/* roulang page: index */
:root {
            --brand: #2848e8;
            --brand-dark: #1f36cf;
            --brand-light: #eef4ff;
            --accent: #f59e0b;
            --bg: #ffffff;
            --surface: #f7f9fc;
            --ink: #1a2233;
            --soft: #5b6478;
            --line: #e3e8f0;
            --radius: 1rem;
            --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
            --shadow-lift: 0 4px 12px rgba(16, 24, 40, .08), 0 16px 32px rgba(16, 24, 40, .12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            background-color: #fff;
            color: var(--ink);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container-site {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 640px) {
            .container-site {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

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

        .nav-link {
            position: relative;
            padding: .5rem .875rem;
            border-radius: .5rem;
            font-weight: 500;
            font-size: .9375rem;
            color: #4b5563;
            transition: color .2s ease, background-color .2s ease;
        }

        .nav-link:hover {
            color: var(--brand);
            background-color: var(--brand-light);
        }

        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: .125rem;
            left: 50%;
            transform: translateX(-50%);
            width: 1.25rem;
            height: 2px;
            border-radius: 2px;
            background-color: var(--brand);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background-color: var(--brand);
            color: #fff;
            padding: .75rem 1.5rem;
            border-radius: .75rem;
            font-weight: 600;
            font-size: .9375rem;
            transition: background-color .2s, box-shadow .2s, transform .2s;
            box-shadow: 0 2px 8px rgba(40, 72, 232, .2);
        }

        .btn-primary:hover {
            background-color: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(40, 72, 232, .28);
        }

        .btn-primary:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(61, 107, 246, .2);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background-color: #fff;
            color: var(--ink);
            border: 1px solid var(--line);
            padding: .75rem 1.5rem;
            border-radius: .75rem;
            font-weight: 600;
            font-size: .9375rem;
            transition: border-color .2s, box-shadow .2s, transform .2s, color .2s;
        }

        .btn-secondary:hover {
            border-color: var(--brand);
            color: var(--brand);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(16, 24, 40, .08);
        }

        .btn-secondary:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(61, 107, 246, .16);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background-color: var(--accent);
            color: #1a2233;
            padding: .75rem 1.5rem;
            border-radius: .75rem;
            font-weight: 700;
            font-size: .9375rem;
            transition: background-color .2s, box-shadow .2s, transform .2s;
            box-shadow: 0 2px 8px rgba(245, 158, 11, .25);
        }

        .btn-accent:hover {
            background-color: #f59e0bcc;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, .32);
        }

        .btn-accent:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(245, 158, 11, .22);
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: rgba(255, 255, 255, .15);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, .25);
            color: #fff;
            padding: .375rem 1rem;
            border-radius: 999px;
            font-size: .875rem;
            font-weight: 500;
        }

        .hero-badge .dot {
            width: .5rem;
            height: .5rem;
            border-radius: 999px;
            background-color: #34d399;
            box-shadow: 0 0 0 4px rgba(52, 211, 153, .2);
        }

        .section-title {
            font-size: clamp(1.75rem, 3vw, 2.25rem);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.02em;
            color: var(--ink);
        }

        .section-subtitle {
            font-size: 1.0625rem;
            line-height: 1.7;
            color: var(--soft);
            max-width: 560px;
        }

        .card-base {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--line);
            transition: box-shadow .25s, transform .25s, border-color .25s;
        }

        .card-base:hover {
            box-shadow: var(--shadow-lift);
            transform: translateY(-4px);
            border-color: #cdd7e6;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: .25rem;
            padding: .25rem .625rem;
            border-radius: 999px;
            font-size: .75rem;
            font-weight: 600;
            line-height: 1.4;
        }

        .badge-brand {
            background-color: var(--brand-light);
            color: var(--brand);
        }

        .badge-accent {
            background-color: #fef3c7;
            color: #b45309;
        }

        .badge-green {
            background-color: #d1fae5;
            color: #065f46;
        }

        .badge-gray {
            background-color: #f3f4f6;
            color: #4b5563;
        }

        .stat-card {
            background: rgba(255, 255, 255, .95);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, .6);
            border-radius: 1.25rem;
            padding: 1.5rem;
            text-align: center;
            box-shadow: 0 8px 32px rgba(0, 0, 0, .12);
        }

        .stat-card .number {
            font-size: 2.25rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.1;
        }

        .stat-card .label {
            font-size: .875rem;
            color: rgba(255, 255, 255, .85);
            margin-top: .375rem;
            font-weight: 500;
        }

        .stat-card-main {
            background: rgba(255, 255, 255, .95);
            border: 1px solid var(--line);
            border-radius: 1rem;
            padding: 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
        }

        .stat-card-main .number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--brand);
            line-height: 1.1;
        }

        .stat-card-main .label {
            font-size: .875rem;
            color: var(--soft);
            margin-top: .375rem;
            font-weight: 500;
        }

        .faq-item {
            border: 1px solid var(--line);
            border-radius: 1rem;
            background: #fff;
            overflow: hidden;
            transition: border-color .2s, box-shadow .2s;
        }

        .faq-item:hover {
            border-color: #cdd7e6;
            box-shadow: var(--shadow);
        }

        .faq-item summary {
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::after {
            content: "\f078";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: .875rem;
            color: var(--soft);
            transition: transform .25s;
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }

        .faq-item .faq-body {
            padding: 0 1.5rem 1.5rem;
            color: var(--soft);
            font-size: .9375rem;
            line-height: 1.75;
        }

        .footer-link {
            color: #9ca3af;
            transition: color .2s;
            font-size: .875rem;
        }

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

        .form-input {
            width: 100%;
            padding: .75rem 1rem;
            border-radius: .75rem;
            border: 1px solid var(--line);
            background: #fff;
            font-size: .9375rem;
            color: var(--ink);
            transition: border-color .2s, box-shadow .2s;
        }

        .form-input::placeholder {
            color: #9ca3af;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--brand);
            box-shadow: 0 0 0 4px rgba(61, 107, 246, .12);
        }

        .section-padding {
            padding-top: 4rem;
            padding-bottom: 4rem;
        }

        @media (min-width: 768px) {
            .section-padding {
                padding-top: 5.5rem;
                padding-bottom: 5.5rem;
            }
        }

        .divider {
            height: 1px;
            background: linear-gradient(to right, transparent, var(--line), transparent);
            border: none;
            margin: 0;
        }

        .hero-gradient {
            background: linear-gradient(135deg, #1e2b5f 0%, #2848e8 55%, #4f7cf7 100%);
        }

        .step-line {
            position: relative;
        }

        .step-line::before {
            content: "";
            position: absolute;
            top: 2.5rem;
            left: 2.5rem;
            right: 2.5rem;
            height: 2px;
            background: linear-gradient(to right, var(--brand), var(--accent));
            opacity: .2;
            border-radius: 2px;
        }

        @media (max-width: 768px) {
            .step-line::before {
                display: none;
            }
        }

        .timeline-dot {
            width: .875rem;
            height: .875rem;
            border-radius: 999px;
            background: var(--brand);
            border: 3px solid #fff;
            box-shadow: 0 0 0 2px var(--brand);
            position: absolute;
            left: 0;
            top: .375rem;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 4rem;
            left: 1rem;
            right: 1rem;
            background: #fff;
            border-radius: 1rem;
            box-shadow: var(--shadow-lift);
            border: 1px solid var(--line);
            padding: 1rem;
            z-index: 40;
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu .nav-link {
            display: block;
            padding: .75rem 1rem;
            border-radius: .75rem;
            font-size: 1rem;
        }

        .mobile-menu .nav-link.active {
            background-color: var(--brand-light);
        }

        .mobile-menu .nav-link.active::after {
            display: none;
        }

        .transition-base {
            transition: all .25s ease;
        }

        .hover-lift:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lift);
        }

        .focus-ring:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(61, 107, 246, .2);
        }

        @media (max-width: 1024px) {
            .desktop-nav-links {
                display: none;
            }
            .mobile-menu-btn {
                display: inline-flex !important;
            }
        }

        @media (min-width: 1025px) {
            .mobile-menu-btn {
                display: none !important;
            }
        }

/* roulang page: category1 */
:root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-500: #3b82f6;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --brand-950: #172554;
            --accent-400: #f59e0b;
            --ink: #0f172a;
            --soft: #64748b;
            --line: #e2e8f0;
            --bg: #f8fafc;
            --card: #ffffff;
            --radius: 1rem;
            --shadow: 0 10px 30px rgba(2, 12, 27, .07);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

        button,
        input {
            font-family: inherit;
        }

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        .nav-link {
            font-size: .875rem;
            font-weight: 500;
            color: var(--soft);
            padding: .375rem .875rem;
            border-radius: .75rem;
            transition: all .2s;
            display: inline-flex;
            align-items: center;
            gap: .25rem;
        }

        .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .nav-link.active {
            color: var(--brand-700);
            background: linear-gradient(135deg, #eff6ff, #dbeafe);
            font-weight: 600;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            background: linear-gradient(135deg, var(--brand-600), var(--brand-700));
            color: #fff;
            font-weight: 600;
            padding: .625rem 1.25rem;
            border-radius: .875rem;
            transition: all .2s;
            box-shadow: 0 4px 14px rgba(37, 99, 235, .28);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, .35);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(37, 99, 235, .25);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            border: 1.5px solid var(--line);
            background: #fff;
            color: var(--ink);
            font-weight: 500;
            padding: .625rem 1.25rem;
            border-radius: .875rem;
            transition: all .2s;
            cursor: pointer;
        }

        .btn-outline:hover {
            border-color: var(--brand-500);
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .form-input {
            width: 100%;
            border-radius: .75rem;
            border: 1.5px solid var(--line);
            padding: .5rem 1rem;
            font-size: .875rem;
            transition: all .2s;
            background: #fff;
            color: var(--ink);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--brand-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, .12);
        }

        .form-input::placeholder {
            color: #94a3b8;
        }

        .focus-ring:focus {
            outline: 2px solid var(--brand-500);
            outline-offset: 2px;
        }

        .card {
            background: var(--card);
            border-radius: var(--radius);
            border: 1px solid var(--line);
            /* box-shadow: var(--shadow); */
            transition: all .25s;
            overflow: hidden;
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px rgba(2, 12, 27, .10);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: .25rem;
            background: var(--brand-50);
            color: var(--brand-700);
            font-size: .75rem;
            font-weight: 600;
            padding: .25rem .625rem;
            border-radius: 9999px;
            line-height: 1.4;
        }

        .footer-link {
            color: #94a3b8;
            transition: all .2s;
            font-size: .875rem;
            display: inline-flex;
            align-items: center;
            gap: .375rem;
        }

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

        .mobile-nav-panel {
            display: none;
        }

        .mobile-nav-panel.open {
            display: block;
        }

        @media (min-width: 1024px) {
            .mobile-nav-panel {
                display: none !important;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav-links {
                display: none;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu-btn {
                display: none;
            }
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
        }

        .faq-icon {
            transition: transform .3s ease;
            flex-shrink: 0;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--brand-600);
        }

        .data-table {
            width: 100%;
            border-collapse: collapse;
        }

        .data-table th {
            text-align: left;
            padding: .875rem 1rem;
            font-size: .75rem;
            text-transform: uppercase;
            letter-spacing: .05em;
            color: var(--soft);
            background: #f8fafc;
            border-bottom: 2px solid var(--line);
            font-weight: 600;
        }

        .data-table td {
            padding: .875rem 1rem;
            font-size: .875rem;
            border-bottom: 1px solid var(--line);
            color: #334155;
        }

        .data-table tr:last-child td {
            border-bottom: none;
        }

        .data-table tbody tr {
            transition: background .15s;
        }

        .data-table tbody tr:hover {
            background: #f8fafc;
        }

        .timeline {
            position: relative;
            padding-left: 1.75rem;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: .4375rem;
            top: .25rem;
            bottom: .25rem;
            width: 2px;
            background: var(--line);
            border-radius: 9999px;
        }

        .timeline-item {
            position: relative;
            padding-bottom: 1.5rem;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -1.4375rem;
            top: .3125rem;
            width: .75rem;
            height: .75rem;
            border-radius: 9999px;
            background: var(--brand-500);
            border: 2px solid #fff;
            box-shadow: 0 0 0 3px var(--brand-100);
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(16px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-up {
            animation: fadeUp .5s ease both;
        }

/* roulang page: article */
:root {
            --brand: #0ea5e9;
            --brand-dark: #0369a1;
            --brand-light: #38bdf8;
            --accent: #fbbf24;
            --ink: #0f172a;
            --soft: #64748b;
            --line: #e2e8f0;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: #0f172a;
            background-color: #ffffff;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        .container-site {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
            color: #ffffff;
            font-weight: 600;
            font-size: 0.9375rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.75rem;
            border: none;
            transition: all 0.2s ease;
            box-shadow: 0 2px 8px rgba(2, 132, 199, 0.2);
        }

        .btn-primary:hover {
            box-shadow: 0 10px 24px rgba(2, 132, 199, 0.3);
            transform: translateY(-2px);
            color: #ffffff;
        }

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

        .btn-primary:focus-visible {
            outline: 3px solid rgba(56, 189, 248, 0.4);
            outline-offset: 2px;
        }

        .form-input {
            background: #f1f5f9;
            border: 1px solid #e2e8f0;
            border-radius: 0.75rem;
            padding: 0.625rem 1rem;
            font-size: 0.9375rem;
            color: #0f172a;
            transition: all 0.2s;
            width: 100%;
        }

        .form-input::placeholder {
            color: #94a3b8;
        }

        .form-input:focus {
            outline: none;
            border-color: #0ea5e9;
            background: #ffffff;
            box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.875rem;
            border-radius: 0.625rem;
            font-size: 0.9375rem;
            font-weight: 500;
            color: #0f172a;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            background: #f1f5f9;
            color: #0ea5e9;
        }

        .nav-link.active {
            color: #0ea5e9;
            background: rgba(14, 165, 233, 0.08);
            font-weight: 600;
        }

        .nav-link:focus-visible {
            outline: 3px solid rgba(56, 189, 248, 0.4);
            outline-offset: 2px;
        }

        .mobile-nav-link {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1rem;
            border-radius: 0.75rem;
            font-weight: 500;
            color: #0f172a;
            transition: all 0.2s;
            font-size: 0.9375rem;
        }

        .mobile-nav-link:hover {
            background: #f1f5f9;
            color: #0ea5e9;
        }

        .mobile-nav-link.active {
            color: #0ea5e9;
            background: rgba(14, 165, 233, 0.08);
            font-weight: 600;
        }

        .footer-link {
            color: #94a3b8;
            font-size: 0.9375rem;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
        }

        .footer-link:hover {
            color: #ffffff;
            padding-left: 0.375rem;
        }

        .focus-ring:focus-visible {
            outline: 3px solid rgba(56, 189, 248, 0.4);
            outline-offset: 2px;
            border-radius: 0.5rem;
        }

        .card-hover {
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }

        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
            border-color: #bae6fd;
        }

        .card-hover:focus-visible {
            outline: 3px solid rgba(56, 189, 248, 0.4);
            outline-offset: 2px;
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.375rem;
            height: 2.375rem;
            border-radius: 0.75rem;
            background: #f1f5f9;
            color: #64748b;
            font-size: 0.9375rem;
            transition: all 0.2s;
        }

        .share-btn:hover {
            background: #e0f2fe;
            color: #0ea5e9;
            transform: translateY(-2px);
        }

        .share-btn:focus-visible {
            outline: 3px solid rgba(56, 189, 248, 0.4);
            outline-offset: 2px;
        }

        .article-content {
            font-size: 1.0625rem;
            line-height: 1.9;
            color: #334155;
        }

        .article-content h1,
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            color: #0f172a;
            font-weight: 700;
            line-height: 1.4;
            margin-top: 2.25rem;
            margin-bottom: 1rem;
        }

        .article-content h2 {
            font-size: 1.625rem;
            padding-bottom: 0.625rem;
            border-bottom: 2px solid #e2e8f0;
        }

        .article-content h3 {
            font-size: 1.375rem;
        }

        .article-content h4 {
            font-size: 1.125rem;
        }

        .article-content p {
            margin-bottom: 1.25rem;
        }

        .article-content img {
            border-radius: 1rem;
            margin: 1.75rem auto;
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
        }

        .article-content ul,
        .article-content ol {
            margin: 1rem 0 1.5rem;
            padding-left: 1.75rem;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

        .article-content li {
            margin-bottom: 0.625rem;
            padding-left: 0.375rem;
        }

        .article-content blockquote {
            border-left: 4px solid #0ea5e9;
            padding: 1.125rem 1.375rem;
            background: #f0f9ff;
            border-radius: 0 1rem 1rem 0;
            margin: 1.75rem 0;
            color: #475569;
        }

        .article-content a {
            color: #0ea5e9;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content a:hover {
            color: #0369a1;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.9375rem;
        }

        .article-content th {
            background: #f8fafc;
            font-weight: 600;
            text-align: left;
            padding: 0.75rem 1rem;
            border: 1px solid #e2e8f0;
        }

        .article-content td {
            padding: 0.75rem 1rem;
            border: 1px solid #e2e8f0;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-0.5rem);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .mobile-menu:not(.hidden) {
            animation: slideDown 0.25s ease;
        }

        .line-clamp-1 {
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        @media (max-width: 640px) {
            .container-site {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

/* roulang page: category3 */
:root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-200: #bfdbfe;
            --brand-300: #93c5fd;
            --brand-400: #60a5fa;
            --brand-500: #3b82f6;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --brand-800: #1e40af;
            --brand-900: #1e3a8a;
            --brand-950: #172554;
            --accent-400: #fbbf24;
            --accent-500: #f59e0b;
            --ink: #0f172a;
            --soft: #64748b;
            --line: #e2e8f0;
            --bg-light: #f8fafc;
            --radius: 1rem;
            --radius-lg: 1.5rem;
            --shadow-card: 0 4px 20px rgba(15, 23, 42, .06);
            --shadow-hover: 0 12px 32px rgba(15, 23, 42, .12);
            --transition: .25s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'system-ui', sans-serif;
            line-height: 1.6;
            color: var(--ink);
            background: #fff;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            font-family: inherit;
            border: none;
            cursor: pointer;
            background: none;
        }

        input,
        textarea {
            font-family: inherit;
        }

        .container-site {
            max-width: 1280px;
            margin-inline: auto;
            padding-inline: 1.5rem;
        }

        @media (max-width: 640px) {
            .container-site {
                padding-inline: 1rem;
            }
        }

        .focus-ring:focus-visible {
            outline: 2px solid var(--brand-500);
            outline-offset: 2px;
        }

        .desktop-nav-links {
            display: flex;
            align-items: center;
            gap: .125rem;
        }

        @media (max-width: 767.98px) {
            .desktop-nav-links {
                display: none !important;
            }
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: .625rem 1rem;
            border-radius: .75rem;
            font-size: .925rem;
            font-weight: 500;
            color: var(--ink);
            transition: color .2s, background .2s;
        }

        .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .nav-link.active {
            color: var(--brand-600);
            font-weight: 600;
            background: var(--brand-50);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 4px;
            width: 20px;
            height: 3px;
            border-radius: 9999px;
            background: var(--brand-500);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            padding: .75rem 1.5rem;
            border-radius: 9999px;
            background: linear-gradient(135deg, #2563eb, #1e40af);
            color: #fff;
            font-weight: 600;
            font-size: .925rem;
            box-shadow: 0 4px 16px rgba(37, 99, 235, .25);
            transition: all .25s ease;
            border: none;
            cursor: pointer;
            line-height: 1.4;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, .35);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(37, 99, 235, .25);
        }

        .btn-primary:focus-visible {
            outline: 2px solid var(--brand-600);
            outline-offset: 2px;
        }

        .form-input {
            width: 100%;
            padding: .75rem 1.25rem;
            border-radius: .75rem;
            border: 1px solid var(--line);
            background: #fff;
            color: var(--ink);
            font-size: .925rem;
            transition: border-color .2s, box-shadow .2s;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--brand-400);
            box-shadow: 0 0 0 4px rgba(59, 130, 246, .12);
        }

        .form-input::placeholder {
            color: #94a3b8;
        }

        .mobile-menu-btn {
            transition: background .2s, color .2s;
        }

        .mobile-menu-btn:hover {
            background: #f1f5f9;
            color: var(--brand-600);
        }

        .mobile-menu {
            display: none;
        }

        .mobile-menu.open {
            display: block;
        }

        @media (min-width: 768px) {
            .mobile-menu {
                display: none !important;
            }
        }

        .mobile-nav-link {
            display: block;
            padding: .875rem 1rem;
            border-radius: .75rem;
            font-weight: 500;
            color: var(--ink);
            transition: background .2s, color .2s;
        }

        .mobile-nav-link:hover {
            background: var(--brand-50);
            color: var(--brand-600);
        }

        .mobile-nav-link.active {
            background: var(--brand-50);
            color: var(--brand-600);
            font-weight: 600;
        }

        .section-pad {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }

        @media (max-width: 640px) {
            .section-pad {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }

        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 1.5rem;
            margin-bottom: 2.5rem;
        }

        .section-head.left {
            align-items: flex-start;
            flex-direction: column;
        }

        .section-eyebrow {
            display: inline-block;
            font-size: .75rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: var(--brand-500);
            margin-bottom: .5rem;
        }

        .section-head h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin: 0;
        }

        .section-head p {
            color: var(--soft);
            margin-top: .5rem;
            margin-bottom: 0;
            font-size: .95rem;
        }

        @media (max-width: 640px) {
            .section-head {
                flex-direction: column;
                align-items: flex-start;
            }
            .section-head h2 {
                font-size: 1.5rem;
            }
        }

        .text-button {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            font-weight: 600;
            font-size: .875rem;
            color: var(--brand-600);
            padding: .5rem 1rem;
            border-radius: 9999px;
            transition: background .2s, transform .2s;
            white-space: nowrap;
        }

        .text-button:hover {
            background: var(--brand-50);
            transform: translateX(2px);
        }

        .card-hover {
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }

        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--brand-200);
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            padding: .625rem 1.25rem;
            border-radius: 9999px;
            background: #fff;
            border: 1px solid var(--line);
            font-size: .875rem;
            font-weight: 500;
            color: var(--ink);
            transition: all .25s ease;
        }

        .tag-chip:hover {
            border-color: var(--brand-300);
            color: var(--brand-600);
            background: var(--brand-50);
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
        }

        .tag-light {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            padding: .375rem .875rem;
            border-radius: 9999px;
            background: rgba(255, 255, 255, .15);
            border: 1px solid rgba(255, 255, 255, .25);
            color: #fff;
            font-size: .75rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }

        .footer-link {
            color: #94a3b8;
            font-size: .9rem;
            transition: color .2s;
            display: inline-flex;
            align-items: center;
            gap: .375rem;
        }

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

        .footer-link::before {
            content: '';
            width: 6px;
            height: 6px;
            border-radius: 9999px;
            background: var(--brand-400);
            opacity: .6;
            flex-shrink: 0;
        }

        .faq-item {
            border: 1px solid var(--line);
            border-radius: 1rem;
            background: #fff;
            overflow: hidden;
            transition: box-shadow .3s ease, border-color .3s ease;
        }

        .faq-item.open {
            box-shadow: var(--shadow-card);
            border-color: var(--brand-200);
        }

        .faq-toggle {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--ink);
            text-align: left;
            transition: color .2s;
        }

        .faq-toggle:hover {
            color: var(--brand-600);
        }

        .faq-panel {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-panel p {
            padding: 0 1.5rem 1.25rem;
            color: var(--soft);
            font-size: .925rem;
            line-height: 1.75;
        }

        .rank-item {
            transition: background .25s ease, border-color .25s ease, transform .25s ease;
        }

        .rank-item:hover {
            background: rgba(255, 255, 255, .1);
            border-color: rgba(255, 255, 255, .2);
            transform: translateX(4px);
        }

/* roulang page: category2 */
:root {
            --brand-50: #eef4ff;
            --brand-100: #dbe6ff;
            --brand-200: #c0d2ff;
            --brand-300: #94b3ff;
            --brand-400: #6189ff;
            --brand-500: #3b5ef6;
            --brand-600: #1e3ee0;
            --brand-700: #1b33bd;
            --brand-800: #1b2e96;
            --brand-900: #1a2b77;
            --brand-950: #111a4d;
            --accent-300: #fcd34d;
            --accent-400: #fbbf24;
            --accent-500: #f59e0b;
            --ink: #0f172a;
            --soft: #64748b;
            --line: #e2e8f0;
            --radius: 1rem;
            --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 14px 32px rgba(15, 23, 42, 0.12);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
            color: #0f172a;
            background: #f8fafc;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        input,
        textarea {
            font-family: inherit;
        }

        h1,
        h2,
        h3,
        h4 {
            line-height: 1.3;
        }

        section[id],
        div[id] {
            scroll-margin-top: 5.5rem;
        }

        .container-site {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container-site {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.9rem;
            border-radius: 0.75rem;
            font-size: 0.9375rem;
            font-weight: 500;
            color: #64748b;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: #1e3ee0;
            background: #eef4ff;
        }

        .nav-link.active {
            color: #1e3ee0;
            background: #eef4ff;
            font-weight: 600;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #3b5ef6, #1e3ee0);
            color: #fff;
            font-weight: 600;
            border-radius: 0.75rem;
            padding: 0.75rem 1.5rem;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(30, 62, 224, 0.25);
            border: none;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30, 62, 224, 0.35);
            color: #fff;
        }

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

        .btn-soft {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: #1e3ee0;
            font-weight: 600;
            border-radius: 0.75rem;
            padding: 0.75rem 1.5rem;
            border: 1px solid #e2e8f0;
            transition: all 0.25s ease;
        }

        .btn-soft:hover {
            border-color: #6189ff;
            background: #eef4ff;
            color: #1e3ee0;
        }

        .btn-hero-ghost {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            font-weight: 600;
            border-radius: 0.75rem;
            padding: 0.75rem 1.5rem;
            backdrop-filter: blur(4px);
            transition: all 0.25s ease;
        }

        .btn-hero-ghost:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-primary:focus-visible,
        .btn-soft:focus-visible,
        .btn-hero-ghost:focus-visible {
            outline: 2px solid #94b3ff;
            outline-offset: 3px;
        }

        .form-input {
            width: 100%;
            border-radius: 0.75rem;
            border: 1px solid #e2e8f0;
            padding: 0.625rem 2.5rem 0.625rem 1rem;
            background: #fff;
            color: #0f172a;
            font-size: 0.875rem;
            transition: all 0.2s ease;
        }

        .form-input:focus {
            outline: none;
            border-color: #6189ff;
            box-shadow: 0 0 0 4px rgba(97, 137, 255, 0.15);
        }

        .form-input::placeholder {
            color: #94a3b8;
        }

        .focus-ring:focus-visible {
            outline: 2px solid #6189ff;
            outline-offset: 2px;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.3rem 0.7rem;
            border-radius: 999px;
            line-height: 1.4;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            padding: 0.4rem 1rem;
            border-radius: 999px;
            font-size: 0.8125rem;
            font-weight: 500;
            background: #fff;
            border: 1px solid #e2e8f0;
            color: #64748b;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .chip:hover {
            border-color: #6189ff;
            color: #1e3ee0;
        }

        .chip-active {
            background: #1e3ee0;
            border-color: #1e3ee0;
            color: #fff;
        }

        .chip-active:hover {
            color: #fff;
        }

        .card {
            background: #fff;
            border-radius: 1rem;
            border: 1px solid #e2e8f0;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #c0d2ff;
        }

        .section {
            padding: 4.5rem 0;
        }

        @media (max-width: 640px) {
            .section {
                padding: 3rem 0;
            }
        }

        .section-title {
            font-size: 1.75rem;
            line-height: 1.25;
            font-weight: 700;
            color: #0f172a;
            letter-spacing: -0.02em;
        }

        @media (max-width: 640px) {
            .section-title {
                font-size: 1.45rem;
            }
        }

        .hero-banner {
            position: relative;
            overflow: hidden;
        }

        .hero-banner .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.35;
        }

        .hero-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(17, 26, 77, 0.93) 0%, rgba(30, 62, 224, 0.78) 55%, rgba(97, 137, 255, 0.4) 100%);
            z-index: 1;
        }

        .hero-banner .container-site {
            position: relative;
            z-index: 2;
        }

        .step-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: #e0e7ff;
            line-height: 1;
            letter-spacing: -0.04em;
        }

        .faq-item {
            border: 1px solid #e2e8f0;
            border-radius: 1rem;
            background: #fff;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .faq-item.open {
            border-color: #6189ff;
            box-shadow: 0 6px 24px rgba(97, 137, 255, 0.12);
        }

        .faq-toggle {
            transition: color 0.2s ease;
        }

        .faq-toggle:hover {
            color: #1e3ee0;
        }

        .footer-link {
            color: #94a3b8;
            transition: all 0.2s ease;
            font-size: 0.875rem;
        }

        .footer-link:hover {
            color: #fff;
            padding-left: 4px;
        }

        .mobile-menu {
            transition: all 0.25s ease;
        }

        @media (max-width: 767px) {
            .desktop-nav-links {
                display: none;
            }
        }