/* roulang page: index */
:root {
      --primary: #5B4CF0;
      --primary-hover: #4A3DD9;
      --primary-soft: rgba(91,76,240,0.08);
      --primary-glow: rgba(91,76,240,0.12);
      --accent-green: #00C48C;
      --accent-orange: #FF8A3D;
      --accent-cyan: #00B8D4;
      --bg-light: #F7F8FC;
      --bg-white: #FFFFFF;
      --bg-dark: #1A1D2E;
      --text-dark: #1A1D2E;
      --text-mid: #2D3142;
      --text-body: #4A4F5C;
      --text-secondary: #8E94A4;
      --border-light: #EAECF2;
      --border-input: #D0D5DD;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 10px;
      --shadow-sm: 0px 2px 8px rgba(26,29,46,0.04);
      --shadow-md: 0px 8px 24px rgba(26,29,46,0.08);
      --transition: 200ms ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      z-index: 50;
      transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 18px rgba(91,76,240,0.28);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: background var(--transition), color var(--transition);
      display: inline-block;
      cursor: pointer;
      white-space: nowrap;
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        display: none;
        gap: 16px;
        z-index: 45;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #F7F8FC 0%, #EDEFF7 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
      position: relative;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .data-card-float {
      background: white;
      border-radius: var(--radius-lg);
      padding: 20px 24px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      gap: 16px;
      width: fit-content;
      animation: float 5s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      100% { transform: translateY(-12px); }
    }
    .metric-big {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-title {
        font-size: 32px;
      }
      .metric-big {
        font-size: 32px;
      }
    }
    /* 看板 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 16px;
    }
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: box-shadow var(--transition), transform var(--transition);
    }
    .stat-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-item {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-light);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .compare-row {
      display: flex;
      gap: 30px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
    }
    .vs-badge {
      font-weight: 700;
      color: var(--primary);
      font-size: 20px;
    }
    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      font-weight: 600;
      font-size: 16px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      font-size: 15px;
      color: var(--text-body);
    }
    /* CTA */
    .cta-block {
      background: var(--bg-dark);
      border-radius: 32px;
      padding: 80px 24px;
      text-align: center;
    }
    .cta-input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      width: 280px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }