/* roulang page: index */
:root {
            --primary-color: #e91e63; /* 活力粉 */
            --secondary-color: #ffc107; /* 阳光黄 */
            --accent-color: #9c27b0; /* 魅惑紫 */
            --background-color: #f8f9fa;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-bg-color: #fff;
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --shadow-normal: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.12);
            --transition-base: all 0.3s ease;
        }

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

        body {
            font-family: 'Arial', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            overflow-x: hidden;
        }

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

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

        img {
            display: block;
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
        }

        h1, h2, h3, h4, h5, h6 {
            margin-bottom: var(--spacing-unit);
            line-height: 1.4;
            font-weight: 600;
        }

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

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

        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: var(--border-radius);
            background-color: var(--primary-color);
            color: #fff;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            text-decoration: none;
            transition: var(--transition-base);
            box-shadow: var(--shadow-normal);
        }

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

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

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

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

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

        .section-title h2 {
            font-size: 2.2rem;
            position: relative;
            display: inline-block;
            padding-bottom: var(--spacing-unit);
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

        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;
        }

        .logo:hover {
            text-decoration: none;
        }

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

        .nav-links a {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-color);
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition-base);
        }

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

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

        /* 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) * 7) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
        }

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

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

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

        .hero p {
            font-size: 1.3rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: rgba(255, 255, 255, 0.9);
        }

        .hero .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            font-weight: 600;
            font-size: 1.2rem;
            padding: 1rem 2.5rem;
        }

        .hero .btn:hover,
        .hero .btn:focus {
            background-color: var(--accent-color);
            color: #fff;
        }

        /* Content Cards */
        .card {
            background-color: var(--card-bg-color);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-normal);
            overflow: hidden;
            transition: var(--transition-base);
            display: flex;
            flex-direction: column;
        }

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

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

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

        .card-content h3 {
            margin-bottom: calc(var(--spacing-unit) * 0.75);
            font-size: 1.3rem;
            color: var(--primary-color);
        }

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

        .card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: var(--spacing-unit);
            border-top: 1px solid var(--border-color);
            padding-top: var(--spacing-unit);
            font-size: 0.85rem;
            color: var(--light-text-color);
        }

        .card-tags span {
            display: inline-block;
            background-color: #eee;
            color: var(--light-text-color);
            padding: 0.2rem 0.6rem;
            border-radius: 10px;
            margin-right: 0.3rem;
            font-size: 0.75rem;
        }

        .card-link {
            display: inline-block;
            margin-top: var(--spacing-unit);
            font-weight: 500;
            color: var(--primary-color);
        }

        .card-link:hover {
            text-decoration: none;
        }

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

        /* Latest Content Section */
        .latest-content .section-title h2::after {
            background-color: var(--secondary-color);
        }

        /* Featured Categories Section */
        .featured-categories .section-title h2::after {
            background-color: var(--accent-color);
        }

        .featured-categories .card {
            border-left: 4px solid var(--primary-color);
        }
        .featured-categories .card:hover {
            border-left-color: var(--accent-color);
        }

        .featured-categories .card-content h3 {
            color: var(--accent-color);
        }

        /* Call to Action Section */
        .cta {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
            position: relative;
        }

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

        .cta p {
            font-size: 1.2rem;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: rgba(255, 255, 255, 0.9);
        }

        .cta .btn {
            background-color: var(--secondary-color);
            color: var(--text-color);
            font-weight: 600;
            font-size: 1.2rem;
            padding: 1rem 2.5rem;
        }

        .cta .btn:hover,
        .cta .btn:focus {
            background-color: var(--accent-color);
            color: #fff;
        }

        /* FAQ Section */
        .faq .section-title h2::after {
            background-color: var(--secondary-color);
        }

        .faq-item {
            margin-bottom: var(--spacing-unit);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
            background-color: var(--card-bg-color);
            cursor: pointer;
            transition: var(--transition-base);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-normal);
        }

        .faq-question {
            font-weight: 500;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--primary-color);
        }

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

        .faq-item.open .faq-question::after {
            content: '-';
        }

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

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

        /* Footer */
        footer {
            background-color: #333;
            color: #ccc;
            padding: calc(var(--spacing-unit) * 3) 0;
            text-align: center;
            font-size: 0.9rem;
        }

        .footer-content .site-name {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: var(--spacing-unit);
        }

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

        .footer-links a {
            color: #ccc;
            transition: var(--transition-base);
        }

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

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

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .hero h1 { font-size: 2.8rem; }
            .hero p { font-size: 1.1rem; }
            .card-grid {
                grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            }
        }

        @media (max-width: 768px) {
            nav {
                flex-direction: column;
                padding-bottom: var(--spacing-unit);
            }
            .logo {
                margin-bottom: var(--spacing-unit);
            }
            .nav-links ul {
                flex-direction: column;
                gap: var(--spacing-unit);
                text-align: center;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 5) 0;
                min-height: 45vh;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section-title h2 {
                font-size: 1.8rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .cta h2 {
                font-size: 2rem;
            }
            .cta p {
                font-size: 1rem;
            }
        }

        @media (max-width: 576px) {
            .container {
                width: 95%;
            }
            .hero {
                padding: calc(var(--spacing-unit) * 4) 0;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .btn {
                padding: 0.6rem 1.2rem;
                font-size: 0.9rem;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #e91e63; /* Pink */
            --secondary-color: #f50057; /* Deep Pink */
            --accent-color: #ffc107; /* Amber */
            --background-color: #f8f8f8;
            --text-color: #333;
            --light-text-color: #777;
            --border-color: #ddd;
            --card-bg: #fff;
            --card-shadow: 0 4px 12px rgba(0,0,0,0.1);
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --section-padding: calc(var(--spacing-unit) * 4) 0;
            --border-radius: 8px;
        }

        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        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;
        }

        button {
            font-family: inherit;
        }

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

        /* Header & Nav */
        header {
            background-color: var(--card-bg);
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            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);
            letter-spacing: 1px;
        }
        .logo:hover {
            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 {
            font-weight: 500;
            padding: 0.5em 0;
            position: relative;
            color: var(--text-color);
            transition: color 0.3s ease;
        }

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

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

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

        /* Main Content Area */
        main {
            padding: var(--section-padding);
        }

        /* Article Specific Styles */
        .article-header {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .article-header h1 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-unit);
            line-height: 1.3;
            color: var(--text-color);
        }

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

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

        .article-content h2,
        .article-content h3 {
            margin-top: calc(var(--spacing-unit) * 2);
            margin-bottom: var(--spacing-unit);
            color: var(--text-color);
            line-height: 1.4;
        }

        .article-content h2 {
            font-size: 1.8em;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: calc(var(--spacing-unit) / 2);
        }

        .article-content h3 {
            font-size: 1.4em;
        }

        .article-content p {
            margin-bottom: var(--spacing-unit);
            font-size: 1.1em;
        }

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

        .article-content li {
            margin-bottom: calc(var(--spacing-unit) / 2);
        }

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

        .article-content .no-content {
            text-align: center;
            padding: calc(var(--spacing-unit) * 4) 0;
            font-size: 1.2em;
            color: var(--light-text-color);
        }

        .article-content .no-content a {
            display: inline-block;
            margin-top: var(--spacing-unit);
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 2);
            background-color: var(--primary-color);
            color: #fff;
            border-radius: var(--border-radius);
            transition: background-color 0.3s ease;
        }

        .article-content .no-content a:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
        }

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

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

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

        .footer-links ul li a {
            color: #ccc;
            font-size: 0.9em;
            transition: color 0.3s ease;
        }

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

        .copyright {
            font-size: 0.85em;
            color: #aaa;
            margin-top: var(--spacing-unit);
        }

        .copyright a {
            color: #aaa;
            transition: color 0.3s ease;
        }

        .copyright a:hover {
            color: #fff;
        }

        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .logo {
                font-size: 1.5em;
            }

            nav ul {
                flex-direction: column;
                align-items: center;
                width: 100%;
                display: none; /* Hidden by default, shown by JS toggle */
            }

            nav ul.open {
                display: flex;
            }

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

            .article-header h1 {
                font-size: 2.2em;
            }

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

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

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

        @media (max-width: 480px) {
            .logo {
                font-size: 1.3em;
            }

            .article-header h1 {
                font-size: 1.8em;
            }
        }

/* roulang page: category1 */
:root {
            --primary-color: #e91e63; /* 鲜艳的粉色 */
            --secondary-color: #f50057; /* 较深的粉色 */
            --background-color: #f8f9fa; /* 浅灰色背景 */
            --text-color: #333; /* 深灰色文字 */
            --weak-text-color: #777; /* 浅灰色弱化文字 */
            --border-color: #e0e0e0; /* 浅灰色边框 */
            --card-background: #fff; /* 白色卡片背景 */
            --button-text-color: #fff; /* 按钮文字白色 */
            --container-max-width: 1200px;
            --spacing-unit: 1rem;
            --radius-small: 4px;
            --radius-medium: 8px;
            --radius-large: 12px;
            --shadow-small: 0 2px 4px rgba(0,0,0,.08);
            --shadow-medium: 0 4px 8px rgba(0,0,0,.1);
            --transition-speed: 0.3s;
        }

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

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

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

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

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

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

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

        /* Header and Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: var(--shadow-small);
            padding: var(--spacing-unit) 0;
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            margin-right: var(--spacing-unit);
        }

        .logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }

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

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

        .nav-links a {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-color);
            padding: calc(var(--spacing-unit) / 2) 0;
            position: relative;
            transition: color var(--transition-speed) ease-in-out;
        }

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

        .nav-links a.active::after,
        .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: -2px;
            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: #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: rgba(0, 0, 0, 0.5);
        }

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

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

        .hero p {
            font-size: 1.3rem;
            max-width: 700px;
            margin: 0 auto var(--spacing-unit);
            text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
        }

        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: var(--button-text-color);
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
            border-radius: var(--radius-large);
            font-size: 1.1rem;
            font-weight: 700;
            transition: background-color var(--transition-speed) ease-in-out, transform var(--transition-speed) ease-in-out, box-shadow var(--transition-speed) ease-in-out;
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

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

        .section-title {
            text-align: center;
            margin-bottom: calc(var(--spacing-unit) * 3);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-color);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: var(--weak-text-color);
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        /* Category Card */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

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

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

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

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

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

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

        .category-card .btn {
            margin-top: var(--spacing-unit);
            background-color: var(--secondary-color); /* Secondary button for category links */
            width: 100%;
            text-align: center;
            padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 1.5);
        }

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

        /* Feature Section */
        .feature-section {
            background-color: var(--card-background);
            border-radius: var(--radius-large);
            padding: calc(var(--spacing-unit) * 4);
            box-shadow: var(--shadow-small);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: calc(var(--spacing-unit) * 4);
            align-items: center;
        }

        .feature-image img {
            border-radius: var(--radius-large);
            box-shadow: var(--shadow-medium);
        }

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

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

        /* FAQ Section */
        .faq-section {
            background-color: var(--card-background);
            border-radius: var(--radius-large);
            padding: calc(var(--spacing-unit) * 4);
            box-shadow: var(--shadow-small);
        }

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

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

        .faq-question {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary-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;
            transition: transform var(--transition-speed) ease-in-out;
        }

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

        .faq-answer {
            font-size: 1.1rem;
            color: var(--weak-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-in-out, padding var(--transition-speed) ease-in-out;
            padding: 0 var(--spacing-unit);
        }

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

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

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

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

        .cta-section .btn {
            background-color: var(--card-background);
            color: var(--primary-color);
            font-size: 1.2rem;
            padding: var(--spacing-unit) calc(var(--spacing-unit) * 2.5);
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: #fff;
            padding: calc(var(--spacing-unit) * 4) 0;
            margin-top: calc(var(--spacing-unit) * 5);
        }

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

        .site-name {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
        }

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

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

        .footer-links a {
            color: #ccc;
            font-size: 1.1rem;
            transition: color var(--transition-speed) ease-in-out;
        }

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

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

        .copyright a {
            color: #ccc;
            text-decoration: underline;
        }

        .copyright a:hover {
            color: #fff;
        }

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .nav-links ul {
                justify-content: center;
                margin-top: var(--spacing-unit);
            }
            .nav-links li {
                margin: 0 calc(var(--spacing-unit) * 1);
            }
            .hero h1 {
                font-size: 2.8rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .feature-section {
                grid-template-columns: 1fr;
                gap: calc(var(--spacing-unit) * 3);
            }
            .feature-image img {
                margin-bottom: var(--spacing-unit);
            }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
            .logo { font-size: 1.5rem; }
            .nav-links { display: none; } /* Basic mobile menu toggle needed in real implementation */
            .hero { padding: calc(var(--spacing-unit) * 4) 0; }
            .hero h1 { font-size: 2.5rem; }
            .hero p { font-size: 1rem; }
            .section { padding: calc(var(--spacing-unit) * 4) 0; }
            .section-title { font-size: 1.8rem; margin-bottom: calc(var(--spacing-unit) * 2); }
            .category-grid { grid-template-columns: 1fr; }
            .feature-section { padding: calc(var(--spacing-unit) * 3); }
            .cta-section { padding: calc(var(--spacing-unit) * 4) 0; }
            .cta-section h2 { font-size: 2rem; }
            .cta-section p { font-size: 1.1rem; }
            .footer-links ul { flex-direction: column; }
            .footer-links li { margin: calc(var(--spacing-unit) / 2) 0; }
        }

/* roulang page: category2 */
body{font-family:"Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.7;color:#1f2937;background:#f7f9fc}
  header,footer{background:#0f172a;color:#fff} header a,footer a{color:inherit;text-decoration:none}
  main section{padding:64px 0} .container{max-width:1180px}
  .hero,.site-hero{background:linear-gradient(135deg,#0f172a,#1d4ed8);color:#fff}
  .card,.feature-card,.service-card,.category-card{border:1px solid rgba(15,23,42,.08);box-shadow:0 12px 32px rgba(15,23,42,.08);border-radius:16px}
  .btn,.button,a[class*="btn"]{border-radius:999px;font-weight:700}
  img{max-width:100%;height:auto} @media(max-width:768px){main section{padding:42px 0} h1{font-size:2rem}}

/* roulang page: category3 */
:root {
            --primary-color: #ff6b6b;
            --secondary-color: #f08080;
            --background-color: #fdfdfd;
            --text-color: #333;
            --muted-text-color: #777;
            --border-color: #eee;
            --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);
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
        }

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

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

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

        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, input, select, textarea {
            font-family: inherit;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            padding: var(--spacing-xs) var(--spacing-sm);
        }

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

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

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

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

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

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

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

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

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

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

        .hero {
            background-color: #fce8e8;
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: var(--spacing-lg) 0;
            position: relative;
            overflow: hidden;
        }

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

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

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

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

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

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

        main .container {
            padding-top: var(--spacing-lg);
            padding-bottom: var(--spacing-lg);
        }

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

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

        .content-block {
            margin-bottom: var(--spacing-lg);
            background-color: #fff;
            padding: var(--spacing-md);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
        }

        .content-block h2 {
            font-size: 2rem;
            margin-bottom: var(--spacing-sm);
            color: var(--primary-color);
        }

        .content-block p {
            margin-bottom: var(--spacing-sm);
        }

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

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

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

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

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

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

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

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

        .faq-section {
            background-color: #f9f9f9;
            padding: var(--spacing-lg) 0;
        }

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

        .faq-question {
            background-color: #fff;
            padding: var(--spacing-sm) var(--spacing-md);
            font-weight: bold;
            cursor: pointer;
            position: relative;
        }

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

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

        .faq-answer {
            padding: var(--spacing-sm) var(--spacing-md);
            background-color: #fdfdfd;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer p {
            margin-bottom: 0;
        }

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

        .contact-cta {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: var(--spacing-lg) 0;
        }

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

        .contact-cta p {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-lg);
        }

        footer {
            background-color: #333;
            color: #fff;
            padding: var(--spacing-lg) 0 var(--spacing-sm);
            text-align: center;
            margin-top: var(--spacing-lg);
        }

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

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

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

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

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

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

        .copyright a {
            color: #aaa;
            text-decoration: underline;
        }
        .copyright a:hover {
            color: #fff;
        }

        /* Mobile responsiveness */
        @media (max-width: 992px) {
            .nav-links {
                display: none; /* Basic desktop nav for now, mobile menu needs implementation if required */
            }
            .logo {
                font-size: 1.5rem;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
            footer .container {
                 padding: 0 var(--spacing-sm);
            }
            .footer-links li {
                margin: 0 var(--spacing-xs);
            }
        }

        @media (max-width: 768px) {
            .hero {
                padding: var(--spacing-lg) 0 var(--spacing-md);
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
                margin-bottom: var(--spacing-lg);
            }
            .content-block, .faq-section {
                padding: var(--spacing-md) 0;
            }
            .content-block {
                padding: var(--spacing-md);
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .contact-cta h2 {
                font-size: 2rem;
            }
            .contact-cta p {
                font-size: 1rem;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e91e63; /* 鲜艳粉色 */
            --secondary-color: #ff9800; /* 活力橙色 */
            --background-color: #f8f9fa; /* 浅灰背景 */
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #dee2e6;
            --card-background: #ffffff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --card-border-radius: 8px;
            --container-max-width: 1200px;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --transition-speed: 0.3s;
        }

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

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

        .container {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 1rem;
        }

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

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

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

        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 4px var(--shadow-color);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

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

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

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
            transition: color var(--transition-speed);
        }

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

        .nav-links a:hover, .nav-links a:focus {
            color: var(--primary-color);
            text-decoration: none;
        }
        .nav-links a:hover::after, .nav-links a:focus::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 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-2.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            padding: var(--spacing-lg) 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 70%, rgba(0, 0, 0, 0) 100%);
            z-index: 1;
        }

        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
            padding: 4rem 1rem;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-lg);
        }

        .hero .cta-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: 0.8rem 2rem;
            border-radius: 5px;
            font-weight: bold;
            font-size: 1.1rem;
            transition: background-color var(--transition-speed), transform var(--transition-speed);
            box-shadow: 0 4px 8px var(--shadow-color);
        }

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

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

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

        .section-subtitle {
            text-align: center;
            color: var(--light-text-color);
            font-size: 1.1rem;
            margin-bottom: var(--spacing-lg);
        }

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

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

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

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

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

        .card-title {
            font-size: 1.4rem;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }

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

        .card-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: 0.6rem 1.2rem;
            border-radius: 5px;
            font-weight: bold;
            text-align: center;
            transition: background-color var(--transition-speed), transform var(--transition-speed);
            margin-top: auto; /* Pushes button to the bottom */
        }

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

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

        .feature-item {
            padding: var(--spacing-md);
        }

        .feature-item .icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }

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

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

        .faq-section {
            background-color: #fff;
            padding: var(--spacing-lg) 0;
        }

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

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

        .faq-question::before {
            content: '+';
            position: absolute;
            left: 0;
            font-size: 1.5rem;
            line-height: 1;
        }

        .faq-answer {
            font-size: 1rem;
            color: var(--light-text-color);
            margin-top: 0.8rem;
            padding-left: 10px; /* Indent answer */
            display: none; /* Hidden by default */
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .faq-item.open .faq-question::before {
            content: '-';
        }

        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: var(--spacing-lg) 0;
        }

        .cta-section h2 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            color: #fff;
        }

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

        .cta-button-secondary {
            display: inline-block;
            background-color: var(--secondary-color);
            color: #fff;
            padding: 0.8rem 2rem;
            border-radius: 5px;
            font-weight: bold;
            font-size: 1.1rem;
            transition: background-color var(--transition-speed), transform var(--transition-speed);
        }

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

        footer {
            background-color: #333;
            color: #fff;
            padding: var(--spacing-lg) 0;
            text-align: center;
        }

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

        footer .site-name {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 1rem;
            color: var(--secondary-color);
        }

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

        .footer-links li {
            margin: 0 1rem;
        }

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

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

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

        .copyright a {
            color: #aaa;
            text-decoration: none;
        }

        .copyright a:hover, .copyright a:focus {
            color: #fff;
            text-decoration: underline;
        }

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .nav-links ul {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: 0 4px 8px var(--shadow-color);
                display: none; /* Hidden by default, shown via JS toggle */
            }

            .nav-links li {
                margin: 0;
                text-align: center;
                padding: 0.8rem 0;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links li:last-child {
                border-bottom: none;
            }

            .nav-links a {
                display: block;
                width: 100%;
                padding: 0;
            }
            .nav-links a::after {
                display: none;
            }

            /* Hamburger Menu Icon (add this structure if needed, but for simplicity, assuming no JS hamburger for now) */
            /* .menu-toggle { display: block; } */

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

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

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

        @media (max-width: 768px) {
            .logo {
                font-size: 1.5rem;
            }

            .hero h1 {
                font-size: 2rem;
            }
            .hero .hero-content {
                padding: 3rem 1rem;
            }

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

            .features-section .container {
                grid-template-columns: 1fr;
            }
            .footer-links ul {
                flex-direction: column;
            }
            .footer-links li {
                margin-bottom: 0.8rem;
            }
        }

        @media (max-width: 576px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero .cta-button {
                font-size: 1rem;
                padding: 0.7rem 1.5rem;
            }

            .section {
                padding: 2rem 0;
            }
            .section h2 {
                font-size: 1.8rem;
            }

            .content-cards {
                grid-template-columns: 1fr;
            }
            .card img {
                height: 180px;
            }
            .card-content {
                padding: 1rem;
            }
            .card-title {
                font-size: 1.2rem;
            }
            .card-description {
                font-size: 0.9rem;
            }
            .card-button {
                padding: 0.5rem 1rem;
                font-size: 0.9rem;
            }

            .cta-section h2 {
                font-size: 2rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
            .cta-button-secondary {
                font-size: 1rem;
                padding: 0.7rem 1.5rem;
            }
            footer .site-name {
                font-size: 1.5rem;
            }
        }

/* roulang page: category5 */
:root {
            --primary-color: #e91e63; /* 鲜活的粉色/红色 */
            --secondary-color: #ffc107; /* 亮黄色/金色 */
            --accent-color: #9c27b0; /* 紫色 */
            --background-color: #f8f8f8; /* 浅灰色背景 */
            --text-color: #333; /* 深灰色文字 */
            --light-text-color: #777; /* 浅灰色文字 */
            --border-color: #eee; /* 浅灰色边框 */
            --card-background: #fff; /* 白色卡片背景 */
            --container-width: 1200px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
            --spacing-xl: 48px;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition-speed: 0.3s;
        }

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

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.7;
        }

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

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

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

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

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

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: 1rem;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            padding: var(--spacing-sm) var(--spacing-md);
            transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
        }

        button {
            cursor: pointer;
            background-color: var(--primary-color);
            color: white;
            border: none;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        button:hover, button:focus {
            background-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(156, 39, 176, 0.3);
            outline: none;
        }

        /* Header */
        header {
            background-color: var(--card-background);
            padding: var(--spacing-sm) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        }

        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(--accent-color);
        }

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

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

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

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

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

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

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: var(--spacing-xl) 0;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 500px;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.8));
        }

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

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

        .hero p {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-lg);
            text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
        }

        .hero .cta-button {
            background-color: var(--secondary-color);
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-xl);
            font-size: 1.1rem;
            font-weight: bold;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
        }

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

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

        .section h2 {
            text-align: center;
            margin-bottom: var(--spacing-lg);
            font-size: 2.2rem;
        }

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

        .content-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;
        }

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

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

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

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

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

        .content-card-body .learn-more {
            display: inline-block;
            margin-top: var(--spacing-sm);
            font-weight: bold;
            color: var(--accent-color);
        }

        /* Feature Section */
        .feature-section {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            padding: var(--spacing-xl);
            box-shadow: var(--box-shadow);
        }

        .feature-section ul {
            list-style: none;
            padding-left: 0;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

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

        .feature-item i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: var(--spacing-sm);
        }
        .feature-item h4 {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-xs);
        }
        .feature-item p {
            font-size: 0.9rem;
            color: var(--light-text-color);
        }

        /* FAQ Section */
        .faq-section {
            padding: var(--spacing-xl) 0;
            background-color: var(--card-background);
        }
        .faq-section .container {
            max-width: 800px; /* Narrower for FAQ readability */
        }

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

        .faq-question {
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            padding-right: var(--spacing-lg);
        }

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

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

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

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

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

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

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

        .cta-section .cta-button {
            background-color: var(--secondary-color);
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-xl);
            font-size: 1.1rem;
            font-weight: bold;
            border-radius: var(--border-radius);
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: #ccc;
            padding: var(--spacing-lg) 0 var(--spacing-sm);
            margin-top: var(--spacing-xl);
            text-align: center;
        }

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

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

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

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

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

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

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

        .copyright a {
            color: #aaa;
            text-decoration: underline;
        }
        .copyright a:hover {
            color: white;
        }

        /* Responsive Adjustments */
        @media (max-width: 1024px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .hero h1 { font-size: 3rem; }
            .hero p { font-size: 1rem; }
            .feature-section ul { grid-template-columns: repeat(2, 1fr); }
            .nav-links li { margin-left: var(--spacing-md); }
            .logo { font-size: 1.5rem; }
        }

        @media (max-width: 768px) {
            nav { flex-wrap: wrap; }
            .nav-links {
                width: 100%;
                order: 3;
                margin-top: var(--spacing-sm);
                display: none; /* Placeholder for mobile menu */
            }
            .nav-links ul {
                flex-direction: column;
                align-items: center;
            }
            .nav-links li { margin: var(--spacing-xs) 0; }
            .hero { min-height: 400px; padding: var(--spacing-lg) 0; }
            .hero h1 { font-size: 2.5rem; }
            .content-block { grid-template-columns: 1fr; }
            .feature-section ul { grid-template-columns: 1fr; }
            .footer-links ul { flex-direction: column; }
            .footer-links li { margin: var(--spacing-xs) 0; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 var(--spacing-sm); }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 0.9rem; }
            .hero .cta-button { padding: var(--spacing-sm) var(--spacing-lg); }
            .section h2 { font-size: 1.8rem; }
            .content-card-body { padding: var(--spacing-sm); }
            .content-card-body h3 { font-size: 1.2rem; }
            .faq-question { font-size: 1.1rem; }
        }