/* roulang page: index */
:root {
            --primary-color: #e91e63; /* 品牌主色调，如深粉红 */
            --secondary-color: #f06292; /* 品牌辅助色，如浅粉红 */
            --accent-color: #ffcdd2; /* 点缀色，如淡粉 */
            --background-color: #fffafb; /* 页面背景色，如极浅粉 */
            --text-color: #333; /* 主要文字颜色 */
            --subtle-text-color: #777; /* 次要文字颜色 */
            --border-color: #eee; /* 边框颜色 */
            --card-background: #ffffff; /* 卡片背景色 */
            --shadow-color: rgba(0, 0, 0, 0.05); /* 阴影颜色 */
            --container-max-width: 1200px;
            --spacing-unit: 16px;
            --container-padding: var(--spacing-unit);
            --border-radius: 8px;
            --transition-speed: 0.3s;
        }

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

        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 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: color var(--transition-speed) ease;
        }

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

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

        .container {
            width: 100%;
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding: 0 var(--container-padding);
        }

        /* 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;
        }

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

        .logo {
            font-size: 28px;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
        }
        .logo span {
            font-weight: normal;
            font-size: 18px;
            color: var(--subtle-text-color);
        }

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

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

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: 10px 0;
            position: relative;
            transition: color var(--transition-speed) ease;
        }

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

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

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

        /* Mobile Nav (Hamburger Menu) */
        .menu-toggle {
            display: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--text-color);
        }

        /* Hero Section */
        .hero {
            background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: var(--spacing-unit) * 6 0;
            position: relative;
            overflow: hidden;
            border-radius: var(--border-radius) * 2;
            margin-top: var(--spacing-unit);
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: inherit;
            filter: blur(5px);
            transform: scale(1.05);
            z-index: -1;
        }

        .hero h1 {
            font-size: 3.5em;
            margin-bottom: var(--spacing-unit) * 2;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.3em;
            margin-bottom: var(--spacing-unit) * 4;
            color: rgba(255, 255, 255, 0.9);
        }

        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: #fff;
            padding: var(--spacing-unit) * 1.5 var(--spacing-unit) * 3;
            border-radius: var(--border-radius);
            font-size: 1.1em;
            font-weight: bold;
            text-decoration: none;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px var(--shadow-color);
        }

        .btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px var(--shadow-color);
        }

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

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

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

        /* Feature Cards */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-unit) * 3;
        }

        .feature-card {
            background-color: var(--card-background);
            border-radius: var(--border-radius) * 1.5;
            overflow: hidden;
            box-shadow: 0 4px 15px var(--shadow-color);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            display: flex;
            flex-direction: column;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

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

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

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

        .feature-card-description {
            color: var(--subtle-text-color);
            margin-bottom: var(--spacing-unit) * 2;
            flex-grow: 1;
        }

        .feature-card-link {
            color: var(--primary-color);
            font-weight: bold;
            text-align: right;
            margin-top: auto; /* Push to bottom */
        }

        /* Latest Posts / News Section */
        .latest-posts {
            background-color: #ffffff; /* White background for content */
            padding: var(--spacing-unit) * 5 0;
            border-radius: var(--border-radius) * 2;
        }

        .post-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: var(--spacing-unit) * 3;
        }

        .post-item {
            background-color: var(--card-background);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 2px 8px var(--shadow-color);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
            display: flex;
            flex-direction: column;
        }

        .post-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }

        .post-item-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }

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

        .post-item-title {
            font-size: 1.3em;
            font-weight: bold;
            margin-bottom: var(--spacing-unit);
            color: var(--primary-color);
            display: block;
            text-decoration: none;
        }
        .post-item-title:hover {
            text-decoration: underline;
        }

        .post-item-meta {
            font-size: 0.9em;
            color: var(--subtle-text-color);
            margin-bottom: var(--spacing-unit);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .post-item-excerpt {
            color: var(--subtle-text-color);
            font-size: 0.95em;
            margin-bottom: var(--spacing-unit) * 2;
            flex-grow: 1;
        }
        
        .post-item-readmore {
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
            display: inline-block;
            margin-top: auto;
            align-self: flex-start;
        }
        .post-item-readmore:hover {
            text-decoration: underline;
        }

        /* FAQ Section */
        .faq-section {
            background-color: var(--accent-color); /* Lighter accent for variety */
            padding: var(--spacing-unit) * 5 0;
            border-radius: var(--border-radius) * 2;
        }

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

        .faq-question {
            padding: var(--spacing-unit) * 1.5 var(--spacing-unit) * 2;
            font-size: 1.2em;
            font-weight: bold;
            cursor: pointer;
            position: relative;
            color: var(--primary-color);
            transition: background-color var(--transition-speed) ease;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

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

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

        .faq-answer {
            padding: 0 var(--spacing-unit) * 2;
            font-size: 1em;
            color: var(--subtle-text-color);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
        }

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

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: var(--spacing-unit) * 6 0;
            border-radius: var(--border-radius) * 2;
            margin-top: var(--spacing-unit) * 4;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
            animation: ripple 5s infinite linear;
        }

        @keyframes ripple {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .cta-section h2 {
            font-size: 2.8em;
            margin-bottom: var(--spacing-unit) * 2;
            line-height: 1.2;
        }

        .cta-section p {
            font-size: 1.2em;
            margin-bottom: var(--spacing-unit) * 4;
            color: rgba(255, 255, 255, 0.9);
        }

        .cta-section .btn {
            background-color: #fff;
            color: var(--primary-color);
            font-size: 1.2em;
            padding: var(--spacing-unit) * 1.5 var(--spacing-unit) * 3.5;
        }
        .cta-section .btn:hover {
            background-color: var(--secondary-color);
            color: #fff;
        }

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

        .footer-logo {
            font-size: 24px;
            font-weight: bold;
            color: #fff;
            margin-bottom: var(--spacing-unit) * 2;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: var(--spacing-unit) * 3;
        }

        .footer-links a {
            color: #ccc;
            margin: 0 var(--spacing-unit) * 1.5;
            transition: color var(--transition-speed) ease;
        }

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

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

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 3em;
            }
            .section-title {
                font-size: 2em;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none; /* Hide desktop nav */
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: 0 4px 10px var(--shadow-color);
                padding: var(--spacing-unit) * 2;
            }

            .nav-links.active {
                display: flex; /* Show mobile nav when active */
            }

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

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

            .hero h1 {
                font-size: 2.5em;
            }
            .hero p {
                font-size: 1.1em;
            }
            .features-grid, .post-list {
                grid-template-columns: 1fr;
            }
            .section {
                padding: var(--spacing-unit) * 3 0;
            }
            .cta-section h2 {
                font-size: 2.2em;
            }
            .cta-section p {
                font-size: 1.1em;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 24px;
            }
            .logo span {
                font-size: 16px;
            }
            .hero {
                padding: var(--spacing-unit) * 4 0;
            }
            .hero h1 {
                font-size: 2em;
            }
            .btn {
                padding: var(--spacing-unit) * 1.2 var(--spacing-unit) * 2;
                font-size: 1em;
            }
            .section-title {
                font-size: 1.8em;
                margin-bottom: var(--spacing-unit) * 3;
            }
            .section-subtitle {
                font-size: 1.1em;
                margin-bottom: var(--spacing-unit) * 3;
            }
            .feature-card-title, .post-item-title {
                font-size: 1.2em;
            }
            .footer-links a {
                margin: 0 var(--spacing-unit) * 0.8;
            }
        }

/* roulang page: article */
:root {
            --primary-color: #f06292; /* 柔和粉色 */
            --secondary-color: #ce93d8; /* 淡紫色 */
            --background-color: #f8f3f7; /* 淡奶油色 */
            --text-color: #333;
            --muted-text-color: #777;
            --border-color: #e1bee7; /* 淡紫边框 */
            --card-background: #ffffff;
            --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --container-width: 1200px;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --transition-speed: 0.3s;
        }

        body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--background-color);
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

        /* Header & Nav */
        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            padding: var(--spacing-unit) 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo {
            font-size: 2em;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
        }

        .logo span {
            font-size: 0.6em;
            font-weight: normal;
            margin-left: 5px;
            color: var(--muted-text-color);
        }

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

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

        .nav-links a {
            text-decoration: none;
            color: var(--muted-text-color);
            font-weight: 500;
            padding: 8px 0;
            transition: color var(--transition-speed) ease;
            position: relative;
        }

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

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

        .menu-toggle {
            display: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--primary-color);
        }

        /* Main Content Area */
        main {
            flex-grow: 1;
            padding: calc(var(--spacing-unit) * 3) 0;
        }

        .article-title {
            font-size: 2.8em;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: var(--spacing-unit);
            text-align: center;
        }

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

        .article-content {
            background-color: var(--card-background);
            padding: calc(var(--spacing-unit) * 3);
            border-radius: var(--border-radius);
            box-shadow: var(--card-shadow);
            max-width: 800px;
            margin: 0 auto;
        }

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

        .article-content p {
            margin-bottom: var(--spacing-unit);
            text-indent: 2em;
        }

        .article-content img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: var(--spacing-unit) auto;
            border-radius: var(--border-radius);
            box-shadow: var(--card-shadow);
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary-color);
            padding-left: var(--spacing-unit);
            margin-left: 0;
            font-style: italic;
            color: var(--muted-text-color);
        }

        .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);
        }

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

        .no-content a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: bold;
            transition: color var(--transition-speed) ease;
        }

        .no-content a:hover {
            color: var(--secondary-color);
        }

        /* CTA Button */
        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5);
            text-decoration: none;
            border-radius: var(--border-radius);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
            box-shadow: 0 4px 10px rgba(240, 98, 146, 0.4);
            margin-top: var(--spacing-unit);
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(206, 147, 216, 0.4);
        }
        
        /* Footer */
        footer {
            background-color: #e8d7ec; /* 淡紫背景 */
            color: var(--text-color);
            padding: calc(var(--spacing-unit) * 2) 0;
            margin-top: auto; /* Push footer to bottom */
            text-align: center;
        }

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

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

        .footer-links {
            margin-bottom: var(--spacing-unit);
        }

        .footer-links a {
            color: var(--text-color);
            text-decoration: none;
            margin: 0 var(--spacing-unit);
            transition: color var(--transition-speed) ease;
        }

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

        .footer-copyright {
            font-size: 0.9em;
            color: var(--muted-text-color);
        }

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

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

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

            .menu-toggle {
                display: block;
            }

            .article-title {
                font-size: 2em;
            }

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

/* roulang page: category1 */
:root {
            --primary-color: #007bff; /* Blue */
            --secondary-color: #6c757d; /* Gray */
            --accent-color: #ffc107; /* Yellow */
            --background-color: #f8f9fa; /* Light Gray */
            --text-color: #212529; /* Dark Gray */
            --light-text-color: #6c757d;
            --border-color: #dee2e6;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --spacing-unit: 16px;
            --container-max-width: 1200px;
            --header-height: 70px;
            --footer-height: 100px;
        }

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

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

        h1, h2, h3, h4, h5, h6 {
            margin-top: 0;
            margin-bottom: var(--spacing-unit);
            font-weight: 600;
            line-height: 1.4;
        }

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

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

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

        a:hover {
            color: #0056b3;
            text-decoration: underline;
        }

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

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

        /* Header */
        header {
            background-color: #fff;
            box-shadow: var(--shadow);
            height: var(--header-height);
            display: flex;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        header nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-color);
        }
        .logo span {
            font-size: 0.8rem;
            color: var(--light-text-color);
            margin-left: 5px;
        }

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

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

        .nav-links a {
            color: var(--text-color);
            font-weight: 500;
            padding: 10px 15px;
            border-radius: var(--border-radius);
            transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
        }

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

        .nav-links a:not(.active):hover {
            background-color: #e9ecef;
            color: var(--primary-color);
        }

        .menu-toggle {
            display: none;
            font-size: 2rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: 100px var(--spacing-unit);
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }

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

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

        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: 15px 30px;
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: 600;
            transition: background-color 0.2s ease-in-out, transform 0.2s ease-in-out;
            box-shadow: var(--shadow);
        }

        .cta-button:hover {
            background-color: #e0a800;
            text-decoration: none;
            transform: translateY(-3px);
        }

        /* Section Styles */
        section {
            padding: 80px 0;
        }

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

        .section-subtitle {
            text-align: center;
            color: var(--light-text-color);
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto var(--spacing-unit);
        }

        /* Service Section */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: calc(var(--spacing-unit) * 2);
        }

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

        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        .service-card img {
            margin: 0 auto var(--spacing-unit);
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-unit);
        }

        .service-card h3 {
            font-size: 1.4rem;
            margin-bottom: calc(var(--spacing-unit) / 2);
            color: var(--primary-color);
        }

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

        /* Process Section */
        .process-list {
            list-style: none;
            padding: 0;
            counter-reset: process-counter;
            position: relative;
        }

        .process-list li {
            position: relative;
            padding-left: 50px;
            margin-bottom: calc(var(--spacing-unit) * 3);
        }

        .process-list li::before {
            counter-increment: process-counter;
            content: counter(process-counter);
            position: absolute;
            left: 0;
            top: 0;
            width: 40px;
            height: 40px;
            background-color: var(--primary-color);
            color: #fff;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.2rem;
            font-weight: bold;
            box-shadow: var(--shadow);
        }

        .process-list h4 {
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: calc(var(--spacing-unit) / 2);
        }

        .process-list p {
            font-size: 1rem;
            color: var(--light-text-color);
        }

        /* FAQ Section */
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-unit);
        }

        .faq-question {
            background-color: #fff;
            padding: var(--spacing-unit) * 1.5;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.1rem;
            position: relative;
            border-radius: var(--border-radius);
        }

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

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

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

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

        /* CTA Section */
        .cta-section {
            background-color: var(--primary-color);
            color: #fff;
            text-align: center;
            padding: 60px var(--spacing-unit);
        }

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

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

        .cta-section .cta-button {
            background-color: var(--accent-color);
            color: var(--text-color);
        }

        .cta-section .cta-button:hover {
            background-color: #e0a800;
        }

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

        .footer-logo {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: var(--spacing-unit);
        }

        .footer-links {
            margin-bottom: var(--spacing-unit);
        }

        .footer-links a {
            color: #fff;
            margin: 0 var(--spacing-unit);
            opacity: 0.9;
            transition: opacity 0.2s ease-in-out;
        }

        .footer-links a:hover {
            opacity: 1;
            text-decoration: underline;
        }

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

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background-color: #fff;
                padding: var(--spacing-unit);
                box-shadow: var(--shadow);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                margin: 10px 0;
            }
            .menu-toggle {
                display: block;
            }

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

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .service-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .hero {
                padding: 60px var(--spacing-unit);
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .faq-question {
                font-size: 1rem;
            }
            .footer-links a {
                margin: 0 var(--spacing-unit)/2;
            }
        }

/* roulang page: category2 */
:root {
            --primary-color: #e0b0ff; /* 柔和的紫色调 */
            --secondary-color: #f8f0e3; /* 温暖的米色调 */
            --accent-color: #c8a2c8; /* 略深的紫色 */
            --text-color: #333;
            --light-text-color: #666;
            --background-color: #ffffff;
            --border-color: #eee;
            --card-bg: #fff;
            --container-max-width: 1200px;
            --header-height: 80px;
            --footer-height: 100px;
            --spacing-small: 8px;
            --spacing-medium: 16px;
            --spacing-large: 24px;
            --spacing-xlarge: 32px;
            --border-radius: 8px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.12);
            --font-primary: 'Helvetica Neue', Arial, sans-serif;
            --font-secondary: 'Georgia', serif;
        }

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

        body {
            font-family: var(--font-primary);
            color: var(--text-color);
            background-color: var(--background-color);
            line-height: 1.6;
            scroll-behavior: smooth;
        }

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

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

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

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

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

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

        .btn {
            display: inline-block;
            padding: var(--spacing-medium) var(--spacing-large);
            background-color: var(--primary-color);
            color: #fff;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            text-align: center;
        }

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

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

        .btn.btn-secondary:hover {
            background-color: #e0d8c9;
        }

        /* Header & Navigation */
        header {
            background-color: var(--background-color);
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        header nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo {
            font-family: var(--font-secondary);
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--text-color);
        }
        .logo span {
            font-size: 0.8rem;
            color: var(--light-text-color);
            margin-left: var(--spacing-small);
        }

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

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

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

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

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

        .menu-toggle {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            padding: var(--spacing-xlarge) 0;
            height: 60vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            z-index: 1;
        }

        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 0 var(--spacing-medium);
        }

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

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

        /* Section Styling */
        .section {
            padding: var(--spacing-xlarge) 0;
            text-align: center;
        }

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

        .section p {
            font-size: 1.1rem;
            color: var(--light-text-color);
            max-width: 800px;
            margin: 0 auto var(--spacing-large);
        }

        /* Exclusive Services Section */
        .exclusive-services .service-item {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-card);
            padding: var(--spacing-large);
            margin-bottom: var(--spacing-large);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: left;
            display: flex;
            align-items: center;
            gap: var(--spacing-large);
        }

        .exclusive-services .service-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .exclusive-services .service-item img {
            flex-shrink: 0;
            width: 120px;
            height: 120px;
            object-fit: cover;
            border-radius: var(--border-radius);
        }

        .exclusive-services .service-item h3 {
            font-size: 1.5rem;
            margin-bottom: var(--spacing-small);
            color: var(--text-color);
        }

        .exclusive-services .service-item p {
            color: var(--light-text-color);
            font-size: 1rem;
            margin-bottom: 0;
        }

        /* Process Section */
        .process-section .process-steps {
            display: flex;
            justify-content: space-around;
            gap: var(--spacing-large);
            flex-wrap: wrap;
        }

        .process-section .step {
            flex: 1;
            min-width: 200px;
            text-align: center;
        }

        .process-section .step-icon {
            background-color: var(--primary-color);
            color: #fff;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8rem;
            font-weight: bold;
            margin: 0 auto var(--spacing-medium);
        }

        .process-section .step h4 {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-small);
        }

        .process-section .step p {
            font-size: 0.95rem;
            color: var(--light-text-color);
        }

        /* FAQ Section */
        .faq-section .faq-item {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-card);
            margin-bottom: var(--spacing-medium);
            transition: box-shadow 0.3s ease;
        }

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

        .faq-section .faq-question {
            padding: var(--spacing-medium);
            cursor: pointer;
            font-weight: bold;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #f9f9f9;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
        }

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

        .faq-section .faq-answer {
            padding: var(--spacing-medium);
            color: var(--light-text-color);
            display: none; /* Hidden by default */
            border-top: 1px solid var(--border-color);
        }

        .faq-section .faq-item.open .faq-question::after {
            content: '-';
            transform: rotate(0deg);
        }

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

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

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

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

        .cta-section .btn {
            background-color: #fff;
            color: var(--primary-color);
            font-size: 1.1rem;
            padding: var(--spacing-medium) var(--spacing-xlarge);
        }

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

        /* Footer */
        footer {
            background-color: #333;
            color: #fff;
            padding: var(--spacing-large) 0 var(--spacing-medium);
            text-align: center;
        }

        footer .footer-logo {
            font-family: var(--font-secondary);
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: var(--spacing-medium);
        }

        footer .footer-links {
            margin-bottom: var(--spacing-large);
        }

        footer .footer-links a {
            color: #bbb;
            margin: 0 var(--spacing-medium);
            transition: color 0.3s ease;
        }

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

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

        /* Responsive Design */
        @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; }
            .section h2 { font-size: 2rem; }
            .cta-section h2 { font-size: 2.2rem; }

            .exclusive-services .service-item {
                flex-direction: column;
                text-align: center;
            }
            .exclusive-services .service-item img {
                width: 100px;
                height: 100px;
                margin-bottom: var(--spacing-medium);
            }

            .process-section .process-steps {
                flex-direction: column;
                align-items: center;
            }
            .process-section .step {
                max-width: 350px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background-color: var(--background-color);
                box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
                padding: var(--spacing-medium) 0;
            }

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

            .nav-links li {
                margin: 0;
                text-align: center;
            }
            .nav-links a {
                display: block;
                padding: var(--spacing-medium);
            }
            .nav-links a.active::after {
                display: none;
            }

            .menu-toggle {
                display: block;
            }

            .hero {
                height: 50vh;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
        }

        @media (max-width: 576px) {
             h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .hero h1 { font-size: 2.2rem; }
            .section h2 { font-size: 1.8rem; }
            .cta-section h2 { font-size: 2rem; }

            .btn {
                padding: var(--spacing-small) var(--spacing-medium);
                font-size: 0.9rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary-color: #e2407a;
            --secondary-color: #f08080;
            --accent-color: #ffb6c1;
            --background-color: #fdf5f5;
            --text-color: #333;
            --text-muted: #666;
            --border-color: #eee;
            --card-background: #fff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 16px;
            --spacing-xs: 8px;
            --spacing-sm: 12px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
        }

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

        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', 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-md);
        }

        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;
        }

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

        .section-title {
            text-align: center;
            font-size: 2.2em;
            margin-bottom: var(--spacing-lg);
            color: var(--primary-color);
        }

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

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

        header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-sm) var(--spacing-md);
        }

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

        .logo span {
            font-weight: normal;
            font-size: 0.7em;
            color: var(--text-muted);
        }

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

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

        .nav-links a {
            font-size: 1.1em;
            color: var(--text-color);
            padding: var(--spacing-sm) 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

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

        .menu-toggle {
            display: none;
            font-size: 1.8em;
            cursor: pointer;
            color: var(--primary-color);
        }

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

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

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

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

        .hero-subtitle {
            font-size: 1.5em;
            margin-bottom: var(--spacing-lg);
        }

        .cta-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: #fff;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-md);
            font-size: 1.2em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: 0 4px 8px var(--shadow-color);
        }

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

        /* Feature Section */
        .features-section .container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

        .feature-card {
            background-color: var(--card-background);
            padding: var(--spacing-md);
            border-radius: var(--radius-lg);
            box-shadow: 0 4px 8px var(--shadow-color);
            text-align: center;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

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

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

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

        /* Process Section */
        .process-section .container {
            position: relative;
        }

        .process-timeline {
            position: relative;
            display: flex;
            justify-content: space-around;
            padding: var(--spacing-lg) 0;
        }

        .process-timeline::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--border-color);
            transform: translateY(-50%);
        }

        .process-step {
            text-align: center;
            width: 25%;
            position: relative;
            z-index: 1;
        }

        .process-step-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #fff;
            font-size: 1.3em;
            font-weight: bold;
            margin: 0 auto var(--spacing-sm);
        }

        .process-step-title {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: var(--spacing-sm);
        }

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

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

        .faq-item {
            background-color: var(--card-background);
            border-radius: var(--radius-lg);
            margin-bottom: var(--spacing-md);
            box-shadow: 0 2px 4px var(--shadow-color);
        }

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

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

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 var(--spacing-md);
            color: var(--text-muted);
            font-size: 0.95em;
        }

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

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

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, var(--secondary-color) 0%, var(--primary-color) 70%);
            opacity: 0.5;
            z-index: 0;
        }

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

        .cta-title {
            font-size: 2.5em;
            margin-bottom: var(--spacing-md);
        }

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

        .cta-button-secondary {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--text-color);
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-md);
            font-size: 1.2em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            box-shadow: 0 4px 8px var(--shadow-color);
        }

        .cta-button-secondary:hover {
            background-color: #fff;
            color: var(--primary-color);
            transform: translateY(-2px);
        }

        /* Footer */
        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-logo {
            font-size: 1.8em;
            font-weight: bold;
            margin-bottom: var(--spacing-sm);
            color: var(--accent-color);
        }

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

        .footer-links a {
            color: #fff;
            margin: 0 var(--spacing-sm);
            transition: color 0.3s ease;
        }

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

        .footer-copyright {
            font-size: 0.9em;
            color: var(--text-muted);
        }

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

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

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

            .menu-toggle {
                display: block;
            }

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

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

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

            .process-timeline {
                flex-direction: column;
                align-items: center;
            }

            .process-timeline::before {
                display: none;
            }

            .process-step {
                width: 100%;
                margin-bottom: var(--spacing-lg);
            }

            .process-step:last-child {
                margin-bottom: 0;
            }
            
            .cta-title {
                font-size: 2em;
            }
        }

/* roulang page: category4 */
:root {
            --primary-color: #e74c3c;
            --secondary-color: #3498db;
            --accent-color: #f39c12;
            --background-color: #f4f7f6;
            --text-color: #333;
            --light-text-color: #666;
            --border-color: #ddd;
            --card-background: #fff;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 32px;
        }

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

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

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

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

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

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

        /* Header & Navigation */
        header {
            background-color: var(--card-background);
            box-shadow: 0 2px 8px var(--shadow-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .logo span {
            color: var(--primary-color);
            font-size: 0.8em;
            margin-left: 5px;
        }

        .nav-links {
            list-style: none;
            display: flex;
            gap: var(--spacing-lg);
        }

        .nav-links li a {
            color: var(--light-text-color);
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: color 0.3s ease;
        }

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

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

        .menu-toggle {
            display: none;
            font-size: 2em;
            cursor: pointer;
            color: var(--text-color);
        }

        /* Hero Section */
        .hero {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: var(--spacing-lg) 0;
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-height: 500px;
        }

        .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: 2;
        }

        .hero h1 {
            font-size: 3em;
            margin-bottom: var(--spacing-sm);
            line-height: 1.2;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.6);
        }

        .hero p {
            font-size: 1.4em;
            margin-bottom: var(--spacing-md);
            text-shadow: 1px 1px 4px rgba(0,0,0,0.6);
        }

        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--radius-md);
            font-size: 1.1em;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
            border: none;
            cursor: pointer;
        }

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

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

        .section-title {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: var(--spacing-lg);
            color: var(--text-color);
        }

        .section-title span {
            color: var(--primary-color);
            font-weight: bold;
        }

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

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

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

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

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

        .specialty-card-title {
            font-size: 1.6em;
            margin-bottom: var(--spacing-sm);
            color: var(--primary-color);
        }

        .specialty-card p {
            font-size: 1em;
            color: var(--light-text-color);
        }

        /* Process Section */
        .process-section {
            background-color: var(--card-background);
            padding: var(--spacing-lg) 0;
            border-radius: var(--radius-lg);
        }

        .process-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-lg);
            text-align: center;
        }

        .process-item {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .process-item .icon {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8em;
            font-weight: bold;
            margin-bottom: var(--spacing-sm);
            box-shadow: 0 0 0 8px rgba(231, 76, 60, 0.2);
        }

        .process-item h3 {
            font-size: 1.4em;
            margin-bottom: var(--spacing-xs);
            color: var(--text-color);
        }

        .process-item p {
            color: var(--light-text-color);
        }

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

        .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: 1.2em;
            font-weight: bold;
            color: var(--text-color);
            cursor: pointer;
            position: relative;
            padding-right: 30px;
        }

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

        .faq-item.open .faq-question::after {
            content: '-';
            transform: rotate(0deg);
        }

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

        .faq-item.open .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-lg) 0;
            border-radius: var(--radius-lg);
        }

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

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

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

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

        .footer-links {
            margin-bottom: var(--spacing-md);
            display: flex;
            justify-content: center;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .footer-links a {
            color: white;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .footer-links a:hover {
            opacity: 1;
        }

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

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--card-background);
                box-shadow: 0 8px 16px var(--shadow-color);
                padding: var(--spacing-md) 0;
                gap: 0;
            }

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

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

            .menu-toggle {
                display: block;
            }

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

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

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

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

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

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

            .footer-links {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 2em;
            }

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

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