/* roulang page: index */
:root {
            --bg-deep: #060913;
            --bg-dark: #0b1120;
            --bg-card: rgba(15, 23, 42, 0.72);
            --bg-card-hover: rgba(30, 41, 59, 0.85);
            --primary-cyan: #00F0FF;
            --primary-blue: #2563EB;
            --accent-green: #10B981;
            --accent-warn: #F59E0B;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --text-dark: #64748B;
            --border-subtle: rgba(56, 189, 248, 0.16);
            --border-glow: rgba(0, 240, 255, 0.45);
            --glow-shadow: 0 0 24px rgba(0, 240, 255, 0.28);
            --radius-md: 14px;
            --radius-lg: 20px;
            --container-max: 1240px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.65;
            background-image: 
                radial-gradient(circle at 15% 15%, rgba(0, 240, 255, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 85% 85%, rgba(37, 99, 235, 0.08) 0%, transparent 45%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

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

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

        /* 顶部工具条与导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(6, 9, 19, 0.88);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
        }

        .top-toolbar {
            background: rgba(11, 17, 32, 0.95);
            font-size: 0.8125rem;
            color: var(--text-muted);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding: 6px 0;
        }

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

        .toolbar-status {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .status-dot {
            width: 8px;
            height: 8px;
            background-color: var(--accent-green);
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 8px var(--accent-green);
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 12px var(--accent-green); }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        .main-nav {
            padding: 14px 0;
        }

        .nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-main);
        }

        .logo-symbol {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
        }

        .logo-symbol svg {
            width: 22px;
            height: 22px;
            fill: #060913;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 28px;
        }

        .nav-link {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 500;
            padding: 6px 0;
            position: relative;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--primary-cyan);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-cyan);
            transition: var(--transition);
        }

        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }

        .btn-glow {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            color: #060913;
            background: linear-gradient(135deg, var(--primary-cyan) 0%, #38bdf8 100%);
            border-radius: 30px;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-glow:hover {
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-subtle);
            border-radius: 30px;
            backdrop-filter: blur(8px);
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--primary-cyan);
            color: var(--primary-cyan);
        }

        /* 基础 Section 排版 */
        .section-block {
            padding: 85px 0;
            position: relative;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }

        .section-block.alt-bg {
            background-color: rgba(11, 17, 32, 0.45);
        }

        .section-head {
            margin-bottom: 48px;
            text-align: left;
        }

        .section-head.center {
            text-align: center;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-subtitle {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--primary-cyan);
            margin-bottom: 10px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .section-head.center .section-subtitle {
            justify-content: center;
        }

        .section-title {
            font-size: 2.15rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 玻璃拟态卡片 */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 10px 30px rgba(0, 240, 255, 0.12), inset 0 0 15px rgba(56, 189, 248, 0.1);
            transform: translateY(-4px);
        }

        /* 徽章 Badge */
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--primary-cyan);
            margin-bottom: 12px;
        }

        /* 1. Hero Section */
        .hero-section {
            padding: 70px 0 90px;
            background-position: center;
            background-size: cover;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-subtle);
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(6, 9, 19, 0.75) 0%, rgba(6, 9, 19, 0.95) 100%),
                        radial-gradient(circle at 70% 30%, rgba(0, 240, 255, 0.12), transparent 50%);
            z-index: 1;
        }

        .hero-section .container {
            position: relative;
            z-index: 2;
        }

        .hero-content {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }

        .hero-h1 {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.25;
            margin: 18px 0 20px;
            background: linear-gradient(135deg, #ffffff 30%, #a5f3fc 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-lead {
            font-size: 1.1rem;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 32px;
            text-align: justify;
            text-justify: inter-ideograph;
        }

        /* 信任检查清单 */
        .trust-checklist {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-bottom: 36px;
            padding: 14px 24px;
            background: rgba(15, 23, 42, 0.6);
            border: 1px solid var(--border-subtle);
            border-radius: 40px;
            backdrop-filter: blur(8px);
        }

        .check-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--text-main);
        }

        .check-icon {
            color: var(--accent-green);
            font-weight: bold;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        /* 2. 数据指标看板 (Metrics Dashboard) */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .metric-card {
            text-align: left;
            position: relative;
            overflow: hidden;
            border-top: 3px solid var(--primary-cyan);
        }

        .metric-value {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-cyan);
            line-height: 1.1;
            margin: 12px 0 6px;
            font-feature-settings: "tnum";
        }

        .metric-label {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 6px;
        }

        .metric-sub {
            font-size: 0.8125rem;
            color: var(--text-dark);
        }

        /* 3. 架构介绍区 (Platform Architecture) */
        .arch-layout {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
        }

        .arch-img-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .arch-img-wrap img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            transition: var(--transition);
        }

        .arch-img-wrap:hover img {
            transform: scale(1.03);
        }

        .arch-feature-list {
            list-style: none;
            margin-top: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .arch-feature-item {
            display: flex;
            gap: 16px;
        }

        .arch-item-num {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: rgba(0, 240, 255, 0.1);
            color: var(--primary-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        /* 4. 核心服务矩阵 (3x2 Grid) */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(37, 99, 235, 0.15));
            border: 1px solid var(--border-subtle);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }

        .service-icon svg {
            width: 24px;
            height: 24px;
            fill: var(--primary-cyan);
        }

        /* 5. 热门智能穿戴终端产品区 */
        .devices-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .device-card {
            display: flex;
            flex-direction: column;
            padding: 0;
            overflow: hidden;
        }

        .device-img-holder {
            height: 210px;
            overflow: hidden;
            position: relative;
            background: rgba(0, 0, 0, 0.3);
        }

        .device-img-holder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .device-card:hover .device-img-holder img {
            transform: scale(1.05);
        }

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

        .spec-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }

        .spec-tag {
            font-size: 0.75rem;
            padding: 3px 8px;
            border-radius: 4px;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-muted);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        /* 6. 算法成效与数据结果对比区 */
        .comparison-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .comp-card {
            border-radius: var(--radius-md);
            padding: 32px;
        }

        .comp-card.traditional {
            background: rgba(15, 23, 42, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .comp-card.platform {
            background: rgba(15, 23, 42, 0.85);
            border: 1px solid var(--border-glow);
            box-shadow: var(--glow-shadow);
        }

        .comp-list {
            margin-top: 24px;
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .comp-list-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding-bottom: 12px;
        }

        .comp-stat-val {
            font-weight: 700;
            font-size: 1.15rem;
        }

        /* 7. 深色专业案例与运动科研理念区 */
        .philosophy-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 36px;
            align-items: center;
        }

        .case-highlight {
            padding: 30px;
            border-left: 3px solid var(--primary-cyan);
            background: rgba(15, 23, 42, 0.5);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin-top: 20px;
        }

        /* 8. 典型标杆用户故事 */
        .story-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .story-user {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 16px;
        }

        .story-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #060913;
        }

        /* 9. 发展里程碑与技术演进轴 */
        .timeline-container {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }

        .timeline-container::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 2px;
            background: linear-gradient(180deg, var(--primary-cyan), var(--primary-blue), transparent);
            transform: translateX(-50%);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            width: 50%;
        }

        .timeline-item.left {
            left: 0;
            padding-right: 40px;
            text-align: right;
        }

        .timeline-item.right {
            left: 50%;
            padding-left: 40px;
            text-align: left;
        }

        .timeline-dot {
            position: absolute;
            top: 20px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--primary-cyan);
            box-shadow: 0 0 10px var(--primary-cyan);
        }

        .timeline-item.left .timeline-dot {
            right: -7px;
        }

        .timeline-item.right .timeline-dot {
            left: -7px;
        }

        .timeline-year {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--primary-cyan);
            margin-bottom: 6px;
        }

        /* 10. 用户口碑与信赖评价区 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .rating-stars {
            color: #FBBF24;
            letter-spacing: 2px;
            margin-bottom: 12px;
        }

        /* 11. 前沿资讯与动态列表 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .news-card {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .news-date {
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: 8px;
            padding: 10px 14px;
            text-align: center;
            flex-shrink: 0;
        }

        .news-date-day {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--primary-cyan);
            line-height: 1;
        }

        .news-date-m {
            font-size: 0.75rem;
            color: var(--text-dark);
            margin-top: 4px;
        }

        /* 12. 平台权威安全保障与合规资质 */
        .assurance-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .assurance-card {
            text-align: center;
            padding: 30px 20px;
        }

        .assurance-icon {
            font-size: 2rem;
            margin-bottom: 12px;
            display: block;
        }

        /* 13. 高频解答 FAQ */
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            background: var(--bg-card);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(56, 189, 248, 0.35);
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-icon-arrow {
            transition: transform 0.3s ease;
            font-weight: bold;
            color: var(--primary-cyan);
        }

        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            display: block;
        }

        /* 底部接入申请表单 */
        .cta-form-section {
            background: linear-gradient(180deg, var(--bg-deep) 0%, #080f20 100%);
            padding: 80px 0;
            border-top: 1px solid var(--border-subtle);
        }

        .form-box {
            max-width: 680px;
            margin: 0 auto;
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: 0 10px 40px rgba(0, 240, 255, 0.15);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 18px;
            margin-top: 24px;
        }

        .form-group-full {
            grid-column: span 2;
        }

        .form-label {
            display: block;
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            font-weight: 500;
        }

        .form-input, .form-select, .form-textarea {
            width: 100%;
            background: rgba(6, 9, 19, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: 8px;
            padding: 12px 16px;
            color: var(--text-main);
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
            background: rgba(6, 9, 19, 0.9);
        }

        .form-textarea {
            resize: vertical;
            min-height: 90px;
        }

        .form-submit-btn {
            width: 100%;
            padding: 14px;
            font-size: 1rem;
            font-weight: 700;
            margin-top: 10px;
        }

        /* 统一页脚 */
        .site-footer {
            background-color: #03050a;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 60px 0 30px;
            font-size: 0.875rem;
            color: var(--text-dark);
        }

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

        .footer-brand-desc {
            color: var(--text-muted);
            line-height: 1.7;
            margin-top: 16px;
            max-width: 320px;
        }

        .footer-col-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 18px;
        }

        .footer-links-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links-list a:hover {
            color: var(--primary-cyan);
        }

        .footer-bottom {
            padding-top: 25px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .copyright-text {
            color: var(--text-dark);
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid, .devices-grid, .story-grid, .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .assurance-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .arch-layout {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .top-toolbar {
                display: none;
            }
            .nav-menu {
                display: none;
            }
            .hero-h1 {
                font-size: 1.85rem;
            }
            .section-title {
                font-size: 1.65rem;
            }
            .section-block {
                padding: 55px 0;
            }
            .services-grid, .devices-grid, .story-grid, .testimonial-grid, .news-grid, .comparison-wrapper, .philosophy-grid {
                grid-template-columns: 1fr;
            }
            .metrics-grid, .assurance-grid {
                grid-template-columns: 1fr;
            }
            .timeline-container::before {
                left: 20px;
            }
            .timeline-item {
                width: 100%;
                left: 0 !important;
                padding-left: 50px !important;
                padding-right: 0 !important;
                text-align: left !important;
            }
            .timeline-dot {
                left: 13px !important;
                right: auto !important;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group-full {
                grid-column: span 1;
            }
            .form-box {
                padding: 24px 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }