/* roulang page: index */
:root {
            --primary-color: #ff4081;
            --secondary-color: #f50057;
            --background-color: #f8f9fa;
            --text-color: #333;
            --muted-text-color: #777;
            --border-color: #ddd;
            --card-background: #fff;
            --card-shadow: 0 4px 15px rgba(0,0,0,0.08);
            --radius-small: 4px;
            --radius-medium: 8px;
            --radius-large: 16px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --container-max-width: 1200px;
            --hero-height: 500px;
            --header-height: 70px;
            --footer-height: 100px;
        }

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

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

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

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

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

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

        /* Header */
        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            height: var(--header-height);
            display: flex;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

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

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

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

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

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

        /* Mobile Menu Toggle (Hidden on Desktop) */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 2em;
            color: var(--text-color);
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            height: var(--hero-height);
            display: flex;
            align-items: center;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.7));
            z-index: 1;
        }

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

        .hero h1 {
            font-size: 3.5em;
            margin-bottom: var(--spacing-sm);
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 1.3em;
            color: rgba(255,255,255,0.9);
            margin-bottom: var(--spacing-lg);
        }

        .hero .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-large);
            font-size: 1.1em;
            font-weight: bold;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .hero .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: var(--card-shadow);
        }

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

        section:not(.hero) {
            background-color: var(--card-background);
        }

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

        section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: var(--spacing-lg);
            color: var(--text-color);
            letter-spacing: -0.5px;
        }

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

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

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
        }

        .category-card img {
            width: 100%;
            height: 180px; /* Fixed height for consistent card appearance */
            object-fit: cover; /* Ensure images cover the area */
        }

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

        .category-card h3 {
            font-size: 1.5em;
            color: var(--secondary-color);
            margin-bottom: var(--spacing-sm);
            text-align: center;
        }

        .category-card p {
            color: var(--muted-text-color);
            text-align: center;
            font-size: 0.95em;
        }

        .category-card .cta-button {
            display: block;
            width: fit-content;
            margin: var(--spacing-md) auto 0 auto;
            background-color: var(--primary-color);
            color: #fff;
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--radius-large);
            font-weight: bold;
            transition: background-color 0.3s ease;
        }

        .category-card .cta-button:hover {
            background-color: var(--secondary-color);
        }

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

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

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
        }

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

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

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

        .content-card .meta {
            font-size: 0.85em;
            color: var(--muted-text-color);
            margin-bottom: var(--spacing-md);
        }

        .content-card p {
            font-size: 0.9em;
            color: var(--muted-text-color);
            flex-grow: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            margin-bottom: var(--spacing-sm);
        }

        .content-card .read-more {
            display: inline-block;
            font-weight: bold;
            color: var(--primary-color);
            transition: color 0.3s ease;
        }

        .content-card .read-more:hover {
            color: var(--secondary-color);
        }

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

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--radius-medium);
            margin-bottom: var(--spacing-sm);
            box-shadow: var(--card-shadow);
        }

        .faq-item .question {
            padding: var(--spacing-md);
            cursor: pointer;
            font-weight: bold;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

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

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

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

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

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

        .cta .container {
            padding: var(--spacing-xl) 0;
            max-width: 700px;
        }

        .cta h2 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-sm);
            color: #fff;
        }

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

        .cta .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-large);
            font-size: 1.1em;
            font-weight: bold;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: rgba(255,255,255,0.7);
            padding: var(--spacing-lg) 0 var(--spacing-sm) 0;
            text-align: center;
            height: var(--footer-height);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        footer .container {
            max-width: var(--container-max-width);
        }

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

        footer p {
            margin-bottom: var(--spacing-md);
            font-size: 0.9em;
        }

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

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

        footer ul li a {
            color: rgba(255,255,255,0.7);
            transition: color 0.3s ease;
        }

        footer ul li a:hover {
            color: #fff;
        }

        .copyright {
            font-size: 0.85em;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 3em;
            }
            .hero p {
                font-size: 1.1em;
            }
            section h2 {
                font-size: 2.2em;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-xs: 6px;
                --spacing-sm: 12px;
                --spacing-md: 18px;
                --spacing-lg: 24px;
                --spacing-xl: 32px;
                --hero-height: 400px;
                --header-height: 60px;
                --footer-height: 90px;
            }

            header .container {
                flex-wrap: wrap;
            }

            .mobile-menu-toggle {
                display: block;
                order: 2; /* Move toggle to the right */
            }

            nav {
                order: 3; /* Move nav below logo/toggle */
                flex-basis: 100%;
                text-align: center;
                display: none; /* Hidden by default, shown via JS */
                padding-bottom: var(--spacing-sm);
            }

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

            nav ul li {
                margin: var(--spacing-sm) 0;
            }
            nav ul li a::after {
                display: none; /* No underline effect on mobile menu */
            }

            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1em;
            }

            .categories .container,
            .latest-content .container {
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            }

            section h2 {
                font-size: 2em;
            }

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

        @media (max-width: 576px) {
            :root {
                --spacing-xs: 5px;
                --spacing-sm: 10px;
                --spacing-md: 15px;
                --spacing-lg: 20px;
                --spacing-xl: 28px;
            }

            .logo {
                font-size: 1.5em;
            }
            .mobile-menu-toggle {
                font-size: 1.8em;
            }

            .hero {
                height: 350px;
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 0.95em;
            }
            .hero .cta-button {
                padding: var(--spacing-sm) var(--spacing-md);
                font-size: 1em;
            }

            .categories .container,
            .latest-content .container {
                grid-template-columns: 1fr; /* Stack cards vertically */
            }

            section h2 {
                font-size: 1.8em;
            }

            .cta h2 {
                font-size: 1.8em;
            }
            .cta p {
                font-size: 1em;
            }
            .cta .cta-button {
                padding: var(--spacing-sm) var(--spacing-md);
                font-size: 1em;
            }

            footer {
                height: auto;
                padding: var(--spacing-lg) 0 var(--spacing-sm) 0;
            }
            footer .site-name {
                font-size: 1.5em;
            }
            footer ul {
                flex-direction: column;
            }
            footer ul li {
                margin: var(--spacing-sm) 0;
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #ff4081;
            --secondary-color: #e91e63;
            --background-color: #f4f7f6;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #e0e0e0;
            --card-background: #ffffff;
            --button-hover-bg: #d81b60;
            --footer-bg: #333;
            --footer-text-color: #ccc;
            --container-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

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

        body {
            font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            scroll-behavior: smooth;
        }

        .container {
            max-width: var(--container-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(--secondary-color);
        }

        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: 2.5em; }
        h2 { font-size: 2em; }
        h3 { font-size: 1.75em; }
        h4 { font-size: 1.5em; }
        h5 { font-size: 1.25em; }
        h6 { font-size: 1em; }

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

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

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

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

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

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

        nav ul li a {
            color: var(--text-color);
            font-weight: bold;
            padding: calc(var(--spacing-unit) / 2) 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #ffffff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) var(--spacing-unit);
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

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

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

        .hero h1 {
            font-size: 3.5em;
            margin-bottom: var(--spacing-unit);
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }

        .hero p {
            font-size: 1.5em;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 1px 1px 6px rgba(0,0,0,0.5);
        }

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

        section .section-title {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 5);
        }

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

        section .section-title p {
            font-size: 1.2em;
            color: var(--light-text-color);
            max-width: 700px;
            margin: 0 auto;
        }

        /* Card Grid */
        .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);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

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

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

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

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

        .card .card-meta {
            font-size: 0.9em;
            color: var(--light-text-color);
            margin-bottom: var(--spacing-unit);
        }

        .card .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: #ffffff;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 2);
            border-radius: var(--border-radius);
            font-weight: bold;
            text-align: center;
            transition: background-color 0.3s ease;
            margin-top: auto; /* Push button to bottom */
        }

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

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: calc(var(--spacing-unit) * 3);
        }

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

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

        .faq-question {
            cursor: pointer;
            font-weight: bold;
            font-size: 1.2em;
            position: relative;
            padding-left: calc(var(--spacing-unit) * 2.5);
            display: block;
        }

        .faq-question::before {
            content: '+';
            position: absolute;
            left: 0;
            font-size: 1.4em;
            top: -2px;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            padding-left: calc(var(--spacing-unit) * 2.5);
            color: var(--light-text-color);
            margin-top: var(--spacing-unit);
        }

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

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

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

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

        .cta-section .btn {
            background-color: #ffffff;
            color: var(--primary-color);
            padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 3);
            font-size: 1.2em;
            border-radius: var(--border-radius);
            font-weight: bold;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .cta-section .btn:hover {
            background-color: var(--secondary-color);
            color: #ffffff;
        }

        /* Footer */
        footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 5) 0;
            text-align: center;
        }

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

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

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

        footer p {
            max-width: 700px;
            margin-bottom: calc(var(--spacing-unit) * 3);
            font-size: 1.1em;
        }

        footer ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        footer ul li {
            margin: 0 calc(var(--spacing-unit) * 2);
        }

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

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

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

        /* Responsive */
        @media (max-width: 1024px) {
            h1 { font-size: 2.2em; }
            h2 { font-size: 1.8em; }
            .hero h1 { font-size: 3em; }
            .hero p { font-size: 1.2em; }
            .card-grid {
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            }
        }

        @media (max-width: 768px) {
            header .container {
                flex-direction: column;
            }
            nav ul {
                flex-direction: column;
                margin-top: var(--spacing-unit);
            }
            nav ul li {
                margin: var(--spacing-unit) 0;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 6) var(--spacing-unit);
                min-height: 40vh;
            }
            .hero h1 { font-size: 2.5em; }
            .hero p { font-size: 1em; }
            section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            section .section-title {
                margin-bottom: calc(var(--spacing-unit) * 4);
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .faq-question {
                padding-left: calc(var(--spacing-unit) * 2);
            }
            .faq-answer {
                padding-left: calc(var(--spacing-unit) * 2);
            }
            footer ul {
                flex-direction: column;
            }
            footer ul li {
                margin: var(--spacing-unit) 0;
            }
        }

        @media (max-width: 520px) {
             h1 { font-size: 1.8em; }
            .hero h1 { font-size: 2em; }
            .hero { padding: calc(var(--spacing-unit) * 4) var(--spacing-unit); }
            .cta-section h2, .cta-section p, .cta-section .btn { font-size: 1.1em; }
            footer .site-name { font-size: 1.6em; }
        }

/* roulang page: article */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #feca57;
            --dark-color: #333;
            --light-color: #f8f8f8;
            --text-color: #333;
            --muted-text-color: #666;
            --border-color: #ddd;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.15);
            --container-max-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --font-family: 'Helvetica Neue', Arial, sans-serif;
            --line-height-base: 1.6;
        }

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

        html {
            font-size: 16px;
        }

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

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

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.2s ease-in-out;
        }

        a:hover {
            color: #ff8888;
        }

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

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

        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.75rem; }
        h4 { font-size: 1.5rem; }
        h5 { font-size: 1.25rem; }
        h6 { font-size: 1rem; }

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

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

        .btn:hover {
            background-color: #ff8888;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

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

        .btn-secondary:hover {
            background-color: #feca77;
        }

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

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

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

        .site-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }

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

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

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

        nav ul li a {
            font-size: 1.1rem;
            color: var(--dark-color);
            padding: var(--spacing-sm) 0;
            position: relative;
            transition: color 0.2s ease-in-out;
        }

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

        nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        /* Mobile Navigation */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--dark-color);
        }
        
        .mobile-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: #fff;
            box-shadow: var(--shadow-lg);
            padding: var(--spacing-md);
            z-index: 999;
        }
        
        .mobile-menu ul {
            flex-direction: column;
            align-items: center;
        }
        
        .mobile-menu ul li {
            margin: var(--spacing-sm) 0;
        }

        /* 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;
            padding: var(--spacing-xl) 0;
            text-align: center;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 50px;
            background-image: url("data:image/svg+xml,%3Csvg width='100' height='50' viewBox='0 0 100 50' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 50 C 20 20 40 0 100 0L100 50Z' fill='%23ffffff'/%3E%3C/svg%3E");
            background-repeat: repeat-x;
            background-position: bottom;
            background-size: 100px 50px;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: var(--spacing-md);
            text-shadow: var(--shadow-lg);
        }

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

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

        .content-section h2 {
            text-align: center;
            margin-bottom: var(--spacing-xl);
        }

        .article-content {
            background-color: #fff;
            padding: var(--spacing-xl);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            max-width: 900px;
            margin: 0 auto;
        }
        
        .article-content h2,
        .article-content h3 {
            color: var(--dark-color);
        }

        .article-content p {
            color: var(--muted-text-color);
            font-size: 1.05rem;
            margin-bottom: var(--spacing-md);
        }

        .article-content img {
            border-radius: var(--radius-md);
            margin: var(--spacing-lg) auto;
            box-shadow: var(--shadow-md);
        }
        
        .article-content strong {
            color: var(--primary-color);
        }

        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--spacing-lg);
            padding-bottom: var(--spacing-md);
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
            color: var(--muted-text-color);
        }

        .not-found {
            text-align: center;
            padding: var(--spacing-xl) 0;
        }

        .not-found h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-md);
        }

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

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

        .faq-question {
            background-color: #f9f9f9;
            padding: var(--spacing-md);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: bold;
            color: var(--dark-color);
            transition: background-color 0.2s ease-in-out;
        }

        .faq-question:hover {
            background-color: #f0f0f0;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.2s ease-in-out;
        }

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

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

        .faq-item.open .faq-answer {
            max-height: 500px; /* Adjust as needed */
            padding: var(--spacing-md);
        }

        .faq-answer p {
            margin-bottom: 0;
            color: var(--muted-text-color);
        }

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

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

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

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

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

        .site-name {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: var(--spacing-md);
        }

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

        footer p {
            text-align: center;
            margin-bottom: var(--spacing-lg);
            max-width: 600px;
            opacity: 0.8;
        }

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

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

        footer ul li a {
            color: #fff;
            opacity: 0.8;
            transition: opacity 0.2s ease-in-out;
        }

        footer ul li a:hover {
            opacity: 1;
        }

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

        /* Responsive Design */
        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: block;
            }

            nav ul {
                display: none; /* Hide desktop nav on small screens */
            }

            header .container {
                flex-wrap: wrap;
            }

            .site-logo {
                flex-basis: 100%;
                justify-content: center;
                margin-bottom: var(--spacing-sm);
            }

            .hero h1 {
                font-size: 2.5rem;
            }
            
            .hero p {
                font-size: 1.1rem;
            }

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

            .article-content {
                padding: var(--spacing-lg);
            }
            
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .article-meta div {
                margin-bottom: var(--spacing-sm);
            }

            .faq-question {
                font-size: 1rem;
                padding: var(--spacing-md);
            }
            
            .faq-answer {
                padding: var(--spacing-md);
            }

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

            footer ul li {
                margin: 0 var(--spacing-sm);
                margin-bottom: var(--spacing-sm);
            }
        }
        
        @media (max-width: 520px) {
            html { font-size: 15px; }
            .container { width: 95%; }
            
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }

            .btn { padding: var(--spacing-sm) var(--spacing-md); }
            
            .site-logo { font-size: 1.6rem; }
            
            footer .site-name { font-size: 1.8rem; }
        }

/* roulang page: category3 */
:root {
            --primary-color: #e91e63; /* Pink */
            --secondary-color: #ffc107; /* Amber */
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg: #ffffff;
            --button-hover-bg: #d81b60;
            --footer-bg: #343a40;
            --footer-text-color: #f8f9fa;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --hero-height: 400px;
            --nav-height: 70px;
        }

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

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

        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;
        }

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

        /* Header & Navigation */
        header {
            background-color: var(--card-bg);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
            padding: 0 var(--spacing-unit);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

        nav ul li a {
            font-size: 1.1rem;
            color: var(--text-color);
            font-weight: 500;
            padding: calc(var(--spacing-unit) / 2) 0;
            transition: color 0.3s ease;
            position: relative;
        }

        nav ul li a.active {
            color: var(--primary-color);
            font-weight: bold;
        }
        nav ul li a:hover {
            color: var(--primary-color);
            text-decoration: none;
        }

        /* Hamburger Menu (Mobile) */
        .hamburger {
            display: 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;
            height: var(--hero-height);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            position: relative;
            isolation: isolate;
        }
        .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;
            padding: var(--spacing-unit);
        }

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

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

        .hero-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.2rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            box-shadow: var(--box-shadow);
        }

        .hero-button:hover {
            background-color: var(--button-hover-bg);
            text-decoration: none;
            transform: translateY(-3px);
        }

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

        .section-title {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) / 2);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        /* Category Content Area */
        .category-content {
            margin-top: calc(var(--spacing-unit) * 3);
        }

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

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

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

        .category-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover; /* Cover the area, might crop */
            transition: transform 0.5s ease;
        }
        .category-card:hover .category-card-image img {
            transform: scale(1.05);
        }

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

        .category-card-title {
            font-size: 1.4rem;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
            flex-grow: 1;
        }

        .category-card-description {
            font-size: 0.95rem;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .category-card-link {
            display: inline-block;
            background-color: var(--primary-color);
            color: #ffffff;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.5);
            border-radius: var(--border-radius);
            font-weight: bold;
            text-align: center;
            transition: background-color 0.3s ease, transform 0.2s ease;
            margin-top: auto; /* Push to bottom */
        }

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

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

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

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

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
            border-radius: var(--border-radius);
            font-size: 1.3rem;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s ease;
            box-shadow: var(--box-shadow);
        }

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

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-bg);
            padding: calc(var(--spacing-unit) * 4) 0;
        }

        .faq-item {
            margin-bottom: calc(var(--spacing-unit) * 2);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            background-color: var(--card-bg);
        }

        .faq-question {
            background-color: var(--card-bg);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 1.5);
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease;
        }
        .faq-question:hover {
            background-color: #e9ecef;
        }

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

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

        .faq-answer {
            padding: 0 calc(var(--spacing-unit) * 1.5);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            font-size: 1rem;
            color: var(--light-text-color);
            border-top: 1px solid var(--border-color);
        }

        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 1.5);
        }

        /* Footer */
        footer {
            background-color: var(--footer-bg);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 2) 0;
            text-align: center;
            font-size: 0.95rem;
        }

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

        .site-name {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
        }
        .site-name span {
            color: var(--secondary-color);
        }

        footer p {
            max-width: 600px;
            margin-bottom: calc(var(--spacing-unit) * 2);
            opacity: 0.8;
        }

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

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

        footer ul li a {
            color: var(--footer-text-color);
            opacity: 0.9;
            transition: opacity 0.3s ease;
        }

        footer ul li a:hover {
            opacity: 1;
            text-decoration: underline;
        }

        .copyright {
            opacity: 0.7;
        }

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .container {
                padding: 0 calc(var(--spacing-unit) * 1.5);
            }
            .hero-content h1 {
                font-size: 2.5rem;
            }
            .hero-content p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 2.2rem;
            }
            .cta-section h2 {
                font-size: 2.4rem;
            }
        }

        @media (max-width: 768px) {
            header {
                padding: 0 var(--spacing-unit);
            }
            .logo {
                font-size: 1.5rem;
            }
            nav {
                display: none; /* Hidden by default */
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background-color: var(--card-bg);
                padding: var(--spacing-unit) 0;
                box-shadow: 0 5px 10px rgba(0,0,0,0.1);
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                text-align: center;
            }
            nav ul li {
                margin: var(--spacing-unit) 0;
            }
            .hamburger {
                display: block;
            }
            .hero {
                height: 300px;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .hero-content p {
                font-size: 1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .category-card-title {
                font-size: 1.2rem;
            }
            .cta-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .cta-section h2 {
                font-size: 2rem;
            }
            .cta-section p {
                font-size: 1.1rem;
            }
            footer ul {
                flex-direction: column;
            }
            footer ul li {
                margin: calc(var(--spacing-unit) / 2) 0;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e91e63; /* Pink */
            --secondary-color: #f06292; /* Light Pink */
            --accent-color: #ffc107; /* Amber */
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #e0e0e0;
            --card-background: #fff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Arial', 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 var(--transition-speed) ease;
        }

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

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

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            transition: all var(--transition-speed) ease;
        }

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 calc(var(--spacing-unit) * 1.5);
        }

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

        header .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(--accent-color);
        }

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

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

        nav ul li a {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--text-color);
            padding: var(--spacing-unit) 0;
            position: relative;
            transition: color var(--transition-speed) ease;
        }

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

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

        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 1.5);
            position: relative;
            border-radius: var(--border-radius);
            margin-top: calc(var(--spacing-unit) * 2);
        }

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

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

        .hero h1 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-unit);
        }

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

        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2.5);
            font-size: 1.2em;
            font-weight: bold;
            border-radius: var(--border-radius);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            box-shadow: var(--box-shadow);
        }

        .cta-button:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.2);
        }

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

        .section-title {
            text-align: center;
            font-size: 2.2em;
            margin-bottom: calc(var(--spacing-unit) * 4);
            position: relative;
            padding-bottom: var(--spacing-unit);
        }

        .section-title::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

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

        .video-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
        }

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

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

        .video-card h3 {
            font-size: 1.3em;
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
        }

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

        .video-card .details {
            font-size: 0.85em;
            color: var(--light-text-color);
            margin-top: auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .video-card .details span {
            background-color: var(--secondary-color);
            color: #fff;
            padding: 4px 8px;
            border-radius: 4px;
        }

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

        .features-section .feature-item {
            padding: var(--spacing-unit);
        }

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

        .features-section .feature-item h4 {
            font-size: 1.3em;
            margin-bottom: var(--spacing-unit) / 2;
        }

        .faq-section {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 5) 0;
            border-radius: var(--border-radius);
        }

        .faq-section .container {
            max-width: 800px;
        }

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

        .faq-question {
            background-color: #fefefe;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            font-weight: bold;
            cursor: pointer;
            position: relative;
            transition: background-color var(--transition-speed) ease;
        }

        .faq-question:hover {
            background-color: #f0f0f0;
        }

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

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

        .faq-answer {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
            background-color: var(--card-background);
        }

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

        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 3) 0;
            margin-top: calc(var(--spacing-unit) * 5);
            text-align: center;
        }

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

        footer .site-name {
            font-size: 1.8em;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
        }
        footer .site-name span {
            color: var(--accent-color);
        }

        footer p {
            max-width: 600px;
            margin-bottom: calc(var(--spacing-unit) * 2);
            font-size: 1em;
        }

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

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

        footer ul li a {
            color: var(--footer-text-color);
            transition: color var(--transition-speed) ease;
        }

        footer ul li a:hover {
            color: #fff;
            text-decoration: underline;
        }

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

        /* Responsive Design */
        @media (max-width: 992px) {
            .features-section .container {
                grid-template-columns: repeat(2, 1fr);
            }
            nav ul {
                flex-direction: column;
                align-items: center;
                display: none; /* Mobile menu hidden by default */
            }
            nav ul.open {
                display: flex;
                position: absolute;
                top: 70px; /* Adjust based on header height */
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: var(--box-shadow);
                padding-bottom: var(--spacing-unit);
            }
            nav ul li {
                margin: var(--spacing-unit) 0;
            }
            .mobile-menu-toggle {
                display: block;
                font-size: 2em;
                cursor: pointer;
                color: var(--text-color);
            }
            .hero h1 {
                font-size: 2.2em;
            }
            .hero p {
                font-size: 1.1em;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 var(--spacing-unit);
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 1em;
            }
            .section-title {
                font-size: 1.8em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .features-section .container {
                grid-template-columns: 1fr;
            }
            footer ul {
                flex-direction: column;
            }
            footer ul li {
                margin: var(--spacing-unit) 0;
            }
        }

        @media (max-width: 576px) {
            .logo {
                font-size: 1.5em;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 4) var(--spacing-unit);
            }
            .cta-button {
                font-size: 1em;
                padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            }
        }

        /* Specific additions for mobile menu */
        .mobile-menu-toggle {
            display: none;
            order: 1; /* Ensure it's on the right if needed */
            margin-left: auto;
        }

/* roulang page: category5 */
:root {
            --primary-color: #e91e63;
            --secondary-color: #ff9800;
            --background-color: #f8f9fa;
            --text-color: #333;
            --weak-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --footer-background: #333;
            --footer-text-color: #ccc;
            --hover-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
            --border-radius: 8px;
            --spacing-unit: 16px;
            --container-max-width: 1200px;
        }

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

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

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-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 {
            background-color: var(--card-background);
            padding: var(--spacing-unit) 0;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        }

        .header .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(--secondary-color);
        }

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

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

        nav ul li a {
            font-weight: 500;
            color: var(--text-color);
            padding: 8px 12px;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

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

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

        .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: 3em;
            margin-bottom: var(--spacing-unit) * 0.5;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
        }

        .hero p {
            font-size: 1.2em;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
            max-width: 800px;
            margin: 0 auto;
        }

        .main-content {
            flex: 1;
            padding: var(--spacing-unit) * 3 0;
        }

        .section-title {
            text-align: center;
            font-size: 2.2em;
            margin-bottom: var(--spacing-unit) * 2;
            position: relative;
            padding-bottom: var(--spacing-unit) * 0.5;
        }

        .section-title::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

        .content-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

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

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

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

        .card-content h3 {
            font-size: 1.4em;
            margin-bottom: var(--spacing-unit) * 0.5;
            color: var(--text-color);
        }

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

        .card-actions {
            padding: var(--spacing-unit);
            text-align: right;
        }

        .btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: var(--border-radius);
            font-weight: 500;
            transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
            cursor: pointer;
            border: none;
            text-decoration: none;
        }

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

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

        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: var(--spacing-unit) * 4 0;
            margin-top: var(--spacing-unit) * 3;
        }

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

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

        .btn-secondary {
            background-color: var(--secondary-color);
            color: #fff;
            font-size: 1.1em;
        }

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

        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: var(--spacing-unit) * 3 0;
            margin-top: auto;
        }

        footer .container {
            text-align: center;
        }

        footer .site-name {
            font-size: 1.8em;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
        }

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

        footer p {
            margin-bottom: var(--spacing-unit) * 2;
            font-size: 0.95em;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

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

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

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

        footer ul li a:hover {
            color: #fff;
        }

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

        /* Responsive Design */
        @media (max-width: 768px) {
            nav ul {
                flex-direction: column;
                align-items: center;
                margin-top: var(--spacing-unit);
            }

            nav ul li {
                margin: 5px 0;
            }

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

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

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

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

            footer ul {
                flex-direction: column;
            }

            footer ul li {
                margin: 5px 0;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e91e63;
            --secondary-color: #ff9800;
            --background-color: #f8f9fa;
            --text-color: #333;
            --weak-text-color: #666;
            --border-color: #ddd;
            --card-bg: #fff;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --rounded-corner: 8px;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --font-family: 'Helvetica Neue', Arial, sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: var(--font-family);
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            margin: 0;
            padding: 0;
        }
        .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(--secondary-color);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            border-radius: var(--rounded-corner);
            transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
        }
        .btn {
            display: inline-block;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            background-color: var(--primary-color);
            color: #fff;
            font-size: 1.1em;
            border-radius: var(--rounded-corner);
            text-align: center;
            margin-top: calc(var(--spacing-unit) * 1.5);
            box-shadow: var(--shadow);
        }
        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0,0,0,0.15);
        }
        .btn.btn-secondary {
            background-color: var(--secondary-color);
        }
        .btn.btn-secondary:hover {
            background-color: var(--primary-color);
        }

        /* Header & Navigation */
        header {
            background-color: #fff;
            box-shadow: var(--shadow);
            padding: var(--spacing-unit) 0;
        }
        header .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(--secondary-color);
        }
        nav ul {
            list-style: none;
            display: flex;
        }
        nav ul li {
            margin-left: calc(var(--spacing-unit) * 2);
        }
        nav ul li a {
            font-size: 1.1em;
            color: var(--text-color);
            padding: var(--spacing-unit) 0;
            position: relative;
            transition: color 0.3s ease;
        }
        nav ul li a:hover, nav ul li a.active {
            color: var(--primary-color);
        }
        nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.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;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
        }
        .hero .container {
            position: relative;
            z-index: 1;
        }
        .hero h1 {
            font-size: 3em;
            margin-bottom: var(--spacing-unit);
            line-height: 1.3;
        }
        .hero p {
            font-size: 1.3em;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: rgba(255,255,255,0.9);
        }

        /* Content Section */
        .content-section {
            padding: calc(var(--spacing-unit) * 6) 0;
        }
        .content-section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 4);
            color: var(--primary-color);
        }

        /* Card Section */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }
        .card {
            background-color: var(--card-bg);
            border-radius: var(--rounded-corner);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.2);
        }
        .card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .card-content {
            padding: calc(var(--spacing-unit) * 2);
        }
        .card-content h3 {
            font-size: 1.4em;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-content p {
            font-size: 0.95em;
            color: var(--weak-text-color);
            margin-bottom: var(--spacing-unit);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-content .card-meta {
            font-size: 0.85em;
            color: var(--weak-text-color);
            margin-top: calc(var(--spacing-unit) * 1.5);
        }

        /* FAQ Section */
        .faq-section {
            background-color: #fff;
            padding: calc(var(--spacing-unit) * 6) 0;
        }
        .faq-section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 4);
            color: var(--primary-color);
        }
        .faq-item {
            margin-bottom: var(--spacing-unit);
            border-bottom: 1px solid var(--border-color);
            padding-bottom: var(--spacing-unit);
        }
        .faq-question {
            font-size: 1.2em;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-unit) 0;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.5em;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-question::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            font-size: 1em;
            color: var(--weak-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding-left: var(--spacing-unit);
            margin-top: var(--spacing-unit);
        }
        .faq-item.open .faq-answer {
            max-height: 200px; /* Adjust as needed */
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
        }
        .cta-section h2 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-unit);
        }
        .cta-section p {
            font-size: 1.3em;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }
        .cta-section .btn {
            background-color: var(--secondary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
            font-size: 1.2em;
        }
        .cta-section .btn:hover {
            background-color: #fff;
            color: var(--primary-color);
        }

        /* Footer */
        footer {
            background-color: #333;
            color: #ccc;
            padding: calc(var(--spacing-unit) * 4) 0;
            text-align: center;
        }
        footer .container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .site-name {
            font-size: 2em;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
        }
        .site-name span {
            color: var(--secondary-color);
        }
        footer p {
            font-size: 0.95em;
            margin-bottom: calc(var(--spacing-unit) * 2);
            max-width: 600px;
            color: #bbb;
        }
        footer ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }
        footer ul li {
            margin: 0 calc(var(--spacing-unit) * 1.5);
        }
        footer ul li a {
            color: #ccc;
            transition: color 0.3s ease;
        }
        footer ul li a:hover {
            color: var(--secondary-color);
        }
        .copyright {
            font-size: 0.85em;
            color: #888;
        }

        /* Responsive */
        @media (max-width: 992px) {
            nav ul {
                display: none; /* Hide nav on desktop, mobile menu needed */
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .content-section h2, .faq-section h2, .cta-section h2 {
                font-size: 2em;
            }
        }
        @media (max-width: 768px) {
            .hero {
                padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 2);
            }
            .hero h1 {
                font-size: 2.2em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            footer ul {
                flex-direction: column;
            }
            footer ul li {
                margin-bottom: var(--spacing-unit);
            }
        }