/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-light: #2563EB;
            --accent: #0284C7;
            --accent-hover: #0369A1;
            --bg-main: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-dark: #0F172A;
            --text-dark: #0F172A;
            --text-body: #475569;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            --transition: all 0.3s ease-in-out;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-main);
            line-height: 1.7;
        }

        body {
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }

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

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

        /* 顶部双行导航 */
        .top-bar {
            background-color: #1E293B;
            color: #CBD5E1;
            font-size: 0.875rem;
            padding: 0.5rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .top-bar-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-info span {
            margin-right: 1.5rem;
        }

        header.main-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
        }
        .nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
        }
        .brand-logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .brand-logo svg {
            width: 28px;
            height: 28px;
            fill: var(--accent);
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 1.75rem;
            align-items: center;
        }
        .nav-menu a {
            font-weight: 500;
            color: var(--text-dark);
            font-size: 0.95rem;
        }
        .nav-menu a:hover {
            color: var(--primary);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }
        .btn-primary:hover {
            background-color: var(--primary-light);
            box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
            transform: translateY(-2px);
        }
        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
        }
        .btn-outline {
            border-color: var(--border);
            color: var(--text-dark);
            background-color: #FFFFFF;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: #F8FAFC;
        }

        /* 移动端菜单按钮 */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
        }

        /* 通用板块 */
        section {
            padding: 5rem 0;
            position: relative;
        }
        .section-light {
            background-color: var(--bg-white);
        }
        .section-alt {
            background-color: var(--bg-main);
        }
        .section-dark {
            background-color: var(--bg-dark);
            color: #F8FAFC;
        }
        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 3.5rem;
        }
        .section-tag {
            display: inline-block;
            padding: 0.35rem 0.85rem;
            background-color: rgba(2, 132, 199, 0.1);
            color: var(--accent);
            font-weight: 600;
            font-size: 0.85rem;
            border-radius: 9999px;
            margin-bottom: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        .section-dark .section-title {
            color: #FFFFFF;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-body);
        }
        .section-dark .section-subtitle {
            color: #94A3B8;
        }

        /* Section 1: Hero Banner */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%), url('/assets/images/a001e921ba5cd8f5.webp') center/cover no-repeat;
            background-blend-mode: overlay;
            color: #FFFFFF;
            padding: 6.5rem 0 7rem;
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 3rem;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 2.75rem;
            line-height: 1.25;
            font-weight: 800;
            margin-bottom: 1.25rem;
            letter-spacing: -0.5px;
        }
        .hero-content p {
            font-size: 1.125rem;
            color: #CBD5E1;
            margin-bottom: 2rem;
            line-height: 1.75;
        }
        .hero-cta-group {
            display: flex;
            gap: 1rem;
            margin-bottom: 2.5rem;
        }
        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.15);
            padding-top: 1.5rem;
        }
        .badge-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.9rem;
            color: #E2E8F0;
        }
        .badge-icon {
            width: 20px;
            height: 20px;
            color: #38BDF8;
        }
        .hero-card-preview {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }
        .preview-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 1rem;
        }
        .pulse-dot {
            width: 10px;
            height: 10px;
            background-color: #10B981;
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
            70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
            100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }

        /* Section 2: 系统架构介绍 */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        .intro-visual {
            position: relative;
        }
        .intro-visual img {
            box-shadow: var(--shadow-lg);
            width: 100%;
            height: 380px;
            object-fit: cover;
        }
        .metric-badge-overlap {
            position: absolute;
            bottom: -20px;
            right: 20px;
            background: #FFFFFF;
            padding: 1.25rem 1.75rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            border-left: 4px solid var(--primary);
        }
        .metric-badge-overlap .num {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1;
        }
        .metric-badge-overlap .label {
            font-size: 0.85rem;
            color: var(--text-body);
            margin-top: 0.35rem;
        }
        .feature-bullet-list {
            margin-top: 1.5rem;
            list-style: none;
        }
        .feature-bullet-list li {
            position: relative;
            padding-left: 1.75rem;
            margin-bottom: 0.85rem;
            font-size: 0.95rem;
        }
        .feature-bullet-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
        }

        /* Section 3: 核心算力网格 (3x2) */
        .grid-3x2 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .feature-card {
            background: #FFFFFF;
            padding: 2rem;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(30, 64, 175, 0.3);
        }
        .card-icon {
            width: 50px;
            height: 50px;
            background: rgba(30, 64, 175, 0.08);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            margin-bottom: 1.25rem;
        }
        .feature-card h3 {
            font-size: 1.2rem;
            color: var(--text-dark);
            margin-bottom: 0.75rem;
            font-weight: 600;
        }
        .feature-card p {
            font-size: 0.925rem;
            color: var(--text-body);
            line-height: 1.6;
        }

        /* Section 4: 热门应用产品矩阵 */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .product-card {
            background: #FFFFFF;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .product-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .product-card img {
            height: 200px;
            width: 100%;
            object-fit: cover;
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .product-card-body {
            padding: 1.75rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .product-tag {
            align-self: flex-start;
            padding: 0.25rem 0.65rem;
            background: #EFF6FF;
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 4px;
            margin-bottom: 0.75rem;
        }
        .product-card h3 {
            font-size: 1.25rem;
            color: var(--text-dark);
            margin-bottom: 0.75rem;
        }
        .product-card p {
            font-size: 0.925rem;
            color: var(--text-body);
            margin-bottom: 1.5rem;
            flex-grow: 1;
        }

        /* Section 5: 深色沉浸式案例与理念 */
        .dark-concept-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        .concept-item {
            margin-bottom: 2rem;
        }
        .concept-item h4 {
            font-size: 1.15rem;
            color: #38BDF8;
            margin-bottom: 0.5rem;
        }
        .concept-item p {
            color: #94A3B8;
            font-size: 0.95rem;
        }

        /* Section 6: 多维场景演示 */
        .scenarios-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2.5rem;
        }
        .scenario-card {
            background: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow-sm);
            display: flex;
            gap: 1.5rem;
        }
        .scenario-thumb {
            width: 130px;
            height: 130px;
            flex-shrink: 0;
            object-fit: cover;
            border-radius: 8px;
        }
        .scenario-text h3 {
            font-size: 1.2rem;
            color: var(--text-dark);
            margin-bottom: 0.5rem;
        }
        .scenario-text p {
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.6;
        }

        /* Section 7: 运营数据统计条 */
        .metric-bar-section {
            background: #1E3A8A;
            color: #FFFFFF;
            padding: 3.5rem 0;
        }
        .metric-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
        }
        .metric-item .count {
            font-size: 2.5rem;
            font-weight: 800;
            color: #38BDF8;
            line-height: 1;
            margin-bottom: 0.5rem;
            font-family: inherit;
        }
        .metric-item .desc {
            font-size: 0.95rem;
            color: #E2E8F0;
        }

        /* Section 8: 客户评价 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .testimonial-card {
            background: #FFFFFF;
            padding: 2rem;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .testimonial-stars {
            color: #F59E0B;
            font-size: 1rem;
            margin-bottom: 1rem;
        }
        .testimonial-quote {
            font-size: 0.95rem;
            color: var(--text-body);
            font-style: italic;
            margin-bottom: 1.5rem;
            line-height: 1.6;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            border-top: 1px solid var(--border);
            padding-top: 1rem;
        }
        .author-avatar {
            width: 44px;
            height: 44px;
            background: #E2E8F0;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
        }
        .author-info h4 {
            font-size: 0.95rem;
            color: var(--text-dark);
        }
        .author-info p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Section 9: 前沿资讯速递 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .news-card {
            background: #FFFFFF;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .news-card-body {
            padding: 1.5rem;
        }
        .news-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        .news-card h3 {
            font-size: 1.15rem;
            color: var(--text-dark);
            margin-bottom: 0.75rem;
            line-height: 1.4;
        }
        .news-card p {
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.6;
        }

        /* Section 10: FAQ 折叠面板 */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 1rem;
            overflow: hidden;
        }
        .faq-question {
            width: 100%;
            padding: 1.25rem 1.5rem;
            text-align: left;
            background: none;
            border: none;
            outline: none;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            font-size: 1.25rem;
            transition: transform 0.3s ease;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
            padding: 0 1.5rem;
            color: var(--text-body);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            padding: 0 1.5rem 1.25rem;
            max-height: 300px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* Section 11: 落地转化表单 */
        .conversion-section {
            background: linear-gradient(to bottom, #F8FAFC, #EFF6FF);
        }
        .form-card {
            background: #FFFFFF;
            max-width: 760px;
            margin: 0 auto;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
        }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.25rem;
            margin-bottom: 1.25rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.4rem;
        }
        .form-group.full-width {
            grid-column: span 2;
        }
        .form-group label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-dark);
        }
        .form-control {
            padding: 0.75rem 1rem;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.15);
        }
        .trust-badges-bar {
            display: flex;
            justify-content: space-around;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border);
            text-align: center;
        }
        .trust-badge-item {
            font-size: 0.85rem;
            color: var(--text-body);
            font-weight: 500;
        }

        /* Section 12: 吸底常驻转化条 */
        .sticky-cta-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: #FFFFFF;
            border-top: 1px solid var(--border);
            box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.05);
            padding: 0.75rem 0;
            z-index: 999;
            transform: translateY(100%);
            transition: transform 0.3s ease-in-out;
        }
        .sticky-cta-bar.visible {
            transform: translateY(0);
        }
        .sticky-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .sticky-text {
            font-weight: 600;
            color: var(--text-dark);
            font-size: 0.95rem;
        }
        .sticky-actions {
            display: flex;
            gap: 1rem;
            align-items: center;
        }

        /* 页脚 */
        footer.main-footer {
            background-color: #0F172A;
            color: #94A3B8;
            padding: 4rem 0 2rem;
            font-size: 0.9rem;
            border-top: 1px solid #1E293B;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }
        .footer-brand p {
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        .footer-col h4 {
            color: #FFFFFF;
            font-size: 1rem;
            margin-bottom: 1.25rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.65rem;
        }
        .footer-links a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #1E293B;
            font-size: 0.85rem;
        }

        /* 响应式断点适配 */
        @media (max-width: 1024px) {
            .grid-3x2, .product-grid, .testimonial-grid, .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metric-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 2.5rem;
            }
            .hero-grid, .intro-grid, .dark-concept-grid {
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 3rem 0;
            }
            .top-bar {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: 72px;
                left: 0;
                width: 100%;
                background: #FFFFFF;
                flex-direction: column;
                padding: 2rem;
                gap: 1.25rem;
                box-shadow: var(--shadow-lg);
                transform: translateY(-150%);
                transition: transform 0.3s ease;
            }
            .nav-menu.active {
                transform: translateY(0);
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .grid-3x2, .product-grid, .testimonial-grid, .news-grid, .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            .sticky-text {
                display: none;
            }
            .sticky-flex {
                justify-content: center;
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }