

        .section-block.alt-bg {
            background: #fff;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.3;
            margin-bottom: 8px;
            letter-spacing: .01em;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--ink-muted);
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: .78rem;
            font-weight: 600;
            letter-spacing: .04em;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
        }

        .badge-tag.green {
            background: rgba(22, 163, 74, 0.10);
            color: var(--accent);
        }

        .badge-tag.dark {
            background: rgba(15, 23, 42, 0.07);
            color: var(--ink-body);
        }

        /* Cards */
        .card-base {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
        }

        .card-base:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--primary);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.10);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .btn-green {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: .95rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-green:hover {
            background: #15803d;
            box-shadow: 0 6px 16px rgba(22, 163, 74, 0.25);
            transform: translateY(-1px);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: .88rem;
            color: var(--ink-muted);
            padding: 16px 0 8px;
        }

        .breadcrumb a {
            color: var(--primary);
            font-weight: 500;
        }

        .breadcrumb a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .breadcrumb .sep {
            color: var(--ink-faint);
        }

        /* Article cards */
        .article-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.6);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .article-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border);
        }

        .article-card .card-body {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: .78rem;
            color: var(--ink-faint);
            margin-top: auto;
            padding-top: 12px;
        }

        .article-card .card-title {
            font-size: 1.08rem;
            font-weight: 700;
            color: var(--ink-dark);
            line-height: 1.45;
            margin-bottom: 8px;
        }

        .article-card .card-title a:hover {
            color: var(--primary);
        }

        .article-card .card-excerpt {
            font-size: .9rem;
            color: var(--ink-muted);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* Data stat cards */
        .stat-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 24px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: .02em;
        }

        .stat-label {
            font-size: .88rem;
            color: var(--ink-muted);
            margin-top: 4px;
        }

        /* Term cards */
        .term-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 22px 24px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
        }

        .term-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .term-card .term-title {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--ink-dark);
            margin-bottom: 6px;
        }

        .term-card .term-desc {
            font-size: .9rem;
            color: var(--ink-muted);
            line-height: 1.7;
        }

        /* CTA banner */
        .cta-banner {
            background: linear-gradient(135deg, #1e40af 0%, #2563EB 50%, #1d4ed8 100%);
            border-radius: 16px;
            padding: 48px 40px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-banner::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-banner h2 {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }

        .cta-banner p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }

        .cta-banner .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            font-size: 1rem;
            border-radius: 999px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            z-index: 1;
        }

        .cta-banner .btn-cta:hover {
            background: #f0f4ff;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 32px;
            margin-top: 48px;
        }

        .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-desc {
            font-size: .88rem;
            color: var(--ink-faint);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .footer-heading {
            font-size: .95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-link {
            display: block;
            font-size: .88rem;
            color: #94a3b8;
            padding: 4px 0;
            transition: var(--transition);
        }

        .footer-link:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            margin-top: 32px;
            font-size: .82rem;
            color: var(--ink-faint);
            text-align: center;
        }

        .footer-bottom a {
            color: #64748b;
            transition: var(--transition);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* Editor picks */
        .editor-pick {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .editor-pick:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.2);
        }

        .editor-pick .pick-img {
            height: 180px;
            object-fit: cover;
        }

        .editor-pick .pick-body {
            padding: 18px 20px;
            flex: 1;
        }

        .editor-pick .pick-title {
            font-weight: 700;
            font-size: 1rem;
            color: var(--ink-dark);
            line-height: 1.45;
            margin-bottom: 6px;
        }

        .editor-pick .pick-desc {
            font-size: .85rem;
            color: var(--ink-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .section-block {
                padding: 44px 0;
            }
            .container-main {
                padding: 0 20px;
            }
        }

        @media (max-width: 768px) {
            .section-block {
                padding: 36px 0;
            }
            .container-main {
                padding: 0 16px;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .cta-banner {
                padding: 32px 24px;
            }
            .cta-banner h2 {
                font-size: 1.4rem;
            }
            .article-card .card-img {
                height: 160px;
            }
        }

        @media (max-width: 640px) {
            .nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                border-radius: 16px;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
                padding: 12px;
                margin-top: 8px;
                border: 1px solid var(--border);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                justify-content: flex-start;
                padding: 10px 14px;
            }
            .article-card .card-img {
                height: 180px;
            }
            .section-block {
                padding: 28px 0;
            }
            .cta-banner {
                padding: 24px 18px;
                border-radius: 12px;
            }
        }