/* roulang page: index */
:root {
      --primary: #0284C7;
      --secondary: #0D9488;
      --accent: #2563EB;
      --bg-light: #F8FAFC;
      --surface: #FFFFFF;
      --dark-accent: #0F172A;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-shadow:hover {
      box-shadow: 0 16px 32px -4px rgba(2, 132, 199, 0.12);
      transform: translateY(-4px);
    }
    .nav-blur {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
      padding-top: 1rem;
    }
    .accordion-item.active .chevron-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }
    .accordion-item.active {
      border-left: 4px solid var(--primary);
    }