/* roulang page: index */
:root {
            --primary-color: #f2644f; /* 暖色调，充满活力 */
            --secondary-color: #333; /* 深邃，代表深度 */
            --accent-color: #ffcc00; /* 强调色，点亮瞬间 */
            --background-color: #f8f8f8; /* 浅灰背景，干净舒适 */
            --text-color: #333;
            --subtle-text-color: #777;
            --border-color: #ddd;
            --card-background: #ffffff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
            --spacing-unit: 8px;
            --container-max-width: 1200px;
            --font-family: 'Arial', 'Microsoft YaHei', 'SimSun', sans-serif;
        }

        *, *::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);
            overflow-x: hidden;
        }

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

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

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

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

        /* Header & Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: var(--shadow-sm);
            padding: calc(var(--spacing-unit) * 2) 0;
        }

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

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

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

        .nav-links {
            list-style: none;
            display: flex;
            gap: calc(var(--spacing-unit) * 4);
        }

        .nav-links li a {
            font-size: 1.1em;
            color: var(--secondary-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
            border-radius: var(--radius-sm);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

        /* Mobile Nav */
        .mobile-nav-toggle {
            display: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--secondary-color);
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.9);
            z-index: 1000;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: calc(var(--spacing-unit) * 3);
        }

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

        .mobile-nav li a {
            font-size: 1.5em;
            color: var(--card-background);
            font-weight: bold;
        }

        .mobile-nav .close-nav {
            position: absolute;
            top: calc(var(--spacing-unit) * 3);
            right: calc(var(--spacing-unit) * 3);
            font-size: 2.5em;
            color: var(--card-background);
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            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: var(--card-background);
            text-align: center;
            padding: calc(var(--spacing-unit) * 10) 0;
            min-height: 60vh;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }

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

        .hero p {
            font-size: 1.4em;
            margin-bottom: calc(var(--spacing-unit) * 4);
            max-width: 700px;
        }

        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--secondary-color);
            padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
            border-radius: var(--radius-lg);
            font-size: 1.3em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: var(--shadow-md);
        }

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

        /* Section Styling */
        section {
            padding: calc(var(--spacing-unit) * 8) 0;
        }

        section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 5);
            color: var(--secondary-color);
        }

        section p {
            text-align: center;
            max-width: 800px;
            margin: 0 auto calc(var(--spacing-unit) * 5);
            color: var(--subtle-text-color);
        }

        /* Core Offerings Section */
        .core-offerings {
            background-color: var(--card-background);
        }

        .offerings-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 5);
        }

        .offering-card {
            background-color: var(--card-background);
            border-radius: var(--radius-lg);
            padding: calc(var(--spacing-unit) * 4);
            text-align: center;
            box-shadow: var(--shadow-md);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

        .offering-card img {
            width: 80px;
            height: 80px;
            margin: 0 auto calc(var(--spacing-unit) * 3);
            border-radius: var(--radius-md);
            background-color: var(--primary-color);
            padding: calc(var(--spacing-unit) * 2);
        }

        .offering-card h3 {
            font-size: 1.5em;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--secondary-color);
        }

        .offering-card p {
            text-align: left;
            color: var(--subtle-text-color);
            font-size: 0.95em;
            max-width: none;
        }

        /* Process Section */
        .process-section {
            background-color: var(--background-color);
        }

        .process-steps {
            position: relative;
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .process-steps::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--primary-color);
            transform: translateX(-50%);
            z-index: 0;
        }

        .step {
            width: 50%;
            padding: calc(var(--spacing-unit) * 3);
            position: relative;
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit) * 3);
        }

        .step:nth-child(even) {
            left: 50%;
        }

        .step:nth-child(odd) {
            right: 50%;
        }

        .step-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--accent-color);
            color: var(--secondary-color);
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8em;
            font-weight: bold;
            flex-shrink: 0;
            z-index: 1;
        }

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

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

        .step-content p {
            text-align: left;
            font-size: 0.9em;
            color: var(--subtle-text-color);
            margin-bottom: 0;
        }

        /* Latest Information Section */
        .latest-info {
            background-color: var(--card-background);
        }

        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: calc(var(--spacing-unit) * 5);
        }

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

        .info-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.1);
        }

        .info-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }

        .info-content {
            padding: calc(var(--spacing-unit) * 3);
            flex-grow: 1;
        }

        .info-content h3 {
            font-size: 1.2em;
            margin-bottom: var(--spacing-unit);
            color: var(--secondary-color);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            min-height: 2.4em; /* To ensure consistent height */
        }

        .info-content .meta {
            font-size: 0.8em;
            color: var(--subtle-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .info-content p {
            font-size: 0.9em;
            color: var(--subtle-text-color);
            text-align: left;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            margin-bottom: 0;
        }

        .info-card a {
            display: block;
            width: 100%;
            text-align: center;
            padding: calc(var(--spacing-unit) * 2);
            background-color: var(--primary-color);
            color: var(--card-background);
            font-weight: bold;
            text-decoration: none;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            transition: background-color 0.3s ease;
        }

        .info-card a:hover {
            background-color: var(--secondary-color);
        }

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

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

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

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

        .faq-question {
            padding: calc(var(--spacing-unit) * 3);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: bold;
            color: var(--secondary-color);
            font-size: 1.1em;
        }

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

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

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

        .faq-answer {
            padding: 0 calc(var(--spacing-unit) * 3);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: var(--subtle-text-color);
            font-size: 0.95em;
        }

        .faq-item.active .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: calc(var(--spacing-unit) * 3);
        }

        /* CTA Section */
        .cta-section {
            background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: var(--card-background);
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
        }

        .cta-section h2 {
            color: var(--card-background);
            font-size: 2.8em;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .cta-section p {
            font-size: 1.2em;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: calc(var(--spacing-unit) * 5);
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 6) 0;
            text-align: center;
            font-size: 0.9em;
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: calc(var(--spacing-unit) * 3);
        }

        .footer-logo {
            font-size: 1.5em;
            font-weight: bold;
            color: var(--accent-color);
        }

        .footer-nav, .footer-social {
            list-style: none;
            display: flex;
            gap: calc(var(--spacing-unit) * 4);
        }

        .footer-nav a, .footer-social a {
            color: var(--footer-text-color);
            transition: color 0.3s ease;
        }

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

        .copyright {
            margin-top: calc(var(--spacing-unit) * 4);
            opacity: 0.8;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .main-nav .nav-links {
                display: none;
            }
            .mobile-nav-toggle {
                display: block;
            }

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

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

            section h2 {
                font-size: 2em;
                margin-bottom: calc(var(--spacing-unit) * 4);
            }

            .step {
                width: 100%;
                left: 0 !important;
                right: 0 !important;
                padding: calc(var(--spacing-unit) * 2);
            }

            .step::before {
                left: 25px; /* Icon position offset */
                transform: none;
            }

            .step:nth-child(even) {
                left: 0;
            }

            .step-icon {
                position: absolute;
                left: 0;
            }

            .process-steps {
                padding-left: calc(var(--spacing-unit) * 6);
            }

            .footer-nav, .footer-social {
                flex-direction: column;
                gap: calc(var(--spacing-unit) * 2);
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 2em;
            }

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

            .cta-button {
                font-size: 1.1em;
                padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
            }

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

            section h2 {
                font-size: 1.8em;
            }

            .offering-card {
                padding: calc(var(--spacing-unit) * 3);
            }

            .info-card img {
                height: 150px;
            }

            .faq-question {
                font-size: 1em;
            }

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

            .cta-section p {
                font-size: 1em;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #4CAF50;
            --secondary-color: #8BC34A;
            --accent-color: #FFC107;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 0.5rem;
            --shadow: 0 4px 8px rgba(0,0,0,0.1);
            --transition-speed: 0.3s;
        }

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

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

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

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

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

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

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

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

        .main-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-unit) 0;
        }

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

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

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

        .nav-links a {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--light-text-color);
            padding: 0.5rem 0;
            position: relative;
            transition: color var(--transition-speed) ease;
        }

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

        .nav-links a:hover {
            color: var(--primary-color);
            text-decoration: none;
        }
        .nav-links a:hover::after {
             content: '';
             position: absolute;
             left: 0;
             bottom: 0;
             width: 100%;
             height: 2px;
             background-color: var(--primary-color);
        }

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

        /* Hero Section */
        .hero {
            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: #ffffff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) var(--spacing-unit);
        }

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

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

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

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

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

        .article-content h2 {
            font-size: 2rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
            line-height: 1.3;
        }

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

        .article-content strong {
            color: var(--primary-color);
        }

        .article-content ul {
            list-style: disc;
            margin-left: calc(var(--spacing-unit) * 2);
            margin-bottom: var(--spacing-unit);
        }

        .article-content li {
            margin-bottom: calc(var(--spacing-unit) / 2);
        }
        
        .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
        }
        .no-content h2 {
            font-size: 2.5rem;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-unit);
        }
        .no-content p {
            font-size: 1.2rem;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
        }
        .no-content a {
            font-size: 1.2rem;
            font-weight: 600;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            background-color: var(--primary-color);
            color: white;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-speed) ease;
        }
        .no-content a:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
        }


        /* Footer */
        footer {
            background-color: #333;
            color: #ffffff;
            padding: calc(var(--spacing-unit) * 3) 0;
            margin-top: calc(var(--spacing-unit) * 4);
        }

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

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

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

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

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

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

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

        /* Responsive Design */
        @media (max-width: 768px) {
            .main-nav {
                flex-wrap: wrap;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                position: absolute;
                top: 70px; /* Adjust based on header height */
                left: 0;
                background-color: #ffffff;
                box-shadow: var(--shadow);
                padding: var(--spacing-unit) 0;
            }
            .nav-links li {
                margin: var(--spacing-unit) 0;
                text-align: center;
            }
            .nav-links a {
                display: block;
                width: 100%;
                padding: var(--spacing-unit);
            }
            .mobile-nav-toggle {
                display: block;
                order: 1; /* Ensure toggle is visible */
            }
            .main-nav .logo {
                order: 0;
            }

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

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

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

            .footer-nav {
                flex-direction: column;
            }
            .footer-nav li {
                margin: calc(var(--spacing-unit) / 2) 0;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 1.5rem;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --spacing-unit: 1rem;
            --container-max-width: 1140px;
        }

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

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

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

        /* Navigation */
        header {
            background-color: #fff;
            box-shadow: 0 2px 8px rgba(0,0,0,.05);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .main-nav {
            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(--text-color);
        }

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

        .nav-links a {
            text-decoration: none;
            color: var(--light-text-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) / 2) 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .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 {
            color: var(--primary-color);
        }

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

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

        /* Hero Section */
        .hero {
            background-image: linear-gradient(rgba(0,0,0,.5), rgba(0,0,0,.5)), url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            padding: calc(var(--spacing-unit) * 6) 0;
            text-align: center;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5); /* Dark overlay */
        }

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

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

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: bold;
            font-size: 1.1rem;
            transition: background-color 0.3s ease, transform 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .cta-button:hover {
            background-color: #0056b3;
            transform: translateY(-2px);
        }

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

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

        .section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: var(--light-text-color);
            max-width: 700px;
            margin: 0 auto var(--spacing-unit) auto;
        }

        /* Content Cards */
        .cards-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

        .card {
            background-color: #fff;
            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(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,.15);
        }

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

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

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

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

        .card-link {
            display: block;
            text-align: right;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: bold;
            margin-top: auto; /* Pushes link to the bottom */
            transition: color 0.3s ease;
        }
        .card-link:hover {
            color: #0056b3;
        }

        /* Feature Section */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: calc(var(--spacing-unit) * 2);
            align-items: start;
        }

        .feature-item {
            text-align: center;
        }

        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

        .feature-title {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) / 2);
            color: var(--text-color);
        }

        .feature-description {
            font-size: 0.95rem;
            color: var(--light-text-color);
        }

        /* FAQ Section */
        .faq-list {
            list-style: none;
            display: grid;
            gap: var(--spacing-unit);
        }

        .faq-item {
            background-color: #fff;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: var(--spacing-unit);
        }

        .faq-question {
            font-weight: bold;
            color: var(--primary-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: calc(var(--spacing-unit) / 2) 0;
        }

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

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

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

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: var(--spacing-unit) 0;
        }

        /* Footer */
        footer {
            background-color: #343a40;
            color: #f8f9fa;
            padding: calc(var(--spacing-unit) * 3) 0;
            margin-top: calc(var(--spacing-unit) * 4);
        }

        .footer-content {
            text-align: center;
        }

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

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

        .footer-nav a {
            color: #f8f9fa;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-nav a:hover {
            color: var(--primary-color);
        }

        .copyright {
            font-size: 0.9rem;
            color: #adb5bd;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 60px; /* Adjust based on header height */
                left: 0;
                right: 0;
                background-color: #fff;
                padding: var(--spacing-unit) 0;
                box-shadow: 0 2px 8px rgba(0,0,0,.05);
            }

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

            .nav-links li {
                text-align: center;
                margin-bottom: var(--spacing-unit);
            }

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

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

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

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

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

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

/* roulang page: category2 */
:root {
            --primary-color: #4CAF50;
            --secondary-color: #45a049;
            --accent-color: #f44336;
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --hover-shadow: 0 8px 16px rgba(0,0,0,0.2);
            --default-shadow: 0 4px 8px rgba(0,0,0,0.1);
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --header-height: 80px;
            --footer-height: 100px;
            --border-radius: 8px;
            --transition-speed: 0.3s;
        }

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

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

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

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

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

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

        button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 1rem;
            transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
        }

        button:hover, button:focus {
            background-color: var(--secondary-color);
            box-shadow: var(--default-shadow);
            outline: none;
        }

        /* Header & Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: var(--default-shadow);
            height: var(--header-height);
            position: sticky;
            top: 0;
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .main-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

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

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

        .nav-links {
            list-style: none;
            display: flex;
            gap: var(--spacing-unit) * 2;
        }

        .nav-links li a {
            color: var(--text-color);
            font-weight: 500;
            padding: 10px 0;
            position: relative;
            transition: color var(--transition-speed) ease;
        }

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

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

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

        /* Hero Section */
        .hero {
            background-color: #e0f2e9; /* Light green background for category page */
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 80, 0, 0.5); /* Darker green overlay */
            z-index: 1;
        }

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

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

        .hero p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            color: #e0e0e0;
        }

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

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--text-color);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) * 1.5);
        }

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

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

        .content-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            padding: calc(var(--spacing-unit) * 2);
            box-shadow: var(--default-shadow);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            display: flex;
            flex-direction: column;
        }

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

        .content-card img {
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-unit);
            object-fit: cover;
            height: 200px; /* Fixed height for consistency */
        }

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

        .content-card p {
            font-size: 1rem;
            color: var(--light-text-color);
            flex-grow: 1; /* Allow paragraph to take available space */
            margin-bottom: var(--spacing-unit) * 2;
        }

        .content-card .read-more {
            display: inline-block;
            margin-top: auto; /* Push to bottom */
            font-weight: bold;
            color: var(--accent-color);
        }

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

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: var(--spacing-unit) * 2 0;
        }

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

        .faq-question {
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            padding-right: 30px;
            color: var(--text-color);
        }

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

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

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

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

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

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 80, 0, 0.7); /* Dark green overlay */
            z-index: 1;
        }

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

        .cta-section h2 {
            font-size: 2.5rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

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

        .cta-button {
            background-color: var(--accent-color);
            color: white;
            padding: 15px 30px;
            font-size: 1.1rem;
            font-weight: bold;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
        }

        .cta-button:hover {
            background-color: #d32f2f;
            transform: translateY(-3px);
        }

        /* Footer */
        footer {
            background-color: #2c3e50; /* Dark blue-grey */
            color: white;
            padding: calc(var(--spacing-unit) * 4) 0;
            margin-top: auto; /* Push footer to bottom if content is short */
        }

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

        .footer-logo {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: var(--spacing-unit) * 2;
        }

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

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

        .footer-nav li a {
            color: #bdc3c7; /* Light grey text */
            transition: color var(--transition-speed) ease;
        }

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

        .copyright {
            font-size: 0.9rem;
            color: #95a5a6; /* Muted grey */
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background-color: var(--card-background);
                padding: var(--spacing-unit) * 2;
                box-shadow: var(--default-shadow);
            }

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

            .nav-links li {
                margin-bottom: var(--spacing-unit);
                text-align: center;
            }

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

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

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

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

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

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

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

        @media (max-width: 520px) {
            .logo {
                font-size: 1.5rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

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

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

/* roulang page: category3 */
:root {
            --primary-color: #ff6f61; /* 热情洋溢的珊瑚红 */
            --secondary-color: #4a90e2; /* 沉稳的知性蓝 */
            --accent-color: #f7cac0; /* 温柔的蜜桃粉 */
            --background-light: #f8f8f8;
            --background-dark: #333;
            --text-primary: #333;
            --text-secondary: #666;
            --text-light: #fff;
            --border-color: #ddd;
            --card-background: #fff;
            --footer-background: #333;
            --button-hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            --section-padding: 60px 0;
            --container-max-width: 1200px;
            --container-padding: 15px;
            --border-radius: 8px;
            --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--background-light);
            margin: 0;
            padding: 0;
            scroll-behavior: smooth;
        }

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

        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 {
            margin-top: 0;
            margin-bottom: 0.8em;
            line-height: 1.3;
            font-weight: 600;
        }

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

        .btn {
            display: inline-block;
            padding: 12px 28px;
            background-color: var(--primary-color);
            color: var(--text-light);
            border: none;
            border-radius: var(--border-radius);
            font-size: 1em;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            text-align: center;
        }

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

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

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

        /* Header */
        header {
            background-color: var(--card-background);
            padding: 15px 0;
            box-shadow: var(--box-shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

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

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            font-size: 1.1em;
            font-weight: 500;
            color: var(--text-primary);
            padding: 8px 0;
            transition: color 0.3s ease;
        }

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: var(--text-light);
            text-align: center;
            padding: 120px 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

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

        .hero h1 {
            font-size: 3.5em;
            margin-bottom: 0.3em;
            color: var(--text-light);
        }

        .hero p {
            font-size: 1.4em;
            margin-bottom: 2em;
            opacity: 0.9;
        }

        /* Section */
        section {
            padding: var(--section-padding);
        }

        .section-title {
            text-align: center;
            margin-bottom: 40px;
            font-size: 2.2em;
            color: var(--text-primary);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.3em;
            color: var(--text-secondary);
            margin-bottom: 50px;
        }

        /* Content Cards */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

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

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

        .card-image {
            width: 100%;
            height: 220px; /* Fixed height for consistency */
            overflow: hidden;
            position: relative;
        }

        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .card:hover .card-image img {
            transform: scale(1.05);
        }

        .card-content {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .card-title {
            font-size: 1.4em;
            margin-bottom: 15px;
            color: var(--text-primary);
        }

        .card-description {
            font-size: 0.95em;
            color: var(--text-secondary);
            flex-grow: 1;
            margin-bottom: 20px;
        }

        .card-link {
            font-weight: 500;
            color: var(--primary-color);
            transition: color 0.3s ease;
        }

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

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

        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }

        .process-step {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .step-icon {
            width: 60px;
            height: 60px;
            background-color: var(--accent-color);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 15px;
            color: var(--primary-color);
            font-size: 1.8em;
            font-weight: 700;
        }

        .process-step h4 {
            font-size: 1.2em;
            margin-bottom: 10px;
        }

        .process-step p {
            font-size: 0.9em;
            color: var(--text-secondary);
        }

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

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

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            margin-bottom: 20px;
            box-shadow: var(--box-shadow);
            cursor: pointer;
            padding: 20px;
            transition: box-shadow 0.3s ease;
        }

        .faq-item:hover {
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
        }

        .faq-question {
            font-size: 1.2em;
            font-weight: 500;
            color: var(--text-primary);
            position: relative;
            padding-right: 30px;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.5em;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-question::after {
            transform: translateY(-50%) rotate(45deg);
        }

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

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding-top: 15px;
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: var(--text-light);
            text-align: center;
            padding: 80px 0;
        }

        .cta-section h2 {
            font-size: 2.5em;
            margin-bottom: 0.5em;
            color: var(--text-light);
        }

        .cta-section p {
            font-size: 1.2em;
            margin-bottom: 2em;
            opacity: 0.9;
        }

        /* Footer */
        footer {
            background-color: var(--footer-background);
            color: var(--text-light);
            padding: 40px 0 20px 0;
            font-size: 0.9em;
        }

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

        .footer-logo {
            font-size: 1.6em;
            font-weight: 700;
            margin-bottom: 15px;
        }

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

        .footer-nav {
            list-style: none;
            padding: 0;
            margin: 0 0 20px 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-nav li {
            margin: 0 15px;
        }

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

        .footer-nav a:hover {
            opacity: 1;
            color: var(--accent-color);
        }

        .copyright {
            margin-top: 20px;
            opacity: 0.7;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                display: none; /* Hide desktop nav on smaller screens */
                flex-direction: column;
                position: absolute;
                top: 80px; /* Adjust based on header height */
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: var(--box-shadow);
                padding: 20px;
            }

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

            .nav-links li {
                margin: 10px 0;
                text-align: center;
            }

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

            .hero h1 {
                font-size: 2.8em;
            }

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

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

        @media (max-width: 768px) {
            h1 { font-size: 2.2em; }
            h2 { font-size: 1.8em; }

            .hero {
                padding: 80px 0;
            }
             .hero h1 {
                font-size: 2.5em;
            }

            .section-title {
                font-size: 1.8em;
            }

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

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

        @media (max-width: 576px) {
            .logo {
                font-size: 1.5em;
            }

            .nav-links a {
                font-size: 1em;
            }

            .hero h1 {
                font-size: 2.2em;
            }
            .hero p {
                font-size: 1.1em;
                margin-bottom: 1.5em;
            }

            .btn {
                padding: 10px 20px;
                font-size: 0.9em;
            }

            .footer-nav {
                flex-direction: column;
            }
            .footer-nav li {
                margin: 5px 0;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #f06595;
            --accent-color: #ffa8a8;
            --background-color: #ffffff;
            --text-color: #333333;
            --light-text-color: #666666;
            --border-color: #e0e0e0;
            --card-background: #f9f9f9;
            --button-hover-bg: #e05252;
            --button-active-bg: #c84040;
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 40px;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 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 var(--transition-speed);
        }

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

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

        h1, h2, h3, h4, h5, h6 {
            line-height: 1.2;
            margin-bottom: var(--spacing-sm);
        }

        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; }

        /* Header and Navigation */
        header {
            background-color: var(--background-color);
            padding: var(--spacing-md) 0;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            width: 100%;
        }

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

        .logo {
            font-size: 1.75rem;
            font-weight: bold;
            color: var(--primary-color);
        }
        .logo span {
            color: var(--secondary-color);
        }

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

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

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

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

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

        .mobile-nav-toggle {
            display: none;
            font-size: 1.75rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            color: white;
            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;
            right: 0;
            bottom: 0;
            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);
            color: white;
        }

        .hero p {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }

        .hero .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color var(--transition-speed), transform var(--transition-speed);
            box-shadow: var(--box-shadow);
        }

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

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

        .section h2 {
            text-align: center;
            margin-bottom: var(--spacing-lg);
            font-size: 2.25rem;
            color: var(--primary-color);
        }

        .section-subtitle {
            text-align: center;
            color: var(--light-text-color);
            font-size: 1.1rem;
            margin-bottom: var(--spacing-xl);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

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

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

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

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

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

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

        .card-link {
            display: inline-block;
            font-weight: bold;
            color: var(--secondary-color);
            margin-top: auto; /* Pushes link to the bottom if content varies */
        }

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

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

        /* Feature Section */
        .feature-section {
            background-color: var(--card-background);
        }
        .feature-section .section-title {
            color: var(--text-color);
        }

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

        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-top: var(--spacing-sm);
            flex-shrink: 0;
        }

        .feature-text h4 {
            font-size: 1.2rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-xs);
        }

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

        /* FAQ Section */
        .faq-section .section-title {
            color: var(--text-color);
        }
        .faq-item {
            margin-bottom: var(--spacing-md);
            border-bottom: 1px solid var(--border-color);
            padding-bottom: var(--spacing-md);
        }
        .faq-question {
            font-weight: bold;
            color: var(--primary-color);
            cursor: pointer;
            position: relative;
            padding-left: var(--spacing-md);
        }
        .faq-question::before {
            content: '+';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.2rem;
            font-weight: bold;
            color: var(--secondary-color);
        }
        .faq-item.open .faq-question::before {
            content: '−';
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            color: var(--light-text-color);
            font-size: 0.95rem;
            margin-top: var(--spacing-sm);
            padding-left: var(--spacing-md);
        }
        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
        }

        /* 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);
            color: white;
        }
        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }
        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color var(--transition-speed), transform var(--transition-speed);
        }
        .cta-button:hover {
            background-color: var(--button-hover-bg);
            transform: translateY(-2px);
        }

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

        .footer-content {
            text-align: center;
        }

        .footer-logo {
            font-size: 1.75rem;
            font-weight: bold;
            color: var(--accent-color);
            margin-bottom: var(--spacing-md);
        }
        .footer-logo span {
            color: var(--secondary-color);
        }

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

        .footer-nav a {
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
        }

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

        .copyright {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                gap: var(--spacing-md);
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
        }

        @media (max-width: 768px) {
            .main-nav {
                padding: var(--spacing-sm) 0;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--background-color);
                padding: var(--spacing-md);
                box-shadow: var(--box-shadow);
                gap: 0;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                margin-bottom: var(--spacing-sm);
            }
            .nav-links a {
                display: block;
                padding: var(--spacing-sm) 0;
            }
            .mobile-nav-toggle {
                display: block;
            }
            .hero {
                min-height: 40vh;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .section {
                padding: var(--spacing-lg) 0;
            }
            .grid-container {
                grid-template-columns: 1fr;
            }
            .footer-nav {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
        }