/* roulang page: index */
:root {
            --bg-base: #1A1A1A;
            --bg-elevated: #242424;
            --bg-surface: #2E2E2E;
            --accent: #CCFF00;
            --accent-hover: #b8e600;
            --text-main: #FFFFFF;
            --text-muted: #E0E0E0;
            --text-dim: #999999;
            --border-color: #383838;
            --radius-sm: 2px;
            --radius-md: 4px;
            --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
            padding-bottom: 72px;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            transition: opacity 0.4s ease;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部通告条 */
        .top-countdown-bar {
            background: #0f0f0f;
            border-bottom: 1px solid var(--border-color);
            padding: 10px 0;
            font-size: 0.875rem;
            color: var(--text-muted);
        }
        .countdown-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .countdown-badge {
            background: var(--accent);
            color: #000;
            font-weight: 700;
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            text-transform: uppercase;
        }

        /* 导航系统 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 999;
            background: rgba(26, 26, 26, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .brand-logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-main);
        }
        .brand-logo-text span {
            color: var(--accent);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-mock {
            display: flex;
            align-items: center;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            font-size: 0.85rem;
            color: var(--text-dim);
            gap: 8px;
        }
        .header-subnav {
            display: flex;
            align-items: center;
            gap: 32px;
            padding: 12px 0;
            overflow-x: auto;
            white-space: nowrap;
        }
        .nav-item {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 4px 0;
            position: relative;
        }
        .nav-item:hover, .nav-item.active {
            color: var(--accent);
        }
        .nav-item.active::after {
            content: '';
            position: absolute;
            bottom: -12px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--accent);
        }

        /* 按钮与通用组件 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            font-size: 0.95rem;
            font-weight: 700;
            border-radius: var(--radius-sm);
            cursor: pointer;
            border: 1px solid transparent;
            transition: var(--transition);
            gap: 8px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #000000;
        }
        .btn-primary:hover {
            background-color: var(--accent-hover);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--text-main);
            border-color: var(--border-color);
        }
        .btn-secondary:hover {
            border-color: var(--text-main);
            background: rgba(255,255,255,0.05);
            transform: translateY(-2px);
        }

        /* 标题排版规范 */
        .section-header {
            margin-bottom: 48px;
        }
        .section-tag {
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 8px;
            display: block;
        }
        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            color: var(--text-main);
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-dim);
            max-width: 680px;
            line-height: 1.7;
        }

        section {
            padding: 88px 0;
            position: relative;
        }
        .section-alt {
            background-color: #161616;
            border-top: 1px solid rgba(255,255,255,0.03);
            border-bottom: 1px solid rgba(255,255,255,0.03);
        }

        /* 1. Hero Bento 首屏 */
        .hero-section {
            padding: 40px 0 80px 0;
        }
        .hero-bento {
            display: grid;
            grid-template-columns: 2fr 1fr;
            grid-template-rows: auto auto;
            gap: 24px;
        }
        .bento-main {
            grid-row: span 2;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 56px 48px;
            min-height: 520px;
        }
        .bento-main-bg {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.35;
            filter: grayscale(40%);
            z-index: 1;
        }
        .bento-main-content {
            position: relative;
            z-index: 2;
        }
        .bento-main h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .bento-main p {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 32px;
            max-width: 580px;
            line-height: 1.7;
        }
        .bento-sub-box {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition);
        }
        .bento-sub-box:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            box-shadow: 0 10px 30px rgba(0,0,0,0.4);
        }
        .bento-sub-box h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .bento-sub-box p {
            font-size: 0.95rem;
            color: var(--text-dim);
            line-height: 1.6;
        }
        .bento-stat-num {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1;
            margin-top: 16px;
        }

        /* 2. 品牌理念与愿景 */
        .brand-manifesto-box {
            background: var(--bg-elevated);
            border-left: 4px solid var(--accent);
            padding: 48px;
            margin-top: 24px;
        }
        .brand-manifesto-title {
            font-size: 1.75rem;
            font-weight: 800;
            margin-bottom: 20px;
        }

        /* 3. 已上线产品概览 (3x1) */
        .product-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .product-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.5);
            border-color: rgba(204,255,0,0.3);
        }
        .product-media {
            height: 240px;
            background: #111;
            overflow: hidden;
            position: relative;
        }
        .product-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-media img {
            transform: scale(1.05);
        }
        .product-info {
            padding: 28px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .product-info h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .product-info p {
            color: var(--text-dim);
            font-size: 0.92rem;
            margin-bottom: 20px;
            line-height: 1.6;
            flex: 1;
        }
        .tech-pill-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
        }
        .tech-pill {
            background: var(--bg-surface);
            color: var(--text-muted);
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: var(--radius-sm);
        }

        /* 4. 核心优势 (3x2 网格) */
        .features-grid-6 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 32px;
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }
        .feature-metric {
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 700;
            font-family: monospace;
            margin-bottom: 12px;
            display: inline-block;
            background: rgba(204,255,0,0.1);
            padding: 2px 6px;
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-dim);
            line-height: 1.6;
        }

        /* 5. 场景演示 (分屏) */
        .scene-container {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }
        .scene-item {
            display: grid;
            grid-template-columns: 1fr 1fr;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            overflow: hidden;
        }
        .scene-item.reversed {
            direction: rtl;
        }
        .scene-item.reversed .scene-text {
            direction: ltr;
        }
        .scene-img-wrap {
            min-height: 360px;
            background: #111;
        }
        .scene-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .scene-text {
            padding: 48px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .scene-text h3 {
            font-size: 1.75rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .scene-text p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.7;
            margin-bottom: 24px;
        }

        /* 6. 技术标准与专利认证 */
        .standards-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .std-box {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            padding: 24px;
            text-align: center;
        }
        .std-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 6px;
            font-family: monospace;
        }
        .std-name {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* 7. 深色哲学引语区 */
        .quote-manifesto-section {
            background: #0d0d0d;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 100px 0;
            text-align: center;
        }
        .quote-statement {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.4;
            max-width: 900px;
            margin: 0 auto 24px;
            color: var(--text-main);
        }
        .quote-author {
            color: var(--accent);
            font-size: 1rem;
            letter-spacing: 2px;
            text-transform: uppercase;
        }

        /* 8. 用户训练故事 (交错) */
        .stories-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .story-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 36px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .story-metric-box {
            display: flex;
            gap: 24px;
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            margin-top: 24px;
        }
        .story-data h4 {
            font-size: 1.5rem;
            color: var(--accent);
            font-weight: 800;
        }
        .story-data span {
            font-size: 0.8rem;
            color: var(--text-dim);
        }

        /* 9. 数据统计条 */
        .stat-counter-section {
            background: var(--accent);
            color: #000;
            padding: 60px 0;
        }
        .stat-counter-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            text-align: center;
        }
        .stat-counter-item h3 {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1;
            margin-bottom: 8px;
            letter-spacing: -1px;
        }
        .stat-counter-item p {
            font-size: 1.05rem;
            font-weight: 700;
            color: rgba(0,0,0,0.8);
        }

        /* 10. 用户评价墙 */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .testimonial-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .testimonial-text {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 24px;
            font-style: italic;
        }
        .user-meta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .user-avatar-initial {
            width: 44px;
            height: 44px;
            background: var(--bg-surface);
            border: 1px solid var(--accent);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
        }
        .user-tag-text {
            font-size: 0.8rem;
            color: var(--text-dim);
        }

        /* 11. 热门产品区 (选配对比) */
        .hot-products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .hot-product-box {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 36px 28px;
            text-align: center;
            position: relative;
            transition: var(--transition);
        }
        .hot-product-box.featured {
            border-color: var(--accent);
        }
        .hot-badge {
            position: absolute;
            top: 0;
            right: 0;
            background: var(--accent);
            color: #000;
            font-size: 0.75rem;
            font-weight: 800;
            padding: 4px 12px;
        }
        .hot-product-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }
        .product-price {
            font-size: 2rem;
            font-weight: 800;
            margin: 16px 0;
            color: var(--text-main);
        }

        /* 12. 研发动态与资讯 */
        .news-timeline-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 28px;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .news-card:hover {
            border-color: var(--accent);
        }
        .news-date {
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .news-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.4;
        }
        .news-card p {
            font-size: 0.9rem;
            color: var(--text-dim);
            line-height: 1.6;
        }

        /* 13. 常见异议与解答 (FAQ) */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
        }
        .faq-item summary {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--accent);
        }
        .faq-item[open] summary::after {
            content: '−';
        }
        .faq-content {
            padding: 0 24px 24px 24px;
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
            border-top: 1px solid rgba(255,255,255,0.05);
            margin-top: 12px;
            padding-top: 16px;
        }

        /* 14. 专家评测与实测观点 */
        .expert-quote-card {
            background: var(--bg-surface);
            border-left: 4px solid var(--accent);
            padding: 40px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .expert-quote-card p {
            font-size: 1.1rem;
            color: var(--text-main);
            line-height: 1.8;
        }
        .expert-signer {
            font-size: 0.9rem;
            color: var(--text-dim);
            font-weight: 600;
        }

        /* 15. 服务保障条 */
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .guarantee-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            padding: 28px 20px;
            text-align: center;
        }
        .guarantee-card h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .guarantee-card p {
            font-size: 0.85rem;
            color: var(--text-dim);
        }

        /* 16. 底部固定转化条 */
        .fixed-bottom-cta {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(20, 20, 20, 0.96);
            backdrop-filter: blur(10px);
            border-top: 1px solid var(--border-color);
            padding: 14px 0;
            z-index: 1000;
        }
        .fixed-cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .cta-tele-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .cta-tele-label {
            font-size: 0.8rem;
            color: var(--text-dim);
        }
        .cta-tele-num {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--accent);
            font-family: monospace;
        }

        /* 页脚规范 */
        .site-footer {
            background: #111111;
            border-top: 1px solid var(--border-color);
            padding: 64px 0 32px 0;
            color: var(--text-dim);
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-brand-title {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .footer-col h4 {
            color: var(--text-main);
            font-size: 1rem;
            margin-bottom: 16px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solidrgba(255,255,255,0.06);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
        }

        /* 响应式断点适配 */
        @media (max-width: 1200px) {
            .hero-bento {
                grid-template-columns: 1fr;
            }
            .bento-main {
                grid-row: auto;
                min-height: 420px;
            }
            .standards-matrix, .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 1.85rem;
            }
            .bento-main h1 {
                font-size: 2.1rem;
            }
            .product-grid-3, .features-grid-6, .hot-products-grid, .news-timeline-grid, .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .scene-item, .scene-item.reversed {
                grid-template-columns: 1fr;
                direction: ltr;
            }
            .scene-img-wrap {
                min-height: 240px;
            }
            .scene-text {
                padding: 32px 24px;
            }
            .stories-grid {
                grid-template-columns: 1fr;
            }
            .stat-counter-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .fixed-cta-inner {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }
            .cta-tele-wrap {
                justify-content: center;
            }
        }

        @media (max-width: 375px) {
            .container {
                padding: 0 16px;
            }
            .bento-main {
                padding: 32px 20px;
            }
            .standards-matrix, .guarantee-grid {
                grid-template-columns: 1fr;
            }
        }