/* roulang page: index */
:root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --background-color: #f8f9fa;
            --text-color: #333;
            --weak-text-color: #666;
            --border-color: #dee2e6;
            --border-radius: 5px;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
        }

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

        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;
        }

        button {
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        header {
            background-color: #ffffff;
            padding: var(--spacing-md) 0;
            box-shadow: var(--shadow-sm);
            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;
        }

        .logo span {
            color: var(--secondary-color);
        }

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

        .nav-links li {
            margin-left: var(--spacing-lg);
        }

        .nav-links a {
            font-weight: 500;
            color: var(--text-color);
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #ffffff;
            text-align: center;
            padding: var(--spacing-lg) var(--spacing-md);
            min-height: 60vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            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-sm);
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.4rem;
            margin-bottom: var(--spacing-md);
        }

        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: #ffffff !important;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: 500;
            text-decoration: none;
            transition: background-color 0.3s ease, transform 0.3s ease;
            border: none;
        }

        .btn:hover, .btn:focus {
            background-color: #0056b3;
            transform: translateY(-2px);
            color: #ffffff;
            text-decoration: none;
        }

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

        .btn-secondary:hover, .btn-secondary:focus {
            background-color: #5a6268;
        }

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

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: var(--spacing-md);
            position: relative;
            padding-bottom: var(--spacing-sm);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 3px;
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: var(--weak-text-color);
            margin-bottom: var(--spacing-lg);
        }

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

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

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.2);
        }

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

        .content-card-body {
            padding: var(--spacing-md);
            flex-grow: 1;
        }

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

        .content-card-body p {
            font-size: 0.95rem;
            color: var(--weak-text-color);
            margin-bottom: var(--spacing-md);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .content-card-footer {
            padding: 0 var(--spacing-md) var(--spacing-md) var(--spacing-md);
            margin-top: auto;
        }

        .content-card-footer span {
            font-size: 0.85rem;
            color: var(--weak-text-color);
            margin-right: var(--spacing-sm);
        }

        /* Features Section */
        .features {
            background-color: #ffffff;
        }

        .feature-item {
            text-align: center;
            padding: var(--spacing-md);
        }

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

        .feature-item h4 {
            font-size: 1.4rem;
            margin-bottom: var(--spacing-sm);
        }

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

        /* Categories Section */
        .categories {
            background-color: #f4f4f4;
        }

        .category-card {
            background-color: #ffffff;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-md);
            text-align: center;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }

        .category-card img {
            max-width: 80px;
            margin: 0 auto var(--spacing-sm);
        }

        .category-card h4 {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-sm);
        }

        .category-card p {
            font-size: 0.9rem;
            color: var(--weak-text-color);
        }

        /* FAQ Section */
        .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: 1.2rem;
            font-weight: 500;
            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;
            font-weight: bold;
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            font-size: 1rem;
            color: var(--weak-text-color);
            margin-top: var(--spacing-sm);
        }

        /* CTA Section */
        .cta {
            background-color: var(--primary-color);
            color: #ffffff;
            text-align: center;
            padding: var(--spacing-lg) var(--spacing-md);
        }

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

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

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

        .cta .btn:hover, .cta .btn:focus {
            background-color: #e9ecef;
            color: #003f88;
        }

        footer {
            background-color: #333;
            color: #ffffff;
            padding: var(--spacing-lg) 0;
            text-align: center;
            font-size: 0.9rem;
        }

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

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

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0 0 var(--spacing-md) 0;
            display: flex;
        }

        .footer-links li {
            margin: 0 var(--spacing-sm);
        }

        .footer-links a {
            color: #ffffff;
            transition: color 0.3s ease;
        }

        .footer-links a:hover, .footer-links a:focus {
            color: var(--primary-color);
        }

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

        /* Mobile Responsiveness */
        @media (max-width: 768px) {
            .nav-links {
                display: none; /* Simple mobile nav, might need a burger menu for production */
            }

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

            .hero p {
                font-size: 1.2rem;
            }

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

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

            .container {
                width: 95%;
            }

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

/* roulang page: article */
:root {
            --primary-color: #e6007e;
            --secondary-color: #00b0f0;
            --accent-color: #ffcc00;
            --background-color: #f4f7f6;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --footer-background: #2a2a2a;
            --footer-text-color: #aaa;
            --heading-font: 'Microsoft YaHei', 'Arial', sans-serif;
            --body-font: 'Microsoft YaHei', 'Arial', sans-serif;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --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: var(--body-font);
            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) * 1.5);
        }

        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;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--heading-font);
            font-weight: 700;
            margin-bottom: var(--spacing-unit);
            line-height: 1.3;
        }

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

        .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.6);
            background-color: var(--primary-color);
            color: #fff;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            text-align: center;
        }

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

        .btn-secondary {
            background-color: var(--secondary-color);
        }
        .btn-secondary:hover {
            background-color: var(--primary-color);
        }

        header {
            background-color: #fff;
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo {
            font-size: 1.8em;
            font-weight: 900;
            color: var(--text-color);
        }
        .logo span {
            color: var(--primary-color);
        }

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

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

        .nav-links a {
            font-weight: 600;
            font-size: 1.1em;
            color: var(--light-text-color);
            padding: var(--spacing-unit) 0;
            position: relative;
            transition: color var(--transition-speed) ease;
        }

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

        .nav-links a.active::after,
        .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        .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) 0;
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 3em;
            margin-bottom: var(--spacing-unit);
        }
        .hero p {
            font-size: 1.3em;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

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

        .content-section h2 {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            font-size: 2.2em;
        }

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

        .article-content h3 {
            font-size: 1.8em;
            margin-bottom: var(--spacing-unit);
        }

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

        .article-content img {
            margin: calc(var(--spacing-unit) * 1.5) auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }

        .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
        }
        .no-content h2 {
            font-size: 2em;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-unit);
        }
        .no-content p {
            font-size: 1.2em;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

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

        .footer-logo {
            font-size: 1.8em;
            font-weight: 900;
            margin-bottom: var(--spacing-unit);
        }
        .footer-logo span {
            color: var(--accent-color); /* Use accent color for footer logo span */
        }

        .footer-links {
            list-style: none;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .footer-links li {
            margin: 0 calc(var(--spacing-unit) * 1.5);
        }

        .footer-links a {
            color: var(--footer-text-color);
            font-weight: 500;
            transition: color var(--transition-speed) ease;
        }

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

        .footer-text {
            font-size: 0.9em;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-links {
                display: none; /* Simplified for this example, typically would use a mobile menu toggle */
            }
            nav {
                justify-content: center;
            }
            .logo {
                font-size: 1.6em;
            }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2em; }
            h2 { font-size: 1.75em; }
            .hero { padding: calc(var(--spacing-unit) * 6) 0; }
            .hero h1 { font-size: 2.5em; }
            .hero p { font-size: 1.1em; }
            .content-section { padding: calc(var(--spacing-unit) * 3) 0; }
            .content-section h2 { font-size: 1.8em; }
            .article-content { padding: calc(var(--spacing-unit) * 2); }
            .footer-links li { margin: 0 calc(var(--spacing-unit) * 1); }
        }

/* roulang page: category1 */
:root {
            --primary-color: #e91e63;
            --secondary-color: #f06292;
            --accent-color: #ffc107;
            --background-color: #f8f9fa;
            --text-color: #333;
            --text-muted-color: #666;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --border-radius: 8px;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
        }

        *,
        *::before,
        *::after {
            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);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

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

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

        .container {
            width: 100%;
            max-width: var(--container-max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--spacing-md);
            padding-right: var(--spacing-md);
        }

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

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

        .logo {
            font-size: 1.8em;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

        .logo span {
            color: var(--accent-color);
        }

        .nav-links {
            list-style: none;
            display: flex;
            gap: var(--spacing-lg);
        }

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

        .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%;
        }

        .nav-links a.active::after {
            width: 100%;
            background-color: var(--primary-color);
        }

        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #ffffff;
            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, 0.5);
        }

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

        .hero h1 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-sm);
            text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
        }

        .hero p {
            font-size: 1.2em;
            margin-bottom: var(--spacing-md);
            text-shadow: 1px 1px 4px rgba(0,0,0,0.7);
        }

        .btn {
            display: inline-block;
            padding: var(--spacing-sm) var(--spacing-lg);
            background-color: var(--accent-color);
            color: var(--text-color);
            font-weight: 700;
            border-radius: var(--border-radius);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            cursor: pointer;
            font-size: 1.1em;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            background-color: #e0a800;
        }

        main {
            flex-grow: 1;
            padding: var(--spacing-xl) 0;
        }

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

        .section h2 {
            font-size: 2em;
            text-align: center;
            margin-bottom: var(--spacing-lg);
            color: var(--primary-color);
        }

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

        .card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            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 8px 16px rgba(0, 0, 0, 0.15);
        }

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

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

        .card-content h3 {
            font-size: 1.4em;
            margin-bottom: var(--spacing-sm);
            color: var(--primary-color);
        }

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

        .card-content .btn-card {
            display: block;
            width: 100%;
            text-align: center;
            background-color: var(--secondary-color);
            color: white;
            padding: var(--spacing-sm);
            border-radius: calc(var(--border-radius) / 2);
            font-weight: 700;
            transition: background-color 0.3s ease;
        }

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

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

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

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

        .cta-section .btn {
            background-color: var(--accent-color);
            color: var(--text-color);
            font-size: 1.2em;
            padding: var(--spacing-sm) var(--spacing-xl);
        }

        .cta-section .btn:hover {
            background-color: #e0a800;
        }

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

        .faq-section h2 {
            color: var(--primary-color);
        }

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

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-md);
            cursor: pointer;
            font-weight: 700;
            color: var(--primary-color);
        }

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

        .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-out, padding 0.3s ease-out;
            color: var(--text-muted-color);
        }

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

        footer {
            background-color: #343a40;
            color: #ffffff;
            padding: var(--spacing-xl) 0;
            margin-top: auto;
            text-align: center;
        }

        .footer-logo {
            font-size: 2em;
            font-weight: 700;
            margin-bottom: var(--spacing-md);
            color: var(--accent-color);
        }

        .footer-logo span {
            color: var(--primary-color);
        }

        .footer-links {
            list-style: none;
            display: flex;
            justify-content: center;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .footer-links a {
            color: #ffffff;
            font-weight: 500;
        }

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

        .footer-text {
            font-size: 0.9em;
            color: rgba(255, 255, 255, 0.7);
        }

        /* Responsive Styles */
        @media (max-width: 992px) {
            .nav-links {
                gap: var(--spacing-md);
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .card-grid {
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            }
        }

        @media (max-width: 768px) {
            nav {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
            .nav-links {
                flex-direction: column;
                align-items: center;
                margin-top: var(--spacing-md);
                gap: var(--spacing-sm);
            }
            .hero h1 {
                font-size: 2.2em;
            }
            .hero p {
                font-size: 1em;
            }
            .section h2 {
                font-size: 1.8em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .footer-links {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
        }

        @media (max-width: 576px) {
            .container {
                padding-left: var(--spacing-sm);
                padding-right: var(--spacing-sm);
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 0.95em;
            }
            .cta-section h2 {
                font-size: 1.8em;
            }
            .cta-section p {
                font-size: 1em;
            }
        }

/* roulang page: category2 */
/* Design Variables */
        :root {
            --primary-color: #e91e63; /* Pinkish Red */
            --secondary-color: #f50057; /* Deep Pink */
            --accent-color: #ff4081; /* Light Pink */
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #ddd;
            --card-background: #fff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --hero-overlay-color: rgba(0, 0, 0, 0.5);
        }

        /* Basic Reset & Base Styles */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, 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 0.3s ease;
        }

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

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

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

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

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

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

        .logo {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
        }

        .logo span {
            color: var(--secondary-color);
        }

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

        .nav-links li a {
            font-weight: 500;
            color: var(--text-color);
            padding: 8px 15px;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
            text-decoration: none;
        }

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

        .nav-links li a.active {
            background-color: var(--secondary-color);
            color: #fff;
            font-weight: bold;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: var(--spacing-unit) * 5 0;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--hero-overlay-color);
        }

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

        .hero h1 {
            font-size: 36px;
            margin-bottom: var(--spacing-unit) * 0.5;
        }

        .hero p {
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto;
            color: rgba(255, 255, 255, 0.9);
        }

        /* Section Styling */
        section {
            padding: var(--spacing-unit) * 3 0;
        }

        h2.section-title {
            text-align: center;
            font-size: 32px;
            margin-bottom: var(--spacing-unit) * 2;
            position: relative;
            display: inline-block;
        }

        h2.section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

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

        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

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

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

        .card-title {
            font-size: 20px;
            font-weight: bold;
            margin-bottom: var(--spacing-unit) * 0.5;
            color: var(--text-color);
        }

        .card-description {
            font-size: 15px;
            color: var(--light-text-color);
            flex-grow: 1;
            margin-bottom: var(--spacing-unit);
        }

        .card-link {
            display: inline-block;
            margin-top: auto; /* Pushes the link to the bottom */
            font-weight: 500;
            color: var(--secondary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .card-link:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }

        /* CTA Section */
        .cta {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: var(--spacing-unit) * 4 0;
            position: relative;
            overflow: hidden;
        }

        .cta h2 {
            font-size: 30px;
            margin-bottom: var(--spacing-unit);
        }

        .cta p {
            font-size: 18px;
            max-width: 600px;
            margin: 0 auto var(--spacing-unit) * 2;
            opacity: 0.9;
        }

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: var(--spacing-unit) * 1.2 var(--spacing-unit) * 2.5;
            border-radius: var(--border-radius);
            font-size: 18px;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            text-decoration: none;
        }

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

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

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: var(--spacing-unit) * 1.5 0;
        }

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

        .faq-question {
            font-size: 18px;
            font-weight: 500;
            cursor: pointer;
            position: relative;
            padding-left: 30px;
            margin-bottom: var(--spacing-unit) * 0.5;
        }

        .faq-question::before,
        .faq-question::after {
            content: '';
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 15px;
            height: 2px;
            background-color: var(--primary-color);
            transition: transform 0.3s ease;
        }

        .faq-question::before {
            left: 0;
        }

        .faq-question::after {
            left: 7px;
            transform: translateY(-50%) rotate(90deg);
        }

        .faq-item.open .faq-question::after {
            transform: translateY(-50%) rotate(180deg);
        }

        .faq-answer {
            font-size: 15px;
            color: var(--light-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding-left: 30px;
        }

        .faq-item.open .faq-answer {
            max-height: 150px; /* Adjust as needed */
            padding-top: var(--spacing-unit) * 0.5;
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: var(--spacing-unit) * 3 0;
            text-align: center;
        }

        .footer-logo {
            font-size: 26px;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
            color: var(--accent-color);
        }

        .footer-logo span {
            color: #fff;
        }

        .footer-links {
            list-style: none;
            display: flex;
            justify-content: center;
            gap: var(--spacing-unit) * 1.5;
            margin-bottom: var(--spacing-unit) * 2;
            flex-wrap: wrap;
        }

        .footer-links li a {
            color: var(--footer-text-color);
            transition: color 0.3s ease;
        }

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

        .footer-text {
            font-size: 14px;
            opacity: 0.8;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            nav ul.nav-links {
                display: none; /* Hide desktop nav on mobile */
            }

            .hero h1 {
                font-size: 30px;
            }

            .hero p {
                font-size: 16px;
            }

            h2.section-title {
                font-size: 28px;
            }

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

            .cta h2 {
                font-size: 26px;
            }

            .cta p {
                font-size: 16px;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #f0f0f0;
            --accent-color: #4ecdc4;
            --background-color: #ffffff;
            --text-color: #333333;
            --text-muted: #777777;
            --border-color: #dddddd;
            --card-bg: #ffffff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --radius-small: 4px;
            --radius-medium: 8px;
            --radius-large: 16px;
            --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.1);
        }

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

        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.7;
            background-color: var(--background-color);
            color: var(--text-color);
            scroll-behavior: smooth;
        }

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

        a:hover, a:focus {
            color: #e05a5a;
            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);
        }

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: calc(var(--spacing-unit) * 0.75);
            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; }

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

        .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
            border: none;
            border-radius: var(--radius-medium);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }

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

        .btn-primary:hover, .btn-primary:focus {
            background-color: #e05a5a;
            color: white;
            transform: translateY(-2px);
            box-shadow: var(--shadow-light);
        }

        .btn-secondary {
            background-color: var(--secondary-color);
            color: var(--text-color);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover, .btn-secondary:focus {
            background-color: var(--border-color);
            color: var(--text-color);
            transform: translateY(-2px);
            box-shadow: var(--shadow-light);
        }

        /* Header */
        header {
            background-color: var(--background-color);
            padding: calc(var(--spacing-unit) * 0.75) 0;
            box-shadow: var(--shadow-light);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .logo span {
            color: var(--text-color);
        }

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

        nav ul.nav-links li {
            margin-left: calc(var(--spacing-unit) * 1.5);
        }

        nav ul.nav-links li a {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-color);
            padding: 0.5rem 0;
            position: relative;
        }

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

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

        nav ul.nav-links li a:hover::after,
        nav ul.nav-links li a:focus::after {
            width: 100%;
        }

        /* Hero Section */
        .hero {
            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) * 5) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

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

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

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: calc(var(--spacing-unit) * 0.75);
            text-shadow: 0 4px 16px rgba(0,0,0,0.4);
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            text-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

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

        .section-title {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            font-size: 2.2rem;
            font-weight: 700;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        /* 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-bg);
            border-radius: var(--radius-large);
            box-shadow: var(--shadow-medium);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.16);
        }

        .card-image {
            width: 100%;
            height: 200px;
            overflow: hidden;
            border-top-left-radius: var(--radius-large);
            border-top-right-radius: var(--radius-large);
            position: relative;
        }
        
        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

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

        .card-content h3 {
            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(--text-muted);
            margin-bottom: var(--spacing-unit);
        }

        .card-tags {
            margin-bottom: var(--spacing-unit);
        }

        .card-tags span {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--text-muted);
            padding: 0.3rem 0.8rem;
            border-radius: var(--radius-small);
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }

        .card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: auto;
            padding-top: var(--spacing-unit);
        }

        .card-footer .btn {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
        }

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

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

        .cta-section p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2.5);
        }

        .cta-section .btn-primary {
            background-color: white;
            color: var(--primary-color);
            font-size: 1.1rem;
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
        }

        .cta-section .btn-primary:hover, .cta-section .btn-primary:focus {
            background-color: var(--secondary-color);
            color: var(--primary-color);
        }
        
        /* FAQ Section */
        .faq-section {
            background-color: var(--secondary-color);
        }

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

        .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;
            position: relative;
        }

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

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

        .faq-answer {
            padding: 0 calc(var(--spacing-unit) * 1.5);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 0.95rem;
            color: var(--text-muted);
        }

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

        /* Footer */
        footer {
            background-color: #1e1e1e;
            color: #cccccc;
            padding: calc(var(--spacing-unit) * 3) 0;
            text-align: center;
            font-size: 0.9rem;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

        .footer-logo span {
            color: white;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
        }

        .footer-links li {
            display: inline-block;
            margin: 0 calc(var(--spacing-unit) * 0.75);
        }

        .footer-links a {
            color: #cccccc;
            transition: color 0.3s ease;
        }

        .footer-links a:hover, .footer-links a:focus {
            color: var(--primary-color);
            text-decoration: underline;
        }

        .footer-text {
            color: #999999;
            margin-bottom: 0;
        }

        /* Responsive */
        @media (max-width: 992px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .hero h1 { font-size: 2.8rem; }
            .hero p { font-size: 1.1rem; }
            .section-title { font-size: 2rem; }

            nav ul.nav-links {
                display: none; /* Hidden on mobile, replace with mobile menu button */
            }
            
            .container header nav {
                justify-content: space-between;
                width: 100%;
            }

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

        @media (max-width: 768px) {
            .hero {
                padding: calc(var(--spacing-unit) * 4) 0;
                min-height: 50vh;
            }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .section { padding: calc(var(--spacing-unit) * 3) 0; }
            .section-title { font-size: 1.8rem; margin-bottom: calc(var(--spacing-unit) * 2); }
            .cta-section h2 { font-size: 2.2rem; }
            .cta-section p { font-size: 1.1rem; margin-bottom: calc(var(--spacing-unit) * 2); }
            .card-content { padding: var(--spacing-unit); }
            .card-content h3 { font-size: 1.15rem; }
            .card-content p { font-size: 0.9rem; }
            .card-footer .btn { font-size: 0.85rem; padding: 0.4rem 1rem;}
            footer { padding: calc(var(--spacing-unit) * 2) 0; }
        }

        @media (max-width: 576px) {
            .logo { font-size: 1.5rem; }
            .btn { padding: 0.6rem 1.2rem; font-size: 0.9rem;}
            .hero { padding: calc(var(--spacing-unit) * 3) 0; min-height: 40vh; }
            .hero h1 { font-size: 1.8rem; }
            .hero p { font-size: 1rem; margin-bottom: calc(var(--spacing-unit) * 1.5); }
            .cta-section h2 { font-size: 1.8rem; }
            .cta-section p { font-size: 1rem; }
            .cta-section .btn-primary { font-size: 1rem; padding: 0.8rem 1.5rem; }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e91e63; /* Pink/Red */
            --secondary-color: #ffc107; /* Amber */
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --text-muted-color: #6c757d;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --button-hover-bg: #d81b60;
            --button-active-bg: #c2185b;
            --nav-hover-bg: #f0f0f0;
            --nav-active-color: #e91e63;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --transition-fast: 0.2s ease-in-out;
        }

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

        html {
            scroll-behavior: smooth;
        }

        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 var(--transition-fast);
        }

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

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

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: calc(var(--spacing-unit) * 0.75);
            line-height: 1.3;
            color: var(--text-color);
        }

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

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

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

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

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

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

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

        .nav-links li a {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-muted-color);
            padding: 0.5rem 0;
            position: relative;
            transition: color var(--transition-fast);
        }

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

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

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

        /* Hero Section */
        .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) 0;
            position: relative;
        }

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

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

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

        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
        }

        /* Card Section */
        .card-section {
            background-color: var(--background-color);
        }

        .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 var(--transition-fast), box-shadow var(--transition-fast);
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }

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

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

        .card-title {
            font-size: 1.4rem;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            color: var(--primary-color);
        }

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

        .card-link {
            display: inline-block;
            margin-top: auto; /* Push to bottom */
            padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 1);
            background-color: var(--primary-color);
            color: white;
            border-radius: calc(var(--border-radius) / 2);
            text-align: center;
            font-weight: 500;
            transition: background-color var(--transition-fast);
        }

        .card-link:hover {
            background-color: var(--button-hover-bg);
            color: white;
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
        }

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

        .cta-section p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            opacity: 0.9;
        }

        .cta-button {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            background-color: var(--secondary-color);
            color: var(--text-color);
            border-radius: var(--border-radius);
            font-size: 1.3rem;
            font-weight: bold;
            transition: background-color var(--transition-fast), transform var(--transition-fast);
        }

        .cta-button:hover {
            background-color: var(--secondary-color); /* Use specific hover if needed */
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
        }

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

        .faq-list {
            list-style: none;
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            margin-bottom: calc(var(--spacing-unit) * 1.5);
        }

        .faq-question {
            background-color: var(--card-background);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            font-size: 1.2rem;
            font-weight: 600;
            cursor: pointer;
            position: relative;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-fast);
        }

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

        .faq-item.open .faq-question {
            background-color: var(--nav-hover-bg);
            border-bottom-left-radius: 0;
            border-bottom-right-radius: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            background-color: var(--card-background);
            border-bottom-left-radius: var(--border-radius);
            border-bottom-right-radius: var(--border-radius);
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
        }

        .faq-answer p {
            font-size: 1rem;
            color: var(--text-muted-color);
        }

        /* Footer */
        footer {
            background-color: #343a40;
            color: rgba(255, 255, 255, 0.7);
            padding: calc(var(--spacing-unit) * 3) 0;
            margin-top: auto; /* Push to bottom */
            text-align: center;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            margin-bottom: var(--spacing-unit);
        }
        .footer-logo span {
            color: var(--secondary-color);
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin-bottom: var(--spacing-unit) * 1.5;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: calc(var(--spacing-unit) * 1.5);
        }

        .footer-links li a {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1rem;
        }

        .footer-links li a:hover {
            color: white;
        }

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

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                gap: var(--spacing-unit);
            }
            .nav-links li a {
                font-size: 1rem;
            }
            h1 { font-size: 2.2rem; }
            .hero h1 { font-size: 2.8rem; }
            .hero p { font-size: 1.2rem; }
            .section-title { font-size: 1.8rem; }
            .cta-section h2 { font-size: 2.2rem; }
        }

        @media (max-width: 768px) {
            header .container {
                flex-direction: column;
                gap: var(--spacing-unit);
            }
            nav {
                width: 100%;
                display: flex;
                justify-content: center;
            }
            .nav-links {
                flex-direction: column;
                align-items: center;
                margin-top: var(--spacing-unit);
            }
            .hero {
                padding: calc(var(--spacing-unit) * 5) 0;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .cta-section h2 {
                font-size: 2rem;
            }
            .cta-section p {
                font-size: 1.1rem;
            }
            .cta-button {
                padding: 0.8rem 1.8rem;
                font-size: 1.1rem;
            }
        }

        @media (max-width: 576px) {
            :root {
                --spacing-unit: 12px;
            }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .section-title { font-size: 1.6rem; }
            .card-content { padding: var(--spacing-unit); }
            .card-title { font-size: 1.3rem; }
            .card-description { font-size: 0.9rem; }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
            .cta-button {
                padding: 0.7rem 1.5rem;
                font-size: 1rem;
            }
            .footer-links {
                flex-direction: column;
                gap: calc(var(--spacing-unit) / 2);
            }
        }