/* roulang page: index */
:root {
            --brand-900: #0b1e33;
            --brand-800: #122f4a;
            --gold-500: #f59e0b;
            --gold-600: #d97706;
            --text-main: #1e293b;
            --text-weak: #64748b;
            --bg-light: #f4f6f9;
            --border: #e2e8f0;
            --radius: 16px;
            --shadow: 0 4px 24px rgba(2, 12, 27, 0.06);
            --shadow-hover: 0 12px 32px rgba(2, 12, 27, 0.12);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', -apple-system, sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            line-height: 1.6;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        .scrollbar-none::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-none {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .card-hover {
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .line-clamp-3 {
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(245, 158, 11, 0.4);
            outline-offset: 2px;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(6, 15, 26, 0.82) 0%, rgba(11, 30, 51, 0.65) 50%, rgba(6, 15, 26, 0.75) 100%);
        }
        .btn-primary {
            transition: all .3s ease;
            background: linear-gradient(135deg, #f59e0b, #fbbf24);
            color: #0b1e33;
            font-weight: 700;
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(245, 158, 11, 0.4);
        }
        .btn-secondary {
            transition: all .3s ease;
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            backdrop-filter: blur(8px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .stat-card {
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .stat-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 16px 40px rgba(2, 12, 27, 0.12);
        }
        .faq-icon {
            transition: transform .35s ease;
        }
        details[open] .faq-icon {
            transform: rotate(45deg);
        }
        details>summary {
            list-style: none;
        }
        details>summary::-webkit-details-marker {
            display: none;
        }
        details[open] {
            box-shadow: 0 8px 30px rgba(2, 12, 27, 0.08);
            border-color: rgba(245, 158, 11, 0.3) !important;
        }
        .footer-link {
            transition: color .2s ease;
        }
        .footer-link:hover {
            color: #fbbf24;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding-left: 1.25rem;
                padding-right: 1.25rem;
            }
        }
        @media (max-width: 520px) {
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --brand-900: #1e346b;
            --brand-950: #151f45;
            --gold-500: #d99a0a;
            --page-bg: #f6f8fb;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--page-bg);
            color: #0f172a;
        }

        .scrollbar-none::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-none {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

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

        .line-clamp-3 {
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .card-lift {
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }
        .card-lift:hover {
            transform: translateY(-5px);
            box-shadow: 0 18px 40px -12px rgba(21, 31, 69, .18);
            border-color: rgba(30, 52, 107, .25);
        }

        .hero-overlay {
            background: linear-gradient(105deg, rgba(21, 31, 69, .96) 0%, rgba(30, 52, 107, .88) 45%, rgba(30, 52, 107, .35) 100%);
        }

        .footer-link {
            color: #94a3b8;
            transition: color .25s ease, padding-left .25s ease;
        }
        .footer-link:hover {
            color: #f8fafc;
        }

        .faq-item .fa-chevron-down {
            transition: transform .3s ease;
        }
        .faq-item.active .fa-chevron-down {
            transform: rotate(180deg);
        }

        .faq-answer {
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
            animation: fadeIn .3s ease;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(-6px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .stat-card {
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, .8);
            border-radius: 16px;
            padding: 24px 20px;
            text-align: center;
            transition: all .3s ease;
        }
        .stat-card:hover {
            border-color: rgba(30, 52, 107, .3);
            box-shadow: 0 12px 32px -10px rgba(21, 31, 69, .12);
            transform: translateY(-3px);
        }

        .rank-card {
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, .8);
            border-radius: 14px;
            transition: all .3s ease;
        }
        .rank-card:hover {
            border-color: rgba(217, 154, 10, .4);
            background: #fffdf6;
            transform: translateX(4px);
        }

        .top-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: rgba(21, 31, 69, .88);
            color: #ffffff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            backdrop-filter: blur(6px);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .category-chip {
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, .8);
            border-radius: 14px;
            padding: 18px 16px;
            display: flex;
            align-items: center;
            gap: 12px;
            transition: all .3s ease;
            color: #334155;
            font-weight: 500;
            font-size: 14px;
        }
        .category-chip:hover {
            border-color: rgba(30, 52, 107, .35);
            background: #f8fafc;
            color: #1e346b;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px -8px rgba(21, 31, 69, .12);
        }

        .cta-section {
            background: linear-gradient(120deg, #151f45 0%, #1e346b 55%, #2a5bd0 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 360px;
            height: 360px;
            border-radius: 999px;
            background: rgba(217, 154, 10, .18);
            filter: blur(70px);
            top: -120px;
            right: -80px;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            width: 220px;
            height: 220px;
            border-radius: 999px;
            background: rgba(255, 255, 255, .06);
            bottom: -80px;
            left: 10%;
        }

        input:focus {
            outline: none;
        }

/* roulang page: article */
html { scroll-behavior: smooth; }
body { font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif; -webkit-font-smoothing: antialiased; }
::selection { background: #c8962a; color: #0a1428; }
.scrollbar-none::-webkit-scrollbar { display: none; }
.scrollbar-none { -ms-overflow-style: none; scrollbar-width: none; }
.footer-link { transition: all .2s ease; }
.footer-link:hover { color: #d4aa3c; }
.content-body { font-size: 1.0625rem; line-height: 1.9; color: #334155; word-break: break-word; }
.content-body > *:first-child { margin-top: 0; }
.content-body h2 { font-size: 1.5rem; font-weight: 800; color: #122140; margin: 2.25rem 0 1rem; line-height: 1.4; }
.content-body h3 { font-size: 1.25rem; font-weight: 700; color: #122140; margin: 1.75rem 0 .75rem; line-height: 1.5; }
.content-body h4 { font-size: 1.125rem; font-weight: 600; color: #182b52; margin: 1.5rem 0 .5rem; }
.content-body p { margin-bottom: 1.25rem; }
.content-body img { border-radius: 1rem; margin: 1.5rem 0; box-shadow: 0 12px 35px -12px rgba(10,20,40,.18); max-width: 100%; height: auto; }
.content-body ul { list-style: disc; padding-left: 1.5rem; margin-bottom: 1.25rem; }
.content-body ol { list-style: decimal; padding-left: 1.5rem; margin-bottom: 1.25rem; }
.content-body li { margin-bottom: .5rem; }
.content-body a { color: #3b5ca3; text-decoration: underline; text-underline-offset: 3px; transition: color .2s; }
.content-body a:hover { color: #c8962a; }
.content-body blockquote { border-left: 4px solid #c8962a; background: #fbf7eb; padding: 1rem 1.25rem; border-radius: 0 .75rem .75rem 0; margin: 1.5rem 0; color: #5b5560; }
.content-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .9375rem; display: block; overflow-x: auto; }
.content-body th, .content-body td { border: 1px solid #e2e8f0; padding: .75rem 1rem; text-align: left; white-space: nowrap; }
.content-body th { background: #f8fafc; font-weight: 600; color: #122140; }
.content-body hr { border: none; border-top: 1px solid #e2e8f0; margin: 2rem 0; }
.content-body strong { color: #122140; font-weight: 700; }