/* roulang page: index */
:root {
            --color-bg-dark: #0f1115;
            --color-bg-deep: #161920;
            --color-bg-card: #1e222b;
            --color-bg-light: #ffffff;
            --color-bg-subtle: #f6f8fb;
            --color-primary: #007aff;
            --color-primary-glow: rgba(0, 122, 255, 0.35);
            --color-text-white: #ffffff;
            --color-text-gray: #9ba3af;
            --color-text-dark: #111827;
            --color-text-muted: #6b7280;
            --color-border-dark: rgba(255, 255, 255, 0.08);
            --color-border-light: #e5e7eb;
            --color-accent-green: #10b981;
            --color-accent-amber: #f59e0b;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 20px 40px -15px rgba(0, 122, 255, 0.25);
        }

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

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--color-bg-dark);
            color: var(--color-text-white);
            line-height: 1.7;
            overflow-x: hidden;
        }

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

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

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部双行导航系统 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(15, 17, 21, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border-dark);
        }

        .nav-topbar {
            background: #090a0d;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.8125rem;
            color: var(--color-text-gray);
            padding: 6px 0;
        }

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

        .topbar-meta span {
            margin-right: 18px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .topbar-meta span::before {
            content: "";
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-accent-green);
        }

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

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

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--color-text-white);
        }

        .brand-badge {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--color-primary), #00c6ff);
            border-radius: 8px;
            display: grid;
            place-items: center;
            font-weight: 900;
            font-size: 1.1rem;
            box-shadow: 0 4px 12px var(--color-primary-glow);
        }

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

        .nav-links a {
            font-size: 0.95rem;
            color: #d1d5db;
            font-weight: 500;
            padding: 8px 4px;
            position: relative;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--color-text-white);
        }

        .nav-links a.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            font-size: 0.9375rem;
            font-weight: 600;
            cursor: pointer;
            border: 1px solid transparent;
            transition: var(--transition-smooth);
            text-align: center;
            gap: 8px;
            min-height: 48px;
        }

        .btn-primary {
            background-color: var(--color-primary);
            color: #ffffff;
            box-shadow: 0 4px 16px var(--color-primary-glow);
        }

        .btn-primary:hover {
            background-color: #0066d6;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px var(--color-primary-glow);
        }

        .btn-outline {
            border-color: rgba(255, 255, 255, 0.2);
            color: var(--color-text-white);
            background: rgba(255, 255, 255, 0.03);
        }

        .btn-outline:hover {
            border-color: var(--color-text-white);
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            min-height: 48px;
            min-width: 48px;
        }

        /* Section 通用规范 */
        section {
            padding: 96px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 60px;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.1em;
            text-transform: uppercase;
            margin-bottom: 12px;
            padding: 4px 12px;
            background: rgba(0, 122, 255, 0.1);
            border: 1px solid rgba(0, 122, 255, 0.2);
            border-radius: 20px;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            line-height: 1.25;
            color: #ffffff;
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }

        .section-subtitle {
            font-size: 1.0625rem;
            color: var(--color-text-gray);
            line-height: 1.7;
        }

        /* 1. Hero 蓝图：前后对比首屏 (Before/After) */
        .hero-section {
            padding: 80px 0 100px;
            background: radial-gradient(circle at 50% 10%, rgba(0, 122, 255, 0.12) 0%, transparent 60%),
                        linear-gradient(180deg, var(--color-bg-dark) 0%, #12141a 100%);
            border-bottom: 1px solid var(--color-border-dark);
        }

        .hero-content {
            text-align: center;
            max-width: 940px;
            margin: 0 auto 50px;
        }

        .hero-title {
            font-size: 3.25rem;
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 24px;
            background: linear-gradient(180deg, #ffffff 30%, #a5b4fc 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: #cbd5e1;
            line-height: 1.8;
            margin-bottom: 36px;
        }

        .hero-cta-group {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .hero-comparison-stage {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-top: 50px;
        }

        .compare-card {
            background: var(--color-bg-deep);
            border-radius: var(--radius-lg);
            padding: 36px;
            border: 1px solid var(--color-border-dark);
            position: relative;
            overflow: hidden;
        }

        .compare-card.before {
            border-color: rgba(239, 68, 68, 0.2);
            background: linear-gradient(180deg, rgba(239, 68, 68, 0.04) 0%, var(--color-bg-deep) 100%);
        }

        .compare-card.after {
            border-color: rgba(0, 122, 255, 0.4);
            background: linear-gradient(180deg, rgba(0, 122, 255, 0.06) 0%, var(--color-bg-deep) 100%);
            box-shadow: 0 10px 40px -10px rgba(0, 122, 255, 0.15);
        }

        .compare-badge {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            margin-bottom: 16px;
            letter-spacing: 0.05em;
        }

        .compare-card.before .compare-badge {
            background: rgba(239, 68, 68, 0.15);
            color: #ef4444;
        }

        .compare-card.after .compare-badge {
            background: rgba(0, 122, 255, 0.2);
            color: #38bdf8;
        }

        .compare-card h3 {
            font-size: 1.4rem;
            margin-bottom: 14px;
        }

        .compare-card p {
            color: var(--color-text-gray);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .compare-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .compare-list li {
            font-size: 0.9rem;
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: #e2e8f0;
        }

        .compare-list li span.dot-icon {
            font-size: 1rem;
            line-height: 1.4;
        }

        /* 2. KPI 看板区 */
        .kpi-section {
            background: #090a0d;
            padding: 60px 0;
            border-bottom: 1px solid var(--color-border-dark);
        }

        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .kpi-item {
            padding: 24px;
            background: rgba(255, 255, 255, 0.02);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.05);
            text-align: center;
        }

        .kpi-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: #ffffff;
            line-height: 1.1;
            margin-bottom: 8px;
            font-variant-numeric: tabular-nums;
        }

        .kpi-number span {
            color: var(--color-primary);
            font-size: 1.6rem;
        }

        .kpi-label {
            font-size: 0.875rem;
            color: var(--color-text-gray);
            font-weight: 500;
        }

        /* 3. 平台核心服务矩阵 */
        .matrix-section {
            background-color: var(--color-bg-dark);
        }

        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .matrix-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            position: relative;
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }

        .matrix-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 122, 255, 0.5);
            box-shadow: var(--shadow-hover);
        }

        .matrix-icon-box {
            width: 54px;
            height: 54px;
            background: rgba(0, 122, 255, 0.1);
            border-radius: var(--radius-md);
            display: grid;
            place-items: center;
            margin-bottom: 24px;
            color: var(--color-primary);
            font-size: 1.5rem;
            font-weight: bold;
            border: 1px solid rgba(0, 122, 255, 0.2);
        }

        .matrix-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: #fff;
        }

        .matrix-card p {
            color: var(--color-text-gray);
            font-size: 0.9375rem;
            line-height: 1.7;
            margin-bottom: 20px;
            flex-grow: 1;
        }

        .matrix-specs-tag {
            font-size: 0.75rem;
            color: #38bdf8;
            background: rgba(56, 189, 248, 0.1);
            padding: 4px 10px;
            border-radius: 4px;
            align-self: flex-start;
        }

        /* 4. 核心技术参数区 */
        .specs-section {
            background: var(--color-bg-deep);
            border-top: 1px solid var(--color-border-dark);
            border-bottom: 1px solid var(--color-border-dark);
        }

        .specs-table-wrapper {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-dark);
            overflow: hidden;
        }

        .specs-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .specs-table th,
        .specs-table td {
            padding: 20px 24px;
            border-bottom: 1px solid var(--color-border-dark);
            font-size: 0.9375rem;
        }

        .specs-table th {
            background: rgba(255, 255, 255, 0.03);
            color: #94a3b8;
            font-weight: 600;
            width: 25%;
        }

        .specs-table td {
            color: #e2e8f0;
        }

        .specs-table tr:last-child td,
        .specs-table tr:last-child th {
            border-bottom: none;
        }

        .highlight-param {
            color: var(--color-primary);
            font-weight: 700;
        }

        /* 5. 运动数据可视化区 */
        .vis-section {
            background: var(--color-bg-dark);
        }

        .vis-layout {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 48px;
            align-items: center;
        }

        .vis-image-container {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border-dark);
            box-shadow: var(--shadow-card);
            position: relative;
        }

        .vis-image-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .vis-image-container:hover img {
            transform: scale(1.02);
        }

        .vis-info h2 {
            font-size: 2.1rem;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        .vis-info p {
            color: var(--color-text-gray);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .vis-features {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .vis-feat-item {
            display: flex;
            gap: 16px;
        }

        .vis-feat-icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            background: rgba(0, 122, 255, 0.15);
            border-radius: 50%;
            display: grid;
            place-items: center;
            color: var(--color-primary);
            font-weight: bold;
        }

        .vis-feat-text h4 {
            font-size: 1rem;
            margin-bottom: 4px;
            color: #ffffff;
        }

        .vis-feat-text p {
            font-size: 0.875rem;
            color: var(--color-text-gray);
            margin-bottom: 0;
        }

        /* 6. 智能穿戴应用场景区 */
        .scenarios-section {
            background: #11141a;
            border-top: 1px solid var(--color-border-dark);
        }

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

        .scenario-card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border-dark);
            transition: var(--transition-smooth);
        }

        .scenario-card:hover {
            transform: translateY(-6px);
            border-color: rgba(255, 255, 255, 0.2);
        }

        .scenario-thumb {
            height: 220px;
            overflow: hidden;
            position: relative;
        }

        .scenario-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .scenario-card:hover .scenario-thumb img {
            transform: scale(1.05);
        }

        .scenario-body {
            padding: 28px;
        }

        .scenario-body h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: #fff;
        }

        .scenario-body p {
            color: var(--color-text-gray);
            font-size: 0.9375rem;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .scenario-metrics {
            display: flex;
            justify-content: space-between;
            padding-top: 16px;
            border-top: 1px solid var(--color-border-dark);
            font-size: 0.8125rem;
            color: #cbd5e1;
        }

        /* 7. 深色案例墙 (实测对比结果) */
        .case-section {
            background: var(--color-bg-dark);
            border-top: 1px solid var(--color-border-dark);
        }

        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: linear-gradient(180deg, #181c24 0%, #12151c 100%);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius-lg);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .case-top h4 {
            font-size: 1.25rem;
            color: #fff;
            margin-bottom: 12px;
        }

        .case-top p {
            font-size: 0.9375rem;
            color: var(--color-text-gray);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .case-stat-box {
            background: rgba(0, 0, 0, 0.25);
            border-radius: var(--radius-sm);
            padding: 16px;
            border-left: 3px solid var(--color-primary);
        }

        .case-stat-value {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--color-accent-green);
            line-height: 1.2;
        }

        .case-stat-desc {
            font-size: 0.8125rem;
            color: #94a3b8;
            margin-top: 4px;
        }

        /* 8. 平台进化里程碑 */
        .milestone-section {
            background: var(--color-bg-deep);
            border-top: 1px solid var(--color-border-dark);
        }

        .milestone-track {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .milestone-track::before {
            content: "";
            position: absolute;
            top: 24px;
            left: 0;
            right: 0;
            height: 2px;
            background: rgba(255, 255, 255, 0.1);
            z-index: 1;
        }

        .milestone-card {
            position: relative;
            z-index: 2;
            padding-top: 16px;
        }

        .milestone-dot {
            width: 18px;
            height: 18px;
            background: var(--color-primary);
            border: 4px solid var(--color-bg-deep);
            border-radius: 50%;
            margin-bottom: 20px;
            box-shadow: 0 0 10px var(--color-primary);
        }

        .milestone-year {
            font-size: 1.25rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 8px;
        }

        .milestone-card h4 {
            font-size: 1rem;
            color: #cbd5e1;
            margin-bottom: 8px;
        }

        .milestone-card p {
            font-size: 0.875rem;
            color: var(--color-text-gray);
            line-height: 1.6;
        }

        /* 9. 智能穿戴专业评价区 */
        .testimonial-section {
            background: var(--color-bg-dark);
            border-top: 1px solid var(--color-border-dark);
        }

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

        .testimonial-card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-dark);
            padding: 32px;
            position: relative;
        }

        .testimonial-quote {
            font-size: 0.95rem;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .testimonial-user {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .user-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var--color-border-dark);
}

.user-info h5 {
    font-size: 1rem;
    color: #fff;
    margin-bottom: 2px;
}

.user-info span {
    font-size: 0.8125rem;
    color: var(--color-primary);
}

/* 11. 行业资讯摘要 */
.news-section {
    background: #090a0d;
}

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

.news-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-dark);
    padding: 24px;
    border-radius: var(--radius-md);
    transition: var(--transition-smooth);
}

.news-card:hover {
    border-color: var(--color-primary);
}

.news-date {
    font-size: 0.8125rem;
    color: var(--color-text-gray);
    margin-bottom: 12px;
}

.news-card h4 {
    font-size: 1.125rem;
    margin-bottom: 12px;
    color: #fff;
}

/* 12. FAQ */
.faq-section {
    background: var(--color-bg-dark);
    border-top: 1px solid var(--color-border-dark);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 16px;
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-q {
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.faq-a {
    padding: 0 20px 20px;
    color: var(--color-text-gray);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* 14. Footer */
.site-footer {
    background: #050505;
    padding: 60px 0 30px;
    border-top: 1px solid var(--color-border-dark);
    color: var(--color-text-gray);
    font-size: 0.875rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: #fff;
    margin-bottom: 16px;
}

.footer-links h4 {
    color: #fff;
    margin-bottom: 16px;
}

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

.footer-links ul li {
    margin-bottom: 8px;
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .matrix-grid, .scenario-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .matrix-grid, .scenario-grid, .case-grid, .kpi-grid, .news-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; }
    .mobile-menu-toggle { display: block; }
    .hero-comparison-stage { grid-template-columns: 1fr; }
}