/* roulang page: index */
:root {
            --color-primary: #6C5CE7;
            --color-primary-dark: #5A4FCF;
            --color-secondary: #00CEC9;
            --color-secondary-light: rgba(0, 206, 201, 0.1);
            --color-dark: #2D3436;
            --color-light: #FFFFFF;
            --color-background: #F8F9FA;
            --color-border: #E9ECEF;
            --color-text: #2D3436;
            --color-text-light: #6C767D;
            --color-success: #00B894;
            --color-warning: #FDCB6E;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.05);
            --shadow-md: 0 4px 12px rgba(108, 92, 231, 0.08);
            --shadow-lg: 0 8px 24px rgba(108, 92, 231, 0.12);
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --spacing-xxl: 4rem;
            --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
            --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-light);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: var(--spacing-md);
            color: var(--color-dark);
        }
        h1 {
            font-size: 2.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--color-primary);
        }
        h3 {
            font-size: 1.5rem;
        }
        p {
            margin-bottom: var(--spacing-md);
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }
        .section {
            padding: var(--spacing-xxl) 0;
        }
        .section-light {
            background-color: var(--color-background);
        }
        .btn {
            display: inline-block;
            padding: 0.875rem 2rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            font-size: 1rem;
        }
        .btn-primary {
            background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
            color: var(--color-light);
            box-shadow: var(--shadow-md);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            color: var(--color-light);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
        }
        .btn-secondary:hover {
            background-color: rgba(108, 92, 231, 0.05);
            transform: translateY(-2px);
        }
        .card {
            background: var(--color-light);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: all 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
            border-color: var(--color-primary);
        }
        .card-icon {
            font-size: 2.5rem;
            color: var(--color-primary);
            margin-bottom: var(--spacing-md);
            display: inline-block;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1;
            background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: var(--spacing-xs);
        }
        .stat-label {
            font-size: 1rem;
            color: var(--color-text-light);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .faq-item {
            border-bottom: 1px solid var(--color-border);
            padding: var(--spacing-md) 0;
        }
        .faq-question {
            font-weight: 600;
            font-size: 1.125rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            color: var(--color-primary);
            transition: transform 0.3s ease;
        }
        .faq-question.active::after {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding-top: var(--spacing-sm);
            display: none;
        }
        .faq-answer.active {
            display: block;
        }
        .form-control {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            font-family: var(--font-body);
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: var(--color-secondary);
            box-shadow: 0 0 0 3px rgba(0, 206, 201, 0.2);
        }

        /* App Shell Navigation */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }
        .app-nav {
            width: 80px;
            background-color: var(--color-dark);
            color: var(--color-light);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: var(--spacing-lg) 0;
            transition: width 0.3s ease;
        }
        .app-nav:hover {
            width: 200px;
            align-items: flex-start;
            padding-left: var(--spacing-md);
        }
        .app-nav:hover .nav-text {
            display: inline-block;
            opacity: 1;
        }
        .nav-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--color-secondary);
            margin-bottom: var(--spacing-xl);
            text-decoration: none;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .nav-logo i {
            font-size: 2rem;
            flex-shrink: 0;
        }
        .nav-text {
            display: none;
            opacity: 0;
            transition: opacity 0.3s ease 0.1s;
        }
        .nav-menu {
            list-style: none;
            width: 100%;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            flex-grow: 1;
        }
        .nav-item {
            width: 100%;
        }
        .nav-link {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            color: rgba(255, 255, 255, 0.7);
            padding: var(--spacing-sm);
            border-radius: var(--radius-md);
            text-decoration: none;
            white-space: nowrap;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--color-light);
            background-color: rgba(255, 255, 255, 0.05);
        }
        .nav-link.active {
            color: var(--color-light);
            background-color: rgba(108, 92, 231, 0.2);
            border-left: 3px solid var(--color-primary);
        }
        .nav-icon {
            font-size: 1.25rem;
            width: 24px;
            text-align: center;
            flex-shrink: 0;
        }
        .app-main {
            flex: 1;
            margin-left: 80px;
            width: calc(100% - 80px);
        }

        /* Hero */
        .hero {
            padding: var(--spacing-xxl) 0;
            background: linear-gradient(135deg, rgba(45, 52, 54, 0.95) 0%, rgba(45, 52, 54, 0.85) 100%), url('/assets/images/backpic/back-1.webp') no-repeat center center;
            background-size: cover;
            color: var(--color-light);
        }
        .hero h1 {
            color: var(--color-light);
            font-size: 3rem;
            margin-bottom: var(--spacing-md);
        }
        .hero p {
            font-size: 1.25rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: var(--spacing-xl);
            max-width: 800px;
        }
        .stats-grid {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            margin-top: var(--spacing-xl);
        }

        /* Services */
        .service-card {
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
            border-radius: var(--radius-sm);
        }

        /* Case Study */
        .case-comparison {
            background: var(--color-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .case-before, .case-after {
            padding: var(--spacing-lg);
        }
        .case-before {
            border-right: 1px solid var(--color-border);
        }
        .case-tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: var(--color-secondary-light);
            color: var(--color-secondary);
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: var(--spacing-sm);
        }

        /* Footer */
        .site-footer {
            background-color: var(--color-dark);
            color: var(--color-light);
            padding: var(--spacing-xxl) 0 var(--spacing-lg);
        }
        .footer-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--color-secondary);
            margin-bottom: var(--spacing-md);
            display: inline-block;
        }
        .footer-links {
            list-style: none;
            margin-bottom: var(--spacing-lg);
        }
        .footer-links li {
            margin-bottom: var(--spacing-xs);
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: var(--color-secondary);
        }
        .footer-contact {
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-contact i {
            color: var(--color-secondary);
            margin-right: var(--spacing-xs);
            width: 20px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: var(--spacing-md);
            margin-top: var(--spacing-lg);
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.875rem;
        }

        /* Responsive */
        @media (max-width: 1023px) {
            h1 { font-size: 2.25rem; }
            h2 { font-size: 1.75rem; }
            .section { padding: var(--spacing-xl) 0; }
            .app-nav {
                width: 60px;
            }
            .app-main {
                margin-left: 60px;
                width: calc(100% - 60px);
            }
            .nav-logo span {
                display: none;
            }
            .app-nav:hover {
                width: 200px;
            }
            .app-nav:hover .nav-logo span {
                display: inline;
            }
        }
        @media (max-width: 767px) {
            .app-nav {
                width: 100%;
                height: 70px;
                flex-direction: row;
                justify-content: space-between;
                padding: 0 var(--spacing-md);
                bottom: auto;
            }
            .app-nav:hover {
                width: 100%;
                height: 70px;
                padding: 0 var(--spacing-md);
            }
            .nav-logo {
                margin-bottom: 0;
            }
            .nav-text {
                display: inline-block;
               opacity: 1;
            }
            .nav-menu {
                flex-direction: row;
                justify-content: flex-end;
                gap: var(--spacing-xs);
                flex-grow: 0;
            }
            .nav-link {
                padding: var(--spacing-xs);
                border-left: none;
                border-bottom: 3px solid transparent;
            }
            .nav-link.active {
                border-left: none;
                border-bottom: 3px solid var(--color-primary);
            }
            .app-main {
                margin-left: 0;
                margin-top: 70px;
                width: 100%;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1.125rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 520px) {
            .grid-x {
                flex-direction: column;
            }
            .cell {
                width: 100%;
                margin-bottom: var(--spacing-md);
            }
            .btn {
                width: 100%;
                display: block;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #6C5CE7;
            --color-primary-dark: #5A4FCF;
            --color-secondary: #00CEC9;
            --color-text: #2D3436;
            --color-text-light: #636E72;
            --color-light: #FFFFFF;
            --color-dark: #2D3436;
            --color-background: #FFFFFF;
            --color-background-alt: #F8F9FA;
            --color-border: #E9ECEF;
            --border-radius: 12px;
            --border-radius-sm: 8px;
            --shadow: 0 4px 12px rgba(108, 92, 231, 0.08);
            --shadow-hover: 0 8px 24px rgba(108, 92, 231, 0.15);
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2.5rem;
            --spacing-xl: 4rem;
            --transition: all 0.3s ease;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
            font-size: 1rem;
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-background);
            min-height: 100vh;
            display: flex;
            overflow-x: hidden;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--spacing-md);
            padding-right: var(--spacing-md);
        }
        .section {
            padding: var(--spacing-xl) 0;
        }
        .section-alt {
            background-color: var(--color-background-alt);
        }
        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: var(--spacing-md);
            color: var(--color-dark);
        }
        @media (max-width: 640px) {
            h1 { font-size: 2rem; }
        }
        h2 {
            font-size: 2rem;
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: var(--spacing-lg);
            color: var(--color-dark);
        }
        @media (max-width: 640px) {
            h2 { font-size: 1.75rem; }
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: var(--spacing-sm);
            color: var(--color-dark);
        }
        @media (max-width: 640px) {
            h3 { font-size: 1.25rem; }
        }
        .lead-text {
            font-size: 1.25rem;
            color: var(--color-text-light);
            line-height: 1.7;
            margin-bottom: var(--spacing-lg);
        }
        .btn {
            display: inline-block;
            padding: 0.875rem 2rem;
            background-color: var(--color-primary);
            color: var(--color-light);
            border: none;
            border-radius: var(--border-radius-sm);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            box-shadow: var(--shadow);
        }
        .btn:hover, .btn:focus {
            background-color: var(--color-primary-dark);
            color: var(--color-light);
            transform: scale(1.05);
            box-shadow: var(--shadow-hover);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--color-primary);
            border: 1px solid var(--color-primary);
        }
        .btn-secondary:hover {
            background-color: rgba(108, 92, 231, 0.05);
        }
        .btn-cta {
            background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
            font-size: 1.125rem;
            padding: 1rem 2.5rem;
        }
        .card {
            background: var(--color-light);
            border-radius: var(--border-radius);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow);
            height: 100%;
            transition: var(--transition);
            border: 1px solid var(--color-border);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-5px);
        }
        .card-icon {
            font-size: 2.5rem;
            color: var(--color-primary);
            margin-bottom: var(--spacing-md);
        }
        .data-stat {
            font-size: 3rem;
            font-weight: 700;
            line-height: 1;
            color: var(--color-secondary);
            margin-bottom: var(--spacing-xs);
        }
        .data-label {
            font-size: 1rem;
            color: var(--color-text-light);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: rgba(108, 92, 231, 0.1);
            color: var(--color-primary);
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 500;
            margin-right: var(--spacing-xs);
            margin-bottom: var(--spacing-xs);
        }
        /* App Shell Navigation */
        .app-nav {
            position: fixed;
            left: 0;
            top: 0;
            bottom: 0;
            width: 80px;
            background-color: var(--color-dark);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: var(--spacing-lg) 0;
            z-index: 100;
        }
        .nav-logo {
            color: var(--color-light);
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: var(--spacing-xl);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .nav-logo .fa-gamepad {
            font-size: 2rem;
            color: var(--color-secondary);
            margin-bottom: var(--spacing-xs);
        }
        .nav-text {
            font-size: 0.9rem;
        }
        .nav-menu {
            list-style: none;
            width: 100%;
            flex-grow: 1;
        }
        .nav-item {
            width: 100%;
            margin-bottom: var(--spacing-md);
        }
        .nav-link {
            display: flex;
            flex-direction: column;
            align-items: center;
            color: rgba(255, 255, 255, 0.7);
            padding: var(--spacing-sm) 0;
            position: relative;
            border-left: 3px solid transparent;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--color-light);
            background-color: rgba(108, 92, 231, 0.2);
            border-left-color: var(--color-primary);
        }
        .nav-icon {
            font-size: 1.5rem;
            margin-bottom: 0.25rem;
        }
        .main-content {
            flex: 1;
            margin-left: 80px;
            width: calc(100% - 80px);
        }
        @media (max-width: 1023px) {
            .app-nav {
                width: 100%;
                height: 70px;
                flex-direction: row;
                padding: 0 var(--spacing-md);
                justify-content: space-between;
            }
            .nav-logo {
                margin-bottom: 0;
                flex-direction: row;
            }
            .nav-logo .fa-gamepad {
                margin-bottom: 0;
                margin-right: var(--spacing-sm);
            }
            .nav-menu {
                display: flex;
                flex-grow: 0;
                margin-left: auto;
            }
            .nav-item {
                margin-bottom: 0;
                margin-left: var(--spacing-sm);
            }
            .nav-link {
                padding: var(--spacing-sm);
                border-left: none;
                border-bottom: 3px solid transparent;
            }
            .nav-link.active {
                border-left-color: transparent;
                border-bottom-color: var(--color-primary);
            }
            .main-content {
                margin-left: 0;
                width: 100%;
                margin-top: 70px;
            }
        }
        /* Hero */
        .category-hero {
            background: linear-gradient(rgba(45, 52, 54, 0.85), rgba(45, 52, 54, 0.9)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            color: var(--color-light);
            padding: var(--spacing-xl) 0;
        }
        .category-hero h1 {
            color: var(--color-light);
        }
        .category-hero .lead-text {
            color: rgba(255, 255, 255, 0.85);
        }
        /* Process */
        .process-step {
            counter-increment: step-counter;
            position: relative;
            padding-left: calc(var(--spacing-xl) + var(--spacing-md));
            margin-bottom: var(--spacing-xl);
        }
        .process-step::before {
            content: counter(step-counter);
            position: absolute;
            left: 0;
            top: 0;
            width: var(--spacing-xl);
            height: var(--spacing-xl);
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            font-weight: 700;
        }
        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--color-border);
            padding: var(--spacing-md) 0;
        }
        .faq-question {
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            color: var(--color-primary);
            transition: transform 0.3s ease;
        }
        .faq-item.active .faq-question::after {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: var(--color-text-light);
            padding-top: 0;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-top: var(--spacing-md);
        }
        /* Footer */
        .site-footer {
            background-color: var(--color-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: var(--spacing-xl) 0 var(--spacing-md);
        }
        .footer-logo {
            color: var(--color-light);
            font-size: 1.75rem;
            font-weight: 700;
            display: inline-block;
            margin-bottom: var(--spacing-md);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: var(--spacing-sm);
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-links a:hover {
            color: var(--color-secondary);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            margin-top: var(--spacing-xl);
            padding-top: var(--spacing-md);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.875rem;
        }