/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a1628;
            --primary-light: #1a2a4a;
            --accent: #d4a843;
            --accent-light: #e8c55a;
            --accent-dark: #b8922e;
            --bg-light: #f5f3ef;
            --bg-white: #ffffff;
            --text-dark: #1a1a2e;
            --text-body: #2d2d3a;
            --text-muted: #7a7a8a;
            --text-light: #f0f0f5;
            --border-color: #e5e3df;
            --shadow-sm: 0 2px 8px rgba(10, 22, 40, 0.06);
            --shadow-md: 0 8px 30px rgba(10, 22, 40, 0.10);
            --shadow-lg: 0 20px 60px rgba(10, 22, 40, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin-left: auto;
            margin-right: auto;
        }
        @media (max-width: 576px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ===== Typography ===== */
        .section-title {
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 0.75rem;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 3rem auto;
            text-align: center;
            line-height: 1.6;
        }
        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(212, 168, 67, 0.12);
            color: var(--accent-dark);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 100px;
            letter-spacing: 0.3px;
            margin-bottom: 1rem;
            text-transform: uppercase;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.8rem;
            }
            .section-subtitle {
                font-size: 1rem;
                margin-bottom: 2rem;
            }
        }
        @media (max-width: 576px) {
            .section-title {
                font-size: 1.5rem;
            }
        }

        /* ===== Buttons ===== */
        .btn-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 32px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary-custom {
            background: var(--accent);
            color: var(--primary);
            box-shadow: 0 4px 14px rgba(212, 168, 67, 0.35);
        }
        .btn-primary-custom:hover {
            background: var(--accent-light);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(212, 168, 67, 0.45);
        }
        .btn-outline-custom {
            background: transparent;
            color: var(--text-light);
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline-custom:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.6);
            transform: translateY(-2px);
        }
        .btn-dark-custom {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(10, 22, 40, 0.25);
        }
        .btn-dark-custom:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(10, 22, 40, 0.35);
        }
        .btn-sm-custom {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        @media (max-width: 576px) {
            .btn-custom {
                padding: 10px 24px;
                font-size: 0.9rem;
            }
        }

        /* ===== Badge / Tag ===== */
        .badge-custom {
            display: inline-block;
            background: rgba(212, 168, 67, 0.15);
            color: var(--accent-dark);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 100px;
            letter-spacing: 0.3px;
        }
        .badge-dark {
            background: rgba(10, 22, 40, 0.08);
            color: var(--primary);
        }

        /* ===== Card ===== */
        .card-custom {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            overflow: hidden;
            height: 100%;
        }
        .card-custom:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(212, 168, 67, 0.25);
        }
        .card-custom .card-img-top {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }
        .card-custom .card-body {
            padding: 1.5rem 1.5rem 1.8rem;
        }
        .card-custom .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.6rem;
            line-height: 1.4;
        }
        .card-custom .card-text {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .card-custom .card-meta {
            font-size: 0.82rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 0.5rem;
        }
        .card-custom .card-meta i {
            font-size: 0.75rem;
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .card-custom .card-img-top {
                height: 170px;
            }
            .card-custom .card-body {
                padding: 1.2rem 1.2rem 1.5rem;
            }
        }

        /* ===== Section Spacing ===== */
        .section-padding {
            padding: 5rem 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 3rem 0;
            }
        }
        @media (max-width: 576px) {
            .section-padding {
                padding: 2.5rem 0;
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 22, 40, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
            padding: 0;
        }
        .site-header .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            position: relative;
        }
        .site-header .nav-left,
        .site-header .nav-right {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
        }
        .site-header .nav-right {
            justify-content: flex-end;
        }
        .site-header .nav-center {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            z-index: 2;
        }
        .site-header .navbar-brand-custom {
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            text-decoration: none;
            white-space: nowrap;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-header .navbar-brand-custom:hover {
            color: var(--accent-light);
        }
        .site-header .nav-link-custom {
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.92rem;
            font-weight: 500;
            padding: 6px 16px;
            border-radius: 100px;
            transition: var(--transition);
            text-decoration: none;
            position: relative;
        }
        .site-header .nav-link-custom:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }
        .site-header .nav-link-custom.active {
            color: #fff;
            background: rgba(212, 168, 67, 0.18);
        }
        .site-header .nav-link-custom.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .site-header .navbar-toggler-custom {
            background: transparent;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            padding: 4px 8px;
            cursor: pointer;
            display: none;
        }
        .site-header .mobile-nav {
            display: none;
            background: var(--primary);
            padding: 1rem 0 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-header .mobile-nav .nav-link-custom {
            display: block;
            padding: 10px 24px;
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.8);
        }
        .site-header .mobile-nav .nav-link-custom.active {
            background: rgba(212, 168, 67, 0.15);
            color: var(--accent-light);
        }

        @media (max-width: 820px) {
            .site-header .nav-left,
            .site-header .nav-right .desktop-nav {
                display: none;
            }
            .site-header .navbar-toggler-custom {
                display: block;
            }
            .site-header .nav-right {
                gap: 4px;
            }
            .site-header .mobile-nav.open {
                display: block;
            }
            .site-header .nav-wrap {
                height: 64px;
            }
            .site-header .navbar-brand-custom {
                font-size: 1.15rem;
            }
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            margin-top: 0;
            padding-top: 72px;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 22, 40, 0.85) 0%, rgba(10, 22, 40, 0.60) 50%, rgba(10, 22, 40, 0.40) 100%);
            z-index: 1;
        }
        .hero-section .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 2rem 1.5rem;
        }
        .hero-section .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(212, 168, 67, 0.18);
            color: var(--accent-light);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 100px;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(212, 168, 67, 0.15);
        }
        .hero-section .hero-title {
            font-size: 3.6rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.03em;
            line-height: 1.1;
            margin-bottom: 1.2rem;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }
        .hero-section .hero-title span {
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-section .hero-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 2.2rem;
            line-height: 1.7;
        }
        .hero-section .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        @media (max-width: 768px) {
            .hero-section {
                min-height: 80vh;
                padding-top: 64px;
            }
            .hero-section .hero-title {
                font-size: 2.4rem;
            }
            .hero-section .hero-subtitle {
                font-size: 1rem;
            }
        }
        @media (max-width: 576px) {
            .hero-section .hero-title {
                font-size: 1.8rem;
            }
            .hero-section .hero-subtitle {
                font-size: 0.92rem;
            }
            .hero-section .hero-actions {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== About Section ===== */
        .about-section {
            background: var(--bg-white);
        }
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        .about-grid .about-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--bg-light);
        }
        .about-grid .about-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: var(--transition);
        }
        .about-grid .about-image:hover img {
            transform: scale(1.03);
        }
        .about-grid .about-content h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        .about-grid .about-content p {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 1.2rem;
        }
        .about-grid .about-content .about-stats {
            display: flex;
            gap: 2rem;
            margin-top: 1.8rem;
            flex-wrap: wrap;
        }
        .about-grid .about-content .about-stat {
            text-align: center;
        }
        .about-grid .about-content .about-stat .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .about-grid .about-content .about-stat .label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        @media (max-width: 820px) {
            .about-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .about-grid .about-image img {
                height: 280px;
            }
            .about-grid .about-content h2 {
                font-size: 1.6rem;
            }
        }

        /* ===== Features ===== */
        .features-section {
            background: var(--bg-light);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(212, 168, 67, 0.2);
        }
        .feature-card .icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: rgba(212, 168, 67, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.2rem;
            font-size: 1.6rem;
            color: var(--accent);
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--accent);
            color: #fff;
            transform: scale(1.05);
        }
        .feature-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.6rem;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }
        @media (max-width: 820px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.2rem;
            }
        }
        @media (max-width: 576px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .feature-card {
                padding: 1.5rem 1.2rem;
            }
        }

        /* ===== Category Spotlight ===== */
        .category-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            position: relative;
        }
        .category-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 22, 40, 0.82);
            z-index: 1;
        }
        .category-section .container {
            position: relative;
            z-index: 2;
        }
        .category-section .section-title {
            color: #fff;
        }
        .category-section .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }
        .category-section .section-badge {
            background: rgba(212, 168, 67, 0.2);
            color: var(--accent-light);
        }
        .category-card {
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2.8rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition);
            gap: 2.5rem;
            color: #fff;
            text-decoration: none;
        }
        .category-card:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(212, 168, 67, 0.3);
            transform: translateY(-4px);
            color: #fff;
        }
        .category-card .cat-img {
            flex-shrink: 0;
            width: 200px;
            height: 140px;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--primary-light);
        }
        .category-card .cat-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .category-card:hover .cat-img img {
            transform: scale(1.05);
        }
        .category-card .cat-info h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #fff;
        }
        .category-card .cat-info p {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.65);
            max-width: 480px;
            line-height: 1.7;
            margin-bottom: 1rem;
        }
        .category-card .cat-info .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--accent-light);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .category-card .cat-info .cat-link i {
            transition: var(--transition);
        }
        .category-card:hover .cat-info .cat-link i {
            transform: translateX(4px);
        }
        @media (max-width: 768px) {
            .category-card {
                flex-direction: column;
                padding: 1.8rem 1.5rem;
                gap: 1.5rem;
                text-align: center;
            }
            .category-card .cat-img {
                width: 100%;
                height: 180px;
            }
            .category-card .cat-info h3 {
                font-size: 1.3rem;
            }
            .category-card .cat-info p {
                margin-left: auto;
                margin-right: auto;
            }
        }

        /* ===== Latest Posts ===== */
        .posts-section {
            background: var(--bg-white);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }
        .posts-grid .card-custom .card-img-top {
            height: 180px;
        }
        @media (max-width: 820px) {
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.2rem;
            }
        }
        @media (max-width: 576px) {
            .posts-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
        }

        /* ===== Stats ===== */
        .stats-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 22, 40, 0.78);
            z-index: 1;
        }
        .stats-section .container {
            position: relative;
            z-index: 2;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
        }
        .stat-item {
            padding: 1.5rem 1rem;
        }
        .stat-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 0.3rem;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.6);
            font-weight: 500;
        }
        .stat-item .stat-icon {
            font-size: 1.8rem;
            color: rgba(212, 168, 67, 0.3);
            margin-bottom: 0.8rem;
        }
        @media (max-width: 820px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
            .stat-item .stat-number {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 576px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            .stat-item {
                padding: 1rem 0.5rem;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
        }

        /* ===== Process ===== */
        .process-section {
            background: var(--bg-light);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            counter-reset: step;
            position: relative;
        }
        .process-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--border-color), var(--accent));
            z-index: 0;
            opacity: 0.3;
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 2rem 1.2rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .process-step:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .process-step .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            counter-increment: step;
            position: relative;
        }
        .process-step .step-number::before {
            content: counter(step);
        }
        .process-step h5 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
        .process-step p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }
        @media (max-width: 820px) {
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.2rem;
            }
            .process-grid::before {
                display: none;
            }
        }
        @media (max-width: 576px) {
            .process-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .process-step {
                padding: 1.5rem 1rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-white);
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 1.2rem 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border-color);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            padding: 0.3rem 0;
            user-select: none;
        }
        .faq-question h5 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--primary);
            margin: 0;
            padding-right: 1rem;
            line-height: 1.5;
        }
        .faq-question .faq-toggle {
            font-size: 1.2rem;
            color: var(--accent);
            flex-shrink: 0;
            transition: var(--transition);
        }
        .faq-question.open .faq-toggle {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 0 0 0;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0.8rem 0 0.4rem;
        }
        .faq-answer p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin: 0;
        }
        @media (max-width: 576px) {
            .faq-question h5 {
                font-size: 0.95rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 22, 40, 0.88), rgba(10, 22, 40, 0.72));
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.4rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 1.05rem;
            max-width: 540px;
            margin: 0 auto 2rem;
            line-height: 1.7;
        }
        .cta-section .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        @media (max-width: 768px) {
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 576px) {
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .cta-actions {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.6);
            padding: 3rem 0 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            margin-bottom: 2rem;
        }
        .site-footer .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.8rem;
            display: inline-block;
        }
        .site-footer .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.45);
            max-width: 320px;
            line-height: 1.7;
        }
        .site-footer .footer-col h6 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1.2rem;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .site-footer .footer-col ul li {
            margin-bottom: 0.6rem;
        }
        .site-footer .footer-col ul li a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.88rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .site-footer .footer-col ul li a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.35);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--accent-light);
        }
        .site-footer .footer-social {
            display: flex;
            gap: 12px;
        }
        .site-footer .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.9rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .site-footer .footer-social a:hover {
            background: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
        }
        @media (max-width: 820px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
        }
        @media (max-width: 576px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Back to Top ===== */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary);
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            border: none;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            transform: translateY(20px);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--accent-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        /* ===== Empty State ===== */
        .empty-state {
            text-align: center;
            padding: 2rem 1rem;
            color: var(--text-muted);
            grid-column: 1 / -1;
        }
        .empty-state i {
            font-size: 2.4rem;
            color: var(--border-color);
            margin-bottom: 1rem;
        }
        .empty-state p {
            font-size: 1rem;
        }

        /* ===== Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        .btn-custom:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 420px) {
            .hero-section .hero-title {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .btn-custom {
                padding: 8px 18px;
                font-size: 0.82rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #1a3a5c;
            --primary-dark: #0f2440;
            --primary-light: #2a5a8a;
            --accent: #e8913a;
            --accent-light: #f0a850;
            --accent-dark: #c97a2e;
            --bg-white: #ffffff;
            --bg-light: #f7f9fc;
            --bg-dark: #0f2440;
            --bg-card: #ffffff;
            --text-dark: #1a2a3a;
            --text-body: #3a4a5a;
            --text-light: #7a8a9a;
            --text-white: #f0f4f8;
            --border-light: #e8ecf0;
            --border-medium: #d0d6de;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(26, 58, 92, 0.06);
            --shadow-md: 0 8px 28px rgba(26, 58, 92, 0.10);
            --shadow-lg: 0 20px 48px rgba(26, 58, 92, 0.14);
            --shadow-hover: 0 16px 40px rgba(26, 58, 92, 0.18);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
        }

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 0.5em;
        }
        p {
            margin-bottom: 1em;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }
        .site-header .container {
            height: 100%;
        }
        .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            position: relative;
        }
        .nav-left,
        .nav-right {
            flex: 1;
            display: flex;
            align-items: center;
        }
        .nav-left {
            justify-content: flex-start;
            gap: 8px;
        }
        .nav-right {
            justify-content: flex-end;
            gap: 8px;
        }
        .nav-center {
            flex: 0 0 auto;
            padding: 0 20px;
        }
        .navbar-brand-custom {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            transition: var(--transition);
            text-decoration: none;
        }
        .navbar-brand-custom:hover {
            color: var(--accent);
        }

        .nav-link-custom {
            display: inline-block;
            padding: 6px 16px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-body);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-link-custom:hover,
        .nav-link-custom:focus-visible {
            color: var(--primary);
            background: rgba(26, 58, 92, 0.06);
        }
        .nav-link-custom.active {
            color: var(--accent);
            background: rgba(232, 145, 58, 0.10);
        }

        .navbar-toggler-custom {
            display: none;
            background: none;
            border: none;
            font-size: 1.4rem;
            color: var(--primary);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
        }
        .navbar-toggler-custom:hover {
            background: rgba(26, 58, 92, 0.06);
        }

        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 24px 20px;
            flex-direction: column;
            gap: 6px;
            box-shadow: var(--shadow-md);
            border-radius: 0 0 var(--radius-md) var(--radius-md);
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link-custom {
            font-size: 1rem;
            padding: 10px 16px;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 20px;
            line-height: 1.7;
        }
        .page-banner .breadcrumb-custom {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
        }
        .page-banner .breadcrumb-custom a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
        }
        .page-banner .breadcrumb-custom a:hover {
            color: var(--accent-light);
        }
        .page-banner .breadcrumb-custom span {
            color: var(--accent-light);
        }

        /* ===== Section通用 ===== */
        .section-block {
            padding: 72px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-dark);
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            color: var(--text-light);
            font-size: 1.05rem;
            margin-top: 12px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 分类卡片网格 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            text-decoration: none;
            display: block;
            position: relative;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .category-card .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .category-card .card-body {
            padding: 20px 22px 26px;
        }
        .category-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .category-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .category-card .card-tag {
            display: inline-block;
            padding: 2px 12px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent);
            background: rgba(232, 145, 58, 0.10);
            border-radius: 20px;
            margin-bottom: 10px;
        }

        /* ===== 文章列表 ===== */
        .article-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .article-card .art-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .article-card .art-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card .art-body .art-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .article-card .art-body .art-meta i {
            margin-right: 4px;
            font-size: 0.75rem;
        }
        .article-card .art-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .article-card .art-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.65;
            margin-bottom: 16px;
            flex: 1;
        }
        .article-card .art-body .art-link {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary-light);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .article-card .art-body .art-link:hover {
            color: var(--accent);
            gap: 10px;
        }

        /* ===== 数据/统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-item {
            text-align: center;
            background: var(--bg-card);
            padding: 32px 20px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .stat-num span {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--accent);
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-top: 8px;
        }

        /* ===== 训练流程 ===== */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .flow-step {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: var(--transition);
            counter-increment: step;
        }
        .flow-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .flow-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .flow-step h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .flow-step p {
            font-size: 0.88rem;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            color: var(--primary-light);
        }
        .faq-question i {
            transition: var(--transition);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        .faq-answer p {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-block .container {
            position: relative;
            z-index: 2;
        }
        .cta-block h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-block p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-block .btn-group-custom {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-custom-primary {
            display: inline-block;
            padding: 14px 36px;
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            background: var(--accent);
            border: none;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            text-decoration: none;
            cursor: pointer;
        }
        .btn-custom-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(232, 145, 58, 0.35);
            color: #fff;
        }
        .btn-custom-outline {
            display: inline-block;
            padding: 14px 36px;
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.5);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            text-decoration: none;
            cursor: pointer;
        }
        .btn-custom-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.10);
            transform: translateY(-2px);
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .footer-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 12px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h6 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-col ul li a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .footer-social {
            display: flex;
            gap: 14px;
            margin-top: 8px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.2rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .article-list {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .flow-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            body {
                padding-top: var(--header-h);
            }
            .desktop-nav {
                display: none;
            }
            .navbar-toggler-custom {
                display: block;
            }
            .nav-left {
                display: none;
            }
            .nav-center {
                flex: 1;
                text-align: center;
                padding: 0 12px;
            }
            .navbar-brand-custom {
                font-size: 1.25rem;
            }
            .nav-wrap {
                justify-content: space-between;
            }
            .nav-right {
                flex: 0 0 auto;
            }
            .page-banner {
                padding: 60px 0 48px;
                min-height: 240px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 1rem;
            }
            .section-block {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .category-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .article-list {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .flow-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
            .cta-block .btn-group-custom {
                flex-direction: column;
                align-items: center;
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .flow-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .navbar-brand-custom {
                font-size: 1.1rem;
            }
            .faq-question {
                font-size: 0.92rem;
                padding: 14px 18px;
            }
            .faq-answer {
                padding: 0 18px 14px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .stat-num {
                font-size: 1.7rem;
            }
        }

        /* ===== Focus / Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-link-custom:focus-visible,
        .btn-custom-primary:focus-visible,
        .btn-custom-outline:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        /* ===== Smooth image load ===== */
        .category-card .card-img,
        .article-card .art-img {
            background: var(--border-light);
        }

/* roulang page: article */
:root {
            --primary: #1a2a4a;
            --primary-light: #2c4068;
            --primary-dark: #0f1a30;
            --accent: #d4a853;
            --accent-light: #e8c97a;
            --accent-dark: #b8923e;
            --bg-body: #f4f6f9;
            --bg-white: #ffffff;
            --bg-light: #eef1f5;
            --bg-dark: #0f1a30;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #7a7a9a;
            --text-light: #f0f2f5;
            --border-color: #dce1e8;
            --border-light: #e8ecf2;
            --shadow-sm: 0 2px 8px rgba(26, 42, 74, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 42, 74, 0.10);
            --shadow-lg: 0 16px 48px rgba(26, 42, 74, 0.14);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition: 0.26s cubic-bezier(0.34, 1.56, 0.64, 1);
            --max-width: 1200px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            outline: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--shadow-sm);
            backdrop-filter: blur(10px);
            background: rgba(255, 255, 255, 0.96);
        }
        .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 16px;
        }
        .nav-left {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
        }
        .nav-center {
            flex: 0 0 auto;
            text-align: center;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex: 1;
            justify-content: flex-end;
        }
        .navbar-brand-custom {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 1px;
            transition: color var(--transition);
            text-decoration: none;
        }
        .navbar-brand-custom:hover {
            color: var(--accent);
        }
        .nav-link-custom {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 16px;
            border-radius: var(--radius-sm);
            transition: background var(--transition), color var(--transition);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-link-custom:hover {
            background: var(--bg-light);
            color: var(--primary);
        }
        .nav-link-custom.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-link-custom.active:hover {
            background: var(--primary-light);
            color: #fff;
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .navbar-toggler-custom {
            display: none;
            background: none;
            border: 1px solid var(--border-color);
            font-size: 1.3rem;
            color: var(--primary);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background var(--transition);
        }
        .navbar-toggler-custom:hover {
            background: var(--bg-light);
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 12px 0 18px;
            border-top: 1px solid var(--border-light);
        }
        .mobile-nav .nav-link-custom {
            padding: 10px 16px;
            border-radius: var(--radius-sm);
        }
        .mobile-nav.open {
            display: flex;
        }
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            background: var(--primary-dark);
            color: var(--text-light);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .article-banner-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.28;
            pointer-events: none;
        }
        .article-banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 48, 0.82) 0%, rgba(26, 42, 74, 0.60) 100%);
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px 10px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 20px;
        }
        .article-breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: color var(--transition);
        }
        .article-breadcrumb a:hover {
            color: var(--accent-light);
        }
        .article-breadcrumb .separator {
            color: rgba(255, 255, 255, 0.35);
            font-size: 0.7rem;
        }
        .article-banner-title {
            font-size: 2.6rem;
            font-weight: 700;
            line-height: 1.25;
            color: #fff;
            max-width: 900px;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .article-banner-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 24px;
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.75);
        }
        .article-banner-meta .badge-custom {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.78rem;
            letter-spacing: 0.3px;
        }
        .article-banner-meta i {
            margin-right: 6px;
            opacity: 0.7;
        }
        .article-body-wrap {
            padding: 48px 0 60px;
        }
        .article-main {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 40px 48px;
            max-width: 860px;
            margin: 0 auto;
        }
        .article-content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-primary);
        }
        .article-content h2 {
            font-size: 1.55rem;
            font-weight: 700;
            margin: 32px 0 14px;
            color: var(--primary);
            line-height: 1.35;
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 26px 0 10px;
            color: var(--primary-light);
        }
        .article-content p {
            margin-bottom: 18px;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 18px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 6px;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 24px auto;
            box-shadow: var(--shadow-sm);
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: var(--bg-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content a {
            color: var(--accent-dark);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover {
            color: var(--accent);
        }
        .article-footer-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border-light);
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            background: var(--bg-light);
            color: var(--text-secondary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: #fff;
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .article-share span {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-light);
            color: var(--text-secondary);
            font-size: 1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .article-share a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .article-nav-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 16px;
            margin-top: 32px;
        }
        .article-nav-links a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
            color: var(--primary);
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: background var(--transition), border-color var(--transition);
        }
        .article-nav-links a:hover {
            background: var(--bg-light);
            border-color: var(--accent);
            color: var(--accent-dark);
        }
        .related-section {
            padding: 60px 0 72px;
            background: var(--bg-body);
        }
        .related-section .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 36px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .related-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            background: var(--bg-light);
        }
        .related-card-body {
            padding: 18px 20px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card-body .badge-custom {
            background: var(--bg-light);
            color: var(--text-secondary);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 12px;
            align-self: flex-start;
            margin-bottom: 8px;
        }
        .related-card-body h5 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 8px;
            flex: 1;
        }
        .related-card-body h5 a {
            color: inherit;
            text-decoration: none;
        }
        .related-card-body h5 a:hover {
            color: var(--accent-dark);
        }
        .related-card-body .meta {
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .cta-section {
            padding: 64px 0;
            background: var(--primary-dark);
            color: var(--text-light);
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: #fff;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .btn-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            border: none;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            text-decoration: none;
        }
        .btn-custom:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(212, 168, 83, 0.35);
        }
        .btn-custom-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            border: 2px solid var(--accent);
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), transform var(--transition);
            text-decoration: none;
        }
        .btn-custom-outline:hover {
            background: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .site-footer {
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
            padding: 52px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 36px;
            border-bottom: 1px solid var(--border-light);
        }
        .footer-logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary);
            display: block;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h6 {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--text-secondary);
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-col ul li a:hover {
            color: var(--accent-dark);
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 8px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-light);
            color: var(--text-secondary);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            padding: 20px 0;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .not-found-wrap {
            padding: 80px 0;
            text-align: center;
            min-height: 50vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .not-found-wrap .not-found-icon {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .not-found-wrap h2 {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .not-found-wrap p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .article-banner-title {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .navbar-toggler-custom {
                display: block;
            }
            .nav-left {
                display: none;
            }
            .nav-center {
                flex: 1;
                text-align: left;
            }
            .nav-right {
                flex: 0 0 auto;
            }
            .article-banner {
                padding: 60px 0 44px;
                min-height: 240px;
            }
            .article-banner-title {
                font-size: 1.6rem;
            }
            .article-main {
                padding: 24px 20px;
            }
            .article-content {
                font-size: 1rem;
            }
            .article-footer-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .article-banner-title {
                font-size: 1.3rem;
            }
            .article-banner-meta {
                font-size: 0.82rem;
                gap: 8px 16px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .article-main {
                padding: 18px 14px;
                border-radius: var(--radius-md);
            }
            .article-nav-links {
                flex-direction: column;
                align-items: stretch;
            }
            .article-nav-links a {
                justify-content: center;
            }
            .btn-custom,
            .btn-custom-outline {
                padding: 12px 24px;
                font-size: 0.92rem;
            }
        }