/* roulang page: index */
/* ========== 设计变量 ========== */
        :root {
            --primary: #3b82f6;
            --primary-hover: #2563eb;
            --primary-light: #eff6ff;
            --primary-dark: #1d4ed8;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --accent-light: #fffbeb;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #1e293b;
            --bg-darker: #0f172a;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-light: #94a3b8;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);
            --sidebar-width: 250px;
            --header-mobile-height: 60px;
            --transition: 0.2s ease;
            --transition-slow: 0.3s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        }

        /* ========== 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;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea, select {
            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(--text);
        }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 0.75rem; }

        /* ========== 容器 ========== */
        .container {
            width: 100%;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container--narrow {
            max-width: 860px;
        }
        .section {
            padding: 72px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            color: var(--text);
        }
        .section-header .section-subtitle {
            color: var(--text-weak);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* ========== 左侧导航（桌面端固定侧边栏） ========== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-white);
            border-right: 1px solid var(--border);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            transition: transform var(--transition-slow), box-shadow var(--transition-slow);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-logo {
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-light);
            flex-shrink: 0;
        }
        .sidebar-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.01em;
        }
        .sidebar-logo .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 14px;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-weak);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .sidebar-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .sidebar-nav a.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }
        .sidebar-nav a .nav-icon {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            flex-shrink: 0;
        }
        .sidebar-footer .sidebar-copyright {
            font-size: 0.75rem;
            color: var(--text-light);
            line-height: 1.5;
        }

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

        /* ========== 移动端顶部栏 ========== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-mobile-height);
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            z-index: 999;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }
        .mobile-header .mobile-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text);
        }
        .mobile-header .mobile-logo .logo-icon {
            width: 32px;
            height: 32px;
            border-radius: 6px;
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 0.9rem;
            font-weight: 800;
        }
        .hamburger-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            cursor: pointer;
            z-index: 1002;
        }
        .hamburger-btn span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text);
            border-radius: 3px;
            transition: all var(--transition);
        }

        /* 移动端菜单开关（checkbox hack） */
        #mobile-menu-toggle {
            display: none;
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.45);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition-slow);
            pointer-events: none;
        }

        /* ========== Hero 首屏 ========== */
        .hero {
            position: relative;
            padding: 80px 0 100px;
            background: linear-gradient(135deg, #1e3a5f 0%, #1a2740 40%, #0f1d30 100%);
            overflow: hidden;
            color: #fff;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            mix-blend-mode: soft-light;
            pointer-events: none;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(59,130,246,0.15) 0%, transparent 60%),
                        radial-gradient(ellipse at 70% 60%, rgba(245,158,11,0.08) 0%, transparent 50%);
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 680px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255,255,255,0.12);
            border: 1px solid rgba(255,255,255,0.2);
            color: #fff;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .hero h1 .highlight {
            color: var(--accent);
        }
        .hero-desc {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.8);
            margin-bottom: 32px;
            line-height: 1.7;
            max-width: 540px;
        }
        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        /* ========== 按钮系统 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
            cursor: pointer;
            border: 2px solid transparent;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(59,130,246,0.5);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            border-color: var(--primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(59,130,246,0.35);
            color: #fff;
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(245,158,11,0.35);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border-color: rgba(255,255,255,0.4);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: rgba(255,255,255,0.7);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--text);
            border-color: var(--border);
        }
        .btn-outline-dark:hover {
            background: var(--bg);
            border-color: var(--text-weak);
            color: var(--text);
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }

        /* ========== 板块通用 ========== */
        .section--light {
            background: var(--bg-white);
        }
        .section--gray {
            background: var(--bg);
        }
        .section--dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section--dark h2,
        .section--dark h3,
        .section--dark .section-subtitle {
            color: var(--text-white);
        }
        .section--dark .section-subtitle {
            color: rgba(255,255,255,0.65);
        }

        /* ========== 平台介绍卡片 ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-card .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.5rem;
            color: var(--primary);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: var(--text);
        }
        .feature-card p {
            color: var(--text-weak);
            font-size: 0.9rem;
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ========== 分类入口卡片 ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
            display: block;
            aspect-ratio: 16 / 9;
            min-height: 260px;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }
        .category-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .category-card:hover img {
            transform: scale(1.05);
        }
        .category-card .category-card-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.2) 50%, rgba(0,0,0,0.1) 100%);
        }
        .category-card .category-card-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 28px;
            color: #fff;
            z-index: 2;
        }
        .category-card .category-card-content h3 {
            color: #fff;
            font-size: 1.35rem;
            margin-bottom: 6px;
        }
        .category-card .category-card-content p {
            color: rgba(255,255,255,0.8);
            font-size: 0.9rem;
            margin-bottom: 0;
        }
        .category-card .category-tag {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        /* ========== 最新信息列表 ========== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .news-card .news-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--bg);
        }
        .news-card .news-card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .news-card-meta {
            display: flex;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-bottom: 8px;
            flex-wrap: wrap;
        }
        .news-card .news-card-meta .news-tag {
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 10px;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.75rem;
        }
        .news-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-card h3 a {
            color: var(--text);
        }
        .news-card h3 a:hover {
            color: var(--primary);
        }
        .news-card .news-card-desc {
            color: var(--text-weak);
            font-size: 0.88rem;
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-empty {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-weak);
            font-size: 1rem;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 2px dashed var(--border);
        }

        /* ========== 数据亮点 ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .stat-card .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
            letter-spacing: -0.02em;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-weak);
            font-weight: 500;
        }

        /* ========== 服务特色图文区块 ========== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .feature-block.reverse {
            direction: rtl;
        }
        .feature-block.reverse .feature-block-text {
            direction: ltr;
        }
        .feature-block-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            aspect-ratio: 4 / 3;
        }
        .feature-block-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .feature-block-text h2 {
            font-size: 1.8rem;
            margin-bottom: 16px;
        }
        .feature-block-text p {
            color: var(--text-weak);
            font-size: 1rem;
            line-height: 1.7;
        }
        .feature-block-text .feature-list {
            margin-top: 16px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .feature-block-text .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--text);
            font-size: 0.95rem;
        }
        .feature-block-text .feature-list li::before {
            content: '✓';
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: #d1fae5;
            color: #10b981;
            font-weight: 700;
            font-size: 0.75rem;
            flex-shrink: 0;
            margin-top: 2px;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
            border-color: #cbd5e1;
        }
        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text);
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform var(--transition);
            color: var(--text-light);
            font-size: 0.7rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 0.9rem;
            color: var(--text-weak);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item.open {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59,130,246,0.08);
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 64px 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 1.9rem;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.8);
            font-size: 1.05rem;
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .btn {
            font-size: 1rem;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--bg-darker);
            color: var(--text-white);
            padding: 48px 0 28px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col p,
        .footer-col li {
            color: rgba(255,255,255,0.6);
            font-size: 0.88rem;
            line-height: 1.7;
            margin-bottom: 4px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .footer-col ul a {
            color: rgba(255,255,255,0.6);
            transition: color var(--transition);
        }
        .footer-col ul a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.4);
        }

        /* ========== 响应式设计 ========== */
        @media (max-width: 1024px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .hero h1 { font-size: 2.3rem; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .news-list { grid-template-columns: 1fr 1fr; }
            .feature-block { gap: 32px; }
            .category-grid { grid-template-columns: 1fr 1fr; }
            .section { padding: 52px 0; }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
            }
            /* 隐藏桌面侧边栏 */
            .sidebar {
                transform: translateX(-100%);
                width: 270px;
                box-shadow: none;
            }
            #mobile-menu-toggle:checked ~ .sidebar {
                transform: translateX(0);
                box-shadow: var(--shadow-xl);
            }
            #mobile-menu-toggle:checked ~ .sidebar-overlay {
                display: block;
                opacity: 1;
                pointer-events: auto;
            }
            .sidebar-overlay {
                display: block;
            }
            /* 显示移动端顶部栏 */
            .mobile-header {
                display: flex;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-mobile-height);
            }
            .hero {
                padding: 60px 0 70px;
            }
            .hero h1 { font-size: 1.9rem; }
            .hero-desc { font-size: 1rem; }
            .features-grid { grid-template-columns: 1fr; gap: 20px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .news-list { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .feature-block.reverse {
                direction: ltr;
            }
            .feature-block-image {
                aspect-ratio: 16 / 9;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .section-header h2 { font-size: 1.6rem; }
            .container { padding: 0 16px; }
            .btn { padding: 10px 22px; font-size: 0.9rem; }
            .btn-lg { padding: 12px 28px; font-size: 0.95rem; }
        }

        @media (max-width: 520px) {
            .hero h1 { font-size: 1.6rem; }
            .hero { padding: 48px 0 56px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-card { padding: 20px 14px; }
            .stat-card .stat-number { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .section { padding: 40px 0; }
            .section-header { margin-bottom: 32px; }
            .section-header h2 { font-size: 1.4rem; }
            .feature-card { padding: 24px 18px; }
            .cta-section { padding: 44px 0; }
            .cta-section h2 { font-size: 1.5rem; }
        }

/* roulang page: article */
:root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #3b82f6;
            --color-primary-bg: #eff6ff;
            --color-accent: #f59e0b;
            --color-accent-light: #fef3c7;
            --color-bg: #f1f5f9;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-secondary: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-sidebar-bg: #ffffff;
            --color-sidebar-hover: #f8fafc;
            --color-sidebar-active: #eff6ff;
            --color-sidebar-text: #475569;
            --color-sidebar-active-text: #2563eb;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-xl: 0 16px 40px rgba(0,0,0,0.1);
            --sidebar-width: 260px;
            --sidebar-width-tablet: 220px;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'Consolas', 'Monaco', monospace;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

        *,*::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:1.6;color:var(--color-text);background:var(--color-bg);min-height:100vh}
        img{max-width:100%;height:auto;display:block}
        a{color:inherit;text-decoration:none;transition:color var(--transition-fast)}
        button{cursor:pointer;font-family:inherit;border:none;background:none}
        ul,ol{list-style:none}
        input,textarea{font-family:inherit;font-size:inherit}
        :focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:2px}

        .app-layout{display:flex;min-height:100vh}

        /* Sidebar */
        .sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--color-sidebar-bg);border-right:1px solid var(--color-border);z-index:100;display:flex;flex-direction:column;overflow-y:auto;transition:transform var(--transition-slow),box-shadow var(--transition-base)}
        .sidebar-brand{padding:28px 24px 20px;border-bottom:1px solid var(--color-border-light)}
        .sidebar-logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--color-text);letter-spacing:-0.01em}
        .sidebar-logo .logo-icon{width:38px;height:38px;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;flex-shrink:0}
        .sidebar-logo .logo-text{line-height:1.2}
        .sidebar-logo .logo-sub{font-size:0.7rem;color:var(--color-text-muted);font-weight:400;display:block}
        .sidebar-nav{flex:1;padding:16px 12px;display:flex;flex-direction:column;gap:4px}
        .sidebar-nav a{display:flex;align-items:center;gap:10px;padding:11px 16px;border-radius:var(--radius-md);font-size:0.95rem;font-weight:500;color:var(--color-sidebar-text);transition:all var(--transition-fast);position:relative}
        .sidebar-nav a .nav-icon{font-size:1.1rem;width:24px;text-align:center;flex-shrink:0}
        .sidebar-nav a:hover{background:var(--color-sidebar-hover);color:var(--color-text)}
        .sidebar-nav a.active{background:var(--color-sidebar-active);color:var(--color-sidebar-active-text);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 a:focus-visible{outline-offset:-2px}
        .sidebar-footer{padding:16px 24px;border-top:1px solid var(--color-border-light);font-size:0.78rem;color:var(--color-text-muted)}

        /* Main */
        .main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;display:flex;flex-direction:column}
        .main-inner{flex:1;padding:0}

        /* Mobile header */
        .mobile-header{display:none;position:sticky;top:0;z-index:99;background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:0 16px;height:56px;align-items:center;justify-content:space-between}
        .mobile-header .mobile-logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;color:var(--color-text)}
        .mobile-header .mobile-logo .logo-icon{width:32px;height:32px;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));display:flex;align-items:center;justify-content:center;color:#fff;font-size:0.9rem}
        .mobile-menu-btn{width:40px;height:40px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.3rem;color:var(--color-text);transition:background var(--transition-fast)}
        .mobile-menu-btn:hover{background:var(--color-sidebar-hover)}
        .sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.45);z-index:99;opacity:0;transition:opacity var(--transition-slow);pointer-events:none}
        .sidebar-overlay.show{opacity:1;pointer-events:auto}

        /* Article area */
        .article-page{padding:32px 40px;max-width:900px;margin:0 auto;width:100%}
        .breadcrumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:0.85rem;color:var(--color-text-muted);margin-bottom:24px}
        .breadcrumb a{color:var(--color-text-secondary);transition:color var(--transition-fast)}
        .breadcrumb a:hover{color:var(--color-primary)}
        .breadcrumb .sep{font-size:0.7rem;color:var(--color-text-muted)}
        .breadcrumb .current{color:var(--color-text);font-weight:500}

        .article-header{margin-bottom:28px}
        .article-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}
        .article-cat{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;background:var(--color-primary-bg);color:var(--color-primary);border-radius:20px;font-size:0.8rem;font-weight:600;letter-spacing:0.02em}
        .article-date{font-size:0.85rem;color:var(--color-text-muted);display:flex;align-items:center;gap:4px}
        .article-date i{font-size:0.8rem}
        .article-title-h1{font-size:2rem;font-weight:700;line-height:1.3;color:var(--color-text);letter-spacing:-0.01em;margin-bottom:8px}
        .article-excerpt{font-size:1.05rem;color:var(--color-text-secondary);line-height:1.7}

        .article-cover{margin-bottom:32px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md);aspect-ratio:16/9;background:var(--color-border-light)}
        .article-cover img{width:100%;height:100%;object-fit:cover;display:block}

        .article-body{background:var(--color-surface);border-radius:var(--radius-lg);padding:36px 40px;box-shadow:var(--shadow-sm);border:1px solid var(--color-border-light);margin-bottom:40px}
        .article-content{font-size:1.03rem;line-height:1.85;color:var(--color-text);word-break:break-word}
        .article-content h2{font-size:1.5rem;font-weight:700;margin:32px 0 14px;color:var(--color-text);line-height:1.35}
        .article-content h3{font-size:1.2rem;font-weight:600;margin:24px 0 10px;color:var(--color-text)}
        .article-content p{margin-bottom:16px}
        .article-content ul,.article-content ol{margin:12px 0 20px 20px}
        .article-content li{margin-bottom:6px;padding-left:4px}
        .article-content ul li{list-style-type:disc}
        .article-content ol li{list-style-type:decimal}
        .article-content blockquote{margin:20px 0;padding:16px 22px;border-left:4px solid var(--color-primary);background:var(--color-primary-bg);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--color-text-secondary);font-style:italic}
        .article-content img{border-radius:var(--radius-md);margin:20px 0;max-width:100%}
        .article-content a{color:var(--color-primary);text-decoration:underline;text-underline-offset:3px}
        .article-content a:hover{color:var(--color-primary-dark)}
        .article-content code{background:var(--color-border-light);padding:2px 7px;border-radius:4px;font-family:var(--font-mono);font-size:0.9em;color:var(--color-primary-dark)}
        .article-content pre{background:#1e293b;color:#e2e8f0;padding:20px 24px;border-radius:var(--radius-md);overflow-x:auto;margin:20px 0;font-size:0.9rem;line-height:1.6}
        .article-content pre code{background:none;padding:0;color:inherit}
        .article-content hr{border:none;border-top:1px solid var(--color-border);margin:28px 0}

        /* Not found */
        .not-found-state{text-align:center;padding:60px 20px;background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border-light)}
        .not-found-icon{font-size:4rem;margin-bottom:16px;color:var(--color-text-muted)}
        .not-found-state h2{font-size:1.5rem;margin-bottom:8px;color:var(--color-text)}
        .not-found-state p{color:var(--color-text-secondary);margin-bottom:24px}
        .btn-back{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;background:var(--color-primary);color:#fff;border-radius:var(--radius-md);font-weight:600;font-size:0.95rem;transition:all var(--transition-fast)}
        .btn-back:hover{background:var(--color-primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}
        .btn-back:active{transform:translateY(0)}

        /* Related */
        .related-section{margin-bottom:40px}
        .related-section .section-label{font-size:0.8rem;text-transform:uppercase;letter-spacing:0.06em;color:var(--color-text-muted);margin-bottom:8px;font-weight:600}
        .related-section h3{font-size:1.4rem;font-weight:700;margin-bottom:20px;color:var(--color-text)}
        .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
        .related-card{background:var(--color-surface);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--color-border-light);transition:all var(--transition-base);display:flex;flex-direction:column}
        .related-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--color-border)}
        .related-card-img{aspect-ratio:16/10;overflow:hidden;background:var(--color-border-light)}
        .related-card-img img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}
        .related-card:hover .related-card-img img{transform:scale(1.04)}
        .related-card-body{padding:14px 16px 16px;flex:1;display:flex;flex-direction:column}
        .related-card-cat{font-size:0.72rem;color:var(--color-primary);font-weight:600;margin-bottom:6px;letter-spacing:0.03em}
        .related-card-title{font-size:0.93rem;font-weight:600;line-height:1.4;color:var(--color-text);margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .related-card-date{font-size:0.78rem;color:var(--color-text-muted);margin-top:auto}

        /* Footer */
        .site-footer{background:var(--color-surface);border-top:1px solid var(--color-border);padding:40px 40px 24px;margin-top:auto}
        .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;max-width:900px;margin:0 auto}
        .footer-col h4{font-size:0.95rem;font-weight:700;margin-bottom:12px;color:var(--color-text)}
        .footer-col p{font-size:0.85rem;color:var(--color-text-secondary);line-height:1.7}
        .footer-col ul{display:flex;flex-direction:column;gap:8px}
        .footer-col ul li{font-size:0.85rem;color:var(--color-text-secondary)}
        .footer-col ul li a{color:var(--color-text-secondary);transition:color var(--transition-fast)}
        .footer-col ul li a:hover{color:var(--color-primary)}
        .footer-bottom{border-top:1px solid var(--color-border-light);margin-top:28px;padding-top:18px;text-align:center;font-size:0.8rem;color:var(--color-text-muted);max-width:900px;margin-left:auto;margin-right:auto}

        /* Responsive */
        @media(max-width:1024px){
            .sidebar{width:var(--sidebar-width-tablet)}
            .main-content{margin-left:var(--sidebar-width-tablet)}
            .article-page{padding:24px 28px}
            .related-grid{grid-template-columns:repeat(2,1fr)}
            .footer-grid{grid-template-columns:1fr 1fr}
        }
        @media(max-width:768px){
            .sidebar{transform:translateX(-100%);position:fixed;width:280px;z-index:101;box-shadow:var(--shadow-xl)}
            .sidebar.open{transform:translateX(0)}
            .sidebar-overlay{display:block}
            .sidebar-overlay.show{opacity:1;pointer-events:auto}
            .main-content{margin-left:0}
            .mobile-header{display:flex}
            .article-page{padding:20px 16px}
            .article-title-h1{font-size:1.55rem}
            .article-body{padding:22px 18px}
            .article-content{font-size:0.98rem;line-height:1.75}
            .related-grid{grid-template-columns:repeat(2,1fr);gap:12px}
            .footer-grid{grid-template-columns:1fr;gap:20px}
            .site-footer{padding:28px 20px 20px}
        }
        @media(max-width:520px){
            .article-page{padding:14px 10px}
            .article-title-h1{font-size:1.3rem}
            .article-body{padding:16px 12px;border-radius:var(--radius-md)}
            .article-content{font-size:0.93rem;line-height:1.7}
            .article-cover{border-radius:var(--radius-md)}
            .related-grid{grid-template-columns:1fr}
            .breadcrumb{font-size:0.78rem}
            .article-cover{margin-bottom:20px}
            .related-section h3{font-size:1.15rem}
            .footer-grid{gap:16px}
        }

/* roulang page: category1 */
:root {
            --primary: #2c3e6b;
            --primary-light: #3d5191;
            --primary-dark: #1a2747;
            --accent: #e8594f;
            --accent-light: #f07068;
            --accent-dark: #c9443b;
            --surface: #ffffff;
            --bg: #f4f6f9;
            --bg-alt: #ebeff5;
            --text: #1e2235;
            --text-secondary: #5a6072;
            --text-weak: #8b90a0;
            --border: #dde2eb;
            --border-light: #eef1f6;
            --shadow-sm: 0 1px 3px rgba(28, 32, 50, 0.06);
            --shadow-md: 0 4px 16px rgba(28, 32, 50, 0.08);
            --shadow-lg: 0 8px 32px rgba(28, 32, 50, 0.12);
            --shadow-xl: 0 16px 48px rgba(28, 32, 50, 0.16);
            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --sidebar-width: 230px;
            --sidebar-collapsed: 72px;
            --header-height: 60px;
            --transition-fast: 0.18s ease;
            --transition-normal: 0.28s ease;
            --transition-slow: 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
            --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
            --font-heading: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
        }

        *,
        *::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-body);
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

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

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

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            outline: none;
            transition: all var(--transition-fast);
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(44, 62, 107, 0.35);
            outline-offset: 3px;
            border-radius: var(--radius-xs);
        }

        input {
            font-family: inherit;
            border: none;
            outline: none;
        }

        ul {
            list-style: none;
        }

        /* ===== SIDEBAR ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary-dark);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition-slow), width var(--transition-slow);
            box-shadow: 4px 0 24px rgba(14, 20, 38, 0.2);
            overflow-y: auto;
            overflow-x: hidden;
        }

        .sidebar-logo {
            padding: 28px 20px 20px;
            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-heading);
            font-weight: 700;
            font-size: 1.3rem;
            color: #ffffff;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent), #f5906b);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 14px rgba(232, 89, 79, 0.35);
        }

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

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.72);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .sidebar-nav a:hover {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.06);
        }

        .sidebar-nav a.active {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.12);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--accent);
        }

        .sidebar-nav a .nav-icon {
            width: 22px;
            text-align: center;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

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

        .sidebar-nav-section {
            padding: 8px 16px 4px;
            font-size: 0.72rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: rgba(255, 255, 255, 0.35);
            font-weight: 600;
            margin-top: 4px;
        }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            flex-shrink: 0;
        }

        .sidebar-footer .sidebar-version {
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.3);
            letter-spacing: 0.04em;
        }

        /* ===== MAIN CONTENT ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            transition: margin-left var(--transition-slow);
        }

        /* ===== MOBILE HEADER ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--primary-dark);
            z-index: 999;
            align-items: center;
            padding: 0 16px;
            box-shadow: var(--shadow-md);
        }

        .mobile-header .hamburger {
            background: none;
            color: #fff;
            font-size: 1.5rem;
            padding: 8px;
            border-radius: var(--radius-xs);
            flex-shrink: 0;
        }

        .mobile-header .mobile-logo {
            flex: 1;
            text-align: center;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.1rem;
            color: #fff;
            letter-spacing: 0.03em;
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            backdrop-filter: blur(2px);
        }

        .sidebar-overlay.active {
            display: block;
        }

        /* ===== PAGE BANNER ===== */
        .page-banner {
            background: linear-gradient(160deg, #1a2747 0%, #2c3e6b 35%, #3d5191 70%, #1a2747 100%);
            position: relative;
            overflow: hidden;
            padding: 60px 40px;
            color: #ffffff;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: linear-gradient(to top, var(--bg) 0%, transparent 100%);
        }

        .page-banner-content {
            position: relative;
            z-index: 2;
            max-width: 1000px;
        }

        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
        }

        .page-banner .breadcrumb a:hover {
            color: #ffffff;
        }

        .page-banner .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
            font-size: 0.7rem;
        }

        .page-banner h1 {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .page-banner .banner-desc {
            font-size: 1.08rem;
            color: rgba(255, 255, 255, 0.78);
            max-width: 560px;
            line-height: 1.6;
        }

        .banner-stats-row {
            display: flex;
            gap: 32px;
            margin-top: 28px;
            flex-wrap: wrap;
        }

        .banner-stat-item {
            display: flex;
            align-items: baseline;
            gap: 6px;
        }

        .banner-stat-num {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-light);
            letter-spacing: -0.03em;
        }

        .banner-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* ===== CONTAINER ===== */
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .section {
            padding: 56px 0;
        }

        .section-header {
            margin-bottom: 36px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--accent);
            background: rgba(232, 89, 79, 0.08);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 10px;
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.01em;
            line-height: 1.3;
        }

        .section-desc {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-top: 8px;
            max-width: 600px;
        }

        /* ===== FILTER TAGS ===== */
        .filter-tags-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }

        .filter-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            border-radius: 24px;
            font-size: 0.88rem;
            font-weight: 500;
            border: 1.5px solid var(--border);
            background: var(--surface);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            user-select: none;
        }

        .filter-tag:hover {
            border-color: var(--primary-light);
            color: var(--primary);
            background: rgba(44, 62, 107, 0.04);
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }

        .filter-tag.active {
            background: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(44, 62, 107, 0.3);
        }

        .filter-tag .tag-count {
            font-size: 0.75rem;
            opacity: 0.7;
            background: rgba(0, 0, 0, 0.06);
            padding: 2px 8px;
            border-radius: 12px;
            min-width: 26px;
            text-align: center;
        }

        .filter-tag.active .tag-count {
            background: rgba(255, 255, 255, 0.2);
            opacity: 1;
        }

        /* ===== ACTIVITY CARDS GRID ===== */
        .activity-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .activity-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .activity-card-image {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-alt);
        }

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

        .activity-card:hover .activity-card-image img {
            transform: scale(1.06);
        }

        .activity-card-badge {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 5px 12px;
            border-radius: 16px;
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            color: #fff;
            z-index: 2;
        }

        .badge-hot {
            background: linear-gradient(135deg, #e8594f, #f5906b);
            box-shadow: 0 3px 10px rgba(232, 89, 79, 0.35);
        }

        .badge-new {
            background: linear-gradient(135deg, #3d5191, #5b73c0);
            box-shadow: 0 3px 10px rgba(44, 62, 107, 0.35);
        }

        .badge-upcoming {
            background: linear-gradient(135deg, #f0a030, #f5c460);
            box-shadow: 0 3px 10px rgba(240, 160, 48, 0.35);
            color: #5a3e08;
        }

        .activity-card-status {
            position: absolute;
            top: 14px;
            right: 14px;
            padding: 5px 10px;
            border-radius: 14px;
            font-size: 0.72rem;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.9);
            color: var(--text);
            backdrop-filter: blur(6px);
            z-index: 2;
            letter-spacing: 0.02em;
        }

        .activity-card-body {
            padding: 20px 18px 14px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .activity-card-category {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 0.04em;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        .activity-card-title {
            font-family: var(--font-heading);
            font-size: 1.08rem;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .activity-card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-bottom: 10px;
        }

        .activity-card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .activity-card-meta i {
            font-size: 0.7rem;
            color: var(--text-weak);
        }

        .activity-card-summary {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.55;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-top: auto;
        }

        .activity-card-footer {
            padding: 12px 18px 16px;
            border-top: 1px solid var(--border-light);
        }

        .activity-card-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            transition: gap var(--transition-fast);
        }

        .activity-card-btn:hover {
            color: var(--accent);
            gap: 10px;
        }

        .activity-card-btn i {
            font-size: 0.7rem;
            transition: transform var(--transition-fast);
        }

        .activity-card-btn:hover i {
            transform: translateX(3px);
        }

        /* ===== EMPTY STATE ===== */
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-weak);
        }

        .empty-state i {
            font-size: 3rem;
            display: block;
            margin-bottom: 16px;
            opacity: 0.5;
        }

        .empty-state p {
            font-size: 1rem;
            color: var(--text-secondary);
        }

        /* ===== HOT SIDEBAR (inline in main content) ===== */
        .hot-section {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }

        .hot-section .hot-title {
            font-family: var(--font-heading);
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
        }

        .hot-section .hot-title i {
            color: var(--accent);
            font-size: 1rem;
        }

        .hot-list-item {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition-fast);
        }

        .hot-list-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .hot-list-item:first-child {
            padding-top: 0;
        }

        .hot-list-item:hover {
            opacity: 0.85;
        }

        .hot-list-rank {
            font-family: var(--font-heading);
            font-size: 1.5rem;
            font-weight: 900;
            color: var(--accent);
            min-width: 36px;
            text-align: center;
            line-height: 1;
            flex-shrink: 0;
            letter-spacing: -0.03em;
        }

        .hot-list-rank.silver {
            color: #8b95b0;
        }

        .hot-list-rank.bronze {
            color: #c0a070;
        }

        .hot-list-info h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 3px;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .hot-list-info .hot-meta {
            font-size: 0.75rem;
            color: var(--text-weak);
        }

        /* ===== UPCOMING TIMELINE ===== */
        .timeline-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .timeline-item {
            display: flex;
            gap: 20px;
            padding: 22px 0;
            border-bottom: 1px solid var(--border-light);
            position: relative;
            transition: background var(--transition-fast);
        }

        .timeline-item:last-child {
            border-bottom: none;
        }

        .timeline-date-badge {
            flex-shrink: 0;
            width: 70px;
            height: 70px;
            border-radius: var(--radius-md);
            background: linear-gradient(145deg, var(--primary-light), var(--primary-dark));
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: #fff;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

        .timeline-date-badge .date-day {
            font-family: var(--font-heading);
            font-size: 1.6rem;
            font-weight: 800;
            line-height: 1;
            letter-spacing: -0.03em;
        }

        .timeline-date-badge .date-month {
            font-size: 0.72rem;
            font-weight: 500;
            opacity: 0.85;
            letter-spacing: 0.04em;
        }

        .timeline-content {
            flex: 1;
        }

        .timeline-content h4 {
            font-family: var(--font-heading);
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 4px;
            line-height: 1.35;
        }

        .timeline-content .timeline-meta {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-bottom: 6px;
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .timeline-content p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== CTA SECTION ===== */
        .cta-section {
            background: linear-gradient(150deg, #1a2747 0%, #2c3e6b 50%, #3d5191 100%);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            color: #ffffff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -30px;
            left: -30px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .cta-section h3 {
            font-family: var(--font-heading);
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 24px;
            font-size: 0.95rem;
            position: relative;
            z-index: 1;
        }

        .cta-subscribe-form {
            display: flex;
            gap: 10px;
            max-width: 480px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .cta-subscribe-form input {
            flex: 1;
            padding: 14px 20px;
            border-radius: 28px;
            font-size: 0.9rem;
            background: rgba(255, 255, 255, 0.1);
            border: 1.5px solid rgba(255, 255, 255, 0.2);
            color: #ffffff;
            transition: all var(--transition-fast);
        }

        .cta-subscribe-form input::placeholder {
            color: rgba(255, 255, 255, 0.45);
        }

        .cta-subscribe-form input:focus {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.5);
            outline: none;
            box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.08);
        }

        .btn-subscribe {
            padding: 14px 28px;
            border-radius: 28px;
            background: var(--accent);
            color: #ffffff;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.03em;
            white-space: nowrap;
            box-shadow: 0 6px 20px rgba(232, 89, 79, 0.4);
            transition: all var(--transition-fast);
        }

        .btn-subscribe:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(232, 89, 79, 0.5);
        }

        .btn-subscribe:active {
            transform: translateY(0);
            box-shadow: 0 4px 14px rgba(232, 89, 79, 0.35);
        }

        /* ===== TWO COLUMN LAYOUT ===== */
        .two-col {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 28px;
            align-items: start;
        }

        /* ===== FOOTER ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 44px 0 24px;
            margin-top: auto;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-bottom: 28px;
        }

        .site-footer h4 {
            font-family: var(--font-heading);
            font-size: 1rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .site-footer p {
            font-size: 0.85rem;
            line-height: 1.65;
        }

        .site-footer ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .site-footer ul li {
            font-size: 0.85rem;
        }

        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.65);
            transition: color var(--transition-fast);
        }

        .site-footer ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 18px;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
            letter-spacing: 0.03em;
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1100px) {
            .activity-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .two-col {
                grid-template-columns: 1fr 280px;
                gap: 20px;
            }
        }

        @media (max-width: 900px) {
            .sidebar {
                transform: translateX(-100%);
                width: 260px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.active {
                display: block;
            }
            .mobile-header {
                display: flex;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .page-banner {
                padding: 40px 24px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .two-col {
                grid-template-columns: 1fr;
            }
            .activity-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 40px 0;
            }
            .cta-section {
                padding: 36px 24px;
            }
            .cta-subscribe-form {
                flex-direction: column;
                max-width: 100%;
            }
            .btn-subscribe {
                width: 100%;
                text-align: center;
            }
            .banner-stats-row {
                gap: 20px;
            }
            .site-footer .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }

        @media (max-width: 600px) {
            .activity-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .banner-desc {
                font-size: 0.9rem;
            }
            .banner-stats-row {
                gap: 14px;
            }
            .banner-stat-num {
                font-size: 1.5rem;
            }
            .filter-tags-wrapper {
                gap: 6px;
            }
            .filter-tag {
                padding: 7px 13px;
                font-size: 0.78rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .timeline-date-badge {
                width: 56px;
                height: 56px;
            }
            .timeline-date-badge .date-day {
                font-size: 1.2rem;
            }
            .timeline-item {
                gap: 14px;
                padding: 16px 0;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .cta-section h3 {
                font-size: 1.3rem;
            }
            .hot-section {
                padding: 20px 16px;
            }
            .activity-card-body {
                padding: 14px 14px 10px;
            }
            .activity-card-footer {
                padding: 10px 14px 14px;
            }
            .activity-card-title {
                font-size: 0.95rem;
            }
        }

        @media (max-width: 400px) {
            .page-banner {
                padding: 28px 16px;
            }
            .page-banner h1 {
                font-size: 1.3rem;
            }
            .banner-stats-row {
                flex-direction: column;
                gap: 8px;
            }
            .filter-tag {
                padding: 6px 10px;
                font-size: 0.72rem;
                border-radius: 18px;
            }
        }

        /* Utility: visually hidden for screen readers */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            margin: -1px;
            padding: 0;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }