/* roulang page: index */
:root {
            /* Color Palette */
            --primary: #6C5CE7;
            --primary-dark: #5B4BD4;
            --secondary: #00CEC9;
            --secondary-dark: #00B5B2;
            --accent: #FF9F43;
            --accent-dark: #E88E2A;
            --bg-light: #FFFFFF;
            --bg-light-secondary: #F8F9FA;
            --bg-dark: #2D3436;
            --text-primary: #2D3436;
            --text-secondary: #636E72;
            --text-light: #FFFFFF;
            --border-color: #DFE6E9;
            /* Spacing & Size */
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1.5rem;
            --shadow-sm: 0 0.125rem 0.25rem rgba(108, 92, 231, 0.05);
            --shadow-md: 0 0.5rem 1rem rgba(108, 92, 231, 0.08);
            --shadow-lg: 0 1rem 2rem rgba(108, 92, 231, 0.12);
            --space-unit: 0.5rem;
            --section-padding-y: 5rem;
            --container-max-width: 1140px;
            /* Typography */
            --font-family-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            --font-family-cn: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family-cn), var(--font-family-sans);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.2;
            margin-bottom: calc(var(--space-unit) * 3);
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
        }

        h2 {
            font-size: 2rem;
        }

        h3 {
            font-size: 1.5rem;
        }

        p {
            margin-bottom: calc(var(--space-unit) * 2);
            color: var(--text-secondary);
        }

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

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

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

        section {
            padding: var(--section-padding-y) 0;
        }

        .container-custom {
            max-width: var(--container-max-width);
            margin: 0 auto;
            padding-left: calc(var(--space-unit) * 3);
            padding-right: calc(var(--space-unit) * 3);
        }

        /* Custom Utilities */
        .text-accent {
            color: var(--accent);
        }

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

        .bg-dark {
            background-color: var(--bg-dark);
            color: var(--text-light);
        }

        .bg-dark p,
        .bg-dark h1,
        .bg-dark h2,
        .bg-dark h3 {
            color: var(--text-light);
        }

        /* Buttons */
        .btn {
            display: inline-block;
            padding: calc(var(--space-unit) * 2) calc(var(--space-unit) * 4);
            border-radius: var(--radius-sm);
            font-weight: 600;
            text-align: center;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            text-decoration: none;
        }

        .btn:hover {
            transform: translateY(-2px);
            text-decoration: none;
        }

        .btn:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .btn-primary {
            background-color: var(--primary);
            color: white;
            box-shadow: var(--shadow-md);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: var(--shadow-lg);
            color: white;
        }

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

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

        .btn-outline-light {
            border-color: rgba(255, 255, 255, 0.3);
            color: white;
        }

        .btn-outline-light:hover {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: white;
        }

        /* Tag / Badge */
        .badge {
            display: inline-block;
            padding: calc(var(--space-unit) * 0.75) calc(var(--space-unit) * 2);
            font-size: 0.875rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            background-color: var(--secondary);
            color: white;
        }

        /* Cards */
        .card {
            border: none;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            background-color: var(--bg-light);
            height: 100%;
        }

        .card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }

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

        .card-body {
            padding: calc(var(--space-unit) * 3);
        }

        /* Custom Header / Navigation - Split Screen Style */
        .site-header {
            position: relative;
            z-index: 1000;
        }

        .nav-split-container {
            display: flex;
            min-height: 100vh;
            position: relative;
        }

        .nav-text-side {
            flex: 0 0 40%;
            background-color: var(--bg-light);
            display: flex;
            flex-direction: column;
            padding: calc(var(--space-unit) * 5) calc(var(--space-unit) * 5) calc(var(--space-unit) * 5) calc(var(--space-unit) * 5);
            position: relative;
            z-index: 2;
        }

        .nav-visual-side {
            flex: 0 0 60%;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center center;
            position: fixed;
            top: 0;
            right: 0;
            width: 60%;
            height: 100vh;
            z-index: 1;
        }

        /* Logo & Navigation */
        .navbar-brand {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: calc(var(--space-unit) * 6);
            display: inline-block;
        }

        .navbar-brand span {
            color: var(--accent);
        }

        .nav-main {
            display: flex;
            flex-direction: column;
            gap: calc(var(--space-unit) * 2);
            margin-bottom: auto;
        }

        .nav-link {
            font-size: 1.125rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: calc(var(--space-unit) * 1) 0;
            position: relative;
            display: inline-block;
            width: fit-content;
        }

        .nav-link:not(.btn):hover,
        .nav-link.active {
            color: var(--primary);
        }

        .nav-link:not(.btn):hover::after,
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--secondary);
            border-radius: 1.5px;
        }

        /* Hero Content in Text Side */
        .hero-content {
            margin-top: auto;
            margin-bottom: calc(var(--space-unit) * 8);
        }

        .hero-buttons {
            display: flex;
            gap: calc(var(--space-unit) * 3);
            flex-wrap: wrap;
        }

        /* Top Right CTA/Login in Visual Side */
        .nav-visual-top {
            position: absolute;
            top: calc(var(--space-unit) * 5);
            right: calc(var(--space-unit) * 5);
            display: flex;
            gap: calc(var(--space-unit) * 3);
            align-items: center;
            z-index: 10;
        }

        .btn-login {
            background-color: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
            padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 3);
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-login:hover {
            background-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-1px);
        }

        .search-icon {
            color: white;
            font-size: 1.25rem;
            cursor: pointer;
            opacity: 0.8;
            transition: opacity 0.2s ease;
        }

        .search-icon:hover {
            opacity: 1;
        }

        /* Feature Grid */
        .feature-icon {
            width: 64px;
            height: 64px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: calc(var(--space-unit) * 3);
            color: white;
            font-size: 1.75rem;
        }

        /* Case Studies Masonry */
        .masonry-grid {
            column-count: 3;
            column-gap: calc(var(--space-unit) * 4);
        }

        .masonry-item {
            break-inside: avoid;
            margin-bottom: calc(var(--space-unit) * 4);
        }

        .masonry-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background-color: white;
            transition: transform 0.3s ease;
        }

        .masonry-card:hover {
            transform: translateY(-5px);
        }

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

        /* Comparison Table */
        .comparison-card {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: calc(var(--space-unit) * 4);
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }

        .comparison-card.featured {
            border-color: var(--accent);
            box-shadow: var(--shadow-lg);
            position: relative;
        }

        .featured-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--accent);
            color: white;
            padding: calc(var(--space-unit) * 1) calc(var(--space-unit) * 3);
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.875rem;
        }

        .price {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
        }

        .price-unit {
            font-size: 1rem;
            color: var(--text-secondary);
        }

        .feature-list {
            list-style: none;
            padding-left: 0;
        }

        .feature-list li {
            padding: calc(var(--space-unit) * 1) 0;
            border-bottom: 1px dashed var(--border-color);
            display: flex;
            align-items: center;
        }

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

        .feature-list i.fa-check {
            color: var(--secondary);
            margin-right: calc(var(--space-unit) * 2);
        }

        .feature-list i.fa-times {
            color: var(--text-secondary);
            opacity: 0.4;
            margin-right: calc(var(--space-unit) * 2);
        }

        /* Contact CTA */
        .contact-form input,
        .contact-form textarea,
        .contact-form select {
            width: 100%;
            padding: calc(var(--space-unit) * 2) calc(var(--space-unit) * 3);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-family: inherit;
            font-size: 1rem;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            margin-bottom: calc(var(--space-unit) * 3);
        }

        .contact-form input:focus,
        .contact-form textarea:focus,
        .contact-form select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
        }

        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: calc(var(--space-unit) * 4);
        }

        .contact-info-icon {
            background-color: rgba(108, 92, 231, 0.1);
            color: var(--primary);
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: calc(var(--space-unit) * 3);
            flex-shrink: 0;
            font-size: 1.25rem;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: calc(var(--space-unit) * 3) 0;
        }

        .faq-question {
            font-size: 1.125rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-primary);
        }

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

        .faq-question::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            color: var(--secondary);
            transition: transform 0.3s ease;
        }

        .faq-question[aria-expanded="true"]::after {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding-top: calc(var(--space-unit) * 3);
            color: var(--text-secondary);
        }

               /* Footer */
        .site-footer {
            background-color: var(--bg-dark);
            color: var(--text-light);
            padding: calc(var(--space-unit) * 8) 0 calc(var(--space-unit) * 4);
        }

        .footer-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: white;
            margin-bottom: calc(var(--space-unit) * 3);
            display: inline-block;
        }

        .footer-links {
            list-style: none;
            padding-left: 0;
        }

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

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--secondary);
            text-decoration: none;
        }

        .social-links {
            display: flex;
            gap: calc(var(--space-unit) * 2);
        }

        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            transition: background-color 0.2s ease, transform 0.2s ease;
        }

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

        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: calc(var(--space-unit) * 4);
            margin-top: calc(var(--space-unit) * 6);
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.875rem;
        }

        /* Responsive Styles */
        @media (max-width: 1199.98px) {
            .container-custom {
                padding-left: calc(var(--space-unit) * 4);
                padding-right: calc(var(--space-unit) * 4);
            }
            .masonry-grid {
                column-count: 2;
            }
        }

        @media (max-width: 991.98px) {
            /* Split Nav becomes stacked on tablet */
            .nav-split-container {
                flex-direction: column;
                min-height: auto;
            }
            .nav-text-side {
                flex: 1 1 100%;
                padding: calc(var(--space-unit) * 4);
                order: 2;
            }
            .nav-visual-side {
                position: relative;
                flex: 1 1 100%;
                width: 100%;
                height: 60vh;
                order: 1;
                background-position: center 30%;
            }
            .nav-visual-top {
                right: calc(var(--space-unit) * 4);
                top: calc(var(--space-unit) * 4);
            }
            .hero-content {
                margin-top: calc(var(--space-unit) * 4);
                margin-bottom: calc(var(--space-unit) * 4);
            }
            .masonry-grid {
                column-count: 1;
            }
        }

        @media (max-width: 767.98px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.75rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            section {
                padding: calc(var(--space-unit) * 8) 0;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: flex-start;
            }
            .hero-buttons .btn {
                width: 100%;
                text-align: center;
                margin-bottom: calc(var(--space-unit) * 2);
            }
            .nav-text-side {
                padding: calc(var(--space-unit) * 3);
            }
            .nav-visual-top {
                right: calc(var(--space-unit) * 3);
                top: calc(var(--space-unit) * 3);
            }
            .price {
                font-size: 2.5rem;
            }
        }

        @media (max-width: 575.98px) {
            .container-custom {
                padding-left: calc(var(--space-unit) * 3);
                padding-right: calc(var(--space-unit) * 3);
            }
        }

/* roulang page: category1 */
:root {
            /* 主色系 */
            --primary: #6C5CE7;
            --primary-dark: #5b4bda;
            --secondary: #00CEC9;
            --secondary-light: #6df2ee;
            --accent: #FF9F43;
            /* 背景与文字 */
            --bg-light: #FFFFFF;
            --bg-secondary: #F8F9FA;
            --bg-dark: #2D3436;
            --text-primary: #2D3436;
            --text-secondary: #636E72;
            --text-light: #FFFFFF;
            --border-color: #DFE6E9;
            /* 设计Token */
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1.5rem;
            --shadow-sm: 0 0.125rem 0.25rem rgba(108, 92, 231, 0.08);
            --shadow: 0 0.5rem 1rem rgba(108, 92, 231, 0.08);
            --shadow-lg: 0 1rem 2rem rgba(108, 92, 231, 0.12);
            --spacing-unit: 0.5rem;
        }
        * {
            box-sizing: border-box;
        }
        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-light);
            margin: 0;
            padding: 0;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container-custom {
            max-width: 1140px;
            margin: 0 auto;
            padding-left: var(--spacing-unit * 3);
            padding-right: var(--spacing-unit * 3);
        }
        /* 按钮定制 */
        .btn {
            border-radius: var(--radius-sm);
            padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2.5);
            font-weight: 500;
            transition: all 0.25s ease;
            border: none;
        }
        .btn-primary {
            background-color: var(--primary);
            color: white;
        }
        .btn-primary:hover, .btn-primary:focus {
            background-color: var(--primary-dark);
            color: white;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-secondary {
            background-color: var(--secondary);
            color: white;
        }
        .btn-secondary:hover {
            background-color: var(--secondary-light);
            color: var(--text-primary);
            transform: translateY(-2px);
        }
        .btn-accent {
            background-color: var(--accent);
            color: white;
        }
        /* 标签 */
        .badge {
            border-radius: 2rem;
            padding: 0.35em 0.8em;
            font-size: 0.75em;
            font-weight: 600;
            display: inline-block;
        }
        .badge-primary {
            background-color: rgba(108, 92, 231, 0.12);
            color: var(--primary);
        }
        .badge-secondary {
            background-color: rgba(0, 206, 201, 0.12);
            color: var(--secondary);
        }
        /* 导航复用（基于首页结构，切换active状态） */
        .site-header {
            position: relative;
            min-height: 100vh;
            overflow: hidden;
            background: linear-gradient(90deg, var(--bg-light) 40%, transparent 60%);
        }
        @media (max-width: 992px) {
            .site-header {
                background: var(--bg-light);
                min-height: auto;
            }
        }
        .nav-split-container {
            display: flex;
            height: 100%;
        }
        .nav-text-side {
            flex: 0 0 40%;
            max-width: 40%;
            padding: calc(var(--spacing-unit) * 5) calc(var(--spacing-unit) * 4);
            background-color: var(--bg-light);
            position: relative;
            z-index: 2;
        }
        .nav-visual-side {
            flex: 0 0 60%;
            max-width: 60%;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .nav-visual-side::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(45, 52, 54, 0.75);
        }
        @media (max-width: 992px) {
            .nav-split-container {
                flex-direction: column;
            }
            .nav-text-side, .nav-visual-side {
                flex: 0 0 100%;
                max-width: 100%;
                min-height: 60vh;
            }
            .nav-text-side {
                padding: calc(var(--spacing-unit) * 3);
            }
            .nav-visual-side::before {
                background: rgba(45, 52, 54, 0.85);
            }
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            display: inline-block;
            margin-bottom: calc(var(--spacing-unit) * 4);
        }
        .navbar-brand span {
            color: var(--primary);
        }
        .nav-main {
            display: flex;
            gap: calc(var(--spacing-unit) * 2.5);
            margin-bottom: calc(var(--spacing-unit) * 6);
            flex-wrap: wrap;
        }
        .nav-link {
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding-bottom: 0.25rem;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }
        .nav-link.active {
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--secondary);
        }
        .hero-content {
            max-width: 600px;
        }
        .hero-content h1 {
            font-size: 2.8rem;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: calc(var(--spacing-unit) * 2);
            color: var(--text-primary);
        }
        .hero-content .lead {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: calc(var(--spacing-unit) * 3.5);
        }
        .hero-buttons {
            display: flex;
            gap: var(--spacing-unit);
            flex-wrap: wrap;
        }
        .nav-visual-top {
            position: absolute;
            top: calc(var(--spacing-unit) * 3);
            right: calc(var(--spacing-unit) * 3);
            display: flex;
            align-items: center;
            gap: calc(var(--spacing-unit) * 2);
            z-index: 10;
        }
        .btn-login {
            color: var(--text-light);
            font-weight: 500;
            opacity: 0.9;
        }
        .btn-login:hover {
            opacity: 1;
        }
        .search-icon {
            color: var(--text-light);
            font-size: 1.1rem;
        }
        /* 分类页内容 */
        .category-hero {
            background: linear-gradient(rgba(45, 52, 54, 0.9), rgba(45, 52, 54, 0.9)), url('/assets/images/backpic/back-3.webp') no-repeat center center / cover;
            color: white;
            padding: 6rem 0 4rem;
            margin-bottom: 5rem;
            text-align: center;
        }
        .category-hero h1 {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .breadcrumb {
            background: transparent;
            justify-content: center;
            margin-bottom: 0;
        }
        .breadcrumb-item a {
            color: var(--secondary-light);
        }
        .breadcrumb-item.active {
            color: rgba(255, 255, 255, 0.7);
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 2.5rem;
            color: var(--text-primary);
            position: relative;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 4rem;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 3rem;
            max-width: 700px;
        }
        .content-section {
            padding: 5rem 0;
        }
        .content-section:nth-child(even) {
            background-color: var(--bg-secondary);
        }
        .card-tutorial {
            border: none;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card-tutorial:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        .card-tutorial-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .card-tutorial-body {
            padding: 1.75rem;
        }
        .card-tutorial-body h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--text-primary);
        }
        .card-tutorial-body p {
            color: var(--text-secondary);
            margin-bottom: 1.25rem;
        }
        .feature-list {
            list-style: none;
            padding-left: 0;
        }
        .feature-list li {
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            padding-left: 2rem;
        }
        .feature-list li:last-child {
            border-bottom: none;
        }
        .feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 0.75rem;
            color: var(--secondary);
            font-weight: bold;
        }
        .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm) !important;
            overflow: hidden;
            margin-bottom: 1rem;
        }
        .accordion-button {
            font-weight: 600;
            color: var(--text-primary);
            background-color: white;
            padding: 1.25rem 1.5rem;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(108, 92, 231, 0.05);
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.25rem rgba(108, 92, 231, 0.25);
            border-color: var(--primary);
        }
        .accordion-body {
            padding: 1.5rem;
            color: var(--text-secondary);
            background-color: rgba(108, 92, 231, 0.02);
        }
        .cta-block {
            background: linear-gradient(135deg, var(--primary), #5b4bda);
            color: white;
            padding: 5rem 2rem;
            border-radius: var(--radius-lg);
            text-align: center;
            margin: 5rem 0;
        }
        .cta-block h2 {
            color: white;
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
        }
        .cta-block p {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 2.5rem;
        }
        .cta-block .btn {
            background-color: white;
            color: var(--primary);
            font-weight: 600;
            padding: 1rem 2.5rem;
            font-size: 1.1rem;
        }
        .cta-block .btn:hover {
            background-color: var(--bg-secondary);
            color: var(--primary-dark);
        }
        /* 页脚复用 */
        .site-footer {
            background-color: var(--bg-dark);
            color: var(--text-light);
            padding: 5rem 0 2.5rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            display: inline-block;
            margin-bottom: 1rem;
        }
        .footer-logo span {
            color: var(--secondary);
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.75);
            textdecoration: none;
        }
        .footer-links a:hover {
            color: var(--secondary);
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.5rem;
            height: 2.5rem;
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            border-radius: 50%;
            margin-right: 0.75rem;
            transition: background-color 0.2s;
        }
        .social-links a:hover {
            background-color: var(--primary);
            color: white;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }
        .copyright a:hover {
            opacity: 1;
        }
        /* 响应式微调 */
        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .category-hero h1 {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .content-section {
                padding: 3rem 0;
            }
            .nav-main {
                gap: calc(var(--spacing-unit) * 1.5);
            }
        }
        @media (max-width: 576px) {
            .hero-content h1 {
                font-size: 1.8rem;
            }
            .hero-buttons .btn {
                width: 100%;
            }
            .cta-block h2 {
                font-size: 2rem;
            }
        }