/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #c8963e;
            --color-primary-light: #e8c97a;
            --color-primary-dark: #9a6f2a;
            --color-accent: #d4a853;
            --color-bg-dark: #0a0a12;
            --color-bg-panel: #0d0d18;
            --color-bg-card: #141424;
            --color-bg-card-hover: #1a1a2e;
            --color-bg-surface: #111122;
            --color-text: #f0f0f5;
            --color-text-strong: #ffffff;
            --color-text-muted: #a0a0b8;
            --color-text-weak: #6b6b82;
            --color-border: #1e1e32;
            --color-border-light: #2a2a42;
            --color-overlay: rgba(8, 8, 18, 0.75);
            --color-overlay-heavy: rgba(6, 6, 14, 0.88);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 40px rgba(200, 150, 60, 0.15);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-display: 'PingFang SC', 'Microsoft YaHei', 'Noto Serif SC', 'STSong', serif;
            --sidebar-width: 260px;
            --topbar-height: 60px;
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg-dark);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
        }
        input {
            font-family: inherit;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text-strong);
        }

        /* ===== 侧边栏导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-bg-panel);
            border-right: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
            z-index: 100;
            transition: transform var(--transition-smooth);
            overflow-y: auto;
            padding: 0;
        }
        .sidebar-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 28px 24px 24px;
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 40px;
            flex-shrink: 0;
        }
        .sidebar-logo .logo-icon {
            width: 42px;
            height: 42px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            flex-shrink: 0;
            box-shadow: var(--shadow-glow);
        }
        .sidebar-logo .logo-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-text-strong);
            letter-spacing: 0.5px;
            line-height: 1.2;
        }
        .sidebar-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: all var(--transition-fast);
            position: relative;
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.04);
            color: var(--color-text);
        }
        .sidebar-nav a.active {
            background: rgba(200, 150, 60, 0.12);
            color: var(--color-primary-light);
            font-weight: 600;
        }
        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background: var(--color-primary);
            border-radius: 0 3px 3px 0;
        }
        .sidebar-nav .nav-icon {
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            flex-shrink: 0;
        }
        .sidebar-footer {
            flex-shrink: 0;
            padding-top: 20px;
            border-top: 1px solid var(--color-border);
            margin-top: 16px;
        }
        .sidebar-footer .sidebar-tagline {
            font-size: 12px;
            color: var(--color-text-weak);
            letter-spacing: 0.3px;
        }

        /* ===== 顶部栏（移动端） ===== */
        .topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--topbar-height);
            background: var(--color-bg-panel);
            border-bottom: 1px solid var(--color-border);
            z-index: 99;
            align-items: center;
            padding: 0 16px;
            justify-content: space-between;
        }
        .topbar-logo {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .topbar-logo .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 800;
            color: #fff;
        }
        .topbar-logo .logo-text {
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-strong);
        }
        .topbar-menu-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--color-text);
            transition: background var(--transition-fast);
        }
        .topbar-menu-btn:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        /* 移动端遮罩 */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 98;
            transition: opacity var(--transition-smooth);
        }
        .sidebar-overlay.visible {
            display: block;
        }

        /* ===== 主内容区 ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            overflow: hidden;
            background: var(--color-bg-dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            z-index: 0;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg,
                    var(--color-overlay-heavy) 0%,
                    rgba(10, 10, 22, 0.7) 40%,
                    var(--color-overlay) 70%,
                    var(--color-bg-dark) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 80px 48px 60px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(200, 150, 60, 0.15);
            border: 1px solid rgba(200, 150, 60, 0.3);
            color: var(--color-primary-light);
            font-size: 13px;
            font-weight: 600;
            padding: 7px 16px;
            border-radius: 50px;
            letter-spacing: 0.8px;
            margin-bottom: 20px;
            text-transform: uppercase;
        }
        .hero-badge .badge-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--color-primary);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 6px var(--color-primary);
            }
            50% {
                opacity: 0.4;
                box-shadow: 0 0 14px var(--color-primary-light);
            }
        }
        .hero h1 {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            margin-bottom: 18px;
            line-height: 1.2;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--color-text-muted);
            max-width: 580px;
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition-bounce);
            white-space: nowrap;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            box-shadow: 0 4px 18px rgba(200, 150, 60, 0.3);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(200, 150, 60, 0.45);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--color-border-light);
            color: var(--color-text);
        }
        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary-light);
            background: rgba(200, 150, 60, 0.06);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: 50px;
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 70px 48px;
        }
        .section-header {
            margin-bottom: 44px;
        }
        .section-label {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 1.5px;
            color: var(--color-primary-light);
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .section-title {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 800;
            color: var(--color-text-strong);
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--color-text-muted);
            max-width: 560px;
        }

        /* ===== 特色卡片网格 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }
        .feature-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 30px 26px 26px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .feature-card:hover {
            background: var(--color-bg-card-hover);
            border-color: var(--color-border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            background: rgba(200, 150, 60, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 18px;
            color: var(--color-primary-light);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: var(--color-text-strong);
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ===== 分类入口卡片 ===== */
        .category-entry-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .category-entry-card {
            display: flex;
            align-items: center;
            gap: 28px;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
            transition: all var(--transition-smooth);
            cursor: pointer;
            overflow: hidden;
            position: relative;
        }
        .category-entry-card:hover {
            background: var(--color-bg-card-hover);
            border-color: var(--color-primary-dark);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }
        .category-entry-card .cat-image {
            width: 140px;
            height: 100px;
            border-radius: var(--radius-md);
            object-fit: cover;
            flex-shrink: 0;
        }
        .category-entry-card .cat-info h3 {
            font-size: 1.3rem;
            margin-bottom: 6px;
        }
        .category-entry-card .cat-info p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
        }
        .category-entry-card .cat-arrow {
            margin-left: auto;
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(200, 150, 60, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--color-primary-light);
            transition: all var(--transition-fast);
        }
        .category-entry-card:hover .cat-arrow {
            background: var(--color-primary);
            color: #fff;
        }

        /* ===== 资讯列表 ===== */
        .news-list {
            display: grid;
            gap: 12px;
        }
        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            transition: all var(--transition-fast);
        }
        .news-item:hover {
            background: var(--color-bg-card-hover);
            border-color: var(--color-border-light);
            box-shadow: var(--shadow-sm);
        }
        .news-item .news-thumb {
            width: 70px;
            height: 50px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .news-item .news-info {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text-strong);
            margin-bottom: 3px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .news-item .news-meta {
            font-size: 0.8rem;
            color: var(--color-text-weak);
            display: flex;
            gap: 12px;
        }
        .news-item .news-arrow {
            flex-shrink: 0;
            color: var(--color-text-weak);
            font-size: 16px;
            transition: color var(--transition-fast);
        }
        .news-item:hover .news-arrow {
            color: var(--color-primary-light);
        }
        .news-empty {
            text-align: center;
            padding: 40px;
            color: var(--color-text-weak);
            font-size: 0.95rem;
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
        }

        /* ===== 统计数据 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            text-align: center;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            transition: all var(--transition-smooth);
        }
        .stat-card:hover {
            border-color: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-primary-light);
            letter-spacing: -1px;
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        /* ===== 流程步骤 ===== */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            position: relative;
        }
        .step-card {
            text-align: center;
            position: relative;
            padding: 20px 16px;
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            margin-bottom: 14px;
            box-shadow: 0 4px 16px rgba(200, 150, 60, 0.25);
        }
        .step-card h4 {
            font-size: 1rem;
            margin-bottom: 4px;
        }
        .step-card p {
            font-size: 0.82rem;
            color: var(--color-text-muted);
        }
        .step-connector {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: grid;
            gap: 10px;
            max-width: 760px;
        }
        .faq-item {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--color-border-light);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 22px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text-strong);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            background: none;
            border: none;
            cursor: pointer;
            font-family: inherit;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--color-primary-light);
            transition: transform var(--transition-fast);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-item.open {
            border-color: var(--color-primary-dark);
            box-shadow: var(--shadow-sm);
        }

        /* ===== CTA 板块 ===== */
        .cta-section {
            background: var(--color-bg-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            left: 50%;
            transform: translateX(-50%);
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(200, 150, 60, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            color: var(--color-text-muted);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }
        .cta-section .btn {
            position: relative;
            z-index: 1;
        }

        /* ===== 页脚 ===== */
        .footer {
            padding: 40px 48px;
            border-top: 1px solid var(--color-border);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            background: var(--color-bg-panel);
        }
        .footer-brand {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text-strong);
        }
        .footer-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--color-primary-light);
        }
        .footer-copy {
            font-size: 0.78rem;
            color: var(--color-text-weak);
            width: 100%;
            text-align: center;
            margin-top: 8px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .sidebar {
                width: 220px;
            }
            :root {
                --sidebar-width: 220px;
            }
            .section {
                padding: 50px 32px;
            }
            .hero-content {
                padding: 60px 32px 44px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-container {
                grid-template-columns: repeat(2, 1fr);
            }
            .cta-section {
                padding: 48px 32px;
            }
            .footer {
                padding: 32px;
            }
            .features-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            }
        }

        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-lg);
                z-index: 101;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.visible {
                display: block;
            }
            .topbar {
                display: flex;
            }
            .main-wrapper {
                margin-left: 0;
                margin-top: var(--topbar-height);
            }
            :root {
                --sidebar-width: 0;
            }
            .hero {
                min-height: 380px;
            }
            .hero-content {
                padding: 44px 20px 36px;
            }
            .hero h1 {
                font-size: 1.7rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .section {
                padding: 40px 20px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .category-entry-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
                padding: 24px 20px;
            }
            .category-entry-card .cat-image {
                width: 100%;
                height: 140px;
            }
            .category-entry-card .cat-arrow {
                margin-left: 0;
                align-self: flex-end;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .steps-container {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .news-item {
                flex-wrap: wrap;
                gap: 10px;
                padding: 14px 16px;
            }
            .news-item .news-thumb {
                width: 100%;
                height: 100px;
            }
            .cta-section {
                padding: 40px 20px;
            }
            .footer {
                flex-direction: column;
                text-align: center;
                padding: 24px 20px;
            }
            .footer-links {
                justify-content: center;
                gap: 16px;
            }
        }

        @media (max-width: 520px) {
            .hero {
                min-height: 340px;
            }
            .hero-content {
                padding: 32px 16px 28px;
            }
            .hero h1 {
                font-size: 1.45rem;
            }
            .hero-desc {
                font-size: 0.85rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                justify-content: center;
                text-align: center;
            }
            .btn {
                padding: 11px 20px;
                font-size: 14px;
            }
            .section {
                padding: 32px 16px;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-card {
                padding: 18px 12px;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .stat-label {
                font-size: 0.75rem;
            }
            .steps-container {
                grid-template-columns: 1fr;
            }
            .feature-card {
                padding: 20px 16px;
            }
            .footer {
                padding: 20px 16px;
                gap: 12px;
            }
        }

/* roulang page: category1 */
/* ==================== 设计变量 ==================== */
        :root {
            --color-primary: #d4a853;
            --color-primary-hover: #e2c17d;
            --color-primary-dark: #b8923e;
            --color-accent: #c9a96e;
            --color-bg-dark: #0a0a14;
            --color-bg-panel: #0d0d1a;
            --color-bg-card: #141428;
            --color-bg-card-hover: #1a1a35;
            --color-bg-elevated: #181830;
            --color-surface: #1c1c34;
            --color-text-primary: #f0f0f5;
            --color-text-secondary: #b0b0c5;
            --color-text-muted: #7a7a95;
            --color-text-on-dark: #e8e8f0;
            --color-border: rgba(255, 255, 255, 0.08);
            --color-border-light: rgba(255, 255, 255, 0.12);
            --color-border-gold: rgba(212, 168, 83, 0.25);
            --color-overlay: rgba(10, 10, 20, 0.7);
            --color-success: #4caf84;
            --color-warning: #e2a83e;

            --sidebar-width: 260px;
            --sidebar-collapsed-width: 0px;
            --header-mobile-height: 60px;

            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;

            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
            --shadow-gold: 0 4px 24px rgba(212, 168, 83, 0.12);

            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-display: 'Georgia', 'Noto Serif SC', 'STSong', 'SimSun', serif;

            --space-xs: 8px;
            --space-sm: 12px;
            --space-md: 20px;
            --space-lg: 32px;
            --space-xl: 48px;
            --space-2xl: 64px;
            --space-3xl: 80px;

            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            font-size: 16px;
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--color-text-primary);
            background-color: var(--color-bg-dark);
            min-height: 100vh;
            display: flex;
            flex-direction: row;
            overflow-x: hidden;
        }

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text-primary);
        }

        h1 {
            font-size: 2.6rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 2rem;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }

        p {
            color: var(--color-text-secondary);
            margin-bottom: 1rem;
        }

        ::selection {
            background-color: var(--color-primary);
            color: #0a0a14;
        }

        /* Focus outline */
        :focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
        }

        /* ==================== Sidebar Navigation (Desktop) ==================== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background-color: var(--color-bg-panel);
            border-right: 1px solid var(--color-border);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: var(--space-xl) var(--space-md);
            transition: transform var(--transition-slow);
            overflow-y: auto;
        }

        .sidebar-logo {
            margin-bottom: var(--space-2xl);
            padding: 0 var(--space-sm);
        }

        .sidebar-logo a {
            font-family: var(--font-display);
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.03em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .sidebar-logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--color-primary);
            box-shadow: 0 0 12px rgba(212, 168, 83, 0.6);
            flex-shrink: 0;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            transition: all var(--transition-base);
            position: relative;
            white-space: nowrap;
        }

        .sidebar-nav a .nav-icon {
            font-size: 0.7rem;
            flex-shrink: 0;
            transition: color var(--transition-base);
            color: var(--color-text-muted);
        }

        .sidebar-nav a:hover {
            background-color: var(--color-bg-card);
            color: var(--color-text-primary);
        }

        .sidebar-nav a:hover .nav-icon {
            color: var(--color-primary);
        }

        .sidebar-nav a.active {
            background-color: var(--color-bg-card);
            color: var(--color-primary);
            font-weight: 600;
            border: 1px solid var(--color-border-gold);
            box-shadow: var(--shadow-gold);
        }

        .sidebar-nav a.active .nav-icon {
            color: var(--color-primary);
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background-color: var(--color-primary);
            border-radius: 0 3px 3px 0;
        }

        .sidebar-footer-info {
            margin-top: auto;
            padding: var(--space-md) var(--space-sm);
            border-top: 1px solid var(--color-border);
            font-size: 0.78rem;
            color: var(--color-text-muted);
            text-align: center;
        }

        /* ==================== Main Content Area ==================== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .main-content {
            flex: 1;
        }

        /* ==================== Mobile Header ==================== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-mobile-height);
            background-color: var(--color-bg-panel);
            border-bottom: 1px solid var(--color-border);
            z-index: 999;
            align-items: center;
            justify-content: space-between;
            padding: 0 var(--space-md);
        }

        .mobile-header .mobile-logo {
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.03em;
        }

        .hamburger-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            z-index: 1001;
            cursor: pointer;
            background: none;
            border: none;
        }

        .hamburger-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--color-text-primary);
            border-radius: 2px;
            transition: all var(--transition-base);
        }

        .hamburger-btn.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition-base);
            pointer-events: none;
        }

        .mobile-overlay.visible {
            opacity: 1;
            pointer-events: auto;
        }

        /* ==================== Container ==================== */
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        .container-wide {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        /* ==================== Breadcrumb ==================== */
        .breadcrumb-bar {
            padding: var(--space-md) 0;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb-bar a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }

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

        .breadcrumb-bar .separator {
            color: var(--color-text-muted);
            opacity: 0.5;
        }

        .breadcrumb-bar .current {
            color: var(--color-primary);
            font-weight: 500;
        }

        /* ==================== Banner / Hero Section ==================== */
        .category-banner {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            overflow: hidden;
            background-color: #0d0d1a;
        }

        .category-banner .banner-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }

        .category-banner .banner-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
        }

        .category-banner .banner-overlay {
            position: absolute;
            inset: 0;
            z-index: 1;
            background: linear-gradient(180deg,
                    rgba(10, 10, 20, 0.55) 0%,
                    rgba(10, 10, 20, 0.75) 50%,
                    rgba(10, 10, 20, 0.95) 100%);
        }

        .category-banner .banner-content {
            position: relative;
            z-index: 2;
            max-width: 750px;
            padding: var(--space-3xl) var(--space-lg);
        }

        .category-banner .banner-tag {
            display: inline-block;
            padding: 6px 18px;
            border: 1px solid var(--color-border-gold);
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--color-primary);
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: var(--space-md);
            backdrop-filter: blur(4px);
            background: rgba(212, 168, 83, 0.08);
        }

        .category-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: #ffffff;
            margin-bottom: var(--space-md);
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            line-height: 1.2;
        }

        .category-banner h1 .highlight {
            color: var(--color-primary);
        }

        .category-banner .banner-subtitle {
            font-size: 1.15rem;
            color: var(--color-text-on-dark);
            opacity: 0.85;
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* ==================== Section Styles ==================== */
        .section {
            padding: var(--space-3xl) 0;
        }

        .section-alt {
            background-color: var(--color-bg-panel);
        }

        .section-header {
            text-align: center;
            margin-bottom: var(--space-2xl);
        }

        .section-header .section-tag {
            display: inline-block;
            font-size: 0.78rem;
            letter-spacing: 0.08em;
            color: var(--color-primary);
            text-transform: uppercase;
            margin-bottom: var(--space-sm);
            font-weight: 600;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: #ffffff;
        }

        .section-header .section-desc {
            color: var(--color-text-muted);
            font-size: 0.95rem;
            max-width: 560px;
            margin: 0 auto;
        }

        /* ==================== Card Grid ==================== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--space-lg);
        }

        .card-grid.cols-3 {
            grid-template-columns: repeat(3, 1fr);
        }

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

        /* ==================== Guide Card ==================== */
        .guide-card {
            background-color: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .guide-card:hover {
            border-color: var(--color-border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-3px);
            background-color: var(--color-bg-card-hover);
        }

        .guide-card .card-img-wrap {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }

        .guide-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .guide-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }

        .guide-card .card-img-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 50%;
            background: linear-gradient(to top, rgba(10, 10, 20, 0.7), transparent);
            pointer-events: none;
        }

        .guide-card .card-body {
            padding: var(--space-md);
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .guide-card .card-number {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.06em;
            margin-bottom: 6px;
        }

        .guide-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: #ffffff;
        }

        .guide-card p {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            margin-bottom: 0;
            flex: 1;
        }

        .guide-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: var(--space-sm);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary);
            transition: gap var(--transition-fast);
        }

        .guide-card .card-link:hover {
            gap: 10px;
            color: var(--color-primary-hover);
        }

        .guide-card .card-link .arrow {
            font-size: 1rem;
            transition: transform var(--transition-fast);
        }

        .guide-card .card-link:hover .arrow {
            transform: translateX(3px);
        }

        /* ==================== Step Timeline ==================== */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-lg);
            max-width: 800px;
            margin: 0 auto;
        }

        .step-item {
            display: flex;
            gap: var(--space-lg);
            align-items: flex-start;
            position: relative;
        }

        .step-item::before {
            content: '';
            position: absolute;
            left: 27px;
            top: 60px;
            bottom: -32px;
            width: 2px;
            background: linear-gradient(to bottom, var(--color-border-gold), var(--color-border));
            z-index: 0;
        }

        .step-item:last-child::before {
            display: none;
        }

        .step-marker {
            flex-shrink: 0;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--color-bg-card);
            border: 2px solid var(--color-border-gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--color-primary);
            position: relative;
            z-index: 1;
            box-shadow: var(--shadow-gold);
        }

        .step-content {
            flex: 1;
            padding-top: 6px;
        }

        .step-content h4 {
            font-size: 1.1rem;
            color: #ffffff;
            margin-bottom: 4px;
        }

        .step-content p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: 0;
        }

        /* ==================== Article List ==================== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .article-item {
            display: flex;
            gap: var(--space-md);
            background-color: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            transition: all var(--transition-base);
            align-items: center;
        }

        .article-item:hover {
            border-color: var(--color-border-gold);
            box-shadow: var(--shadow-sm);
            background-color: var(--color-bg-card-hover);
        }

        .article-item .article-thumb {
            flex-shrink: 0;
            width: 100px;
            height: 70px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background-color: var(--color-bg-elevated);
        }

        .article-item .article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .article-item .article-info {
            flex: 1;
            min-width: 0;
        }

        .article-item .article-info h4 {
            font-size: 1rem;
            margin-bottom: 4px;
            color: #ffffff;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-item .article-info .article-meta {
            font-size: 0.78rem;
            color: var(--color-text-muted);
        }

        .article-item .article-arrow {
            flex-shrink: 0;
            color: var(--color-primary);
            font-size: 1.2rem;
            transition: transform var(--transition-fast);
        }

        .article-item:hover .article-arrow {
            transform: translateX(4px);
        }

        /* ==================== Feature Highlight ==================== */
        .feature-highlight-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: var(--space-lg);
        }

        .feature-highlight-card {
            text-align: center;
            padding: var(--space-xl) var(--space-md);
            background-color: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }

        .feature-highlight-card:hover {
            border-color: var(--color-border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-4px);
        }

        .feature-highlight-card .feature-icon {
            font-size: 2.6rem;
            margin-bottom: var(--space-sm);
            display: block;
        }

        .feature-highlight-card h4 {
            font-size: 1.05rem;
            color: #ffffff;
            margin-bottom: 6px;
        }

        .feature-highlight-card p {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            margin-bottom: 0;
        }

        .feature-highlight-card .feature-stat {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-primary);
            margin: var(--space-sm) 0 4px;
            font-family: var(--font-display);
        }

        /* ==================== FAQ ==================== */
        .faq-list {
            max-width: 750px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .faq-item {
            background-color: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--color-border-light);
        }

        .faq-item .faq-question {
            width: 100%;
            text-align: left;
            padding: var(--space-md);
            font-size: 1rem;
            font-weight: 600;
            color: #ffffff;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: var(--space-md);
            cursor: pointer;
            background: none;
            border: none;
            transition: color var(--transition-fast);
        }

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

        .faq-item .faq-icon {
            flex-shrink: 0;
            font-size: 1.3rem;
            color: var(--color-primary);
            transition: transform var(--transition-base);
        }

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

        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-base);
            padding: 0 var(--space-md);
            color: var(--color-text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--space-md) var(--space-md);
        }

        /* ==================== CTA Section ==================== */
        .cta-section {
            position: relative;
            background-color: var(--color-bg-panel);
            text-align: center;
            padding: var(--space-3xl) var(--space-lg);
            overflow: hidden;
        }

        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            opacity: 0.25;
        }

        .cta-section .cta-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .cta-section .cta-overlay {
            position: absolute;
            inset: 0;
            z-index: 1;
            background: radial-gradient(ellipse at center, rgba(212, 168, 83, 0.06) 0%, rgba(10, 10, 20, 0.9) 70%);
        }

        .cta-section .cta-content {
            position: relative;
            z-index: 2;
            max-width: 600px;
            margin: 0 auto;
        }

        .cta-section h2 {
            font-size: 2rem;
            color: #ffffff;
            margin-bottom: var(--space-md);
        }

        .cta-section p {
            color: var(--color-text-secondary);
            margin-bottom: var(--space-lg);
            font-size: 1rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            transition: all var(--transition-base);
            cursor: pointer;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--color-primary);
            color: #0a0a14;
            border: 2px solid var(--color-primary);
            box-shadow: var(--shadow-gold);
        }

        .btn-primary:hover {
            background-color: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            box-shadow: 0 6px 30px rgba(212, 168, 83, 0.3);
            transform: translateY(-2px);
        }

        .btn-outline {
            background-color: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-border-gold);
        }

        .btn-outline:hover {
            background-color: rgba(212, 168, 83, 0.08);
            border-color: var(--color-primary);
            color: var(--color-primary-hover);
        }

        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }

        /* ==================== Footer ==================== */
        .footer {
            background-color: var(--color-bg-panel);
            border-top: 1px solid var(--color-border);
            padding: var(--space-xl) var(--space-lg);
            text-align: center;
        }

        .footer .footer-brand {
            display: block;
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: var(--space-md);
            letter-spacing: 0.03em;
        }

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

        .footer .footer-links a {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }

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

        .footer .footer-copy {
            font-size: 0.78rem;
            color: var(--color-text-muted);
            opacity: 0.7;
        }

        /* ==================== Responsive ==================== */
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .category-banner h1 {
                font-size: 2.4rem;
            }
            .card-grid.cols-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .section {
                padding: var(--space-2xl) 0;
            }
            h2 {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                z-index: 1000;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: var(--shadow-lg);
            }
            .main-wrapper {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-overlay {
                display: block;
            }
            .main-content {
                padding-top: var(--header-mobile-height);
            }
            .category-banner {
                min-height: 300px;
            }
            .category-banner h1 {
                font-size: 2rem;
            }
            .category-banner .banner-subtitle {
                font-size: 1rem;
            }
            .card-grid.cols-3,
            .card-grid.cols-2 {
                grid-template-columns: 1fr;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .feature-highlight-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-item {
                gap: var(--space-md);
            }
            .step-marker {
                width: 44px;
                height: 44px;
                font-size: 1rem;
            }
            .step-item::before {
                left: 22px;
                top: 48px;
            }
            .article-item .article-thumb {
                width: 70px;
                height: 50px;
            }
            .section {
                padding: var(--space-xl) 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .container,
            .container-wide {
                padding: 0 var(--space-md);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .category-banner h1 {
                font-size: 1.6rem;
            }
            .category-banner .banner-subtitle {
                font-size: 0.9rem;
            }
            .feature-highlight-row {
                grid-template-columns: 1fr;
            }
            .article-item {
                flex-direction: column;
                align-items: flex-start;
            }
            .article-item .article-thumb {
                width: 100%;
                height: 140px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
            .step-item {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--space-sm);
            }
            .step-item::before {
                left: 22px;
                top: 44px;
                bottom: -20px;
            }
            h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: article */
:root {
            --color-sidebar: #0f0f1a;
            --color-sidebar-hover: #1a1a30;
            --color-primary: #1a1a2e;
            --color-accent: #c9a96e;
            --color-accent-light: #e8c97a;
            --color-accent-glow: #f0d78c;
            --color-bg: #fafaf7;
            --color-surface: #ffffff;
            --color-surface-alt: #f5f3ee;
            --color-text: #1e1e24;
            --color-text-strong: #0d0d14;
            --color-text-muted: #6b6560;
            --color-text-weak: #9a948e;
            --color-border: #e6e1da;
            --color-border-light: #f0ece6;
            --color-tag-bg: #fef9f0;
            --color-tag-text: #b8903a;
            --color-tag-border: #f0dca8;
            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.06), 0 1px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.14), 0 8px 20px rgba(0,0,0,0.06);
            --shadow-accent: 0 6px 28px rgba(201,169,110,0.25);
            --sidebar-width: 248px;
            --sidebar-collapsed: 72px;
            --font-sans: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --font-display: 'Noto Sans SC', 'Inter', sans-serif;
            --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            display: flex;
            flex-direction: row;
            overflow-x: hidden;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast), opacity var(--transition-fast);
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            padding: 0;
        }

        input,
        textarea {
            font-family: inherit;
        }

        :focus-visible {
            outline: 3px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-sidebar);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: width var(--transition-smooth), transform var(--transition-smooth);
            border-right: 1px solid rgba(255,255,255,0.06);
            overflow-y: auto;
            overflow-x: hidden;
            box-shadow: 4px 0 40px rgba(0,0,0,0.25);
            flex-shrink: 0;
        }

        .sidebar-logo {
            padding: 28px 24px 20px 24px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }

        .sidebar-logo a {
            display: flex;
            align-items: center;
            gap: 12px;
            font-family: var(--font-display);
            font-weight: 800;
            font-size: 1.15rem;
            letter-spacing: 0.03em;
            color: #f0ede8;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .sidebar-logo a:hover {
            color: var(--color-accent-light);
        }

        .sidebar-logo .logo-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            box-shadow: 0 0 14px var(--color-accent), 0 0 28px rgba(201,169,110,0.5);
            flex-shrink: 0;
            animation: logoPulse 2.4s ease-in-out infinite;
        }

        @keyframes logoPulse {
            0%, 100% { box-shadow: 0 0 14px var(--color-accent), 0 0 28px rgba(201,169,110,0.5); }
            50% { box-shadow: 0 0 22px var(--color-accent-light), 0 0 40px rgba(201,169,110,0.7); }
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            padding: 16px 12px;
            gap: 4px;
            flex: 1;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 18px;
            border-radius: var(--radius-sm);
            color: #c4bfb6;
            font-weight: 500;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .sidebar-nav a .nav-icon {
            font-size: 0.7rem;
            flex-shrink: 0;
            transition: transform var(--transition-fast);
            color: #6b6560;
        }

        .sidebar-nav a:hover {
            background: var(--color-sidebar-hover);
            color: #f0ede8;
        }

        .sidebar-nav a:hover .nav-icon {
            color: var(--color-accent-light);
            transform: scale(1.3);
        }

        .sidebar-nav a.active {
            background: rgba(201,169,110,0.12);
            color: var(--color-accent-light);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--color-accent);
        }

        .sidebar-nav a.active .nav-icon {
            color: var(--color-accent);
        }

        .sidebar-footer-tag {
            padding: 16px 24px;
            border-top: 1px solid rgba(255,255,255,0.06);
            flex-shrink: 0;
        }

        .sidebar-footer-tag span {
            font-size: 0.72rem;
            color: #5a5550;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            transition: margin-left var(--transition-smooth);
            width: calc(100% - var(--sidebar-width));
        }

        .article-banner {
            position: relative;
            width: 100%;
            min-height: 420px;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center 30%;
            background-repeat: no-repeat;
            display: flex;
            align-items: flex-end;
            padding: 0;
            overflow: hidden;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(
                180deg,
                rgba(15,15,26,0.35) 0%,
                rgba(15,15,26,0.6) 40%,
                rgba(15,15,26,0.88) 80%,
                rgba(15,15,26,0.96) 100%
            );
            z-index: 1;
        }

        .article-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(201,169,110,0.12) 0%, transparent 60%);
            z-index: 2;
            pointer-events: none;
        }

        .article-banner-content {
            position: relative;
            z-index: 3;
            width: 100%;
            max-width: 820px;
            padding: 60px 48px 48px 48px;
            margin: 0 auto;
        }

        .article-banner-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 7px 16px;
            background: rgba(201,169,110,0.18);
            border: 1px solid rgba(201,169,110,0.35);
            border-radius: 30px;
            color: var(--color-accent-light);
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 18px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .article-banner-tag .tag-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--color-accent);
            box-shadow: 0 0 8px var(--color-accent);
        }

        .article-banner-title {
            font-family: var(--font-display);
            font-weight: 800;
            font-size: 2.6rem;
            line-height: 1.25;
            color: #faf8f4;
            letter-spacing: 0.02em;
            text-shadow: 0 2px 16px rgba(0,0,0,0.5);
            margin-bottom: 14px;
        }

        .article-banner-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            color: #c4bfb6;
            font-size: 0.9rem;
            font-weight: 400;
            letter-spacing: 0.02em;
        }

        .article-banner-meta .meta-sep {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: #6b6560;
            flex-shrink: 0;
        }

        .article-body-wrapper {
            max-width: 820px;
            margin: -40px auto 0 auto;
            padding: 0 48px;
            position: relative;
            z-index: 10;
        }

        .article-body-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            padding: 48px 52px;
            margin-bottom: 40px;
            position: relative;
        }

        .article-featured-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin: -48px -52px 36px -52px;
            box-shadow: var(--shadow-md);
        }

        .article-featured-image img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
            max-height: 460px;
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--color-text-weak);
            margin-bottom: 28px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--color-border-light);
        }

        .breadcrumb a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
            font-weight: 500;
        }

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

        .breadcrumb .breadcrumb-sep {
            color: var(--color-text-weak);
            font-size: 0.7rem;
        }

        .breadcrumb .breadcrumb-current {
            color: var(--color-text-strong);
            font-weight: 600;
            pointer-events: none;
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
            word-break: break-word;
        }

        .article-content h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.55rem;
            color: var(--color-text-strong);
            margin: 36px 0 16px 0;
            letter-spacing: 0.02em;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--color-border-light);
        }

        .article-content h3 {
            font-family: var(--font-display);
            font-weight: 600;
            font-size: 1.25rem;
            color: var(--color-text-strong);
            margin: 28px 0 12px 0;
            letter-spacing: 0.02em;
        }

        .article-content p {
            margin-bottom: 18px;
        }

        .article-content ul,
        .article-content ol {
            margin: 16px 0;
            padding-left: 24px;
        }

        .article-content li {
            margin-bottom: 8px;
        }

        .article-content blockquote {
            border-left: 4px solid var(--color-accent);
            padding: 18px 24px;
            margin: 24px 0;
            background: var(--color-surface-alt);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-muted);
            font-style: italic;
            font-size: 1rem;
        }

        .article-content img {
            border-radius: var(--radius-sm);
            margin: 20px 0;
            box-shadow: var(--shadow-sm);
        }

        .article-content code {
            background: var(--color-surface-alt);
            padding: 3px 8px;
            border-radius: var(--radius-xs);
            font-size: 0.9em;
            color: #8b6914;
            font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
        }

        .article-content pre {
            background: #1a1a2e;
            color: #e8e4db;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            font-size: inherit;
        }

        .article-not-found {
            text-align: center;
            padding: 80px 40px;
        }

        .article-not-found .not-found-icon {
            font-size: 4rem;
            color: var(--color-text-weak);
            margin-bottom: 20px;
            opacity: 0.5;
        }

        .article-not-found h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--color-text-strong);
            margin-bottom: 12px;
        }

        .article-not-found p {
            color: var(--color-text-muted);
            margin-bottom: 24px;
            font-size: 1rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 26px;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: 30px;
            letter-spacing: 0.03em;
            transition: all var(--transition-fast);
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }

        .btn-primary {
            background: var(--color-accent);
            color: #1a1a2e;
            box-shadow: var(--shadow-accent);
        }

        .btn-primary:hover {
            background: var(--color-accent-light);
            box-shadow: 0 8px 32px rgba(201,169,110,0.35);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: var(--color-text-strong);
            border: 2px solid var(--color-border);
        }

        .btn-outline:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: rgba(201,169,110,0.04);
        }

        .section-related {
            max-width: 820px;
            margin: 0 auto 60px auto;
            padding: 0 48px;
        }

        .section-related .section-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 28px;
        }

        .section-related .section-title {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--color-text-strong);
            letter-spacing: 0.02em;
            position: relative;
            padding-left: 20px;
        }

        .section-related .section-title::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 5px;
            height: 28px;
            border-radius: 3px;
            background: var(--color-accent);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-smooth);
            border: 1px solid var(--color-border-light);
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-border);
        }

        .related-card-image {
            width: 100%;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            position: relative;
            background: var(--color-surface-alt);
        }

        .related-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }

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

        .related-card-body {
            padding: 18px 20px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .related-card-tag {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--color-tag-text);
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .related-card-title {
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.45;
            color: var(--color-text-strong);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition-fast);
        }

        .related-card:hover .related-card-title {
            color: var(--color-accent);
        }

        .related-card-meta {
            font-size: 0.78rem;
            color: var(--color-text-weak);
            margin-top: auto;
            padding-top: 6px;
        }

        .section-cta {
            max-width: 820px;
            margin: 0 auto 60px auto;
            padding: 0 48px;
        }

        .cta-card {
            background: var(--color-primary);
            border-radius: var(--radius-lg);
            padding: 44px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-xl);
        }

        .cta-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(201,169,110,0.1) 0%, transparent 60%);
            pointer-events: none;
        }

        .cta-card h3 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.5rem;
            color: #faf8f4;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }

        .cta-card p {
            color: #c4bfb6;
            margin-bottom: 22px;
            position: relative;
            z-index: 1;
            font-size: 0.95rem;
        }

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

        .footer {
            background: #0f0f1a;
            text-align: center;
            padding: 36px 24px;
            margin-top: auto;
            flex-shrink: 0;
        }

        .footer-brand {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.06em;
            color: #f0ede8;
            display: block;
            margin-bottom: 10px;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #9a948e;
            font-size: 0.88rem;
            font-weight: 500;
            transition: color var(--transition-fast);
        }

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

        .footer-copy {
            color: #5a5550;
            font-size: 0.78rem;
            letter-spacing: 0.03em;
        }

        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 14px;
            left: 14px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-sidebar);
            color: #f0ede8;
            font-size: 1.3rem;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255,255,255,0.1);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .mobile-nav-toggle:hover {
            background: #1a1a30;
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.6);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition-smooth);
            pointer-events: none;
        }

        .sidebar-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .article-banner-title {
                font-size: 2.2rem;
            }
            .article-body-card {
                padding: 36px 32px;
            }
            .article-featured-image {
                margin: -36px -32px 28px -32px;
            }
            .article-body-wrapper,
            .section-related,
            .section-cta {
                padding: 0 28px;
                max-width: 100%;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-banner-content {
                padding: 48px 28px 36px 28px;
            }
        }

        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 260px;
                position: fixed;
                top: 0;
                left: 0;
                height: 100vh;
                z-index: 1000;
                transition: transform var(--transition-smooth);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay {
                display: block;
            }
            .mobile-nav-toggle {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
            }
            .article-banner {
                min-height: 300px;
            }
            .article-banner-title {
                font-size: 1.7rem;
            }
            .article-banner-content {
                padding: 36px 20px 28px 20px;
            }
            .article-body-wrapper,
            .section-related,
            .section-cta {
                padding: 0 16px;
            }
            .article-body-wrapper {
                margin-top: -30px;
            }
            .article-body-card {
                padding: 28px 20px;
                border-radius: var(--radius-md);
            }
            .article-featured-image {
                margin: -28px -20px 24px -20px;
                border-radius: var(--radius-sm);
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .cta-card {
                padding: 32px 24px;
            }
            .cta-card h3 {
                font-size: 1.25rem;
            }
            .article-content {
                font-size: 1rem;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: 0.78rem;
                gap: 4px;
            }
        }

        @media (max-width: 520px) {
            .article-banner {
                min-height: 250px;
            }
            .article-banner-title {
                font-size: 1.35rem;
            }
            .article-banner-meta {
                font-size: 0.78rem;
                gap: 8px;
            }
            .article-body-card {
                padding: 20px 14px;
                border-radius: var(--radius-sm);
            }
            .article-featured-image {
                margin: -20px -14px 20px -14px;
                border-radius: var(--radius-xs);
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .section-related .section-title {
                font-size: 1.2rem;
            }
            .cta-card {
                padding: 24px 16px;
                border-radius: var(--radius-md);
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.88rem;
            }
            .article-banner-content {
                padding: 28px 14px 20px 14px;
            }
            .article-body-wrapper {
                margin-top: -24px;
            }
            .footer {
                padding: 24px 16px;
            }
            .article-content blockquote {
                padding: 14px 16px;
                margin: 16px 0;
            }
            .breadcrumb {
                margin-bottom: 16px;
                padding-bottom: 14px;
            }
        }