/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #1E40AF;
      --accent: #06B6D4;
      --accent-warm: #F97316;
      --bg-main: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B132B;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.1);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 32px;
      padding-right: 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    /* 顶部导航条 */
    .header-top {
      background-color: #0d1e3d;
      color: #94a3b8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .header-top-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .header-top-info {
      display: flex;
      gap: 24px;
    }
    .header-main {
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .brand-logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 900;
    }
    .brand-logo-text small {
      display: block;
      font-size: 10px;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--text-sub);
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1.5px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(15, 82, 186, 0.35);
    }
    .btn-ghost {
      border-color: var(--primary);
      color: var(--primary);
      background-color: transparent;
    }
    .btn-ghost:hover {
      background-color: rgba(15, 82, 186, 0.05);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Section 通用 */
    section {
      padding: 96px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-white);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 60px;
    }
    .section-badge {
      display: inline-block;
      padding: 6px 14px;
      background-color: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 1: Hero 首屏 */
    .hero-section {
      background: linear-gradient(180deg, #F1F5F9 0%, #FFFFFF 100%);
      padding: 70px 0 90px;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content p {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-metrics {
      display: flex;
      gap: 32px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }
    .hero-metric-item h4 {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
    }
    .hero-metric-item p {
      font-size: 13px;
      color: var(--text-sub);
      margin: 0;
    }
    .hero-visual-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.15);
      border: 1px solid rgba(226, 232, 240, 0.8);
      position: relative;
    }
    .hero-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      position: relative;
    }
    .hero-img-overlay {
      position: absolute;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(11, 19, 43, 0.85);
      backdrop-filter: blur(8px);
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      color: #FFFFFF;
      font-size: 13px;
    }

    /* 板块 2: 产品与技术简介 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .intro-specs-list {
      list-style: none;
      margin-top: 28px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .intro-specs-item {
      display: flex;
      gap: 16px;
      background: var(--bg-main);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary);
    }
    .intro-specs-item h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 4px;
      color: var(--text-main);
    }
    .intro-specs-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 3: 核心技术优势六宫格 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(15, 82, 186, 0.3);
    }
    .feature-icon-badge {
      width: 48px;
      height: 48px;
      background: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 4: 系统产品矩阵 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-box {
      background: var(--bg-main);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-box:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      background: #FFFFFF;
    }
    .product-img-box {
      height: 200px;
      overflow: hidden;
    }
    .product-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-box:hover .product-img-box img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-warm);
      text-transform: uppercase;
      margin-bottom: 8px;
    }
    .product-body h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .product-specs {
      list-style: none;
      margin-bottom: 24px;
      font-size: 13px;
      color: var(--text-sub);
      display: flex;
      flex-direction: column;
      gap: 8px;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .product-btn {
      margin-top: auto;
    }

    /* 板块 5: 流程工作流 */
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .workflow-step {
      background: var(--bg-white);
      padding: 30px 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .workflow-num {
      width: 40px;
      height: 40px;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      box-shadow: 0 4px 10px rgba(15, 82, 186, 0.3);
    }
    .workflow-step h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .workflow-step p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 6: 深色实战案例 */
    .dark-section {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .dark-section .section-badge {
      background: rgba(6, 182, 212, 0.15);
      color: var(--accent);
    }
    .case-gallery-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .case-metric-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 36px;
    }
    .case-stat-row {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 28px;
    }
    .stat-pill {
      background: rgba(255, 255, 255, 0.04);
      padding: 16px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--accent);
    }
    .stat-pill strong {
      display: block;
      font-size: 26px;
      color: var(--accent);
      font-weight: 800;
    }
    .stat-pill span {
      font-size: 13px;
      color: #CBD5E1;
    }

    /* 板块 7: 深度教练故事 */
    .story-card-alt {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 48px;
      background: var(--bg-white);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }
    .story-card-alt.reverse {
      grid-template-columns: 1fr 1fr;
      direction: rtl;
    }
    .story-card-alt.reverse .story-text {
      direction: ltr;
    }
    .story-text h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .story-text p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    /* 板块 8: 量化关键指标条 */
    .stats-banner {
      background: linear-gradient(90deg, #0F52BA 0%, #1E40AF 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .stats-flex {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stats-flex-item h2 {
      font-size: 42px;
      font-weight: 900;
      margin-bottom: 8px;
      letter-spacing: -0.5px;
    }
    .stats-flex-item p {
      font-size: 15px;
      color: #E2E8F0;
    }

    /* 板块 9: 专家评价墙 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .author-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .author-info h4 {
      font-size: 16px;
      font-weight: 700;
    }
    .author-info span {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 板块 10: 前沿研究动态 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .news-card-img {
      height: 180px;
      overflow: hidden;
    }
    .news-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-card-body {
      padding: 24px;
    }
    .news-meta {
      font-size: 12px;
      color: var(--text-sub);
      margin-bottom: 10px;
    }
    .news-card-body h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .news-card-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 11: 认证合规保障条 */
    .trust-badge-row {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 20px;
      align-items: center;
    }
    .trust-badge-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 12px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-sub);
      box-shadow: var(--shadow-sm);
    }

    /* 板块 12: FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-header {
      padding: 22px 28px;
      font-size: 17px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-header:hover {
      background-color: #F8FAFC;
    }
    .faq-chevron {
      transition: transform 0.3s ease;
      font-size: 14px;
    }
    .faq-item.active .faq-chevron {
      transform: rotate(180deg);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 28px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
    }
    .faq-item.active .faq-body {
      padding: 0 28px 24px;
      max-height: 300px;
    }

    /* 板块 13: 预约演示转化表单 */
    .booking-wrapper {
      background: linear-gradient(135deg, #FFFFFF 0%, #EFF6FF 100%);
      border: 1px solid rgba(15, 82, 186, 0.2);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      box-shadow: 0 20px 40px -15px rgba(15, 82, 186, 0.12);
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .booking-info h3 {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .booking-info p {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .booking-perks {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .booking-perks li {
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .booking-perks li::before {
      content: "✔";
      color: var(--primary);
      font-weight: bold;
    }
    .booking-form {
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background-color: #F8FAFC;
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }
    .form-checkbox-group {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
      margin-top: 8px;
    }
    .form-checkbox-label {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-muted);
      cursor: pointer;
    }

    /* 页脚 */
    footer {
      background-color: #0B132B;
      color: #94A3B8;
      padding: 72px 0 32px;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-brand h4 {
      font-size: 20px;
      color: #FFFFFF;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .footer-brand p {
      line-height: 1.8;
      margin-bottom: 20px;
      font-size: 14px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .intro-grid, .case-gallery-grid, .booking-wrapper, .story-card-alt, .story-card-alt.reverse {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .grid-3x2, .products-grid, .news-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-flex {
        grid-template-columns: repeat(2, 1fr);
      }
      .trust-badge-row {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .header-top {
        display: none;
      }
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        padding: 24px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .grid-3x2, .products-grid, .news-grid, .testimonial-grid, .workflow-timeline, .stats-flex, .trust-badge-row, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
      }
      .hero-metrics {
        flex-direction: column;
        gap: 16px;
      }
      .booking-wrapper {
        padding: 32px 20px;
      }
      .booking-form {
        padding: 24px 16px;
      }
    }