/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-light: #6E8EF7;
      --primary-soft: rgba(78, 110, 242, 0.08);
      --primary-glow: rgba(78, 110, 242, 0.4);
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg: #F5F6FA;
      --surface: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-disabled: #C9CDD4;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 24px;
      --space-section: 80px;
      --space-element: 24px;
      --font-hero: 48px;
      --font-heading: 32px;
      --font-card-title: 20px;
      --font-body: 16px;
      --font-small: 14px;
      --transition: 300ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-family);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: var(--font-body);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--space-element);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: all var(--transition);
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .header.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: var(--font-body);
      color: var(--text-secondary);
      font-weight: 500;
      padding: 8px 0;
      position: relative;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
      border-radius: 2px;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 12px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 16px var(--primary-glow);
    }
    .nav-cta:hover {
      background: var(--primary-light);
      box-shadow: 0 4px 20px var(--primary-glow);
    }
    .mobile-toggle {
      display: none;
      background: none;
      font-size: 24px;
      color: var(--text-primary);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1F36 0%, #0D1124 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 70px;
    }
    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(78,110,242,0.15) 0%, transparent 40%),
                  radial-gradient(circle at 80% 70%, rgba(0,181,120,0.1) 0%, transparent 40%);
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      font-size: var(--font-hero);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content p {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 20px var(--primary-glow);
    }
    .btn-primary:hover {
      background: var(--primary-light);
      transform: scale(1.02);
    }
    .btn-outline {
      background: rgba(78,110,242,0.1);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      background: rgba(78,110,242,0.2);
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .glass-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 20px;
      padding: 24px;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      width: 100%;
      max-width: 400px;
    }
    .glass-card img {
      border-radius: 12px;
      width: 100%;
      height: auto;
    }
    /* 通用板块 */
    section {
      padding: var(--space-section) 0;
    }
    .section-title {
      font-size: var(--font-heading);
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 18px;
    }
    /* 价值卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -40px;
      position: relative;
      z-index: 3;
    }
    .stat-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-elevated);
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: var(--font-small);
    }
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: left;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-elevated);
    }
    .solution-icon {
      width: 56px;
      height: 56px;
      background: var(--primary-soft);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 28px;
      margin-bottom: 24px;
    }
    .solution-card h3 {
      font-size: var(--font-card-title);
      margin-bottom: 12px;
    }
    .solution-card p {
      color: var(--text-secondary);
    }
    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
    }
    .scenario-text p {
      color: var(--text-secondary);
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    /* 案例轮播 */
    .cases-carousel {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .case-content {
      flex: 1;
    }
    .case-chart {
      flex: 1;
      background: #f0f2ff;
      height: 200px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 600;
    }
    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .pricing-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.02);
      box-shadow: var(--shadow-elevated);
    }
    .pricing-card h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }
    .price {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      width: 100%;
      text-align: left;
      font-size: 18px;
      color: var(--text-primary);
    }
    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }
    /* 页脚 */
    .footer {
      background: #1F2329;
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      margin-bottom: 20px;
      font-size: 18px;
    }
    .footer-col a {
      display: block;
      color: #C9CDD4;
      margin-bottom: 12px;
      font-size: 14px;
    }
    .footer-col a:hover {
      color: white;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      color: #86909C;
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content p {
        max-width: 100%;
      }
      .hero-buttons {
        justify-content: center;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .solutions-grid {
        grid-template-columns: 1fr 1fr;
      }
      .pricing-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
      .cases-carousel {
        flex-direction: column;
      }
      .solutions-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }