/* roulang page: index */
:root {
            --primary-color: #e91e63; /* 亮粉色 */
            --secondary-color: #f57f17; /* 橙黄色 */
            --background-color: #f8f8f8; /* 浅灰色背景 */
            --text-color: #333; /* 深灰色文字 */
            --muted-text-color: #777; /* 浅灰色文字 */
            --border-color: #ddd; /* 浅灰色边框 */
            --card-background: #fff; /* 白色卡片背景 */
            --button-hover-bg: #d81b60; /* 深粉色hover */
            --footer-bg: #333; /* 深灰色页脚背景 */
            --footer-text-color: #ccc; /* 浅灰色页脚文字 */
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

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

        html {
            font-size: 16px;
            line-height: 1.6;
            scroll-behavior: smooth;
        }

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

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

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

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

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

        /* Container */
        .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: 0 2px 10px rgba(0,0,0,0.05);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .logo:hover {
            text-decoration: none;
            color: var(--button-hover-bg);
        }

        .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) / 2) 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

        .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%;
        }

        .menu-toggle {
            display: none; /* Hidden by default on desktop */
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--text-color);
            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: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            min-height: 500px;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            text-shadow: 0 3px 8px rgba(0,0,0,0.3);
        }

        .hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto var(--spacing-unit) auto;
            text-shadow: 0 2px 5px rgba(0,0,0,0.3);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            margin-top: var(--spacing-unit);
        }

        .cta-button:hover {
            background-color: var(--secondary-color); /* Keep primary for hover */
            filter: brightness(110%);
            transform: translateY(-3px);
            text-decoration: none;
        }

        /* Section Styles */
        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);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) * 1.5);
        }

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

        /* Feature Section */
        .features {
            background-color: var(--card-background);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 2.5);
        }

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

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

        .feature-card img {
            max-width: 60px;
            margin: 0 auto calc(var(--spacing-unit) * 1.5);
        }

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

        .feature-card p {
            color: var(--muted-text-color);
        }

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

        .content-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 2.5);
        }

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

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

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

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

        .content-card-body h3 {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .content-card-meta {
            font-size: 0.9rem;
            color: var(--muted-text-color);
            margin-bottom: calc(var(--spacing-unit) * 1.5);
        }

        .content-card-excerpt {
            font-size: 0.95rem;
            color: var(--muted-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
            flex-grow: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .content-card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: auto;
        }

        .read-more-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.5);
            border-radius: var(--border-radius);
            font-weight: bold;
            transition: background-color 0.3s ease;
        }

        .read-more-button:hover {
            background-color: var(--button-hover-bg);
            text-decoration: none;
        }

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

        .cta h2 {
            font-size: 2.2rem;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
        }

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

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

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

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

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

        .faq-question {
            font-size: 1.2rem;
            font-weight: bold;
            color: var(--primary-color);
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
            cursor: pointer;
            position: relative;
            display: block;
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: calc(var(--spacing-unit) * 2);
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            font-size: 1rem;
            color: var(--muted-text-color);
            padding: 0 calc(var(--spacing-unit) * 2);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-in-out, padding 0.3s ease-in-out;
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
        }

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

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

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

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

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

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

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

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

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

            .nav-links {
                display: none; /* Hidden by default on mobile */
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: 0 4px 10px rgba(0,0,0,0.1);
                padding: var(--spacing-unit) 0;
                z-index: 999;
            }

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

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

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

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

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

/* roulang page: article */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉色/红色 */
            --secondary-color: #f50057; /* 辅助的深粉色 */
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #eee;
            --card-bg: #fff;
            --footer-bg: #333;
            --footer-text-color: #aaa;
            --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            --card-border-radius: 8px;
            --section-padding: 60px 0;
            --container-max-width: 1200px;
            --container-padding: 15px;
            --transition-speed: 0.3s;
        }

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

        body {
            margin: 0;
            font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            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(--container-padding);
        }

        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;
        }

        h1, h2, h3, h4, h5, h6 {
            margin-top: 0;
            margin-bottom: 1rem;
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-color);
        }

        h1 { font-size: 2.8rem; }
        h2 { font-size: 2.2rem; margin-bottom: 1.5rem;}
        h3 { font-size: 1.8rem; margin-bottom: 1rem;}
        h4 { font-size: 1.4rem; }

        .btn {
            display: inline-block;
            padding: 12px 28px;
            border: none;
            border-radius: 5px;
            background-color: var(--primary-color);
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            text-transform: uppercase;
            cursor: pointer;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            box-shadow: 0 5px 15px rgba(233, 30, 99, 0.4);
        }

        .btn:hover, .btn:focus {
            background-color: var(--secondary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(245, 0, 87, 0.5);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn-secondary {
            background-color: var(--secondary-color);
            box-shadow: 0 5px 15px rgba(245, 0, 87, 0.4);
        }
        .btn-secondary:hover, .btn-secondary:focus {
            background-color: var(--primary-color);
            box-shadow: 0 8px 20px rgba(233, 30, 99, 0.5);
        }

        .section {
            padding: var(--section-padding);
        }

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

        .content-wrapper {
            margin-top: 40px;
            background-color: var(--card-bg);
            padding: 40px;
            border-radius: var(--card-border-radius);
            box-shadow: var(--card-shadow);
        }

        .article-title {
            font-size: 2.5rem;
            margin-bottom: 15px;
            text-align: center;
            color: var(--text-color);
        }

        .article-meta {
            text-align: center;
            color: var(--light-text-color);
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .article-meta span {
            margin: 0 10px;
        }

        .article-content p {
            margin-bottom: 1.5em;
            color: var(--light-text-color);
        }

        .article-content img {
            margin: 30px auto;
            border-radius: var(--card-border-radius);
            box-shadow: var(--card-shadow);
        }

        .article-content a {
            font-weight: 500;
        }

        .no-content {
            text-align: center;
            padding: 60px 0;
            font-size: 1.5rem;
            color: var(--light-text-color);
        }
        .no-content a {
            display: inline-block;
            margin-top: 20px;
            padding: 12px 30px;
            font-size: 1.1rem;
        }

        /* Footer */
        footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: 40px 0 30px;
            margin-top: auto; /* Pushes footer to the bottom */
            text-align: center;
        }

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

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

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

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

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

        .copyright {
            margin: 0;
            font-size: 0.9rem;
        }

        /* Header/Nav */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
        }
        header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .logo:hover {
            text-decoration: none;
            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: 1.1rem;
            font-weight: 500;
            color: var(--text-color);
            padding: 10px 0;
            position: relative;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary-color);
        }
        .nav-links a.active::after, .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--text-color);
        }

        /* Responsive */
        @media (max-width: 992px) {
            .nav-links {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: #fff;
                padding: 20px 0;
                box-shadow: 0 5px 15px rgba(0,0,0,0.1);
                display: none; /* Hidden by default */
                text-align: center;
            }
            .nav-links.active {
                display: flex; /* Show when active */
            }
            .nav-links li {
                margin: 10px 0;
            }
            .nav-links a.active::after, .nav-links a:hover::after {
                width: 0; /* Remove underline on mobile nav */
            }
            .menu-toggle {
                display: block;
            }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
        }

        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .section-title { font-size: 1.8rem; }
            .section { padding: 40px 0; }
            .content-wrapper { padding: 25px; }
            .article-title { font-size: 2rem; }
            .btn { padding: 10px 20px; font-size: 0.9rem; }
            .footer-links { flex-direction: column; }
            .footer-links li { margin: 5px 0; }
        }

/* roulang page: category1 */
:root {
            --primary-color: #e53e3e; /* Red */
            --secondary-color: #805ad5; /* Purple */
            --background-color: #1a202c; /* Dark background */
            --text-color: #edf2f7; /* Light text */
            --muted-text-color: #a0aec0; /* Muted text */
            --border-color: #2d3748; /* Darker border */
            --card-background: #2d3748; /* Dark card background */
            --button-hover-bg: #f56565; /* Lighter red for hover */
            --button-hover-text: #ffffff;
            --rounded-lg: 0.5rem;
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.5);
            --container-max-width: 1280px;
            --spacing-unit: 1rem;
            --section-padding: calc(var(--spacing-unit) * 4);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            scroll-behavior: smooth;
        }

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

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

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

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

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

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

        .btn {
            display: inline-block;
            padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
            background-color: var(--primary-color);
            color: var(--text-color);
            border: none;
            border-radius: var(--rounded-lg);
            cursor: pointer;
            font-weight: bold;
            text-align: center;
            transition: background-color 0.3s ease, transform 0.2s ease;
            box-shadow: var(--shadow-lg);
        }

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

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

        .btn-secondary:hover {
            background-color: #714db9; /* Darker purple */
        }

        /* Header */
        header {
            background-color: var(--card-background);
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            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(--text-color);
            letter-spacing: 1px;
        }

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

        .nav-links li a {
            color: var(--muted-text-color);
            font-weight: 500;
            transition: color 0.3s ease;
        }

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

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

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

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

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

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--muted-text-color);
            max-width: 800px;
            margin: 0 auto var(--spacing-unit);
        }

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

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

        .content-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(--rounded-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.6);
        }

        .content-card img {
            width: 100%;
            height: 250px; /* Fixed height for cover images */
            object-fit: cover;
        }

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

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

        .card-body p {
            color: var(--muted-text-color);
            margin-bottom: var(--spacing-unit);
            flex-grow: 1;
        }

        .card-body .btn {
            margin-top: auto; /* Pushes button to the bottom */
            display: block;
            width: 100%;
        }

        /* Feature Section */
        .feature-section {
            background-color: var(--card-background);
            padding: var(--section-padding) 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .feature-section h2 {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--text-color);
        }

        .feature-list {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
            text-align: center;
        }

        .feature-list li {
            padding: var(--spacing-unit);
        }

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

        .feature-list li h4 {
            font-size: 1.25rem;
            color: var(--text-color);
            margin-bottom: calc(var(--spacing-unit) / 2);
        }

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

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

        .faq-section h2 {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--text-color);
        }

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--rounded-lg);
            margin-bottom: var(--spacing-unit);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .faq-question {
            padding: calc(var(--spacing-unit) * 1.5);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: bold;
            color: var(--text-color);
            transition: background-color 0.3s ease;
        }

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

        .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-out;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            background-color: var(--card-background);
            color: var(--muted-text-color);
        }

        .faq-answer p {
            padding: calc(var(--spacing-unit) * 1.5) 0;
        }

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

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

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

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

        /* Footer */
        footer {
            background-color: var(--card-background);
            color: var(--muted-text-color);
            padding: calc(var(--spacing-unit) * 3) 0;
            text-align: center;
            border-top: 1px solid var(--border-color);
        }

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

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

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

        .copyright {
            font-size: 0.9rem;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            .hero h1 { font-size: 2.8rem; }
            .hero p { font-size: 1rem; }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                padding: var(--spacing-unit) 0;
                box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            }

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

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

            .menu-toggle {
                display: block;
            }

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

        @media (max-width: 520px) {
            .hero h1 { font-size: 2.2rem; }
            .logo { font-size: 1.5rem; }
            .btn {
                padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 1);
            }
            .footer-links {
                flex-direction: column;
                gap: var(--spacing-unit);
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e91e63; /* Pink */
            --secondary-color: #f50057; /* Deep Pink */
            --background-color: #ffffff;
            --text-color: #333333;
            --muted-text-color: #777777;
            --border-color: #eeeeee;
            --card-background: #f9f9f9;
            --footer-background: #f5f5f5;
            --button-hover-bg: #d81b60;
            --button-active-bg: #c2185b;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --rounded-corners: 8px;
            --spacing-unit: 1rem;
            --container-max-width: 1200px;
            --breakpoint-md: 768px;
            --breakpoint-sm: 576px;
        }

        * {
            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);
            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(--secondary-color);
        }

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

        /* Header & Navigation */
        header {
            background-color: var(--background-color);
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 4px var(--shadow-color);
            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(--text-color);
            letter-spacing: 1px;
        }
        .logo:hover {
            color: var(--primary-color);
        }

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

        .nav-links li a {
            font-size: 1.1rem;
            color: var(--text-color);
            padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit));
            border-radius: var(--rounded-corners);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 2rem;
            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: var(--background-color);
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) var(--spacing-unit);
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1;
        }

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

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

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--background-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            font-size: 1.2rem;
            font-weight: bold;
            border-radius: var(--rounded-corners);
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: 0 4px 10px var(--shadow-color);
        }

        .cta-button:hover {
            background-color: var(--button-hover-bg);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px var(--shadow-color);
        }
        .cta-button:active {
            transform: translateY(0);
            background-color: var(--button-active-bg);
        }

        /* Main Content Sections */
        main {
            flex: 1;
            padding: calc(var(--spacing-unit) * 4) 0;
        }

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

        .section h2 {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            line-height: 1.2;
        }

        .section-description {
            text-align: center;
            font-size: 1.2rem;
            color: var(--muted-text-color);
            max-width: 800px;
            margin: 0 auto calc(var(--spacing-unit) * 3);
        }

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

        .feature-card {
            background-color: var(--card-background);
            border-radius: var(--rounded-corners);
            padding: calc(var(--spacing-unit) * 3);
            box-shadow: 0 4px 15px var(--shadow-color);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: center;
            border: 1px solid var(--border-color);
        }

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

        .feature-card img {
            width: 80px;
            height: 80px;
            margin: 0 auto calc(var(--spacing-unit) * 2);
            border-radius: var(--rounded-corners);
            object-fit: cover;
        }

        .feature-card h3 {
            font-size: 1.6rem;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

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

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

        .faq-list {
            list-style: none;
            max-width: 800px;
            margin: 0 auto;
            border-radius: var(--rounded-corners);
            overflow: hidden;
            box-shadow: 0 4px 15px var(--shadow-color);
        }

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

        .faq-question {
            font-size: 1.2rem;
            font-weight: bold;
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background-color 0.3s ease;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }

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

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

        .faq-answer {
            font-size: 1rem;
            color: var(--muted-text-color);
            padding: 0 calc(var(--spacing-unit) * 2);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease-out, padding 0.5s ease-out;
            background-color: var(--background-color);
        }
        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
        }

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

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

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

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

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


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

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

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

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

        .copyright {
            font-size: 0.9rem;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                gap: var(--spacing-unit);
            }
            .nav-links li a {
                font-size: 1rem;
                padding: calc(var(--spacing-unit) / 2);
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .section h2 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--background-color);
                padding: var(--spacing-unit) 0;
                box-shadow: 0 4px 6px var(--shadow-color);
                border-radius: 0 0 var(--rounded-corners) var(--rounded-corners);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                text-align: center;
                width: 100%;
            }
            .nav-links li a {
                display: block;
                padding: var(--spacing-unit);
            }
            .menu-toggle {
                display: block;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section h2 {
                font-size: 2rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .footer-links {
                flex-direction: column;
                gap: calc(var(--spacing-unit) / 2);
            }
        }
        
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .section h2 {
                font-size: 1.8rem;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
                font-size: 1.1rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #e91e63;
            --secondary-color: #f50057;
            --accent-color: #ff4081;
            --background-color: #121212;
            --surface-color: #1e1e1e;
            --text-primary: #ffffff;
            --text-secondary: #b3b3b3;
            --text-disabled: #757575;
            --border-color: #333333;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.3);
            --spacing-xs: 8px;
            --spacing-sm: 12px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --container-max-width: 1200px;
        }

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

        body {
            font-family: 'Arial', sans-serif;
            line-height: 1.6;
            background-color: var(--background-color);
            color: var(--text-primary);
            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(--accent-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

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

        button {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }

        /* Header */
        header {
            background-color: var(--surface-color);
            padding: var(--spacing-sm) 0;
            box-shadow: var(--shadow-sm);
        }

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

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

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

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

        .nav-links a {
            color: var(--text-secondary);
            font-size: 1.1rem;
            font-weight: 500;
            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-primary);
        }

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: var(--text-primary);
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-md);
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 50vh;
        }

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

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

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

        .hero p {
            font-size: 1.3rem;
            margin-bottom: var(--spacing-lg);
            color: var(--text-secondary);
        }

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

        .hero .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(245, 0, 87, 0.5);
        }

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

        .section h2 {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: var(--spacing-lg);
            position: relative;
            padding-bottom: var(--spacing-sm);
        }

        .section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: var(--radius-sm);
        }

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

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

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
        }

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

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

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

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

        .content-card .details {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.9rem;
            color: var(--text-disabled);
            margin-top: auto; /* Pushes details to the bottom */
        }

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

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

        .faq-question {
            background-color: var(--surface-color);
            color: var(--text-primary);
            font-size: 1.2rem;
            font-weight: 500;
            padding: var(--spacing-md);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background-color 0.3s ease;
        }

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

        .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 0.4s ease-out, padding 0.4s ease-out;
            padding: 0 var(--spacing-md);
            background-color: var(--background-color);
            color: var(--text-secondary);
            font-size: 1rem;
        }

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

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

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

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }

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

        .cta-section .cta-button:hover {
            background-color: var(--text-secondary);
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(255, 255, 255, 0.4);
        }

        /* Footer */
        footer {
            background-color: var(--surface-color);
            padding: var(--spacing-lg) 0;
            margin-top: auto; /* Pushes footer to the bottom */
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

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

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

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

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

        .copyright {
            font-size: 0.9rem;
            color: var(--text-disabled);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 60px;
                left: 0;
                width: 100%;
                background-color: var(--surface-color);
                box-shadow: var(--shadow-md);
                padding-bottom: var(--spacing-md);
            }

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

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

            .nav-links a {
                padding: var(--spacing-sm);
                width: 90%;
                margin: 0 auto;
                display: block;
            }

            .menu-toggle {
                display: block;
            }

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

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

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

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

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

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

/* roulang page: category4 */
:root {
            --primary-color: #e91e63; /* Pink, vibrant */
            --secondary-color: #2196f3; /* Blue, complementary */
            --background-color: #f8f9fa;
            --text-color: #333;
            --muted-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg-color: #ffffff;
            --hover-bg-color: #eef3f6;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --card-border-radius: 8px;
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-size-base: 1rem;
            --font-size-h1: 2.5rem;
            --font-size-h2: 2rem;
            --font-size-h3: 1.75rem;
            --font-size-h4: 1.5rem;
            --line-height-base: 1.6;
        }

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

        body {
            font-family: var(--font-family);
            line-height: var(--line-height-base);
            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: #c2185b;
            text-decoration: underline;
        }

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

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

        /* Header & Navigation */
        header {
            background-color: var(--card-bg-color);
            box-shadow: 0 2px 4px var(--shadow-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

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

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

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

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

        .menu-toggle {
            display: none;
            background: none;
            border: 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) var(--spacing-md);
            min-height: 60vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            position: relative;
        }

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

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

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

        .hero p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }

        .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-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: 0 4px 8px var(--shadow-color);
        }

        .cta-button:hover,
        .cta-button:focus {
            background-color: #c2185b;
            transform: translateY(-2px);
            text-decoration: none;
            color: white;
        }

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

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

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

        /* Gallery Section */
        .gallery-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: var(--spacing-lg);
        }

        .gallery-item {
            background-color: var(--card-bg-color);
            border-radius: var(--card-border-radius);
            overflow: hidden;
            box-shadow: 0 4px 12px var(--shadow-color);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .gallery-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px var(--shadow-color);
        }

        .gallery-item img {
            width: 100%;
            height: 300px; /* Fixed height for consistent grid */
            object-fit: cover; /* Ensures image covers the area without distortion */
        }

        .gallery-item-info {
            padding: var(--spacing-md);
            text-align: center;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .gallery-item-info h3 {
            font-size: var(--font-size-h4);
            margin-bottom: var(--spacing-sm);
            color: var(--primary-color);
        }

        .gallery-item-info p {
            font-size: 0.9rem;
            color: var(--muted-text-color);
        }

        /* About Section */
        .about-section {
            background-color: var(--card-bg-color);
            padding: var(--spacing-xl) 0;
            text-align: center;
        }

        .about-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .about-content p {
            margin-bottom: var(--spacing-md);
            color: var(--muted-text-color);
        }

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

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

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

        .faq-question {
            padding: var(--spacing-md);
            background-color: var(--card-bg-color);
            cursor: pointer;
            font-weight: bold;
            position: relative;
            transition: background-color 0.3s ease;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--primary-color);
            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-out;
            padding: 0 var(--spacing-md);
            background-color: var(--background-color);
            color: var(--muted-text-color);
        }

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

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

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

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-lg);
            color: rgba(255, 255, 255, 0.9);
        }

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

        .cta-section .cta-button:hover,
        .cta-section .cta-button:focus {
            background-color: transparent;
            color: white;
            border-color: white;
        }

        /* Footer */
        footer {
            background-color: #343a40;
            color: white;
            padding: var(--spacing-lg) 0 var(--spacing-sm);
            text-align: center;
        }

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

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

        .footer-links a {
            color: white;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

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

        .copyright {
            font-size: 0.8rem;
            color: var(--muted-text-color);
            margin-bottom: var(--spacing-sm);
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--card-bg-color);
                padding: var(--spacing-md);
                box-shadow: 0 4px 8px var(--shadow-color);
            }

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

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

            .menu-toggle {
                display: block;
            }

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

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

            .gallery-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 576px) {
            .hero {
                min-height: 50vh;
                padding: var(--spacing-lg) var(--spacing-sm);
            }

            .hero h1 {
                font-size: 1.6rem;
            }

            .hero p {
                font-size: 0.95rem;
            }

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

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

            .gallery-item img {
                height: 250px;
            }

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

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