/* roulang page: index */
:root {
            --brand-green: #00F59B;
            --brand-green-hover: #00D687;
            --brand-green-muted: rgba(0, 245, 155, 0.12);
            --dark-core: #0B0F17;
            --dark-card: #151D2A;
            --dark-border: rgba(255, 255, 255, 0.08);
            --dark-text-muted: #8E9BAE;
            --light-bg: #F8FAFC;
            --light-card: #FFFFFF;
            --light-border: rgba(15, 23, 42, 0.08);
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-radius-main: 16px;
            --shadow-subtle: 0 16px 36px -12px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 24px 48px -10px rgba(15, 23, 42, 0.12);
            --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

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

        body {
            font-family: Inter, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
            background-color: var(--light-bg);
            color: var(--text-main);
            line-height: 1.6;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

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

        /* 顶部通栏实用条 */
        .top-utility-bar {
            background-color: #070B10;
            color: #94A3B8;
            font-size: 0.82rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding: 7px 0;
        }
        .top-utility-bar .badge-sync {
            background-color: rgba(0, 245, 155, 0.15);
            color: var(--brand-green);
            font-size: 0.72rem;
            padding: 2px 8px;
            border-radius: 20px;
            font-weight: 500;
        }

        /* 主固定导航条 */
        .main-sticky-header {
            position: sticky;
            top: 0;
            z-index: 1040;
            background: rgba(11, 15, 23, 0.94);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--dark-border);
            padding: 12px 0;
            transition: var(--transition-smooth);
        }
        .navbar-brand-logo {
            font-weight: 800;
            font-size: 1.35rem;
            color: #FFFFFF;
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .navbar-brand-logo span.dot {
            color: var(--brand-green);
        }
        .main-sticky-header .nav-link {
            color: #CBD5E1;
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 14px !important;
            border-radius: 8px;
            transition: var(--transition-smooth);
        }
        .main-sticky-header .nav-link:hover {
            color: var(--brand-green);
        }
        .btn-header-cta {
            background-color: var(--brand-green);
            color: #0B0F17;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 8px 22px;
            border-radius: 30px;
            border: none;
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .btn-header-cta:hover {
            background-color: var(--brand-green-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 245, 155, 0.3);
            color: #000000;
        }

        /* 移动端底部 Tab 导航 */
        .mobile-bottom-tabs {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            border-top: 1px solid rgba(0, 0, 0, 0.08);
            z-index: 1050;
            display: flex;
            align-items: center;
            justify-content: space-around;
            padding: 0 10px;
            box-shadow: 0 -4px 18px rgba(0, 0, 0, 0.04);
        }
        .mobile-tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 0.72rem;
            font-weight: 500;
            text-decoration: none;
            flex: 1;
        }
        .mobile-tab-item i {
            font-size: 1.15rem;
            margin-bottom: 2px;
        }
        .mobile-tab-item.active,
        .mobile-tab-item:hover {
            color: #0F172A;
            font-weight: 700;
        }
        .mobile-tab-item.active i {
            color: #059669;
        }

        /* 通用板块与排版 */
        .section-padding {
            padding: clamp(4.5rem, 7vw, 7.5rem) 0;
            position: relative;
        }
        .section-badge {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }
        .badge-dark-variant {
            background: rgba(0, 245, 155, 0.12);
            color: var(--brand-green);
            border: 1px solid rgba(0, 245, 155, 0.25);
        }
        .badge-light-variant {
            background: #E2E8F0;
            color: #334155;
            border: 1px solid #CBD5E1;
        }
        .section-title {
            font-size: clamp(2rem, 3.5vw, 2.75rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 20px;
        }
        .section-desc {
            font-size: 1.05rem;
            line-height: 1.75;
            color: var(--text-muted);
            max-width: 780px;
        }

        /* 沉浸暗底 Hero 板块 */
        .hero-section {
            position: relative;
            background-color: var(--dark-core);
            color: #FFFFFF;
            padding: clamp(5rem, 8vw, 8.5rem) 0 clamp(4rem, 6vw, 6.5rem);
            overflow: hidden;
            background-image: linear-gradient(180deg, rgba(11, 15, 23, 0.85) 0%, rgba(11, 15, 23, 0.98) 100%), url('/assets/images/d285f6a203a176ea.jpg');
            background-size: cover;
            background-position: center;
        }
        .hero-poster-frame {
            position: relative;
            border-radius: var(--border-radius-main);
            overflow: hidden;
            border: 1px solid var(--dark-border);
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
        }
        .hero-poster-frame img {
            width: 100%;
            height: 480px;
            object-fit: cover;
            transition: transform 0.8s ease;
        }
        .hero-poster-frame:hover img {
            transform: scale(1.03);
        }
        .hero-heat-tag {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(11, 15, 23, 0.85);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #FFFFFF;
            font-size: 0.85rem;
            font-weight: 700;
            padding: 6px 14px;
            border-radius: 30px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hero-heat-tag i {
            color: #EF4444;
        }
        .hero-hud-card {
            position: absolute;
            bottom: 24px;
            left: 24px;
            right: 24px;
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 12px;
            padding: 16px;
            display: flex;
            justify-content: space-around;
        }
        .hero-hud-stat {
            text-align: center;
        }
        .hero-hud-stat .val {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--brand-green);
            line-height: 1.1;
        }
        .hero-hud-stat .lbl {
            font-size: 0.72rem;
            color: #94A3B8;
            margin-top: 4px;
        }

        /* 痛点卡片区 */
        .painpoint-card {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            padding: 2.2rem;
            height: 100%;
            position: relative;
            transition: var(--transition-smooth);
            box-shadow: var(--shadow-subtle);
        }
        .painpoint-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .painpoint-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background-color: #EF4444;
            border-top-left-radius: var(--border-radius-main);
            border-bottom-left-radius: var(--border-radius-main);
        }
        .painpoint-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: #FEE2E2;
            color: #DC2626;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }

        /* 解决方案架构区 */
        .architecture-banner {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }
        .architecture-img-wrap {
            height: 100%;
            min-height: 380px;
            position: relative;
        }
        .architecture-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .architecture-body {
            padding: clamp(2rem, 4vw, 3.5rem);
        }
        .step-pill-list {
            list-style: none;
            padding: 0;
            margin: 1.5rem 0 0;
        }
        .step-pill-list li {
            padding: 12px 16px;
            background: #F1F5F9;
            border-radius: 10px;
            margin-bottom: 10px;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 500;
        }
        .step-pill-list li i {
            color: #059669;
        }

        /* 矩阵卡片 (优势矩阵) */
        .advantage-card {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            padding: 2.2rem;
            height: 100%;
            transition: var(--transition-smooth);
            box-shadow: var(--shadow-subtle);
        }
        .advantage-card:hover {
            transform: translateY(-5px);
            border-color: rgba(16, 185, 129, 0.4);
            box-shadow: var(--shadow-hover);
        }
        .advantage-icon-box {
            width: 58px;
            height: 58px;
            border-radius: 14px;
            background: var(--brand-green-muted);
            color: #059669;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }

        /* 穿戴设备展示卡 */
        .device-card {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            overflow: hidden;
            transition: var(--transition-smooth);
            height: 100%;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-subtle);
        }
        .device-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .device-thumb {
            height: 240px;
            position: relative;
            background: #E2E8F0;
            overflow: hidden;
        }
        .device-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .device-card:hover .device-thumb img {
            transform: scale(1.05);
        }
        .device-card-content {
            padding: 1.8rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .device-spec-tag {
            font-size: 0.75rem;
            background: #F1F5F9;
            color: #475569;
            padding: 4px 10px;
            border-radius: 6px;
            margin-right: 6px;
            margin-bottom: 6px;
            display: inline-block;
        }

        /* 优惠阶梯与权益 */
        .ladder-tier-card {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            padding: 2.5rem 2rem;
            position: relative;
            transition: var(--transition-smooth);
            height: 100%;
            box-shadow: var(--shadow-subtle);
        }
        .ladder-tier-card.featured {
            border: 2px solid #10B981;
            box-shadow: 0 20px 45px -10px rgba(16, 185, 129, 0.18);
        }
        .badge-ladder-featured {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: #10B981;
            color: #FFFFFF;
            font-size: 0.78rem;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: 20px;
            letter-spacing: 0.5px;
        }
        .ladder-price {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0F172A;
            margin: 1.2rem 0;
            display: flex;
            align-items: baseline;
            gap: 4px;
        }
        .ladder-price span.unit {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 四步流程图 */
        .step-timeline-item {
            position: relative;
            padding: 2rem 1.5rem;
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            height: 100%;
            transition: var(--transition-smooth);
        }
        .step-timeline-item:hover {
            border-color: #00D687;
            transform: translateY(-4px);
        }
        .step-number-big {
            font-size: 3rem;
            font-weight: 900;
            color: rgba(15, 23, 42, 0.08);
            line-height: 1;
            margin-bottom: 0.8rem;
            font-family: Inter, monospace;
        }

        /* 硬核数据指标条 (全宽深色) */
        .metrics-fullwidth-strip {
            background-color: var(--dark-core);
            color: #FFFFFF;
            padding: clamp(4.5rem, 6vw, 6.5rem) 0;
            border-top: 1px solid var(--dark-border);
            border-bottom: 1px solid var(--dark-border);
        }
        .metric-item-num {
            font-size: clamp(2.5rem, 4vw, 3.5rem);
            font-weight: 800;
            color: var(--brand-green);
            line-height: 1.1;
            letter-spacing: -1px;
        }
        .metric-item-label {
            font-size: 0.95rem;
            color: #94A3B8;
            margin-top: 8px;
            font-weight: 500;
        }

        /* 评价墙与客户故事 */
        .testimonial-bubble {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            padding: 2.2rem;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: var(--shadow-subtle);
        }
        .quote-icon {
            font-size: 2.2rem;
            color: #CBD5E1;
            line-height: 1;
            margin-bottom: 1rem;
        }
        .client-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid #E2E8F0;
        }

        /* 保障图标条 */
        .guarantee-box {
            text-align: center;
            padding: 1.8rem 1.2rem;
            background: #F8FAFC;
            border-radius: 12px;
            border: 1px solid var(--light-border);
            transition: var(--transition-smooth);
        }
        .guarantee-box:hover {
            background: #FFFFFF;
            box-shadow: var(--shadow-subtle);
        }
        .guarantee-box i {
            font-size: 2.2rem;
            color: #10B981;
            margin-bottom: 1rem;
        }

        /* 运动科研理念 (深色叙事) */
        .philosophy-strip {
            background: #111827;
            color: #FFFFFF;
            padding: clamp(4.5rem, 7vw, 7.5rem) 0;
        }
        .philosophy-strip .lead {
            color: #94A3B8;
            line-height: 1.8;
            font-size: 1.15rem;
        }

        /* 资讯与白皮书 */
        .news-card {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: var(--border-radius-main);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-subtle);
            transition: var(--transition-smooth);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .news-thumb {
            height: 200px;
            overflow: hidden;
            background: #E2E8F0;
        }
        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .news-card:hover .news-thumb img {
            transform: scale(1.05);
        }
        .news-content {
            padding: 1.8rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        /* FAQ 手风琴深度定制 */
        .custom-accordion .accordion-item {
            background: #FFFFFF;
            border: 1px solid var(--light-border);
            border-radius: 12px !important;
            margin-bottom: 14px;
            overflow: hidden;
        }
        .custom-accordion .accordion-button {
            background: #FFFFFF;
            color: #0F172A;
            font-weight: 700;
            font-size: 1.05rem;
            padding: 1.25rem 1.5rem;
            box-shadow: none !important;
        }
        .custom-accordion .accordion-button:not(.collapsed) {
            background: #F8FAFC;
            color: #059669;
        }
        .custom-accordion .accordion-body {
            padding: 1.25rem 1.5rem 1.75rem;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* 转化收口区 (CTA) */
        .cta-closure-block {
            background: linear-gradient(135deg, #0B0F17 0%, #151D2A 100%);
            border-radius: 24px;
            padding: clamp(3rem, 6vw, 5.5rem) clamp(1.5rem, 4vw, 4rem);
            color: #FFFFFF;
            border: 1px solid var(--dark-border);
            position: relative;
            overflow: hidden;
        }
        .form-control-tech {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #FFFFFF;
            border-radius: 10px;
            padding: 12px 18px;
            font-size: 0.95rem;
        }
        .form-control-tech:focus {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--brand-green);
            box-shadow: 0 0 0 3px rgba(0, 245, 155, 0.2);
            color: #FFFFFF;
        }
        .form-control-tech::placeholder {
            color: #64748B;
        }

        /* 页脚 */
        .site-footer {
            background: #070A0F;
            color: #94A3B8;
            padding: 5rem 0 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.9rem;
        }
        .site-footer h5 {
            color: #FFFFFF;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 0.8rem;
        }
        .site-footer ul li a:hover {
            color: var(--brand-green);
        }
        .footer-bottom-line {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-top: 4rem;
            padding-top: 2rem;
            font-size: 0.82rem;
            color: #64748B;
        }

        /* 响应式调整 */
        @media (max-width: 991.98px) {
            .hero-poster-frame img {
                height: 380px;
            }
        }
        @media (max-width: 767.98px) {
            body {
                padding-bottom: 70px; /* 给底部 Tab 留空 */
            }
            .hero-poster-frame img {
                height: 300px;
            }
            .hero-hud-card {
                padding: 10px;
            }
            .hero-hud-stat .val {
                font-size: 1.1rem;
            }
        }