/* roulang page: index */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --primary-50: #eff6ff;
            --primary-100: #dbeafe;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-width: 260px;
            --nav-bg: #0f172a;
            --nav-text: #cbd5e1;
            --nav-active: #3b82f6;
        }
        *,
        *::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: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            background: var(--bg-body);
            color: var(--text-body);
            line-height: 1.6;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container-main {
                padding: 0 16px;
            }
        }

        /* 左侧导航 */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--nav-bg);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            overflow-y: auto;
            overflow-x: hidden;
        }
        .app-nav .logo-area {
            padding: 28px 20px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .app-nav .logo-area .logo-text {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .app-nav .logo-area .logo-text i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .app-nav .nav-links {
            padding: 20px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .app-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--nav-text);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .app-nav .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            flex-shrink: 0;
        }
        .app-nav .nav-links a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        .app-nav .nav-links a.active {
            background: rgba(59, 130, 246, 0.15);
            color: #fff;
            font-weight: 600;
        }
        .app-nav .nav-links a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 24px;
            border-radius: 0 4px 4px 0;
            background: var(--nav-active);
        }
        .app-nav .nav-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: var(--text-light);
            text-align: center;
        }
        .app-nav .nav-footer span {
            opacity: 0.6;
        }

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

        /* 移动端顶部栏 */
        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background: var(--nav-bg);
            padding: 12px 16px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-topbar .logo-text {
            color: #fff;
            font-size: 1.1rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-topbar .logo-text i {
            color: var(--accent);
        }
        .mobile-topbar .menu-btn {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .mobile-topbar .menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* 移动端遮罩 */
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .nav-overlay.show {
            opacity: 1;
        }

        /* 板块 */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .subtitle {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-50);
            padding: 4px 16px;
            border-radius: 20px;
            letter-spacing: 0.3px;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-body);
            margin-bottom: 12px;
        }
        .section-header p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
        }

        /* Hero */
        .hero-section {
            padding: 100px 0 80px;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #1e40af 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -40%;
            left: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-section .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-section .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 6px 18px 6px 14px;
            border-radius: 24px;
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 28px;
        }
        .hero-section .status-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #22c55e;
            display: inline-block;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.6;
                transform: scale(1.2);
            }
        }
        .hero-section h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-section h1 .highlight {
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-section .hero-desc {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-section .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-section .hero-actions .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #0f172a;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .hero-section .hero-actions .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
        }
        .hero-section .hero-actions .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            font-weight: 500;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.2);
            cursor: pointer;
        }
        .hero-section .hero-actions .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0 50px;
            }
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section .hero-desc {
                font-size: 1rem;
            }
            .hero-section .hero-actions .btn-primary,
            .hero-section .hero-actions .btn-secondary {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }

        /* 数据卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: -40px;
            position: relative;
            z-index: 3;
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            text-align: center;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.15);
        }
        .stat-card .stat-icon {
            font-size: 2rem;
            color: var(--primary-light);
            margin-bottom: 12px;
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-body);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 4px;
        }
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
                margin-top: -30px;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
                margin-top: -20px;
            }
            .stat-card {
                padding: 20px 16px;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
        }

        /* 特色卡片 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--primary-100);
        }
        .feature-card .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: #fff;
        }
        .feature-card .feature-icon.blue {
            background: linear-gradient(135deg, #3b82f6, #1e40af);
        }
        .feature-card .feature-icon.amber {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }
        .feature-card .feature-icon.green {
            background: linear-gradient(135deg, #10b981, #059669);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-body);
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .feature-card {
                padding: 24px 20px;
            }
        }

        /* 分类入口卡片 */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        .category-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            border-radius: 0 0 var(--radius) var(--radius);
            transition: var(--transition);
        }
        .category-card:hover::after {
            height: 6px;
        }
        .category-card:nth-child(1)::after {
            background: linear-gradient(90deg, #3b82f6, #1e40af);
        }
        .category-card:nth-child(2)::after {
            background: linear-gradient(90deg, #f59e0b, #d97706);
        }
        .category-card:nth-child(3)::after {
            background: linear-gradient(90deg, #10b981, #059669);
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .cat-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.6rem;
            color: #fff;
        }
        .category-card:nth-child(1) .cat-icon {
            background: linear-gradient(135deg, #3b82f6, #1e40af);
        }
        .category-card:nth-child(2) .cat-icon {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }
        .category-card:nth-child(3) .cat-icon {
            background: linear-gradient(135deg, #10b981, #059669);
        }
        .category-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-body);
        }
        .category-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .category-card .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .category-card:hover .cat-link {
            gap: 10px;
            color: var(--primary-dark);
        }
        @media (max-width: 1024px) {
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .categories-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* 资讯列表 */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            display: flex;
            align-items: flex-start;
            gap: 20px;
        }
        .news-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-100);
            transform: translateX(4px);
        }
        .news-item .news-tag {
            flex-shrink: 0;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 12px;
            background: var(--primary-50);
            color: var(--primary);
            margin-top: 2px;
        }
        .news-item .news-body {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-body);
            margin-bottom: 4px;
            transition: var(--transition);
        }
        .news-item:hover .news-body h4 {
            color: var(--primary);
        }
        .news-item .news-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-item .news-time {
            flex-shrink: 0;
            color: var(--text-light);
            font-size: 0.8rem;
            white-space: nowrap;
            margin-top: 2px;
        }
        .news-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px dashed var(--border-color);
        }
        @media (max-width: 640px) {
            .news-item {
                flex-direction: column;
                padding: 16px 18px;
                gap: 8px;
            }
            .news-item .news-time {
                align-self: flex-end;
            }
        }

        /* 流程步骤 */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 12.5%;
            right: 12.5%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary-100), var(--primary-light), var(--primary-100));
            z-index: 0;
        }
        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-card);
            padding: 32px 20px 24px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            color: #fff;
            font-size: 1.2rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-body);
        }
        .step-card p {
            color: var(--text-muted);
            font-size: 0.85rem;
            line-height: 1.6;
        }
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .steps-grid::before {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .step-card {
                padding: 20px 14px;
            }
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-100);
        }
        .faq-item .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-body);
            transition: var(--transition);
            user-select: none;
            gap: 12px;
        }
        .faq-item .faq-question:hover {
            color: var(--primary);
        }
        .faq-item .faq-question i {
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 24px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 18px;
        }
        .faq-item .faq-answer p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        @media (max-width: 640px) {
            .faq-item .faq-question {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-item.active .faq-answer {
                padding: 0 16px 14px;
            }
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60%;
            left: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            max-width: 500px;
            margin: 0 auto 32px;
        }
        .cta-section .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .cta-section .cta-actions .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #0f172a;
            font-weight: 700;
            padding: 16px 40px;
            border-radius: var(--radius-sm);
            font-size: 1.05rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .cta-section .cta-actions .btn-cta:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(245, 158, 11, 0.35);
        }
        .cta-section .cta-actions .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            font-weight: 500;
            padding: 16px 36px;
            border-radius: var(--radius-sm);
            font-size: 1.05rem;
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: var(--transition);
            cursor: pointer;
        }
        .cta-section .cta-actions .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
        }
        @media (max-width: 640px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-section .cta-actions .btn-cta,
            .cta-section .cta-actions .btn-outline {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            padding: 40px 0 24px;
            color: rgba(255, 255, 255, 0.6);
        }
        .site-footer .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: flex-start;
            gap: 32px;
        }
        .site-footer .footer-brand .logo-text {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 8px;
        }
        .site-footer .footer-brand .logo-text i {
            color: var(--accent);
        }
        .site-footer .footer-brand p {
            font-size: 0.85rem;
            max-width: 280px;
            line-height: 1.6;
        }
        .site-footer .footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
        }
        .site-footer .footer-links .link-group h5 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .site-footer .footer-links .link-group a {
            display: block;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            padding: 4px 0;
            transition: var(--transition);
        }
        .site-footer .footer-links .link-group a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
        }
        .site-footer .footer-bottom span {
            opacity: 0.7;
        }
        @media (max-width: 768px) {
            .site-footer .footer-inner {
                flex-direction: column;
                gap: 24px;
            }
            .site-footer .footer-links {
                gap: 32px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* 响应式导航 */
        @media (max-width: 1024px) {
            .app-nav {
                transform: translateX(-100%);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .mobile-topbar {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .nav-overlay.show {
                display: block;
            }
        }
        @media (min-width: 1025px) {
            .nav-overlay {
                display: none !important;
            }
        }

        /* 通用工具 */
        .text-gradient {
            background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .bg-soft-primary {
            background: var(--primary-50);
        }

        /* 滚动条美化 */
        .app-nav::-webkit-scrollbar {
            width: 4px;
        }
        .app-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .app-nav::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }
        .app-nav::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

        /* 小屏适配 */
        @media (max-width: 480px) {
            .hero-section h1 {
                font-size: 1.7rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stat-card .stat-number {
                font-size: 1.4rem;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0ea5e9;
            --secondary-dark: #0284c7;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-nav: #0f172a;
            --bg-nav-hover: #1e293b;
            --bg-nav-active: #1e3a5f;
            --text-dark: #0f172a;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-focus: #3b82f6;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.18);
            --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --nav-width: 240px;
            --nav-collapsed: 72px;
            --header-height: 0px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }
        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, select, textarea { font-family: inherit; font-size: inherit; outline: none; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: var(--text-dark); font-weight: 700; }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 0.75rem; }
        .container-main { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }

        /* ===== Left App Shell Navigation ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--bg-nav);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition), width var(--transition);
            box-shadow: 2px 0 20px rgba(0,0,0,0.2);
        }
        .app-nav .logo-area {
            padding: 24px 20px 16px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .app-nav .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }
        .app-nav .logo-text i { font-size: 1.6rem; color: var(--primary-light); }
        .app-nav .nav-links {
            flex: 1;
            padding: 12px 12px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .app-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            position: relative;
        }
        .app-nav .nav-links a i { width: 22px; font-size: 1.15rem; text-align: center; }
        .app-nav .nav-links a:hover {
            background: var(--bg-nav-hover);
            color: #fff;
        }
        .app-nav .nav-links a.active {
            background: var(--bg-nav-active);
            color: #fff;
            box-shadow: inset 4px 0 0 var(--primary-light);
        }
        .app-nav .nav-links a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--primary-light);
            border-radius: 0 4px 4px 0;
        }
        .app-nav .nav-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.75rem;
            color: var(--text-light);
            text-align: center;
        }

        /* ===== Main Content Area ===== */
        .main-wrapper {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            width: calc(100% - var(--nav-width));
        }
        .main-content { flex: 1; padding: 32px 0 60px; }

        /* ===== Mobile Nav Toggle ===== */
        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-nav);
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.45);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-nav);
            color: var(--text-light);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .site-footer .footer-inner {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: space-between;
        }
        .site-footer .footer-brand { flex: 1 1 260px; }
        .site-footer .footer-brand .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .site-footer .footer-brand .logo-text i { color: var(--primary-light); font-size: 1.5rem; }
        .site-footer .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: var(--text-light); }
        .site-footer .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }
        .site-footer .link-group { min-width: 120px; }
        .site-footer .link-group h5 {
            font-size: 0.85rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .site-footer .link-group a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-light);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .site-footer .link-group a:hover { color: var(--primary-light); }
        .site-footer .footer-bottom {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* ===== Hero Section ===== */
        .hero-guide {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 60%, #1a4a7a 100%);
            padding: 60px 0 70px;
            position: relative;
            overflow: hidden;
        }
        .hero-guide::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(37,99,235,0.2) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-guide .hero-content { position: relative; z-index: 2; }
        .hero-guide h1 {
            color: #fff;
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }
        .hero-guide h1 i { color: var(--primary-light); margin-right: 8px; }
        .hero-guide p {
            color: rgba(255,255,255,0.8);
            font-size: 1.15rem;
            max-width: 620px;
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .hero-guide .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .hero-guide .hero-badges .badge {
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .hero-guide .hero-badges .badge i { color: var(--primary-light); }

        /* ===== Section Common ===== */
        .section-guide { padding: 56px 0; }
        .section-guide .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .section-guide .section-sub {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin-bottom: 36px;
            max-width: 640px;
        }
        .section-guide .section-title i { color: var(--primary); margin-right: 8px; }

        /* ===== Cards ===== */
        .card-method {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            height: 100%;
        }
        .card-method:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .card-method .icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: #fff;
            margin-bottom: 18px;
        }
        .card-method h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .card-method p { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; }

        /* ===== Steps ===== */
        .step-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border);
        }
        .step-item:last-child { border-bottom: none; }
        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .step-content h4 { font-size: 1.05rem; margin-bottom: 4px; }
        .step-content p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Safety Tips ===== */
        .tip-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px;
            border-left: 4px solid var(--primary);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
            height: 100%;
        }
        .tip-card:hover { box-shadow: var(--shadow); }
        .tip-card .tip-icon { font-size: 1.8rem; color: var(--primary); margin-bottom: 12px; }
        .tip-card h4 { font-size: 1rem; margin-bottom: 6px; }
        .tip-card p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            padding: 0;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-dark);
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--primary-bg); }
        .faq-question i { transition: transform var(--transition); color: var(--primary); font-size: 0.85rem; }
        .faq-question.open i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 22px;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
            background: #fafcff;
        }
        .faq-answer.open { max-height: 400px; padding: 0 22px 18px; }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            box-shadow: var(--shadow-lg);
        }
        .cta-block h2 { color: #fff; font-size: 1.9rem; margin-bottom: 12px; }
        .cta-block p { color: rgba(255,255,255,0.85); max-width: 520px; margin: 0 auto 24px; font-size: 1.05rem; }
        .cta-block .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            color: var(--primary);
            padding: 14px 40px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0,0,0,0.15);
        }
        .cta-block .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.25);
            color: var(--primary-dark);
        }

        /* ===== Related Articles ===== */
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            height: 100%;
        }
        .article-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-3px);
            border-color: var(--primary-light);
        }
        .article-card .art-tag {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .article-card h4 { font-size: 1.05rem; margin-bottom: 8px; }
        .article-card p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 12px; }
        .article-card .art-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-card .art-link i { transition: transform var(--transition); }
        .article-card .art-link:hover i { transform: translateX(4px); }

        /* ===== Buttons & Badges ===== */
        .btn-outline-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 50px;
            border: 2px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            background: transparent;
        }
        .btn-outline-primary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(37,99,235,0.3);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-guide h1 { font-size: 2.2rem; }
            .section-guide .section-title { font-size: 1.6rem; }
            .cta-block { padding: 36px 28px; }
            .cta-block h2 { font-size: 1.5rem; }
        }

        @media (max-width: 768px) {
            :root { --nav-width: 0px; }
            .app-nav {
                transform: translateX(-100%);
                width: 280px;
            }
            .app-nav.open { transform: translateX(0); }
            .mobile-nav-toggle { display: flex; }
            .mobile-nav-overlay.open { display: block; }
            .main-wrapper { margin-left: 0; width: 100%; }
            .main-content { padding: 24px 0 40px; }
            .hero-guide { padding: 40px 0 50px; }
            .hero-guide h1 { font-size: 1.8rem; }
            .hero-guide p { font-size: 1rem; }
            .section-guide { padding: 36px 0; }
            .section-guide .section-title { font-size: 1.4rem; }
            .section-guide .section-sub { font-size: 0.95rem; }
            .site-footer .footer-inner { flex-direction: column; gap: 28px; }
            .site-footer .footer-links { gap: 24px; }
            .site-footer .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
            .cta-block { padding: 28px 20px; }
            .cta-block h2 { font-size: 1.3rem; }
            .cta-block .btn-cta { padding: 12px 28px; font-size: 0.95rem; }
            .step-item { gap: 14px; }
            .step-number { width: 36px; height: 36px; font-size: 0.95rem; }
            .hero-guide .hero-badges .badge { font-size: 0.78rem; padding: 6px 14px; }
        }

        @media (max-width: 520px) {
            .container-main { padding: 0 16px; }
            .hero-guide h1 { font-size: 1.5rem; }
            .hero-guide p { font-size: 0.92rem; }
            .section-guide .section-title { font-size: 1.2rem; }
            .card-method { padding: 20px 16px; }
            .card-method .icon-wrap { width: 44px; height: 44px; font-size: 1.3rem; }
            .faq-question { font-size: 0.92rem; padding: 14px 16px; }
            .faq-answer { font-size: 0.85rem; }
            .cta-block h2 { font-size: 1.1rem; }
            .cta-block p { font-size: 0.92rem; }
            .article-card { padding: 18px; }
            .site-footer { padding: 32px 0 16px; }
        }

        /* ===== Accessibility ===== */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 3px solid var(--border-focus);
            outline-offset: 2px;
        }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up { animation: fadeUp 0.6s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        .delay-4 { animation-delay: 0.4s; }

/* roulang page: article */
:root {
            --nav-width: 240px;
            --nav-collapsed: 0px;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-primary: #4f46e5;
            --color-primary-light: #818cf8;
            --color-primary-dark: #3730a3;
            --color-accent: #06b6d4;
            --color-text: #1e293b;
            --color-text-secondary: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.16);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            display: flex;
            min-height: 100vh;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--color-border-light);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--color-text-muted);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--color-text-secondary);
        }

        /* ===== App Shell ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--color-surface);
            border-right: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .app-nav .logo-area {
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--color-border-light);
        }

        .app-nav .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.3px;
        }

        .app-nav .logo-text i {
            font-size: 1.5rem;
            color: var(--color-primary);
        }

        .app-nav .nav-links {
            flex: 1;
            padding: 12px 12px;
            display: flex;
            flex-direction: column;
            gap: 2px;
            overflow-y: auto;
        }

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

        .app-nav .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: var(--color-text-muted);
            transition: color var(--transition);
        }

        .app-nav .nav-links a:hover {
            background: var(--color-border-light);
            color: var(--color-text);
        }

        .app-nav .nav-links a:hover i {
            color: var(--color-primary);
        }

        .app-nav .nav-links a.active {
            background: var(--color-primary);
            color: #ffffff;
            box-shadow: var(--shadow-md);
        }

        .app-nav .nav-links a.active i {
            color: #ffffff;
        }

        .app-nav .nav-links a.active::after {
            content: '';
            position: absolute;
            right: -1px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--color-primary-dark);
            border-radius: 4px 0 0 4px;
        }

        .app-nav .nav-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--color-border-light);
            font-size: 0.75rem;
            color: var(--color-text-muted);
            text-align: center;
        }

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

        .container-main {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }

        /* ===== Article Page ===== */
        .article-header {
            padding: 48px 0 32px;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border-light);
        }

        .article-header .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .article-header .breadcrumb a {
            color: var(--color-text-secondary);
            transition: color var(--transition);
        }

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

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

        .article-header .breadcrumb .current {
            color: var(--color-text);
            font-weight: 500;
        }

        .article-header h1 {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.5px;
            color: var(--color-text);
            margin-bottom: 16px;
        }

        .article-header .meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--color-text-secondary);
        }

        .article-header .meta .badge-category {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--color-primary);
            color: #fff;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .article-header .meta .badge-category i {
            font-size: 0.7rem;
        }

        .article-header .meta .date {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-header .meta .date i {
            color: var(--color-text-muted);
        }

        /* ===== Article Body ===== */
        .article-body-wrap {
            padding: 40px 0 48px;
            background: var(--color-surface);
        }

        .article-body {
            max-width: 820px;
            margin: 0 auto;
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
        }

        .article-body p {
            margin-bottom: 1.4em;
        }

        .article-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-top: 2em;
            margin-bottom: 0.7em;
            color: var(--color-text);
            letter-spacing: -0.3px;
        }

        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-top: 1.6em;
            margin-bottom: 0.5em;
            color: var(--color-text);
        }

        .article-body ul,
        .article-body ol {
            margin-bottom: 1.4em;
            padding-left: 1.6em;
        }

        .article-body ul li {
            list-style: disc;
            margin-bottom: 0.4em;
        }

        .article-body ol li {
            list-style: decimal;
            margin-bottom: 0.4em;
        }

        .article-body blockquote {
            border-left: 4px solid var(--color-primary);
            padding: 12px 20px;
            margin: 1.4em 0;
            background: var(--color-border-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-secondary);
            font-style: italic;
        }

        .article-body code {
            background: var(--color-border-light);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            font-family: 'JetBrains Mono', monospace;
        }

        .article-body pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.4em 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-body pre code {
            background: none;
            padding: 0;
            color: inherit;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.6em 0;
            box-shadow: var(--shadow-md);
        }

        .article-body a {
            color: var(--color-primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

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

        /* ===== Tags ===== */
        .article-tags {
            padding: 24px 0 16px;
            border-top: 1px solid var(--color-border-light);
            margin-top: 32px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .article-tags .tag-label {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        .article-tags .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--color-border-light);
            color: var(--color-text-secondary);
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition);
        }

        .article-tags .tag:hover {
            background: var(--color-primary);
            color: #ffffff;
        }

        /* ===== Share ===== */
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px 0 8px;
            border-top: 1px solid var(--color-border-light);
            margin-top: 8px;
        }

        .article-share .share-label {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        .article-share .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-border-light);
            color: var(--color-text-secondary);
            font-size: 0.95rem;
            transition: all var(--transition);
        }

        .article-share .share-btn:hover {
            background: var(--color-primary);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* ===== Not Found ===== */
        .not-found-wrap {
            padding: 80px 0;
            text-align: center;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }

        .not-found-wrap .nf-icon {
            font-size: 3.5rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }

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

        .not-found-wrap p {
            color: var(--color-text-secondary);
            max-width: 480px;
            margin: 0 auto 24px;
        }

        .not-found-wrap .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            background: var(--color-primary);
            color: #fff;
            font-weight: 600;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .not-found-wrap .btn-back:hover {
            background: var(--color-primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== Related ===== */
        .related-section {
            padding: 48px 0 56px;
            background: var(--color-bg);
        }

        .related-section .section-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 28px;
            color: var(--color-text);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .related-section .section-title i {
            color: var(--color-primary);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }

        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            padding: 20px 22px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

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

        .related-card .rc-cat {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }

        .related-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 8px;
            color: var(--color-text);
            flex: 1;
        }

        .related-card h3 a {
            color: inherit;
            transition: color var(--transition);
        }

        .related-card h3 a:hover {
            color: var(--color-primary);
        }

        .related-card .rc-meta {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .related-card .rc-meta i {
            font-size: 0.7rem;
        }

        /* ===== CTA ===== */
        .article-cta {
            padding: 48px 0 56px;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            color: #ffffff;
        }

        .article-cta .cta-inner {
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }

        .article-cta h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }

        .article-cta p {
            font-size: 1.05rem;
            opacity: 0.9;
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .article-cta .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: var(--radius-md);
            background: #ffffff;
            color: var(--color-primary);
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-lg);
        }

        .article-cta .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-xl);
            background: #f8fafc;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .site-footer .footer-inner {
            display: grid;
            grid-template-columns: 1.2fr 2fr;
            gap: 48px;
            padding-bottom: 28px;
            border-bottom: 1px solid var(--color-border-light);
        }

        .site-footer .footer-brand .logo-text {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 12px;
        }

        .site-footer .footer-brand .logo-text i {
            font-size: 1.3rem;
        }

        .site-footer .footer-brand p {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            max-width: 300px;
            line-height: 1.6;
        }

        .site-footer .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .site-footer .footer-links .link-group h5 {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        .site-footer .footer-links .link-group a {
            display: block;
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            padding: 4px 0;
            transition: color var(--transition);
        }

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

        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Mobile Toggle ===== */
        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 12px;
            left: 12px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-md);
            background: var(--color-surface);
            box-shadow: var(--shadow-md);
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--color-text);
            cursor: pointer;
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }

        .mobile-nav-toggle:hover {
            background: var(--color-border-light);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity var(--transition);
        }

        .mobile-overlay.open {
            opacity: 1;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .container-main {
                padding: 0 24px;
            }

            .article-header h1 {
                font-size: 1.8rem;
            }

            .site-footer .footer-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .site-footer .footer-links {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-width: 0px;
            }

            .mobile-nav-toggle {
                display: flex;
            }

            .app-nav {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-xl);
            }

            .app-nav.open {
                transform: translateX(0);
            }

            .mobile-overlay {
                display: block;
                pointer-events: none;
            }

            .mobile-overlay.open {
                pointer-events: auto;
            }

            .main-content {
                margin-left: 0;
                padding-top: 0;
            }

            .container-main {
                padding: 0 16px;
            }

            .article-header {
                padding: 32px 0 24px;
            }

            .article-header h1 {
                font-size: 1.5rem;
            }

            .article-header .meta {
                gap: 12px;
                font-size: 0.8rem;
            }

            .article-body {
                font-size: 0.98rem;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .site-footer .footer-links {
                grid-template-columns: 1fr 1fr;
            }

            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .article-cta h2 {
                font-size: 1.4rem;
            }

            .article-cta p {
                font-size: 0.95rem;
            }

            .article-cta .btn-cta {
                padding: 12px 28px;
                font-size: 0.95rem;
            }

            .not-found-wrap {
                padding: 48px 20px;
            }

            .not-found-wrap .nf-icon {
                font-size: 2.5rem;
            }

            .not-found-wrap h2 {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .article-header h1 {
                font-size: 1.3rem;
            }

            .article-header .meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .article-body {
                font-size: 0.92rem;
            }

            .article-tags .tag {
                font-size: 0.75rem;
                padding: 3px 10px;
            }

            .related-card {
                padding: 16px 18px;
            }

            .site-footer .footer-links {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .site-footer .footer-brand .logo-text {
                font-size: 1.1rem;
            }

            .article-cta h2 {
                font-size: 1.2rem;
            }

            .article-cta .btn-cta {
                padding: 10px 22px;
                font-size: 0.9rem;
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        .share-btn:focus-visible,
        .tag:focus-visible,
        .btn-back:focus-visible,
        .btn-cta:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        /* ===== Skip link ===== */
        .skip-link {
            position: absolute;
            top: -100%;
            left: 50%;
            transform: translateX(-50%);
            background: var(--color-primary);
            color: #fff;
            padding: 8px 20px;
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
            z-index: 9999;
            font-weight: 600;
            transition: top 0.2s;
        }

        .skip-link:focus {
            top: 0;
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --sidebar-width: 240px;
            --sidebar-collapsed: 68px;
            --header-height: 0px;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            background: #f8fafc;
            color: #0f172a;
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== App Shell Layout ===== */
        .app-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Sidebar Navigation ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: #ffffff;
            border-right: 1px solid #e9edf4;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: width var(--transition), transform var(--transition);
            overflow: hidden;
        }
        .app-nav .logo-area {
            padding: 24px 20px 16px;
            border-bottom: 1px solid #f1f4f9;
            flex-shrink: 0;
        }
        .app-nav .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            color: #1e1b4b;
            letter-spacing: -0.3px;
        }
        .app-nav .logo-text i {
            font-size: 24px;
            color: #4f46e5;
        }
        .app-nav .nav-links {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 2px;
            overflow-y: auto;
        }
        .app-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: #475569;
            transition: var(--transition);
            position: relative;
        }
        .app-nav .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: #94a3b8;
            transition: var(--transition);
        }
        .app-nav .nav-links a:hover {
            background: #f1f4f9;
            color: #1e1b4b;
        }
        .app-nav .nav-links a:hover i {
            color: #4f46e5;
        }
        .app-nav .nav-links a.active {
            background: #eef2ff;
            color: #4338ca;
            font-weight: 600;
        }
        .app-nav .nav-links a.active i {
            color: #4f46e5;
        }
        .app-nav .nav-links a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: #4f46e5;
            border-radius: 0 4px 4px 0;
        }
        .app-nav .nav-footer {
            padding: 16px 20px;
            border-top: 1px solid #f1f4f9;
            font-size: 12px;
            color: #94a3b8;
            flex-shrink: 0;
            text-align: center;
        }

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

        /* ===== Container ===== */
        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* ===== Page Header ===== */
        .page-header {
            padding: 48px 0 32px;
            background: linear-gradient(135deg, #eef2ff 0%, #f8fafc 100%);
            border-bottom: 1px solid #e9edf4;
        }
        .page-header h1 {
            font-size: 36px;
            font-weight: 800;
            color: #1e1b4b;
            letter-spacing: -0.5px;
            line-height: 1.2;
        }
        .page-header p {
            font-size: 17px;
            color: #475569;
            max-width: 640px;
            margin-top: 12px;
            line-height: 1.7;
        }

        /* ===== Section ===== */
        .section-block {
            padding: 64px 0;
        }
        .section-block+.section-block {
            border-top: 1px solid #f1f4f9;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: #4f46e5;
            background: #eef2ff;
            padding: 4px 14px;
            border-radius: 20px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 30px;
            font-weight: 700;
            color: #0f172a;
            letter-spacing: -0.3px;
            line-height: 1.25;
        }
        .section-sub {
            font-size: 16px;
            color: #64748b;
            max-width: 600px;
            margin-top: 10px;
            line-height: 1.7;
        }

        /* ===== Cards ===== */
        .card-base {
            background: #ffffff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card, 0 4px 20px rgba(0, 0, 0, 0.04));
            border: 1px solid #f1f4f9;
            transition: var(--transition);
        }
        .card-base:hover {
            box-shadow: 0 12px 36px -8px rgba(0, 0, 0, 0.06);
            transform: translateY(-2px);
            border-color: #e2e8f0;
        }

        /* ===== Feature Grid ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid #f1f4f9;
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: 0 12px 36px -8px rgba(0, 0, 0, 0.06);
            transform: translateY(-3px);
            border-color: #e2e8f0;
        }
        .feature-card .icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 16px;
            background: #eef2ff;
            color: #4f46e5;
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: #64748b;
            line-height: 1.7;
        }
        .feature-card .badge-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 500;
            color: #4f46e5;
            background: #eef2ff;
            padding: 2px 10px;
            border-radius: 12px;
            margin-top: 12px;
        }

        /* ===== Stats Row ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-item {
            text-align: center;
            padding: 24px 16px;
            background: #ffffff;
            border-radius: var(--radius-md);
            border: 1px solid #f1f4f9;
        }
        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: #1e1b4b;
            letter-spacing: -1px;
            line-height: 1;
        }
        .stat-number .unit {
            font-size: 18px;
            font-weight: 600;
            color: #4f46e5;
            margin-left: 2px;
        }
        .stat-label {
            font-size: 14px;
            color: #64748b;
            margin-top: 6px;
        }

        /* ===== Service Flow ===== */
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .flow-step {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 28px 20px;
            border: 1px solid #f1f4f9;
            text-align: center;
            position: relative;
            counter-increment: step;
        }
        .flow-step .step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #eef2ff;
            color: #4f46e5;
            font-weight: 700;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
        }
        .flow-step h4 {
            font-size: 16px;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 6px;
        }
        .flow-step p {
            font-size: 13px;
            color: #64748b;
            line-height: 1.6;
        }
        .flow-step::after {
            content: '';
            position: absolute;
            top: 44px;
            right: -14px;
            width: 24px;
            height: 2px;
            background: #e2e8f0;
            display: none;
        }
        .flow-step:not(:last-child)::after {
            display: block;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid #f1f4f9;
            padding: 20px 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-size: 17px;
            font-weight: 600;
            color: #0f172a;
            padding: 4px 0;
            user-select: none;
        }
        .faq-question i {
            color: #94a3b8;
            transition: var(--transition);
            font-size: 14px;
        }
        .faq-question.open i {
            transform: rotate(180deg);
            color: #4f46e5;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0;
            color: #475569;
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding-top: 12px;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            color: #ffffff;
        }
        .cta-block h2 {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.3px;
        }
        .cta-block p {
            font-size: 16px;
            color: #c7d2fe;
            margin-top: 12px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #ffffff;
            color: #1e1b4b;
            font-weight: 600;
            font-size: 16px;
            padding: 14px 32px;
            border-radius: 50px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: #eef2ff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #ffffff;
            font-weight: 500;
            font-size: 16px;
            padding: 14px 32px;
            border-radius: 50px;
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-2px);
        }

        /* ===== Footer (共享结构) ===== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .site-footer .footer-inner {
            display: grid;
            grid-template-columns: 1.2fr 2fr;
            gap: 48px;
            padding-bottom: 32px;
            border-bottom: 1px solid #1e293b;
        }
        .site-footer .footer-brand .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: #ffffff;
        }
        .site-footer .footer-brand .logo-text i {
            color: #818cf8;
            font-size: 26px;
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            color: #94a3b8;
            margin-top: 12px;
            max-width: 300px;
            line-height: 1.7;
        }
        .site-footer .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .site-footer .link-group h5 {
            font-size: 14px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .site-footer .link-group a {
            display: block;
            font-size: 14px;
            color: #94a3b8;
            padding: 4px 0;
            transition: var(--transition);
        }
        .site-footer .link-group a:hover {
            color: #ffffff;
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            font-size: 13px;
            color: #64748b;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Mobile Toggle ===== */
        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            background: #ffffff;
            border: 1px solid #e2e8f0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #1e1b4b;
            cursor: pointer;
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: #f1f4f9;
        }

        /* ===== Overlay ===== */
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.3);
            z-index: 999;
            backdrop-filter: blur(2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-step::after {
                display: none !important;
            }
            .site-footer .footer-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .site-footer .footer-links {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            .app-nav {
                transform: translateX(-100%);
                width: 280px;
                border-right: none;
                box-shadow: 4px 0 40px rgba(0, 0, 0, 0.08);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .nav-overlay.open {
                display: block;
            }
            .mobile-toggle {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .container-main {
                padding: 0 20px;
            }
            .page-header h1 {
                font-size: 28px;
            }
            .page-header {
                padding: 32px 0 24px;
            }
            .section-block {
                padding: 40px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
            .flow-steps {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .cta-block {
                padding: 36px 24px;
            }
            .cta-block h2 {
                font-size: 24px;
            }
            .btn-primary,
            .btn-outline-light {
                padding: 12px 24px;
                font-size: 15px;
            }
            .site-footer .footer-links {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .flow-steps {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-links {
                grid-template-columns: 1fr;
            }
            .page-header h1 {
                font-size: 24px;
            }
            .section-title {
                font-size: 21px;
            }
            .container-main {
                padding: 0 16px;
            }
            .cta-btn-group {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary,
            .btn-outline-light {
                justify-content: center;
            }
        }

        /* ===== Smooth toggle for FAQ (pure CSS fallback via JS) ===== */
        .faq-answer.open {
            max-height: 300px;
            padding-top: 12px;
        }

        /* ===== Skeleton / Loading fade ===== */
        .fade-in {
            animation: fadeIn 0.5s ease forwards;
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-delay-1 {
            animation-delay: 0.1s;
        }
        .fade-in-delay-2 {
            animation-delay: 0.2s;
        }
        .fade-in-delay-3 {
            animation-delay: 0.3s;
        }
        .fade-in-delay-4 {
            animation-delay: 0.4s;
        }

/* roulang page: category3 */
:root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-dark: #020617;
            --accent: #3b82f6;
            --accent-light: #60a5fa;
            --accent-dark: #2563eb;
            --accent-glow: rgba(59, 130, 246, 0.3);
            --safe: #10b981;
            --safe-light: #34d399;
            --warning: #f59e0b;
            --danger: #ef4444;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-card: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --sidebar-width: 240px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            display: flex;
            min-height: 100vh;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }

        .app-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== 左侧导航 ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-dark);
            color: var(--text-inverse);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
            overflow-y: auto;
        }

        .app-nav::-webkit-scrollbar {
            width: 4px;
        }
        .app-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .app-nav::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }

        .logo-area {
            padding: 28px 20px 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            flex-shrink: 0;
        }

        .logo-text {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.3px;
        }
        .logo-text i {
            font-size: 24px;
            color: var(--accent);
            filter: drop-shadow(0 0 8px var(--accent-glow));
        }

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

        .nav-links 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, 0.65);
            transition: var(--transition);
            position: relative;
        }

        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }

        .nav-links a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }

        .nav-links a.active {
            color: #fff;
            background: rgba(59, 130, 246, 0.2);
            box-shadow: inset 3px 0 0 var(--accent);
        }

        .nav-links a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }

        .nav-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.35);
            flex-shrink: 0;
            text-align: center;
        }

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

        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: var(--bg-dark);
            color: #fff;
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .mobile-header .logo-text {
            font-size: 18px;
        }

        .mobile-menu-btn {
            background: none;
            border: none;
            color: #fff;
            font-size: 22px;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: var(--transition);
        }

        .mobile-menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            z-index: 998;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .mobile-overlay.open {
            opacity: 1;
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            padding: 80px 0 64px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(59, 130, 246, 0.15);
            border: 1px solid rgba(59, 130, 246, 0.25);
            color: var(--accent-light);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }

        .hero-badge i {
            font-size: 14px;
        }

        .hero-section h1 {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }

        .hero-section h1 span {
            background: linear-gradient(135deg, var(--accent-light), #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 640px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            flex-wrap: wrap;
            margin-top: 16px;
        }

        .hero-stat-item {
            text-align: center;
        }

        .hero-stat-item .num {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
        }

        .hero-stat-item .num span {
            color: var(--accent-light);
        }

        .hero-stat-item .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 4px;
        }

        /* ===== 板块通用 ===== */
        .section-block {
            padding: 72px 0;
        }

        .section-block.alt-bg {
            background: #f1f5f9;
        }

        .section-block.dark-bg {
            background: var(--bg-dark);
            color: var(--text-inverse);
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-title h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }

        .section-title p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .dark-bg .section-title h2 {
            color: #fff;
        }
        .dark-bg .section-title p {
            color: rgba(255, 255, 255, 0.6);
        }

        .section-title .title-tag {
            display: inline-block;
            background: rgba(59, 130, 246, 0.1);
            color: var(--accent);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        /* ===== 安全服务卡片 ===== */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--safe));
            opacity: 0;
            transition: var(--transition);
        }

        .service-card:hover::before {
            opacity: 1;
        }

        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(59, 130, 246, 0.2);
        }

        .service-card .icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 20px;
            color: #fff;
        }

        .service-card .icon-wrap.blue {
            background: linear-gradient(135deg, #3b82f6, #2563eb);
        }
        .service-card .icon-wrap.green {
            background: linear-gradient(135deg, #10b981, #059669);
        }
        .service-card .icon-wrap.purple {
            background: linear-gradient(135deg, #8b5cf6, #7c3aed);
        }
        .service-card .icon-wrap.amber {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }
        .service-card .icon-wrap.rose {
            background: linear-gradient(135deg, #f43f5e, #e11d48);
        }
        .service-card .icon-wrap.cyan {
            background: linear-gradient(135deg, #06b6d4, #0891b2);
        }

        .service-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .service-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .service-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .service-card .tag-list .tag {
            background: #f1f5f9;
            color: var(--text-secondary);
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 500;
        }

        /* ===== 安全防护体系 ===== */
        .defense-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .defense-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            transition: var(--transition);
        }

        .defense-item:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(59, 130, 246, 0.2);
            transform: translateY(-2px);
        }

        .defense-item .icon {
            font-size: 32px;
            color: var(--accent-light);
            margin-bottom: 16px;
        }

        .defense-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 8px;
        }

        .defense-item p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.6;
        }

        /* ===== 安全资讯 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

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

        .news-card .thumb {
            height: 180px;
            background: linear-gradient(135deg, #1e293b, #0f172a);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.15);
            font-size: 48px;
            position: relative;
        }

        .news-card .thumb .date-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            color: #fff;
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 500;
        }

        .news-card .body {
            padding: 24px;
        }

        .news-card .body .cat {
            display: inline-block;
            background: rgba(59, 130, 246, 0.1);
            color: var(--accent);
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .news-card .body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .news-card .body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== 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-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.2);
        }

        .faq-item .faq-q {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }

        .faq-item .faq-q:hover {
            background: #f8fafc;
        }

        .faq-item .faq-q i {
            color: var(--text-muted);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item.active .faq-q i {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }

        .faq-item.active .faq-a {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 800px;
            height: 800px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 60%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section .container-main {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.6);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .cta-btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            line-height: 1.2;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
        }

        .btn-primary:hover {
            background: var(--accent-dark);
            box-shadow: 0 8px 28px rgba(59, 130, 246, 0.4);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.2);
        }

        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent-light);
            background: rgba(59, 130, 246, 0.1);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-inverse);
            padding: 48px 0 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            flex-shrink: 0;
        }

        .footer-inner {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-brand .logo-text {
            font-size: 18px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            max-width: 280px;
            line-height: 1.7;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .link-group h5 {
            font-size: 14px;
            font-weight: 600;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 12px;
        }

        .link-group a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.45);
            padding: 4px 0;
            transition: var(--transition);
        }

        .link-group a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.3);
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .service-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .defense-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .app-nav {
                transform: translateX(-100%);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-overlay {
                display: block;
                pointer-events: none;
            }
            .mobile-overlay.open {
                pointer-events: auto;
            }
            .main-content {
                padding-top: 64px;
            }
            .container-main {
                padding: 0 20px;
            }
            .hero-section {
                padding: 48px 0 40px;
            }
            .hero-section h1 {
                font-size: 28px;
            }
            .hero-section p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat-item .num {
                font-size: 28px;
            }
            .section-block {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 26px;
            }
            .service-grid {
                grid-template-columns: 1fr;
            }
            .defense-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-links {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section p {
                font-size: 16px;
            }
            .btn {
                padding: 12px 24px;
                font-size: 15px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 6px 16px;
            }
        }

        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }
            .hero-section h1 {
                font-size: 24px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
            .service-card {
                padding: 24px 20px;
            }
            .footer-links {
                grid-template-columns: 1fr;
            }
            .cta-btn-group {
                flex-direction: column;
                align-items: center;
            }
            .section-title h2 {
                font-size: 22px;
            }
        }