/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2d4059;
            --primary-dark: #1d2a3f;
            --primary-light: #4a6382;
            --accent: #d4a373;
            --accent-light: #e8c9a9;
            --accent-dark: #b8895a;
            --bg-warm: #f8f5f0;
            --bg-white: #ffffff;
            --bg-light: #f0ece6;
            --text-dark: #2d2d2d;
            --text-body: #4a4a4a;
            --text-muted: #8a8a8a;
            --text-light: #b0b0b0;
            --border-light: #e8e3dd;
            --border-medium: #d5cfc7;
            --shadow-sm: 0 2px 8px rgba(45, 64, 89, 0.06);
            --shadow-md: 0 8px 30px rgba(45, 64, 89, 0.1);
            --shadow-lg: 0 20px 60px rgba(45, 64, 89, 0.12);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --sidebar-width: 260px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-serif: 'Georgia', 'Times New Roman', serif;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            color: var(--text-body);
            background: var(--bg-warm);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: 4px;
        }

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

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
        }

        /* ===== 侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-white);
            border-right: 1px solid var(--border-light);
            z-index: 1040;
            display: flex;
            flex-direction: column;
            padding: 2rem 1.5rem;
            transition: transform var(--transition);
            box-shadow: 2px 0 20px rgba(45, 64, 89, 0.04);
        }

        .sidebar-logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            margin-bottom: 2.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }

        .sidebar-nav {
            list-style: none;
            padding: 0;
            margin: 0;
            flex: 1;
        }

        .sidebar-nav li {
            margin-bottom: 0.25rem;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.7rem 1rem;
            border-radius: var(--radius-sm);
            color: var(--text-body);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 1.25rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--bg-light);
            color: var(--primary);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(45, 64, 89, 0.25);
        }
        .sidebar-nav a.active i {
            color: #fff;
        }
        .sidebar-nav a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .sidebar-footer {
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
        }

        /* ===== 移动端顶栏 ===== */
        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 1030;
            background: var(--bg-white);
            padding: 0.8rem 1.25rem;
            border-bottom: 1px solid var(--border-light);
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }
        .mobile-topbar .logo-text {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
        }
        .mobile-topbar .logo-text i {
            color: var(--accent);
            margin-right: 0.4rem;
        }
        .mobile-topbar .btn-menu {
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            padding: 0.25rem 0.5rem;
            border-radius: var(--radius-sm);
            cursor: pointer;
        }
        .mobile-topbar .btn-menu:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Offcanvas 定制 ===== */
        .offcanvas.sidebar-offcanvas {
            background: var(--bg-white);
            width: var(--sidebar-width) !important;
        }
        .offcanvas.sidebar-offcanvas .offcanvas-header {
            border-bottom: 1px solid var(--border-light);
            padding: 1.25rem 1.5rem;
        }
        .offcanvas.sidebar-offcanvas .offcanvas-body {
            padding: 1.5rem;
        }
        .offcanvas.sidebar-offcanvas .sidebar-nav a {
            padding: 0.7rem 1rem;
        }
        .offcanvas-backdrop.show {
            opacity: 0.5;
        }

        /* ===== 容器 ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(29, 42, 63, 0.88) 0%, rgba(45, 64, 89, 0.72) 100%);
            z-index: 1;
        }
        .hero-section .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 4rem 1.5rem;
        }
        .hero-section .hero-badge {
            display: inline-block;
            background: rgba(212, 163, 115, 0.2);
            color: var(--accent-light);
            border: 1px solid rgba(212, 163, 115, 0.3);
            padding: 0.3rem 1.2rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 1.5rem;
            backdrop-filter: blur(4px);
        }
        .hero-section h1 {
            font-family: var(--font-serif);
            font-size: 3.5rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 1.25rem;
            letter-spacing: -0.02em;
            max-width: 800px;
        }
        .hero-section h1 span {
            color: var(--accent);
        }
        .hero-section .hero-sub {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin-bottom: 2.5rem;
            line-height: 1.8;
        }
        .hero-section .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .hero-section .btn-hero-primary {
            background: var(--accent);
            color: var(--primary-dark);
            border: none;
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            box-shadow: 0 8px 24px rgba(212, 163, 115, 0.35);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .hero-section .btn-hero-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(212, 163, 115, 0.45);
            color: var(--primary-dark);
        }
        .hero-section .btn-hero-secondary {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.35);
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-weight: 500;
            font-size: 1rem;
            transition: all var(--transition);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .hero-section .btn-hero-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.6);
            color: #fff;
        }

        /* ===== 波形分隔 ===== */
        .wave-divider {
            display: block;
            width: 100%;
            height: 80px;
            fill: var(--bg-warm);
            margin-top: -1px;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 5rem 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-header .section-tag {
            display: inline-block;
            background: var(--accent-light);
            color: var(--primary-dark);
            padding: 0.25rem 1.2rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            margin-bottom: 1rem;
        }
        .section-header h2 {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

        /* ===== 卡片 ===== */
        .card-custom {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2rem;
            transition: all var(--transition);
            height: 100%;
            box-shadow: var(--shadow-sm);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--border-medium);
        }
        .card-custom .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--bg-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent);
            margin-bottom: 1.25rem;
            transition: background var(--transition);
        }
        .card-custom:hover .card-icon {
            background: var(--accent-light);
        }
        .card-custom h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 0.6rem;
        }
        .card-custom p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 0;
        }
        .card-custom .card-link {
            margin-top: 1.25rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            color: var(--accent-dark);
            font-weight: 500;
            font-size: 0.9rem;
        }
        .card-custom .card-link i {
            transition: transform var(--transition);
        }
        .card-custom .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== 卡片带图 ===== */
        .card-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            height: 100%;
        }
        .card-cover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .card-cover .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-cover .cover-body {
            padding: 1.5rem;
        }
        .card-cover .cover-body .cat-tag {
            display: inline-block;
            background: var(--bg-light);
            color: var(--primary-light);
            padding: 0.15rem 0.8rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.6rem;
        }
        .card-cover .cover-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
        .card-cover .cover-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 0;
        }

        /* ===== 步骤流程 ===== */
        .steps-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: center;
            counter-reset: step;
        }
        .step-item {
            flex: 1 1 180px;
            max-width: 220px;
            text-align: center;
            position: relative;
            counter-increment: step;
        }
        .step-item::before {
            content: counter(step);
            display: block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            margin: 0 auto 1rem;
            box-shadow: 0 6px 16px rgba(45, 64, 89, 0.2);
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 0.4rem;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .step-item:not(:last-child)::after {
            content: '→';
            position: absolute;
            right: -1.2rem;
            top: 0.4rem;
            font-size: 1.5rem;
            color: var(--accent);
            font-weight: 300;
        }
        @media (max-width: 768px) {
            .step-item:not(:last-child)::after {
                display: none;
            }
            .step-item {
                flex: 1 1 100%;
                max-width: 100%;
                display: flex;
                align-items: center;
                gap: 1rem;
                text-align: left;
            }
            .step-item::before {
                margin: 0;
                flex-shrink: 0;
            }
            .step-item h4 {
                margin-bottom: 0.1rem;
            }
        }

        /* ===== 统计数据 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
        }
        .stat-item .stat-number {
            font-family: var(--font-serif);
            font-size: 2.8rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 0.25rem;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
            .stat-item .stat-number {
                font-size: 2.2rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            margin-bottom: 0.75rem;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-item .faq-question {
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
            transition: background var(--transition);
        }
        .faq-item .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-item .faq-question:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: -2px;
        }
        .faq-item .faq-question i {
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-body);
            line-height: 1.8;
            font-size: 0.95rem;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
            padding: 5rem 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(45, 64, 89, 0.88);
            z-index: 1;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .cta-section p {
            font-size: 1.15rem;
            opacity: 0.85;
            max-width: 600px;
            margin: 0 auto 2rem;
        }
        .cta-section .btn-cta {
            background: var(--accent);
            color: var(--primary-dark);
            border: none;
            padding: 1rem 3rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: 0 8px 24px rgba(212, 163, 115, 0.35);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
        }
        .cta-section .btn-cta:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 12px 36px rgba(212, 163, 115, 0.5);
            color: var(--primary-dark);
        }

        /* ===== 文章列表 ===== */
        .article-list .article-item {
            display: flex;
            gap: 1.25rem;
            padding: 1.25rem 0;
            border-bottom: 1px solid var(--border-light);
            align-items: flex-start;
        }
        .article-list .article-item:first-child {
            padding-top: 0;
        }
        .article-list .article-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .article-list .article-thumb {
            width: 100px;
            height: 75px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-light);
        }
        .article-list .article-info {
            flex: 1;
            min-width: 0;
        }
        .article-list .article-info .art-cat {
            display: inline-block;
            font-size: 0.75rem;
            color: var(--accent-dark);
            font-weight: 600;
            background: var(--accent-light);
            padding: 0.1rem 0.7rem;
            border-radius: 50px;
            margin-bottom: 0.3rem;
        }
        .article-list .article-info h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 0.3rem;
            line-height: 1.4;
        }
        .article-list .article-info h4 a {
            color: inherit;
            text-decoration: none;
        }
        .article-list .article-info h4 a:hover {
            color: var(--accent-dark);
        }
        .article-list .article-info .art-meta {
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .article-list .article-info .art-excerpt {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-top: 0.2rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        @media (max-width: 576px) {
            .article-list .article-item {
                flex-direction: column;
            }
            .article-list .article-thumb {
                width: 100%;
                height: 160px;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 3.5rem 0 2rem;
        }
        .site-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .site-footer .footer-brand i {
            color: var(--accent);
        }
        .site-footer .footer-desc {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .site-footer h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 0.4rem;
        }
        .site-footer ul a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            text-decoration: none;
            transition: color var(--transition);
        }
        .site-footer ul a:hover {
            color: var(--accent);
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            font-size: 0.85rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 标签 ===== */
        .tag {
            display: inline-block;
            background: var(--bg-light);
            color: var(--primary-light);
            padding: 0.2rem 0.9rem;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .tag:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 991.98px) {
            .sidebar {
                display: none;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-topbar {
                display: flex;
            }
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                min-height: 70vh;
            }
            .section {
                padding: 3.5rem 0;
            }
            .section-header h2 {
                font-size: 2rem;
            }
        }

        @media (max-width: 767.98px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section .hero-sub {
                font-size: 1rem;
            }
            .hero-section .hero-actions {
                flex-direction: column;
            }
            .hero-section .btn-hero-primary,
            .hero-section .btn-hero-secondary {
                width: 100%;
                justify-content: center;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 520px) {
            .hero-section h1 {
                font-size: 1.7rem;
            }
            .section {
                padding: 2.5rem 0;
            }
            .section-header {
                margin-bottom: 2rem;
            }
            .container-custom {
                padding: 0 1rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
        }

        /* ===== 实用工具 ===== */
        .text-accent {
            color: var(--accent) !important;
        }
        .bg-warm {
            background: var(--bg-warm) !important;
        }
        .bg-white {
            background: var(--bg-white) !important;
        }
        .gap-1-5 {
            gap: 1.5rem;
        }
        .mt-neg-1 {
            margin-top: -1rem;
        }

        /* ===== 按钮基础 ===== */
        .btn-outline-primary-custom {
            border: 2px solid var(--primary);
            color: var(--primary);
            background: transparent;
            padding: 0.6rem 1.8rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .btn-outline-primary-custom:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(45, 64, 89, 0.25);
        }

        /* ===== 文章空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 3rem 1.5rem;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            color: var(--border-medium);
            margin-bottom: 1rem;
            display: block;
        }
        .empty-state p {
            font-size: 1rem;
        }

        /* ===== 分类入口卡片增强 ===== */
        .cat-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 100%;
            min-height: 260px;
            display: flex;
            align-items: flex-end;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
        }
        .cat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            color: inherit;
        }
        .cat-card .cat-bg {
            position: absolute;
            inset: 0;
            object-fit: cover;
            width: 100%;
            height: 100%;
            z-index: 0;
        }
        .cat-card .cat-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(29, 42, 63, 0.85) 0%, rgba(29, 42, 63, 0.15) 100%);
            z-index: 1;
        }
        .cat-card .cat-body {
            position: relative;
            z-index: 2;
            padding: 1.5rem;
            width: 100%;
        }
        .cat-card .cat-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.3rem;
        }
        .cat-card .cat-body p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 0;
            line-height: 1.5;
        }
        .cat-card .cat-body .cat-arrow {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            color: var(--accent);
            font-weight: 500;
            font-size: 0.85rem;
            margin-top: 0.6rem;
        }
        .cat-card .cat-body .cat-arrow i {
            transition: transform var(--transition);
        }
        .cat-card:hover .cat-body .cat-arrow i {
            transform: translateX(4px);
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3c6e;
            --primary-light: #2a5a9a;
            --primary-dark: #0f2648;
            --accent: #d4a843;
            --accent-light: #e8c46a;
            --accent-dark: #b8922e;
            --bg-body: #f8f7f4;
            --bg-card: #ffffff;
            --bg-sidebar: #0f2648;
            --bg-sidebar-hover: #1a3c6e;
            --text-primary: #1a1a1a;
            --text-secondary: #5a5a5a;
            --text-muted: #8a8a8a;
            --text-light: #f0efe8;
            --text-sidebar: #c8d0dc;
            --border-color: #e5e2dc;
            --border-light: #f0eee8;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-accent: 0 4px 20px rgba(212, 168, 67, 0.30);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: var(--text-primary);
            font-weight: 600;
            letter-spacing: -0.01em;
        }
        p {
            margin-top: 0;
            margin-bottom: 1rem;
            color: var(--text-secondary);
        }
        ul,
        ol {
            padding-left: 1.25rem;
        }
        figure {
            margin: 0;
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== App Shell Layout ===== */
        .app-shell {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-sidebar);
            color: var(--text-sidebar);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1040;
            display: flex;
            flex-direction: column;
            padding: 0;
            overflow-y: auto;
            transition: transform var(--transition);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
        }
        .sidebar-brand {
            padding: 1.5rem 1.25rem 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.02em;
        }
        .sidebar-brand i {
            color: var(--accent);
            font-size: 1.4rem;
        }
        .sidebar-brand span {
            background: linear-gradient(135deg, #fff 60%, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .sidebar-nav {
            padding: 1rem 0.75rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.7rem 1rem;
            border-radius: var(--radius-sm);
            color: var(--text-sidebar);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 1.25rem;
            text-align: center;
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--bg-sidebar-hover);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--accent-light);
        }
        .sidebar-nav a.active {
            background: var(--primary-light);
            color: #fff;
            box-shadow: 0 2px 10px rgba(42, 90, 154, 0.3);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-divider {
            height: 1px;
            background: rgba(255, 255, 255, 0.06);
            margin: 0.5rem 0.75rem;
        }
        .sidebar-footer {
            padding: 1rem 1.25rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* ===== Top Bar (mobile) ===== */
        .top-bar {
            display: none;
            background: var(--bg-sidebar);
            color: #fff;
            padding: 0.75rem 1.25rem;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 1030;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
        }
        .top-bar .brand-mobile {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: #fff;
        }
        .top-bar .brand-mobile i {
            color: var(--accent);
        }
        .top-bar .menu-toggle {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.4rem;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .top-bar .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== Mobile Overlay ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.45);
            z-index: 1035;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }
        .sidebar-overlay.show {
            display: block;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            background: var(--primary-dark);
            background-image: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            padding: 3rem 0 2.5rem;
            position: relative;
            overflow: hidden;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .article-hero .container-custom {
            position: relative;
            z-index: 1;
        }
        .article-hero .breadcrumb {
            background: none;
            padding: 0;
            margin-bottom: 1rem;
            font-size: 0.85rem;
        }
        .article-hero .breadcrumb-item {
            color: rgba(255, 255, 255, 0.6);
        }
        .article-hero .breadcrumb-item a {
            color: rgba(255, 255, 255, 0.75);
            transition: color var(--transition);
        }
        .article-hero .breadcrumb-item a:hover {
            color: var(--accent-light);
        }
        .article-hero .breadcrumb-item.active {
            color: var(--accent);
        }
        .article-hero .breadcrumb-item+.breadcrumb-item::before {
            color: rgba(255, 255, 255, 0.3);
        }
        .article-hero .article-meta-top {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem 1.5rem;
            align-items: center;
            margin-bottom: 1rem;
        }
        .article-hero .article-category {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 0.2rem 1rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .article-hero .article-date {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .article-hero .article-date i {
            color: var(--accent);
        }
        .article-hero h1 {
            font-size: 2.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
            max-width: 900px;
            letter-spacing: -0.02em;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
        }
        .article-hero .article-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 720px;
            line-height: 1.6;
        }

        /* ===== Article Body ===== */
        .article-section {
            padding: 3rem 0 4rem;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 2.5rem 3rem;
            box-shadow: var(--shadow-md);
        }
        .article-body .content-block {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-body .content-block h2,
        .article-body .content-block h3 {
            margin-top: 2rem;
            margin-bottom: 1rem;
        }
        .article-body .content-block p {
            margin-bottom: 1.25rem;
        }
        .article-body .content-block img {
            border-radius: var(--radius-md);
            margin: 1.5rem auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content-block ul,
        .article-body .content-block ol {
            margin-bottom: 1.25rem;
        }
        .article-body .content-block blockquote {
            border-left: 4px solid var(--accent);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            background: rgba(212, 168, 67, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content-block code {
            background: var(--border-light);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-size: 0.9em;
        }
        .article-body .content-block pre {
            background: #1a1a2e;
            color: #e4e4e4;
            padding: 1.25rem 1.5rem;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.5rem 0;
        }

        /* ===== Article Sidebar / Related ===== */
        .article-sidebar-block {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-light);
        }
        .article-sidebar-block h5 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .article-sidebar-block h5 i {
            color: var(--accent);
        }
        .related-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .related-list li {
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--border-light);
        }
        .related-list li:last-child {
            border-bottom: none;
        }
        .related-list a {
            display: flex;
            gap: 0.75rem;
            align-items: flex-start;
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: color var(--transition);
        }
        .related-list a:hover {
            color: var(--primary-light);
        }
        .related-list a i {
            color: var(--accent);
            font-size: 0.75rem;
            margin-top: 0.3rem;
            flex-shrink: 0;
        }

        /* ===== CTA Section ===== */
        .article-cta {
            background: var(--primary-dark);
            background-image: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 3rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .article-cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.06;
            mix-blend-mode: overlay;
        }
        .article-cta .container-custom {
            position: relative;
            z-index: 1;
        }
        .article-cta h2 {
            color: #fff;
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }
        .article-cta p {
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 1.5rem;
            font-size: 1.05rem;
        }
        .article-cta .btn-cta {
            background: var(--accent);
            color: var(--primary-dark);
            border: none;
            padding: 0.75rem 2.5rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
        }
        .article-cta .btn-cta:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(212, 168, 67, 0.40);
            color: var(--primary-dark);
        }

        /* ===== Footer (reused from index) ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .site-footer .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }
        .site-footer .footer-brand i {
            color: var(--accent);
        }
        .site-footer .footer-desc {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            max-width: 380px;
            line-height: 1.6;
        }
        .site-footer h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 1rem;
            letter-spacing: 0.02em;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 0.5rem;
        }
        .site-footer ul a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .site-footer ul a:hover {
            color: var(--accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 1.5rem;
            margin-top: 2rem;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
        }

        /* ===== Not Found State ===== */
        .not-found-box {
            text-align: center;
            padding: 3rem 1.5rem;
        }
        .not-found-box i {
            font-size: 3rem;
            color: var(--accent);
            margin-bottom: 1rem;
        }
        .not-found-box h2 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }
        .not-found-box p {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
        }
        .not-found-box .btn-back {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 0.6rem 2rem;
            border-radius: 50px;
            font-weight: 500;
            transition: all var(--transition);
        }
        .not-found-box .btn-back:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-body {
                padding: 2rem;
            }
            .article-hero h1 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .top-bar {
                display: flex;
            }
            .article-hero {
                padding: 2rem 0 1.8rem;
            }
            .article-hero h1 {
                font-size: 1.5rem;
            }
            .article-hero .article-desc {
                font-size: 0.95rem;
            }
            .article-body {
                padding: 1.5rem;
                border-radius: var(--radius-md);
            }
            .article-section {
                padding: 2rem 0;
            }
            .article-cta h2 {
                font-size: 1.4rem;
            }
            .site-footer .footer-brand {
                font-size: 1.1rem;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 1rem;
            }
            .article-hero h1 {
                font-size: 1.3rem;
            }
            .article-body {
                padding: 1.25rem;
            }
            .article-body .content-block {
                font-size: 0.95rem;
            }
            .article-hero .article-meta-top {
                gap: 0.5rem 1rem;
            }
            .article-cta h2 {
                font-size: 1.2rem;
            }
            .article-cta .btn-cta {
                padding: 0.6rem 1.5rem;
                font-size: 0.95rem;
            }
        }

        /* ===== Print ===== */
        @media print {
            .sidebar,
            .top-bar,
            .sidebar-overlay,
            .article-cta,
            .site-footer {
                display: none !important;
            }
            .main-content {
                margin-left: 0 !important;
            }
            .article-body {
                box-shadow: none;
                padding: 1rem;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a4b8c;
            --primary-light: #2a6bb5;
            --primary-dark: #0f2f5a;
            --accent: #f0b32a;
            --accent-light: #f7c94e;
            --bg-body: #f5f7fa;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2e;
            --bg-sidebar: #0f1a2e;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-muted: #8a9aaa;
            --text-light: #e8ecf0;
            --text-white: #ffffff;
            --border-color: #e2e6ea;
            --border-light: rgba(255, 255, 255, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-left: var(--sidebar-width);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }
        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        /* ===== 容器 ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 侧边栏导航 (左侧 App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-light);
            z-index: 1040;
            display: flex;
            flex-direction: column;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            transition: transform 0.3s ease;
        }
        .sidebar-brand {
            padding: 20px 20px 16px;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.3px;
        }
        .sidebar-brand i {
            font-size: 1.4rem;
            color: var(--accent);
        }
        .sidebar-nav {
            flex: 1;
            overflow-y: auto;
            padding: 16px 12px;
        }
        .sidebar-nav .nav-item {
            margin-bottom: 4px;
        }
        .sidebar-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .sidebar-nav .nav-link:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white);
        }
        .sidebar-nav .nav-link:hover i {
            color: var(--accent);
        }
        .sidebar-nav .nav-link.active {
            background: rgba(240, 179, 42, 0.15);
            color: var(--accent);
            font-weight: 600;
        }
        .sidebar-nav .nav-link.active i {
            color: var(--accent);
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--bg-sidebar);
            color: var(--text-white);
            z-index: 1050;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            border-bottom: 1px solid var(--border-light);
        }
        .mobile-header .brand {
            font-weight: 700;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .mobile-header .brand i {
            color: var(--accent);
        }
        .mobile-toggle {
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.6rem;
            padding: 4px 8px;
            cursor: pointer;
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            color: var(--accent);
        }

        /* ===== 侧边栏遮罩 ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1035;
        }

        /* ===== 主内容区 ===== */
        .main-content {
            min-height: 100vh;
            padding-top: 0;
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 72px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-white);
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.88) 40%, rgba(26, 75, 140, 0.6) 100%);
            z-index: 1;
        }
        .page-hero .container-custom {
            position: relative;
            z-index: 2;
        }
        .page-hero .breadcrumb-custom {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .page-hero .breadcrumb-custom a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
        }
        .page-hero .breadcrumb-custom a:hover {
            color: var(--accent);
        }
        .page-hero .breadcrumb-custom .sep {
            color: rgba(255, 255, 255, 0.35);
        }
        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .page-hero h1 i {
            color: var(--accent);
            margin-right: 12px;
        }
        .page-hero p.lead {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            line-height: 1.7;
        }
        .page-hero .hero-tags {
            margin-top: 24px;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .page-hero .hero-tags .badge-tag {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(4px);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: var(--transition);
        }
        .page-hero .hero-tags .badge-tag:hover {
            background: rgba(240, 179, 42, 0.2);
            border-color: var(--accent);
            color: var(--accent);
        }

        /* ===== 板块通用 ===== */
        .section-block {
            padding: 72px 0;
        }
        .section-block .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            letter-spacing: -0.3px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-block .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 40px;
        }
        .section-block .section-title i {
            color: var(--primary-light);
            margin-right: 10px;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 0 0 24px 0;
        }

        /* ===== 卡片 ===== */
        .card-custom {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            overflow: hidden;
            height: 100%;
        }
        .card-custom:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-custom .card-img-top {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }
        .card-custom .card-body {
            padding: 24px;
        }
        .card-custom .card-body .card-title {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .card-custom .card-body .card-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card-custom .card-body .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 500;
            background: rgba(26, 75, 140, 0.08);
            color: var(--primary-light);
            margin-bottom: 10px;
        }

        /* ===== 步骤流程 ===== */
        .step-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            position: relative;
            counter-increment: step;
        }
        .step-item::before {
            content: counter(step);
            display: block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.25rem;
            font-weight: 700;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(26, 75, 140, 0.25);
        }
        .step-item .step-title {
            font-weight: 600;
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .step-item .step-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .step-item:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 24px;
            right: -20px;
            width: 24px;
            height: 2px;
            background: var(--border-color);
        }
        @media (max-width: 768px) {
            .step-item:not(:last-child)::after {
                display: none;
            }
        }

        /* ===== 登录方式卡片 ===== */
        .method-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }
        .method-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
        }
        .method-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .method-card .method-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(26, 75, 140, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 1.8rem;
            color: var(--primary-light);
            transition: var(--transition);
        }
        .method-card:hover .method-icon {
            background: var(--primary);
            color: #fff;
        }
        .method-card .method-name {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .method-card .method-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question i {
            color: var(--primary-light);
            transition: transform 0.3s;
            font-size: 1.1rem;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== CTA 区块 ===== */
        .cta-block {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 80px 0;
            text-align: center;
            color: var(--text-white);
            position: relative;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.85) 40%, rgba(26, 75, 140, 0.65) 100%);
            z-index: 1;
        }
        .cta-block .container-custom {
            position: relative;
            z-index: 2;
        }
        .cta-block h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-block p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .btn-cta {
            display: inline-block;
            padding: 14px 40px;
            background: var(--accent);
            color: var(--bg-dark);
            font-weight: 700;
            font-size: 1rem;
            border-radius: 60px;
            border: none;
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-cta:hover {
            background: var(--accent-light);
            color: var(--bg-dark);
            transform: scale(1.03);
            box-shadow: 0 8px 32px rgba(240, 179, 42, 0.35);
        }
        .btn-cta i {
            margin-right: 8px;
        }

        /* ===== 按钮通用 ===== */
        .btn-outline-primary-custom {
            display: inline-block;
            padding: 10px 28px;
            border: 2px solid var(--primary-light);
            color: var(--primary-light);
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            background: transparent;
            text-decoration: none;
        }
        .btn-outline-primary-custom:hover {
            background: var(--primary-light);
            color: #fff;
        }

        /* ===== 标签徽章 ===== */
        .badge-custom {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(26, 75, 140, 0.08);
            color: var(--primary-light);
            border: 1px solid rgba(26, 75, 140, 0.12);
        }
        .badge-accent {
            background: rgba(240, 179, 42, 0.15);
            color: #b8860b;
            border-color: rgba(240, 179, 42, 0.2);
        }

        /* ===== 相关资源卡片 ===== */
        .resource-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 32px;
            border-top: 1px solid var(--border-light);
        }
        .site-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .site-footer .footer-brand i {
            color: var(--accent);
        }
        .site-footer .footer-desc {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 340px;
            line-height: 1.7;
        }
        .site-footer h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.88rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .site-footer ul li a:hover {
            color: var(--accent);
        }
        .site-footer .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            body {
                padding-left: 0;
            }
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                padding-top: var(--header-height);
            }
            .sidebar-overlay.active {
                display: block;
            }
            .page-hero {
                padding: 60px 0 52px;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .section-block {
                padding: 48px 0;
            }
            .section-block .section-title {
                font-size: 1.5rem;
            }
            .page-hero h1 {
                font-size: 1.7rem;
            }
            .page-hero p.lead {
                font-size: 1rem;
            }
            .method-grid {
                grid-template-columns: 1fr;
            }
            .step-list {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .resource-grid {
                grid-template-columns: 1fr;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
            .site-footer .footer-brand {
                font-size: 1.05rem;
            }
        }
        @media (max-width: 520px) {
            .container-custom {
                padding: 0 16px;
            }
            .page-hero h1 {
                font-size: 1.4rem;
            }
            .page-hero .hero-tags .badge-tag {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .step-list {
                grid-template-columns: 1fr;
            }
            .card-custom .card-img-top {
                height: 160px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
            }
            .site-footer {
                padding: 40px 0 24px;
            }
        }

        /* ===== 工具类 ===== */
        .text-accent {
            color: var(--accent);
        }
        .bg-soft-primary {
            background: rgba(26, 75, 140, 0.04);
        }
        .mb-0 {
            margin-bottom: 0 !important;
        }
        .gap-2 {
            gap: 8px !important;
        }
        .gap-3 {
            gap: 16px !important;
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #e67e22;
            --accent-light: #f39c12;
            --accent-dark: #d35400;
            --bg-body: #f8f9fc;
            --bg-card: #ffffff;
            --bg-alt: #eef2f7;
            --bg-dark: #0f2440;
            --text-main: #1e2a3a;
            --text-light: #5a6a7a;
            --text-white: #f0f4fa;
            --border: #dce3ed;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --shadow: 0 8px 32px rgba(26, 58, 92, 0.08);
            --shadow-hover: 0 16px 48px rgba(26, 58, 92, 0.16);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1280px;
            --nav-width: 260px;
            --header-h: 0px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            padding-left: 1.25rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary-dark);
            margin-top: 0;
        }
        p {
            margin-top: 0;
            color: var(--text-light);
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ===== App Shell Layout ===== */
        .app-shell {
            display: flex;
            min-height: 100vh;
        }
        .sidebar-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary-dark);
            color: var(--text-white);
            z-index: 1050;
            display: flex;
            flex-direction: column;
            padding: 0;
            overflow-y: auto;
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 4px 0 24px rgba(0, 0, 0, 0.18);
        }
        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 1.35rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
            color: #fff;
            letter-spacing: 0.3px;
        }
        .sidebar-brand i {
            color: var(--accent-light);
            font-size: 1.6rem;
        }
        .sidebar-brand span {
            background: linear-gradient(135deg, #f0f4fa, #e8edf4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .sidebar-menu {
            padding: 20px 16px;
            flex: 1;
            list-style: none;
            margin: 0;
        }
        .sidebar-menu li {
            margin-bottom: 4px;
        }
        .sidebar-menu a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-menu a i {
            width: 22px;
            text-align: center;
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.45);
            transition: var(--transition);
        }
        .sidebar-menu a:hover {
            background: rgba(255, 255, 255, 0.07);
            color: #fff;
        }
        .sidebar-menu a:hover i {
            color: var(--accent-light);
        }
        .sidebar-menu a.active {
            background: rgba(230, 126, 34, 0.18);
            color: #fff;
            border-left: 3px solid var(--accent-light);
        }
        .sidebar-menu a.active i {
            color: var(--accent-light);
        }
        .sidebar-footer {
            padding: 16px 24px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .page-body {
            flex: 1;
            padding: 32px 0 64px;
        }

        /* ===== Mobile Header (hamburger) ===== */
        .mobile-header {
            display: none;
            background: var(--primary-dark);
            padding: 12px 20px;
            color: #fff;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 1060;
        }
        .mobile-header .brand {
            font-weight: 700;
            font-size: 1.15rem;
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
        }
        .mobile-header .brand i {
            color: var(--accent-light);
        }
        .hamburger {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.45);
            z-index: 1045;
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 70%, var(--primary-light) 100%);
            padding: 72px 0 80px;
            position: relative;
            overflow: hidden;
            margin-top: 0;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .category-hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
        }
        .category-hero .hero-badge {
            display: inline-block;
            background: rgba(230, 126, 34, 0.2);
            color: var(--accent-light);
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(230, 126, 34, 0.2);
        }
        .category-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            line-height: 1.2;
            letter-spacing: -0.5px;
        }
        .category-hero h1 i {
            color: var(--accent-light);
            margin-right: 8px;
        }
        .category-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .category-hero .hero-stats {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            margin-top: 8px;
        }
        .category-hero .hero-stat {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.95rem;
        }
        .category-hero .hero-stat strong {
            color: #fff;
            font-size: 1.4rem;
            display: block;
            font-weight: 700;
        }

        /* ===== Section ===== */
        .section-block {
            padding: 64px 0;
        }
        .section-block.alt-bg {
            background: var(--bg-alt);
        }
        .section-block.dark-bg {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-block .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--primary-dark);
        }
        .section-block .section-sub {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 600px;
            margin-bottom: 40px;
        }
        .section-block.dark-bg .section-title {
            color: #fff;
        }
        .section-block.dark-bg .section-sub {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Cards ===== */
        .card-custom {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: var(--transition);
            box-shadow: var(--shadow);
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .card-custom .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(230, 126, 34, 0.12), rgba(243, 156, 18, 0.08));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .card-custom h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .card-custom p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .card-custom .tag {
            display: inline-block;
            background: rgba(26, 58, 92, 0.07);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            margin-right: 6px;
            margin-top: 12px;
        }

        /* ===== Stats / Data ===== */
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .stat-item .num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 6px;
        }

        /* ===== Accordion / FAQ ===== */
        .accordion-custom .accordion-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm) !important;
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--bg-card);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
        }
        .accordion-custom .accordion-button {
            font-weight: 600;
            color: var(--primary-dark);
            background: var(--bg-card);
            padding: 18px 24px;
            font-size: 1rem;
            box-shadow: none !important;
            border: none;
        }
        .accordion-custom .accordion-button:not(.collapsed) {
            color: var(--accent-dark);
            background: rgba(230, 126, 34, 0.04);
        }
        .accordion-custom .accordion-button::after {
            background-size: 1rem;
            transition: var(--transition);
        }
        .accordion-custom .accordion-body {
            padding: 4px 24px 20px;
            color: var(--text-light);
            font-size: 0.95rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 64px 0;
            border-radius: var(--radius-lg);
            margin: 0 24px;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 0 24px;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .btn-accent {
            background: var(--accent);
            border: none;
            color: #fff;
            padding: 14px 40px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 8px 24px rgba(230, 126, 34, 0.35);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(230, 126, 34, 0.45);
            color: #fff;
        }
        .btn-outline-light {
            border: 2px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            background: transparent;
            padding: 12px 32px;
            border-radius: 40px;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0 28px;
            font-size: 0.9rem;
            margin-left: var(--nav-width);
        }
        .site-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .site-footer .footer-brand i {
            color: var(--accent-light);
        }
        .site-footer .footer-desc {
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
            font-size: 0.9rem;
        }
        .site-footer h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul a {
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
            text-decoration: none;
            font-size: 0.9rem;
        }
        .site-footer ul a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            margin-top: 32px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ===== Checklist ===== */
        .checklist {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .checklist li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
        }
        .checklist li:last-child {
            border-bottom: none;
        }
        .checklist li i {
            color: var(--accent);
            font-size: 1.1rem;
            margin-top: 3px;
            flex-shrink: 0;
        }
        .checklist li strong {
            color: var(--primary-dark);
        }

        /* ===== Steps ===== */
        .step-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }
        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .step-item .step-num {
            font-size: 2.8rem;
            font-weight: 800;
            color: rgba(230, 126, 34, 0.15);
            line-height: 1;
            margin-bottom: 8px;
        }
        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== Image card ===== */
        .img-card {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .img-card:hover {
            box-shadow: var(--shadow-hover);
        }
        .img-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            border-radius: 0;
        }
        .img-card .img-card-body {
            padding: 20px 20px 24px;
            background: var(--bg-card);
        }
        .img-card .img-card-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .img-card .img-card-body p {
            font-size: 0.88rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root {
                --nav-width: 220px;
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .sidebar-nav {
                transform: translateX(-100%);
            }
            .sidebar-nav.open {
                transform: translateX(0);
            }
            .sidebar-overlay.show {
                display: block;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .site-footer {
                margin-left: 0;
            }
            .category-hero {
                padding: 48px 0 56px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero .hero-stats {
                gap: 20px;
            }
            .category-hero .hero-stat strong {
                font-size: 1.2rem;
            }
            .section-block {
                padding: 40px 0;
            }
            .section-block .section-title {
                font-size: 1.5rem;
            }
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .num {
                font-size: 1.8rem;
            }
            .cta-section {
                margin: 0 12px;
                padding: 40px 0;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .step-list {
                grid-template-columns: 1fr;
            }
            .btn-accent,
            .btn-outline-light {
                padding: 12px 28px;
                font-size: 0.9rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .category-hero p {
                font-size: 0.95rem;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .num {
                font-size: 1.5rem;
            }
            .card-custom {
                padding: 20px 16px;
            }
            .section-block .section-title {
                font-size: 1.3rem;
            }
            .cta-section h2 {
                font-size: 1.25rem;
            }
            .container-custom {
                padding: 0 12px;
            }
            .site-footer .footer-brand {
                font-size: 1rem;
            }
        }

        /* ===== Utility ===== */
        .gap-1 { gap: 0.25rem; }
        .gap-2 { gap: 0.5rem; }
        .gap-3 { gap: 1rem; }
        .gap-4 { gap: 1.5rem; }
        .gap-5 { gap: 2rem; }
        .fw-600 { font-weight: 600; }
        .fw-700 { font-weight: 700; }
        .text-accent { color: var(--accent); }
        .text-primary-dark { color: var(--primary-dark); }
        .mb-0 { margin-bottom: 0; }
        .mt-auto { margin-top: auto; }

        /* ===== Breadcrumb ===== */
        .breadcrumb-custom {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            list-style: none;
            padding: 0;
            margin: 0 0 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }
        .breadcrumb-custom li+li::before {
            content: '/';
            margin-right: 8px;
            color: rgba(255, 255, 255, 0.3);
        }
        .breadcrumb-custom a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
        }
        .breadcrumb-custom a:hover {
            color: #fff;
        }
        .breadcrumb-custom .active {
            color: var(--accent-light);
        }

        /* ===== Tag pills ===== */
        .tag-pill {
            display: inline-block;
            background: rgba(230, 126, 34, 0.12);
            color: var(--accent-dark);
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .tag-pill:hover {
            background: var(--accent);
            color: #fff;
        }

        /* ===== Feature grid ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

/* roulang page: category3 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f2b4a;
            --primary-light: #1a3f64;
            --primary-dark: #091c30;
            --accent: #3b8fc2;
            --accent-light: #5ba9d9;
            --accent-dark: #2a6f99;
            --bg-body: #f5f7fa;
            --bg-card: #ffffff;
            --bg-section-alt: #edf1f7;
            --bg-dark: #0b1a2c;
            --text-primary: #1a2634;
            --text-body: #2d3a4a;
            --text-muted: #6b7a8a;
            --text-light: #e8edf3;
            --text-white: #ffffff;
            --border-color: #dce3ed;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --shadow-sm: 0 2px 8px rgba(15, 43, 74, 0.06);
            --shadow-md: 0 6px 24px rgba(15, 43, 74, 0.08);
            --shadow-lg: 0 16px 48px rgba(15, 43, 74, 0.10);
            --shadow-hover: 0 20px 50px rgba(15, 43, 74, 0.14);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-body);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 1rem;
            padding-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        ul,
        ol {
            list-style: none;
            padding-left: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-primary);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }
        h1 {
            font-size: 2.4rem;
        }
        h2 {
            font-size: 1.8rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        h5 {
            font-size: 0.95rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
            font-weight: 600;
        }
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 侧边栏导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border-color);
            z-index: 1040;
            display: flex;
            flex-direction: column;
            padding: 28px 16px 20px;
            box-shadow: 2px 0 12px rgba(15, 43, 74, 0.04);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            padding: 0 12px 20px;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 20px;
        }
        .sidebar-logo i {
            font-size: 1.5rem;
            color: var(--accent);
        }
        .sidebar-logo a {
            color: inherit;
        }
        .sidebar-logo a:hover {
            color: var(--accent);
        }
        .sidebar-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-body);
            font-weight: 500;
            font-size: 0.95rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--bg-section-alt);
            color: var(--primary);
            transform: translateX(4px);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: var(--primary);
            color: var(--text-white);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-nav a.active i {
            color: var(--text-white);
        }
        .sidebar-footer {
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
            font-size: 0.8rem;
            color: var(--text-muted);
            text-align: center;
        }

        /* ===== 移动端菜单切换 ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 14px;
            left: 16px;
            z-index: 1050;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--primary);
            cursor: pointer;
            box-shadow: var(--shadow-sm);
            transition: background var(--transition);
        }
        .sidebar-toggle:hover {
            background: var(--bg-section-alt);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(9, 28, 48, 0.5);
            z-index: 1035;
            backdrop-filter: blur(4px);
        }

        /* ===== 主内容 ===== */
        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        /* ===== Banner ===== */
        .category-banner {
            position: relative;
            padding: 70px 0 80px;
            background: var(--primary-dark);
            color: var(--text-white);
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.18;
            z-index: 0;
        }
        .category-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 80px;
            background: linear-gradient(to top, var(--bg-body), transparent);
            z-index: 1;
        }
        .category-banner .container-custom {
            position: relative;
            z-index: 2;
        }
        .category-banner h1 {
            color: var(--text-white);
            font-size: 2.6rem;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .category-banner h1 i {
            color: var(--accent-light);
            margin-right: 12px;
        }
        .category-banner .breadcrumb {
            background: transparent;
            padding: 0;
            margin-bottom: 14px;
            font-size: 0.9rem;
        }
        .category-banner .breadcrumb-item,
        .category-banner .breadcrumb-item a {
            color: rgba(255, 255, 255, 0.7);
        }
        .category-banner .breadcrumb-item.active {
            color: var(--text-white);
        }
        .category-banner .breadcrumb-item+.breadcrumb-item::before {
            color: rgba(255, 255, 255, 0.4);
        }
        .category-banner p {
            font-size: 1.1rem;
            max-width: 660px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 0;
        }
        .banner-stats {
            display: flex;
            gap: 32px;
            margin-top: 24px;
            flex-wrap: wrap;
        }
        .banner-stats .stat-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, 0.08);
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            backdrop-filter: blur(4px);
        }
        .banner-stats .stat-item i {
            font-size: 1.4rem;
            color: var(--accent-light);
        }
        .banner-stats .stat-item .num {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.2;
        }
        .banner-stats .stat-item .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            color: var(--text-muted);
            max-width: 560px;
            margin: 12px auto 0;
            font-size: 1.05rem;
        }

        /* ===== FAQ 手风琴 ===== */
        .faq-list {
            max-width: 880px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            margin-bottom: 14px;
            border: 1px solid var(--border-color);
            transition: box-shadow var(--transition), border-color var(--transition);
            overflow: hidden;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .faq-question {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            font-family: inherit;
            line-height: 1.4;
        }
        .faq-question:hover {
            background: rgba(59, 143, 194, 0.04);
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: -2px;
        }
        .faq-question .icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            color: var(--accent);
            transition: transform var(--transition), background var(--transition);
        }
        .faq-item.open .faq-question .icon {
            transform: rotate(180deg);
            background: var(--accent);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 28px;
            color: var(--text-body);
            font-size: 0.96rem;
            line-height: 1.75;
            border-top: 0 solid var(--border-color);
        }
        .faq-item.open .faq-answer {
            max-height: 600px;
            padding: 0 28px 22px;
            border-top-width: 1px;
        }
        .faq-answer p {
            margin-top: 14px;
        }
        .faq-answer ul {
            padding-left: 20px;
            list-style: disc;
            margin-top: 8px;
        }
        .faq-answer ul li {
            margin-bottom: 4px;
        }
        .faq-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.03em;
            background: var(--bg-section-alt);
            color: var(--text-muted);
            margin-right: 8px;
        }
        .faq-tag.hot {
            background: #fef0e6;
            color: #c75a1e;
        }
        .faq-tag.new {
            background: #e3f0fa;
            color: #1a6f9e;
        }

        /* ===== 热门文章卡片 ===== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .article-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .article-card .card-img {
            height: 180px;
            background: var(--bg-section-alt);
            overflow: hidden;
        }
        .article-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .article-card:hover .card-img img {
            transform: scale(1.05);
        }
        .article-card .card-body {
            padding: 22px 24px 24px;
        }
        .article-card .card-body .tag {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--bg-section-alt);
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .article-card .card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .article-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 14px;
        }
        .article-card .card-body .read-more {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-card .card-body .read-more i {
            transition: transform var(--transition);
        }
        .article-card .card-body .read-more:hover i {
            transform: translateX(4px);
        }

        /* ===== 分类标签导航 ===== */
        .tag-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-bottom: 40px;
        }
        .tag-nav .tag-btn {
            padding: 8px 22px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-body);
            cursor: pointer;
            transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
        }
        .tag-nav .tag-btn:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(59, 143, 194, 0.04);
        }
        .tag-nav .tag-btn.active {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            color: var(--text-white);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container-custom {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 520px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-section .btn-cta {
            display: inline-block;
            padding: 16px 44px;
            border-radius: 50px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 1.05rem;
            border: none;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 8px 28px rgba(59, 143, 194, 0.35);
        }
        .cta-section .btn-cta:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(59, 143, 194, 0.45);
            color: #fff;
        }
        .cta-section .btn-cta:focus-visible {
            outline: 2px solid var(--text-white);
            outline-offset: 4px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
            margin-top: auto;
        }
        .site-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
        }
        .site-footer .footer-brand i {
            color: var(--accent);
            margin-right: 8px;
        }
        .site-footer .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            max-width: 320px;
        }
        .site-footer h5 {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--text-muted);
            margin-bottom: 14px;
            font-weight: 600;
        }
        .site-footer ul {
            padding: 0;
            list-style: none;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            color: var(--text-body);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .site-footer ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            body {
                padding-left: 0;
            }
            .sidebar {
                transform: translateX(-100%);
                box-shadow: none;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 4px 0 32px rgba(9, 28, 48, 0.2);
            }
            .sidebar-overlay.open {
                display: block;
            }
            .sidebar-toggle {
                display: flex;
            }
            .category-banner {
                padding: 56px 0 70px;
                min-height: 220px;
            }
            .category-banner h1 {
                font-size: 2rem;
            }
            .banner-stats {
                gap: 16px;
            }
            .banner-stats .stat-item {
                padding: 8px 16px;
            }
            .section {
                padding: 50px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .cta-section {
                padding: 44px 28px;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            .category-banner {
                padding: 44px 0 56px;
                min-height: 180px;
            }
            .category-banner h1 {
                font-size: 1.6rem;
            }
            .category-banner h1 i {
                margin-right: 8px;
            }
            .category-banner p {
                font-size: 0.95rem;
            }
            .banner-stats .stat-item .num {
                font-size: 1.1rem;
            }
            .banner-stats .stat-item .label {
                font-size: 0.75rem;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .section-title h2 {
                font-size: 1.4rem;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.9rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 18px;
            }
            .article-grid {
                grid-template-columns: 1fr;
            }
            .tag-nav .tag-btn {
                padding: 6px 16px;
                font-size: 0.82rem;
            }
            .cta-section {
                padding: 36px 20px;
                border-radius: var(--radius-md);
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .cta-section .btn-cta {
                padding: 14px 32px;
                font-size: 0.95rem;
            }
            .site-footer .footer-brand {
                font-size: 1.1rem;
            }
            .site-footer .footer-desc {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            .container-custom {
                padding: 0 16px;
            }
            .category-banner h1 {
                font-size: 1.35rem;
            }
            .category-banner p {
                font-size: 0.88rem;
            }
            .banner-stats {
                gap: 10px;
                flex-direction: column;
            }
            .banner-stats .stat-item {
                width: 100%;
            }
            .faq-question {
                padding: 14px 14px;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 14px;
                font-size: 0.86rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 14px 14px;
            }
            .section-title h2 {
                font-size: 1.2rem;
            }
            .section-title p {
                font-size: 0.9rem;
            }
            .cta-section {
                padding: 28px 16px;
            }
            .cta-section h2 {
                font-size: 1.15rem;
            }
            .cta-section .btn-cta {
                padding: 12px 26px;
                font-size: 0.9rem;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== 额外微交互动画 ===== */
        .fade-in-up {
            opacity: 0;
            transform: translateY(24px);
            animation: fadeInUp 0.5s ease forwards;
        }
        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-up:nth-child(2) {
            animation-delay: 0.1s;
        }
        .fade-in-up:nth-child(3) {
            animation-delay: 0.2s;
        }
        .fade-in-up:nth-child(4) {
            animation-delay: 0.3s;
        }
        .fade-in-up:nth-child(5) {
            animation-delay: 0.4s;
        }
        .fade-in-up:nth-child(6) {
            animation-delay: 0.5s;
        }