/* roulang page: index */
:root {
            --primary-color: #d9363e; /* Reddish tone */
            --secondary-color: #333; /* Dark gray */
            --background-color: #f4f4f4;
            --text-color: #333;
            --weak-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
            --border-radius: 8px;
            --spacing-unit: 16px;
        }

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

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

        .container {
            width: 90%;
            max-width: 1200px;
            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(--secondary-color);
        }

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

        button, input, textarea {
            font-family: inherit;
            color: inherit;
        }

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

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

        .site-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--primary-color);
            letter-spacing: -1px;
        }
        .site-logo span {
            color: var(--secondary-color);
        }

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

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

        .main-nav a {
            color: var(--secondary-color);
            font-weight: 600;
            padding: 0.5em 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

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

        /* Mobile Menu Toggle (Hidden on Desktop) */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--secondary-color);
        }

        /* Hero Section */
        .hero-section {
            background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), 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;
            margin-bottom: calc(var(--spacing-unit) * 4);
        }

        .hero-section h1 {
            font-size: 3.5em;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            font-weight: 700;
            letter-spacing: -1px;
        }

        .hero-section p {
            font-size: 1.3em;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: calc(var(--spacing-unit) * 2);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .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: 1.2em;
            font-weight: 700;
            transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: var(--hover-shadow);
        }

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

        .section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--secondary-color);
            font-weight: 700;
        }

        .section-subheading {
            text-align: center;
            font-size: 1.2em;
            color: var(--weak-text-color);
            margin-bottom: calc(var(--spacing-unit) * 3);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .content-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--card-shadow);
            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: var(--hover-shadow);
        }

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

        .card-content {
            padding: var(--spacing-unit);
            flex-grow: 1; /* Allows content to take available space */
        }

        .card-title {
            font-size: 1.4em;
            font-weight: 700;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            color: var(--secondary-color);
            display: -webkit-box;
            -webkit-line-clamp: 2; /* Limit to 2 lines */
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .card-excerpt {
            font-size: 0.95em;
            color: var(--weak-text-color);
            margin-bottom: var(--spacing-unit);
            display: -webkit-box;
            -webkit-line-clamp: 3; /* Limit to 3 lines */
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .card-meta {
            font-size: 0.85em;
            color: var(--weak-text-color);
            margin-top: auto; /* Pushes meta to the bottom */
            padding-top: var(--spacing-unit);
        }

        /* Featured Content Section */
        .featured-section {
            background-color: #fff; /* White background for contrast */
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .featured-section .container {
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit) * 4);
            flex-wrap: wrap; /* Allow wrapping on smaller screens */
        }

        .featured-image {
            flex: 1 1 400px; /* Flexible sizing */
            position: relative;
        }

        .featured-image img {
            border-radius: var(--border-radius);
            box-shadow: var(--card-shadow);
        }

        .featured-content {
            flex: 1 1 500px; /* Flexible sizing */
            padding-right: var(--spacing-unit);
        }

        .featured-content h3 {
            font-size: 2em;
            color: var(--secondary-color);
            margin-bottom: calc(var(--spacing-unit));
            font-weight: 700;
        }

        .featured-content p {
            font-size: 1.1em;
            color: var(--weak-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        /* Categories Section */
        .categories-section {
            padding: calc(var(--spacing-unit) * 4) 0;
            background-color: var(--card-background); /* Light background */
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
            text-align: center;
        }

        .category-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--card-shadow);
            padding: calc(var(--spacing-unit) * 2);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

        .category-item .icon { /* Placeholder for future icons */
            font-size: 2.5em;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

        .category-item a {
            font-size: 1.3em;
            font-weight: 700;
            color: var(--secondary-color);
        }
        .category-item a:hover {
            color: var(--primary-color);
        }


        /* FAQ Section */
        .faq-section {
            padding: calc(var(--spacing-unit) * 5) 0;
            background-color: #fff;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

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

        .faq-question {
            font-size: 1.2em;
            font-weight: 700;
            color: var(--secondary-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: relative;
            padding-right: 25px; /* Space for icon */
        }

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

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

        .faq-answer {
            font-size: 1em;
            color: var(--weak-text-color);
            margin-top: var(--spacing-unit);
            padding-left: 10px; /* Indent answer */
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease-out;
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed, or use a JS-based height calculation */
        }

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

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

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

        .cta-section .cta-button {
            background-color: var(--secondary-color);
            border: 2px solid #fff;
        }

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

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

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

        .footer-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--primary-color);
            letter-spacing: -1px;
            margin-bottom: var(--spacing-unit);
        }
        .footer-logo span {
            color: #fff;
        }

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

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

        .footer-nav a {
            color: rgba(255, 255, 255, 0.7);
            transition: color 0.3s ease;
        }

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

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

        .footer-copyright a {
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-copyright a:hover {
            color: #fff;
        }


        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .container {
                width: 95%;
            }

            .hero-section h1 {
                font-size: 2.5em;
            }

            .hero-section p {
                font-size: 1.1em;
            }

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

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

            .featured-section .container {
                flex-direction: column;
                text-align: center;
            }

            .featured-content {
                padding-right: 0;
                margin-top: var(--spacing-unit) * 2;
            }

            .mobile-menu-toggle {
                display: block; /* Show on mobile */
            }

            .main-nav {
                display: none; /* Hide desktop nav on mobile */
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: var(--card-shadow);
                padding: var(--spacing-unit) 0;
            }

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

            .main-nav li {
                margin: var(--spacing-unit) 0;
            }

            .main-nav.active {
                display: block; /* Show mobile menu when active */
            }

            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav li {
                margin: var(--spacing-unit) 0;
            }
        }

        @media (max-width: 480px) {
            .hero-section {
                padding: calc(var(--spacing-unit) * 6) 0;
            }
            .hero-section h1 {
                font-size: 2em;
            }
            .hero-section p {
                font-size: 1em;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
                font-size: 1.1em;
            }
            .section h2 {
                font-size: 1.8em;
            }
            .faq-question {
                font-size: 1.1em;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #e91e63;
            --secondary-color: #f50057;
            --accent-color: #ff80ab;
            --background-color: #ffffff;
            --text-color: #333333;
            --light-text-color: #777777;
            --border-color: #e0e0e0;
            --card-background: #f9f9f9;
            --footer-background: #212121;
            --footer-text-color: #eeeeee;
            --border-radius: 8px;
            --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.1);
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
        }

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

        body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

        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;
        }

        .btn {
            display: inline-block;
            padding: var(--spacing-sm) var(--spacing-md);
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
            text-align: center;
        }

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

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

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

        .btn-secondary:hover {
            background-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }
        
        /* Header & Navigation */
        .site-header {
            background-color: var(--background-color);
            padding: var(--spacing-md) 0;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        }

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

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

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

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

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

        .main-nav a {
            color: var(--text-color);
            font-weight: bold;
            font-size: 1.1rem;
            padding: var(--spacing-sm) 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

        .main-nav a:hover::after,
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: var(--border-radius);
        }
        
        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: var(--spacing-xl) 0;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

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

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

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

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

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

        .article-content {
            max-width: 800px;
            margin: 0 auto;
            background-color: var(--card-background);
            padding: var(--spacing-xl);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-medium);
        }
        
        .article-content h1 {
            font-size: 2.5rem;
            margin-bottom: var(--spacing-md);
            color: var(--primary-color);
            line-height: 1.2;
        }

        .article-meta {
            font-size: 0.9rem;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-lg);
        }

        .article-meta span {
            margin-right: var(--spacing-md);
        }

        .article-body img {
            margin: var(--spacing-lg) auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-medium);
        }

        .article-body h2, .article-body h3 {
            margin-top: var(--spacing-lg);
            margin-bottom: var(--spacing-md);
            color: var(--primary-color);
        }

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

        .article-body h3 {
            font-size: 1.6rem;
        }

        .article-body p {
            margin-bottom: var(--spacing-md);
        }

        .no-content {
            text-align: center;
            padding: var(--spacing-xl) 0;
            font-size: 1.2rem;
            color: var(--light-text-color);
        }

        .no-content a {
            font-weight: bold;
            margin-top: var(--spacing-md);
            display: inline-block;
        }

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

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: var(--spacing-lg);
            color: var(--primary-color);
            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(--secondary-color);
            border-radius: var(--border-radius);
        }

        /* Card Styling */
        .card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-medium);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        .card-image {
            position: relative;
            overflow: hidden;
            padding-top: 60%; /* Aspect ratio */
        }

        .card-image img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .card-content {
            padding: var(--spacing-md);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

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

        .card-excerpt {
            font-size: 0.95rem;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-md);
            flex-grow: 1;
        }

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

        .card-date {
            font-size: 0.85rem;
            color: var(--light-text-color);
        }

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

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

        .faq-question {
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            padding-left: 25px;
            color: var(--primary-color);
        }

        .faq-question::before,
        .faq-question::after {
            content: '';
            position: absolute;
            background-color: var(--primary-color);
            transition: transform 0.3s ease;
        }

        .faq-question::before {
            height: 2px;
            width: 15px;
            top: 8px;
            left: 0;
        }

        .faq-question::after {
            height: 15px;
            width: 2px;
            top: 1px;
            left: 7px;
        }

        .faq-item.open .faq-question::after {
            transform: rotate(90deg);
        }

        .faq-answer {
            font-size: 1rem;
            color: var(--light-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding-left: 25px; /* Align with question */
        }

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

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

        .cta-section h2 {
            font-size: 2rem;
            margin-bottom: var(--spacing-md);
        }

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

        /* Footer */
        .site-footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: var(--spacing-xl) 0;
            margin-top: auto; /* Pushes footer to the bottom */
        }

        .site-footer .container {
            text-align: center;
        }

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

        .footer-nav ul {
            list-style: none;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: var(--spacing-md);
        }

        .footer-nav li {
            margin: 0 var(--spacing-md);
        }

        .footer-nav a {
            color: var(--footer-text-color);
            font-size: 1rem;
            transition: color 0.3s ease;
        }

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

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

        /* Responsive Adjustments */
        @media (max-width: 1024px) {
            .main-nav li {
                margin-left: var(--spacing-md);
            }
            .main-nav a {
                font-size: 1rem;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .article-content {
                padding: var(--spacing-lg);
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                flex-direction: column;
            }
            .logo {
                margin-bottom: var(--spacing-md);
            }
            .main-nav ul {
                flex-direction: column;
                align-items: center;
            }
            .main-nav li {
                margin-left: 0;
                margin-bottom: var(--spacing-sm);
            }
            .main-nav a {
                font-size: 1.2rem;
            }
            .hero {
                padding: var(--spacing-lg) 0;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .card-content {
                padding: var(--spacing-md);
            }
            .card-title {
                font-size: 1.2rem;
            }
            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav li {
                margin: 0 0 var(--spacing-sm);
            }
        }
        
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .article-content {
                padding: var(--spacing-md);
            }
            .article-content h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .btn {
                padding: var(--spacing-sm) var(--spacing-md);
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #e91e63;
            --secondary-color: #ff9800;
            --background-color: #f8f9fa;
            --text-color: #333;
            --muted-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --body-font: 'Helvetica Neue', Arial, sans-serif;
            --heading-font: 'Georgia', serif;
            --border-radius: 8px;
            --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--body-font);
            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-md);
            width: 100%;
        }

        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;
        }

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

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

        .btn {
            display: inline-block;
            padding: var(--spacing-sm) var(--spacing-md);
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 1rem;
            font-weight: bold;
            text-align: center;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
        }

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

        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(233, 30, 99, 0.4);
        }

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

        .btn-secondary:hover {
            background-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 152, 0, 0.4);
        }

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

        .section-title {
            text-align: center;
            margin-bottom: var(--spacing-lg);
            font-size: 2.25rem;
            color: var(--primary-color);
        }

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

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

        .main-nav .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            font-family: var(--heading-font);
        }
        .main-nav .logo span {
            color: var(--secondary-color);
        }

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

        .main-nav ul li a {
            font-size: 1.1rem;
            font-weight: bold;
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

        /* Mobile Nav Toggle */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--primary-color);
        }

        /* Hero Section */
        .hero-section {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: var(--spacing-xl) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

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

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

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-md);
            color: #fff;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
        }

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

        .hero-cta .btn {
            margin: 0 var(--spacing-sm);
        }

        /* Category Content Section */
        .category-content {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: var(--spacing-lg);
            margin-top: var(--spacing-xl);
        }

        .category-content h2 {
            color: var(--primary-color);
            font-size: 2rem;
            margin-bottom: var(--spacing-md);
            text-align: center;
        }

        .category-content p {
            font-size: 1.1rem;
            color: var(--muted-text-color);
            text-align: justify;
            margin-bottom: var(--spacing-md);
        }

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

        .feature-item {
            background-color: var(--card-background);
            padding: var(--spacing-md);
            border-radius: var(--border-radius);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }

        .feature-item img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-sm);
        }

        .feature-item h3 {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-xs);
        }

        .feature-item p {
            font-size: 0.95rem;
            color: var(--muted-text-color);
            line-height: 1.6;
        }

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: var(--spacing-lg);
            margin-top: var(--spacing-xl);
        }

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

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

        .faq-question {
            font-size: 1.25rem;
            font-weight: bold;
            color: var(--primary-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

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

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

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

        /* CTA Section */
        .cta-section {
            text-align: center;
            background-color: var(--primary-color);
            color: #fff;
            padding: var(--spacing-xl) 0;
            margin-top: var(--spacing-xl);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }

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

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

        .cta-section .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            font-size: 1.2rem;
            padding: var(--spacing-sm) var(--spacing-lg);
        }
        .cta-section .btn:hover {
            background-color: var(--primary-color);
            color: #fff;
            box-shadow: 0 6px 20px rgba(233, 30, 99, 0.4);
        }


        /* Footer */
        .site-footer {
            background-color: #333;
            color: #ccc;
            padding: var(--spacing-lg) 0;
            margin-top: auto; /* Pushes footer to the bottom */
            text-align: center;
        }

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

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

        .footer-nav ul {
            list-style: none;
            padding: 0;
            margin-bottom: var(--spacing-md);
            display: flex;
            gap: var(--spacing-md);
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-nav ul li a {
            color: #ccc;
            font-size: 1rem;
            transition: color 0.3s ease;
        }

        .footer-nav ul li a:hover {
            color: var(--secondary-color);
        }

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

        /* Responsive Design */
        @media (max-width: 768px) {
            .main-nav ul {
                display: none; /* Hide desktop nav */
                flex-direction: column;
                position: absolute;
                top: 70px; /* Below header */
                left: 0;
                right: 0;
                background-color: var(--card-background);
                box-shadow: var(--shadow);
                padding: var(--spacing-sm) 0;
            }

            .main-nav ul.show {
                display: flex;
            }

            .main-nav ul li {
                text-align: center;
                margin: var(--spacing-xs) 0;
            }
            .main-nav ul li a {
                display: block;
                padding: var(--spacing-sm);
            }

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

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

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

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

            .footer-nav ul {
                flex-direction: column;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉色 */
            --secondary-color: #ffc107; /* 明亮的黄色 */
            --background-color: #121212; /* 深邃的黑色背景 */
            --text-color: #ffffff; /* 白色主文字 */
            --sub-text-color: #bbbbbb; /* 浅灰色次文字 */
            --border-color: #333333; /* 深灰色边框 */
            --card-background: #1e1e1e; /* 卡片深灰色背景 */
            --button-hover-bg: #f50057; /* 粉色深一色 */
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --rounded-sm: 4px;
            --rounded-md: 8px;
            --rounded-lg: 16px;
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
            --font-family: 'Arial', 'Helvetica Neue', 'Helvetica', sans-serif;
        }

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

        body {
            font-family: var(--font-family);
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

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

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

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

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

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

        .site-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--primary-color);
        }
        .site-logo span {
            color: var(--secondary-color);
        }

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

        .main-nav ul li a {
            color: var(--text-color);
            font-weight: bold;
            padding: var(--spacing-xs) var(--spacing-sm);
            border-radius: var(--rounded-sm);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

        .hero-section {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: var(--text-color);
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-sm);
            min-height: 60vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 1;
        }

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

        .hero-title {
            font-size: 3em;
            font-weight: bold;
            margin-bottom: var(--spacing-sm);
            text-shadow: var(--shadow-md);
        }

        .hero-subtitle {
            font-size: 1.5em;
            color: var(--sub-text-color);
            margin-bottom: var(--spacing-lg);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--background-color);
            padding: var(--spacing-md) var(--spacing-xl);
            font-size: 1.2em;
            font-weight: bold;
            border-radius: var(--rounded-lg);
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: var(--shadow-md);
        }

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

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

        .section-title {
            text-align: center;
            font-size: 2.5em;
            font-weight: bold;
            margin-bottom: var(--spacing-lg);
            color: var(--primary-color);
        }

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

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

        .content-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
        }

        .content-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }

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

        .card-title {
            font-size: 1.3em;
            font-weight: bold;
            margin-bottom: var(--spacing-sm);
            color: var(--secondary-color);
        }

        .card-description {
            font-size: 0.95em;
            color: var(--sub-text-color);
            margin-bottom: var(--spacing-md);
        }

        .card-link {
            display: inline-block;
            font-weight: bold;
            color: var(--primary-color);
        }
        .card-link:hover {
            color: var(--button-hover-bg);
        }

        .faq-section {
            background-color: var(--card-background);
            border-radius: var(--rounded-md);
            padding: var(--spacing-lg);
        }

        .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: 1.1em;
            font-weight: bold;
            margin-bottom: var(--spacing-sm);
            cursor: pointer;
            position: relative;
            padding-left: 25px;
        }

        .faq-question::before {
            content: '+';
            position: absolute;
            left: 0;
            top: 0;
            font-size: 1.3em;
            color: var(--secondary-color);
        }

        .faq-answer {
            font-size: 0.95em;
            color: var(--sub-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .faq-item.active .faq-answer {
            max-height: 150px; /* Adjust as needed */
        }
        .faq-item.active .faq-question::before {
            content: '-';
        }

        .cta-section {
            background-color: var(--primary-color);
            color: var(--background-color);
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-sm);
            border-radius: var(--rounded-md);
        }

        .cta-section .section-title {
            color: var(--background-color);
        }

        .cta-section .hero-subtitle {
            color: var(--card-background);
            font-size: 1.3em;
        }

        .cta-button-secondary {
            display: inline-block;
            background-color: var(--background-color);
            color: var(--primary-color);
            padding: var(--spacing-md) var(--spacing-xl);
            font-size: 1.2em;
            font-weight: bold;
            border-radius: var(--rounded-lg);
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: var(--shadow-md);
        }

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


        .site-footer {
            background-color: var(--card-background);
            padding: var(--spacing-lg) 0 var(--spacing-md);
            margin-top: auto; /* Push footer to the bottom */
            text-align: center;
            box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
        }

        .site-footer .container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: var(--spacing-md);
        }

        .footer-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--primary-color);
        }
        .footer-logo span {
            color: var(--secondary-color);
        }

        .footer-nav ul {
            list-style: none;
            display: flex;
            gap: var(--spacing-md);
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-nav ul li a {
            color: var(--sub-text-color);
            transition: color 0.3s ease;
        }
        .footer-nav ul li a:hover {
            color: var(--text-color);
        }

        .footer-copyright {
            font-size: 0.9em;
            color: var(--sub-text-color);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .main-nav ul {
                display: none; /* Hide desktop nav on mobile, handled by JS/menu button */
            }

            .hero-title {
                font-size: 2.5em;
            }

            .hero-subtitle {
                font-size: 1.2em;
            }

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

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

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

/* roulang page: category3 */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #f0a500;
            --accent-color: #2ecc71;
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg-color: #ffffff;
            --container-max-width: 1200px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --border-radius-sm: 4px;
            --border-radius-md: 8px;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        html, body {
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            box-sizing: border-box;
        }

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

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

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

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

        .main-nav ul li a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--border-radius-sm);
            transition: color 0.3s ease, background-color 0.3s ease;
        }

        .main-nav ul li a:hover,
        .main-nav ul li a:focus {
            color: #ffffff;
            background-color: var(--primary-color);
        }

        .main-nav ul li a.active {
            color: #ffffff;
            background-color: var(--primary-color);
            font-weight: 700;
        }

        .site-logo {
            font-size: 1.8em;
            font-weight: 700;
            color: var(--primary-color);
            margin-right: var(--spacing-lg);
            display: flex;
            align-items: center;
        }

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

        /* Hero Section */
        .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;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 50vh;
        }

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

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            padding: var(--spacing-lg);
            background: rgba(0, 0, 0, 0.4);
            border-radius: var(--border-radius-md);
        }

        .hero h1 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-md);
            line-height: 1.2;
            text-shadow: 0 2px 8px rgba(0,0,0,0.5);
        }

        .hero p {
            font-size: 1.2em;
            color: #e0e0e0;
            margin-bottom: var(--spacing-xl);
        }

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

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

        .section-description {
            text-align: center;
            color: var(--light-text-color);
            font-size: 1.1em;
            max-width: 700px;
            margin: 0 auto var(--spacing-xl) auto;
        }

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

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

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }

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

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

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

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

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

        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: #ffffff;
            padding: var(--spacing-sm) var(--spacing-md);
            border: none;
            border-radius: var(--border-radius-sm);
            text-decoration: none;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.2s ease;
            font-size: 1em;
        }

        .btn:hover,
        .btn:focus {
            background-color: #27ae60;
            transform: translateY(-2px);
            outline: none;
        }

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

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

        .faq-question {
            font-size: 1.2em;
            font-weight: 600;
            cursor: pointer;
            position: relative;
            padding-left: var(--spacing-lg);
            color: var(--text-color);
        }

        .faq-question::before {
            content: '+';
            position: absolute;
            left: 0;
            font-weight: bold;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }

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

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

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
        }

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

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

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

        .cta-section .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            padding: var(--spacing-md) var(--spacing-xl);
            font-size: 1.1em;
            font-weight: 700;
        }

        .cta-section .btn:hover,
        .cta-section .btn:focus {
            background-color: #e69500;
        }

        /* Footer Styles */
        .site-footer {
            background-color: #343a40;
            color: #ffffff;
            padding: var(--spacing-xl) 0;
            text-align: center;
            font-size: 0.9em;
        }

        .site-footer .container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: var(--spacing-md);
        }

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

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

        .footer-nav ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: var(--spacing-md);
        }

        .footer-nav ul li a {
            color: #e0e0e0;
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        .footer-copyright {
            color: var(--light-text-color);
            margin-top: var(--spacing-md);
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .main-nav ul {
                flex-wrap: wrap;
                justify-content: center;
            }
            .hero h1 {
                font-size: 2.4em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .section h2 {
                font-size: 1.8em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .main-nav ul {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
            .main-nav li {
                margin-bottom: var(--spacing-sm);
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 1em;
            }
            .section {
                padding: var(--spacing-lg) 0;
            }
            .section h2 {
                font-size: 1.6em;
            }
            .cta-section h2 {
                font-size: 1.8em;
            }
            .footer-nav ul {
                flex-direction: column;
            }
        }

        @media (max-width: 576px) {
            .container {
                padding: 0 var(--spacing-sm);
            }
            .hero {
                min-height: 40vh;
            }
            .hero-content {
                padding: var(--spacing-md);
            }
            .hero h1 {
                font-size: 1.8em;
            }
            .card-content {
                padding: var(--spacing-md);
            }
            .btn {
                padding: var(--spacing-sm) var(--spacing-md);
                font-size: 0.9em;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e94e77;
            --secondary-color: #3a3a3a;
            --accent-color: #f4a261;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #e0e0e0;
            --card-background: #fff;
            --footer-background: #2c3e50;
            --footer-text-color: #ecf0f1;
            --header-background: rgba(255, 255, 255, 0.95);
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --border-radius-sm: 4px;
            --border-radius-md: 8px;
            --border-radius-lg: 16px;
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
            --transition-fast: 0.2s ease-in-out;
        }

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

        body {
            font-family: 'Helvetica Neue', 'Arial', 'PingFang SC', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            scroll-behavior: smooth;
        }

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

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

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

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

        /* Header & Navigation */
        .site-header {
            background-color: var(--header-background);
            backdrop-filter: blur(10px);
            padding: var(--spacing-sm) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-md);
        }

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

        .main-nav .logo {
            font-size: 1.8em;
            font-weight: bold;
            color: var(--secondary-color);
            text-decoration: none;
        }

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

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

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

        .main-nav ul li a {
            font-size: 1.1em;
            font-weight: 500;
            color: var(--secondary-color);
            text-decoration: none;
            padding: var(--spacing-sm) 0;
            position: relative;
            transition: color var(--transition-fast);
        }
        
        .main-nav ul li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width var(--transition-fast);
        }

        .main-nav ul li a:hover,
        .main-nav ul li a.active {
            color: var(--primary-color);
        }
        
        .main-nav ul li a.active::after,
        .main-nav ul li a:hover::after {
            width: 100%;
        }

        /* Mobile Navigation - basic structure, actual toggling JS needed */
        .mobile-nav-toggle {
            display: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--secondary-color);
        }

        .mobile-nav-menu {
            display: none; /* Hidden by default */
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background-color: var(--header-background);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-md);
            flex-direction: column;
            align-items: center;
        }

        .mobile-nav-menu ul {
            flex-direction: column;
            width: 100%;
        }

        .mobile-nav-menu ul li {
            margin: var(--spacing-sm) 0;
            text-align: center;
        }

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

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7));
            z-index: 1;
        }

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

        .hero-section h1 {
            font-size: 3.5em;
            margin-bottom: var(--spacing-md);
            line-height: 1.2;
        }

        .hero-section p {
            font-size: 1.4em;
            margin-bottom: var(--spacing-lg);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: var(--spacing-sm) var(--spacing-lg);
            font-size: 1.2em;
            font-weight: bold;
            border-radius: var(--border-radius-md);
            text-decoration: none;
            transition: background-color var(--transition-fast), transform var(--transition-fast);
            box-shadow: var(--shadow-md);
        }

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

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

        .section-title {
            text-align: center;
            font-size: 2.8em;
            margin-bottom: var(--spacing-lg);
            color: var(--secondary-color);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.3em;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-xl);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Card Grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: var(--spacing-lg);
        }

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

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg); /* Redundant if same as base, ensure hover is distinct */
        }

        .content-card img {
            width: 100%;
            height: 220px; /* Fixed height for cover images */
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }

        .card-content {
            padding: var(--spacing-lg);
            flex-grow: 1; /* Allows card content to fill available space */
            display: flex;
            flex-direction: column;
            justify-content: space-between; /* Pushes button to bottom */
        }

        .card-title {
            font-size: 1.5em;
            color: var(--secondary-color);
            margin-bottom: var(--spacing-sm);
        }

        .card-description {
            font-size: 1em;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-md);
            flex-grow: 1; /* Pushes description to bottom if needed */
        }

        .card-link {
            display: inline-block;
            margin-top: auto; /* Pushes link to the bottom of the card content */
            text-align: right;
            font-weight: bold;
        }

        /* Feature Section */
        .feature-section {
            background-color: #fff;
            padding: var(--spacing-xl) 0;
            margin-top: var(--spacing-xl); /* Separates from previous section */
        }

        .feature-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-xl);
            text-align: center;
        }

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

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

        .feature-item h3 {
            font-size: 1.3em;
            color: var(--secondary-color);
            margin-bottom: var(--spacing-xs);
        }

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

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

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

        .faq-question {
            background-color: #fff;
            padding: var(--spacing-md);
            font-size: 1.2em;
            font-weight: bold;
            color: var(--secondary-color);
            cursor: pointer;
            position: relative;
            transition: background-color var(--transition-fast);
        }

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

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

        .faq-answer {
            background-color: var(--card-background);
            padding: var(--spacing-md);
            font-size: 1em;
            color: var(--light-text-color);
            display: none; /* Hidden by default */
        }
        
        .faq-answer p {
            margin-bottom: var(--spacing-sm);
        }

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

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

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

        .cta-button.cta-secondary {
            background-color: var(--accent-color);
        }
        .cta-button.cta-secondary:hover {
            background-color: var(--primary-color);
        }

        /* Footer */
        .site-footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            font-size: 0.95em;
            text-align: center;
        }

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

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

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

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

        .footer-nav ul li {
            margin: 0 var(--spacing-md);
        }

        .footer-nav ul li a {
            color: var(--footer-text-color);
            transition: color var(--transition-fast);
        }

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

        .footer-copyright {
            margin-top: var(--spacing-sm);
            opacity: 0.8;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav ul {
                display: none; /* Hide desktop nav on smaller screens */
            }

            .mobile-nav-toggle {
                display: block; /* Show mobile toggle */
            }

            .hero-section h1 {
                font-size: 3em;
            }

            .hero-section p {
                font-size: 1.2em;
            }

            .feature-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 var(--spacing-sm);
            }

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

            .hero-section h1 {
                font-size: 2.5em;
            }

            .hero-section p {
                font-size: 1.1em;
            }

            .section-title {
                font-size: 2.2em;
            }
            
            .card-grid {
                grid-template-columns: 1fr;
            }

            .feature-list {
                grid-template-columns: 1fr;
            }

            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav ul li {
                margin: var(--spacing-xs) 0;
            }
        }
        
        @media (max-width: 520px) {
            .main-nav .logo {
                font-size: 1.5em;
            }
            .mobile-nav-toggle {
                font-size: 1.5em;
            }
            
            .hero-section {
                padding: var(--spacing-lg) 0 var(--spacing-md);
            }
            .hero-section h1 {
                font-size: 2em;
            }
            .hero-section p {
                font-size: 1em;
            }
            .cta-button {
                padding: var(--spacing-sm) var(--spacing-md);
                font-size: 1em;
            }
            .section-title {
                font-size: 1.8em;
            }
            .section-subtitle {
                font-size: 1.1em;
            }
            .feature-item h3 {
                font-size: 1.1em;
            }
            .faq-question {
                font-size: 1.1em;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
        }