/* roulang page: index */
:root {
            --primary: #00E599;
            --primary-hover: #00c784;
            --primary-dark: #0A0F1D;
            --accent: #FF5500;
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-dark: #121826;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-light: #F8FAFC;
            --text-light-muted: #94A3B8;
            --border-light: #E2E8F0;
            --border-dark: rgba(255, 255, 255, 0.08);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-pill: 9999px;
            --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(0, 229, 153, 0.2);
            --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

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

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部通栏信息条 */
        .top-bar {
            height: 36px;
            background: var(--primary-dark);
            color: var(--text-light-muted);
            font-size: 12px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border-dark);
        }

        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .top-bar-links a {
            margin-left: 20px;
            color: var(--text-light-muted);
        }
        .top-bar-links a:hover {
            color: var(--primary);
        }

        /* 主导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 70px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.5px;
        }

        .logo-symbol {
            width: 32px;
            height: 32px;
            background: var(--primary-dark);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .logo-symbol::before {
            content: '';
            width: 14px;
            height: 14px;
            border: 3px solid var(--primary);
            border-top: none;
            border-right: none;
            transform: rotate(-45deg);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 24px;
            list-style: none;
        }

        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--primary-dark);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            box-shadow: 0 4px 15px rgba(0, 229, 153, 0.35);
        }

        .btn-outline {
            border-color: var(--border-light);
            background: transparent;
            color: var(--text-main);
        }

        .btn-outline:hover {
            border-color: var(--primary-dark);
            color: var(--primary-dark);
        }

        .btn-white {
            background: #fff;
            color: var(--primary-dark);
        }
        .btn-white:hover {
            background: #f1f5f9;
        }

        .btn-sm {
            padding: 6px 14px;
            font-size: 13px;
        }

        /* Section 通用排版 */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 50px auto;
        }

        .section-badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            color: var(--primary-dark);
            background: rgba(0, 229, 153, 0.15);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary-dark);
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 1. Hero 板块 */
        #section-hero {
            padding: 60px 0 90px;
            background: linear-gradient(135deg, #0A0F1D 0%, #172238 100%);
            color: var(--text-light);
            overflow: hidden;
            position: relative;
        }

        .hero-bg-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/d7b0c49a25302fdf.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid var(--border-dark);
            font-size: 13px;
            color: var(--primary);
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 46px;
            font-weight: 900;
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-title span {
            color: var(--primary);
        }

        .hero-text {
            font-size: 16px;
            color: var(--text-light-muted);
            line-height: 1.7;
            margin-bottom: 35px;
        }

        .hero-btns {
            display: flex;
            gap: 16px;
            margin-bottom: 40px;
        }

        .hero-metrics {
            display: flex;
            gap: 30px;
            padding-top: 25px;
            border-top: 1px solid var(--border-dark);
        }

        .hero-metric-item h4 {
            font-size: 24px;
            color: var(--primary);
            font-weight: 800;
            font-family: monospace;
        }

        .hero-metric-item p {
            font-size: 12px;
            color: var(--text-light-muted);
        }

        .hero-media-box {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.15);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .hero-media-box img {
            width: 100%;
            height: 380px;
            object-fit: cover;
        }

        .hero-tag-overlay {
            position: absolute;
            bottom: 16px;
            left: 16px;
            right: 16px;
            background: rgba(10, 15, 29, 0.88);
            backdrop-filter: blur(8px);
            padding: 12px 18px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-dark);
            font-size: 12px;
            color: #fff;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* 2. 产品体系架构区 */
        #section-intro {
            background: var(--bg-white);
        }

        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .intro-spec-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 24px;
            background: var(--bg-light);
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid var(--border-light);
        }

        .intro-spec-table th, .intro-spec-table td {
            padding: 14px 18px;
            font-size: 14px;
            text-align: left;
            border-bottom: 1px solid var(--border-light);
        }

        .intro-spec-table th {
            width: 35%;
            color: var(--text-muted);
            background: #f1f5f9;
        }

        .intro-spec-table td {
            color: var(--text-main);
            font-weight: 600;
        }

        /* 3. 核心优势卡片区 */
        #section-advantages {
            background: var(--bg-light);
        }

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

        .adv-card {
            background: var(--bg-white);
            padding: 30px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .adv-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }

        .adv-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 153, 0.12);
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 20px;
        }

        .adv-card h3 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--primary-dark);
        }

        .adv-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 4. 热门方案区 */
        #section-products {
            background: var(--bg-white);
        }

        .products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .product-card {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-white);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .product-card:hover {
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
            border-color: var(--primary);
        }

        .product-img-wrap {
            height: 180px;
            overflow: hidden;
            position: relative;
        }

        .product-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .product-body {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .product-body h3 {
            font-size: 20px;
            margin-bottom: 10px;
            color: var(--primary-dark);
        }

        .product-body p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .feature-checklist {
            list-style: none;
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .feature-checklist li {
            font-size: 13px;
            color: var(--text-main);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .feature-checklist li::before {
            content: '✓';
            color: var(--primary-hover);
            font-weight: bold;
        }

        /* 5. 深色算法理念区 */
        #section-philosophy {
            background: var(--bg-dark);
            color: var(--text-light);
        }

        .philosophy-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .philosophy-content h2 {
            color: var(--text-light);
        }

        .philosophy-content p {
            color: var(--text-light-muted);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .code-box-preview {
            background: #0A0F1D;
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 24px;
            font-family: monospace;
            font-size: 13px;
            color: var(--text-light-muted);
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }

        .code-box-preview span.hi {
            color: var(--primary);
        }
        .code-box-preview span.prop {
            color: #38bdf8;
        }

        /* 6. 实战故事区 */
        #section-stories {
            background: var(--bg-light);
        }

        .stories-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .story-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }

        .story-card img {
            height: 220px;
            width: 100%;
            object-fit: cover;
        }

        .story-info {
            padding: 24px;
        }

        .story-role {
            font-size: 12px;
            color: var(--accent);
            font-weight: 700;
            margin-bottom: 6px;
        }

        .story-info h3 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--primary-dark);
        }

        .story-info p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 7. 关键数据指标条 */
        #section-stats {
            background: var(--primary-dark);
            padding: 50px 0;
            border-top: 1px solid var(--border-dark);
            border-bottom: 1px solid var(--border-dark);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }

        .stat-num {
            font-size: 42px;
            font-weight: 900;
            color: var(--primary);
            font-family: monospace;
            line-height: 1;
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-light-muted);
        }

        /* 8. 客户评价墙 */
        #section-reviews {
            background: var(--bg-white);
        }

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

        .review-card {
            background: var(--bg-light);
            padding: 28px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
        }

        .review-stars {
            color: #eab308;
            margin-bottom: 12px;
            font-size: 14px;
        }

        .review-text {
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-dark);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 14px;
        }

        .author-meta h5 {
            font-size: 14px;
            color: var(--primary-dark);
        }

        .author-meta span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 9. 新闻资讯区 */
        #section-news {
            background: var(--bg-light);
        }

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

        .news-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .news-meta-top {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 12px;
        }

        .news-tag {
            color: var(--primary-dark);
            font-weight: 600;
        }

        .news-card h3 {
            font-size: 16px;
            color: var(--primary-dark);
            margin-bottom: 12px;
            line-height: 1.5;
        }

        .news-card p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        /* 10. FAQ 手风琴区 */
        #section-faq {
            background: var(--bg-white);
        }

        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            overflow: hidden;
            background: var(--bg-white);
        }

        .faq-question {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 700;
            color: var(--primary-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            background: #fafafa;
        }

        .faq-question::after {
            content: '+';
            font-size: 20px;
            color: var(--text-muted);
            transition: transform 0.2s;
        }

        .faq-item.active .faq-question::after {
            content: '−';
        }

        .faq-answer {
            padding: 0 22px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            padding: 18px 22px;
            max-height: 300px;
            border-top: 1px solid var(--border-light);
        }

        /* 11. 全景开通咨询 CTA */
        #section-cta {
            background: linear-gradient(135deg, #0A0F1D 0%, #151d30 100%);
            color: #fff;
            padding: 80px 0;
        }

        .cta-box {
            display: grid;
            grid-template-columns: 1fr 1.1fr;
            gap: 50px;
            align-items: center;
        }

        .cta-info h2 {
            font-size: 32px;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .cta-info p {
            color: var(--text-light-muted);
            font-size: 15px;
            margin-bottom: 24px;
            line-height: 1.6;
        }

        .cta-form {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-dark);
            padding: 30px;
            border-radius: var(--radius-md);
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            color: var(--text-light-muted);
            margin-bottom: 6px;
        }

        .form-control {
            width: 100%;
            padding: 12px 14px;
            background: rgba(10, 15, 29, 0.6);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 14px;
            outline: none;
            transition: border-color 0.2s;
        }

        .form-control:focus {
            border-color: var(--primary);
        }

        /* 12. 战略生态矩阵区 */
        #section-ecosystem {
            background: var(--bg-light);
            padding: 50px 0;
            border-top: 1px solid var(--border-light);
        }

        .ecosystem-logos {
            display: flex;
            justify-content: space-around;
            align-items: center;
            flex-wrap: wrap;
            gap: 30px;
            opacity: 0.7;
        }

        .eco-item {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .eco-dot {
            width: 8px;
            height: 8px;
            background: var(--primary);
            border-radius: 50%;
        }

        /* 页脚 */
        .site-footer {
            background: var(--primary-dark);
            color: var(--text-light-muted);
            padding: 70px 0 30px 0;
            border-top: 1px solid var(--border-dark);
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            margin-bottom: 20px;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 12px;
        }

        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            padding-top: 25px;
            border-top: 1px solid var(--border-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
        }

        /* 响应式断点 */
        @media (max-width: 991px) {
            .hero-grid,
            .intro-grid,
            .philosophy-grid,
            .cta-box {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .advantages-grid,
            .products-grid,
            .reviews-grid,
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .nav-links {
                display: none;
            }
        }

        @media (max-width: 576px) {
            .advantages-grid,
            .products-grid,
            .stories-grid,
            .reviews-grid,
            .news-grid,
            .stats-grid,
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 32px;
            }
            .section-title {
                font-size: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
        }