/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1724;
            --primary-light: #1a2640;
            --brand: #4f7cff;
            --brand-hover: #3b64e0;
            --brand-light: #eef3ff;
            --accent: #7c5cfc;
            --accent-hover: #6848e8;
            --gold: #f5a623;
            --gold-light: #fef3d9;
            --bg: #ffffff;
            --bg-alt: #f1f5f9;
            --bg-dark: #0c1428;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f8fafc;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(15, 23, 36, 0.08);
            --shadow-hover: 0 12px 40px rgba(15, 23, 36, 0.14);
            --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.3);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --sidebar-width: 240px;
            --header-h: 72px;
            --max-width: 1200px;
        }

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

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

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

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

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

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: all var(--transition);
        }

        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            color: var(--primary);
            font-weight: 700;
        }

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 左侧导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            background: var(--primary);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            transition: transform var(--transition);
            border-right: 1px solid rgba(255, 255, 255, 0.06);
        }
        .sidebar-logo {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--brand);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            color: #fff;
            flex-shrink: 0;
        }
        .sidebar-logo .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
        }
        .sidebar-logo .logo-text span {
            color: var(--brand);
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
        }
        .sidebar-nav .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255, 255, 255, 0.35);
            padding: 16px 12px 8px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.4);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--brand);
        }
        .sidebar-nav a.active {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 4px 16px rgba(79, 124, 255, 0.3);
        }
        .sidebar-nav a.active i {
            color: #fff;
        }

        .sidebar-footer {
            padding: 20px 16px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
        }

        /* ===== 主内容区 ===== */
        .main-wrap {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            background: var(--bg);
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: var(--primary);
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .mobile-header .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .logo-text span {
            color: var(--brand);
        }
        .mobile-header .menu-toggle {
            background: none;
            color: #fff;
            font-size: 24px;
            padding: 8px;
            cursor: pointer;
            border-radius: 8px;
        }
        .mobile-header .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== 移动端遮罩 ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            backdrop-filter: blur(4px);
        }
        .sidebar-overlay.open {
            display: block;
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-dark);
            overflow: hidden;
            padding: 120px 24px 80px;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.5;
            transform: scale(1.05);
            transition: transform 0.6s ease;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 36, 0.88) 0%, rgba(15, 23, 36, 0.5) 50%, rgba(79, 124, 255, 0.2) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 860px;
            animation: fadeUp 0.8s ease forwards;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(79, 124, 255, 0.18);
            border: 1px solid rgba(79, 124, 255, 0.25);
            color: var(--brand);
            padding: 6px 20px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
            backdrop-filter: blur(8px);
        }
        .hero h1 {
            font-size: 56px;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--brand), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 20px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-actions .btn-primary {
            padding: 16px 40px;
            background: var(--brand);
            color: #fff;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            box-shadow: 0 8px 32px rgba(79, 124, 255, 0.35);
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .hero-actions .btn-primary:hover {
            background: var(--brand-hover);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(79, 124, 255, 0.45);
        }
        .hero-actions .btn-secondary {
            padding: 16px 36px;
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            border: 1px solid rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .hero-actions .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            justify-content: center;
            margin-top: 56px;
            flex-wrap: wrap;
        }
        .hero-stats .stat-item {
            text-align: center;
        }
        .hero-stats .stat-num {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stats .stat-num span {
            color: var(--brand);
        }
        .hero-stats .stat-label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 4px;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 90px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3 {
            color: #fff;
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .section-dark .section-header h2 {
            color: #fff;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-light);
            line-height: 1.7;
        }
        .section-dark .section-header p {
            color: rgba(255, 255, 255, 0.6);
        }
        .section-header .badge {
            display: inline-block;
            background: var(--brand-light);
            color: var(--brand);
            padding: 4px 16px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .section-dark .section-header .badge {
            background: rgba(79, 124, 255, 0.2);
            color: var(--brand);
        }

        /* ===== 卡片网格 ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            color: #fff;
        }
        .card .card-icon.brand-bg {
            background: var(--brand);
        }
        .card .card-icon.accent-bg {
            background: var(--accent);
        }
        .card .card-icon.gold-bg {
            background: var(--gold);
        }
        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--primary);
        }
        .card p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            background: var(--brand-light);
            color: var(--brand);
            font-size: 12px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 100px;
            margin-top: 16px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 100px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            background: transparent;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 4px 16px rgba(79, 124, 255, 0.25);
        }
        .btn-primary:hover {
            background: var(--brand-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(79, 124, 255, 0.35);
            color: #fff;
        }
        .btn-outline {
            border: 2px solid var(--border);
            color: var(--text);
        }
        .btn-outline:hover {
            border-color: var(--brand);
            color: var(--brand);
            transform: translateY(-2px);
        }
        .btn-outline-light {
            border: 2px solid rgba(255, 255, 255, 0.2);
            color: #fff;
        }
        .btn-outline-light:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(255, 255, 255, 0.05);
        }
        .btn-gold {
            background: var(--gold);
            color: var(--primary);
            box-shadow: 0 4px 16px rgba(245, 166, 35, 0.3);
        }
        .btn-gold:hover {
            background: #e0951f;
            transform: translateY(-2px);
            color: var(--primary);
        }

        /* ===== 标签/徽章 ===== */
        .badge-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .badge-tag:hover {
            background: var(--brand-light);
            color: var(--brand);
            border-color: var(--brand);
        }
        .badge-tag.brand {
            background: var(--brand-light);
            color: var(--brand);
            border-color: rgba(79, 124, 255, 0.2);
        }

        /* ===== 图文区块 ===== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .feature-block.reverse {
            direction: rtl;
        }
        .feature-block.reverse>* {
            direction: ltr;
        }
        .feature-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-hover);
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        .feature-text h3 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .feature-text .feature-sub {
            color: var(--brand);
            font-weight: 600;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }
        .feature-text p {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .feature-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: var(--text);
        }
        .feature-list li i {
            color: var(--brand);
            font-size: 16px;
            width: 20px;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stats-grid .stat-card {
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition);
        }
        .stats-grid .stat-card:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-4px);
        }
        .stats-grid .stat-number {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stats-grid .stat-number .suffix {
            font-size: 24px;
            color: var(--brand);
        }
        .stats-grid .stat-desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
        }

        /* ===== 内容/资讯列表 ===== */
        .content-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 28px;
        }
        .content-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .content-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .content-card .card-img {
            height: 200px;
            background: var(--bg-alt);
            overflow: hidden;
        }
        .content-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
            border-radius: 0;
        }
        .content-card:hover .card-img img {
            transform: scale(1.05);
        }
        .content-card .card-body {
            padding: 24px 24px 28px;
        }
        .content-card .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .content-card .card-meta .cat {
            background: var(--brand-light);
            color: var(--brand);
            padding: 2px 12px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 12px;
        }
        .content-card .card-meta .date {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .content-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .content-card h3 a {
            color: var(--primary);
        }
        .content-card h3 a:hover {
            color: var(--brand);
        }
        .content-card .excerpt {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .content-card .read-more {
            margin-top: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .content-card .read-more:hover {
            gap: 10px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--brand);
        }
        .faq-item .faq-q {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            user-select: none;
            transition: background var(--transition);
        }
        .faq-item .faq-q:hover {
            background: var(--bg-alt);
        }
        .faq-item .faq-q i {
            font-size: 18px;
            color: var(--brand);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-a {
            max-height: 300px;
            padding: 0 24px 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 100px 0;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(79, 124, 255, 0.15) 0%, transparent 70%);
        }
        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 38px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-content p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.6);
            padding: 56px 24px 32px;
            margin-left: var(--sidebar-width);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            max-width: var(--max-width);
            margin: 0 auto 40px;
        }
        .footer-brand .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .logo-text span {
            color: var(--brand);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer h4 {
            color: #fff;
            font-size: 14px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul li a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            transition: all var(--transition);
        }
        .footer ul li a:hover {
            color: var(--brand);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a:hover {
            color: var(--brand);
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-light);
            font-size: 15px;
        }
        .empty-state i {
            font-size: 40px;
            color: var(--border);
            margin-bottom: 16px;
            display: block;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-block {
                gap: 40px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .main-wrap {
                margin-left: 0;
                padding-top: var(--header-h);
            }
            .footer {
                margin-left: 0;
            }
            body.sidebar-open .sidebar-overlay {
                display: block;
            }

            .hero h1 {
                font-size: 34px;
            }
            .hero p {
                font-size: 17px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stats .stat-num {
                font-size: 26px;
            }

            .section {
                padding: 60px 0;
            }
            .section-header h2 {
                font-size: 28px;
            }

            .grid-3,
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }

            .feature-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .feature-block.reverse {
                direction: ltr;
            }
            .feature-image img {
                height: 260px;
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stats-grid .stat-number {
                font-size: 32px;
            }

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

            .cta-content h2 {
                font-size: 28px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .hero {
                min-height: 80vh;
                padding: 100px 16px 60px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero p {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }

            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }

            .section-header h2 {
                font-size: 24px;
            }
            .card {
                padding: 24px 20px;
            }
            .cta-content h2 {
                font-size: 24px;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --accent: #e94560;
            --accent-hover: #d63851;
            --accent-light: rgba(233, 69, 96, 0.12);
            --gold: #f5a623;
            --gold-light: rgba(245, 166, 35, 0.15);
            --bg: #0f0f1a;
            --bg-card: #1a1a2e;
            --bg-card-hover: #222240;
            --bg-section: #12121f;
            --bg-alt: #1a1a30;
            --text: #f0f0f5;
            --text-secondary: #b0b0c8;
            --text-muted: #7a7a9a;
            --border: rgba(255, 255, 255, 0.08);
            --border-light: rgba(255, 255, 255, 0.12);
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
            --shadow-hover: 0 12px 45px rgba(0, 0, 0, 0.5);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --sidebar-width: 220px;
            --header-height: 0px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--text);
            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;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        ul,
        ol {
            list-style: none;
        }
        ::selection {
            background: var(--accent);
            color: #fff;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            padding: 32px 0 24px;
            overflow-y: auto;
            backdrop-filter: blur(12px);
        }
        .sidebar-logo {
            padding: 0 24px 32px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 24px;
        }
        .logo-text {
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #fff;
        }
        .logo-text span {
            color: var(--accent);
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 0 12px;
            flex: 1;
        }
        .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-muted);
            padding: 0 12px 12px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--accent-light);
            color: var(--text);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: var(--accent-light);
            color: #fff;
            border-left: 3px solid var(--accent);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-footer {
            padding: 20px 24px 0;
            border-top: 1px solid var(--border);
            margin-top: 16px;
            font-size: 12px;
            color: var(--text-muted);
            text-align: center;
        }
        .sidebar-footer a {
            color: var(--text-muted);
            font-size: 12px;
        }
        .sidebar-footer a:hover {
            color: var(--accent);
        }

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

        /* ===== Top Bar (mobile menu trigger) ===== */
        .top-bar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background: var(--primary);
            border-bottom: 1px solid var(--border);
            padding: 14px 20px;
            align-items: center;
            justify-content: space-between;
            backdrop-filter: blur(12px);
        }
        .top-bar .logo-text {
            font-size: 20px;
        }
        .menu-toggle {
            background: none;
            color: var(--text);
            font-size: 22px;
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: var(--accent-light);
            color: var(--accent);
        }

        /* ===== Hero Section ===== */
        .hero {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--bg) 60%);
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 180px;
            background: linear-gradient(to top, var(--bg), transparent);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -1px;
            margin-bottom: 20px;
            color: #fff;
        }
        .hero-content h1 span {
            color: var(--accent);
            position: relative;
        }
        .hero-content p {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 540px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            background: transparent;
            color: var(--text);
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 20px rgba(233, 69, 96, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(233, 69, 96, 0.45);
            color: #fff;
        }
        .btn-outline {
            border: 2px solid var(--border-light);
            color: var(--text);
            background: transparent;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
            background: var(--accent-light);
        }
        .btn-gold {
            background: var(--gold);
            color: #1a1a2e;
            box-shadow: 0 4px 20px rgba(245, 166, 35, 0.3);
        }
        .btn-gold:hover {
            background: #e0951a;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 166, 35, 0.4);
            color: #1a1a2e;
        }
        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }
        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            width: 100%;
            max-width: 520px;
            aspect-ratio: 4/3;
            object-fit: cover;
            border: 1px solid var(--border);
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-light);
            border: 1px solid rgba(233, 69, 96, 0.25);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 13px;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 16px;
        }
        .hero-badge i {
            font-size: 12px;
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
            position: relative;
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            color: #fff;
        }
        .section-header h2 span {
            color: var(--accent);
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--gold-light);
            border: 1px solid rgba(245, 166, 35, 0.2);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            color: var(--gold);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
        }

        /* ===== Features / Cards Grid ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 36px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--gold));
            opacity: 0;
            transition: var(--transition);
        }
        .feature-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card .icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            background: var(--accent-light);
            color: var(--accent);
        }
        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #fff;
        }
        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent-light);
            color: var(--accent);
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            border: 2px solid rgba(233, 69, 96, 0.2);
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
            color: #fff;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Scenarios ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 28px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
            transition: var(--transition);
        }
        .scenario-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .scenario-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            background: var(--gold-light);
            color: var(--gold);
        }
        .scenario-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #fff;
        }
        .scenario-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Stats / Trust ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            padding: 48px 0;
        }
        .stat-item {
            text-align: center;
            padding: 24px 16px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
        }
        .stat-number {
            font-size: 38px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 15px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: #fff;
            background: none;
            width: 100%;
            text-align: left;
            gap: 16px;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question.active i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg) 100%);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 16px;
            color: #fff;
        }
        .cta-section p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary);
            border-top: 1px solid var(--border);
            padding: 56px 0 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo-text {
            font-size: 22px;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
        }
        .footer h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer ul li {
            margin-bottom: 8px;
        }
        .footer ul li a {
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .footer ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Mobile Sidebar Overlay ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            backdrop-filter: blur(4px);
        }
        .sidebar-overlay.active {
            display: block;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-content p {
                max-width: 100%;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-visual {
                order: -1;
            }
            .hero-visual img {
                max-width: 400px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .hero-content h1 {
                font-size: 34px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                width: 260px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .top-bar {
                display: flex;
            }
            .hero {
                padding: 60px 0 50px;
                min-height: auto;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .hero-content p {
                font-size: 16px;
            }
            .hero-visual img {
                max-width: 100%;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 30px;
            }
            .section {
                padding: 50px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .btn {
                padding: 12px 24px;
                font-size: 14px;
            }
            .scenario-card {
                flex-direction: column;
                align-items: center;
                text-align: center;
                padding: 24px 20px;
            }
            .feature-card {
                padding: 28px 20px;
            }
            .step-card {
                padding: 24px 16px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 18px 16px;
                font-size: 14px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 4px 12px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-content h1 {
                font-size: 24px;
            }
            .hero {
                padding: 40px 0 36px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-item {
                padding: 16px 12px;
            }
            .stat-number {
                font-size: 26px;
            }
            .features-grid {
                gap: 16px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .section-header p {
                font-size: 15px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 13px;
            }
            .hero-buttons {
                gap: 10px;
            }
            .footer-grid {
                gap: 20px;
            }
            .sidebar {
                width: 240px;
            }
            .sidebar-logo {
                padding: 0 20px 24px;
            }
            .sidebar-nav a {
                padding: 10px 14px;
                font-size: 14px;
            }
            .logo-text {
                font-size: 19px;
            }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --color-primary: #0f1a2e;
            --color-primary-light: #1a3a5c;
            --color-accent: #d4943a;
            --color-accent-light: #e8b65a;
            --color-accent-lighter: #f5d48a;
            --color-bg: #ffffff;
            --color-bg-alt: #f4f6fa;
            --color-bg-warm: #faf8f5;
            --color-bg-dark: #0b1320;
            --color-text: #1a1a2e;
            --color-text-light: #6b7280;
            --color-text-lighter: #9ca3af;
            --color-text-on-dark: #e8e8ee;
            --color-border: #e5e7eb;
            --color-border-light: #f0f0f5;
            --color-white: #ffffff;
            --color-success: #10b981;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 16px 60px rgba(0,0,0,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 64px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', monospace;
            --max-width: 1120px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            overflow-x: hidden;
        }
        a {
            color: var(--color-primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover { color: var(--color-accent); }
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--color-text);
        }

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

        /* ===== App Shell ===== */
        .app-shell {
            display: flex;
            min-height: 100vh;
        }

        /* ===== Sidebar (Desktop) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-primary);
            color: var(--color-text-on-dark);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: var(--transition);
            overflow-y: auto;
        }
        .sidebar-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 32px 20px;
        }
        .sidebar-logo {
            margin-bottom: 40px;
            padding-bottom: 24px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .logo-text {
            font-size: 26px;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--color-white);
            transition: var(--transition);
        }
        .logo-text span {
            color: var(--color-accent);
        }
        .logo-text:hover {
            opacity: 0.85;
        }
        .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: rgba(255,255,255,0.35);
            margin-bottom: 16px;
            font-weight: 600;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 20px;
            font-size: 16px;
            text-align: center;
        }
        .sidebar-nav a:hover {
            background: rgba(255,255,255,0.08);
            color: var(--color-white);
        }
        .sidebar-nav a.active {
            background: rgba(212, 148, 58, 0.2);
            color: var(--color-accent-light);
        }
        .sidebar-nav a.active i {
            color: var(--color-accent);
        }
        .sidebar-footer {
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 12px;
            color: rgba(255,255,255,0.3);
            text-align: center;
        }

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

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--color-primary);
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            z-index: 999;
            box-shadow: var(--shadow-md);
        }
        .mobile-header .logo-text {
            font-size: 22px;
        }
        .menu-toggle {
            color: var(--color-white);
            font-size: 24px;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(255,255,255,0.1);
        }
        .menu-toggle:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        /* ===== Mobile Sidebar Overlay ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .sidebar-overlay.open {
            opacity: 1;
        }
        .sidebar.mobile-open {
            transform: translateX(0);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(15,26,46,0.85) 0%, rgba(15,26,46,0.5) 60%, rgba(15,26,46,0.3) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 24px;
            max-width: 800px;
            width: 100%;
        }
        .hero-content h1 {
            font-size: 42px;
            font-weight: 800;
            color: var(--color-white);
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .article-meta-top {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-category {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-accent);
            color: var(--color-white);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .article-date {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: rgba(255,255,255,0.8);
            font-size: 14px;
            font-weight: 400;
        }
        .article-date i {
            font-size: 14px;
        }
        @media (max-width: 768px) {
            .article-hero { min-height: 300px; }
            .hero-content { padding: 40px 16px; }
            .hero-content h1 { font-size: 28px; }
            .article-meta-top { gap: 12px; }
        }
        @media (max-width: 520px) {
            .hero-content h1 { font-size: 24px; }
        }

        /* ===== Article Body ===== */
        .article-body {
            padding: 60px 0 40px;
            background: var(--color-bg);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 48px;
        }
        .article-content {
            font-size: 17px;
            line-height: 1.9;
            color: var(--color-text);
        }
        .article-content h1,
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--color-primary);
        }
        .article-content h2 { font-size: 28px; }
        .article-content h3 { font-size: 22px; }
        .article-content p {
            margin-bottom: 20px;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-content ul { list-style: disc; }
        .article-content ol { list-style: decimal; }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            border-left: 4px solid var(--color-accent);
            padding: 16px 24px;
            margin: 24px 0;
            background: var(--color-bg-warm);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--color-text-light);
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 32px 0;
            box-shadow: var(--shadow-md);
        }
        .article-content a {
            color: var(--color-accent);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover {
            color: var(--color-primary-light);
        }
        .article-content pre {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            padding: 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.6;
            margin: 24px 0;
        }
        .article-content code {
            font-family: var(--font-mono);
            font-size: 14px;
            background: var(--color-bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        /* ===== Article Sidebar ===== */
        .article-sidebar {
            position: sticky;
            top: 80px;
            align-self: start;
        }
        .sidebar-widget {
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            padding: 24px;
            margin-bottom: 24px;
            border: 1px solid var(--color-border);
        }
        .sidebar-widget h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--color-primary);
        }
        .sidebar-widget ul li {
            margin-bottom: 10px;
        }
        .sidebar-widget ul li a {
            font-size: 14px;
            color: var(--color-text-light);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .sidebar-widget ul li a:hover {
            color: var(--color-accent);
            padding-left: 4px;
        }
        .sidebar-widget ul li a i {
            font-size: 12px;
            color: var(--color-accent);
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
            border: none;
            padding: 28px 24px;
            text-align: center;
        }
        .sidebar-cta h3 {
            color: var(--color-white);
            font-size: 18px;
        }
        .sidebar-cta p {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            margin: 12px 0 20px;
            line-height: 1.6;
        }
        .sidebar-cta .btn {
            width: 100%;
        }

        /* ===== Article Footer Meta ===== */
        .article-footer-meta {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            display: inline-block;
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid var(--color-border);
        }
        .article-tags .tag:hover {
            background: var(--color-accent-lighter);
            color: var(--color-primary);
            border-color: var(--color-accent);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .article-share span {
            font-size: 14px;
            color: var(--color-text-light);
            font-weight: 500;
        }
        .article-share a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            transition: var(--transition);
            border: 1px solid var(--color-border);
            font-size: 16px;
        }
        .article-share a:hover {
            background: var(--color-accent);
            color: var(--color-white);
            border-color: var(--color-accent);
            transform: translateY(-2px);
        }

        /* ===== Article Not Found ===== */
        .article-not-found {
            text-align: center;
            padding: 80px 24px;
        }
        .article-not-found i {
            font-size: 64px;
            color: var(--color-text-lighter);
            margin-bottom: 24px;
            display: block;
        }
        .article-not-found p {
            font-size: 20px;
            color: var(--color-text-light);
            margin-bottom: 24px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--color-primary);
            color: var(--color-white);
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-light);
            border-color: var(--color-primary-light);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-accent {
            background: var(--color-accent);
            color: var(--color-white);
            border-color: var(--color-accent);
        }
        .btn-accent:hover {
            background: var(--color-accent-light);
            border-color: var(--color-accent-light);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-white);
            border-color: rgba(255,255,255,0.5);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.15);
            border-color: var(--color-white);
            color: var(--color-white);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 20px;
            font-size: 13px;
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 80px 0;
            background: var(--color-bg-alt);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 48px;
            color: var(--color-primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            background: var(--color-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--color-border-light);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .related-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .related-card .card-body {
            padding: 24px;
        }
        .related-card .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--color-primary);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .related-card .card-body .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .related-card .card-body .card-link:hover {
            gap: 10px;
            color: var(--color-primary);
        }
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 600px) {
            .related-grid { grid-template-columns: 1fr; }
            .related-section { padding: 48px 0; }
            .related-section .section-title { font-size: 26px; margin-bottom: 32px; }
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--color-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255,255,255,0.8);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta-section .btn {
            font-size: 16px;
            padding: 16px 40px;
        }
        @media (max-width: 768px) {
            .cta-section { padding: 56px 0; }
            .cta-section h2 { font-size: 28px; }
            .cta-section p { font-size: 16px; }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            padding: 60px 0 0;
        }
        .footer-grid {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .logo-text {
            font-size: 24px;
            display: inline-block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-white);
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul li a {
            font-size: 14px;
            color: rgba(255,255,255,0.5);
            transition: var(--transition);
        }
        .footer ul li a:hover {
            color: var(--color-accent);
            padding-left: 4px;
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 28px 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a {
            color: var(--color-accent-light);
        }
        .footer-bottom a:hover {
            color: var(--color-accent);
        }
        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Responsive - Sidebar Collapse ===== */
        @media (max-width: 1024px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.mobile-open {
                transform: translateX(0);
            }
            .sidebar-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 16px 24px;
            background: var(--color-bg-alt);
            border-bottom: 1px solid var(--color-border-light);
        }
        .breadcrumb-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-text-light);
        }
        .breadcrumb-inner a {
            color: var(--color-text-light);
        }
        .breadcrumb-inner a:hover {
            color: var(--color-accent);
        }
        .breadcrumb-inner .sep {
            color: var(--color-text-lighter);
            font-size: 12px;
        }
        .breadcrumb-inner .current {
            color: var(--color-text);
            font-weight: 500;
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 8px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-32 { margin-bottom: 32px; }
        .gap-8 { gap: 8px; }
        .gap-16 { gap: 16px; }
        .flex { display: flex; }
        .flex-center { align-items: center; justify-content: center; }
        .flex-wrap { flex-wrap: wrap; }

        /* ===== Responsive Article Layout ===== */
        @media (max-width: 900px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
        }
        @media (max-width: 600px) {
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .article-content {
                font-size: 16px;
            }
            .article-content h2 { font-size: 24px; }
            .article-footer-meta {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        /* ===== Animation ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-in {
            animation: fadeInUp 0.6s ease forwards;
        }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }