/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1442af;
      --primary-light: #EBF5FF;
      --accent: #0E9F6E;
      --accent-warm: #FF5A1F;
      --text-main: #111928;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --bg-main: #FFFFFF;
      --bg-subtle: #F9FAFB;
      --bg-dark: #111927;
      --border-color: #E5E7EB;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 28px -6px rgba(26,86,219,0.12);
      --transition: all 0.25s ease;
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      color: var(--text-body);
      background-color: var(--bg-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }

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

    /* 顶部通栏提示 */
    .top-bar {
      background-color: var(--bg-dark);
      color: #D1D5DB;
      font-size: 0.85rem;
      padding: 8px 0;
      border-bottom: 1px solid #1F2A37;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .top-badge {
      background-color: var(--primary);
      color: #fff;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 600;
      margin-right: 8px;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-nav {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-item a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 0.95rem;
    }
    .nav-item a:hover {
      color: var(--primary);
    }
    .nav-cta {
      background-color: var(--accent-warm);
      color: #fff !important;
      padding: 9px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
    }
    .nav-cta:hover {
      background-color: #E04812;
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.3);
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      gap: 8px;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(26, 86, 219, 0.3);
    }
    .btn-accent {
      background: var(--accent-warm);
      color: #fff;
    }
    .btn-accent:hover {
      background: #E04812;
      box-shadow: 0 6px 18px rgba(255, 90, 31, 0.3);
    }
    .btn-outline {
      border-color: var(--border-color);
      background: #fff;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-alt {
      background-color: var(--bg-subtle);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #F3F4F6;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      color: var(--primary);
      background-color: var(--primary-light);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .section-dark .section-tag {
      background-color: rgba(26, 86, 219, 0.25);
      color: #93C5FD;
    }
    .section-title {
      font-size: 2.1rem;
      color: var(--text-main);
      font-weight: 800;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      color: var(--text-body);
      font-size: 1.05rem;
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #9CA3AF;
    }

    /* 1. 首屏区 Hero */
    .hero-section {
      position: relative;
      padding: 80px 0 100px;
      background: linear-gradient(180deg, #F0F5FF 0%, #FFFFFF 100%);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-subtitle {
      font-size: 1.15rem;
      line-height: 1.8;
      color: var(--text-body);
      margin-bottom: 30px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .hero-badges span {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-badges svg {
      width: 16px;
      height: 16px;
      fill: var(--accent);
    }
    .hero-visual {
      position: relative;
    }
    .hero-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }
    .hero-card img {
      border-radius: var(--radius-md);
      margin-bottom: 18px;
    }
    .hero-stat-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      text-align: center;
    }
    .hero-stat-item {
      background: var(--bg-subtle);
      padding: 12px 8px;
      border-radius: var(--radius-sm);
    }
    .hero-stat-num {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
    }
    .hero-stat-lbl {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* 2. 系统介绍 */
    .split-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .split-img {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .check-list {
      list-style: none;
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .check-item {
      display: flex;
      gap: 12px;
      font-size: 0.98rem;
      color: var(--text-body);
    }
    .check-icon {
      width: 20px;
      height: 20px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
      font-size: 0.8rem;
    }

    /* 3. 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: #fff;
      padding: 30px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .metric-val {
      font-size: 2.3rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .metric-name {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .metric-sub {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 4. 优势矩阵 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #fff;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #BFDBFE;
    }
    .feature-icon-wrap {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .feature-icon-wrap svg {
      width: 24px;
      height: 24px;
      fill: var(--primary);
    }
    .feature-h3 {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-p {
      font-size: 0.92rem;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* 5. 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .solution-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .solution-tag-sm {
      font-size: 0.78rem;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 8px;
      text-transform: uppercase;
    }
    .solution-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .solution-text {
      font-size: 0.9rem;
      color: var(--text-body);
      margin-bottom: 20px;
      flex-grow: 1;
    }

    /* 6. 对比矩阵 */
    .contrast-table-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .contrast-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 36px;
    }
    .contrast-box.highlight {
      background: rgba(26, 86, 219, 0.15);
      border-color: rgba(26, 86, 219, 0.4);
    }
    .contrast-head {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 24px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .contrast-ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .contrast-li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: #D1D5DB;
    }
    .contrast-tag-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      margin-top: 7px;
      flex-shrink: 0;
    }
    .dot-red { background-color: #EF4444; }
    .dot-green { background-color: #10B981; }

    /* 7. 里程碑时间线 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .timeline-card {
      background: #fff;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-badge {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.3;
      margin-bottom: 8px;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .step-desc {
      font-size: 0.88rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 8. 客户故事 */
    .story-card {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      box-shadow: var(--shadow-sm);
    }
    .story-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-content {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-quote {
      font-size: 1.05rem;
      color: var(--text-main);
      line-height: 1.8;
      font-style: italic;
      margin-bottom: 24px;
    }
    .story-meta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .story-avatar-text {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }
    .story-author {
      font-weight: 700;
      color: var(--text-main);
    }
    .story-role {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 9. 宏观数据条 */
    .strip-stat {
      background: #0B1120;
      color: #fff;
      padding: 44px 0;
      border-top: 1px solid #1E293B;
      border-bottom: 1px solid #1E293B;
    }
    .strip-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .strip-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #60A5FA;
      margin-bottom: 4px;
    }
    .strip-lbl {
      font-size: 0.9rem;
      color: #94A3B8;
    }

    /* 10. 用户评价 */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #fff;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-stars {
      color: #F59E0B;
      font-size: 1.1rem;
      margin-bottom: 14px;
    }
    .testi-text {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .testi-footer {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .testi-name {
      font-weight: 700;
      font-size: 0.92rem;
      color: var(--text-main);
    }
    .testi-sub {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 11. 资讯洞察 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .insight-card {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .insight-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .insight-padding {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .insight-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .insight-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-desc {
      font-size: 0.88rem;
      color: var(--text-body);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .insight-link {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* 12. FAQ */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-summary {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      position: relative;
      user-select: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-summary::after {
      content: "+";
      position: absolute;
      right: 24px;
      top: 50%;
      transform: translateY(-50%);
      font-size: 1.3rem;
      color: var(--primary);
      font-weight: 400;
    }
    .faq-item[open] .faq-summary::after {
      content: "-";
    }
    .faq-content {
      padding: 0 24px 22px;
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 13. 转化表单 */
    .form-wrapper {
      background: #fff;
      max-width: 820px;
      margin: 0 auto;
      border-radius: var(--radius-lg);
      padding: 44px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      text-align: left;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background: var(--bg-subtle);
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
    }
    .form-foot-note {
      font-size: 0.8rem;
      color: var(--text-muted);
      text-align: center;
      margin-top: 14px;
    }

    /* 页脚 Footer */
    .site-footer {
      background: var(--bg-dark);
      color: #9CA3AF;
      padding: 70px 0 30px;
      border-top: 1px solid #1F2A37;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: #fff;
      font-size: 1.3rem;
      margin-bottom: 14px;
      font-weight: 800;
    }
    .footer-brand p {
      line-height: 1.7;
      font-size: 0.88rem;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      color: #fff;
      font-size: 1rem;
      margin-bottom: 18px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid #1F2A37;
      padding-top: 26px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
    }

    /* 移动端菜单控制 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle svg {
      width: 26px;
      height: 26px;
      fill: var(--text-main);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .grid-3x2, .solution-grid, .testi-grid, .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid, .timeline-grid, .strip-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.active {
        display: flex;
      }
      .hero-grid, .split-box, .story-card, .contrast-table-wrap {
        grid-template-columns: 1fr;
      }
      .grid-3x2, .solution-grid, .testi-grid, .insights-grid, .metrics-grid, .timeline-grid, .strip-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .form-wrapper {
        padding: 24px;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }