/* roulang page: index */
:root {
            --primary-color: #e91e63; /* 鲜艳粉红 */
            --secondary-color: #f50057; /* 亮粉红 */
            --background-color: #fce4ec; /* 淡粉背景 */
            --text-color: #333;
            --text-muted-color: #666;
            --border-color: #f8bbd0;
            --card-bg: #fff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --radius-medium: 8px;
            --radius-large: 16px;
            --spacing-unit: 16px;
            --container-width: 1200px;
            --transition-speed: 0.3s;
        }

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

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

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

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

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

        button, .btn {
            display: inline-block;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            background-color: var(--primary-color);
            color: #fff;
            border: none;
            border-radius: var(--radius-medium);
            cursor: pointer;
            font-size: 1rem;
            font-weight: bold;
            text-align: center;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            box-shadow: 0 4px 6px var(--shadow-color);
        }

        button:hover, .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 8px var(--shadow-color);
        }

        button:active, .btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 4px var(--shadow-color);
        }

        h1, h2, h3, h4, h5, h6 {
            margin-top: 0;
            margin-bottom: calc(var(--spacing-unit) * 0.8);
            line-height: 1.3;
            font-weight: bold;
            color: var(--primary-color);
        }

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

        .section {
            padding: calc(var(--spacing-unit) * 3) 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--primary-color);
        }

        /* Header & Navigation */
        header {
            background-color: var(--card-bg);
            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(--primary-color);
            text-decoration: none;
        }

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

        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 {
            color: var(--text-color);
            font-weight: bold;
            padding: 8px 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::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width var(--transition-speed) ease;
        }

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.3) 50%, rgba(0, 0, 0, 0) 100%);
        }

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

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

        .hero p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: rgba(255, 255, 255, 0.9);
            text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
        }

        .hero .btn {
            background-color: var(--secondary-color);
            font-size: 1.1rem;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2);
        }

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

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

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

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px var(--shadow-color);
        }

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

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

        .card-title {
            font-size: 1.5rem;
            margin-bottom: calc(var(--spacing-unit) * 0.5);
            color: var(--primary-color);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

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

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

        .card-link {
            display: block;
            margin-top: auto;
            text-align: right;
            font-weight: bold;
        }

        /* Featured Section */
        .featured-section {
            background-color: var(--card-bg);
            padding: calc(var(--spacing-unit) * 4) 0;
            border-radius: var(--radius-large);
            margin-top: calc(var(--spacing-unit) * 3);
        }

        .featured-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: calc(var(--spacing-unit) * 3);
            align-items: center;
        }

        .featured-image img {
            border-radius: var(--radius-large);
            box-shadow: 0 6px 12px var(--shadow-color);
        }

        .featured-text h3 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

        .featured-text p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-unit);
            color: var(--text-muted-color);
        }

        /* Latest Updates Section */
        .latest-updates {
            background-color: var(--card-bg);
            padding: calc(var(--spacing-unit) * 4) 0;
            border-radius: var(--radius-large);
            margin-top: calc(var(--spacing-unit) * 3);
        }

        .latest-updates-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .latest-updates-list li {
            display: flex;
            align-items: center;
            padding: var(--spacing-unit) 0;
            border-bottom: 1px dashed var(--border-color);
        }

        .latest-updates-list li:last-child {
            border-bottom: none;
        }

        .latest-updates-list a {
            font-weight: bold;
            color: var(--text-color);
            flex-grow: 1;
            transition: color var(--transition-speed) ease;
        }

        .latest-updates-list a:hover {
            color: var(--primary-color);
            text-decoration: none;
        }

        .latest-updates-list .meta {
            font-size: 0.85rem;
            color: var(--text-muted-color);
            margin-left: var(--spacing-unit);
        }

        .no-updates {
            text-align: center;
            font-style: italic;
            color: var(--text-muted-color);
            padding: var(--spacing-unit) 0;
        }

        /* FAQ Section */
        .faq-section {
            padding: calc(var(--spacing-unit) * 4) 0;
            background-color: var(--card-bg);
            border-radius: var(--radius-large);
            margin-top: calc(var(--spacing-unit) * 3);
        }

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

        .faq-question {
            background-color: var(--background-color);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.2);
            font-weight: bold;
            cursor: pointer;
            position: relative;
            color: var(--primary-color);
        }

        .faq-question::after {
            content: '+';
            position: absolute;
            right: var(--spacing-unit) * 1.2;
            font-size: 1.5rem;
            transition: transform var(--transition-speed) ease;
        }

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

        .faq-answer {
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.2);
            color: var(--text-muted-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
            background-color: #fff;
        }

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

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
            border-radius: var(--radius-large);
            margin-top: calc(var(--spacing-unit) * 3);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/assets/images/backpic/back-2.webp') center center repeat;
            opacity: 0.1;
            z-index: 0;
        }

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

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

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

        .cta-section .btn {
            background-color: var(--secondary-color);
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            font-size: 1.1rem;
            border-radius: var(--radius-large);
        }

        .cta-section .btn:hover {
            background-color: #fff;
            color: var(--primary-color);
            box-shadow: 0 6px 12px rgba(255, 255, 255, 0.3);
        }

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

        .footer-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
            margin-bottom: var(--spacing-unit);
            display: block;
        }

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

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

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

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

        .footer-copyright {
            font-size: 0.9rem;
            color: #aaa;
            margin-top: calc(var(--spacing-unit) * 1.5);
        }

        /* Responsive */
        @media (max-width: 992px) {
            .hero h1 { font-size: 2.8rem; }
            .hero p { font-size: 1.1rem; }
            .featured-grid { grid-template-columns: 1fr; }
            .featured-image img { margin-bottom: var(--spacing-unit) * 2; }
            nav ul { display: none; } /* Simplified for example, actual mobile nav needed */
        }

        @media (max-width: 768px) {
            .container { width: 95%; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
            .section { padding: calc(var(--spacing-unit) * 2) 0; }
            .hero { padding: calc(var(--spacing-unit) * 4) 0; }
            .hero h1 { font-size: 2.5rem; }
            .cards-grid { grid-template-columns: 1fr; }
            .cta-section h2 { font-size: 2rem; }
            .cta-section p { font-size: 1.1rem; }
            .footer-nav ul { flex-direction: column; }
            .footer-nav ul li { margin: var(--spacing-unit) 0; }
        }

        @media (max-width: 576px) {
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero .btn { padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5); }
            .cta-section .btn { padding: var(--spacing-unit) * 1.2 calc(var(--spacing-unit) * 2); }
            .logo { font-size: 1.5rem; }
        }

/* roulang page: article */
:root {
        --primary-color: #e91e63;
        --secondary-color: #f50057;
        --accent-color: #ff4081;
        --background-light: #ffffff;
        --background-dark: #f7f7f7;
        --text-primary: #333333;
        --text-secondary: #777777;
        --border-color: #e0e0e0;
        --card-background: #ffffff;
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
        --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.15);
        --border-radius-small: 4px;
        --border-radius-medium: 8px;
        --border-radius-large: 16px;
        --spacing-small: 8px;
        --spacing-medium: 16px;
        --spacing-large: 24px;
        --spacing-xlarge: 32px;
    }

    body {
        font-family: 'Helvetica Neue', Arial, sans-serif;
        line-height: 1.7;
        color: var(--text-primary);
        background-color: var(--background-light);
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    h1, h2, h3, h4, h5, h6 {
        margin-top: 0;
        margin-bottom: var(--spacing-medium);
        line-height: 1.3;
        font-weight: 700;
    }

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

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

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

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

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 var(--spacing-large);
    }

    header {
        background-color: var(--card-background);
        box-shadow: var(--shadow-light);
        padding: var(--spacing-medium) 0;
    }

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

    .logo {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--primary-color);
        text-decoration: none;
    }

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

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

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

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

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

    .hero {
        background-color: var(--background-dark);
        padding: var(--spacing-xlarge) 0;
        text-align: center;
        position: relative;
        overflow: hidden;
    }

    .hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-image: url('/assets/images/backpic/back-2.webp');
        background-size: cover;
        background-position: center;
        opacity: 0.2;
        z-index: 0;
    }

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

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

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

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

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

    .article-header {
        text-align: center;
        margin-bottom: var(--spacing-xlarge);
    }

    .article-header h1 {
        font-size: 2.75rem;
        color: var(--primary-color);
        margin-bottom: var(--spacing-small);
    }

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

    .article-content {
        font-size: 1.1rem;
        line-height: 1.8;
        color: var(--text-primary);
        max-width: 800px;
        margin: 0 auto;
    }

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

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

    .card {
        background-color: var(--card-background);
        border-radius: var(--border-radius-medium);
        box-shadow: var(--shadow-light);
        overflow: hidden;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        margin-bottom: var(--spacing-large);
    }

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

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

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

    .card-content h3 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-small);
        color: var(--primary-color);
    }

    .card-content p {
        font-size: 0.95rem;
        color: var(--text-secondary);
        margin-bottom: var(--spacing-medium);
    }

    .card-content .btn {
        display: inline-block;
        background-color: var(--accent-color);
        color: white;
        padding: var(--spacing-small) var(--spacing-medium);
        border-radius: var(--border-radius-small);
        font-weight: 500;
        transition: background-color 0.3s ease;
    }

    .card-content .btn:hover {
        background-color: var(--secondary-color);
        text-decoration: none;
    }

    .btn {
        display: inline-block;
        background-color: var(--primary-color);
        color: white;
        padding: var(--spacing-medium) var(--spacing-xlarge);
        border-radius: var(--border-radius-small);
        font-weight: 700;
        text-align: center;
        transition: background-color 0.3s ease, transform 0.3s ease;
        cursor: pointer;
        border: none;
    }

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

    .cta-section {
        background-color: var(--background-dark);
        padding: var(--spacing-xlarge) 0;
        text-align: center;
    }

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

    .cta-section p {
        font-size: 1.1rem;
        color: var(--text-secondary);
        margin-bottom: var(--spacing-large);
    }

    footer {
        background-color: #333;
        color: #fff;
        padding: var(--spacing-xlarge) 0;
        font-size: 0.9rem;
    }

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

    .footer-logo {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--primary-color);
        text-decoration: none;
        margin-bottom: var(--spacing-medium);
    }

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

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

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

    .footer-nav ul li a:hover {
        color: white;
        text-decoration: underline;
    }

    .footer-copyright {
        color: #aaa;
    }

    @media (max-width: 992px) {
        header nav {
            flex-direction: column;
        }
        header nav ul {
            margin-top: var(--spacing-medium);
            flex-wrap: wrap;
            justify-content: center;
        }
        header nav ul li {
            margin: 0 var(--spacing-small);
            margin-bottom: var(--spacing-small);
        }
        h1 { font-size: 2rem; }
        h2 { font-size: 1.75rem; }
        .hero h1 { font-size: 2.5rem; }
        .content-section h2 { font-size: 2rem; }
    }

    @media (max-width: 768px) {
        .container {
            padding: 0 var(--spacing-medium);
        }
        .logo, .footer-logo {
            font-size: 1.5rem;
        }
        header nav ul li {
            margin: 0 var(--spacing-xsmall);
        }
        .article-header h1 {
            font-size: 2rem;
        }
        .article-content {
            font-size: 1rem;
        }
        .card-content h3 {
            font-size: 1.1rem;
        }
    }

    @media (max-width: 576px) {
        .hero h1 { font-size: 2rem; }
        .hero p { font-size: 1rem; }
        .content-section { padding: var(--spacing-large) 0; }
        .content-section h2 { font-size: 1.75rem; margin-bottom: var(--spacing-medium); }
        .article-header h1 { font-size: 1.75rem; }
        .footer-nav ul {
            flex-direction: column;
            align-items: center;
        }
        .footer-nav ul li {
            margin: var(--spacing-xsmall) 0;
        }
    }

/* roulang page: category1 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉红 */
            --secondary-color: #f5f5f5; /* 浅灰色背景 */
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #eee;
            --hover-color: #d81b60;
            --background-color: #ffffff;
            --card-background: #ffffff;
            --footer-background: #212121;
            --footer-text-color: #bdbdbd;
            --container-width: 1200px;
            --spacing-unit: 16px;
            --card-border-radius: 8px;
            --button-border-radius: 4px;
            --shadow-normal: 0 2px 4px rgba(0,0,0,0.1);
            --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
        }

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

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

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

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

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

        .logo {
            font-size: 1.8em;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            letter-spacing: 1px;
        }

        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 {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            font-size: 1.1em;
            transition: color 0.3s ease;
            position: relative;
        }

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

        nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        .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: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
            margin-bottom: calc(var(--spacing-unit) * 4);
        }

        .hero h1 {
            font-size: 3em;
            margin-bottom: var(--spacing-unit);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }

        .hero p {
            font-size: 1.4em;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }

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

        .section h2 {
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 3);
            color: var(--primary-color);
        }

        .cards-container {
            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(--card-border-radius);
            box-shadow: var(--shadow-normal);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: left;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }

        .card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            display: block;
        }

        .card-content {
            padding: var(--spacing-unit) * 2;
        }

        .card-content h3 {
            font-size: 1.6em;
            margin-top: 0;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .card-content p {
            font-size: 1em;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .card-content .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            border-radius: var(--button-border-radius);
            text-decoration: none;
            font-weight: 500;
            transition: background-color 0.3s ease;
        }

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

        .faq-section {
            background-color: var(--background-color);
            margin-top: calc(var(--spacing-unit) * 4);
            padding-top: calc(var(--spacing-unit) * 4);
        }

        .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: 500;
            cursor: pointer;
            position: relative;
            padding-left: 30px;
            color: var(--text-color);
        }

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

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

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

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

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

        .cta-section h2 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-unit) * 2;
            color: white;
        }

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

        .cta-section .btn {
            background-color: var(--background-color);
            color: var(--primary-color);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 3);
            font-size: 1.2em;
            font-weight: 600;
            border-radius: var(--button-border-radius);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .cta-section .btn:hover {
            background-color: var(--hover-color);
            color: white;
        }

        footer {
            background-color: var(--footer-background);
            color: var(--footer-text-color);
            padding: calc(var(--spacing-unit) * 4) 0;
            text-align: center;
        }

        .footer-logo {
            font-size: 2em;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: block;
            margin-bottom: var(--spacing-unit) * 2;
        }

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

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

        .footer-nav ul li a {
            text-decoration: none;
            color: var(--footer-text-color);
            font-size: 1.1em;
            transition: color 0.3s ease;
        }

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

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

        /* Responsive adjustments */
        @media (max-width: 1024px) {
            nav.container {
                flex-wrap: wrap;
                justify-content: center;
            }
            nav ul {
                margin-top: var(--spacing-unit);
                justify-content: center;
                width: 100%;
            }
            nav ul li {
                margin: 0 var(--spacing-unit);
            }
            .logo {
                width: 100%;
                text-align: center;
                margin-bottom: var(--spacing-unit);
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.2em;
            }
            .section h2 {
                font-size: 2em;
            }
            .cards-container {
                grid-template-columns: 1fr;
            }
            .card img {
                height: 200px;
            }
        }

        @media (max-width: 768px) {
            .hero {
                padding: calc(var(--spacing-unit) * 6) 0;
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .section {
                padding: calc(var(--spacing-unit) * 3) 0;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav ul li {
                margin: var(--spacing-unit) 0;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉红 */
            --secondary-color: #f50057; /* 亮粉红 */
            --background-color: #ffffff; /* 白色背景 */
            --text-color: #333333; /* 深灰文字 */
            --weak-text-color: #777777; /* 浅灰弱化文字 */
            --border-color: #e0e0e0; /* 浅灰边框 */
            --card-background: #f8f8f8; /* 卡片背景 */
            --highlight-color: #ff80ab; /* 强调色 */
            --hover-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
            --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
            --container-max-width: 1200px;
            --container-padding: 15px;
            --border-radius: 8px;
            --spacing-unit: 16px;
        }

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

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

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

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

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

        .container {
            max-width: var(--container-max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--container-padding);
            padding-right: var(--container-padding);
        }

        header {
            background-color: var(--background-color);
            padding: var(--spacing-unit) 0;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        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);
            font-weight: 500;
            padding: 0.5em 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 {
            position: relative;
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) var(--container-padding);
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            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, 0.4);
        }

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

        .hero h1 {
            font-size: 3em;
            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(--secondary-color);
            color: white;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            border-radius: var(--border-radius);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            cursor: pointer;
        }

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

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

        .section h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: calc(var(--spacing-unit) * 3);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) * 0.5);
        }

        .section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

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

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

        .content-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

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

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

        .content-card h3 {
            font-size: 1.4em;
            margin-bottom: calc(var(--spacing-unit) * 0.8);
            color: var(--text-color);
        }

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

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

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

        .features-section .feature-item {
            display: flex;
            align-items: center;
            margin-bottom: calc(var(--spacing-unit) * 2);
            gap: var(--spacing-unit);
        }

        .features-section .feature-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .features-section .feature-image {
            flex: 1;
            text-align: center;
        }

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

        .features-section .feature-text {
            flex: 1;
        }

        .features-section .feature-text h3 {
            font-size: 1.8em;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
        }

        .features-section .feature-text p {
            font-size: 1.1em;
            color: var(--weak-text-color);
        }

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

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

        .faq-section .faq-question {
            font-size: 1.2em;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            padding-right: var(--spacing-unit);
            transition: color 0.3s ease;
        }

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

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

        .faq-section .faq-question.active::after {
            content: '-';
            color: var(--primary-color);
        }

        .faq-section .faq-answer {
            font-size: 1.05em;
            color: var(--weak-text-color);
            margin-top: var(--spacing-unit);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-section .faq-answer.open {
            max-height: 200px; /* Adjust as needed */
        }
        
        .cta-section {
            background-color: var(--primary-color);
            color: white;
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) var(--container-padding);
            position: relative;
            overflow: hidden;
        }
        
        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 500px;
            height: 500px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            animation: pulse 3s infinite ease-in-out;
        }
        
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
        }

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

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

        .cta-section .cta-button {
            background-color: white;
            color: var(--primary-color);
            border-radius: 50px; /* Pill shape */
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
            font-size: 1.2em;
            font-weight: bold;
        }

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

        @keyframes pulse {
            0% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.7; }
            50% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
            100% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.7; }
        }

        footer {
            background-color: #333333;
            color: #ffffff;
            padding: calc(var(--spacing-unit) * 3) 0;
            text-align: center;
        }

        footer .footer-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: white;
            text-decoration: none;
            display: block;
            margin-bottom: var(--spacing-unit);
        }

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

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

        footer .footer-nav ul li a {
            color: #bbbbbb;
            transition: color 0.3s ease;
        }

        footer .footer-nav ul li a:hover {
            color: white;
            text-decoration: underline;
        }

        footer .footer-copyright {
            font-size: 0.9em;
            color: #aaaaaa;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            nav ul {
                display: none; /* Hide desktop nav, implement mobile menu if needed */
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .section h2 {
                font-size: 2em;
            }
            .features-section .feature-item {
                flex-direction: column;
                text-align: center;
            }
            .features-section .feature-item:nth-child(even) {
                flex-direction: column;
            }
            .features-section .feature-image {
                margin-bottom: var(--spacing-unit);
            }
        }

        @media (max-width: 768px) {
            .hero {
                min-height: 40vh;
                padding: calc(var(--spacing-unit) * 4) var(--container-padding);
            }
            .hero h1 {
                font-size: 2em;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1em;
            }
            footer .footer-nav ul {
                flex-direction: column;
            }
            footer .footer-nav ul li {
                margin: calc(var(--spacing-unit) * 0.5) 0;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 1.5em;
            }
            .hero h1 {
                font-size: 1.8em;
            }
            .hero p {
                font-size: 1em;
            }
            .section h2 {
                font-size: 1.8em;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
                font-size: 1em;
            }
            .cta-section h2 {
                font-size: 1.8em;
            }
            .cta-section p {
                font-size: 0.95em;
            }
            .cta-section .cta-button {
                padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
                font-size: 1.1em;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #e91e63; /* Pink */
            --secondary-color: #f50057; /* Light Pink */
            --accent-color: #ff4081; /* Accent Pink */
            --background-color: #fce4ec; /* Very Light Pink */
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #f8bbd0;
            --card-background: #ffffff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            width: 100%;
        }

        /* Header & Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 10px var(--shadow-color);
            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: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            letter-spacing: 1px;
        }

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

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

        header nav ul li a {
            text-decoration: none;
            color: var(--light-text-color);
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: color 0.3s ease, background-color 0.3s ease;
        }

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

        /* Hero Section */
        .hero {
            background-image: linear-gradient(to bottom, rgba(233, 30, 99, 0.8), rgba(245, 0, 87, 0.8)), url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: white;
            padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 6);
            text-align: center;
            position: relative;
        }

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

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }

        /* Main Content Area */
        main {
            flex-grow: 1;
            padding: calc(var(--spacing-unit) * 6) 0;
        }

        /* Section Styling */
        .section {
            margin-bottom: calc(var(--spacing-unit) * 6);
            padding: calc(var(--spacing-unit) * 4) 0;
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            box-shadow: 0 4px 15px var(--shadow-color);
        }

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

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

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

        .feature-card {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 10px var(--shadow-color);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: center;
            padding-bottom: var(--spacing-unit);
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 20px var(--shadow-color);
        }

        .feature-card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            display: block;
        }

        .feature-card h3 {
            font-size: 1.6rem;
            margin: var(--spacing-unit) 0 var(--spacing-unit) * 0.5;
            color: var(--primary-color);
            padding: 0 var(--spacing-unit);
        }

        .feature-card p {
            font-size: 1rem;
            padding: 0 var(--spacing-unit);
            color: var(--light-text-color);
        }

        /* Call to Action Button */
        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 3);
            text-decoration: none;
            font-size: 1.1rem;
            font-weight: 700;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease, transform 0.2s ease;
            margin-top: var(--spacing-unit);
            border: none;
            cursor: pointer;
        }

        .cta-button:hover,
        .cta-button:focus {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 4px 10px rgba(255, 64, 129, 0.4);
        }

        /* FAQ Section */
        .faq-section {
            background-color: transparent;
            box-shadow: none;
        }

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

        .faq-item {
            background-color: white;
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-unit);
            box-shadow: 0 2px 8px var(--shadow-color);
        }

        .faq-question {
            font-size: 1.2rem;
            font-weight: 500;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            cursor: pointer;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

        .faq-item.active .faq-question::after {
            content: '-';
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-in-out, padding 0.3s ease-in-out;
            padding: 0 calc(var(--spacing-unit) * 1.5);
            color: var(--light-text-color);
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: white;
            padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 2);
            text-align: center;
            margin-top: auto; /* Pushes footer to the bottom */
        }

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

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            margin-bottom: var(--spacing-unit);
        }

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

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

        .footer-nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .footer-nav ul li a:hover {
            opacity: 1;
        }

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

        /* Responsive Design */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .section h2 {
                font-size: 2.2rem;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            header .container {
                flex-direction: column;
            }
            header nav ul {
                margin-top: var(--spacing-unit);
                flex-wrap: wrap;
                justify-content: center;
            }
            header nav ul li {
                margin: 0 calc(var(--spacing-unit) * 0.5);
                margin-bottom: calc(var(--spacing-unit) * 0.5);
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .section h2 {
                font-size: 2rem;
            }
            .faq-question {
                font-size: 1.1rem;
            }
            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav ul li {
                margin: var(--spacing-unit) 0;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 1.5rem;
            }
            header nav ul li a {
                padding: 0.5rem;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .section {
                padding: calc(var(--spacing-unit) * 3) 0;
            }
            .section h2 {
                font-size: 1.8rem;
                margin-bottom: var(--spacing-unit) * 2;
            }
            .feature-card img {
                height: 200px;
            }
            .feature-card h3 {
                font-size: 1.3rem;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
                font-size: 1rem;
            }
            .faq-item {
                margin-bottom: var(--spacing-unit);
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉色系 */
            --secondary-color: #ffc107; /* 亮黄色 */
            --background-color: #f8f9fa;
            --text-color: #343a40;
            --muted-text-color: #6c757d;
            --border-color: #dee2e6;
            --card-bg: #ffffff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
            --transition-fast: 0.2s ease-in-out;
        }

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

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            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 calc(var(--spacing-unit) * 1.5);
            width: 100%;
        }

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

        a:hover,
        a:focus {
            color: #d81b60;
            outline: none;
        }

        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; }
        h4 { font-size: 1.5rem; }
        h5 { font-size: 1.25rem; }
        h6 { font-size: 1rem; }

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

        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: var(--border-radius);
            background-color: var(--primary-color);
            color: #ffffff;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            text-align: center;
        }

        .btn:hover,
        .btn:focus {
            background-color: #d81b60;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: #ffffff;
        }

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

        .btn-secondary:hover,
        .btn-secondary:focus {
            background-color: #f5b000;
            color: var(--text-color);
        }

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

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

        .section-subtitle {
            text-align: center;
            font-size: 1.25rem;
            color: var(--muted-text-color);
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        /* Header & Navigation */
        header {
            background-color: #ffffff;
            box-shadow: var(--shadow-sm);
            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: 1.75rem;
            font-weight: 700;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

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

        header nav ul li a {
            font-weight: 500;
            color: var(--text-color);
            padding: 0.5rem 0;
            position: relative;
            transition: color var(--transition-fast);
        }

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

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

        /* Hero Section */
        .hero {
            background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('/assets/images/backpic/back-3.webp') no-repeat center center/cover;
            color: #ffffff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
            min-height: 60vh;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }

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

        .hero p {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto var(--spacing-unit) auto;
        }

        .hero .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            font-weight: 700;
            padding: 1rem 2rem;
        }
        .hero .btn:hover, .hero .btn:focus {
            background-color: #f5b000;
        }

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

        .category-content h2 {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--primary-color);
        }

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

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

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

        .card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
        }

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

        .card-title {
            font-size: 1.5rem;
            margin-bottom: calc(var(--spacing-unit) * 0.75);
            color: var(--primary-color);
        }

        .card-description {
            font-size: 0.95rem;
            color: var(--muted-text-color);
            flex-grow: 1;
        }

        .card-footer {
            margin-top: var(--spacing-unit);
        }

        .card .btn {
            width: 100%;
            padding: 0.75rem;
            font-weight: 700;
        }

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

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

        .faq-question {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-unit) 0;
        }

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

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

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

        .faq-item.open .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: 3rem;
            margin-bottom: var(--spacing-unit) * 2;
        }

        .cta-section p {
            font-size: 1.25rem;
            margin-bottom: calc(var(--spacing-unit) * 3);
            opacity: 0.9;
        }

        .cta-section .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            font-weight: 700;
            padding: 1rem 2.5rem;
        }

        .cta-section .btn:hover, .cta-section .btn:focus {
            background-color: #f5b000;
        }

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

        footer .container {
            text-align: center;
        }

        .footer-logo {
            font-size: 2rem;
            font-weight: 700;
            color: #ffffff;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: var(--spacing-unit) * 2;
            display: block;
        }

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

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

        .footer-nav ul li a {
            color: #ffffff;
            opacity: 0.8;
            transition: opacity var(--transition-fast);
        }

        .footer-nav ul li a:hover,
        .footer-nav ul li a:focus {
            opacity: 1;
            color: var(--secondary-color);
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            h1 { font-size: 2.25rem; }
            .hero h1 { font-size: 3rem; }
            .section-title { font-size: 2.25rem; }
            .cta-section h2 { font-size: 2.5rem; }

            header nav ul {
                display: none; /* Simple mobile menu hide for this example, actual impl. needs toggle */
            }
            .logo { font-size: 1.5rem; }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            .hero h1 { font-size: 2.5rem; }
            .hero { padding: calc(var(--spacing-unit) * 6) 0; }
            .hero p { font-size: 1.1rem; }

            .section-title { font-size: 2rem; }
            .section-subtitle { font-size: 1.1rem; }

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

            .cta-section {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .cta-section h2 { font-size: 2.25rem; }
            .cta-section p { font-size: 1.1rem; }

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

        @media (max-width: 520px) {
            .hero h1 { font-size: 2rem; }
            .hero { padding: calc(var(--spacing-unit) * 4) 0; min-height: 40vh; }
            .hero p { font-size: 1rem; }
            .hero .btn { padding: 0.8rem 1.5rem; }

            .section { padding: calc(var(--spacing-unit) * 3) 0; }
            .section-title { font-size: 1.75rem; margin-bottom: calc(var(--spacing-unit) * 1.5); }
            .section-subtitle { margin-bottom: calc(var(--spacing-unit) * 1.5); }

            .card-content { padding: var(--spacing-unit); }
            .card-title { font-size: 1.25rem; }
            .card-description { font-size: 0.9rem; }

            .faq-question { font-size: 1.1rem; }

            .cta-section h2 { font-size: 1.75rem; margin-bottom: var(--spacing-unit); }
            .cta-section p { font-size: 1rem; margin-bottom: calc(var(--spacing-unit) * 2); }
            .cta-section .btn { padding: 0.75rem 2rem; }

            footer { padding: calc(var(--spacing-unit) * 3) 0; }
            .footer-logo { font-size: 1.75rem; margin-bottom: var(--spacing-unit); }
        }

/* roulang page: category5 */
:root {
            --primary-color: #e91e63; /* Hot Pink */
            --secondary-color: #f50057; /* Deep Pink */
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #eee;
            --card-bg-color: #fff;
            --button-hover-bg: #c2185b;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --card-border-radius: 8px;
            --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

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

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

        body {
            font-family: var(--font-family);
            color: var(--text-color);
            background-color: var(--background-color);
            line-height: 1.7;
            overflow-x: hidden;
        }

        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 calc(var(--spacing-unit) * 1.5);
        }

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

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

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

        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: 500;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 0.5);
            transition: color 0.3s ease;
            position: relative;
        }

        nav ul li a.active {
            color: var(--primary-color);
            font-weight: bold;
        }
        
        nav ul li a.active::after, nav ul li a:not(.active):hover::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
            transition: all 0.3s ease;
        }
        nav ul li a:not(.active):hover::after {
            width: 50%;
            left: 25%;
            opacity: 0.7;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 8) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 50vh;
        }

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

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: var(--spacing-unit);
        }

        .hero h1 {
            font-size: 3.5em;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            line-height: 1.2;
            text-shadow: 0 2px 4px rgba(0,0,0,0.5);
        }

        .hero p {
            font-size: 1.3em;
            margin-bottom: calc(var(--spacing-unit) * 3);
            line-height: 1.5;
            text-shadow: 0 1px 2px rgba(0,0,0,0.4);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
            border-radius: 30px;
            font-size: 1.2em;
            font-weight: bold;
            box-shadow: var(--shadow-medium);
            transition: background-color 0.3s ease, transform 0.3s ease;
        }

        .cta-button:hover {
            background-color: var(--button-hover-bg);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(194, 24, 91, 0.3);
        }

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

        .section h2 {
            font-size: 2.5em;
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 4);
            position: relative;
            padding-bottom: calc(var(--spacing-unit) * 1.5);
        }
        
        .section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 3);
        }

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

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

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

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

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

        .card-description {
            font-size: 1em;
            color: var(--light-text-color);
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .card-link {
            display: inline-block;
            margin-top: auto; /* Push to bottom */
            font-weight: 500;
        }

        /* Feature Section */
        .feature-item {
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit) * 3);
            margin-bottom: calc(var(--spacing-unit) * 5);
        }

        .feature-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .feature-image {
            flex: 1;
            border-radius: var(--card-border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-medium);
        }
        .feature-image img {
            width: 100%;
            height: 350px;
            object-fit: cover;
        }

        .feature-text {
            flex: 1;
        }

        .feature-text h3 {
            font-size: 2em;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            color: var(--primary-color);
        }

        .feature-text p {
            font-size: 1.1em;
            color: var(--light-text-color);
        }

        /* FAQ Section */
        .faq-section .container {
            max-width: 800px;
        }
        
        .faq-item {
            background-color: var(--card-bg-color);
            border-radius: var(--card-border-radius);
            margin-bottom: var(--spacing-unit);
            box-shadow: var(--shadow-small);
            overflow: hidden;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: calc(var(--spacing-unit) * 1.5);
            cursor: pointer;
            font-weight: bold;
            transition: background-color 0.3s ease;
        }
        
        .faq-question:hover {
            background-color: #f0f0f0;
        }

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

        .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 calc(var(--spacing-unit) * 1.5);
            background-color: #fefefe;
        }

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

        .faq-answer p {
            color: var(--light-text-color);
        }

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 6) 0;
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 1;
        }

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

        .cta-section h2 {
            font-size: 3em;
            margin-bottom: calc(var(--spacing-unit) * 2);
        }

        .cta-section p {
            font-size: 1.2em;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }
        
        .cta-section .cta-button {
            background-color: #fff;
            color: var(--primary-color);
            border: 2px solid #fff;
        }
        .cta-section .cta-button:hover {
            background-color: transparent;
            color: #fff;
            border-color: #fff;
        }


        /* Footer */
        footer {
            background-color: #222;
            color: #ccc;
            padding: calc(var(--spacing-unit) * 4) 0;
            font-size: 0.9em;
        }

        footer .container {
            text-align: center;
        }

        .footer-logo {
            font-size: 1.8em;
            font-weight: bold;
            color: #fff;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: calc(var(--spacing-unit) * 2);
            display: block;
        }

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

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

        .footer-nav ul li a {
            color: #ccc;
            transition: color 0.3s ease;
        }
        .footer-nav ul li a:hover {
            color: #fff;
        }

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

        /* Responsive Design */
        @media (max-width: 992px) {
            nav.container {
                flex-wrap: wrap;
                justify-content: center;
            }
            nav ul {
                margin-top: var(--spacing-unit);
                justify-content: center;
            }
            nav ul li {
                margin: 0 calc(var(--spacing-unit) * 1);
            }
            .logo {
                width: 100%;
                text-align: center;
                margin-bottom: var(--spacing-unit);
            }

            .hero h1 {
                font-size: 2.8em;
            }
            .hero p {
                font-size: 1.1em;
            }
            
            .section h2 {
                font-size: 2.2em;
            }
            
            .feature-item {
                flex-direction: column;
            }
            .feature-item:nth-child(even) {
                flex-direction: column;
            }
            .feature-image {
                margin-bottom: var(--spacing-unit);
            }
        }

        @media (max-width: 768px) {
            html {
                font-size: 15px;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 6) 0;
                min-height: 40vh;
            }
            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1em;
            }
            .cta-button {
                padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
                font-size: 1em;
            }
            .section h2 {
                font-size: 2em;
                margin-bottom: calc(var(--spacing-unit) * 3);
            }
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .feature-item {
                margin-bottom: calc(var(--spacing-unit) * 4);
            }
            .feature-image img {
                height: 280px;
            }
            .feature-text h3 {
                font-size: 1.8em;
            }
            .cta-section h2 {
                font-size: 2.5em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
            .footer-nav ul {
                flex-direction: column;
            }
            .footer-nav ul li {
                margin: calc(var(--spacing-unit) * 0.5) 0;
            }
        }
        
        @media (max-width: 576px) {
            .logo {
                font-size: 1.5em;
            }
            .hero h1 {
                font-size: 2em;
            }
            .hero p {
                font-size: 0.95em;
            }
            .section h2 {
                font-size: 1.8em;
            }
            .feature-text h3 {
                font-size: 1.6em;
            }
            .cta-section h2 {
                font-size: 2em;
            }
            .cta-section p {
                font-size: 1em;
            }
        }