/* roulang page: index */
:root {
      --primary: #1B64DA;
      --primary-hover: #1451B5;
      --secondary: #0B2545;
      --accent: #00A3C4;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0A192F;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --border: #E2E8F0;
      --card-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.05), 0 0 1px 1px rgba(226, 232, 240, 0.8);
      --card-shadow-hover: 0 20px 35px -5px rgba(27, 100, 218, 0.12), 0 0 1px 1px rgba(27, 100, 218, 0.2);
      --radius: 12px;
      --transition: all 0.3s ease;
    }

    * {
      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;
      line-height: 1.65;
      color: var(--text-main);
      background-color: var(--bg-white);
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部信息条 */
    .top-bar {
      background-color: #F1F5F9;
      font-size: 13px;
      color: var(--text-sub);
      border-bottom: 1px solid var(--border);
      padding: 8px 0;
    }
    .top-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-meta span {
      margin-right: 20px;
    }

    /* 主导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo-badge {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 16px;
      font-weight: bold;
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      min-height: 44px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(27, 100, 218, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 20px rgba(27, 100, 218, 0.4);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background-color: transparent;
      border-color: var(--border);
      color: var(--text-main);
    }
    .btn-secondary:hover {
      background-color: #F8FAFC;
      border-color: #CBD5E1;
    }

    /* 汉堡按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--secondary);
    }

    /* Section 通用 */
    section {
      padding: 80px 0;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-header.center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background-color: rgba(27, 100, 218, 0.08);
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 板块 1: 首屏 Banner */
    .hero-section {
      background: linear-gradient(180deg, #F1F6FD 0%, #FFFFFF 100%);
      padding: 90px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--secondary);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 32px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-stats-inline {
      display: flex;
      gap: 30px;
      border-top: 1px solid var(--border);
      padding-top: 24px;
    }
    .hero-stat-item h4 {
      font-size: 24px;
      color: var(--primary);
      font-weight: 700;
    }
    .hero-stat-item p {
      font-size: 13px;
      color: var(--text-sub);
    }
    .hero-media-wrapper {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(11, 37, 69, 0.18);
      border: 1px solid var(--border);
    }

    /* 板块 2: 产品与指标 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .metric-badges {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .metric-badge-box {
      background-color: var(--bg-light);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 18px;
    }
    .metric-badge-box strong {
      display: block;
      font-size: 20px;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-badge-box span {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 板块 3: 核心优势 6网格 */
    .advantages-section {
      background-color: var(--bg-light);
    }
    .grid-3-col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--border);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-3px);
    }
    .adv-card-icon {
      width: 48px;
      height: 48px;
      background: rgba(27, 100, 218, 0.1);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 20px;
      margin-bottom: 18px;
      font-weight: bold;
    }
    .adv-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .adv-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 核心产品与子系统 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }
    .product-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .product-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.02);
      box-shadow: 0 15px 35px -5px rgba(27, 100, 218, 0.15);
    }
    .product-tag {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #fff;
      font-size: 12px;
      font-weight: bold;
      padding: 2px 10px;
      border-radius: 12px;
    }
    .product-card h3 {
      font-size: 21px;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .product-card p.prod-desc {
      font-size: 14px;
      color: var(--text-sub);
      margin-bottom: 24px;
      flex-grow: 0;
    }
    .prod-features {
      list-style: none;
      margin-bottom: 30px;
      flex-grow: 1;
    }
    .prod-features li {
      font-size: 14px;
      color: var(--text-muted);
      padding: 8px 0;
      border-bottom: 1px dashed var(--border);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .prod-features li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    /* 板块 5: 深色网格空域理念 */
    .dark-section {
      background-color: var(--bg-dark);
      color: #FFFFFF;
      padding: 90px 0;
    }
    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .dark-title {
      color: #FFFFFF;
      font-size: 32px;
      margin-bottom: 18px;
    }
    .dark-desc {
      color: #94A3B8;
      font-size: 16px;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .dark-cards-group {
      display: grid;
      gap: 20px;
    }
    .dark-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius);
      padding: 24px;
      transition: var(--transition);
    }
    .dark-card:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--accent);
    }
    .dark-card h4 {
      color: var(--accent);
      font-size: 18px;
      margin-bottom: 8px;
    }
    .dark-card p {
      color: #CBD5E1;
      font-size: 14px;
    }

    /* 板块 6: 落地用户故事 */
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .story-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .story-card-body {
      padding: 28px;
    }
    .story-card-body h3 {
      font-size: 20px;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .story-card-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }
    .story-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
      background: rgba(27, 100, 218, 0.08);
      padding: 4px 8px;
      border-radius: 4px;
    }

    /* 板块 7: 成果数据条 */
    .metrics-bar-section {
      background: linear-gradient(90deg, #F1F5F9 0%, #E2E8F0 100%);
      padding: 50px 0;
    }
    .metrics-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-num {
      font-size: 38px;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1;
      margin-bottom: 8px;
    }
    .metric-num span {
      font-size: 20px;
      color: var(--primary);
    }
    .metric-lbl {
      font-size: 14px;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 板块 8: 客户评价 */
    .testimonials-section {
      background-color: var(--bg-light);
    }
    .testi-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .testi-author strong {
      display: block;
      font-size: 15px;
      color: var(--secondary);
    }
    .testi-author span {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 板块 9: 新闻资讯与政策 */
    .news-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .news-featured {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .news-featured-content {
      padding: 24px;
    }
    .news-featured-content h3 {
      font-size: 18px;
      color: var(--secondary);
      margin-bottom: 10px;
    }
    .news-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .news-item {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      cursor: pointer;
    }
    .news-item:hover {
      border-color: var(--primary);
    }
    .news-item-date {
      font-size: 12px;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .news-item h4 {
      font-size: 16px;
      color: var(--secondary);
      margin-bottom: 6px;
    }
    .news-item p {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 板块 10: 适用人群与场景 */
    .scenes-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scene-card {
      background: var(--bg-light);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }
    .scene-card:hover {
      background: var(--bg-white);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--primary);
    }
    .scene-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 14px;
    }
    .scene-card h3 {
      font-size: 17px;
      color: var(--secondary);
      margin-bottom: 8px;
    }
    .scene-card p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 板块 11: FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .faq-header {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 16px;
      color: var(--secondary);
      background-color: var(--bg-white);
      transition: var(--transition);
    }
    .faq-header:hover {
      background-color: #F8FAFC;
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }
    .faq-body {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background-color: #F8FAFC;
      border-top: 1px solid transparent;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-body {
      padding: 18px 24px;
      max-height: 200px;
      border-top-color: var(--border);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 板块 12: CTA 表单转化 */
    .cta-section {
      background: linear-gradient(135deg, #1B64DA 0%, #0B2545 100%);
      color: #FFFFFF;
      border-radius: 20px;
      padding: 60px 40px;
      box-shadow: 0 20px 40px rgba(11, 37, 69, 0.2);
    }
    .cta-content {
      max-width: 760px;
      margin: 0 auto;
      text-align: center;
    }
    .cta-title {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .cta-desc {
      font-size: 16px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .cta-form {
      display: grid;
      grid-template-columns: repeat(3, 1fr) auto;
      gap: 12px;
      background: rgba(255, 255, 255, 0.1);
      padding: 12px;
      border-radius: 12px;
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .cta-input {
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: 6px;
      padding: 12px 14px;
      font-size: 14px;
      background: rgba(255, 255, 255, 0.95);
      color: var(--text-main);
      outline: none;
    }
    .cta-input:focus {
      border-color: var(--primary);
    }

    /* 页脚 */
    .footer {
      background-color: var(--secondary);
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-col h4 {
      font-size: 16px;
      color: #FFFFFF;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      font-size: 14px;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-contact p {
      font-size: 14px;
      margin-bottom: 8px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-grid, .intro-grid, .dark-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .products-grid, .grid-3-col, .scenes-grid {
        grid-template-columns: 1fr 1fr;
      }
      .metrics-bar-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cta-form {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 767px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.05);
        display: none;
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-cta-btn {
        display: none;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 24px;
      }
      .products-grid, .grid-3-col, .stories-grid, .scenes-grid {
        grid-template-columns: 1fr;
      }
      .metrics-bar-grid {
        grid-template-columns: 1fr;
      }
      .cta-form {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }