/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary: #10B981;
      --primary-glow: #00F59B;
      --bg-dark: #0F172A;
      --bg-darker: #020617;
      --bg-card: #1E293B;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(0, 245, 155, 0.3);
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-light: #CBD5E1;
      --accent-orange: #F97316;
      --container-max: 1280px;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-full: 9999px;
      --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 0 25px rgba(0, 245, 155, 0.2);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-light);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

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

    /* 顶部信息条 */
    .top-bar {
      background: var(--bg-darker);
      border-bottom: 1px solid var(--border-color);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary-glow);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-glow);
    }

    /* 主导航栏 */
    .main-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-wrap {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .logo-symbol {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary), var(--primary-glow));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bg-darker);
      font-weight: 900;
      font-size: 1.125rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary-glow);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      border-radius: var(--radius-full);
      font-size: 0.9375rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #020617;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
    }
    .btn-primary:hover {
      background: var(--primary-glow);
      transform: translateY(-2px);
      box-shadow: var(--shadow-glow);
    }
    .btn-outline {
      background: transparent;
      border-color: rgba(255, 255, 255, 0.2);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--text-main);
      background: rgba(255, 255, 255, 0.05);
      transform: translateY(-2px);
    }

    /* 板块排版通用定义 */
    .section {
      padding: 96px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-darker);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.center {
      text-align: center;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 56px;
    }
    .sub-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary-glow);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: clamp(1.75rem, 3.2vw, 2.375rem);
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 1: 全宽浅底/矮横幅首屏 (Hero) */
    .hero-strip {
      background: linear-gradient(180deg, #1E293B 0%, var(--bg-dark) 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 64px 0 72px;
      position: relative;
      overflow: hidden;
    }
    .hero-strip::after {
      content: "";
      position: absolute;
      top: -50%;
      right: 10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0, 245, 155, 0.1) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-title {
      font-size: clamp(2.25rem, 4.5vw, 3.75rem);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.15;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(90deg, #FFFFFF, var(--primary-glow));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-p {
      font-size: 1.125rem;
      color: var(--text-light);
      line-height: 1.75;
      margin-bottom: 32px;
      max-width: 640px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 28px;
    }
    .hero-tags {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .hero-tag-item {
      font-size: 0.8125rem;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      color: var(--text-muted);
    }
    .hero-cover-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-subtle);
    }
    .hero-cover-wrap img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      transition: transform 0.6s ease;
    }
    .hero-cover-wrap:hover img {
      transform: scale(1.03);
    }

    /* 板块 2: 传统运动痛点 (Pain Points) */
    .pain-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: rgba(30, 41, 59, 0.4);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      position: relative;
      transition: var(--transition);
    }
    .pain-card:hover {
      border-color: rgba(249, 115, 22, 0.4);
      transform: translateY(-4px);
    }
    .pain-indicator {
      display: inline-block;
      padding: 4px 10px;
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent-orange);
      font-size: 0.75rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
    }
    .pain-card h3 {
      font-size: 1.25rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .pain-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 3: 架构演进与前沿方案 (Core Architecture) */
    .arch-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-content h3 {
      font-size: 1.5rem;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .arch-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 24px;
    }
    .arch-item {
      display: flex;
      gap: 16px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }
    .arch-item:hover {
      border-color: var(--primary-glow);
    }
    .arch-num {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-glow);
    }
    .arch-item-text h4 {
      font-size: 1.0625rem;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .arch-item-text p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* 板块 4: 核心六维功能优势网格 (Key Advantages) */
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      transition: var(--transition);
      position: relative;
    }
    .adv-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    }
    .adv-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(16, 185, 129, 0.1);
      color: var(--primary-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 1.1875rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .adv-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 5: 三大核心终端矩阵 (Product Showcase) */
    .terminal-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .terminal-card {
      background: linear-gradient(180deg, #1E293B 0%, var(--bg-darker) 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .terminal-card:hover {
      border-color: var(--primary);
    }
    .terminal-tag {
      font-size: 0.75rem;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      padding: 4px 10px;
      border-radius: var(--radius-full);
      display: inline-block;
      margin-bottom: 16px;
      color: var(--primary-glow);
    }
    .terminal-card h3 {
      font-size: 1.3125rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .terminal-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .terminal-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .terminal-features li {
      font-size: 0.875rem;
      color: var(--text-light);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .terminal-features li::before {
      content: "•";
      color: var(--primary-glow);
      font-size: 1.25rem;
    }

    /* 板块 6: 技术壁垒与可信认证 (Tech Standards) */
    .standards-container {
      background: var(--bg-darker);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 48px;
      position: relative;
    }
    .standards-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 36px;
    }
    .std-item {
      border-left: 2px solid var(--primary);
      padding-left: 16px;
    }
    .std-value {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
      font-family: monospace;
    }
    .std-label {
      font-size: 0.875rem;
      color: var(--primary-glow);
      font-weight: 600;
      margin-bottom: 6px;
    }
    .std-desc {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块 7: 全流程约战撮合闭环 (Workflow) */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }
    .flow-index {
      font-size: 2.25rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.06);
      line-height: 1;
      margin-bottom: 12px;
    }
    .flow-step-card h3 {
      font-size: 1.125rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .flow-step-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* 板块 8: 平台实时运营度量横幅 (Metric Dashboard) */
    .metric-strip {
      background: linear-gradient(90deg, #10B981 0%, #0F172A 100%);
      border-radius: var(--radius-lg);
      padding: 48px;
      color: #FFFFFF;
    }
    .metric-flex {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-num {
      font-size: clamp(2rem, 3.5vw, 3rem);
      font-weight: 900;
      letter-spacing: -1px;
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-desc {
      font-size: 0.9375rem;
      opacity: 0.85;
      font-weight: 500;
    }

    /* 板块 9: 运动社群故事 (User Stories Showcase) */
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .story-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .story-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .story-body {
      padding: 32px;
    }
    .story-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary-glow);
      text-transform: uppercase;
      margin-bottom: 8px;
      display: inline-block;
    }
    .story-body h3 {
      font-size: 1.375rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .story-body p {
      font-size: 0.9375rem;
      color: var(--text-light);
      margin-bottom: 20px;
      line-height: 1.7;
    }
    .story-author {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.875rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    /* 板块 10: 多维度运动者可信评价 (Testimonials) */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .review-rating {
      color: #EAB308;
      font-size: 0.875rem;
      margin-bottom: 12px;
      letter-spacing: 2px;
    }
    .review-card blockquote {
      font-size: 0.9375rem;
      color: var(--text-light);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-avatar {
      width: 42px;
      height: 42px;
      background: #334155;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary-glow);
      border: 1px solid var(--border-color);
    }
    .user-info h4 {
      font-size: 0.9375rem;
      color: var(--text-main);
    }
    .user-info span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 板块 11: 运动指南与行业动态 (Insights) */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .insight-card {
      background: rgba(30, 41, 59, 0.4);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .insight-card:hover {
      border-color: var(--primary-glow);
      transform: translateY(-3px);
    }
    .insight-meta {
      font-size: 0.75rem;
      color: var(--primary-glow);
      margin-bottom: 8px;
    }
    .insight-card h3 {
      font-size: 1.1875rem;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .insight-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.65;
    }
    .insight-link {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .insight-link:hover {
      color: var(--primary-glow);
    }

    /* 板块 12: 常见疑虑权威解答 (FAQ) */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-item summary {
      padding: 22px 28px;
      cursor: pointer;
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      user-select: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 1.25rem;
      color: var(--primary-glow);
      font-weight: 400;
      transition: transform 0.3s ease;
    }
    .faq-item[open] summary::after {
      transform: rotate(45deg);
    }
    .faq-content {
      padding: 0 28px 24px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.75;
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      margin-top: 4px;
      padding-top: 16px;
    }

    /* 全局高转化行动收口 (CTA) */
    .cta-container {
      background: radial-gradient(circle at 50% 0%, #1E293B 0%, var(--bg-darker) 100%);
      border: 1px solid rgba(0, 245, 155, 0.2);
      border-radius: var(--radius-lg);
      padding: 64px 32px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-glow);
    }
    .cta-form {
      display: flex;
      max-width: 520px;
      margin: 32px auto 0;
      gap: 12px;
      background: rgba(15, 23, 42, 0.8);
      padding: 6px;
      border-radius: var(--radius-full);
      border: 1px solid var(--border-color);
    }
    .cta-input {
      flex: 1;
      background: transparent;
      border: none;
      padding: 12px 20px;
      color: var(--text-main);
      font-size: 0.9375rem;
    }
    .cta-input::placeholder {
      color: var(--text-muted);
    }

    /* 综合页脚 */
    .site-footer {
      background: var(--bg-darker);
      border-top: 1px solid var(--border-color);
      padding: 80px 0 32px;
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 64px;
    }
    .footer-brand h4 {
      font-size: 1.25rem;
      color: var(--text-main);
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-col h5 {
      font-size: 0.9375rem;
      color: var(--text-main);
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-col a:hover {
      color: var(--primary-glow);
    }
    .footer-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .footer-tag {
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }
    .footer-verify {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-wrap, .stories-grid {
        grid-template-columns: 1fr;
      }
      .grid-6, .terminal-grid, .reviews-grid, .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .standards-grid, .flow-steps, .metric-flex {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        display: none;
      }
      .section {
        padding: 64px 0;
      }
      .pain-cards, .grid-6, .terminal-grid, .reviews-grid, .insights-grid, .flow-steps, .standards-grid, .metric-flex {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .cta-form {
        flex-direction: column;
        border-radius: var(--radius-md);
      }
      .cta-form .btn {
        width: 100%;
      }
    }