/* roulang page: index */
:root {
            --primary: #1a3a5c;
            --primary-dark: #101f30;
            --primary-light: #e8eef4;
            --accent: #c8963e;
            --accent-dark: #a8782f;
            --accent-light: #f5ead9;
            --dark: #0e1a26;
            --body-bg: #f8f6f3;
            --card-bg: #ffffff;
            --text: #1f2a37;
            --text-muted: #6b7280;
            --border: #e5e0da;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 28px;
            --shadow-sm: 0 2px 16px rgba(14, 26, 38, 0.06);
            --shadow: 0 6px 32px rgba(14, 26, 38, 0.09);
            --shadow-lg: 0 20px 60px rgba(14, 26, 38, 0.14);
            --transition: all .35s cubic-bezier(.4, 0, .2, 1);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--body-bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section {
            padding: 96px 0;
        }
        @media (max-width: 991.98px) {
            .section {
                padding: 72px 0;
            }
        }
        @media (max-width: 575.98px) {
            .section {
                padding: 52px 0;
            }
        }

        /* ========== Header & Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
        }
        .main-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
            gap: 20px;
            position: relative;
        }
        .nav-group {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
        }
        .nav-group.left {
            justify-content: flex-start;
        }
        .nav-group.right {
            justify-content: flex-end;
        }
        .nav-link {
            padding: 8px 20px;
            border-radius: 100px;
            color: var(--text);
            font-weight: 500;
            font-size: 15px;
            transition: var(--transition);
            white-space: nowrap;
            display: inline-block;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .brand-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: .5px;
            text-align: center;
            white-space: nowrap;
            line-height: 1.3;
            padding: 0 10px;
            flex-shrink: 0;
        }
        .brand-logo small {
            display: block;
            font-size: 10px;
            letter-spacing: 5px;
            color: var(--accent);
            font-weight: 600;
            text-transform: uppercase;
            margin-top: 2px;
        }
        .nav-cta {
            padding: 10px 26px;
            border-radius: 100px;
            background: var(--accent);
            color: #fff !important;
            font-weight: 600;
            font-size: 14px;
            border: none;
            transition: var(--transition);
            white-space: nowrap;
            box-shadow: 0 2px 12px rgba(200, 150, 62, .25);
        }
        .nav-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(200, 150, 62, .35);
        }
        .navbar-toggler-custom {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--primary);
            line-height: 1;
            padding: 6px 12px;
            border-radius: 8px;
            cursor: pointer;
        }
        .navbar-toggler-custom:hover {
            background: var(--primary-light);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            right: -320px;
            width: 280px;
            height: 100vh;
            background: #fff;
            z-index: 2000;
            box-shadow: -8px 0 40px rgba(0, 0, 0, .12);
            padding: 30px 28px;
            transition: right .4s ease;
            overflow-y: auto;
        }
        .mobile-menu.open {
            right: 0;
        }
        .mobile-menu-backdrop {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, .4);
            z-index: 1999;
            opacity: 0;
            transition: opacity .35s ease;
        }
        .mobile-menu-backdrop.show {
            display: block;
            opacity: 1;
        }
        .mobile-menu .mobile-menu-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 28px;
            padding-bottom: 18px;
            border-bottom: 1px solid var(--border);
        }
        .mobile-menu .mobile-menu-close {
            border: none;
            background: var(--body-bg);
            width: 38px;
            height: 38px;
            border-radius: 50%;
            font-size: 1.1rem;
            color: var(--text);
            cursor: pointer;
        }
        .mobile-menu-link {
            display: block;
            padding: 14px 16px;
            border-radius: 12px;
            color: var(--text);
            font-weight: 500;
            margin-bottom: 6px;
            font-size: 16px;
        }
        .mobile-menu-link:hover,
        .mobile-menu-link.active {
            background: var(--primary-light);
            color: var(--primary);
        }
        @media (max-width: 991.98px) {
            .main-nav {
                height: 68px;
            }
            .nav-group .nav-link,
            .nav-group .nav-cta {
                display: none;
            }
            .navbar-toggler-custom {
                display: block;
            }
            .brand-logo {
                font-size: 18px;
            }
            .brand-logo small {
                letter-spacing: 3px;
                font-size: 9px;
            }
        }
        @media (max-width: 575.98px) {
            .brand-logo {
                font-size: 16px;
                padding: 0 4px;
            }
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 680px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            padding: 140px 0 110px;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8, 16, 28, .72) 0%, rgba(14, 26, 38, .48) 50%, rgba(8, 16, 28, .76) 100%);
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--body-bg), transparent);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, .15);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, .25);
            border-radius: 100px;
            padding: 8px 22px;
            color: #fff;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 1px;
            margin-bottom: 28px;
        }
        .hero-badge i {
            color: var(--accent);
        }
        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 24px;
            letter-spacing: 1px;
        }
        .hero-desc {
            font-size: 18px;
            color: rgba(255, 255, 255, .9);
            line-height: 1.8;
            margin-bottom: 40px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-hero {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 15px 36px;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            border: none;
            transition: var(--transition);
        }
        .btn-hero-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 8px 30px rgba(200, 150, 62, .4);
        }
        .btn-hero-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(200, 150, 62, .5);
        }
        .btn-hero-outline {
            background: rgba(255, 255, 255, .1);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, .4);
            backdrop-filter: blur(8px);
        }
        .btn-hero-outline:hover {
            background: rgba(255, 255, 255, .2);
            transform: translateY(-2px);
        }
        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .hero-meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, .75);
            font-size: 13px;
        }
        .hero-meta-item i {
            color: var(--accent);
        }
        @media (max-width: 767.98px) {
            .hero {
                min-height: auto;
                padding: 100px 0 80px;
            }
            .hero h1 {
                font-size: 32px;
            }
            .hero-desc {
                font-size: 15px;
            }
            .hero-btns {
                flex-direction: column;
                align-items: center;
            }
            .btn-hero {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
            .hero-meta {
                gap: 16px;
            }
        }

        /* ========== Stats Bar ========== */
        .stats-section {
            padding: 0;
            margin-top: -40px;
            position: relative;
            z-index: 3;
        }
        .stats-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 40px 32px;
            border: 1px solid rgba(229, 224, 218, .6);
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .stats-item {
            text-align: center;
            padding: 8px;
            position: relative;
        }
        .stats-item:not(:last-child)::after {
            content: '';
            position: absolute;
            right: -16px;
            top: 50%;
            transform: translateY(-50%);
            width: 1px;
            height: 52px;
            background: var(--border);
        }
        .stats-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .stats-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 6px;
        }
        @media (max-width: 991.98px) {
            .stats-card {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stats-item:not(:last-child)::after {
                display: none;
            }
        }
        @media (max-width: 575.98px) {
            .stats-card {
                grid-template-columns: 1fr;
                gap: 18px;
                padding: 28px 20px;
            }
            .stats-num {
                font-size: 28px;
            }
        }

        /* ========== Section Header ========== */
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }
        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
        }
        .section-head h2 {
            font-size: 38px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .section-head p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
        }
        @media (max-width: 767.98px) {
            .section-head {
                margin-bottom: 36px;
            }
            .section-head h2 {
                font-size: 28px;
            }
            .section-head p {
                font-size: 14px;
            }
        }

        /* ========== Intro Block ========== */
        .intro-section {
            background: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }
        .intro-media {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-media img {
            width: 100%;
            height: 460px;
            object-fit: cover;
            display: block;
            transition: transform .6s ease;
        }
        .intro-media:hover img {
            transform: scale(1.03);
        }
        .intro-media-tag {
            position: absolute;
            top: 20px;
            left: 20px;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(8px);
            border-radius: 100px;
            padding: 7px 18px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .intro-content .section-eyebrow {
            margin-bottom: 12px;
        }
        .intro-content h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 20px;
        }
        .intro-content p {
            color: var(--text-muted);
            font-size: 16px;
            line-height: 1.9;
            margin-bottom: 24px;
        }
        .intro-list {
            list-style: none;
            padding: 0;
            margin: 0 0 32px;
        }
        .intro-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px dashed var(--border);
            font-size: 15px;
            color: var(--text);
        }
        .intro-list li:last-child {
            border-bottom: none;
        }
        .intro-list li i {
            color: var(--accent);
            font-size: 18px;
            margin-top: 2px;
            flex-shrink: 0;
        }
        @media (max-width: 991.98px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .intro-media img {
                height: 340px;
            }
            .intro-content h2 {
                font-size: 28px;
            }
        }

        /* ========== Category Cards ========== */
        .category-section {
            background: var(--body-bg);
        }
        .category-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }
        .category-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card-media {
            position: relative;
            overflow: hidden;
            height: 240px;
        }
        .category-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .6s ease;
        }
        .category-card:hover .category-card-media img {
            transform: scale(1.05);
        }
        .category-card-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 18, 30, .55), transparent);
        }
        .category-card-body {
            padding: 32px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card-body h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .category-card-body p {
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.8;
            flex: 1;
            margin-bottom: 20px;
        }
        .category-card-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
        }
        .category-card-link:hover {
            color: var(--accent);
            gap: 12px;
        }
        @media (max-width: 991.98px) {
            .category-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .category-card-media {
                height: 200px;
            }
        }

        /* ========== News / Articles ========== */
        .news-section {
            background: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .news-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 60px;
            align-items: start;
        }
        .news-feature {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }
        .news-feature img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            display: block;
        }
        .news-feature-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 40px 32px 32px;
            background: linear-gradient(to top, rgba(8, 16, 28, .82), transparent);
            color: #fff;
        }
        .news-feature-content .badge-custom {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 5px 14px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .news-feature-content h3 {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 8px;
        }
        .news-feature-content p {
            font-size: 14px;
            opacity: .85;
            margin-bottom: 12px;
        }
        .news-feature-content .news-meta {
            font-size: 13px;
            opacity: .7;
        }
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 22px 8px;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
            border-radius: 8px;
        }
        .news-item:hover {
            background: var(--primary-light);
            padding-left: 16px;
            padding-right: 16px;
        }
        .news-item:last-child {
            border-bottom: none;
        }
        .news-item-badge {
            flex-shrink: 0;
            background: var(--accent-light);
            color: var(--accent-dark);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 100px;
            white-space: nowrap;
        }
        .news-item-title {
            flex: 1;
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            line-height: 1.5;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
        }
        .news-item-date {
            flex-shrink: 0;
            font-size: 13px;
            color: var(--text-light);
            white-space: nowrap;
        }
        .news-empty {
            text-align: center;
            padding: 40px;
            color: var(--text-muted);
            background: var(--body-bg);
            border-radius: var(--radius);
            font-size: 15px;
        }
        @media (max-width: 991.98px) {
            .news-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .news-feature img {
                height: 320px;
            }
        }
        @media (max-width: 575.98px) {
            .news-item {
                flex-wrap: wrap;
                gap: 8px;
                padding: 18px 4px;
            }
            .news-item-title {
                flex-basis: 100%;
                -webkit-line-clamp: 2;
            }
            .news-item-date {
                margin-left: auto;
            }
            .news-feature-content {
                padding: 24px 20px;
            }
            .news-feature-content h3 {
                font-size: 20px;
            }
        }

        /* ========== Process ========== */
        .process-section {
            background: var(--body-bg);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .process-card {
            text-align: center;
            padding: 36px 24px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            position: relative;
            transition: var(--transition);
        }
        .process-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-4px);
        }
        .process-num {
            font-size: 64px;
            font-weight: 800;
            color: var(--primary-light);
            line-height: 1;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .process-card:hover .process-num {
            color: var(--accent-light);
        }
        .process-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 24px;
            color: var(--primary);
            transition: var(--transition);
        }
        .process-card:hover .process-icon {
            background: var(--accent);
            color: #fff;
            transform: scale(1.06);
        }
        .process-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .process-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }
        @media (max-width: 991.98px) {
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 575.98px) {
            .process-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Feature Cards ========== */
        .feature-section {
            background: var(--dark);
            position: relative;
            overflow: hidden;
        }
        .feature-section::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(200, 150, 62, .12), transparent 70%);
        }
        .feature-section .section-head h2 {
            color: #fff;
        }
        .feature-section .section-head p {
            color: rgba(255, 255, 255, .6);
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            position: relative;
            z-index: 2;
        }
        .feature-card {
            background: rgba(255, 255, 255, .06);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, .1);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            transition: var(--transition);
        }
        .feature-card:hover {
            background: rgba(255, 255, 255, .1);
            transform: translateY(-6px);
            box-shadow: 0 20px 50px rgba(0, 0, 0, .3);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #fff;
            margin-bottom: 24px;
            box-shadow: 0 8px 24px rgba(200, 150, 62, .3);
        }
        .feature-card h4 {
            color: #fff;
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-card p {
            color: rgba(255, 255, 255, .65);
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 0;
        }
        @media (max-width: 991.98px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 575.98px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .feature-card {
                padding: 28px 24px;
            }
        }

        /* ========== Select Picks ========== */
        .picks-section {
            background: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .picks-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .picks-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--card-bg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .picks-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .picks-media {
            height: 220px;
            overflow: hidden;
            position: relative;
        }
        .picks-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .6s ease;
        }
        .picks-card:hover .picks-media img {
            transform: scale(1.05);
        }
        .picks-body {
            padding: 28px;
        }
        .picks-tags {
            display: flex;
            gap: 8px;
            margin-bottom: 14px;
            flex-wrap: wrap;
        }
        .picks-tag {
            background: var(--accent-light);
            color: var(--accent-dark);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
        }
        .picks-body h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 10px;
        }
        .picks-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .picks-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
        }
        .picks-more:hover {
            color: var(--accent);
        }
        @media (max-width: 991.98px) {
            .picks-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 575.98px) {
            .picks-grid {
                grid-template-columns: 1fr;
            }
            .picks-media {
                height: 200px;
            }
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--body-bg);
        }
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-item-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 28px;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-item-header:hover {
            color: var(--primary);
        }
        .faq-item-header i {
            color: var(--accent);
            transition: transform .35s ease;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.active .faq-item-header i {
            transform: rotate(180deg);
        }
        .faq-item-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height .4s ease;
        }
        .faq-item-body-inner {
            padding: 0 28px 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.8;
        }
        @media (max-width: 575.98px) {
            .faq-item-header {
                padding: 18px 20px;
                font-size: 15px;
            }
            .faq-item-body-inner {
                padding: 0 20px 18px;
                font-size: 14px;
            }
        }

        /* ========== CTA ========== */
        .cta-section {
            position: relative;
            padding: 100px 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            text-align: center;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 18, 30, .82), rgba(14, 26, 38, .7));
        }
        .cta-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
            margin: 0 auto;
        }
        .cta-content h2 {
            color: #fff;
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 20px;
        }
        .cta-content p {
            color: rgba(255, 255, 255, .8);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 36px;
        }
        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: #fff;
            padding: 16px 44px;
            border-radius: 100px;
            font-size: 17px;
            font-weight: 700;
            border: none;
            transition: var(--transition);
            box-shadow: 0 10px 40px rgba(200, 150, 62, .4);
        }
        .cta-btn:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 16px 50px rgba(200, 150, 62, .5);
        }
        @media (max-width: 767.98px) {
            .cta-section {
                padding: 64px 0;
            }
            .cta-content h2 {
                font-size: 28px;
            }
            .cta-content p {
                font-size: 14px;
            }
            .cta-btn {
                padding: 14px 32px;
                font-size: 15px;
            }
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, .6);
            padding: 72px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 56px;
        }
        .footer-brand .brand-logo {
            color: #fff;
            font-size: 20px;
            display: inline-block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 24px;
            max-width: 320px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, .7);
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            color: rgba(255, 255, 255, .6);
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 28px;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, .4);
        }
        @media (max-width: 991.98px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
        }
        @media (max-width: 575.98px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        /* ========== Misc ========== */
        .btn:focus,
        .nav-link:focus,
        a:focus,
        button:focus {
            outline: 3px solid rgba(200, 150, 62, .4);
            outline-offset: 2px;
        }
        .badge-custom {
            display: inline-block;
        }

/* roulang page: category1 */
:root {
            --primary: #1e3a5f;
            --primary-dark: #142a47;
            --primary-light: #2c5383;
            --accent: #e8b84b;
            --accent-hover: #d4a63a;
            --bg: #f5f7fb;
            --bg-white: #ffffff;
            --bg-deep: #12202f;
            --text: #2a3b54;
            --text-muted: #6b7a8f;
            --border: #e6ebf2;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 12px 32px rgba(20, 40, 70, 0.08);
            --shadow-hover: 0 20px 44px rgba(20, 40, 70, 0.14);
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

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

        a:hover {
            color: var(--accent);
        }

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

        /* Header / Nav */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.04);
        }

        .site-header .nav-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 16px;
            position: relative;
        }

        .nav-group {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            min-width: 0;
        }

        .nav-group.right {
            justify-content: flex-end;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: rgba(30, 58, 95, 0.06);
        }

        .nav-link.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 6px 16px rgba(30, 58, 95, 0.24);
        }

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

        .brand-logo {
            font-size: 22px;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: var(--primary);
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            transition: var(--transition);
        }

        .brand-logo:hover {
            opacity: 0.8;
        }

        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #1d2a38;
            padding: 8px 20px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 4px 12px rgba(232, 184, 75, 0.3);
            transition: var(--transition);
            border: none;
        }

        .header-cta:hover {
            background: var(--accent-hover);
            color: #1d2a38;
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(232, 184, 75, 0.4);
        }

        /* Hero Banner */
        .page-banner {
            position: relative;
            background: linear-gradient(120deg, rgba(18, 32, 47, 0.88) 0%, rgba(30, 58, 95, 0.82) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            padding: 100px 0 90px;
            color: #fff;
            overflow: hidden;
        }

        .page-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 14px;
            color: #f5e6c2;
            backdrop-filter: blur(8px);
            margin-bottom: 20px;
        }

        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .page-banner .banner-desc {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.88);
            max-width: 640px;
            margin-bottom: 32px;
        }

        .banner-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: #1d2a38;
            border: none;
            padding: 14px 30px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 700;
            transition: var(--transition);
            box-shadow: 0 8px 24px rgba(232, 184, 75, 0.35);
        }

        .btn-download:hover {
            background: var(--accent-hover);
            color: #1d2a38;
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(232, 184, 75, 0.45);
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.6);
            color: #fff;
            padding: 12px 28px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        .banner-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 36px;
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
        }

        .banner-stats .stat-item {
            text-align: left;
        }

        .banner-stats .stat-num {
            font-size: 28px;
            font-weight: 800;
            color: var(--accent);
        }

        .banner-stats .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.72);
        }

        /* Section */
        .section {
            padding: 90px 0;
        }

        .section-alt {
            background: var(--bg-white);
        }

        .section-head {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 60px;
        }

        .section-head .eyebrow {
            display: inline-block;
            background: rgba(30, 58, 95, 0.08);
            color: var(--primary);
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 1px;
            padding: 6px 16px;
            border-radius: 999px;
            text-transform: uppercase;
            margin-bottom: 16px;
        }

        .section-head h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }

        .section-head p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* Cards */
        .platform-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .platform-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .platform-card .card-img {
            position: relative;
            height: 190px;
            overflow: hidden;
        }

        .platform-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .platform-card:hover .card-img img {
            transform: scale(1.05);
        }

        .platform-card .card-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(18, 32, 47, 0.35), transparent);
        }

        .platform-card .card-body {
            padding: 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .platform-card .card-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            z-index: 2;
            background: var(--accent);
            color: #1d2a38;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }

        .platform-card .card-body h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }

        .platform-card .card-body p {
            font-size: 15px;
            color: var(--text-muted);
            flex: 1;
            margin-bottom: 18px;
        }

        .platform-card .version-status {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 18px;
        }

        .platform-card .version-status i {
            color: #22a06b;
        }

        .card-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 12px 22px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
        }

        .card-btn:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(30, 58, 95, 0.25);
        }

        /* Steps */
        .steps-wrap {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            counter-reset: step;
        }

        .step-item {
            position: relative;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 36px 24px 28px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .step-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }

        .step-item .step-num {
            counter-increment: step;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border-radius: 12px;
            font-weight: 800;
            font-size: 18px;
            margin: 0 auto 18px;
            box-shadow: 0 6px 16px rgba(30, 58, 95, 0.24);
        }

        .step-item .step-num::before {
            content: counter(step, decimal-leading-zero);
        }

        .step-item h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-muted);
            margin: 0;
        }

        /* Version log */
        .version-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 32px;
            margin-bottom: 16px;
            transition: var(--transition);
            display: flex;
            align-items: flex-start;
            gap: 20px;
        }

        .version-card:hover {
            box-shadow: var(--shadow);
            border-color: rgba(30, 58, 95, 0.3);
            transform: translateX(4px);
        }

        .version-card .version-tag {
            background: var(--primary);
            color: #fff;
            font-size: 14px;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 8px;
            white-space: nowrap;
        }

        .version-card .version-tag.hot {
            background: var(--accent);
            color: #1d2a38;
        }

        .version-card .version-content {
            flex: 1;
        }

        .version-card .version-content h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text);
        }

        .version-card .version-content p {
            font-size: 15px;
            color: var(--text-muted);
            margin: 0;
        }

        .version-card .version-date {
            font-size: 13px;
            color: #a0aec0;
            white-space: nowrap;
        }

        /* Security Section */
        .security-section {
            background: var(--bg-deep);
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .security-section .section-head h2 {
            color: #fff;
        }

        .security-section .section-head p {
            color: rgba(255, 255, 255, 0.7);
        }

        .security-section .section-head .eyebrow {
            background: rgba(232, 184, 75, 0.15);
            color: var(--accent);
        }

        .security-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .security-item {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            padding: 32px 28px;
            backdrop-filter: blur(10px);
            transition: var(--transition);
        }

        .security-item:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(232, 184, 75, 0.4);
        }

        .security-item .sec-icon {
            width: 52px;
            height: 52px;
            background: var(--accent);
            color: #1d2a38;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
        }

        .security-item h4 {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .security-item p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin: 0;
        }

        /* FAQ */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .accordion-item {
            background: var(--bg-white);
            border: 1px solid var(--border) !important;
            border-radius: 14px !important;
            margin-bottom: 16px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
        }

        .accordion-button {
            background: var(--bg-white);
            color: var(--text);
            font-size: 16px;
            font-weight: 600;
            padding: 22px 28px;
            box-shadow: none;
        }

        .accordion-button:not(.collapsed) {
            background: #f8fafd;
            color: var(--primary);
            box-shadow: none;
        }

        .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.12);
        }

        .accordion-body {
            padding: 0 28px 24px;
            color: var(--text-muted);
            font-size: 15px;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 70px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 480px;
            height: 480px;
            background: rgba(232, 184, 75, 0.12);
            border-radius: 50%;
        }

        .cta-content {
            text-align: center;
            color: #fff;
            position: relative;
            z-index: 2;
        }

        .cta-content h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 14px;
        }

        .cta-content p {
            font-size: 17px;
            opacity: 0.85;
            margin-bottom: 30px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Footer */
        .site-footer {
            background: #0f1a26;
            color: #a8b6c4;
            padding: 70px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1.2fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand .brand-logo {
            background: #fff;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-size: 22px;
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 15px;
            line-height: 1.8;
        }

        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 24px;
        }

        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            color: #a8b6c4;
            font-size: 16px;
            transition: var(--transition);
        }

        .footer-social a:hover {
            background: var(--accent);
            color: #1d2a38;
            transform: translateY(-3px);
        }

        .footer-col h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

        .footer-col ul li {
            margin-bottom: 12px;
        }

        .footer-col ul a {
            color: #a8b6c4;
            font-size: 15px;
            transition: var(--transition);
        }

        .footer-col ul a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-bottom {
            padding: 22px 0;
            text-align: center;
            font-size: 14px;
            color: #6b7a8f;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* Responsive */
        @media (max-width: 992px) {
            .nav-group.left {
                flex: 1.2;
            }
            .brand-logo {
                font-size: 18px;
            }
            .steps-wrap {
                grid-template-columns: repeat(2, 1fr);
            }
            .security-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .site-header .nav-row {
                height: auto;
                padding: 14px 0;
                flex-wrap: wrap;
                gap: 10px;
            }
            .nav-group.left {
                order: 2;
                justify-content: center;
                width: 100%;
                flex: none;
            }
            .nav-group.right {
                order: 2;
                justify-content: center;
                width: 100%;
                flex: none;
            }
            .nav-logo {
                order: 1;
                width: 100%;
            }
            .page-banner {
                padding: 70px 0 60px;
            }
            .page-banner h1 {
                font-size: 32px;
            }
            .section {
                padding: 60px 0;
            }
            .section-head h2 {
                font-size: 28px;
            }
            .steps-wrap {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .security-grid {
                grid-template-columns: 1fr;
            }
            .version-card {
                flex-wrap: wrap;
            }
            .version-date {
                width: 100%;
                padding-left: 8px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 576px) {
            .container {
                padding: 0 18px;
            }
            .nav-link {
                font-size: 14px;
                padding: 6px 14px;
            }
            .brand-logo {
                font-size: 16px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .banner-actions {
                flex-direction: column;
            }
            .btn-download,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
            }
            .banner-stats {
                gap: 20px;
            }
            .banner-stats .stat-num {
                font-size: 22px;
            }
            .cta-content h2 {
                font-size: 26px;
            }
            .platform-card .card-body {
                padding: 20px;
            }
        }

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #eff6ff;
            --accent: #f97316;
            --accent-dark: #ea580c;
            --accent-light: #fff7ed;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-lg: 20px;
            --radius: 14px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.05);
            --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
            --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        input, textarea, select {
            font-family: inherit;
        }
        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section-padding {
            padding: 80px 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 26px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.6;
            border: 2px solid transparent;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.3);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff !important;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff !important;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(249, 115, 22, 0.35);
        }
        .btn-accent:active {
            transform: translateY(0);
        }
        .btn-outline-primary {
            background: transparent;
            color: var(--primary) !important;
            border-color: var(--primary);
        }
        .btn-outline-primary:hover {
            background: var(--primary);
            color: #fff !important;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
        }
        .btn-outline-primary:active {
            transform: translateY(0);
        }
        .btn-light {
            background: #fff;
            color: var(--primary) !important;
            border-color: #fff;
        }
        .btn-light:hover {
            background: rgba(255, 255, 255, 0.9);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
        }
        .btn-block {
            width: 100%;
            margin-bottom: 10px;
        }
        .btn-block:last-child {
            margin-bottom: 0;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            height: 76px;
        }
        .nav-group {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
        }
        .nav-group.left {
            justify-content: flex-start;
        }
        .nav-group.right {
            justify-content: flex-end;
            gap: 12px;
        }
        .brand-logo {
            font-size: 1.12rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: 0.02em;
            white-space: nowrap;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            flex-shrink: 0;
        }
        .brand-logo:hover {
            color: var(--primary);
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            color: var(--text-light);
            font-size: 0.95rem;
            font-weight: 500;
            border-radius: 30px;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .btn-nav {
            padding: 8px 22px;
            font-size: 0.9rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            font-size: 1.2rem;
            color: var(--text);
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 16px 24px 24px;
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-link {
            padding: 12px 16px;
            border-radius: 10px;
            color: var(--text-light);
            font-weight: 500;
            transition: var(--transition);
        }
        .mobile-link:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .btn-mobile-download {
            margin-top: 10px;
        }

        .article-banner {
            position: relative;
            padding: 110px 0 100px;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 138, 0.78) 60%, rgba(37, 99, 235, 0.55) 100%);
        }
        .article-banner .container {
            position: relative;
            z-index: 1;
        }
        .banner-content {
            max-width: 860px;
            margin: 0 auto;
            text-align: center;
        }
        .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.28);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            color: #fff;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            margin-bottom: 20px;
        }
        .banner-content h1 {
            color: #fff;
            font-size: 2.35rem;
            font-weight: 800;
            line-height: 1.35;
            margin: 0 0 18px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
            letter-spacing: 0.01em;
        }
        .banner-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 20px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.92rem;
        }
        .banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }
        .banner-meta i {
            color: rgba(255, 255, 255, 0.6);
        }

        .breadcrumb-wrap {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: 16px 0;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .breadcrumb-nav a {
            color: var(--text-muted);
            padding: 4px 0;
        }
        .breadcrumb-nav a:hover {
            color: var(--primary);
        }
        .breadcrumb-nav i {
            font-size: 0.65rem;
            color: var(--text-muted);
            opacity: 0.6;
        }
        .breadcrumb-nav span {
            color: var(--text-light);
            font-weight: 500;
        }

        .article-wrap {
            background: var(--bg);
        }
        .article-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .article-card:hover {
            box-shadow: var(--shadow);
        }
        .article-toolbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-light);
            margin-bottom: 32px;
        }
        .article-tags {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.82rem;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 20px;
        }
        .tag-accent {
            background: var(--accent-light);
            color: var(--accent);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-light);
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .article-share a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .article-share a:active {
            transform: translateY(0);
        }
        .article-content {
            font-size: 1rem;
            line-height: 1.85;
            color: #334155;
        }
        .article-content h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text);
            margin: 2.2rem 0 1rem;
            padding-left: 14px;
            border-left: 4px solid var(--primary);
            line-height: 1.4;
        }
        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text);
            margin: 1.8rem 0 0.8rem;
        }
        .article-content h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            margin: 1.4rem 0 0.6rem;
        }
        .article-content p {
            margin-bottom: 1.2rem;
            color: #334155;
        }
        .article-content ul,
        .article-content ol {
            margin: 1rem 0 1.5rem;
            padding-left: 0;
            list-style-position: outside;
        }
        .article-content ul li,
        .article-content ol li {
            margin-bottom: 0.5rem;
            padding-left: 0.4rem;
            position: relative;
        }
        .article-content ul {
            list-style: none;
        }
        .article-content ul li::before {
            content: '';
            position: absolute;
            left: -18px;
            top: 0.6em;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
        }
        .article-content ol {
            list-style: decimal;
            padding-left: 1.4em;
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: var(--accent-light);
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.6rem 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-content blockquote p {
            margin-bottom: 0;
        }
        .article-content img {
            border-radius: var(--radius);
            margin: 1.6rem auto;
            box-shadow: var(--shadow-sm);
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
            text-decoration-thickness: 2px;
        }
        .article-content code {
            background: var(--border-light);
            border-radius: 6px;
            padding: 2px 8px;
            font-size: 0.88em;
            color: var(--primary-dark);
        }
        .article-content pre {
            background: var(--bg-dark);
            color: #e2e8f0;
            border-radius: var(--radius);
            padding: 20px 24px;
            overflow-x: auto;
            margin: 1.6rem 0;
        }
        .article-content pre code {
            background: none;
            color: inherit;
            padding: 0;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.6rem 0;
            font-size: 0.95rem;
        }
        .article-content th {
            background: var(--primary-light);
            color: var(--text);
            font-weight: 600;
        }
        .article-content th,
        .article-content td {
            border: 1px solid var(--border);
            padding: 12px 16px;
            text-align: left;
        }
        .article-content tr:hover {
            background: var(--bg);
        }
        .article-content hr {
            border: none;
            border-top: 2px solid var(--border-light);
            margin: 2.4rem 0;
        }
        .article-not-found {
            text-align: center;
            padding: 70px 30px;
        }
        .article-not-found i {
            font-size: 3.5rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: block;
            opacity: 0.5;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }

        .sidebar-sticky {
            display: flex;
            flex-direction: column;
            gap: 24px;
            position: sticky;
            top: 96px;
        }
        .sidebar-widget {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .sidebar-widget:hover {
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 18px;
            padding-bottom: 14px;
            border-bottom: 2px solid var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            width: 100%;
        }
        .widget-title i {
            color: var(--primary);
        }
        .widget-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .widget-list li {
            margin-bottom: 4px;
        }
        .widget-list a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 9px 12px;
            border-radius: 10px;
            color: var(--text-light);
            font-size: 0.94rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .widget-list a:hover {
            background: var(--primary-light);
            color: var(--primary);
            padding-left: 16px;
        }
        .widget-list a i {
            color: var(--primary);
            font-size: 0.72rem;
        }
        .download-widget .btn {
            margin-bottom: 10px;
        }
        .download-widget .btn:last-child {
            margin-bottom: 0;
        }
        .download-widget p {
            color: var(--text-light);
            font-size: 0.88rem;
            margin-bottom: 16px;
        }
        .safety-widget {
            background: linear-gradient(135deg, var(--accent-light), #fff);
            border-color: rgba(249, 115, 22, 0.2);
        }
        .safety-widget .widget-title {
            border-bottom-color: var(--accent);
        }
        .safety-widget .widget-title i {
            color: var(--accent);
        }
        .safety-widget p {
            color: var(--text-light);
            font-size: 0.9rem;
            line-height: 1.7;
            margin: 0;
        }

        .faq-section {
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
        }
        .section-head {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            margin-bottom: 14px;
        }
        .section-head h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin: 0;
            line-height: 1.35;
        }
        .faq-accordion .accordion-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius) !important;
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
        }
        .faq-accordion .accordion-item:last-child {
            margin-bottom: 0;
        }
        .faq-accordion .accordion-button {
            font-weight: 600;
            color: var(--text);
            background: var(--bg-white);
            padding: 18px 26px;
            font-size: 1rem;
            border: none;
            transition: var(--transition);
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            background: var(--primary-light);
            color: var(--primary);
            box-shadow: none;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
            border-color: transparent;
        }
        .faq-accordion .accordion-button::after {
            background-size: 1rem;
            transition: var(--transition);
        }
        .faq-accordion .accordion-body {
            padding: 20px 26px;
            color: var(--text-light);
            line-height: 1.75;
            background: var(--bg-white);
        }

        .cta-section {
            position: relative;
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 58, 138, 0.88), rgba(37, 99, 235, 0.78)), url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .cta-inner {
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }
        .cta-inner h2 {
            color: #fff;
            font-size: 2.1rem;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }
        .cta-inner p {
            color: rgba(255, 255, 255, 0.75);
            font-size: 1.05rem;
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 70px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 50px;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.92rem;
            line-height: 1.75;
            margin: 16px 0 20px;
            max-width: 320px;
        }
        .footer-brand .brand-logo {
            color: #fff;
            font-size: 1.3rem;
            font-weight: 800;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-col h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.92rem;
            line-height: 1.6;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom p {
            margin: 0;
        }

        @media (max-width: 1024px) {
            .article-banner {
                padding: 80px 0 70px;
            }
            .banner-content h1 {
                font-size: 2rem;
            }
            .footer-grid {
                grid-template-columns: 1.2fr 1fr 1fr;
                gap: 30px;
            }
            .section-padding {
                padding: 60px 0;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                height: 64px;
            }
            .nav-group {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .brand-logo {
                font-size: 1rem;
                flex: 1;
                justify-content: center;
            }
            .article-banner {
                padding: 60px 0 55px;
            }
            .banner-content h1 {
                font-size: 1.6rem;
            }
            .banner-meta {
                gap: 10px;
                font-size: 0.85rem;
            }
            .article-card {
                padding: 24px;
            }
            .article-toolbar {
                flex-direction: column;
                align-items: flex-start;
            }
            .sidebar-sticky {
                position: static;
            }
            .section-head h2 {
                font-size: 1.5rem;
            }
            .cta-section {
                padding: 60px 0;
            }
            .cta-inner h2 {
                font-size: 1.6rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .section-padding {
                padding: 50px 0;
            }
            .article-content h2 {
                font-size: 1.4rem;
            }
            .article-content h3 {
                font-size: 1.2rem;
            }
            .article-content {
                font-size: 0.97rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .brand-logo {
                font-size: 0.95rem;
                font-weight: 800;
            }
            .brand-full {
                display: none;
            }
            .brand-short {
                display: inline;
            }
            .article-banner {
                padding: 48px 0 42px;
            }
            .banner-content h1 {
                font-size: 1.35rem;
            }
            .banner-meta {
                flex-direction: column;
                gap: 6px;
            }
            .article-card {
                padding: 20px;
            }
            .article-toolbar {
                padding-bottom: 18px;
                margin-bottom: 24px;
            }
            .article-content {
                font-size: 0.95rem;
            }
            .article-content h2 {
                font-size: 1.25rem;
                padding-left: 10px;
            }
            .article-content h3 {
                font-size: 1.1rem;
            }
            .faq-accordion .accordion-button {
                padding: 15px 18px;
                font-size: 0.92rem;
            }
            .faq-accordion .accordion-body {
                padding: 16px 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: auto;
            }
            .section-head h2 {
                font-size: 1.3rem;
            }
            .section-head {
                margin-bottom: 36px;
            }
            .cta-inner h2 {
                font-size: 1.35rem;
            }
            .cta-inner p {
                font-size: 0.95rem;
            }
            .btn-lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }

        .brand-short {
            display: none;
        }
        @media (max-width: 520px) {
            .brand-short {
                display: inline;
            }
        }

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

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2d6cdf;
            --primary-dark: #1e56c4;
            --primary-light: #eaf0fe;
            --accent: #06b6d4;
            --dark: #0f172b;
            --dark-2: #1e293b;
            --text: #334155;
            --text-light: #64748b;
            --bg: #f8fafc;
            --bg-alt: #ffffff;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 10px rgba(15,23,42,.05);
            --shadow: 0 8px 30px rgba(15,23,42,.08);
            --shadow-lg: 0 20px 50px rgba(15,23,42,.12);
            --transition: all .3s ease;
            --container: 1280px;
        }

        /* ===== Reset ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: #fff;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }
        button, input, select { font-family: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5 { line-height: 1.3; color: var(--dark); font-weight: 700; }
        .container { max-width: var(--container); padding-left: 24px; padding-right: 24px; margin: 0 auto; }

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(255,255,255,.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            height: 78px;
            gap: 16px;
        }
        .nav-group {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-group.left { justify-content: flex-start; }
        .nav-group.right { justify-content: flex-end; }
        .nav-link {
            padding: 9px 18px;
            border-radius: 22px;
            color: var(--text);
            font-weight: 500;
            font-size: 14.5px;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-link.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 4px 14px rgba(45,108,223,.32);
        }
        .brand-logo {
            font-size: 21px;
            font-weight: 800;
            letter-spacing: 1px;
            white-space: nowrap;
            color: var(--dark);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            justify-self: center;
        }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 20px;
            border-radius: 22px;
            background: var(--dark);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
        }
        .header-cta:hover {
            background: var(--primary);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(15,23,42,.25);
            color: #fff;
        }
        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border: none;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 10px;
            font-size: 18px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: var(--primary);
            color: #fff;
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: 16px 24px 20px;
            background: #fff;
            border-top: 1px solid var(--border);
            gap: 4px;
        }
        .mobile-menu.open { display: flex; }
        .mobile-link {
            padding: 12px 14px;
            border-radius: 10px;
            color: var(--text);
            font-weight: 500;
        }
        .mobile-link:hover { background: var(--primary-light); color: var(--primary); }
        .mobile-link.active { background: var(--primary); color: #fff; }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            padding: 120px 0 100px;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,.92), rgba(30,41,60,.72) 55%, rgba(6,182,212,.35));
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,.25);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 7px 18px;
            border-radius: 30px;
            margin-bottom: 24px;
            letter-spacing: .5px;
        }
        .hero-badge i { color: #7dd3fc; }
        .page-hero h1 {
            color: #fff;
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 20px;
        }
        .page-hero h1 span {
            background: linear-gradient(120deg, #7dd3fc, #67e8f9);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero p {
            color: rgba(255,255,255,.88);
            font-size: 17px;
            line-height: 1.8;
            margin-bottom: 36px;
            max-width: 580px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .hero-actions .btn {
            border-radius: 14px;
            padding: 13px 30px;
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
        }
        .hero-actions .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 8px 25px rgba(45,108,223,.4);
        }
        .hero-actions .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(45,108,223,.5);
        }
        .hero-actions .btn-outline-light {
            border: 1.5px solid rgba(255,255,255,.6);
            color: #fff;
            backdrop-filter: blur(4px);
        }
        .hero-actions .btn-outline-light:hover {
            background: rgba(255,255,255,.12);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 通用板块 ===== */
        .section { padding: 100px 0; }
        .section-alt { background: var(--bg); }
        .section-dark { background: var(--dark); }
        .section-head {
            max-width: 640px;
            margin: 0 auto 60px;
            text-align: center;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 16px;
            border-radius: 30px;
            letter-spacing: .5px;
            margin-bottom: 16px;
        }
        .section-tag.dark {
            color: #7dd3fc;
            background: rgba(125,211,252,.12);
        }
        .section-head h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .section-head p {
            color: var(--text-light);
            font-size: 16px;
            line-height: 1.8;
        }
        .section-head.light h2 { color: #fff; }
        .section-head.light p { color: rgba(255,255,255,.7); }

        /* ===== 步骤 ===== */
        .steps-section {
            background: url('/assets/images/backpic/back-1.png') top right / 600px auto no-repeat, var(--bg);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .step-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 36px 28px;
            position: relative;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: transparent;
        }
        .step-num {
            font-size: 14px;
            font-weight: 800;
            color: var(--primary);
            background: var(--primary-light);
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 20px;
        }
        .step-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 22px;
            margin-bottom: 20px;
            box-shadow: 0 8px 20px rgba(45,108,223,.3);
        }
        .step-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
            font-weight: 700;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== 教程卡片 ===== */
        .tutorials-section { background: var(--dark); }
        .tutorials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .tutorial-card {
            background: var(--dark-2);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255,255,255,.08);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .tutorial-card:hover {
            transform: translateY(-8px);
            border-color: rgba(125,211,252,.35);
            box-shadow: 0 20px 45px rgba(0,0,0,.3);
        }
        .card-cover {
            position: relative;
            aspect-ratio: 16/10;
            overflow: hidden;
        }
        .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .tutorial-card:hover .card-cover img { transform: scale(1.05); }
        .card-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15,23,42,.5), transparent 60%);
        }
        .card-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            z-index: 2;
            background: rgba(255,255,255,.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,.25);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 20px;
        }
        .card-body {
            padding: 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            color: #fff;
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .card-body p {
            color: rgba(255,255,255,.65);
            font-size: 14px;
            line-height: 1.8;
            flex: 1;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: #7dd3fc;
            font-size: 14px;
            font-weight: 600;
            margin-top: 18px;
            transition: var(--transition);
        }
        .card-link:hover { gap: 14px; color: #fff; }
        .card-link i { font-size: 13px; }

        /* ===== 使用技巧 ===== */
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .tip-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 34px 26px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .tip-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: transparent;
        }
        .tip-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin: 0 auto 20px;
            transition: var(--transition);
        }
        .tip-card:hover .tip-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.08);
        }
        .tip-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .tip-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== FAQ ===== */
        .faq-section { background: var(--bg); }
        .faq-wrap { max-width: 840px; margin: 0 auto; }
        .accordion-item {
            background: #fff;
            border: 1px solid var(--border) !important;
            border-radius: var(--radius-sm) !important;
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .accordion-item:last-child { margin-bottom: 0; }
        .accordion-item:focus-within { border-color: var(--primary) !important; box-shadow: 0 0 0 4px var(--primary-light); }
        .accordion-button {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--dark);
            background: #fff;
            transition: var(--transition);
        }
        .accordion-button:not(.collapsed) {
            background: var(--primary-light);
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }
        .accordion-body {
            padding: 6px 24px 24px;
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-cta {
            text-align: center;
            margin-top: 36px;
            font-size: 15px;
            color: var(--text-light);
        }
        .faq-cta a {
            color: var(--primary);
            font-weight: 600;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .faq-cta a:hover { color: var(--primary-dark); }

        /* ===== CTA ===== */
        .cta-section { padding: 90px 0; background: var(--dark); }
        .cta-box {
            background: linear-gradient(135deg, rgba(45,108,223,.15), rgba(6,182,212,.1)), url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            border-radius: var(--radius-lg);
            padding: 70px 50px;
            text-align: center;
            border: 1px solid rgba(255,255,255,.1);
            position: relative;
            overflow: hidden;
        }
        .cta-box h2 {
            color: #fff;
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .cta-box p {
            color: rgba(255,255,255,.75);
            font-size: 16px;
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 14px;
        }
        .cta-buttons .btn {
            border-radius: 14px;
            padding: 13px 32px;
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
        }
        .cta-buttons .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
        }
        .cta-buttons .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(45,108,223,.45);
        }
        .cta-buttons .btn-success {
            background: #10b981;
            border-color: #10b981;
        }
        .cta-buttons .btn-success:hover {
            background: #059669;
            border-color: #059669;
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(16,185,129,.4);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0b1220;
            color: rgba(255,255,255,.65);
            padding: 70px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 50px;
            padding-bottom: 50px;
            border-bottom: 1px solid rgba(255,255,255,.08);
        }
        .footer-brand .brand-logo {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            background: linear-gradient(135deg, #7dd3fc, #2d6cdf);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 16px;
            display: inline-block;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 22px;
            max-width: 320px;
        }
        .footer-social {
            display: flex;
            gap: 10px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: rgba(255,255,255,.08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,.7);
            font-size: 15px;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-col h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            color: rgba(255,255,255,.6);
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,.4);
        }

        /* ===== 响应式断点 ===== */
        @media (max-width: 1024px) {
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .tutorials-grid { grid-template-columns: repeat(2, 1fr); }
            .tips-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
        }
        @media (max-width: 991px) {
            .nav-group { display: none; }
            .mobile-toggle { display: flex; }
            .header-inner { grid-template-columns: 1fr auto 1fr; }
            .brand-logo { font-size: 18px; }
            .header-cta { display: none; }
        }
        @media (max-width: 768px) {
            .section { padding: 70px 0; }
            .page-hero { padding: 90px 0 70px; }
            .page-hero h1 { font-size: 32px; }
            .section-head h2 { font-size: 28px; }
            .steps-grid { grid-template-columns: 1fr; }
            .tutorials-grid { grid-template-columns: 1fr; }
            .tips-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .cta-box { padding: 50px 24px; }
            .cta-box h2 { font-size: 26px; }
        }
        @media (max-width: 520px) {
            .container { padding-left: 18px; padding-right: 18px; }
            .header-inner { height: 68px; }
            .brand-logo { font-size: 16px; }
            .hero-actions .btn { width: 100%; }
            .tips-grid { grid-template-columns: 1fr; }
            .step-card { padding: 28px 22px; }
            .cta-buttons .btn { width: 100%; }
            .footer-grid { grid-template-columns: 1fr; }
        }