/* roulang page: index */
:root {
            --primary-color: #4CAF50;
            --secondary-color: #2196F3;
            --accent-color: #FFC107;
            --background-color: #f8f9fa;
            --text-color: #333;
            --weak-text-color: #777;
            --border-color: #ddd;
            --card-background: #fff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --header-background: rgba(255, 255, 255, 0.9);
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 0.25rem;
            --box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        * {
            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);
        }

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

        a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }

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

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

        /* Header & Navigation */
        header {
            background-color: var(--header-background);
            box-shadow: var(--box-shadow);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .nav-links a {
            margin-left: calc(var(--spacing-unit) * 1.5);
            color: var(--text-color);
            font-weight: 500;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary-color);
            border-bottom: 2px solid var(--primary-color);
        }

        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            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) calc(var(--spacing-unit) * 2);
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 60vh;
        }

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

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

        .hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit);
            line-height: 1.3;
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background-color: var(--primary-color);
            color: #fff;
            transform: translateY(-2px);
            text-decoration: none;
        }

        /* Section Styling */
        section {
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        h2.section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            position: relative;
            display: inline-block;
        }

        h2.section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }

        /* Content Blocks */
        .content-block {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: calc(var(--spacing-unit) * 3);
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .content-block h3 {
            font-size: 1.8rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .content-block p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-unit);
        }

        /* Card Grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

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

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0,0,0,0.15);
        }

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

        .card-content {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
        }

        .card-content h4 {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            color: var(--text-color);
        }

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

        .card-content .tag {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: 0.3rem 0.8rem;
            border-radius: var(--border-radius);
            font-size: 0.8rem;
            margin-bottom: var(--spacing-unit);
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--secondary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 2);
        }

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

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .cta-section .btn {
            background-color: var(--accent-color);
            color: var(--text-color);
        }

        .cta-section .btn:hover {
            background-color: var(--primary-color);
            color: #fff;
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 4) 0;
            text-align: center;
            font-size: 0.9rem;
        }

        footer .container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .footer-nav {
            margin-bottom: var(--spacing-unit);
        }

        .footer-nav a {
            color: var(--footer-text-color);
            margin: 0 calc(var(--spacing-unit) * 0.5);
        }

        .footer-nav a:hover {
            color: #fff;
        }

        .copyright {
            margin-top: var(--spacing-unit);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .logo {
                font-size: 1.5rem;
            }

            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--header-background);
                padding: var(--spacing-unit);
                box-shadow: var(--box-shadow);
            }

            .nav-links a {
                margin: var(--spacing-unit) 0;
                text-align: center;
                width: 100%;
            }

            .nav-links.active {
                display: flex;
            }

            .mobile-nav-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .hero p {
                font-size: 1.1rem;
            }

            h2.section-title {
                font-size: 2rem;
            }

            .card-grid {
                grid-template-columns: 1fr;
            }

            section {
                padding: calc(var(--spacing-unit) * 3) 0;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #48dbfb;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #e0e0e0;
            --card-background: #fff;
            --button-hover-bg: #e55b5b;
            --footer-bg: #333;
            --footer-text-color: #f8f9fa;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --section-padding: calc(var(--spacing-unit) * 3);
            --border-radius: 8px;
            --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

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

        body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            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: var(--button-hover-bg);
        }

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

        header {
            background-color: var(--card-background);
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

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

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

        nav .nav-links {
            display: flex;
            gap: var(--spacing-unit) * 1.5;
        }

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

        nav .nav-links a:hover,
        nav .nav-links a.active {
            background-color: var(--primary-color);
            color: #fff;
        }

        .mobile-nav-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-color);
        }

        main {
            padding: var(--section-padding) 0;
        }

        .article-hero {
            background-color: var(--primary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 4) 0;
            text-align: center;
            margin-bottom: var(--section-padding);
            position: relative;
            overflow: hidden;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/backpic/back-1.webp'); /* Placeholder, adjust as needed */
            background-size: cover;
            background-position: center;
            opacity: 0.3;
            z-index: 0;
        }

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

        .article-hero h1 {
            font-size: 3rem;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            line-height: 1.3;
        }

        .article-hero .meta {
            font-size: 0.9rem;
            opacity: 0.8;
            margin-bottom: var(--spacing-unit) * 2;
        }

        .article-content {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 3);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        .article-content h2,
        .article-content h3 {
            margin-top: var(--spacing-unit) * 2;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
            line-height: 1.4;
        }

        .article-content h2 {
            font-size: 2rem;
        }

        .article-content h3 {
            font-size: 1.5rem;
        }

        .article-content p {
            margin-bottom: var(--spacing-unit);
        }

        .article-content img {
            margin: var(--spacing-unit) 0;
            border-radius: var(--border-radius);
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
        }

        .article-content .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
            font-size: 1.2rem;
            color: var(--light-text-color);
        }

        .article-content .no-content a {
            display: inline-block;
            margin-top: var(--spacing-unit) * 2;
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2.5);
            background-color: var(--primary-color);
            color: #fff;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease;
        }

        .article-content .no-content a:hover {
            background-color: var(--button-hover-bg);
        }

        .related-articles {
            margin-top: var(--section-padding);
        }

        .related-articles h3 {
            text-align: center;
            font-size: 2rem;
            margin-bottom: var(--spacing-unit) * 2;
            color: var(--primary-color);
        }

        .related-articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: var(--spacing-unit) * 2;
        }

        .related-article-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .related-article-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

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

        .related-article-card .content {
            padding: var(--spacing-unit) * 1.5;
        }

        .related-article-card h4 {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-unit) * 0.8;
            color: var(--text-color);
            line-height: 1.4;
        }

        .related-article-card .meta {
            font-size: 0.8rem;
            color: var(--light-text-color);
        }

        footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: var(--spacing-unit) * 3 0;
            margin-top: var(--section-padding);
            text-align: center;
        }

        footer .footer-nav {
            margin-bottom: var(--spacing-unit) * 1.5;
            display: flex;
            justify-content: center;
            gap: var(--spacing-unit) * 1.5;
            flex-wrap: wrap;
        }

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

        footer .footer-nav a:hover {
            opacity: 1;
        }

        footer .copyright {
            font-size: 0.9rem;
            opacity: 0.7;
        }

        footer .copyright .logo {
            font-weight: bold;
        }

        @media (max-width: 768px) {
            nav .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--card-background);
                padding: var(--spacing-unit) * 2;
                box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            }

            nav .nav-links.active {
                display: flex;
            }

            nav .nav-links a {
                width: 100%;
                text-align: left;
                padding: var(--spacing-unit);
                border-radius: 0;
            }

            .mobile-nav-toggle {
                display: block;
            }

            .article-hero h1 {
                font-size: 2.2rem;
            }

            .article-content {
                padding: var(--spacing-unit) * 2;
            }

            .related-articles-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #f44336; /* Red */
            --secondary-color: #ff9800; /* Orange */
            --background-color: #f8f8f8;
            --text-color: #333;
            --muted-text-color: #777;
            --border-color: #eee;
            --card-background: #fff;
            --header-bg: rgba(255, 255, 255, 0.9);
            --footer-bg: #333;
            --footer-text-color: #ccc;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --radius-sm: 4px;
            --radius-md: 8px;
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

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

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

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

        header {
            background-color: var(--header-bg);
            padding: var(--spacing-unit) 0;
            box-shadow: var(--shadow-md);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--primary-color);
            text-transform: uppercase;
        }

        nav .nav-links {
            display: flex;
            gap: calc(var(--spacing-unit) * 2);
        }

        nav .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: var(--spacing-unit) 0;
            position: relative;
        }

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

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

        nav .nav-links a:hover::after,
        nav .nav-links a.active::after {
            width: 100%;
        }

        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--text-color);
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) var(--spacing-unit);
            position: relative;
            overflow: hidden;
        }

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

        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

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

        .hero p {
            font-size: 1.2em;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .hero .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
            border-radius: var(--radius-md);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
            box-shadow: var(--shadow-md);
        }

        .hero .cta-button:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }

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

        .section-title {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 4);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) * 2);
        }

        .section-title::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
        }

        /* AI Curation Section */
        .ai-curation {
            background-color: var(--card-background);
            text-align: center;
        }

        .ai-curation .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
            margin-top: calc(var(--spacing-unit) * 4);
        }

        .ai-curation .feature-item {
            padding: calc(var(--spacing-unit) * 2);
            border-radius: var(--radius-md);
            background-color: #fff;
            box-shadow: var(--shadow-md);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
        }

        .ai-curation .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }

        .ai-curation .feature-icon {
            font-size: 3em;
            color: var(--secondary-color);
            margin-bottom: var(--spacing-unit);
        }

        .ai-curation .feature-item h3 {
            font-size: 1.5em;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .ai-curation .feature-item p {
            color: var(--muted-text-color);
        }

        /* Content Showcase Section */
        .content-showcase {
            background-color: var(--background-color);
        }

        .content-showcase .showcase-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: calc(var(--spacing-unit) * 3);
        }

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

        .content-showcase .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }

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

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

        .content-showcase .card h3 {
            font-size: 1.3em;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .content-showcase .card p {
            font-size: 0.95em;
            color: var(--muted-text-color);
            margin-bottom: var(--spacing-unit);
            flex-grow: 1;
        }

        .content-showcase .card .details {
            font-size: 0.85em;
            color: var(--muted-text-color);
            margin-top: auto; /* Push details to the bottom */
            display: flex;
            justify-content: space-between;
        }

        /* FAQ Section */
        .faq-section {
            background-color: #fff;
        }

        .faq-section .faq-list {
            max-width: 800px;
            margin: 0 auto;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            cursor: pointer;
            font-weight: bold;
            position: relative;
            transition: background-color var(--transition-speed) ease;
        }

        .faq-question:hover {
            background-color: #f9f9f9;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: calc(var(--spacing-unit) * 2);
            font-size: 1.5em;
            transition: transform var(--transition-speed) ease;
        }

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

        .faq-answer {
            padding: 0 calc(var(--spacing-unit) * 2);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
            background-color: #fefefe;
        }

        .faq-answer p {
            padding: var(--spacing-unit) 0;
            color: var(--muted-text-color);
        }

        .faq-item.active .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
        }

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

        .cta-section h2 {
            font-size: 2.2em;
            margin-bottom: var(--spacing-unit);
        }

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

        .cta-section .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 4);
            border-radius: var(--radius-md);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
            box-shadow: var(--shadow-md);
        }

        .cta-section .cta-button:hover {
            background-color: #e68a00; /* Darker orange */
            transform: translateY(-3px);
        }

        footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 4) 0;
            margin-top: auto; /* Pushes footer to the bottom */
        }

        footer .container {
            text-align: center;
        }

        .footer-nav {
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .footer-nav a {
            color: var(--footer-text-color);
            margin: 0 var(--spacing-unit);
            font-weight: 500;
        }

        .footer-nav a:hover {
            color: #fff;
        }

        .copyright {
            font-size: 0.9em;
        }

        .copyright .logo {
            color: var(--secondary-color);
            font-weight: bold;
        }

        /* Responsive Design */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .section-title {
                font-size: 2em;
            }
            .content-showcase .showcase-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            nav .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--header-bg);
                padding: var(--spacing-unit);
                box-shadow: var(--shadow-md);
            }
            nav .nav-links.active {
                display: flex;
            }
            nav .nav-links a {
                padding: var(--spacing-unit) 0;
                text-align: center;
                width: 100%;
            }
            .mobile-nav-toggle {
                display: block;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 5) var(--spacing-unit);
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 1em;
            }
            .section-title {
                font-size: 1.8em;
            }
            .content-showcase .showcase-grid {
                grid-template-columns: 1fr;
            }
            .faq-question::after {
                right: var(--spacing-unit);
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 1.5em;
            }
            .hero h1 {
                font-size: 1.8em;
            }
            .hero p {
                font-size: 0.95em;
            }
            .hero .cta-button {
                padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
                font-size: 1em;
            }
            .section-title {
                font-size: 1.6em;
                margin-bottom: calc(var(--spacing-unit) * 3);
            }
            .cta-section h2 {
                font-size: 1.8em;
            }
            .cta-section p {
                font-size: 1em;
                margin-bottom: calc(var(--spacing-unit) * 2);
            }
            .cta-section .cta-button {
                padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
                font-size: 1em;
            }
            .footer-nav a {
                display: block;
                margin: var(--spacing-unit) 0;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉红色 */
            --secondary-color: #f50057; /* 亮粉色 */
            --accent-color: #ff80ab; /* 柔和的粉色 */
            --background-color: #f8f9fa; /* 浅灰色背景 */
            --text-color: #333; /* 深灰色文字 */
            --text-muted-color: #777; /* 浅灰色文字 */
            --border-color: #e0e0e0; /* 浅灰色边框 */
            --card-background: #ffffff; /* 白色卡片背景 */
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --font-family: 'Helvetica Neue', Arial, sans-serif;
        }

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

        body {
            font-family: var(--font-family);
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            scroll-behavior: smooth;
        }

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

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: var(--spacing-unit);
            line-height: 1.4;
            font-weight: 600;
        }

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

        p {
            margin-bottom: var(--spacing-unit);
        }

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }

        header {
            background-color: var(--card-background);
            box-shadow: var(--box-shadow);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .nav-links {
            display: flex;
            gap: var(--spacing-unit) * 1.5;
        }

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

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--secondary-color);
        }

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

        .mobile-nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-color);
        }

        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: var(--spacing-unit) * 6 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: var(--spacing-unit) * 2;
            background: rgba(0, 0, 0, 0.4);
            border-radius: var(--border-radius);
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit) * 1.5;
            color: white;
        }

        .hero p {
            font-size: 1.2rem;
            color: white;
            opacity: 0.9;
            margin-bottom: var(--spacing-unit) * 3;
        }

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: var(--spacing-unit) * 1.2 var(--spacing-unit) * 2.5;
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: 0 4px 8px rgba(233, 30, 99, 0.4);
        }

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

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

        .section h2 {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: var(--spacing-unit) * 4;
            color: var(--text-color);
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-unit) * 3;
        }

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

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }

        .category-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            filter: brightness(0.9);
        }

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

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

        .category-card-content p {
            font-size: 0.95rem;
            color: var(--text-muted-color);
            margin-bottom: var(--spacing-unit) * 2;
            flex-grow: 1;
        }

        .category-card-link {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: var(--spacing-unit) * 0.8 var(--spacing-unit) * 1.5;
            border-radius: var(--border-radius);
            font-weight: bold;
            text-align: center;
            transition: background-color 0.3s ease;
            margin-top: auto; /* Push to bottom */
        }

        .category-card-link:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
        }

        .feature-section {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: var(--spacing-unit) * 4;
        }

        .feature-section h2 {
            font-size: 2rem;
            margin-bottom: var(--spacing-unit) * 3;
            text-align: left;
        }

        .feature-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--spacing-unit) * 3;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-unit) * 2;
        }

        .feature-item-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            opacity: 0.8;
            flex-shrink: 0;
        }

        .feature-item-content h4 {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-unit) * 0.5;
        }

        .feature-item-content p {
            font-size: 0.95rem;
            color: var(--text-muted-color);
        }

        .faq-section {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            padding: var(--spacing-unit) * 4;
            box-shadow: var(--box-shadow);
        }

        .faq-section h2 {
            text-align: center;
        }

        .faq-item {
            margin-bottom: var(--spacing-unit) * 2;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: var(--spacing-unit) * 2;
        }

        .faq-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .faq-question {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: color 0.3s ease;
        }

        .faq-question:hover {
            color: var(--primary-color);
        }

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

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

        .faq-answer {
            font-size: 0.95rem;
            color: var(--text-muted-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease-in-out;
        }

        .faq-item.active .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding-top: var(--spacing-unit);
        }

        footer {
            background-color: #333;
            color: #ccc;
            padding: var(--spacing-unit) * 3 0;
            text-align: center;
            margin-top: var(--spacing-unit) * 5;
        }

        .footer-nav {
            margin-bottom: var(--spacing-unit) * 2;
        }

        .footer-nav a {
            color: #ccc;
            margin: 0 var(--spacing-unit);
            transition: color 0.3s ease;
        }

        .footer-nav a:hover {
            color: white;
        }

        .copyright {
            font-size: 0.9rem;
            opacity: 0.8;
        }

        .copyright .logo {
            color: var(--secondary-color);
            font-weight: bold;
        }

        /* Responsive adjustments */
        @media (max-width: 992px) {
            .nav-links {
                gap: var(--spacing-unit) * 1;
            }
            .nav-links a {
                font-size: 0.9rem;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section h2 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px; /* Adjust based on header height */
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                padding: var(--spacing-unit) * 2;
                box-shadow: var(--box-shadow);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                text-align: center;
                padding: var(--spacing-unit);
            }
            .nav-links a.active::after {
                display: none;
            }
            .hero {
                padding: var(--spacing-unit) * 4 0;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 0.9rem;
            }
            .cta-button {
                padding: var(--spacing-unit) * 1 var(--spacing-unit) * 2;
            }
            .section {
                padding: var(--spacing-unit) * 3 0;
            }
            .section h2 {
                font-size: 1.8rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .feature-item {
                flex-direction: column;
                text-align: center;
            }
            .feature-item-icon {
                margin-bottom: var(--spacing-unit);
            }
            .faq-question {
                font-size: 1rem;
            }
            .faq-answer {
                font-size: 0.9rem;
            }
            footer {
                padding: var(--spacing-unit) * 2 0;
            }
            .footer-nav a {
                display: block;
                margin: var(--spacing-unit) 0;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #ff0066; /* 热情红 */
            --secondary-color: #00c9ff; /* 活力蓝 */
            --background-color: #1a1a1a; /* 深邃黑 */
            --text-color: #ffffff; /* 纯净白 */
            --subtle-text-color: #cccccc; /* 柔和灰 */
            --border-color: #333333; /* 暗边框 */
            --card-background: #2a2a2a; /* 暗卡片 */
            --button-hover-bg: rgba(255, 0, 102, 0.9);
            --button-hover-text: #ffffff;
            --footer-background: #111111;
            --border-radius: 8px;
            --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            --container-max-width: 1200px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --font-size-base: 16px;
            --font-size-h1: 3rem;
            --font-size-h2: 2.25rem;
            --font-size-h3: 1.75rem;
            --font-size-h4: 1.25rem;
        }

        body {
            margin: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.7;
            scroll-behavior: smooth;
        }

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

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
        }

        /* Header & Navigation */
        header {
            background-color: var(--background-color);
            padding: var(--spacing-md) 0;
            border-bottom: 1px solid var(--border-color);
        }

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

        .logo {
            font-size: var(--font-size-h3);
            font-weight: bold;
            color: var(--primary-color);
            letter-spacing: 1px;
        }

        .nav-links {
            display: flex;
            gap: var(--spacing-md);
        }

        .nav-links a {
            color: var(--subtle-text-color);
            font-weight: 500;
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .nav-links a.active,
        .nav-links a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--text-color);
        }

        .mobile-nav-toggle {
            display: none;
            font-size: 2rem;
            color: var(--text-color);
        }

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

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
        }

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

        .hero h1 {
            font-size: var(--font-size-h1);
            margin-bottom: var(--spacing-md);
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
        }

        .hero p {
            font-size: var(--font-size-h4);
            color: var(--subtle-text-color);
            max-width: 800px;
            margin: 0 auto var(--spacing-lg);
            text-shadow: 0 1px 5px rgba(0, 0, 0, 0.5);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--border-radius);
            font-size: var(--font-size-h4);
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            box-shadow: var(--box-shadow);
        }

        .cta-button:hover {
            background-color: var(--button-hover-bg);
            transform: translateY(-2px);
        }

        /* Main Content Sections */
        main {
            padding: var(--spacing-xl) 0;
        }

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

        .section h2 {
            font-size: var(--font-size-h2);
            margin-bottom: var(--spacing-md);
            position: relative;
            display: inline-block;
        }

        .section h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--primary-color);
            border-radius: 2px;
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-lg);
        }

        .content-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: left;
        }

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
        }

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

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

        .card-content h3 {
            font-size: var(--font-size-h4);
            margin-bottom: var(--spacing-sm);
            color: var(--text-color);
        }

        .card-content p {
            font-size: var(--font-size-base);
            color: var(--subtle-text-color);
            margin-bottom: var(--spacing-md);
        }

        .card-tags {
            margin-bottom: var(--spacing-md);
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }

        .tag {
            background-color: rgba(0, 201, 255, 0.1);
            color: var(--secondary-color);
            padding: 4px var(--spacing-sm);
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            padding: var(--spacing-xl) 0;
            border-radius: var(--border-radius);
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: var(--spacing-md) 0;
        }
        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            font-size: var(--font-size-h4);
            font-weight: 500;
            cursor: pointer;
            position: relative;
            padding-right: 30px;
            text-align: left;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: 0;
            font-size: 1.5rem;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-question::after {
            content: '−';
            transform: rotate(0deg);
        }

        .faq-answer {
            font-size: var(--font-size-base);
            color: var(--subtle-text-color);
            text-align: left;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            padding-top: 0;
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding-top: var(--spacing-md);
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--subtle-text-color);
            padding: var(--spacing-xl) 0;
            margin-top: var(--spacing-xl);
            text-align: center;
        }

        .footer-nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            margin-bottom: var(--spacing-md);
        }

        .footer-nav a {
            color: var(--subtle-text-color);
            font-size: var(--font-size-base);
        }

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

        .copyright {
            font-size: 0.9rem;
        }

        .copyright .logo {
            font-weight: bold;
            color: var(--primary-color);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px; /* Adjust based on header height */
                left: 0;
                width: 100%;
                background-color: var(--background-color);
                padding: var(--spacing-md) 0;
                border-top: 1px solid var(--border-color);
                z-index: 1000;
            }

            .nav-links.active {
                display: flex;
            }

            .nav-links a {
                width: 100%;
                text-align: center;
                padding: var(--spacing-md) 0;
                margin: var(--spacing-sm) 0;
            }

            .mobile-nav-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .hero p {
                font-size: 1.1rem;
            }

            .section h2 {
                font-size: 2rem;
            }

            .card-grid {
                grid-template-columns: 1fr;
            }

            .footer-nav {
                flex-direction: column;
                align-items: center;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #ff6b6b; /* 鲜艳的红色 */
            --secondary-color: #f0a500; /* 温暖的橙色 */
            --background-color: #f8f9fa; /* 浅灰色背景 */
            --text-color: #333;
            --muted-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --button-hover-bg: #e05a5a;
            --button-hover-text: #ffffff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
            --shadow-lg: 0 8px 20px rgba(0,0,0,0.15);
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            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 var(--spacing-unit);
            width: 100%;
        }

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

        a:hover {
            color: var(--button-hover-bg);
        }

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

        h1, h2, h3 {
            line-height: 1.3;
            margin-bottom: var(--spacing-unit);
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
        }

        h2 {
            font-size: 2rem;
            font-weight: 600;
        }

        h3 {
            font-size: 1.5rem;
            font-weight: 600;
        }

        p {
            margin-bottom: var(--spacing-unit);
        }

        header {
            background-color: #ffffff;
            box-shadow: var(--shadow-md);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .nav-links {
            display: flex;
            gap: calc(var(--spacing-unit) * 1.5);
        }

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .nav-links a.active {
            color: var(--primary-color);
            font-weight: 700;
        }

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

        .nav-links a:hover::after {
            width: 100%;
        }

        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 2rem;
            cursor: pointer;
            color: var(--text-color);
        }

        .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) * 8) var(--spacing-unit);
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
            overflow: hidden;
        }

        .hero::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 h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-unit);
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            text-shadow: 1px 1px 6px rgba(0,0,0,0.5);
        }

        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: 600;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            border: none;
            cursor: pointer;
            text-align: center;
        }

        .btn:hover {
            background-color: var(--button-hover-bg);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            color: var(--button-hover-text);
        }

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

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

        .content-block {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-md);
            padding: calc(var(--spacing-unit) * 3);
            margin-bottom: calc(var(--spacing-unit) * 3);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .content-block:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .content-block img {
            max-width: 150px;
            margin-bottom: var(--spacing-unit);
            border-radius: var(--border-radius);
        }

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

        .content-block p {
            color: var(--muted-text-color);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

        .feature-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-md);
            padding: calc(var(--spacing-unit) * 3);
            text-align: center;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .feature-item img {
            max-width: 100px;
            margin-bottom: var(--spacing-unit);
            opacity: 0.8;
        }

        .feature-item h3 {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
        }

        .feature-item p {
            font-size: 0.95rem;
            color: var(--muted-text-color);
        }

        .faq-section {
            background-color: #ffffff;
            padding: calc(var(--spacing-unit) * 6) 0;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: var(--spacing-unit) 0;
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            font-weight: 600;
            cursor: pointer;
            position: relative;
            padding-right: 30px;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: 0;
            font-size: 1.2rem;
            line-height: 1;
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            color: var(--muted-text-color);
            padding-top: 0;
        }

        .faq-question.active + .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding-top: var(--spacing-unit);
        }

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

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

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

        .cta-section .btn {
            background-color: white;
            color: var(--primary-color);
            font-weight: 700;
        }

        .cta-section .btn:hover {
            background-color: var(--secondary-color);
            color: white;
        }

        footer {
            background-color: #343a40;
            color: #ffffff;
            padding: calc(var(--spacing-unit) * 4) 0;
            margin-top: auto; /* Push footer to bottom */
            text-align: center;
        }

        .footer-nav {
            margin-bottom: var(--spacing-unit);
        }

        .footer-nav a {
            color: #adb5bd;
            margin: 0 calc(var(--spacing-unit) * 0.5);
            transition: color 0.3s ease;
        }

        .footer-nav a:hover {
            color: #ffffff;
        }

        .copyright {
            font-size: 0.9rem;
            color: #6c757d;
        }

        .copyright .logo {
            color: var(--primary-color);
            font-weight: 700;
        }

        /* Responsive Styles */
        @media (max-width: 992px) {
            .nav-links {
                gap: calc(var(--spacing-unit));
            }
            .hero h1 {
                font-size: 3rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: #ffffff;
                box-shadow: var(--shadow-md);
                padding: var(--spacing-unit) 0;
            }

            .nav-links a {
                padding: var(--spacing-unit) var(--spacing-unit);
                text-align: center;
                width: 100%;
            }

            .nav-links a.active {
                background-color: var(--primary-color);
                color: white;
            }

            .mobile-nav-toggle {
                display: block;
            }

            .hero {
                min-height: 45vh;
                padding: calc(var(--spacing-unit) * 5) var(--spacing-unit);
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .hero p {
                font-size: 1rem;
            }

            .section h2 {
                font-size: 2.2rem;
            }

            .cta-section h2 {
                font-size: 2.2rem;
            }
        }

/* roulang page: category5 */
:root {
            --primary-color: #ff4081;
            --secondary-color: #40c4ff;
            --background-color: #f5f5f5;
            --text-color: #333;
            --subtle-text-color: #777;
            --border-color: #e0e0e0;
            --card-background: #fff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Helvetica Neue', Arial, 'Liberation Sans', FreeSans, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            font: inherit;
        }

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

        /* Header & Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .nav-links {
            display: flex;
            gap: calc(var(--spacing-unit) * 1.5);
        }

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

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

        .nav-links a:not(.active):hover {
            color: var(--primary-color);
        }

        .mobile-nav-toggle {
            display: none;
            font-size: 1.8rem;
            color: var(--text-color);
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('/assets/images/backpic/back-3.webp') center center/cover no-repeat;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) var(--spacing-unit);
            position: relative;
        }

        .hero-content h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit);
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }

        .hero-content p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            box-shadow: var(--box-shadow);
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 16px rgba(0,0,0,0.15);
        }

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

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

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

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

        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.15);
        }

        .card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
        }

        .card-content {
            padding: calc(var(--spacing-unit) * 1.5);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .card-content h3 {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .card-content p {
            font-size: 0.95rem;
            color: var(--subtle-text-color);
            margin-bottom: var(--spacing-unit);
            flex-grow: 1;
        }

        .card-link {
            display: inline-block;
            margin-top: auto; /* Pushes button to the bottom */
            padding: 0.7rem 1.5rem;
            background-color: var(--secondary-color);
            color: #fff;
            border-radius: var(--border-radius);
            font-weight: bold;
            text-align: center;
            transition: background-color var(--transition-speed) ease;
        }

        .card-link:hover {
            background-color: var(--primary-color);
        }

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 4) 0;
            margin-top: calc(var(--spacing-unit) * 3);
        }

        .faq-section h2 {
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

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

        .faq-question {
            padding: calc(var(--spacing-unit) * 1.2);
            font-weight: bold;
            cursor: pointer;
            position: relative;
            color: var(--primary-color);
            transition: background-color var(--transition-speed) ease;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: var(--spacing-unit);
            font-size: 1.5rem;
            transition: transform var(--transition-speed) ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 calc(var(--spacing-unit) * 1.2);
            transition: max-height var(--transition-speed) ease, padding var(--transition-speed) ease;
            color: var(--subtle-text-color);
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: calc(var(--spacing-unit) * 1.2);
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 5) var(--spacing-unit);
            margin-top: calc(var(--spacing-unit) * 4);
        }

        .cta-section h2 {
            color: #fff;
            font-size: 2.5rem;
            margin-bottom: var(--spacing-unit);
        }

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            opacity: 0.9;
        }

        .cta-section .cta-button {
            background-color: var(--card-background);
            color: var(--primary-color);
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
        }

        .cta-section .cta-button:hover {
            background-color: var(--secondary-color);
            color: #fff;
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 3) 0;
            margin-top: auto; /* Pushes footer to the bottom */
            text-align: center;
        }

        .footer-nav {
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            display: flex;
            justify-content: center;
            gap: calc(var(--spacing-unit) * 1.5);
            flex-wrap: wrap;
        }

        .footer-nav a {
            color: var(--footer-text-color);
            transition: color var(--transition-speed) ease;
        }

        .footer-nav a:hover {
            color: #fff;
        }

        .copyright {
            font-size: 0.9rem;
        }

        .copyright .logo {
            color: #fff;
            font-weight: bold;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--card-background);
                padding: var(--spacing-unit) 0;
                box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            }

            .nav-links.active {
                display: flex;
            }

            .nav-links a {
                padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
                width: 100%;
                text-align: center;
            }

            .mobile-nav-toggle {
                display: block;
            }

            .hero-content h1 {
                font-size: 2.2rem;
            }

            .hero-content p {
                font-size: 1rem;
            }

            .content-section h2 {
                font-size: 1.8rem;
            }

            .card-grid {
                grid-template-columns: 1fr;
            }

            .cta-section h2 {
                font-size: 1.8rem;
            }

            .footer-nav {
                flex-direction: column;
                gap: var(--spacing-unit);
            }
        }