/* roulang page: index */
:root {
            --primary-color: #e60000; /* Deep Red */
            --secondary-color: #000000; /* Black */
            --accent-color: #ffcc00; /* Gold */
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --button-hover-bg: #cc0000;
            --button-hover-text: #fff;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

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

        html {
            scroll-behavior: smooth;
        }

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

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

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

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

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

        .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.5);
            border: none;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: bold;
            text-align: center;
            cursor: pointer;
            transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
            margin: var(--spacing-unit) 0;
        }

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

        .btn-primary:hover {
            background-color: var(--button-hover-bg);
            color: var(--button-hover-text);
            box-shadow: var(--shadow-md);
        }

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

        .btn-secondary:hover {
            background-color: #333;
            color: #fff;
        }

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

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

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--accent-color);
        }
        .logo span {
            color: #fff;
        }

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

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

        .nav-links a {
            color: #fff;
            font-weight: bold;
            padding: calc(var(--spacing-unit) * 0.5) 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

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

        /* Mobile Menu Button (hidden on desktop) */
        .mobile-menu-icon {
            display: none;
            font-size: 2rem;
            cursor: pointer;
            color: #fff;
        }

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

        .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: 3.5rem;
            margin-bottom: var(--spacing-unit);
            text-shadow: 0 4px 8px rgba(0,0,0,0.3);
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            text-shadow: 0 2px 6px rgba(0,0,0,0.2);
        }

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

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

        /* Latest Content Section */
        .latest-content .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

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

        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
        }

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

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

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

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

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

        .card-footer {
            margin-top: auto;
            text-align: right;
        }

        .no-updates {
            text-align: center;
            font-size: 1.2rem;
            color: var(--light-text-color);
            padding: calc(var(--spacing-unit) * 3) 0;
        }


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

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

        .feature-item {
            padding: calc(var(--spacing-unit) * 2);
        }

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

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

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

        /* CTA Section */
        .cta {
            background-color: var(--secondary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            position: relative;
            overflow: hidden;
        }

        .cta::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            width: 100%;
            height: 200%;
            background: repeating-linear-gradient(
                45deg,
                rgba(255, 255, 255, 0.05),
                rgba(255, 255, 255, 0.05) 10px,
                transparent 10px,
                transparent 20px
            );
            transform: rotate(45deg) translate(-50%, -50%);
            z-index: 0;
        }

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

        .cta h2 {
            font-size: 2.8rem;
            margin-bottom: var(--spacing-unit) * 2;
            color: #fff;
        }

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

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

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

        footer .footer-logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--accent-color);
            margin-bottom: var(--spacing-unit) * 2;
        }

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

        .footer-section h3 {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-unit);
            color: #fff;
            border-bottom: 1px solid var(--light-text-color);
            padding-bottom: var(--spacing-unit) * 0.5;
        }

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

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

        .footer-section a {
            color: #ccc;
            transition: color 0.3s ease;
        }

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

        .footer-copyright {
            margin-top: calc(var(--spacing-unit) * 3);
            padding-top: var(--spacing-unit) * 2;
            border-top: 1px solid var(--light-text-color);
            font-size: 0.85rem;
            color: #bbb;
        }

        /* Responsive Design */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 3rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            section h2 {
                font-size: 2.2rem;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            footer .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            nav {
                padding: 0 var(--spacing-unit);
            }
            .nav-links {
                display: none; /* Hidden by default, shown by JS */
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--secondary-color);
                padding: var(--spacing-unit) 0;
            }
            .nav-links li {
                margin: 0;
                text-align: center;
                margin-bottom: var(--spacing-unit);
            }
            .nav-links a {
                display: block;
                padding: var(--spacing-unit);
                color: #fff;
            }
            .nav-links a.active::after {
                display: none;
            }
            .mobile-menu-icon {
                display: block;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 5) 0;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            section {
                padding: calc(var(--spacing-unit) * 3) 0;
            }
            section h2 {
                font-size: 2rem;
                margin-bottom: calc(var(--spacing-unit) * 2);
            }
            .latest-content .card-grid {
                grid-template-columns: 1fr;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .cta h2 {
                font-size: 2.2rem;
            }
            .cta p {
                font-size: 1.1rem;
                margin-bottom: var(--spacing-unit) * 2;
            }
            footer .container {
                grid-template-columns: 1fr;
            }
            footer .footer-copyright {
                margin-top: var(--spacing-unit) * 2;
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #ff4500; /* 鲜艳的橙红色 */
            --secondary-color: #ff6347; /* 柔和的橙红色 */
            --accent-color: #ffa07a; /* 珊瑚色，用于点缀 */
            --background-color: #f8f8f8; /* 浅灰色背景 */
            --text-color: #333;
            --weak-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            overflow-x: hidden;
        }

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

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

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

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

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

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

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

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

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

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

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) / 2) 0;
            position: relative;
            transition: color var(--transition-speed);
        }

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

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

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

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

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

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

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

        .hero-content p {
            font-size: 1.3em;
            max-width: 800px;
            margin: 0 auto;
        }

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

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

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

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

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

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

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

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

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

        .card-content .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.5);
            background-color: var(--primary-color);
            color: white;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-speed), transform var(--transition-speed);
            font-weight: bold;
            border: none;
            cursor: pointer;
        }

        .card-content .btn:hover,
        .card-content .btn:focus {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            text-decoration: none;
        }

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

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

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

        .cta-section .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
            background-color: white;
            color: var(--primary-color);
            border-radius: var(--border-radius);
            font-weight: bold;
            font-size: 1.1em;
            transition: background-color var(--transition-speed), color var(--transition-speed), transform var(--transition-speed);
            border: none;
            cursor: pointer;
        }

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

        footer {
            background-color: #333;
            color: #ccc;
            padding: calc(var(--spacing-unit) * 4) 0;
            font-size: 0.9em;
        }

        footer .container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

        .footer-section h3 {
            color: white;
            font-size: 1.4em;
            margin-bottom: var(--spacing-unit);
        }

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

        .footer-section ul li {
            margin-bottom: calc(var(--spacing-unit) / 2);
        }

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

        .footer-section a:hover {
            color: white;
            text-decoration: none;
        }

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

        .footer-copyright {
            text-align: center;
            padding: var(--spacing-unit) 0;
            margin-top: calc(var(--spacing-unit) * 3);
            border-top: 1px solid #444;
            font-size: 0.85em;
        }

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 6) 0;
        }
        .faq-section .container {
            max-width: 800px;
        }
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-unit);
            overflow: hidden;
        }
        .faq-question {
            background-color: #fdfdfd;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            font-weight: bold;
            cursor: pointer;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.5em;
            color: var(--weak-text-color);
            transition: transform var(--transition-speed);
        }
        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-out;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            background-color: var(--card-background);
        }
        .faq-answer p {
            padding: var(--spacing-unit) 0;
            margin-bottom: 0;
        }
        .faq-item.active .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            transition: max-height var(--transition-speed) ease-in;
        }

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

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

            .nav-links li {
                margin: var(--spacing-unit) 0;
                text-align: center;
            }

            .mobile-menu-icon {
                display: block;
            }

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

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

            .section-title {
                font-size: 2.2em;
            }

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

        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 2.2em;
            }
            .hero-content p {
                font-size: 1em;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
            footer .container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .hero-content h1 {
                font-size: 1.8em;
            }
            .section-title {
                font-size: 1.8em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .content-card img {
                height: 180px;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #4ecdc4;
            --accent-color: #f7cac9;
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --border-radius: 8px;
            --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
        }

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

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

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

        a:hover, a:focus {
            color: #e74c3c;
            text-decoration: underline;
        }

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

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

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

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

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

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

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

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

        .nav-links li a {
            color: var(--text-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit));
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

        .mobile-menu-icon {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            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: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 2);
            position: relative;
        }

        .hero::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, 0.5));
            z-index: 1;
        }

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

        .hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-unit);
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7);
        }

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.7);
        }

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

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

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

        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
            text-align: center;
        }

        .article-meta {
            text-align: center;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
            font-size: 0.9rem;
        }

        .article-meta span {
            margin: 0 calc(var(--spacing-unit) * 0.5);
        }

        .article-content {
            font-size: 1.1rem;
            color: var(--text-color);
            margin-top: calc(var(--spacing-unit) * 2);
        }

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

        .article-content img {
            margin: calc(var(--spacing-unit) * 2) auto;
            border-radius: var(--border-radius);
        }

        .article-content h3 {
            font-size: 1.8rem;
            margin-top: calc(var(--spacing-unit) * 3);
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

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

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

        .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 5) 0;
        }

        .no-content h2 {
            font-size: 2.5rem;
            color: var(--primary-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 .back-to-home {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            background-color: var(--primary-color);
            color: #fff;
            border-radius: var(--border-radius);
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
        }

        .no-content .back-to-home:hover {
            background-color: #e74c3c;
            transform: translateY(-2px);
            text-decoration: none;
        }

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

        footer .container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

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

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

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

        .footer-section h3 {
            font-size: 1.4rem;
            margin-bottom: var(--spacing-unit);
            color: var(--accent-color);
        }

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

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

        .footer-section a {
            color: #ccc;
            transition: color 0.3s ease;
        }

        .footer-section a:hover {
            color: #fff;
            text-decoration: underline;
        }

        .footer-copyright {
            text-align: center;
            padding: calc(var(--spacing-unit) * 2);
            margin-top: calc(var(--spacing-unit) * 3);
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px; /* Height of header */
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: var(--shadow);
                padding: var(--spacing-unit) 0;
            }

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

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

            .nav-links li a {
                display: block;
                width: 100%;
                padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            }

            .mobile-menu-icon {
                display: block;
            }

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

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

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

            .article-header h1 {
                font-size: 2rem;
            }

            .article-content {
                font-size: 1rem;
            }

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

/* roulang page: category2 */
:root {
            --primary-color: #e60026; /* 红色系 */
            --secondary-color: #ffcc00; /* 黄色系 */
            --background-color: #1a1a1a; /* 深灰背景 */
            --text-color: #ffffff; /* 白色文字 */
            --text-muted-color: #bbbbbb; /* 浅灰文字 */
            --border-color: #444444; /* 深灰边框 */
            --card-bg: #2a2a2a; /* 卡片背景 */
            --button-hover-bg: #cc001f;
            --button-active-bg: #a30017;
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
        }

        body {
            margin: 0;
            font-family: 'Arial', 'Microsoft YaHei', sans-serif;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }

        * {
            box-sizing: border-box;
        }

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

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

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

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

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

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

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

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

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

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

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp'); /* 分类页使用特定背景 */
            background-size: cover;
            background-position: center;
            height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 1;
        }

        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: var(--spacing-lg);
            background-color: rgba(0, 0, 0, 0.5);
            border-radius: var(--radius-lg);
        }

        .hero h1 {
            font-size: 3em;
            margin-bottom: var(--spacing-sm);
            color: var(--secondary-color);
            text-shadow: var(--shadow-md);
        }

        .hero p {
            font-size: 1.3em;
            color: var(--text-muted-color);
            text-shadow: var(--shadow-sm);
        }

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

        .section h2 {
            font-size: 2.5em;
            text-align: center;
            margin-bottom: var(--spacing-lg);
            position: relative;
            display: inline-block;
        }

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

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

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

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

        .card-image {
            position: relative;
            overflow: hidden;
        }

        .card-image img {
            width: 100%;
            height: 200px; /* 固定高度 */
            object-fit: cover; /* 裁剪填充 */
        }

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

        .card-title {
            font-size: 1.4em;
            margin-bottom: var(--spacing-sm);
            color: var(--secondary-color);
        }

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

        .card-footer {
            padding: var(--spacing-sm) var(--spacing-md);
            background-color: rgba(0, 0, 0, 0.3);
            text-align: right;
            border-top: 1px solid var(--border-color);
        }

        .card-footer a {
            font-weight: bold;
        }

        /* CTA Button */
        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--background-color);
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-md);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            border: none;
            cursor: pointer;
        }

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

        .cta-button:active {
            background-color: var(--button-active-bg);
            transform: translateY(0);
        }

        /* FAQ Section */
        .faq-section .container {
            max-width: 800px;
        }

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

        .faq-question {
            background-color: rgba(0,0,0,0.3);
            padding: var(--spacing-md);
            cursor: pointer;
            font-size: 1.1em;
            font-weight: bold;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.5em;
            color: var(--secondary-color);
            transition: transform 0.3s ease;
        }

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

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

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

        /* Footer */
        footer {
            background-color: #111;
            color: var(--text-muted-color);
            padding: var(--spacing-xl) 0 var(--spacing-sm);
            margin-top: var(--spacing-xl);
            border-top: 1px solid var(--border-color);
        }

        footer .container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-lg);
        }

        .footer-section h3 {
            color: var(--text-color);
            font-size: 1.3em;
            margin-bottom: var(--spacing-md);
        }

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

        .footer-section ul li {
            margin-bottom: var(--spacing-sm);
        }

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

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

        .footer-copyright {
            text-align: center;
            padding: var(--spacing-md) 0;
            margin-top: var(--spacing-lg);
            font-size: 0.9em;
            border-top: 1px solid #333;
        }

        /* Responsive */
        @media (max-width: 992px) {
            .nav-links {
                display: none; /* Hide desktop nav on smaller screens */
                flex-direction: column;
                position: absolute;
                top: 60px;
                left: 0;
                width: 100%;
                background-color: var(--background-color);
                padding: var(--spacing-md) 0;
                z-index: 1000;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                margin: var(--spacing-sm) 0;
                text-align: center;
            }
            .mobile-menu-icon {
                display: block;
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .section h2 {
                font-size: 2em;
            }
        }

        @media (max-width: 768px) {
            .hero {
                height: 40vh;
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 1em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            footer .container {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category3 */
:root {
        --primary-color: #ff4081; /* 活力粉 */
        --secondary-color: #ff80ab; /* 柔和粉 */
        --background-color: #fce4ec; /* 淡粉背景 */
        --text-color: #333;
        --subtle-text-color: #666;
        --border-color: #f8bbd0;
        --card-background: #ffffff;
        --button-hover-bg: #e91e63;
        --button-hover-text: #ffffff;
        --section-background: #ffffff;
        --card-border-radius: 12px;
        --container-max-width: 1200px;
        --spacing-xs: 8px;
        --spacing-sm: 16px;
        --spacing-md: 24px;
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --font-size-base: 16px;
        --font-size-h1: 3rem;
        --font-size-h2: 2.25rem;
        --font-size-h3: 1.75rem;
        --font-size-h4: 1.3rem;
        --line-height-base: 1.6;
        --transition-speed: 0.3s;
    }

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

    body {
        font-family: 'Arial', 'Microsoft YaHei', sans-serif;
        line-height: var(--line-height-base);
        color: var(--text-color);
        background-color: var(--background-color);
        scroll-behavior: smooth;
    }

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

    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 {
        margin-bottom: var(--spacing-md);
        line-height: 1.2;
        font-weight: bold;
    }

    h1 { font-size: var(--font-size-h1); }
    h2 { font-size: var(--font-size-h2); }
    h3 { font-size: var(--font-size-h3); }
    h4 { font-size: var(--font-size-h4); }

    /* Header */
    header {
        background-color: var(--section-background);
        padding: var(--spacing-md) 0;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

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

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

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

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

    .nav-links a {
        color: var(--text-color);
        font-weight: bold;
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--card-border-radius);
        transition: background-color var(--transition-speed), color var(--transition-speed);
    }

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

    .nav-links a:not(.active):hover {
        background-color: rgba(255, 64, 129, 0.1);
        color: var(--primary-color);
    }

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

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

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

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

    .hero h1 {
        font-size: var(--font-size-h1);
        margin-bottom: var(--spacing-md);
        text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    }

    .hero p {
        font-size: 1.4rem;
        margin-bottom: var(--spacing-lg);
        text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    }

    .cta-button {
        display: inline-block;
        background-color: var(--primary-color);
        color: white;
        padding: var(--spacing-sm) var(--spacing-lg);
        border-radius: var(--card-border-radius);
        font-weight: bold;
        font-size: 1.1rem;
        transition: background-color var(--transition-speed), transform var(--transition-speed);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

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

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

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

    .section p {
        text-align: center;
        color: var(--subtle-text-color);
        max-width: 800px;
        margin: 0 auto var(--spacing-lg);
    }

    /* Card Styles */
    .card {
        background-color: var(--card-background);
        border-radius: var(--card-border-radius);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        overflow: hidden;
        margin-bottom: var(--spacing-lg);
        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, 0.15);
    }

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

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

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

    .card-content p {
        font-size: 0.95rem;
        color: var(--subtle-text-color);
        margin-bottom: var(--spacing-md);
        text-align: left;
    }

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

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

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

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

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

    .faq-question {
        font-weight: bold;
        color: var(--primary-color);
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 1.1rem;
    }

    .faq-question::after {
        content: '+';
        font-size: 1.5rem;
        color: var(--secondary-color);
        transition: transform var(--transition-speed);
    }

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

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-speed) ease-in-out;
        font-size: 0.95rem;
        color: var(--subtle-text-color);
        padding-top: 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;
        margin: var(--spacing-xl) auto;
        border-radius: var(--card-border-radius);
    }

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

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

    .cta-section .cta-button {
        background-color: white;
        color: var(--primary-color);
        font-weight: bold;
        border: 2px solid white;
    }

    .cta-section .cta-button:hover {
        background-color: var(--button-hover-bg);
        color: white;
        border-color: var(--button-hover-bg);
    }

    /* Footer */
    footer {
        background-color: #333;
        color: #ccc;
        padding: var(--spacing-xl) 0 var(--spacing-sm);
        font-size: 0.9rem;
    }

    footer .container {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .footer-section {
        flex: 1;
        min-width: 200px;
        margin-right: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

    .footer-logo {
        font-size: 1.6rem;
        font-weight: bold;
        color: var(--primary-color);
        margin-bottom: var(--spacing-md);
    }
    .footer-logo span {
        color: var(--secondary-color);
    }

    .footer-section h3 {
        color: white;
        margin-bottom: var(--spacing-md);
        font-size: 1.2rem;
    }

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

    .footer-section li {
        margin-bottom: var(--spacing-sm);
    }

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

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

    .footer-copyright {
        text-align: center;
        padding: var(--spacing-md) 0;
        border-top: 1px solid #444;
        margin-top: var(--spacing-lg);
        font-size: 0.85rem;
        color: #999;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
        .nav-links {
            display: none;
            flex-direction: column;
            position: absolute;
            top: 70px; /* Adjust based on header height */
            left: 0;
            width: 100%;
            background-color: var(--card-background);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            padding: var(--spacing-md) 0;
        }

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

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

        .nav-links a {
            display: block;
            padding: var(--spacing-sm);
        }

        .mobile-menu-icon {
            display: block;
        }

        .hero h1 {
            font-size: 2.5rem;
        }
        .hero p {
            font-size: 1.2rem;
        }

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

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

        .footer-section {
            margin-right: 0;
            text-align: center;
        }
    }

/* roulang page: category4 */
:root {
            --primary-color: #e6007e;
            --secondary-color: #ffb3d1;
            --accent-color: #f0a030;
            --background-color: #f8f8f8;
            --text-color: #333;
            --text-muted-color: #777;
            --border-color: #ddd;
            --card-background: #fff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

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

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

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

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

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
        }

        button {
            background-color: var(--primary-color);
            color: white;
            cursor: pointer;
            border: none;
        }

        button:hover, button:focus {
            background-color: var(--accent-color);
            box-shadow: 0 4px 12px var(--shadow-color);
            transform: translateY(-2px);
        }

        /* Header & Navigation */
        header {
            background-color: #ffffff;
            padding: calc(var(--spacing-unit) * 0.5) 0;
            box-shadow: 0 2px 8px var(--shadow-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

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

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) * 0.5) 0;
            position: relative;
        }

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

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

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 2);
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

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

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

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

        .hero p {
            font-size: 1.4em;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .hero .cta-button {
            background-color: var(--accent-color);
            color: white;
            font-size: 1.2em;
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 4);
            border-radius: var(--border-radius);
            font-weight: bold;
            transition: transform 0.3s ease, background-color 0.3s ease;
        }

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

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

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

        .section-subtitle {
            font-size: 1.2em;
            color: var(--text-muted-color);
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 4);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 4px 15px var(--shadow-color);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px var(--shadow-color);
        }

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

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

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

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

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

        /* Feature Section */
        .features-section {
            background-color: #fff;
            padding: calc(var(--spacing-unit) * 6) 0;
        }

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

        .feature-item {
            padding: calc(var(--spacing-unit) * 2);
        }

        .feature-item i {
            font-size: 2.5em;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

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

        .feature-item p {
            font-size: 0.9em;
            color: var(--text-muted-color);
        }

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

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

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

        .faq-question::after {
            content: '+';
            position: absolute;
            right: var(--spacing-unit) * 2;
            font-size: 1.4em;
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            padding: 0 calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            color: var(--text-muted-color);
        }

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

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

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

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

        .cta-section .cta-button {
            background-color: var(--accent-color);
            color: var(--primary-color);
            font-size: 1.2em;
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 5);
            font-weight: bold;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, transform 0.3s ease;
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: #eee;
            padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 1.5);
            margin-top: auto; /* Pushes footer to the bottom */
        }

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

        .footer-section h3 {
            font-size: 1.4em;
            margin-bottom: var(--spacing-unit);
            color: white;
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: calc(var(--spacing-unit) * 0.5);
            display: inline-block;
        }

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

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

        .footer-section a {
            color: #ccc;
            transition: color 0.3s ease;
        }

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

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

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

        .footer-copyright {
            text-align: center;
            padding-top: var(--spacing-unit);
            border-top: 1px solid #444;
            font-size: 0.9em;
            color: #aaa;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px; /* Below header */
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: 0 4px 8px var(--shadow-color);
                padding: var(--spacing-unit) 0;
            }

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

            .nav-links li {
                text-align: center;
                margin: var(--spacing-unit) 0;
            }

            .mobile-menu-icon {
                display: block;
            }

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

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

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

            .card-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-section {
                text-align: center;
            }
        }

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