/* roulang page: index */
:root {
      --primary-navy: #0F2B48;
      --navy-dark: #081626;
      --accent-cyan: #00D2B4;
      --cyan-light: #e0faf5;
      --cyan-hover: #00b89e;
      --bg-light: #F4F8FA;
      --bg-white: #ffffff;
      --text-main: #1A202C;
      --text-muted: #5A6A80;
      --border-color: #E2E8F0;
      --border-light: rgba(226, 232, 240, 0.8);
      --card-shadow: 0 4px 20px rgba(15, 43, 72, 0.05);
      --card-shadow-hover: 0 14px 32px rgba(15, 43, 72, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.25s ease;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      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;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部信息栏 */
    .top-bar {
      background-color: var(--navy-dark);
      color: #94A3B8;
      font-size: 13px;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 6px var(--accent-cyan);
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-navy);
      letter-spacing: -0.5px;
    }
    .brand-icon-box {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary-navy), #1D4ED8);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-weight: 800;
      font-size: 18px;
    }
    .brand-badge {
      font-size: 11px;
      background: var(--cyan-light);
      color: var(--primary-navy);
      padding: 2px 7px;
      border-radius: 10px;
      font-weight: 600;
      margin-left: 4px;
    }
    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-navy);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-cyan);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-cta-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background-color: var(--accent-cyan);
      color: var(--navy-dark);
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--accent-cyan);
      box-shadow: 0 4px 14px rgba(0, 210, 180, 0.25);
    }
    .nav-cta-btn:hover {
      background-color: var(--cyan-hover);
      transform: translateY(-1px);
    }
    .nav-toggle-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary-navy);
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      text-align: center;
      line-height: 1.4;
      border: 1px solid transparent;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--accent-cyan);
      color: var(--navy-dark);
      box-shadow: 0 6px 20px rgba(0, 210, 180, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--cyan-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 210, 180, 0.4);
    }
    .btn-outline {
      background-color: transparent;
      border-color: rgba(255, 255, 255, 0.4);
      color: #ffffff;
    }
    .btn-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #ffffff;
      transform: translateY(-2px);
    }
    .btn-navy {
      background-color: var(--primary-navy);
      color: #ffffff;
    }
    .btn-navy:hover {
      background-color: var(--navy-dark);
      transform: translateY(-2px);
    }

    /* Section 通用规范 */
    section {
      padding: 85px 0;
      position: relative;
    }
    .bg-light-sec {
      background-color: var(--bg-light);
    }
    .bg-dark-sec {
      background-color: var(--navy-dark);
      color: #F8FAFC;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }
    .sub-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-navy);
      background-color: var(--cyan-light);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 14px;
    }
    .bg-dark-sec .sub-tag {
      background-color: rgba(0, 210, 180, 0.15);
      color: var(--accent-cyan);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-navy);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .bg-dark-sec .section-title {
      color: #ffffff;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.75;
    }
    .bg-dark-sec .section-desc {
      color: #94A3B8;
    }

    /* 1. 首屏 Hero Banner */
    .hero-section {
      position: relative;
      padding: 100px 0 110px;
      background: linear-gradient(135deg, rgba(8, 22, 38, 0.94) 0%, rgba(15, 43, 72, 0.92) 100%),
                  url('/assets/images/3db06b8c44fcba32.webp') center/cover no-repeat;
      color: #ffffff;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      color: var(--accent-cyan);
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 34px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding-top: 24px;
    }
    .hero-highlight-item {
      font-size: 13px;
      color: #94A3B8;
    }
    .hero-highlight-item strong {
      display: block;
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .hero-dashboard-mockup {
      background: rgba(15, 43, 72, 0.8);
      border: 1px solid rgba(0, 210, 180, 0.3);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      position: relative;
    }
    .mockup-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      margin-bottom: 18px;
      font-size: 14px;
      font-weight: 600;
    }
    .live-pulse {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent-cyan);
      font-size: 12px;
    }
    .lane-status-row {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .lane-bar-item {
      background: rgba(255, 255, 255, 0.05);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 3px solid var(--accent-cyan);
    }
    .lane-name {
      font-size: 14px;
      font-weight: 600;
      color: #ffffff;
    }
    .lane-metrics {
      font-size: 12px;
      color: #CBD5E1;
      text-align: right;
    }

    /* 2. 架构与硬核参数介绍 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .arch-img-wrap img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .spec-card {
      background: #ffffff;
      border-radius: var(--radius-sm);
      padding: 18px 20px;
      margin-bottom: 14px;
      border: 1px solid var(--border-color);
      border-left: 4px solid var(--primary-navy);
      transition: var(--transition);
    }
    .spec-card:hover {
      border-left-color: var(--accent-cyan);
      box-shadow: var(--card-shadow);
      transform: translateX(4px);
    }
    .spec-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 6px;
    }
    .spec-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .verified-pill {
      display: inline-block;
      font-size: 12px;
      color: #0369a1;
      background: #e0f2fe;
      padding: 2px 8px;
      border-radius: 4px;
      margin-top: 6px;
      font-weight: 500;
    }

    /* 3. 核心优势 6 卡片网格 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 32px 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .feature-icon-badge {
      width: 48px;
      height: 48px;
      background-color: var(--cyan-light);
      color: var(--primary-navy);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .feature-foot {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    /* 4. 软硬件方案对比 */
    .plans-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .plan-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 36px 30px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }
    .plan-card.featured {
      border-color: var(--accent-cyan);
      box-shadow: 0 12px 35px rgba(0, 210, 180, 0.15);
      transform: scale(1.02);
    }
    .plan-card:hover {
      box-shadow: var(--card-shadow-hover);
    }
    .plan-badge {
      position: absolute;
      top: 18px;
      right: 20px;
      background: var(--accent-cyan);
      color: var(--navy-dark);
      font-size: 11px;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 12px;
    }
    .plan-name {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 8px;
    }
    .plan-sub {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 38px;
    }
    .plan-features-list {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .plan-features-list li {
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 12px;
      position: relative;
      padding-left: 22px;
    }
    .plan-features-list li::before {
      content: '✓';
      position: absolute;
      left: 0;
      color: var(--accent-cyan);
      font-weight: 800;
    }

    /* 5. 数字化训练功能 Z字排版 */
    .z-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 70px;
    }
    .z-row:last-child {
      margin-bottom: 0;
    }
    .z-row.reverse {
      direction: rtl;
    }
    .z-row.reverse > * {
      direction: ltr;
    }
    .z-media {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
    }
    .z-media img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }
    .z-text h3 {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 16px;
    }
    .z-text p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }
    .z-points {
      list-style: none;
      margin-bottom: 24px;
    }
    .z-points li {
      font-size: 14px;
      margin-bottom: 10px;
      padding-left: 20px;
      position: relative;
      color: var(--text-main);
    }
    .z-points li::before {
      content: '•';
      position: absolute;
      left: 6px;
      color: var(--accent-cyan);
      font-size: 18px;
    }

    /* 6. 应用场景矩阵 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scenario-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .scenario-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-3px);
    }
    .scenario-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary-navy);
      background: var(--bg-light);
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .scenario-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 10px;
    }
    .scenario-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 界面演示与交互热点 */
    .screen-stage {
      background: #0F172A;
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
      position: relative;
    }
    .screen-header-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 18px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .dot-circle {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background-color: #EF4444;
    }
    .dot-circle:nth-child(2) { background-color: #F59E0B; }
    .dot-circle:nth-child(3) { background-color: #10B981; }
    .screen-inner-content {
      position: relative;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .screen-inner-content img {
      width: 100%;
      height: 480px;
      object-fit: cover;
    }
    .hotspots-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .hotspot-box {
      background: rgba(255, 255, 255, 0.06);
      border-radius: var(--radius-sm);
      padding: 16px;
      border-left: 3px solid var(--accent-cyan);
      color: #CBD5E1;
      font-size: 13px;
    }
    .hotspot-box strong {
      display: block;
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 4px;
    }

    /* 8. 深色科研理念区 */
    .dark-sci-inner {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .biomech-card-group {
      display: grid;
      grid-template-columns: 1fr;
      gap: 16px;
    }
    .biomech-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-sm);
      padding: 20px;
    }
    .biomech-box h4 {
      font-size: 16px;
      color: var(--accent-cyan);
      margin-bottom: 6px;
    }
    .biomech-box p {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* 9. 客户故事案例 */
    .story-card-wrapper {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
    }
    .story-img-box img {
      width: 100%;
      height: 100%;
      min-height: 380px;
      object-fit: cover;
    }
    .story-content {
      padding: 44px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-quote {
      font-size: 18px;
      font-weight: 600;
      color: var(--primary-navy);
      line-height: 1.6;
      margin-bottom: 20px;
      position: relative;
    }
    .story-author {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 10px;
    }
    .story-author-info h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary-navy);
    }
    .story-author-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 10. 数据度量条 */
    .metrics-bar {
      background: linear-gradient(90deg, #081626 0%, #0F2B48 100%);
      color: #ffffff;
      padding: 60px 0;
      border-top: 1px solid rgba(0, 210, 180, 0.2);
      border-bottom: 1px solid rgba(0, 210, 180, 0.2);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .metric-item {
      padding: 10px;
    }
    .metric-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1.1;
      margin-bottom: 8px;
      letter-spacing: -1px;
    }
    .metric-number span {
      font-size: 20px;
      font-weight: 600;
      color: #ffffff;
    }
    .metric-label {
      font-size: 14px;
      color: #94A3B8;
      font-weight: 500;
    }

    /* 11. 评价瀑布流 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #F59E0B;
      font-size: 15px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .review-user {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .reviewer-meta h6 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary-navy);
    }
    .reviewer-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }
    .reviewer-badge {
      font-size: 11px;
      background: #f1f5f9;
      color: #475569;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* 12. 资讯列表摘要 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--accent-cyan);
    }
    .news-img-box {
      width: 100%;
      height: 190px;
      position: relative;
      overflow: hidden;
    }
    .news-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-img-box img {
      transform: scale(1.04);
    }
    .news-badge {
      position: absolute;
      bottom: 12px;
      left: 14px;
      background: rgba(15, 43, 72, 0.85);
      color: #ffffff;
      font-size: 11px;
      padding: 3px 8px;
      border-radius: 4px;
      backdrop-filter: blur(4px);
    }
    .news-content {
      padding: 22px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: #94A3B8;
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-navy);
      line-height: 1.45;
      margin-bottom: 10px;
    }
    .news-excerpt {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link-btn {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-navy);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .news-link-btn:hover {
      color: var(--accent-cyan);
    }

    /* 13. FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-color: var(--accent-cyan);
    }
    .faq-summary {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary-navy);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      user-select: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--accent-cyan);
      transition: transform 0.25s ease;
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
    }
    .faq-body {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    /* 14. 转化收口区 */
    .cta-card {
      background: linear-gradient(135deg, #081626 0%, #0F2B48 100%);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      text-align: center;
      color: #ffffff;
      border: 1px solid rgba(0, 210, 180, 0.3);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
      position: relative;
      overflow: hidden;
    }
    .cta-h2 {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-desc {
      font-size: 16px;
      color: #CBD5E1;
      max-width: 680px;
      margin: 0 auto 34px auto;
      line-height: 1.7;
    }
    .cta-form-row {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 620px;
      margin: 0 auto;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 13px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.08);
      color: #ffffff;
      font-size: 14px;
      flex: 1 1 200px;
      outline: none;
      transition: var(--transition);
    }
    .cta-input:focus {
      border-color: var(--accent-cyan);
      background: rgba(255, 255, 255, 0.15);
    }
    .cta-input::placeholder {
      color: #94A3B8;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--navy-dark);
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      font-size: 13px;
    }
    .footer-links a:hover {
      color: var(--accent-cyan);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 26px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-grid, .z-row, .z-row.reverse, .dark-sci-inner, .story-card-wrapper {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .grid-3x2, .plans-grid, .reviews-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-img-box img {
        height: 300px;
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-toggle-btn {
        display: block;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 24px;
      }
      .grid-3x2, .plans-grid, .reviews-grid, .news-grid, .scenario-grid, .hotspots-row {
        grid-template-columns: 1fr;
      }
      .hero-highlights {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .story-content {
        padding: 24px;
      }
      .cta-card {
        padding: 40px 20px;
      }
      .cta-form-row {
        flex-direction: column;
      }
    }