/* roulang page: index */
:root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --accent-color: #ffc107;
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg: #ffffff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --radius-sm: 0.25rem;
            --radius-md: 0.5rem;
            --radius-lg: 1rem;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --container-width: 1140px;
            --header-height: 70px;
            --hero-min-height: 500px;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            overflow-x: hidden;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover, a:focus {
            color: #0056b3;
            text-decoration: underline;
        }

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

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: var(--spacing-sm);
            font-weight: 600;
            line-height: 1.3;
        }

        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.75rem; }
        h4 { font-size: 1.5rem; }
        h5 { font-size: 1.25rem; }
        h6 { font-size: 1rem; }

        .btn {
            display: inline-block;
            padding: var(--spacing-xs) var(--spacing-md);
            font-size: 1rem;
            font-weight: 500;
            border: none;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: #ffffff;
        }

        .btn-primary:hover, .btn-primary:focus {
            background-color: #0056b3;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px var(--shadow-color);
        }

        .btn-secondary {
            background-color: var(--secondary-color);
            color: #ffffff;
        }

        .btn-secondary:hover, .btn-secondary:focus {
            background-color: #5a6268;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px var(--shadow-color);
        }

        .card {
            background-color: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: 0 4px 12px var(--shadow-color);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            margin-bottom: var(--spacing-lg);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px var(--shadow-color);
        }

        .card-body {
            padding: var(--spacing-md);
        }

        .card-img-top {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-top-left-radius: var(--radius-lg);
            border-top-right-radius: var(--radius-lg);
        }

        .section {
            padding: var(--spacing-lg) 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: var(--spacing-md);
            font-size: 2rem;
        }

        .section-subtitle {
            text-align: center;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-lg);
        }

        /* Header */
        .site-header {
            background-color: var(--card-bg);
            box-shadow: 0 2px 8px var(--shadow-color);
            padding: var(--spacing-xs) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
        }

        .logo:hover {
            text-decoration: none;
            color: #0056b3;
        }

        .main-nav ul {
            list-style: none;
            display: flex;
            margin: 0;
            padding: 0;
        }

        .main-nav li {
            margin-left: var(--spacing-md);
        }

        .main-nav a {
            color: var(--text-color);
            font-weight: 500;
            padding: var(--spacing-xs) 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .main-nav a:hover, .main-nav a:focus {
            color: var(--primary-color);
            text-decoration: none;
        }

        .main-nav a.active {
            color: var(--primary-color);
            font-weight: bold;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }

        .main-nav a:hover::after, .main-nav a:focus::after {
            width: 100%;
        }
        
        /* Mobile Nav (Hamburger Icon & Menu) */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--text-color);
        }

        .mobile-nav-menu {
            display: none;
            position: absolute;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background-color: var(--card-bg);
            box-shadow: 0 4px 12px var(--shadow-color);
            padding: var(--spacing-md);
            z-index: 999;
        }

        .mobile-nav-menu ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .mobile-nav-menu li {
            margin-bottom: var(--spacing-sm);
        }

        .mobile-nav-menu a {
            display: block;
            padding: var(--spacing-xs) 0;
            font-weight: 500;
        }
        .mobile-nav-menu a.active {
            font-weight: bold;
            color: var(--primary-color);
        }


        /* Hero Section */
        .hero {
            background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            min-height: var(--hero-min-height);
            display: flex;
            align-items: center;
            color: #ffffff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-content {
            z-index: 2;
        }

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-md);
            animation: fadeInUp 1s ease-out forwards;
        }

        .hero p {
            font-size: 1.25rem;
            margin-bottom: var(--spacing-lg);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            animation: fadeInUp 1.5s ease-out forwards;
        }
        
        /* Feature Section */
        .features .container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

        .feature-item {
            text-align: center;
            padding: var(--spacing-md);
            border-radius: var(--radius-lg);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px var(--shadow-color);
            background-color: var(--card-bg);
        }

        .feature-item i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-sm);
        }

        .feature-item h4 {
            font-size: 1.5rem;
            margin-bottom: var(--spacing-xs);
        }

        .feature-item p {
            color: var(--light-text-color);
        }

        /* Latest Posts Section */
        .latest-posts .card-columns {
            column-count: 3;
            column-gap: var(--spacing-lg);
        }

        .latest-posts .card {
            display: inline-block;
            width: 100%;
            margin-bottom: var(--spacing-lg);
        }

        .latest-posts .card-body {
            padding: var(--spacing-md);
        }

        .latest-posts .card-title {
            font-size: 1.25rem;
            margin-bottom: var(--spacing-xs);
        }

        .latest-posts .card-meta {
            font-size: 0.85rem;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-sm);
        }
        
        .latest-posts .card-text {
            font-size: 0.95rem;
        }

        /* Call to Action */
        .cta {
            background-color: var(--primary-color);
            color: #ffffff;
            padding: var(--spacing-lg) 0;
            text-align: center;
        }

        .cta h2 {
            font-size: 2.5rem;
            margin-bottom: var(--spacing-md);
        }

        .cta p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-lg);
        }

        .cta .btn {
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-lg);
            font-size: 1.1rem;
            font-weight: bold;
        }
        .cta .btn:hover, .cta .btn:focus {
            background-color: #e0a800;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        /* Footer */
        .site-footer {
            background-color: var(--text-color);
            color: #ffffff;
            padding: var(--spacing-lg) 0;
            text-align: center;
            font-size: 0.9rem;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }
        
        .footer-col h4 {
            margin-bottom: var(--spacing-sm);
            color: var(--accent-color);
        }

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

        .footer-col li {
            margin-bottom: var(--spacing-xs);
        }

        .footer-col a {
            color: #ffffff;
            opacity: 0.8;
        }

        .footer-col a:hover, .footer-col a:focus {
            opacity: 1;
            color: var(--accent-color);
            text-decoration: underline;
        }

        .footer-bottom {
            margin-top: var(--spacing-lg);
            padding-top: var(--spacing-md);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-bottom a {
            color: var(--accent-color);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Responsive */
        @media (max-width: 992px) {
            .container {
                padding: 0 var(--spacing-md);
            }
            .hero h1 { font-size: 3rem; }
            .hero p { font-size: 1.1rem; }

            .features .container {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .site-footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 60px;
                --hero-min-height: 400px;
            }
            .main-nav { display: none; }
            .mobile-nav-toggle { display: block; }

            .site-header .container {
                justify-content: space-between;
            }

            .hero h1 { font-size: 2.5rem; }
            .hero p { font-size: 1rem; }
            .hero .btn { padding: var(--spacing-xs) var(--spacing-md); }

            .features .container {
                grid-template-columns: 1fr;
            }
            
            .latest-posts .card-columns {
                column-count: 1;
            }

            .cta h2 { font-size: 2rem; }
            .cta p { font-size: 1.1rem; }

            .site-footer .container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 0.95rem; }
            .section-title { font-size: 1.8rem; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
        }

/* roulang page: article */
:root {
            --primary-color: #ff6f61;
            --secondary-color: #ff9e9a;
            --accent-color: #f0ad4e;
            --background-color: #f8f8f8;
            --text-color: #333;
            --text-muted-color: #777;
            --border-color: #ddd;
            --card-bg: #fff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --rounded-lg: 8px;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: 'Arial', sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover, a:focus {
            color: var(--secondary-color);
            text-decoration: underline;
        }

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

        .container {
            width: 90%;
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: calc(var(--spacing-unit) * 2) 0;
        }

        .main-nav {
            background-color: #fff;
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-unit) 0;
        }

        .main-nav ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            justify-content: center;
            gap: calc(var(--spacing-unit) * 2);
        }

        .main-nav ul li a {
            color: var(--text-color);
            font-weight: bold;
            padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
            border-radius: var(--rounded-lg);
            transition: background-color 0.3s ease, color 0.3s ease;
        }
        
        .main-nav ul li a.active {
            background-color: var(--primary-color);
            color: #fff;
        }

        .main-nav ul li a:hover, .main-nav ul li a:focus {
            background-color: var(--secondary-color);
            color: #fff;
            text-decoration: none;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            margin-right: var(--spacing-unit);
        }

        .site-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-unit) 0;
            background-color: #fff;
            box-shadow: var(--shadow-sm);
        }

        .hero-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.4);
        }

        .hero-section .container {
            position: relative;
            z-index: 1;
        }
        
        .hero-section h1 {
            font-size: 2.5rem;
            margin-bottom: var(--spacing-unit);
            color: #fff;
        }

        .hero-section p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.9);
        }

        .content-section {
            background-color: var(--card-bg);
            margin-bottom: calc(var(--spacing-unit) * 3);
            border-radius: var(--rounded-lg);
            box-shadow: var(--shadow-md);
            padding: calc(var(--spacing-unit) * 3);
        }

        .content-section h2 {
            font-size: 2rem;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--primary-color);
        }
        
        .article-title {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
        }
        
        .article-meta {
            text-align: center;
            color: var(--text-muted-color);
            font-size: 0.9rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .article-content {
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--text-color);
        }
        
        .article-content p {
            margin-bottom: var(--spacing-unit);
        }
        
        .article-content img {
            margin: var(--spacing-unit) auto;
            border-radius: var(--rounded-lg);
            box-shadow: var(--shadow-md);
        }
        
        .article-content h3, .article-content h4 {
            margin-top: calc(var(--spacing-unit) * 2);
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .article-content ul, .article-content ol {
            margin-bottom: var(--spacing-unit);
            padding-left: calc(var(--spacing-unit) * 2);
        }

        .article-content li {
            margin-bottom: calc(var(--spacing-unit) * 0.5);
        }

        .content-section .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
            border-radius: var(--rounded-lg);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            text-align: center;
            margin-top: calc(var(--spacing-unit) * 2);
        }

        .content-section .cta-button:hover, .content-section .cta-button:focus {
            background-color: var(--primary-color);
            color: #fff;
            text-decoration: none;
            transform: translateY(-2px);
        }
        
        .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 5) 0;
            color: var(--text-muted-color);
            font-size: 1.2rem;
        }
        
        .no-content a {
            color: var(--primary-color);
            font-weight: bold;
        }

        .site-footer {
            background-color: #333;
            color: #ddd;
            padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 2);
            font-size: 0.9rem;
        }

        .site-footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: var(--spacing-unit);
        }

        .site-footer .footer-col {
            flex: 1 1 200px;
        }

        .site-footer h4 {
            color: #fff;
            margin-bottom: var(--spacing-unit);
            font-size: 1.1rem;
        }

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

        .site-footer ul li {
            margin-bottom: calc(var(--spacing-unit) * 0.5);
        }

        .site-footer ul li a {
            color: #bbb;
            transition: color 0.3s ease;
        }
        
        .site-footer ul li a:hover, .site-footer ul li a:focus {
            color: #fff;
            text-decoration: underline;
        }

        .site-footer p {
            margin-bottom: var(--spacing-unit);
            color: #bbb;
        }
        
        .site-footer p a {
            color: #bbb;
        }
        
        .site-footer p a:hover, .site-footer p a:focus {
            color: #fff;
        }

        .footer-bottom {
            text-align: center;
            padding-top: calc(var(--spacing-unit) * 2);
            margin-top: var(--spacing-unit);
            border-top: 1px solid #555;
            color: #aaa;
        }

        @media (max-width: 768px) {
            .main-nav ul {
                flex-direction: column;
                align-items: center;
                gap: 0;
            }
            .main-nav ul li {
                width: 100%;
                text-align: center;
            }
            .main-nav ul li a {
                display: block;
                padding: var(--spacing-unit);
            }
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section p {
                font-size: 1.1rem;
            }
            .content-section {
                padding: calc(var(--spacing-unit) * 2);
            }
            .content-section h2 {
                font-size: 1.8rem;
            }
            .article-title {
                font-size: 2rem;
            }
            .site-footer .container {
                flex-direction: column;
                text-align: center;
            }
            .site-footer .footer-col {
                margin-bottom: var(--spacing-unit);
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --accent-color: #ffc107;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #dee2e6;
            --card-background: #fff;
            --footer-background: #343a40;
            --footer-text-color: #e9ecef;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 0.25rem;
            --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            width: 100%;
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.2s ease-in-out;
        }

        a:hover, a:focus {
            color: #0056b3;
            text-decoration: underline;
        }

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

        .main-nav {
            background-color: var(--card-background);
            box-shadow: var(--box-shadow);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .main-nav .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .site-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--text-color);
            text-decoration: none;
        }

        .site-logo:hover {
            text-decoration: none;
            color: var(--primary-color);
        }

        .main-nav ul {
            list-style: none;
            display: flex;
        }

        .main-nav ul li {
            margin-left: calc(var(--spacing-unit) * 2);
        }

        .main-nav ul li a {
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
            color: var(--light-text-color);
            transition: color 0.2s ease-in-out;
        }

        .main-nav ul li a:hover, .main-nav ul li a:focus {
            color: var(--text-color);
            text-decoration: none;
        }

        .main-nav ul li a.active {
            color: var(--text-color);
            font-weight: bold;
        }

        .main-nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        .hero-section {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 0 calc(var(--spacing-unit) * 1.5);
        }

        .hero-content h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit);
            line-height: 1.2;
        }

        .hero-content p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            text-decoration: none;
            transition: background-color 0.2s ease-in-out, transform 0.2s ease-in-out;
            box-shadow: var(--box-shadow);
        }

        .cta-button:hover, .cta-button:focus {
            background-color: #e0a800;
            color: var(--text-color);
            text-decoration: none;
            transform: translateY(-2px);
        }

        .section {
            padding: calc(var(--spacing-unit) * 6) 0;
        }

        .section h2 {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: calc(var(--spacing-unit) * 4);
            color: var(--text-color);
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

        .content-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
            display: flex;
            flex-direction: column;
        }

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
        }

        .content-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .card-content {
            padding: calc(var(--spacing-unit) * 2);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .card-content h3 {
            font-size: 1.5rem;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
        }

        .card-content p {
            font-size: 1rem;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-unit) * 1.5;
            flex-grow: 1;
        }

        .card-content .card-link {
            font-weight: bold;
            align-self: flex-start;
            margin-top: auto;
        }

        .card-content .card-link:hover, .card-content .card-link:focus {
            text-decoration: none;
            color: var(--primary-color);
        }

        .faq-section {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 6) 0;
            margin-top: calc(var(--spacing-unit) * 6);
            border-top: 1px solid var(--border-color);
        }

        .faq-item {
            margin-bottom: var(--spacing-unit);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            overflow: hidden;
        }

        .faq-question {
            background-color: #f8f9fa;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            font-weight: 500;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background-color 0.2s ease-in-out;
        }

        .faq-question:hover {
            background-color: #e9ecef;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.2s ease-in-out;
        }

        .faq-item.active .faq-question::after {
            content: '-';
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            color: var(--light-text-color);
            display: none;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
        }

        .cta-section h2 {
            color: #fff;
            font-size: 2.2rem;
            margin-bottom: var(--spacing-unit) * 1.5;
        }

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: calc(var(--spacing-unit) * 2.5);
            opacity: 0.9;
        }

        .cta-section .cta-button {
            background-color: var(--accent-color);
            color: var(--text-color);
            border: none;
        }

        .cta-section .cta-button:hover, .cta-section .cta-button:focus {
            background-color: #e0a800;
            color: var(--text-color);
        }

        .site-footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 5) 0;
            margin-top: auto;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: calc(var(--spacing-unit) * 3);
        }

        .site-footer h4 {
            color: #fff;
            margin-bottom: var(--spacing-unit) * 1.5;
            font-size: 1.3rem;
        }

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

        .site-footer ul li {
            margin-bottom: var(--spacing-unit) * 0.8;
        }

        .site-footer ul li a {
            color: var(--footer-text-color);
            opacity: 0.9;
            transition: color 0.2s ease-in-out;
        }

        .site-footer ul li a:hover, .site-footer ul li a:focus {
            color: #fff;
            text-decoration: none;
        }

        .site-footer p {
            color: var(--footer-text-color);
            opacity: 0.9;
            margin-bottom: var(--spacing-unit) * 0.8;
        }

        .site-footer a {
            color: var(--footer-text-color);
        }

        .site-footer a:hover, .site-footer a:focus {
            color: #fff;
            text-decoration: none;
        }

        .footer-bottom {
            text-align: center;
            padding: var(--spacing-unit) 0;
            margin-top: calc(var(--spacing-unit) * 3);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
        }

        /* Mobile responsiveness */
        @media (max-width: 992px) {
            .main-nav ul {
                display: none; /* Basic mobile menu handling, expand on click in real implementation */
            }
            .site-footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 2.5rem;
            }
            .hero-content p {
                font-size: 1rem;
            }
            .section h2 {
                font-size: 2rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .hero-section {
                padding: calc(var(--spacing-unit) * 5) 0;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .cta-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --accent-color: #ffc107;
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg: #ffffff;
            --footer-bg: #343a40;
            --footer-text-color: #f8f9fa;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --radius-sm: 0.25rem;
            --radius-md: 0.5rem;
            --radius-lg: 1rem;
            --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
            --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            scroll-behavior: smooth;
        }

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-unit);
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover {
            color: #0056b3;
            text-decoration: underline;
        }

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

        .main-nav {
            background-color: var(--card-bg);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-unit) 0;
        }

        .main-nav .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .main-nav .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .main-nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
        }

        .main-nav ul li {
            margin-left: calc(var(--spacing-unit) * 2);
        }

        .main-nav ul li a {
            font-weight: 500;
            color: var(--text-color);
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .main-nav ul li a.active,
        .main-nav ul li a:hover {
            background-color: var(--primary-color);
            color: #ffffff;
            text-decoration: none;
        }

        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #ffffff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 2);
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit);
            text-shadow: 0 2px 5px rgba(0,0,0,0.3);
        }

        .hero p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            text-shadow: 0 2px 5px rgba(0,0,0,0.3);
        }

        .hero .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: 1rem 2.5rem;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .hero .cta-button:hover {
            background-color: #e0a800;
            color: var(--text-color);
            text-decoration: none;
            transform: translateY(-3px);
            box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
        }

        .content-section {
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .content-section h2 {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--primary-color);
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

        .card {
            background-color: var(--card-bg);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.15);
        }

        .card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .card-content {
            padding: calc(var(--spacing-unit) * 2);
            flex-grow: 1;
        }

        .card-content h3 {
            font-size: 1.5rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .card-content p {
            font-size: 0.95rem;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 1.5);
        }

        .card-content .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: #ffffff;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
            transition: background-color 0.3s ease;
        }

        .card-content .btn:hover {
            background-color: #0056b3;
            color: #ffffff;
            text-decoration: none;
        }

        .features-section {
            background-color: #ffffff;
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .features-section h2 {
            margin-bottom: calc(var(--spacing-unit) * 4);
        }

        .features-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: calc(var(--spacing-unit) * 4);
            align-items: center;
        }

        .features-grid .feature-item:nth-child(odd) {
            text-align: right;
        }

        .features-grid .feature-item h3 {
            font-size: 2rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .features-grid .feature-item p {
            font-size: 1rem;
            color: var(--light-text-color);
        }

        .features-grid .feature-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }

        .faq-section {
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .faq-section h2 {
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .faq-item {
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: var(--spacing-unit);
        }

        .faq-question {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--primary-color);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            color: var(--light-text-color);
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
        }
        
        .cta-section {
            background-color: var(--primary-color);
            color: #ffffff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 2);
        }

        .cta-section h2 {
            font-size: 2.8rem;
            margin-bottom: var(--spacing-unit);
            color: inherit;
        }

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            opacity: 0.9;
        }

        .cta-section .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: 1rem 3rem;
            font-size: 1.2rem;
            font-weight: 700;
            border-radius: var(--radius-lg);
            transition: transform 0.3s ease, background-color 0.3s ease;
        }

        .cta-section .cta-button:hover {
            background-color: #e0a800;
            color: var(--text-color);
            text-decoration: none;
            transform: translateY(-3px);
        }

        .site-footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 2);
            font-size: 0.9rem;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: calc(var(--spacing-unit) * 3);
        }

        .site-footer h4 {
            color: #ffffff;
            margin-bottom: var(--spacing-unit);
            font-size: 1.2rem;
        }

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

        .site-footer ul li {
            margin-bottom: 0.75rem;
        }

        .site-footer a {
            color: var(--footer-text-color);
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .site-footer a:hover {
            opacity: 1;
            color: #ffffff;
            text-decoration: none;
        }

        .site-footer p {
            margin-bottom: var(--spacing-unit);
            line-height: 1.7;
        }

        .footer-bottom {
            text-align: center;
            padding-top: calc(var(--spacing-unit) * 2);
            margin-top: calc(var(--spacing-unit) * 3);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            opacity: 0.7;
        }

        @media (max-width: 992px) {
            .main-nav .container {
                flex-wrap: wrap;
            }
            .main-nav ul {
                margin-top: var(--spacing-unit);
                flex-wrap: wrap;
                justify-content: center;
                width: 100%;
            }
            .main-nav ul li {
                margin: 0.5rem calc(var(--spacing-unit) * 1);
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .features-grid .feature-item:nth-child(odd) {
                text-align: left;
            }
            .site-footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .content-section h2 {
                font-size: 2rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .features-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .faq-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .cta-section {
                padding: calc(var(--spacing-unit) * 5) calc(var(--spacing-unit) * 2);
            }
            .cta-section h2 {
                font-size: 2.2rem;
            }
            .site-footer .container {
                grid-template-columns: 1fr;
            }
            .site-footer h4 {
                margin-top: var(--spacing-unit);
            }
        }

        @media (max-width: 576px) {
            .main-nav .logo {
                font-size: 1.5rem;
            }
            .main-nav ul li {
                margin: 0.3rem 0.5rem;
            }
            .main-nav ul li a {
                padding: 0.5rem 0.8rem;
                font-size: 0.9rem;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 5) calc(var(--spacing-unit) * 1);
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 0.95rem;
                margin-bottom: calc(var(--spacing-unit) * 2);
            }
            .hero .cta-button {
                padding: 0.8rem 2rem;
                font-size: 1rem;
            }
            .content-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .content-section h2 {
                font-size: 1.8rem;
                margin-bottom: calc(var(--spacing-unit) * 2);
            }
            .card-content {
                padding: var(--spacing-unit);
            }
            .card-content h3 {
                font-size: 1.3rem;
            }
            .features-grid {
                gap: calc(var(--spacing-unit) * 3);
            }
            .features-grid .feature-item h3 {
                font-size: 1.8rem;
            }
            .faq-question {
                padding: var(--spacing-unit) var(--spacing-unit);
            }
            .cta-section {
                padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 1);
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
            .cta-section .cta-button {
                padding: 0.8rem 2.5rem;
                font-size: 1.1rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #feca57;
            --accent-color: #48dbfb;
            --background-light: #f8f9fa;
            --background-dark: #2c3e50;
            --text-color-dark: #343a40;
            --text-color-light: #ffffff;
            --text-color-muted: #6c757d;
            --border-color: #dee2e6;
            --card-bg: #ffffff;
            --shadow-sm: 0 1px 3px rgba(0,0,0,.1);
            --shadow-md: 0 4px 6px rgba(0,0,0,.1);
            --rounded-sm: 4px;
            --rounded-md: 8px;
            --rounded-lg: 12px;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --font-size-base: 16px;
            --line-height-base: 1.6;
        }

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

        html {
            font-size: var(--font-size-base);
            line-height: var(--line-height-base);
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family-sans);
            color: var(--text-color-dark);
            background-color: var(--background-light);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.2s ease-in-out;
        }

        a:hover {
            color: #e05252;
            text-decoration: underline;
        }

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

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: var(--spacing-sm);
            font-weight: 600;
            line-height: 1.3;
        }

        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.75rem; }
        h4 { font-size: 1.5rem; }
        h5 { font-size: 1.25rem; }
        h6 { font-size: 1rem; }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .btn {
            display: inline-block;
            padding: var(--spacing-xs) var(--spacing-sm);
            border: none;
            border-radius: var(--rounded-md);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.2s ease-in-out, transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
            text-decoration: none;
            text-align: center;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: var(--text-color-light);
        }

        .btn-primary:hover {
            background-color: #e05252;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
            color: var(--text-color-light);
        }

        .btn-secondary {
            background-color: var(--secondary-color);
            color: var(--text-color-dark);
        }

        .btn-secondary:hover {
            background-color: #f1c40f;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
            color: var(--text-color-dark);
        }

        /* Navigation */
        .site-header {
            background-color: var(--card-bg);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-sm) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .main-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .main-nav .site-logo {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

        .main-nav ul {
            list-style: none;
            display: flex;
            gap: var(--spacing-md);
        }

        .main-nav ul li a {
            font-weight: 500;
            color: var(--text-color-muted);
            padding: var(--spacing-xs) 0;
            position: relative;
            transition: color 0.2s ease-in-out;
        }

        .main-nav ul li a:hover,
        .main-nav ul li a.active {
            color: var(--primary-color);
        }

        .main-nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        /* Hero Section */
        .hero-section {
            background-color: var(--background-dark);
            color: var(--text-color-light);
            background-image: url('/assets/images/backpic/back-3.webp'); /* Example background */
            background-size: cover;
            background-position: center;
            padding: var(--spacing-xl) 0;
            text-align: center;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-sm);
            color: var(--text-color-light);
        }

        .hero-content p {
            font-size: 1.25rem;
            margin-bottom: var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }

        .hero-buttons .btn {
            margin: 0 var(--spacing-xs);
        }

        /* Content Section */
        .content-section {
            padding: var(--spacing-xl) 0;
        }

        .content-section h2 {
            text-align: center;
            margin-bottom: var(--spacing-lg);
            color: var(--text-color-dark);
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-md);
        }

        .card {
            background-color: var(--card-bg);
            border-radius: var(--rounded-lg);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 12px rgba(0,0,0,.15);
        }

        .card img {
            width: 100%;
            height: 200px; /* Fixed height for consistency */
            object-fit: cover;
        }

        .card-content {
            padding: var(--spacing-md);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .card-content h3 {
            margin-top: 0;
            margin-bottom: var(--spacing-xs);
            font-size: 1.5rem;
        }

        .card-content p {
            color: var(--text-color-muted);
            margin-bottom: var(--spacing-md);
            flex-grow: 1;
        }

        .card-content .btn {
            align-self: flex-start;
        }

        /* FAQ Section */
        .faq-section {
            background-color: #e9ecef; /* Slightly different background */
            padding: var(--spacing-xl) 0;
        }

        .faq-section h2 {
            text-align: center;
            margin-bottom: var(--spacing-lg);
        }

        .faq-item {
            margin-bottom: var(--spacing-sm);
            border-radius: var(--rounded-md);
            background-color: var(--card-bg);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            padding: var(--spacing-md);
            cursor: pointer;
            font-weight: 500;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background-color 0.2s ease-in-out;
        }

        .faq-question:hover {
            background-color: #f8f9fa;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.3s ease-in-out;
        }

        .faq-item.open .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            padding: 0 var(--spacing-md);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-in-out, padding 0.3s ease-in-out;
            background-color: var(--card-bg);
            border-top: 1px solid var(--border-color);
        }

        .faq-item.open .faq-answer {
            max-height: 500px; /* Adjust as needed */
            padding: var(--spacing-md);
        }

        .faq-answer p {
            margin-bottom: 0;
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: var(--text-color-light);
            padding: var(--spacing-xl) 0;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 2.5rem;
            margin-bottom: var(--spacing-md);
        }

        .cta-section p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-lg);
            opacity: 0.9;
        }

        .cta-section .btn {
            background-color: var(--text-color-light);
            color: var(--primary-color);
            font-weight: 600;
            padding: var(--spacing-sm) var(--spacing-lg);
        }

        .cta-section .btn:hover {
            background-color: #f1f1f1;
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background-color: var(--background-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: var(--spacing-lg) 0 var(--spacing-sm);
            margin-top: auto; /* Pushes footer to the bottom */
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-lg);
        }

        .footer-col h4 {
            color: var(--text-color-light);
            margin-bottom: var(--spacing-md);
            font-size: 1.2rem;
        }

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

        .footer-col ul li {
            margin-bottom: var(--spacing-xs);
        }

        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.7);
            transition: color 0.2s ease-in-out;
        }

        .footer-col ul li a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }

        .footer-col p {
            margin-bottom: var(--spacing-sm);
        }

        .footer-col a {
            color: rgba(255, 255, 255, 0.7);
        }

        .footer-col a:hover {
            color: var(--secondary-color);
        }

        .footer-bottom {
            text-align: center;
            padding: var(--spacing-md) 0;
            margin-top: var(--spacing-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .main-nav ul {
                gap: var(--spacing-md);
            }
            .site-footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .hero-content h1 { font-size: 2.8rem; }
            .hero-content p { font-size: 1.1rem; }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .main-nav .site-logo {
                font-size: 1.5rem;
            }
            .main-nav ul {
                gap: var(--spacing-sm);
            }
            .site-footer .container {
                grid-template-columns: 1fr;
            }
            .footer-col {
                text-align: center;
            }
            .footer-col ul {
                margin-bottom: var(--spacing-md);
            }
        }

        @media (max-width: 576px) {
            .hero-section {
                min-height: 40vh;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .hero-content p {
                font-size: 1rem;
            }
            .hero-buttons .btn {
                display: block;
                margin-bottom: var(--spacing-xs);
                width: 100%;
            }
            .btn {
                padding: var(--spacing-xs) var(--spacing-sm);
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #FF6B6B; /* 热情红 */
            --secondary-color: #4ECDC4; /* 清新绿 */
            --accent-color: #45B7D1; /* 活力蓝 */
            --background-color: #F8F9FA; /* 浅灰背景 */
            --text-color: #343A40; /* 深灰文字 */
            --weak-text-color: #6C757D; /* 浅灰弱文字 */
            --border-color: #E9ECEF; /* 浅边框 */
            --card-background: #FFFFFF; /* 白色卡片背景 */
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            --transition-speed: 0.3s;
        }

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

        html, body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            scroll-behavior: smooth;
        }

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

        a:hover, a:focus {
            color: #E15A5A;
            text-decoration: underline;
        }

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

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 calc(var(--spacing-unit) * 1.5);
        }

        /* Navigation */
        .main-nav {
            background-color: #FFFFFF;
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .main-nav .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .site-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            letter-spacing: -1px;
        }
        .site-logo:hover {
            text-decoration: none;
        }

        .main-nav ul {
            list-style: none;
            display: flex;
            gap: calc(var(--spacing-unit) * 1.5);
        }

        .main-nav a {
            color: var(--text-color);
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }

        .main-nav a:hover, .main-nav a:focus {
            color: var(--primary-color);
            text-decoration: none;
        }

        .main-nav a.active {
            color: var(--primary-color);
            font-weight: bold;
        }
        
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        /* Hero Section */
        .hero-section {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            position: relative;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
        }

        .hero-section .container {
            position: relative;
            z-index: 1;
        }

        .hero-section h1 {
            font-size: 3rem;
            margin-bottom: calc(var(--spacing-unit) * 1);
            line-height: 1.2;
        }

        .hero-section p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Section Styles */
        .section {
            padding: calc(var(--spacing-unit) * 4) 0;
        }

        .section h2 {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            line-height: 1.3;
        }

        .section p {
            text-align: center;
            font-size: 1.1rem;
            color: var(--weak-text-color);
            max-width: 800px;
            margin: 0 auto calc(var(--spacing-unit) * 3);
        }

        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

        .feature-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: calc(var(--spacing-unit) * 2);
            text-align: center;
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

        .feature-card img {
            max-width: 60px;
            margin: 0 auto calc(var(--spacing-unit) * 1.5);
            border-radius: calc(var(--border-radius) * 0.5);
        }

        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: calc(var(--spacing-unit));
            color: var(--text-color);
        }

        .feature-card p {
            font-size: 1rem;
            color: var(--weak-text-color);
            text-align: left;
            margin: 0;
            line-height: 1.8;
        }

        /* Process Section */
        .process-section {
            background-color: #FFFFFF;
        }

        .process-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: calc(var(--spacing-unit) * 3);
            position: relative;
            padding-top: calc(var(--spacing-unit) * 3);
        }

        .process-list::before {
            content: '';
            position: absolute;
            top: calc(var(--spacing-unit) * 1.5);
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: calc(100% - var(--spacing-unit) * 1.5);
            background-color: var(--border-color);
        }

        .process-item {
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit) * 2);
            max-width: 700px;
            margin: 0 auto;
            position: relative;
        }

        .process-item:nth-child(odd) {
            flex-direction: row-reverse;
            text-align: right;
        }
        
        .process-item:nth-child(even) {
            flex-direction: row;
            text-align: left;
        }

        .process-item .step-number {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8rem;
            font-weight: bold;
            flex-shrink: 0;
            z-index: 2;
            box-shadow: 0 0 15px rgba(255, 107, 107, 0.4);
        }
        
        .process-item:nth-child(odd) .step-number {
             margin-left: calc(var(--spacing-unit) * 2);
        }
        .process-item:nth-child(even) .step-number {
             margin-right: calc(var(--spacing-unit) * 2);
        }

        .process-item .content {
            flex: 1;
        }

        .process-item .content h3 {
            font-size: 1.8rem;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            color: var(--text-color);
        }

        .process-item .content p {
            font-size: 1rem;
            color: var(--weak-text-color);
            text-align: left;
            margin: 0;
        }
        
        .process-item:nth-child(odd) .content p {
             text-align: right;
        }


        /* FAQ Section */
        .faq-section {
            background-color: var(--background-color);
        }

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            margin-bottom: calc(var(--spacing-unit));
        }

        .faq-item summary {
            padding: calc(var(--spacing-unit) * 1.5);
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-item summary::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary-color);
            transition: transform var(--transition-speed) ease;
        }

        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }

        .faq-item div {
            padding: 0 calc(var(--spacing-unit) * 1.5);
            padding-bottom: calc(var(--spacing-unit) * 1.5);
            color: var(--weak-text-color);
            font-size: 1rem;
            line-height: 1.8;
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .cta-section h2 {
            font-size: 2.8rem;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            color: white;
        }

        .cta-section p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .cta-button {
            display: inline-block;
            background-color: white;
            color: var(--primary-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
            font-size: 1.2rem;
            font-weight: bold;
            border-radius: 30px;
            transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, transform var(--transition-speed) ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }

        .cta-button:hover, .cta-button:focus {
            background-color: var(--accent-color);
            color: white;
            text-decoration: none;
            transform: translateY(-3px);
        }

        /* Footer */
        .site-footer {
            background-color: var(--text-color);
            color: rgba(255, 255, 255, 0.7);
            padding: calc(var(--spacing-unit) * 4) 0;
            font-size: 0.9rem;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: calc(var(--spacing-unit) * 3);
        }

        .site-footer h4 {
            color: white;
            font-size: 1.4rem;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            letter-spacing: 0.5px;
        }

        .site-footer ul {
            list-style: none;
        }

        .site-footer li {
            margin-bottom: calc(var(--spacing-unit));
        }

        .site-footer a {
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition-speed) ease;
        }

        .site-footer a:hover, .site-footer a:focus {
            color: white;
            text-decoration: underline;
        }

        .footer-bottom {
            background-color: #212529;
            padding: calc(var(--spacing-unit) * 1.5) 0;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: calc(var(--spacing-unit) * 3);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav ul {
                gap: calc(var(--spacing-unit) * 1);
            }
            .site-logo {
                font-size: 1.6rem;
            }
            .main-nav a {
                font-size: 0.95rem;
            }
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section p {
                font-size: 1.1rem;
            }
            .section h2 {
                font-size: 2.2rem;
            }
            .process-item {
                flex-direction: column;
                text-align: center !important;
                gap: var(--spacing-unit);
            }
            .process-item:nth-child(odd) {
                flex-direction: column;
            }
             .process-item:nth-child(even) {
                flex-direction: column;
            }
            .process-item .step-number {
                margin: 0 auto calc(var(--spacing-unit)) auto !important;
            }
             .process-list::before {
                 display: none;
             }
             .site-footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .main-nav .container {
                flex-wrap: wrap;
                justify-content: center;
            }
            .main-nav ul {
                width: 100%;
                justify-content: center;
                margin-top: var(--spacing-unit);
            }
            .hero-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .hero-section h1 {
                font-size: 2.2rem;
            }
            .section h2 {
                font-size: 2rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .container {
                grid-template-columns: 1fr;
            }
            .cta-section h2 {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 520px) {
            .site-logo {
                font-size: 1.4rem;
            }
            .main-nav a {
                font-size: 0.9rem;
            }
             .hero-section h1 {
                font-size: 1.8rem;
            }
            .hero-section p {
                font-size: 1rem;
            }
            .section h2 {
                font-size: 1.8rem;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2.5);
                font-size: 1.1rem;
            }
        }