/* roulang page: index */
:root {
            --brand-primary: #0f2b46;
            --brand-primary-light: #1a3f64;
            --brand-accent: #c8963e;
            --brand-accent-hover: #b88735;
            --brand-accent-light: #f5e6d3;
            --brand-bg: #f9f7f4;
            --brand-bg-alt: #f0ece6;
            --brand-white: #ffffff;
            --brand-text: #1a1a1a;
            --brand-text-soft: #5a5a5a;
            --brand-text-muted: #888888;
            --brand-border: #e5e0d8;
            --brand-border-light: #f0ede6;
            --brand-shadow-sm: 0 2px 8px rgba(15, 43, 70, 0.06);
            --brand-shadow: 0 4px 20px rgba(15, 43, 70, 0.10);
            --brand-shadow-lg: 0 12px 40px rgba(15, 43, 70, 0.14);
            --brand-shadow-xl: 0 20px 60px rgba(15, 43, 70, 0.18);
            --brand-radius-sm: 8px;
            --brand-radius: 12px;
            --brand-radius-lg: 18px;
            --brand-radius-xl: 24px;
            --brand-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --brand-font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --nav-height: 68px;
            --container-max: 1200px;
        }

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

        body {
            font-family: var(--brand-font);
            line-height: 1.7;
            color: var(--brand-text);
            background-color: var(--brand-bg);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--brand-transition);
        }
        a:hover {
            color: var(--brand-accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input,
        textarea {
            font-family: inherit;
        }

        .container-custom {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        @media (min-width: 1400px) {
            .container-custom {
                max-width: 1280px;
            }
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--brand-border-light);
            transition: box-shadow var(--brand-transition), background var(--brand-transition);
        }
        .site-header.scrolled {
            box-shadow: var(--brand-shadow);
            background: rgba(255, 255, 255, 0.99);
            border-bottom-color: var(--brand-border);
        }
        .site-header .navbar {
            height: var(--nav-height);
            padding: 0;
            display: flex;
            align-items: center;
        }
        .site-header .navbar-brand {
            font-weight: 700;
            font-size: 1.55rem;
            letter-spacing: -0.01em;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            gap: 9px;
            padding: 0;
            margin-right: 36px;
            white-space: nowrap;
            transition: color var(--brand-transition);
        }
        .site-header .navbar-brand:hover {
            color: var(--brand-accent);
        }
        .site-header .navbar-brand .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--brand-radius-sm);
            background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .site-header .nav-link {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--brand-text-soft);
            padding: 8px 16px !important;
            border-radius: 6px;
            transition: all var(--brand-transition);
            position: relative;
            white-space: nowrap;
        }
        .site-header .nav-link:hover,
        .site-header .nav-link.active {
            color: var(--brand-primary);
            background: rgba(15, 43, 70, 0.04);
        }
        .site-header .nav-link.active {
            font-weight: 600;
        }
        .site-header .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--brand-accent);
        }
        .nav-cta-wrapper {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-left: auto;
        }
        .btn-nav-cta {
            background: var(--brand-accent);
            color: #fff;
            border: none;
            padding: 9px 22px;
            border-radius: 25px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--brand-transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-nav-cta:hover {
            background: var(--brand-accent-hover);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(200, 150, 62, 0.3);
        }
        .navbar-toggler {
            border: none;
            padding: 6px 10px;
            color: var(--brand-primary);
            font-size: 1.3rem;
            box-shadow: none;
            outline: none;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--brand-accent);
            outline-offset: 2px;
            border-radius: 6px;
        }
        @media (max-width: 991px) {
            .site-header .navbar-collapse {
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--brand-border);
                padding: 16px 20px;
                box-shadow: var(--brand-shadow-lg);
                border-radius: 0 0 var(--brand-radius) var(--brand-radius);
            }
            .site-header .nav-link {
                padding: 10px 14px !important;
                font-size: 0.95rem;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 10px;
                flex-wrap: wrap;
            }
            .site-header .navbar-brand {
                margin-right: auto;
            }
        }

        /* ========== HERO ========== */
        .hero-section {
            position: relative;
            min-height: calc(100vh - var(--nav-height));
            margin-top: var(--nav-height);
            display: flex;
            align-items: stretch;
            background: var(--brand-white);
            overflow: hidden;
        }
        .hero-content-side {
            flex: 1 1 50%;
            display: flex;
            align-items: center;
            padding: 60px 50px 60px 60px;
            position: relative;
            z-index: 2;
            background: var(--brand-white);
        }
        .hero-text-wrap {
            max-width: 560px;
            width: 100%;
        }
        .hero-badge {
            display: inline-block;
            background: var(--brand-accent-light);
            color: var(--brand-accent);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }
        .hero-title {
            font-size: 2.9rem;
            font-weight: 800;
            color: var(--brand-primary);
            line-height: 1.2;
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }
        .hero-title .accent {
            color: var(--brand-accent);
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--brand-text-soft);
            line-height: 1.75;
            margin-bottom: 28px;
            max-width: 480px;
        }
        .hero-btns {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-hero-primary {
            background: var(--brand-accent);
            color: #fff;
            border: none;
            padding: 13px 32px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.02em;
            transition: all var(--brand-transition);
            box-shadow: 0 6px 22px rgba(200, 150, 62, 0.25);
        }
        .btn-hero-primary:hover {
            background: var(--brand-accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(200, 150, 62, 0.4);
        }
        .btn-hero-outline {
            background: transparent;
            color: var(--brand-primary);
            border: 2px solid var(--brand-border);
            padding: 13px 32px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.02em;
            transition: all var(--brand-transition);
        }
        .btn-hero-outline:hover {
            border-color: var(--brand-accent);
            color: var(--brand-accent);
            background: var(--brand-accent-light);
        }
        .hero-visual-side {
            flex: 1 1 50%;
            position: relative;
            min-height: 500px;
            background-image: url('assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-visual-side::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 43, 70, 0.35) 0%, rgba(15, 43, 70, 0.08) 60%);
            pointer-events: none;
        }
        .hero-visual-overlay-card {
            position: absolute;
            bottom: 40px;
            right: 40px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 22px 28px;
            border-radius: var(--brand-radius-lg);
            box-shadow: var(--brand-shadow-lg);
            z-index: 3;
            max-width: 240px;
        }
        .hero-visual-overlay-card .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--brand-accent);
            line-height: 1;
        }
        .hero-visual-overlay-card .stat-label {
            font-size: 0.85rem;
            color: var(--brand-text-soft);
            margin-top: 4px;
        }
        @media (max-width: 1024px) {
            .hero-content-side {
                padding: 40px 30px;
            }
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-visual-side {
                min-height: 380px;
            }
            .hero-visual-overlay-card {
                bottom: 20px;
                right: 20px;
                padding: 16px 20px;
            }
            .hero-visual-overlay-card .stat-num {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                flex-direction: column;
                min-height: auto;
            }
            .hero-content-side {
                flex: 1 1 auto;
                padding: 36px 20px 30px;
                order: 1;
            }
            .hero-visual-side {
                flex: 1 1 auto;
                min-height: 280px;
                order: 2;
                background-position: center 30%;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-visual-overlay-card {
                bottom: 16px;
                right: 16px;
                max-width: 180px;
                padding: 14px 16px;
            }
            .hero-visual-overlay-card .stat-num {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 520px) {
            .hero-content-side {
                padding: 28px 16px 24px;
            }
            .hero-title {
                font-size: 1.55rem;
            }
            .hero-desc {
                font-size: 0.9rem;
            }
            .hero-btns {
                gap: 10px;
            }
            .btn-hero-primary,
            .btn-hero-outline {
                padding: 10px 22px;
                font-size: 0.9rem;
            }
            .hero-visual-side {
                min-height: 220px;
            }
            .hero-visual-overlay-card {
                bottom: 10px;
                right: 10px;
                max-width: 150px;
                padding: 10px 14px;
                border-radius: var(--brand-radius);
            }
            .hero-visual-overlay-card .stat-num {
                font-size: 1.2rem;
            }
            .hero-visual-overlay-card .stat-label {
                font-size: 0.75rem;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section-pad {
            padding: 80px 0;
        }
        .section-pad-sm {
            padding: 55px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-header .section-label {
            display: inline-block;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--brand-accent);
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 10px;
        }
        .section-header .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--brand-primary);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-header .section-subtitle {
            font-size: 1.05rem;
            color: var(--brand-text-soft);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-pad {
                padding: 50px 0;
            }
            .section-pad-sm {
                padding: 35px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header .section-title {
                font-size: 1.55rem;
            }
            .section-header .section-subtitle {
                font-size: 0.9rem;
            }
        }

        /* ========== STATS SECTION ========== */
        .stats-section {
            background: var(--brand-primary);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 250px;
            height: 250px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }
        .stats-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -40px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.02);
            pointer-events: none;
        }
        .stat-card {
            text-align: center;
            padding: 28px 16px;
            position: relative;
            z-index: 1;
        }
        .stat-card .stat-icon {
            font-size: 2rem;
            color: var(--brand-accent);
            margin-bottom: 10px;
        }
        .stat-card .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            line-height: 1;
            margin-bottom: 6px;
            letter-spacing: -0.02em;
        }
        .stat-card .stat-unit {
            font-size: 1rem;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.7);
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.75);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .stat-card .stat-number {
                font-size: 2rem;
            }
            .stat-card {
                padding: 20px 10px;
            }
        }

        /* ========== ADVANTAGE CARDS ========== */
        .advantage-card {
            background: var(--brand-white);
            border-radius: var(--brand-radius-lg);
            padding: 32px 28px;
            box-shadow: var(--brand-shadow-sm);
            border: 1px solid var(--brand-border-light);
            transition: all var(--brand-transition);
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .advantage-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 0;
            background: var(--brand-accent);
            transition: height var(--brand-transition);
            border-radius: 0 0 4px 0;
        }
        .advantage-card:hover {
            box-shadow: var(--brand-shadow-lg);
            transform: translateY(-3px);
            border-color: transparent;
        }
        .advantage-card:hover::before {
            height: 100%;
        }
        .advantage-card .adv-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--brand-radius);
            background: var(--brand-accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--brand-accent);
            margin-bottom: 18px;
            flex-shrink: 0;
            transition: all var(--brand-transition);
        }
        .advantage-card:hover .adv-icon {
            background: var(--brand-accent);
            color: #fff;
            transform: scale(1.05);
        }
        .advantage-card h4 {
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--brand-primary);
            margin-bottom: 8px;
        }
        .advantage-card p {
            font-size: 0.9rem;
            color: var(--brand-text-soft);
            margin: 0;
            line-height: 1.65;
        }

        /* ========== BRAND STORY ========== */
        .brand-story-section {
            background: var(--brand-white);
        }
        .brand-story-img-wrap {
            position: relative;
            border-radius: var(--brand-radius-xl);
            overflow: hidden;
            box-shadow: var(--brand-shadow-lg);
            height: 100%;
            min-height: 350px;
        }
        .brand-story-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .brand-story-img-wrap:hover img {
            transform: scale(1.04);
        }
        .brand-story-content h3 {
            font-weight: 700;
            font-size: 1.7rem;
            color: var(--brand-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }
        .brand-story-content p {
            font-size: 0.98rem;
            color: var(--brand-text-soft);
            line-height: 1.8;
            margin-bottom: 14px;
        }
        .brand-story-content .story-highlight {
            background: var(--brand-accent-light);
            border-left: 4px solid var(--brand-accent);
            padding: 16px 20px;
            border-radius: 0 var(--brand-radius-sm) var(--brand-radius-sm) 0;
            margin: 20px 0;
            font-weight: 500;
            color: var(--brand-primary);
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .brand-story-content h3 {
                font-size: 1.4rem;
            }
            .brand-story-img-wrap {
                min-height: 250px;
                margin-bottom: 24px;
            }
        }

        /* ========== SERVICE / EVENT CARDS ========== */
        .service-card {
            background: var(--brand-white);
            border-radius: var(--brand-radius-lg);
            overflow: hidden;
            box-shadow: var(--brand-shadow-sm);
            border: 1px solid var(--brand-border-light);
            transition: all var(--brand-transition);
            height: 100%;
        }
        .service-card:hover {
            box-shadow: var(--brand-shadow-lg);
            transform: translateY(-3px);
        }
        .service-card .card-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .service-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .service-card:hover .card-img-wrap img {
            transform: scale(1.07);
        }
        .service-card .card-img-wrap .card-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--brand-accent);
            color: #fff;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 20px;
            z-index: 2;
            letter-spacing: 0.02em;
        }
        .service-card .card-body-custom {
            padding: 22px 20px;
        }
        .service-card .card-body-custom h4 {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--brand-primary);
            margin-bottom: 6px;
        }
        .service-card .card-body-custom p {
            font-size: 0.88rem;
            color: var(--brand-text-soft);
            margin: 0;
            line-height: 1.55;
        }
        @media (max-width: 768px) {
            .service-card .card-img-wrap {
                height: 170px;
            }
        }

        /* ========== PARTNERS ========== */
        .partners-section {
            background: var(--brand-bg-alt);
        }
        .partner-logo-item {
            background: var(--brand-white);
            border-radius: var(--brand-radius);
            padding: 24px 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--brand-shadow-sm);
            border: 1px solid var(--brand-border-light);
            transition: all var(--brand-transition);
            min-height: 90px;
            font-weight: 600;
            color: var(--brand-text-soft);
            font-size: 1rem;
        }
        .partner-logo-item:hover {
            box-shadow: var(--brand-shadow);
            border-color: var(--brand-accent);
            color: var(--brand-accent);
            transform: translateY(-2px);
        }

        /* ========== TESTIMONIALS ========== */
        .testimonial-card {
            background: var(--brand-white);
            border-radius: var(--brand-radius-lg);
            padding: 28px 24px;
            box-shadow: var(--brand-shadow-sm);
            border: 1px solid var(--brand-border-light);
            height: 100%;
            transition: all var(--brand-transition);
            position: relative;
        }
        .testimonial-card:hover {
            box-shadow: var(--brand-shadow);
        }
        .testimonial-card .quote-icon {
            font-size: 2rem;
            color: var(--brand-accent-light);
            margin-bottom: 12px;
            opacity: 0.8;
        }
        .testimonial-card .quote-text {
            font-size: 0.95rem;
            color: var(--brand-text-soft);
            line-height: 1.7;
            margin-bottom: 16px;
            font-style: italic;
        }
        .testimonial-card .quote-author {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--brand-primary);
        }
        .testimonial-card .quote-role {
            font-size: 0.8rem;
            color: var(--brand-text-muted);
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--brand-white);
        }
        .accordion-faq .accordion-item {
            border: 1px solid var(--brand-border-light);
            border-radius: var(--brand-radius) !important;
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--brand-shadow-sm);
            transition: all var(--brand-transition);
        }
        .accordion-faq .accordion-item:hover {
            box-shadow: var(--brand-shadow);
        }
        .accordion-faq .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            color: var(--brand-primary);
            background: var(--brand-white);
            padding: 18px 22px;
            border-radius: var(--brand-radius) !important;
            box-shadow: none;
            transition: all var(--brand-transition);
        }
        .accordion-faq .accordion-button:not(.collapsed) {
            background: var(--brand-accent-light);
            color: var(--brand-primary);
            box-shadow: none;
            border-bottom: 1px solid var(--brand-border);
        }
        .accordion-faq .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(200, 150, 62, 0.2);
            border-color: var(--brand-accent);
        }
        .accordion-faq .accordion-button::after {
            background-size: 16px;
            transition: transform var(--brand-transition);
        }
        .accordion-faq .accordion-body {
            padding: 18px 22px 22px;
            font-size: 0.93rem;
            color: var(--brand-text-soft);
            line-height: 1.75;
            background: #fefdfb;
        }

        /* ========== NEWS ========== */
        .news-card {
            background: var(--brand-white);
            border-radius: var(--brand-radius-lg);
            padding: 24px 22px;
            box-shadow: var(--brand-shadow-sm);
            border: 1px solid var(--brand-border-light);
            transition: all var(--brand-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--brand-shadow-lg);
            transform: translateY(-2px);
        }
        .news-card .news-date {
            font-size: 0.8rem;
            color: var(--brand-text-muted);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }
        .news-card h5 {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--brand-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-card .news-summary {
            font-size: 0.88rem;
            color: var(--brand-text-soft);
            line-height: 1.6;
            flex-grow: 1;
            margin-bottom: 14px;
        }
        .btn-read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--brand-accent);
            transition: all var(--brand-transition);
            align-self: flex-start;
        }
        .btn-read-more:hover {
            color: var(--brand-accent-hover);
            gap: 10px;
        }
        .btn-read-more i {
            font-size: 0.75rem;
            transition: transform var(--brand-transition);
        }
        .btn-read-more:hover i {
            transform: translateX(3px);
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-light) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            top: -100px;
            right: -80px;
            pointer-events: none;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 650px;
            margin: 0 auto;
        }
        .cta-section h3 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 26px;
        }
        .btn-cta-large {
            background: var(--brand-accent);
            color: #fff;
            border: none;
            padding: 14px 38px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 1.05rem;
            letter-spacing: 0.02em;
            transition: all var(--brand-transition);
            box-shadow: 0 8px 28px rgba(200, 150, 62, 0.35);
        }
        .btn-cta-large:hover {
            background: #fff;
            color: var(--brand-primary);
            transform: translateY(-2px);
            box-shadow: 0 14px 36px rgba(0, 0, 0, 0.2);
        }
        @media (max-width: 768px) {
            .cta-section h3 {
                font-size: 1.4rem;
            }
            .cta-section p {
                font-size: 0.9rem;
            }
            .btn-cta-large {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0a1e33;
            color: rgba(255, 255, 255, 0.7);
            padding: 50px 0 28px;
        }
        .site-footer .footer-brand {
            font-weight: 700;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 10px;
        }
        .site-footer .footer-desc {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.6;
            margin-bottom: 16px;
            max-width: 300px;
        }
        .site-footer h6 {
            font-weight: 700;
            font-size: 0.95rem;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer .footer-links li {
            margin-bottom: 8px;
        }
        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.88rem;
            transition: all var(--brand-transition);
        }
        .site-footer .footer-links a:hover {
            color: var(--brand-accent);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 36px;
            padding-top: 20px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
            text-align: center;
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 36px 0 22px;
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }

        /* ========== BACK TO TOP ========== */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1040;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--brand-accent);
            color: #fff;
            border: none;
            box-shadow: var(--brand-shadow);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            transition: all var(--brand-transition);
            opacity: 0;
            pointer-events: none;
            transform: translateY(10px);
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--brand-accent-hover);
            transform: translateY(-3px);
            box-shadow: var(--brand-shadow-lg);
        }

        /* Utility */
        .text-accent {
            color: var(--brand-accent) !important;
        }
        .bg-soft {
            background: var(--brand-bg);
        }
        .bg-white-off {
            background: var(--brand-white);
        }

/* roulang page: category4 */
:root {
            --primary: #1a365d;
            --primary-light: #234b7a;
            --primary-dark: #0f2240;
            --accent: #c8822a;
            --accent-light: #e09d3c;
            --accent-dark: #a06820;
            --bg-light: #f8f9fb;
            --bg-white: #ffffff;
            --bg-soft: #eef1f6;
            --text-dark: #1a1a2e;
            --text-body: #3a3d4a;
            --text-muted: #6b7084;
            --text-light: #9095a8;
            --border: #e0e3eb;
            --border-light: #eceef4;
            --shadow-sm: 0 1px 3px rgba(15, 34, 64, 0.06);
            --shadow-md: 0 4px 16px rgba(15, 34, 64, 0.09);
            --shadow-lg: 0 8px 32px rgba(15, 34, 64, 0.12);
            --shadow-xl: 0 16px 48px rgba(15, 34, 64, 0.16);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Segoe UI', sans-serif;
            --section-gap: 80px;
            --section-gap-sm: 48px;
            --container-max: 1200px;
        }

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

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

        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--bg-white);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 3px;
        }

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

        button {
            font-family: var(--font-body);
        }
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            color: var(--text-dark);
            font-weight: 700;
            line-height: 1.3;
            margin-top: 0;
        }

        .container-custom {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ========== HEADER & NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .navbar {
            padding: 10px 0;
            min-height: 62px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: nowrap;
        }
        .navbar-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--primary-dark) !important;
            letter-spacing: -0.01em;
            white-space: nowrap;
            text-decoration: none;
            transition: opacity var(--transition);
        }
        .navbar-brand:hover {
            opacity: 0.85;
            color: var(--primary-dark) !important;
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
            color: #fff;
            font-weight: 900;
            font-size: 1.15rem;
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(200, 130, 42, 0.35);
        }
        .navbar-toggler {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 12px;
            font-size: 1.2rem;
            color: var(--text-dark);
            background: var(--bg-white);
            transition: all var(--transition);
        }
        .navbar-toggler:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: #fdf8f2;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(200, 130, 42, 0.18);
            outline: none;
        }
        .navbar-nav {
            gap: 4px;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-body) !important;
            padding: 8px 16px !important;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-link:hover {
            color: var(--accent) !important;
            background: #fdf8f2;
        }
        .nav-link.active {
            color: var(--accent) !important;
            background: #fef9f3;
            font-weight: 700;
            position: relative;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2.5px;
            background: var(--accent);
            border-radius: 3px;
        }
        .nav-cta-wrapper {
            margin-left: 16px;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            background: var(--accent);
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: 0.02em;
            box-shadow: 0 2px 10px rgba(200, 130, 42, 0.3);
        }
        .btn-nav-cta:hover {
            background: var(--accent-dark);
            box-shadow: 0 4px 18px rgba(200, 130, 42, 0.42);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 1px 4px rgba(200, 130, 42, 0.3);
        }

        @media (max-width: 991px) {
            .navbar-collapse {
                background: rgba(255, 255, 255, 0.98);
                border-radius: var(--radius-md);
                padding: 12px 16px;
                margin-top: 8px;
                box-shadow: var(--shadow-lg);
                border: 1px solid var(--border-light);
            }
            .navbar-nav {
                gap: 2px;
                margin-bottom: 8px;
            }
            .nav-link {
                padding: 10px 14px !important;
                font-size: 0.95rem;
                border-radius: var(--radius-sm);
            }
            .nav-link.active::after {
                display: none;
            }
            .nav-link.active {
                border-left: 3px solid var(--accent);
                background: #fef9f3;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 6px;
            }
            .btn-nav-cta {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
            }
        }
        @media (max-width: 520px) {
            .navbar-brand {
                font-size: 1.15rem;
            }
            .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 1rem;
                border-radius: 8px;
            }
            .navbar {
                padding: 8px 0;
                min-height: 54px;
            }
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            position: relative;
            background: linear-gradient(160deg, #1a365d 0%, #0f2240 50%, #162544 100%);
            color: #fff;
            padding: 72px 0 64px;
            overflow: hidden;
            text-align: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.22;
            z-index: 0;
            pointer-events: none;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 1;
        }
        .page-banner .banner-badge {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: #fdd9a8;
            margin-bottom: 16px;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .page-banner .banner-subtitle {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .page-banner {
                padding: 48px 0 40px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner .banner-subtitle {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .page-banner .banner-subtitle {
                font-size: 0.9rem;
            }
        }

        /* ========== SECTION TITLES ========== */
        .section-title-wrap {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-title-wrap .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            color: var(--accent);
            text-transform: uppercase;
            margin-bottom: 8px;
        }
        .section-title-wrap h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .section-title-wrap .section-desc {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title-wrap h2 {
                font-size: 1.55rem;
            }
        }

        /* ========== BUTTONS ========== */
        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 30px;
            font-weight: 700;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            color: #fff;
            background: var(--accent);
            border: none;
            border-radius: 50px;
            cursor: pointer;
            text-decoration: none;
            transition: all var(--transition);
            box-shadow: var(--shadow-md);
        }
        .btn-primary-custom:hover {
            background: var(--accent-dark);
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-primary-custom:active {
            transform: translateY(0);
        }
        .btn-outline-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 30px;
            font-weight: 700;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            color: var(--primary);
            background: transparent;
            border: 2px solid var(--primary);
            border-radius: 50px;
            cursor: pointer;
            text-decoration: none;
            transition: all var(--transition);
        }
        .btn-outline-custom:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .btn-outline-custom:active {
            transform: translateY(0);
        }

        /* ========== STATS ROW ========== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            text-align: center;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: #e8d5b8;
        }
        .stat-card .stat-number {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--primary);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-card .stat-number span {
            color: var(--accent);
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-card .stat-number {
                font-size: 1.9rem;
            }
        }
        @media (max-width: 520px) {
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 14px;
            }
            .stat-card .stat-number {
                font-size: 1.5rem;
            }
            .stat-card .stat-label {
                font-size: 0.8rem;
            }
        }

        /* ========== COOPERATION MODE CARDS ========== */
        .mode-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .mode-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .mode-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 0;
            background: var(--accent);
            transition: height var(--transition);
            border-radius: 0 0 4px 0;
        }
        .mode-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: #e8d5b8;
        }
        .mode-card:hover::before {
            height: 60px;
        }
        .mode-card .mode-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fef9f3 0%, #fdf2e4 100%);
            color: var(--accent);
            flex-shrink: 0;
        }
        .mode-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .mode-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .mode-card .mode-tag {
            display: inline-block;
            margin-top: 12px;
            padding: 4px 12px;
            font-size: 0.78rem;
            font-weight: 600;
            border-radius: 50px;
            background: #fef9f3;
            color: var(--accent);
            letter-spacing: 0.03em;
        }
        @media (max-width: 991px) {
            .mode-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 600px) {
            .mode-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .mode-card {
                padding: 24px 20px;
            }
        }

        /* ========== CASE CARDS ========== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .case-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .case-card:hover {
            box-shadow: var(--shadow-xl);
            transform: translateY(-4px);
        }
        .case-card .case-img-wrap {
            height: 220px;
            overflow: hidden;
            position: relative;
            background: #eef1f6;
        }
        .case-card .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card:hover .case-img-wrap img {
            transform: scale(1.06);
        }
        .case-card .case-body {
            padding: 20px 22px;
        }
        .case-card .case-body h4 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-dark);
        }
        .case-card .case-body .case-meta {
            font-size: 0.8rem;
            color: var(--accent);
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 8px;
        }
        .case-card .case-body p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.55;
        }
        @media (max-width: 991px) {
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 600px) {
            .case-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .case-card .case-img-wrap {
                height: 180px;
            }
        }

        /* ========== PROCESS STEPS ========== */
        .process-steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0;
            counter-reset: step;
        }
        .process-step {
            flex: 1 1 180px;
            max-width: 220px;
            text-align: center;
            position: relative;
            padding: 20px 16px;
        }
        .process-step::after {
            content: '';
            position: absolute;
            top: 44px;
            right: -20px;
            width: 40px;
            height: 2px;
            background: var(--border);
            z-index: 0;
        }
        .process-step:last-child::after {
            display: none;
        }
        .process-step .step-circle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #fff;
            font-weight: 900;
            font-size: 1.3rem;
            position: relative;
            z-index: 2;
            margin-bottom: 14px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
        }
        .process-step:hover .step-circle {
            box-shadow: var(--shadow-lg);
            transform: scale(1.08);
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
        }
        .process-step h5 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 4px;
            position: relative;
            z-index: 1;
        }
        .process-step .step-desc {
            font-size: 0.82rem;
            color: var(--text-muted);
            position: relative;
            z-index: 1;
        }
        @media (max-width: 768px) {
            .process-steps {
                flex-direction: column;
                align-items: center;
                gap: 12px;
            }
            .process-step {
                max-width: 100%;
                flex: 1 1 auto;
                display: flex;
                align-items: center;
                gap: 16px;
                text-align: left;
                padding: 12px 0;
            }
            .process-step::after {
                display: none;
            }
            .process-step .step-circle {
                margin-bottom: 0;
                flex-shrink: 0;
            }
        }

        /* ========== ADVANTAGE LIST ========== */
        .advantage-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .advantage-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 24px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .advantage-item:hover {
            box-shadow: var(--shadow-md);
            border-color: #e8d5b8;
        }
        .advantage-item .adv-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: #fef9f3;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--accent);
            flex-shrink: 0;
        }
        .advantage-item .adv-text h5 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .advantage-item .adv-text p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0;
        }
        @media (max-width: 768px) {
            .advantage-list {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ========== FAQ SECTION ========== */
        .faq-accordion .accordion-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md) !important;
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .faq-accordion .accordion-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-accordion .accordion-button {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-dark);
            background: var(--bg-white);
            padding: 18px 24px;
            border-radius: var(--radius-md) !important;
            transition: all var(--transition);
            box-shadow: none;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--accent);
            background: #fefaf5;
            box-shadow: none;
            border-bottom: 1px solid var(--border-light);
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(200, 130, 42, 0.15);
            border-color: var(--accent);
        }
        .faq-accordion .accordion-body {
            padding: 18px 24px;
            font-size: 0.93rem;
            color: var(--text-body);
            line-height: 1.7;
            background: #fefefe;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(150deg, #1a365d 0%, #162544 40%, #0f2240 100%);
            color: #fff;
            padding: 56px 0;
            text-align: center;
            border-radius: var(--radius-xl);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
            pointer-events: none;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 8px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-section .btn-cta-lg {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 38px;
            font-size: 1.05rem;
            font-weight: 700;
            color: #1a365d;
            background: #fff;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            text-decoration: none;
            letter-spacing: 0.03em;
            transition: all var(--transition);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        }
        .cta-section .btn-cta-lg:hover {
            background: #fdd9a8;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
            transform: translateY(-3px);
            color: #1a365d;
        }
        @media (max-width: 768px) {
            .cta-section {
                border-radius: var(--radius-lg);
                padding: 40px 20px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-section .btn-cta-lg {
                padding: 14px 30px;
                font-size: 0.95rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0f1a2e;
            color: rgba(255, 255, 255, 0.72);
            padding: 48px 0 20px;
            margin-top: var(--section-gap);
            font-size: 0.9rem;
        }
        .site-footer .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 10px;
            font-family: var(--font-heading);
        }
        .site-footer .footer-desc {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.6;
            max-width: 360px;
        }
        .site-footer h6 {
            font-size: 0.85rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            margin-bottom: 14px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links li a {
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: color var(--transition);
            font-size: 0.88rem;
        }
        .footer-links li a:hover {
            color: #fdd9a8;
            text-decoration: none;
        }
        .footer-bottom {
            margin-top: 32px;
            padding-top: 18px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 36px 0 16px;
            }
            .site-footer .footer-brand {
                font-size: 1.3rem;
            }
        }

        /* ========== UTILITY ========== */
        .section-padding {
            padding: var(--section-gap) 0;
        }
        .section-padding-sm {
            padding: var(--section-gap-sm) 0;
        }
        .bg-soft {
            background: var(--bg-soft);
        }
        .bg-light-custom {
            background: var(--bg-light);
        }
        .text-accent {
            color: var(--accent) !important;
        }
        .mt-section {
            margin-top: var(--section-gap);
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: var(--section-gap-sm) 0;
            }
            .section-padding-sm {
                padding: 36px 0;
            }
            .mt-section {
                margin-top: var(--section-gap-sm);
            }
        }

/* roulang page: category2 */
:root {
            --brand-primary: #1a3c5e;
            --brand-primary-light: #1f4d78;
            --brand-primary-dark: #0f2a42;
            --brand-accent: #e8943a;
            --brand-accent-light: #f0a855;
            --brand-accent-glow: rgba(232, 148, 58, 0.2);
            --bg-page: #f5f6f8;
            --bg-white: #ffffff;
            --bg-light: #f9fafb;
            --bg-card: #ffffff;
            --bg-dark-section: #1a2d3d;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a5e;
            --text-muted: #7a7a8e;
            --text-light: #9a9aae;
            --text-on-dark: #e8e8f0;
            --border-color: #e2e5ea;
            --border-light: #eef0f3;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
            --shadow-accent: 0 4px 20px rgba(232, 148, 58, 0.25);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --transition-fast: 0.18s ease;
            --transition-base: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-heading: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
            --font-body: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-page);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--brand-accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--brand-accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

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

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .site-header .navbar {
            padding: 0;
            min-height: 62px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: nowrap;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--brand-primary) !important;
            letter-spacing: 1px;
            white-space: nowrap;
            padding: 8px 0;
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-light));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 1.1rem;
            letter-spacing: 0;
            flex-shrink: 0;
        }
        .navbar-brand:hover {
            color: var(--brand-primary-light) !important;
        }
        .navbar-toggler {
            border: none;
            background: transparent;
            font-size: 1.4rem;
            color: var(--text-primary);
            padding: 8px 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .navbar-toggler:hover {
            background: var(--bg-light);
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--brand-accent);
            outline-offset: 2px;
        }
        .navbar-collapse {
            flex-grow: 0;
        }
        #mainNav .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        #mainNav .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 10px 16px;
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        #mainNav .nav-link:hover {
            color: var(--brand-primary);
            background: rgba(26, 60, 94, 0.05);
        }
        #mainNav .nav-link.active {
            color: var(--brand-primary);
            background: rgba(26, 60, 94, 0.08);
            font-weight: 600;
        }
        .nav-cta-wrapper {
            margin-left: 16px;
            flex-shrink: 0;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            background: var(--brand-accent);
            color: #fff;
            border: none;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.4px;
            transition: all var(--transition-base);
            box-shadow: 0 2px 10px rgba(232, 148, 58, 0.3);
            white-space: nowrap;
        }
        .btn-nav-cta:hover {
            background: var(--brand-accent-light);
            box-shadow: 0 4px 18px rgba(232, 148, 58, 0.45);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 1px 6px rgba(232, 148, 58, 0.25);
        }

        @media (max-width: 991px) {
            .navbar-collapse {
                position: absolute;
                top: 62px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                padding: 16px 20px;
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                max-height: 70vh;
                overflow-y: auto;
            }
            #mainNav .navbar-nav {
                flex-direction: column;
                gap: 2px;
                align-items: stretch;
            }
            #mainNav .nav-link {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 0.95rem;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 12px;
                display: flex;
                justify-content: stretch;
            }
            .btn-nav-cta {
                width: 100%;
                justify-content: center;
                padding: 13px 22px;
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .site-header .navbar {
                min-height: 54px;
            }
            .navbar-brand {
                font-size: 1.15rem;
                gap: 7px;
            }
            .navbar-brand .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 0.95rem;
                border-radius: 6px;
            }
            .navbar-collapse {
                top: 54px;
            }
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0f2a42 0%, #1a3c5e 40%, #1f4d78 100%);
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 42, 66, 0.88) 0%, rgba(26, 60, 94, 0.78) 50%, rgba(31, 77, 120, 0.72) 100%);
            z-index: 1;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 2;
            padding: 60px 0;
        }
        .page-banner .banner-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(232, 148, 58, 0.2);
            color: var(--brand-accent-light);
            border: 1px solid rgba(232, 148, 58, 0.35);
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .page-banner h1 {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 1px;
            line-height: 1.25;
        }
        .page-banner .banner-subtitle {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            line-height: 1.7;
        }
        .page-banner .banner-stats-row {
            display: flex;
            gap: 32px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .page-banner .banner-stat-item {
            display: flex;
            flex-direction: column;
        }
        .page-banner .banner-stat-num {
            font-size: 2rem;
            font-weight: 700;
            color: var(--brand-accent-light);
            font-family: var(--font-heading);
            letter-spacing: 1px;
        }
        .page-banner .banner-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 2px;
        }
        @media (max-width: 768px) {
            .page-banner {
                min-height: 300px;
            }
            .page-banner h1 {
                font-size: 1.9rem;
            }
            .page-banner .banner-subtitle {
                font-size: 1rem;
            }
            .page-banner .banner-stats-row {
                gap: 20px;
            }
            .page-banner .banner-stat-num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .page-banner {
                min-height: 260px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .banner-content {
                padding: 40px 0;
            }
            .page-banner .banner-stats-row {
                gap: 14px;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section-padding {
            padding: 64px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 44px 0;
            }
        }
        @media (max-width: 520px) {
            .section-padding {
                padding: 32px 0;
            }
        }
        .section-label {
            display: inline-block;
            padding: 5px 14px;
            background: rgba(26, 60, 94, 0.06);
            color: var(--brand-primary);
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 1.5px;
            margin-bottom: 10px;
            text-transform: uppercase;
        }
        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: 0.5px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.6rem;
            }
            .section-desc {
                font-size: 0.95rem;
            }
        }

        /* ========== STAT CARDS ========== */
        .stat-card-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        @media (max-width: 991px) {
            .stat-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .stat-card-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .stat-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .stat-card:hover::after {
            opacity: 1;
        }
        .stat-card .stat-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: rgba(26, 60, 94, 0.07);
            color: var(--brand-primary);
            font-size: 1.5rem;
            margin-bottom: 14px;
            transition: all var(--transition-base);
        }
        .stat-card:hover .stat-icon {
            background: var(--brand-primary);
            color: #fff;
            transform: scale(1.08);
        }
        .stat-card .stat-number {
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--text-primary);
            font-family: var(--font-heading);
            letter-spacing: 0.5px;
            line-height: 1.2;
        }
        .stat-card .stat-unit {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-muted);
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .stat-card .stat-trend {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            color: #16a34a;
            margin-top: 4px;
        }
        .stat-card .stat-trend.up {
            color: #16a34a;
        }
        .stat-card .stat-trend i {
            font-size: 0.7rem;
        }

        /* ========== CONTENT GRID ========== */
        .content-grid-2col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        @media (max-width: 991px) {
            .content-grid-2col {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }
        .content-grid-2col .content-image-wrap {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .content-grid-2col .content-image-wrap img {
            width: 100%;
            height: auto;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .content-grid-2col .content-image-wrap:hover img {
            transform: scale(1.03);
        }
        .content-grid-2col .content-image-wrap .img-badge {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: rgba(0, 0, 0, 0.7);
            color: #fff;
            padding: 6px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 500;
            backdrop-filter: blur(4px);
        }
        .content-text h2 {
            font-family: var(--font-heading);
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .content-text p {
            color: var(--text-secondary);
            font-size: 0.98rem;
            line-height: 1.75;
            margin-bottom: 12px;
        }
        .content-text .feature-list {
            list-style: none;
            padding: 0;
            margin: 16px 0 0;
        }
        .content-text .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 8px 0;
            font-size: 0.95rem;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
        }
        .content-text .feature-list li:last-child {
            border-bottom: none;
        }
        .content-text .feature-list li i {
            color: var(--brand-accent);
            font-size: 0.9rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ========== METHOD CARDS ========== */
        .method-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        @media (max-width: 991px) {
            .method-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .method-card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        .method-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all var(--transition-base);
            text-align: center;
            position: relative;
        }
        .method-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }
        .method-card .method-icon-circle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(26, 60, 94, 0.08), rgba(26, 60, 94, 0.14));
            color: var(--brand-primary);
            font-size: 1.6rem;
            margin-bottom: 16px;
            transition: all var(--transition-base);
        }
        .method-card:hover .method-icon-circle {
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-light));
            color: #fff;
            box-shadow: 0 8px 24px rgba(26, 60, 94, 0.3);
        }
        .method-card h4 {
            font-family: var(--font-heading);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .method-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin: 0;
        }
        .method-card .method-tag {
            display: inline-block;
            padding: 3px 10px;
            background: rgba(232, 148, 58, 0.1);
            color: var(--brand-accent);
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            margin-top: 10px;
        }

        /* ========== REPORT LIST ========== */
        .report-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .report-list li {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition-fast);
            cursor: pointer;
            flex-wrap: wrap;
        }
        .report-list li:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--brand-accent);
            transform: translateX(3px);
        }
        .report-list .report-date {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--brand-accent);
            background: rgba(232, 148, 58, 0.1);
            padding: 5px 12px;
            border-radius: var(--radius-full);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .report-list .report-info {
            flex: 1;
            min-width: 180px;
        }
        .report-list .report-title {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 1rem;
            margin-bottom: 2px;
        }
        .report-list .report-summary {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
        }
        .report-list .report-arrow {
            color: var(--text-light);
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }
        .report-list li:hover .report-arrow {
            color: var(--brand-accent);
            transform: translateX(4px);
        }
        @media (max-width: 520px) {
            .report-list li {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .report-list .report-arrow {
                align-self: flex-end;
            }
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--brand-primary-dark) 0%, var(--brand-primary) 50%, var(--brand-primary-light) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(232, 148, 58, 0.18) 0%, transparent 70%);
            top: -100px;
            right: -80px;
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 56px 20px;
        }
        .cta-section h2 {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.05rem;
            max-width: 550px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: var(--brand-accent);
            color: #fff;
            border: none;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.5px;
            transition: all var(--transition-base);
            box-shadow: 0 6px 22px rgba(232, 148, 58, 0.4);
        }
        .btn-cta-primary:hover {
            background: var(--brand-accent-light);
            box-shadow: 0 8px 30px rgba(232, 148, 58, 0.55);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-cta-primary:active {
            transform: translateY(0);
        }
        .btn-outline-light-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.4px;
            transition: all var(--transition-base);
            margin-left: 12px;
        }
        .btn-outline-light-custom:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
        }
        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .btn-cta-primary,
            .btn-outline-light-custom {
                display: flex;
                width: 100%;
                justify-content: center;
                margin: 0 0 10px;
                padding: 13px 24px;
                font-size: 0.9rem;
            }
            .btn-outline-light-custom {
                margin-left: 0;
            }
        }

        /* ========== FAQ ========== */
        .faq-accordion .accordion-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md) !important;
            margin-bottom: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: var(--bg-card);
        }
        .faq-accordion .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: var(--bg-card);
            padding: 18px 20px;
            border-radius: var(--radius-md) !important;
            box-shadow: none;
            transition: all var(--transition-fast);
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--brand-primary);
            background: rgba(26, 60, 94, 0.03);
            box-shadow: none;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: var(--brand-accent);
        }
        .faq-accordion .accordion-button::after {
            transition: transform var(--transition-fast);
        }
        .faq-accordion .accordion-body {
            padding: 10px 20px 20px;
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.75;
            background: var(--bg-card);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #1a1a2e;
            color: var(--text-on-dark);
            padding: 48px 0 0;
            font-size: 0.92rem;
        }
        .site-footer .footer-brand {
            font-family: var(--font-heading);
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }
        .site-footer .footer-desc {
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 340px;
        }
        .site-footer h6 {
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer .footer-links li {
            margin-bottom: 8px;
        }
        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition-fast);
            font-size: 0.88rem;
        }
        .site-footer .footer-links a:hover {
            color: var(--brand-accent-light);
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding: 18px 0;
            margin-top: 36px;
            text-align: center;
            color: rgba(255, 255, 255, 0.45);
            font-size: 0.82rem;
            letter-spacing: 0.3px;
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 36px 0 0;
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }

        /* ========== DIVIDER ========== */
        .divider-accent {
            width: 50px;
            height: 3px;
            background: var(--brand-accent);
            border-radius: 3px;
            margin: 0 auto 20px;
        }

        /* ========== ANIMATIONS ========== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        .animate-delay-1 {
            animation-delay: 0.1s;
            opacity: 0;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
            opacity: 0;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
            opacity: 0;
        }
        .animate-delay-4 {
            animation-delay: 0.4s;
            opacity: 0;
        }

        /* ========== DATA BAR VISUAL ========== */
        .data-bar-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 16px;
        }
        .data-bar-item {
            flex: 1;
            min-width: 140px;
        }
        .data-bar-item .bar-label {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: 6px;
            font-weight: 500;
        }
        .data-bar-item .bar-track {
            height: 8px;
            background: #eef0f3;
            border-radius: 10px;
            overflow: hidden;
        }
        .data-bar-item .bar-fill {
            height: 100%;
            border-radius: 10px;
            background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
            transition: width 1.2s ease;
            width: 0;
        }
        .data-bar-item .bar-fill.animated {
            width: var(--bar-width);
        }

        /* ========== TIMELINE ========== */
        .mini-timeline {
            position: relative;
            padding-left: 28px;
            margin-top: 12px;
        }
        .mini-timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 4px;
            bottom: 4px;
            width: 2px;
            background: var(--border-color);
            border-radius: 1px;
        }
        .mini-timeline .tl-item {
            position: relative;
            margin-bottom: 16px;
            padding-left: 12px;
        }
        .mini-timeline .tl-item::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--brand-accent);
            border: 2px solid #fff;
            box-shadow: 0 0 0 2px var(--brand-accent);
        }
        .mini-timeline .tl-item .tl-title {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
        }
        .mini-timeline .tl-item .tl-desc {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin: 0;
        }

/* roulang page: category1 */
:root {
            --color-primary: #1a4ed8;
            --color-primary-dark: #143da8;
            --color-primary-light: #e8eefb;
            --color-accent: #f08c2e;
            --color-accent-light: #fff7f0;
            --color-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-soft: #64748b;
            --color-text-light: #94a3b8;
            --color-bg: #f8fafc;
            --color-white: #ffffff;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.06);
            --transition-fast: 0.18s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --section-gap: 80px;
            --section-gap-md: 56px;
            --section-gap-sm: 40px;
        }

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

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

        body {
            font-family: var(--font-sans);
            color: var(--color-text);
            background-color: var(--color-bg);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            font-size: 16px;
        }

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

        a {
            text-decoration: none;
            color: var(--color-primary);
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .navbar {
            padding: 12px 0;
            flex-wrap: wrap;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--color-dark) !important;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary) 0%, #3b6df0 100%);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 1.1rem;
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .navbar-brand:hover {
            color: var(--color-primary) !important;
        }
        .navbar-brand:hover .brand-icon {
            transform: scale(1.04);
            transition: transform var(--transition-fast);
        }

        .navbar-toggler {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 8px 12px;
            color: var(--color-text);
            background: var(--color-white);
            transition: all var(--transition-fast);
        }
        .navbar-toggler:hover {
            background: var(--color-primary-light);
            border-color: var(--color-primary);
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 78, 216, 0.2);
            outline: none;
        }
        .navbar-toggler i {
            font-size: 1.3rem;
        }

        .navbar-nav {
            gap: 4px;
        }
        .nav-item {
            list-style: none;
        }
        .nav-link {
            color: var(--color-text-soft) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 15px !important;
            border-radius: 6px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--color-primary) !important;
            background-color: var(--color-primary-light);
        }
        .nav-link.active {
            color: var(--color-primary) !important;
            background-color: var(--color-primary-light);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 15px;
            right: 15px;
            height: 2.5px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .nav-cta-wrapper {
            margin-left: 12px;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            background: var(--color-primary);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.2px;
        }
        .btn-nav-cta:hover {
            background: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--color-dark);
            overflow: hidden;
            isolation: isolate;
        }
        .page-banner .banner-bg {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
            opacity: 0.45;
            filter: brightness(0.7);
        }
        .page-banner .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.55) 0%, rgba(15, 23, 42, 0.78) 100%);
            z-index: 1;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 24px;
            color: #fff;
        }
        .page-banner .breadcrumb-nav {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .page-banner .breadcrumb-nav a {
            color: rgba(255, 255, 255, 0.85);
            transition: color var(--transition-fast);
        }
        .page-banner .breadcrumb-nav a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .page-banner .breadcrumb-nav .separator {
            color: rgba(255, 255, 255, 0.5);
        }
        .page-banner .banner-title {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            color: #fff;
            line-height: 1.2;
        }
        .page-banner .banner-subtitle {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* ========== SECTIONS ========== */
        .section {
            padding: var(--section-gap) 0;
        }
        .section-sm {
            padding: var(--section-gap-md) 0;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-dark);
            margin-bottom: 10px;
            letter-spacing: -0.3px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--color-text-soft);
            max-width: 680px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header.text-center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== CARDS ========== */
        .card-custom {
            background: var(--color-white);
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: all var(--transition-base);
            height: 100%;
            box-shadow: var(--shadow-sm);
        }
        .card-custom:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: transparent;
        }
        .card-custom .card-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            font-size: 1.4rem;
            margin-bottom: 16px;
            flex-shrink: 0;
        }
        .card-custom .card-icon.blue {
            background: #e8eefb;
            color: var(--color-primary);
        }
        .card-custom .card-icon.amber {
            background: var(--color-accent-light);
            color: var(--color-accent);
        }
        .card-custom .card-icon.green {
            background: #e6f7ee;
            color: #10b981;
        }
        .card-custom .card-icon.purple {
            background: #f3eeff;
            color: #7c3aed;
        }
        .card-custom h4 {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--color-dark);
            margin-bottom: 8px;
        }
        .card-custom p {
            font-size: 0.93rem;
            color: var(--color-text-soft);
            margin: 0;
            line-height: 1.6;
        }

        /* 图片卡片 */
        .card-image {
            background: var(--color-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            height: 100%;
            border: 1px solid var(--color-border-light);
        }
        .card-image:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .card-image .card-img-top {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-image .card-body {
            padding: 20px 18px;
        }
        .card-image .card-body h5 {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--color-dark);
            margin-bottom: 6px;
        }
        .card-image .card-body p {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            margin: 0;
            line-height: 1.55;
        }

        /* ========== STAT BLOCK ========== */
        .stat-card {
            text-align: center;
            padding: 24px 16px;
            background: var(--color-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-card .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -1px;
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            font-weight: 500;
        }

        /* ========== OVERVIEW BLOCK ========== */
        .overview-image {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .overview-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform var(--transition-slow);
        }
        .overview-image:hover img {
            transform: scale(1.03);
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-white);
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            border-color: var(--color-border);
            box-shadow: var(--shadow-md);
        }
        .faq-item .faq-question {
            padding: 18px 22px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--color-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-item .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-item .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            color: var(--color-primary);
            transition: all var(--transition-base);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
            background: var(--color-primary);
            color: #fff;
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-base);
            padding: 0 22px;
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            padding: 0 22px 18px 22px;
        }
        .faq-item .faq-answer p {
            margin: 0;
            font-size: 0.93rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-dark) 0%, #1a2744 60%, #162040 100%);
            color: #fff;
            text-align: center;
            padding: 64px 24px;
            border-radius: var(--radius-xl);
            position: relative;
            overflow: hidden;
            isolation: isolate;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 20%, rgba(26, 78, 216, 0.25) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 70%, rgba(240, 140, 46, 0.18) 0%, transparent 60%);
            z-index: 0;
            pointer-events: none;
        }
        .cta-section>* {
            position: relative;
            z-index: 1;
        }
        .cta-section h3 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 24px;
            line-height: 1.6;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 32px;
            background: var(--color-accent);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all var(--transition-base);
            letter-spacing: 0.3px;
            box-shadow: 0 4px 18px rgba(240, 140, 46, 0.35);
        }
        .btn-cta:hover {
            background: #e07d1a;
            box-shadow: 0 8px 28px rgba(240, 140, 46, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-cta:active {
            transform: translateY(0);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-dark);
            color: #cbd5e0;
            padding: 56px 0 28px;
            margin-top: var(--section-gap);
        }
        .site-footer .footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .site-footer .footer-desc {
            font-size: 0.9rem;
            color: #94a3b8;
            line-height: 1.6;
            max-width: 340px;
        }
        .site-footer h6 {
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #fff;
            margin-bottom: 14px;
        }
        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .site-footer .footer-links a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-links a:hover {
            color: #fff;
        }
        .site-footer .footer-bottom {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.82rem;
            color: #64748b;
            text-align: center;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .section {
                padding: var(--section-gap-md) 0;
            }
            .page-banner .banner-title {
                font-size: 2.1rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .stat-card .stat-number {
                font-size: 2rem;
            }
            .cta-section h3 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 768px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
            .page-banner {
                min-height: 260px;
            }
            .page-banner .banner-title {
                font-size: 1.7rem;
            }
            .page-banner .banner-subtitle {
                font-size: 0.95rem;
            }
            .section {
                padding: var(--section-gap-sm) 0;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .card-custom {
                padding: 20px 16px;
            }
            .stat-card .stat-number {
                font-size: 1.8rem;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 8px;
            }
            .btn-nav-cta {
                width: 100%;
                justify-content: center;
                padding: 10px 16px;
            }
            .site-footer .row>div {
                margin-bottom: 20px;
            }
            .cta-section {
                padding: 44px 20px;
                border-radius: var(--radius-lg);
            }
            .cta-section h3 {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 520px) {
            .page-banner {
                min-height: 220px;
            }
            .page-banner .banner-title {
                font-size: 1.4rem;
            }
            .page-banner .banner-content {
                padding: 40px 16px;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .section-desc {
                font-size: 0.95rem;
            }
            .card-image .card-img-top {
                height: 160px;
            }
            .stat-card {
                padding: 18px 10px;
            }
            .stat-card .stat-number {
                font-size: 1.5rem;
            }
            .btn-cta {
                padding: 11px 24px;
                font-size: 0.9rem;
            }
        }

/* roulang page: category5 */
/* ============ 设计变量 ============ */
        :root {
            --color-primary: #1a56db;
            --color-primary-dark: #1347b8;
            --color-primary-light: #e8f0fe;
            --color-accent: #0d9488;
            --color-accent-dark: #0b7d73;
            --color-accent-light: #e6f7f5;
            --color-bg: #f8fafc;
            --color-bg-white: #ffffff;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-weak: #64748b;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1.2);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --section-gap: 80px;
            --section-gap-sm: 50px;
        }

        /* ============ 基础 Reset ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            min-height: 100vh;
        }

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

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

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

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin-top: 0;
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
        }

        p {
            margin-top: 0;
            color: var(--color-text-weak);
        }

        /* ============ 容器 ============ */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 1400px) {
            .container-custom {
                max-width: 1280px;
            }
        }

        /* ============ 导航 Header ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-xs);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .site-header .navbar {
            padding: 0;
            min-height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--color-text) !important;
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 900;
            font-size: 1.05rem;
            flex-shrink: 0;
        }
        .navbar-brand:hover {
            color: var(--color-primary) !important;
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .navbar-nav .nav-link {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text-weak) !important;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .navbar-nav .nav-link:hover {
            color: var(--color-primary) !important;
            background-color: var(--color-primary-light);
        }
        .navbar-nav .nav-link.active {
            color: var(--color-primary) !important;
            background-color: var(--color-primary-light);
            font-weight: 700;
        }
        .navbar-toggler {
            border: none;
            padding: 8px 10px;
            font-size: 1.3rem;
            color: var(--color-text);
            background: transparent;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
            outline: none;
        }
        .navbar-toggler:hover {
            background: var(--color-border-light);
        }
        .nav-cta-wrapper {
            margin-left: 12px;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
            border: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: all var(--transition-base);
            white-space: nowrap;
            letter-spacing: 0.02em;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
        }
        .btn-nav-cta:hover {
            background: linear-gradient(135deg, var(--color-primary-dark) 0%, #1d4ed8 100%);
            box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
            transform: translateY(-2px);
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
        }
        .btn-nav-cta:focus-visible {
            outline: 3px solid rgba(26, 86, 219, 0.5);
            outline-offset: 2px;
        }

        @media (max-width: 991.98px) {
            .navbar-collapse {
                background: #fff;
                border-radius: var(--radius-md);
                padding: 16px;
                margin-top: 8px;
                box-shadow: var(--shadow-md);
                border: 1px solid var(--color-border);
            }
            .navbar-nav {
                gap: 2px;
                margin-bottom: 8px;
            }
            .navbar-nav .nav-link {
                padding: 10px 14px;
                border-radius: var(--radius-sm);
                font-size: 0.95rem;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 6px;
            }
            .btn-nav-cta {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
                font-size: 0.95rem;
            }
        }

        /* ============ 页面 Banner ============ */
        .page-banner {
            position: relative;
            background: linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #1a3a5c 100%);
            background-image: url('assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 80px 0 70px;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.75) 0%, rgba(15, 23, 42, 0.85) 100%);
            z-index: 1;
        }
        .page-banner .container-custom {
            position: relative;
            z-index: 2;
        }
        .page-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #e2e8f0;
            padding: 7px 18px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 22px;
            backdrop-filter: blur(6px);
        }
        .page-banner .banner-badge i {
            color: #60a5fa;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }
        .page-banner .banner-desc {
            font-size: 1.15rem;
            color: #cbd5e1;
            max-width: 640px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .page-banner .banner-search-wrap {
            display: flex;
            max-width: 520px;
            gap: 0;
        }
        .page-banner .banner-search-input {
            flex: 1;
            padding: 14px 20px;
            font-size: 1rem;
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-right: none;
            border-radius: var(--radius-full) 0 0 var(--radius-full);
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            outline: none;
            transition: all var(--transition-base);
            backdrop-filter: blur(4px);
        }
        .page-banner .banner-search-input::placeholder {
            color: #94a3b8;
        }
        .page-banner .banner-search-input:focus {
            border-color: rgba(96, 165, 250, 0.6);
            background: rgba(255, 255, 255, 0.14);
            box-shadow: 0 0 0 6px rgba(96, 165, 250, 0.08);
        }
        .page-banner .banner-search-btn {
            padding: 14px 24px;
            background: var(--color-primary);
            color: #fff;
            border: 2px solid var(--color-primary);
            border-radius: 0 var(--radius-full) var(--radius-full) 0;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .page-banner .banner-search-btn:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
        }
        .page-banner .banner-search-btn:focus-visible {
            outline: 3px solid rgba(96, 165, 250, 0.5);
            outline-offset: 2px;
        }

        @media (max-width: 768px) {
            .page-banner {
                padding: 50px 0 45px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner .banner-desc {
                font-size: 1rem;
            }
            .page-banner .banner-search-wrap {
                flex-direction: column;
                gap: 10px;
                max-width: 100%;
            }
            .page-banner .banner-search-input {
                border-radius: var(--radius-full);
                border-right: 2px solid rgba(255, 255, 255, 0.2);
            }
            .page-banner .banner-search-btn {
                border-radius: var(--radius-full);
                text-align: center;
                justify-content: center;
            }
        }

        /* ============ 板块标题 ============ */
        .section-title-wrap {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title-wrap .section-label {
            display: inline-block;
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 5px 16px;
            border-radius: var(--radius-full);
            margin-bottom: 14px;
        }
        .section-title-wrap h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .section-title-wrap .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-weak);
            max-width: 600px;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .section-title-wrap h2 {
                font-size: 1.7rem;
            }
            .section-title-wrap .section-subtitle {
                font-size: 0.95rem;
            }
        }

        /* ============ 板块间距 ============ */
        .section-py {
            padding: var(--section-gap) 0;
        }
        @media (max-width: 768px) {
            .section-py {
                padding: var(--section-gap-sm) 0;
            }
        }
        .section-py-sm {
            padding: 50px 0;
        }
        @media (max-width: 768px) {
            .section-py-sm {
                padding: 35px 0;
            }
        }

        /* ============ 卡片组件 ============ */
        .guide-card {
            background: var(--color-bg-white);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-base);
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .guide-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-primary) 0%, #60a5fa 100%);
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .guide-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .guide-card:hover::before {
            opacity: 1;
        }
        .guide-card .card-icon-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 18px;
            flex-shrink: 0;
        }
        .guide-card .card-icon-circle.blue {
            background: #eff6ff;
            color: #3b82f6;
        }
        .guide-card .card-icon-circle.teal {
            background: #f0fdfa;
            color: #14b8a6;
        }
        .guide-card .card-icon-circle.amber {
            background: #fffbeb;
            color: #f59e0b;
        }
        .guide-card .card-icon-circle.purple {
            background: #faf5ff;
            color: #8b5cf6;
        }
        .guide-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .guide-card p {
            font-size: 0.95rem;
            color: var(--color-text-weak);
            margin-bottom: 0;
            line-height: 1.65;
        }
        .guide-card .card-step-num {
            position: absolute;
            top: 20px;
            right: 24px;
            font-size: 3.5rem;
            font-weight: 900;
            color: #f1f5f9;
            line-height: 1;
            pointer-events: none;
        }

        /* ============ 功能详解卡片 ============ */
        .feature-detail-card {
            background: var(--color-bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            padding: 36px 30px;
            transition: all var(--transition-base);
            height: 100%;
        }
        .feature-detail-card:hover {
            box-shadow: var(--shadow-md);
            border-color: #cbd5e1;
        }
        .feature-detail-card .feat-icon {
            font-size: 2rem;
            margin-bottom: 16px;
            display: block;
        }
        .feature-detail-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-detail-card p {
            font-size: 0.93rem;
            color: var(--color-text-weak);
            margin-bottom: 16px;
            line-height: 1.65;
        }
        .feature-detail-card .feat-link {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition-fast);
        }
        .feature-detail-card .feat-link:hover {
            gap: 10px;
            color: var(--color-primary-dark);
        }
        .feature-detail-card .feat-link i {
            font-size: 0.75rem;
        }

        /* ============ 步骤列表 ============ */
        .step-list-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 20px 0;
            border-bottom: 1px solid var(--color-border-light);
            transition: background var(--transition-fast);
        }
        .step-list-item:last-child {
            border-bottom: none;
        }
        .step-list-item .step-marker {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
        }
        .step-list-item .step-content h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-list-item .step-content p {
            font-size: 0.93rem;
            color: var(--color-text-weak);
            margin-bottom: 0;
        }

        /* ============ 提示卡片 ============ */
        .tip-card {
            background: #fffbeb;
            border: 1px solid #fde68a;
            border-left: 5px solid #f59e0b;
            border-radius: var(--radius-md);
            padding: 22px 24px;
            display: flex;
            gap: 14px;
            align-items: flex-start;
            transition: all var(--transition-base);
            height: 100%;
        }
        .tip-card .tip-icon {
            font-size: 1.4rem;
            color: #f59e0b;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .tip-card .tip-body h5 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 5px;
            color: #92400e;
        }
        .tip-card .tip-body p {
            font-size: 0.9rem;
            color: #78350f;
            margin-bottom: 0;
            line-height: 1.6;
        }
        .tip-card:hover {
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }
        .tip-card.green-tip {
            background: #f0fdf4;
            border-color: #bbf7d0;
            border-left-color: #10b981;
        }
        .tip-card.green-tip .tip-icon {
            color: #10b981;
        }
        .tip-card.green-tip .tip-body h5 {
            color: #065f46;
        }
        .tip-card.green-tip .tip-body p {
            color: #064e3b;
        }
        .tip-card.blue-tip {
            background: #eff6ff;
            border-color: #bfdbfe;
            border-left-color: #3b82f6;
        }
        .tip-card.blue-tip .tip-icon {
            color: #3b82f6;
        }
        .tip-card.blue-tip .tip-body h5 {
            color: #1e40af;
        }
        .tip-card.blue-tip .tip-body p {
            color: #1e3a8a;
        }

        /* ============ 教程资源卡片 ============ */
        .tutorial-card {
            background: var(--color-bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-base);
            height: 100%;
        }
        .tutorial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .tutorial-card .tutorial-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }
        .tutorial-card .tutorial-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .tutorial-card:hover .tutorial-img-wrap img {
            transform: scale(1.06);
        }
        .tutorial-card .tutorial-img-wrap .play-overlay {
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 0, 0, 0.25);
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .tutorial-card:hover .play-overlay {
            opacity: 1;
        }
        .tutorial-card .play-overlay .play-circle {
            width: 52px;
            height: 52px;
            background: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--color-primary);
            box-shadow: var(--shadow-md);
            transition: transform var(--transition-base);
        }
        .tutorial-card:hover .play-overlay .play-circle {
            transform: scale(1.1);
        }
        .tutorial-card .tutorial-body {
            padding: 20px 22px;
        }
        .tutorial-card .tutorial-body .tutorial-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: var(--color-primary-light);
            color: var(--color-primary);
            margin-bottom: 10px;
            letter-spacing: 0.03em;
        }
        .tutorial-card .tutorial-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .tutorial-card .tutorial-body p {
            font-size: 0.88rem;
            color: var(--color-text-weak);
            margin-bottom: 0;
        }

        /* ============ CTA 板块 ============ */
        .cta-section {
            background: linear-gradient(160deg, #0f172a 0%, #1e3a5f 100%);
            border-radius: var(--radius-xl);
            padding: 56px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 220px;
            height: 220px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: #cbd5e1;
            max-width: 550px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
        }
        .cta-section .btn-cta-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
            background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
            border: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: all var(--transition-base);
            position: relative;
            z-index: 1;
            box-shadow: 0 8px 28px rgba(26, 86, 219, 0.4);
            letter-spacing: 0.02em;
        }
        .btn-cta-lg:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(26, 86, 219, 0.5);
            background: linear-gradient(135deg, var(--color-primary-dark) 0%, #1d4ed8 100%);
        }
        .btn-cta-lg:active {
            transform: translateY(0);
        }
        .btn-cta-lg:focus-visible {
            outline: 3px solid rgba(147, 197, 253, 0.7);
            outline-offset: 3px;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 24px;
                border-radius: var(--radius-lg);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .btn-cta-lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }

        /* ============ 页脚 Footer ============ */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 60px 0 30px;
            margin-top: var(--section-gap);
        }
        .site-footer .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .site-footer .footer-desc {
            font-size: 0.93rem;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 380px;
        }
        .site-footer h6 {
            font-size: 0.85rem;
            font-weight: 700;
            color: #e2e8f0;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 16px;
        }
        .site-footer .footer-links li {
            margin-bottom: 8px;
        }
        .site-footer .footer-links li a {
            font-size: 0.9rem;
            color: #94a3b8;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-links li a:hover {
            color: #fff;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 40px;
            padding-top: 20px;
            font-size: 0.85rem;
            color: #64748b;
            text-align: center;
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 40px 0 25px;
                margin-top: var(--section-gap-sm);
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }

        /* ============ 面包屑 ============ */
        .breadcrumb-row {
            padding: 16px 0;
            font-size: 0.88rem;
            color: var(--color-text-weak);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .breadcrumb-row a {
            color: var(--color-text-weak);
            font-weight: 500;
        }
        .breadcrumb-row a:hover {
            color: var(--color-primary);
        }
        .breadcrumb-row .separator {
            color: #cbd5e1;
            font-size: 0.7rem;
        }
        .breadcrumb-row .current {
            color: var(--color-text);
            font-weight: 600;
        }

        /* ============ 图片圆角统一 ============ */
        .img-rounded {
            border-radius: var(--radius-md);
        }
        .img-rounded-lg {
            border-radius: var(--radius-lg);
        }

        /* ============ 分隔线 ============ */
        .divider-light {
            border-top: 1px solid var(--color-border-light);
            margin: 0;
        }

        /* ============ 辅助类 ============ */
        .text-primary-brand {
            color: var(--color-primary) !important;
        }
        .bg-light-subtle {
            background: #f8fafc;
        }

        /* ============ 响应式通用 ============ */
        @media (max-width: 520px) {
            .guide-card {
                padding: 24px 18px;
            }
            .guide-card .card-step-num {
                font-size: 2.5rem;
                top: 14px;
                right: 16px;
            }
            .feature-detail-card {
                padding: 24px 18px;
            }
            .step-list-item {
                gap: 14px;
                padding: 16px 0;
            }
            .step-list-item .step-marker {
                width: 36px;
                height: 36px;
                font-size: 0.95rem;
            }
            .tutorial-card .tutorial-body {
                padding: 16px;
            }
            .section-title-wrap {
                margin-bottom: 32px;
            }
        }

/* roulang page: category6 */
:root {
            --brand-primary: #1a3350;
            --brand-primary-light: #233f60;
            --brand-accent: #e8943a;
            --brand-accent-hover: #cf7e2d;
            --brand-accent-light: #fdf2e6;
            --brand-bg: #f7f8fa;
            --brand-surface: #ffffff;
            --brand-text: #1d1d1f;
            --brand-text-soft: #5c5c66;
            --brand-text-muted: #8e8e98;
            --brand-border: #e5e6eb;
            --brand-border-light: #f0f1f5;
            --brand-radius-sm: 8px;
            --brand-radius: 12px;
            --brand-radius-lg: 16px;
            --brand-radius-xl: 20px;
            --brand-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --brand-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            --brand-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
            --brand-shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
            --brand-transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --brand-font: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        }

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

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

        body {
            font-family: var(--brand-font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--brand-text);
            background-color: var(--brand-bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: var(--brand-primary);
            transition: color var(--brand-transition);
        }
        a:hover {
            color: var(--brand-accent);
        }

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

        button {
            cursor: pointer;
            font-family: var(--brand-font);
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(26, 51, 80, 0.35);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* Container */
        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--brand-border);
            box-shadow: var(--brand-shadow-sm);
            transition: box-shadow var(--brand-transition);
        }
        .site-header.scrolled {
            box-shadow: var(--brand-shadow);
        }
        .site-header .navbar {
            padding: 0;
            min-height: 60px;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--brand-primary) !important;
            letter-spacing: -0.3px;
            transition: opacity var(--brand-transition);
            white-space: nowrap;
        }
        .navbar-brand:hover {
            opacity: 0.85;
            color: var(--brand-primary) !important;
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--brand-primary);
            color: #fff;
            border-radius: 10px;
            font-weight: 800;
            font-size: 1.1rem;
            letter-spacing: 0;
            flex-shrink: 0;
        }
        .navbar-nav {
            gap: 2px;
        }
        .nav-link {
            font-size: 0.93rem;
            font-weight: 500;
            color: var(--brand-text-soft) !important;
            padding: 8px 15px !important;
            border-radius: 8px;
            transition: all var(--brand-transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--brand-primary) !important;
            background: rgba(26, 51, 80, 0.04);
        }
        .nav-link.active {
            color: var(--brand-accent) !important;
            background: var(--brand-accent-light);
            font-weight: 600;
        }
        .navbar-toggler {
            border: none;
            background: transparent;
            color: var(--brand-primary);
            font-size: 1.4rem;
            padding: 6px 10px;
            border-radius: 8px;
            transition: background var(--brand-transition);
        }
        .navbar-toggler:hover {
            background: rgba(26, 51, 80, 0.06);
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 3px solid rgba(26, 51, 80, 0.3);
            outline-offset: 2px;
        }
        .nav-cta-wrapper {
            margin-left: 12px;
        }
        .btn-nav-cta {
            background: var(--brand-accent);
            color: #fff;
            border: none;
            padding: 9px 22px;
            border-radius: 22px;
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
            transition: all var(--brand-transition);
            box-shadow: 0 2px 8px rgba(232, 148, 58, 0.3);
        }
        .btn-nav-cta:hover {
            background: var(--brand-accent-hover);
            box-shadow: 0 4px 16px rgba(232, 148, 58, 0.4);
            transform: translateY(-1px);
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 6px rgba(232, 148, 58, 0.25);
        }
        @media (max-width: 991.98px) {
            .navbar-collapse {
                background: #fff;
                border-radius: var(--brand-radius);
                padding: 16px;
                margin-top: 8px;
                box-shadow: var(--brand-shadow-lg);
                border: 1px solid var(--brand-border);
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 10px;
            }
            .btn-nav-cta {
                width: 100%;
                text-align: center;
            }
            .navbar-nav {
                gap: 1px;
            }
        }

        /* ========== SECTION SPACING ========== */
        .section-py {
            padding-top: 60px;
            padding-bottom: 60px;
        }
        .section-py-lg {
            padding-top: 80px;
            padding-bottom: 80px;
        }
        .section-py-sm {
            padding-top: 40px;
            padding-bottom: 40px;
        }
        @media (max-width: 768px) {
            .section-py {
                padding-top: 40px;
                padding-bottom: 40px;
            }
            .section-py-lg {
                padding-top: 50px;
                padding-bottom: 50px;
            }
        }

        /* ========== FAQ BANNER ========== */
        .faq-banner {
            position: relative;
            background: linear-gradient(160deg, #1a3350 0%, #233f60 40%, #1e3858 100%);
            color: #fff;
            padding: 70px 0 60px;
            overflow: hidden;
            z-index: 1;
        }
        .faq-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            z-index: -1;
        }
        .faq-banner::after {
            content: '';
            position: absolute;
            bottom: -40px;
            right: -60px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(232, 148, 58, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            z-index: -1;
            pointer-events: none;
        }
        .faq-banner .badge-faq {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
            backdrop-filter: blur(4px);
        }
        .faq-banner h1 {
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            line-height: 1.25;
        }
        .faq-banner .banner-desc {
            font-size: 1.05rem;
            opacity: 0.9;
            max-width: 600px;
            margin-bottom: 28px;
            line-height: 1.6;
        }
        .faq-search-wrap {
            position: relative;
            max-width: 560px;
        }
        .faq-search-wrap .form-control {
            height: 52px;
            border-radius: 28px;
            padding: 0 120px 0 24px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            font-size: 1rem;
            backdrop-filter: blur(6px);
            transition: all var(--brand-transition);
        }
        .faq-search-wrap .form-control::placeholder {
            color: rgba(255, 255, 255, 0.6);
        }
        .faq-search-wrap .form-control:focus {
            outline: none;
            border-color: var(--brand-accent);
            background: rgba(255, 255, 255, 0.2);
            box-shadow: 0 0 0 8px rgba(232, 148, 58, 0.12);
        }
        .faq-search-wrap .btn-search {
            position: absolute;
            right: 6px;
            top: 6px;
            height: 40px;
            width: 40px;
            border-radius: 50%;
            background: var(--brand-accent);
            color: #fff;
            border: none;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--brand-transition);
            box-shadow: 0 2px 10px rgba(232, 148, 58, 0.35);
        }
        .faq-search-wrap .btn-search:hover {
            background: var(--brand-accent-hover);
            box-shadow: 0 4px 18px rgba(232, 148, 58, 0.5);
            transform: scale(1.04);
        }
        @media (max-width: 768px) {
            .faq-banner {
                padding: 48px 0 40px;
            }
            .faq-banner h1 {
                font-size: 1.9rem;
            }
            .faq-banner .banner-desc {
                font-size: 0.95rem;
            }
            .faq-search-wrap .form-control {
                height: 46px;
                font-size: 0.9rem;
                padding-right: 100px;
            }
            .faq-search-wrap .btn-search {
                height: 34px;
                width: 34px;
                top: 6px;
                right: 6px;
                font-size: 0.85rem;
            }
        }

        /* ========== FILTER TAGS ========== */
        .filter-tags-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            padding: 24px 0 8px;
        }
        .filter-tag {
            display: inline-block;
            padding: 8px 20px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            border: 1.5px solid var(--brand-border);
            background: #fff;
            color: var(--brand-text-soft);
            transition: all var(--brand-transition);
            user-select: none;
            white-space: nowrap;
        }
        .filter-tag:hover {
            border-color: var(--brand-accent);
            color: var(--brand-accent);
            background: var(--brand-accent-light);
        }
        .filter-tag.active {
            background: var(--brand-accent);
            color: #fff;
            border-color: var(--brand-accent);
            font-weight: 600;
            box-shadow: 0 2px 10px rgba(232, 148, 58, 0.3);
        }

        /* ========== FAQ ACCORDION ========== */
        .faq-accordion-section {
            background: #fff;
            border-radius: var(--brand-radius-lg);
            box-shadow: var(--brand-shadow);
            padding: 32px 28px;
            margin-top: 16px;
        }
        .accordion-faq .accordion-item {
            border: none;
            border-bottom: 1px solid var(--brand-border-light);
            background: transparent;
            margin-bottom: 0;
            border-radius: 0;
        }
        .accordion-faq .accordion-item:last-child {
            border-bottom: none;
        }
        .accordion-faq .accordion-header {
            margin: 0;
        }
        .accordion-faq .accordion-button {
            font-size: 1.02rem;
            font-weight: 600;
            color: var(--brand-text);
            background: transparent;
            padding: 18px 20px 18px 8px;
            border: none;
            box-shadow: none;
            border-radius: 0;
            transition: all var(--brand-transition);
            display: flex;
            align-items: center;
            gap: 12px;
            text-align: left;
        }
        .accordion-faq .accordion-button::after {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            background-size: 20px;
            transition: transform var(--brand-transition);
            filter: brightness(0) saturate(100%) invert(55%) sepia(0) saturate(0%) hue-rotate(0deg);
        }
        .accordion-faq .accordion-button:not(.collapsed) {
            color: var(--brand-accent);
            background: var(--brand-accent-light);
            border-radius: var(--brand-radius-sm);
            box-shadow: none;
        }
        .accordion-faq .accordion-button:not(.collapsed)::after {
            filter: brightness(0) saturate(100%) invert(60%) sepia(80%) saturate(1200%) hue-rotate(355deg);
        }
        .accordion-faq .accordion-button:hover {
            background: rgba(26, 51, 80, 0.025);
            color: var(--brand-primary);
            border-radius: var(--brand-radius-sm);
        }
        .accordion-faq .accordion-button:focus {
            box-shadow: none;
            outline: 3px solid rgba(26, 51, 80, 0.25);
            outline-offset: -1px;
            border-radius: var(--brand-radius-sm);
        }
        .faq-q-icon {
            flex-shrink: 0;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: var(--brand-accent-light);
            color: var(--brand-accent);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            transition: all var(--brand-transition);
        }
        .accordion-button:not(.collapsed) .faq-q-icon {
            background: var(--brand-accent);
            color: #fff;
        }
        .accordion-faq .accordion-body {
            padding: 6px 20px 22px 54px;
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--brand-text-soft);
        }
        .accordion-faq .accordion-collapse {
            transition: all 0.3s ease;
        }
        @media (max-width: 768px) {
            .faq-accordion-section {
                padding: 20px 14px;
            }
            .accordion-faq .accordion-button {
                font-size: 0.93rem;
                padding: 15px 10px 15px 4px;
                gap: 8px;
            }
            .accordion-faq .accordion-body {
                padding: 4px 10px 18px 42px;
                font-size: 0.88rem;
            }
            .faq-q-icon {
                width: 28px;
                height: 28px;
                font-size: 0.75rem;
            }
        }

        /* No results */
        .no-results {
            display: none;
            text-align: center;
            padding: 40px 20px;
            color: var(--brand-text-muted);
        }
        .no-results.show {
            display: block;
        }
        .no-results i {
            font-size: 2.5rem;
            display: block;
            margin-bottom: 12px;
            color: var(--brand-border);
        }

        /* ========== HOT QUESTIONS CARDS ========== */
        .hot-questions-section .section-title-sm {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--brand-primary);
            text-align: center;
            margin-bottom: 8px;
            letter-spacing: -0.3px;
        }
        .hot-questions-section .section-subtitle {
            text-align: center;
            color: var(--brand-text-muted);
            font-size: 0.95rem;
            margin-bottom: 32px;
        }
        .hot-card {
            background: #fff;
            border-radius: var(--brand-radius);
            padding: 22px 20px;
            border: 1px solid var(--brand-border);
            box-shadow: var(--brand-shadow-sm);
            transition: all var(--brand-transition);
            cursor: pointer;
            display: flex;
            align-items: flex-start;
            gap: 14px;
            height: 100%;
            text-decoration: none;
            color: var(--brand-text);
        }
        .hot-card:hover {
            box-shadow: var(--brand-shadow-lg);
            border-color: var(--brand-accent);
            transform: translateY(-2px);
            color: var(--brand-text);
        }
        .hot-card .hot-card-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--brand-accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-accent);
            font-size: 1.15rem;
            transition: all var(--brand-transition);
        }
        .hot-card:hover .hot-card-icon {
            background: var(--brand-accent);
            color: #fff;
            transform: scale(1.05);
        }
        .hot-card .hot-card-text {
            flex: 1;
        }
        .hot-card .hot-card-title {
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            margin-bottom: 4px;
            color: var(--brand-text);
        }
        .hot-card .hot-card-meta {
            font-size: 0.8rem;
            color: var(--brand-text-muted);
        }
        @media (max-width: 768px) {
            .hot-card {
                padding: 16px 14px;
                gap: 10px;
            }
            .hot-card .hot-card-icon {
                width: 36px;
                height: 36px;
                font-size: 1rem;
                border-radius: 10px;
            }
            .hot-card .hot-card-title {
                font-size: 0.88rem;
            }
        }

        /* ========== STATS STRIP ========== */
        .stats-strip {
            background: var(--brand-primary);
            color: #fff;
            padding: 36px 0;
            position: relative;
            overflow: hidden;
        }
        .stats-strip::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            pointer-events: none;
        }
        .stat-item {
            text-align: center;
            padding: 12px 8px;
            position: relative;
            z-index: 1;
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--brand-accent);
            line-height: 1.1;
            margin-bottom: 4px;
        }
        .stat-label {
            font-size: 0.9rem;
            opacity: 0.85;
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .stat-number {
                font-size: 1.8rem;
            }
            .stat-label {
                font-size: 0.8rem;
            }
            .stats-strip {
                padding: 24px 0;
            }
        }

        /* ========== CTA SECTION ========== */
        .cta-section-inner {
            background: linear-gradient(135deg, #1a3350 0%, #233f60 100%);
            border-radius: var(--brand-radius-xl);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section-inner::after {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 280px;
            height: 280px;
            background: radial-gradient(circle, rgba(232, 148, 58, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section-inner h3 {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }
        .cta-section-inner p {
            font-size: 1rem;
            opacity: 0.9;
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-cta-primary {
            display: inline-block;
            background: var(--brand-accent);
            color: #fff;
            padding: 12px 36px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            transition: all var(--brand-transition);
            box-shadow: 0 4px 18px rgba(232, 148, 58, 0.4);
            position: relative;
            z-index: 1;
            cursor: pointer;
        }
        .btn-cta-primary:hover {
            background: #fff;
            color: var(--brand-primary);
            box-shadow: 0 6px 24px rgba(232, 148, 58, 0.5);
            transform: translateY(-2px);
        }
        .btn-cta-primary:active {
            transform: translateY(0);
            box-shadow: 0 3px 12px rgba(232, 148, 58, 0.35);
        }
        @media (max-width: 768px) {
            .cta-section-inner {
                padding: 32px 20px;
                border-radius: var(--brand-radius-lg);
            }
            .cta-section-inner h3 {
                font-size: 1.35rem;
            }
            .btn-cta-primary {
                padding: 10px 28px;
                font-size: 0.9rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #1a1d23;
            color: #c5c6cc;
            padding: 48px 0 0;
            font-size: 0.9rem;
        }
        .site-footer .footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .site-footer .footer-desc {
            font-size: 0.88rem;
            line-height: 1.7;
            color: #9a9ca3;
            max-width: 360px;
        }
        .site-footer h6 {
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links li a {
            color: #9a9ca3;
            font-size: 0.88rem;
            transition: color var(--brand-transition);
        }
        .footer-links li a:hover {
            color: var(--brand-accent);
        }
        .footer-bottom {
            margin-top: 36px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 0.82rem;
            color: #70737a;
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 32px 0 0;
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }

        /* ========== UTILITY ANIMATIONS ========== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .anim-fade-in {
            animation: fadeInUp 0.6s ease forwards;
        }

        /* Section dividers */
        .section-divider {
            height: 1px;
            background: var(--brand-border);
            margin: 0;
            opacity: 0.6;
        }

        /* Back to top */
        .btn-back-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            z-index: 999;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--brand-primary);
            color: #fff;
            border: none;
            font-size: 1.1rem;
            box-shadow: var(--brand-shadow-lg);
            transition: all var(--brand-transition);
            opacity: 0;
            pointer-events: none;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .btn-back-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .btn-back-top:hover {
            background: var(--brand-accent);
            transform: translateY(-3px);
            box-shadow: var(--brand-shadow-xl);
        }

/* roulang page: category3 */
:root {
            --brand-primary: #1a56db;
            --brand-primary-dark: #1240a8;
            --brand-primary-light: #e8f0fe;
            --brand-accent: #f59e0b;
            --brand-accent-dark: #d97706;
            --brand-secondary: #0f172a;
            --brand-surface: #ffffff;
            --brand-bg: #f8fafc;
            --brand-bg-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-default: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
            --shadow-xl: 0 20px 60px rgba(15, 23, 42, 0.16);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, sans-serif;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', -apple-system, sans-serif;
            --section-gap: 80px;
            --section-gap-sm: 48px;
        }

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

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

        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--brand-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--brand-primary);
        }

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

        button {
            cursor: pointer;
            font-family: var(--font-body);
        }

        ::selection {
            background: var(--brand-primary);
            color: #fff;
        }

        .container-custom {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ========== HEADER ========== */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-default);
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .site-header .navbar {
            padding: 12px 0;
            align-items: center;
        }
        .navbar-brand {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--brand-secondary) !important;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.01em;
            transition: color var(--transition-fast);
        }
        .navbar-brand:hover {
            color: var(--brand-primary) !important;
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--brand-primary) 0%, #3b82f6 100%);
            color: #fff;
            font-weight: 800;
            font-size: 1.05rem;
            letter-spacing: -0.02em;
            flex-shrink: 0;
        }
        .navbar-nav {
            gap: 4px;
            margin-left: 28px;
        }
        .nav-link {
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-secondary) !important;
            padding: 8px 16px !important;
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--brand-primary) !important;
            background: var(--brand-primary-light);
        }
        .nav-link.active {
            color: #fff !important;
            background: var(--brand-primary) !important;
            font-weight: 600;
            border-radius: var(--radius-full);
        }
        .nav-cta-wrapper {
            margin-left: 16px;
        }
        .btn-nav-cta {
            background: var(--brand-accent);
            color: #0f172a;
            border: none;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-nav-cta:hover {
            background: var(--brand-accent-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }
        .navbar-toggler {
            border: none;
            padding: 8px 10px;
            color: var(--text-primary);
            font-size: 1.3rem;
            box-shadow: none;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
            outline: none;
        }

        @media (max-width: 991.98px) {
            .navbar-nav {
                margin-left: 0;
                gap: 2px;
                padding: 12px 0;
            }
            .nav-link {
                border-radius: var(--radius-sm);
                padding: 10px 14px !important;
            }
            .nav-cta-wrapper {
                margin-left: 0;
                margin-top: 8px;
                padding: 4px 0 8px;
            }
            .btn-nav-cta {
                width: 100%;
                text-align: center;
            }
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            position: relative;
            background: url('assets/images/backpic/back-2.webp') center/cover no-repeat;
            min-height: 340px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.82) 0%, rgba(26, 86, 219, 0.65) 55%, rgba(15, 23, 42, 0.7) 100%);
            z-index: 1;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 2;
            color: #fff;
            padding: 60px 0;
        }
        .page-banner .banner-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.18);
            backdrop-filter: blur(6px);
            color: #fff;
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .page-banner h1 {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            line-height: 1.25;
        }
        .page-banner .banner-desc {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 620px;
            line-height: 1.7;
        }
        .banner-stats-row {
            display: flex;
            gap: 32px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .banner-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.9);
        }
        .banner-stat-item i {
            color: var(--brand-accent);
            font-size: 1.1rem;
        }
        .banner-stat-item strong {
            color: #fff;
            font-weight: 700;
            font-size: 1.15rem;
        }
        @media (max-width: 768px) {
            .page-banner {
                min-height: 260px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner .banner-desc {
                font-size: 0.95rem;
            }
            .banner-stats-row {
                gap: 16px;
            }
        }

        /* ========== SECTION TITLES ========== */
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-label {
            display: inline-block;
            background: var(--brand-primary-light);
            color: var(--brand-primary);
            padding: 5px 16px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-family: var(--font-heading);
            font-size: 2.1rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            margin-bottom: 8px;
        }
        .section-header .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 560px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-header h2 {
                font-size: 1.55rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ========== CATEGORY TAGS ========== */
        .category-tags-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            padding: 28px 0;
            border-bottom: 1px solid var(--border-default);
            margin-bottom: 40px;
        }
        .cat-tag {
            display: inline-block;
            padding: 8px 20px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: #fff;
            border: 1px solid var(--border-default);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .cat-tag:hover {
            color: var(--brand-primary);
            border-color: var(--brand-primary);
            background: var(--brand-primary-light);
        }
        .cat-tag.active {
            background: var(--brand-primary);
            color: #fff;
            border-color: var(--brand-primary);
            font-weight: 600;
        }

        /* ========== NEWS LIST ========== */
        .news-list-section {
            padding: 0 0 var(--section-gap);
        }
        .news-card {
            background: #fff;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-default);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .news-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-default);
        }
        .news-card-img-wrapper {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            flex-shrink: 0;
        }
        .news-card-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .news-card:hover .news-card-img-wrapper img {
            transform: scale(1.06);
        }
        .news-card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--brand-accent);
            color: #0f172a;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
            z-index: 2;
        }
        .news-card-body {
            padding: 20px 22px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .news-card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .news-card-meta i {
            font-size: 0.75rem;
        }
        .news-card-title {
            font-family: var(--font-heading);
            font-size: 1.08rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.45;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card-title a {
            color: inherit;
        }
        .news-card-title a:hover {
            color: var(--brand-primary);
        }
        .news-card-excerpt {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }
        .news-card-link {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--brand-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition-fast);
            align-self: flex-start;
        }
        .news-card-link:hover {
            gap: 10px;
            color: var(--brand-primary-dark);
        }
        .news-card-link i {
            font-size: 0.8rem;
            transition: transform var(--transition-fast);
        }
        .news-card-link:hover i {
            transform: translateX(3px);
        }

        /* Featured news card - horizontal */
        .news-card-featured {
            flex-direction: row;
        }
        .news-card-featured .news-card-img-wrapper {
            width: 44%;
            aspect-ratio: auto;
            min-height: 280px;
        }
        .news-card-featured .news-card-body {
            width: 56%;
            padding: 28px 28px 28px;
        }
        .news-card-featured .news-card-title {
            font-size: 1.35rem;
            -webkit-line-clamp: 3;
        }
        @media (max-width: 767.98px) {
            .news-card-featured {
                flex-direction: column;
            }
            .news-card-featured .news-card-img-wrapper {
                width: 100%;
                aspect-ratio: 16 / 10;
                min-height: auto;
            }
            .news-card-featured .news-card-body {
                width: 100%;
                padding: 18px 18px 22px;
            }
            .news-card-featured .news-card-title {
                font-size: 1.1rem;
            }
        }

        /* ========== HOT TOPICS ========== */
        .hot-topics-section {
            padding: var(--section-gap) 0;
            background: #fff;
            border-top: 1px solid var(--border-default);
            border-bottom: 1px solid var(--border-default);
        }
        .topic-card {
            background: var(--brand-bg);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--border-default);
            transition: all var(--transition-base);
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .topic-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--brand-primary);
            transform: translateY(-2px);
        }
        .topic-card .topic-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-sm);
            background: var(--brand-primary-light);
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 16px;
            flex-shrink: 0;
        }
        .topic-card h4 {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .topic-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 14px;
            line-height: 1.6;
        }
        .topic-card .topic-link {
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--brand-primary);
        }
        .topic-card .topic-count {
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 3.5rem;
            font-weight: 800;
            color: rgba(26, 86, 219, 0.06);
            pointer-events: none;
            line-height: 1;
        }

        /* ========== SUBSCRIBE CTA ========== */
        .subscribe-cta-section {
            padding: var(--section-gap) 0;
            background: linear-gradient(135deg, var(--brand-secondary) 0%, #1e3a5f 60%, var(--brand-primary-dark) 100%);
            color: #fff;
        }
        .subscribe-cta-inner {
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .subscribe-cta-inner h2 {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 2rem;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .subscribe-cta-inner p {
            font-size: 1rem;
            opacity: 0.85;
            margin-bottom: 28px;
            line-height: 1.6;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
            max-width: 500px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .subscribe-form input {
            flex: 1;
            min-width: 220px;
            padding: 13px 20px;
            border-radius: var(--radius-full);
            border: 2px solid transparent;
            font-size: 0.95rem;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            outline: none;
            transition: all var(--transition-fast);
            backdrop-filter: blur(4px);
        }
        .subscribe-form input::placeholder {
            color: rgba(255, 255, 255, 0.55);
        }
        .subscribe-form input:focus {
            border-color: var(--brand-accent);
            background: rgba(255, 255, 255, 0.2);
            box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
        }
        .subscribe-form .btn-subscribe {
            padding: 13px 28px;
            border-radius: var(--radius-full);
            background: var(--brand-accent);
            color: #0f172a;
            font-weight: 700;
            font-size: 0.95rem;
            border: none;
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .subscribe-form .btn-subscribe:hover {
            background: #fbbf24;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
        }

        /* ========== FAQ ========== */
        .faq-section {
            padding: var(--section-gap) 0;
            background: var(--brand-bg);
        }
        .faq-accordion .accordion-item {
            border: 1px solid var(--border-default);
            border-radius: var(--radius-md) !important;
            margin-bottom: 10px;
            overflow: hidden;
            background: #fff;
            box-shadow: var(--shadow-sm);
        }
        .faq-accordion .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            padding: 18px 22px;
            background: #fff;
            box-shadow: none;
            border-radius: var(--radius-md) !important;
            transition: all var(--transition-fast);
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--brand-primary);
            background: var(--brand-primary-light);
            box-shadow: none;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
            border-color: var(--brand-primary);
        }
        .faq-accordion .accordion-body {
            padding: 16px 22px 22px;
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--brand-secondary);
            color: #cbd5e1;
            padding: 56px 0 24px;
            font-size: 0.9rem;
        }
        .footer-brand {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-desc {
            color: #94a3b8;
            line-height: 1.7;
            max-width: 380px;
        }
        .site-footer h6 {
            color: #fff;
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links a {
            color: #94a3b8;
            transition: color var(--transition-fast);
            font-size: 0.88rem;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            color: #64748b;
            font-size: 0.84rem;
        }

        /* ========== PAGINATION ========== */
        .pagination-wrapper {
            display: flex;
            justify-content: center;
            margin-top: 40px;
        }
        .pagination-custom {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .pagination-custom .page-item-custom {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            background: #fff;
            border: 1px solid var(--border-default);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .pagination-custom .page-item-custom:hover {
            border-color: var(--brand-primary);
            color: var(--brand-primary);
            background: var(--brand-primary-light);
        }
        .pagination-custom .page-item-custom.active {
            background: var(--brand-primary);
            color: #fff;
            border-color: var(--brand-primary);
        }
        .pagination-custom .page-item-custom.disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* ========== RESPONSIVE GENERAL ========== */
        @media (max-width: 1024px) {
            :root {
                --section-gap: 56px;
                --section-gap-sm: 36px;
            }
            .page-banner h1 {
                font-size: 2.1rem;
            }
        }
        @media (max-width: 520px) {
            :root {
                --section-gap: 40px;
                --section-gap-sm: 28px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .banner-desc {
                font-size: 0.88rem;
            }
            .news-card-body {
                padding: 14px 14px 18px;
            }
            .news-card-title {
                font-size: 0.95rem;
            }
            .subscribe-cta-inner h2 {
                font-size: 1.45rem;
            }
            .subscribe-form {
                flex-direction: column;
                gap: 10px;
            }
            .subscribe-form input {
                width: 100%;
            }
            .subscribe-form .btn-subscribe {
                width: 100%;
            }
            .cat-tag {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
        }