/* roulang page: index */
:root {
      --primary: #00D2B4;
      --primary-dark: #0A192F;
      --accent: #6C5CE7;
      --text-main: #0F172A;
      --text-muted: #475569;
      --bg-light: #F8FAFC;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.75;
    }
    section[id] {
      scroll-margin-top: 5.5rem;
    }
    .custom-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(0, 210, 180, 0.15);
      border-color: rgba(0, 210, 180, 0.4);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(10, 25, 47, 0.94) 0%, rgba(11, 19, 43, 0.96) 100%), url('/assets/images/da03f824c0889027.png') center/cover no-repeat;
    }
    .dark-matrix-bg {
      background: radial-gradient(circle at 50% 30%, rgba(108, 92, 231, 0.15) 0%, rgba(11, 19, 43, 1) 70%), url('/assets/images/2bb98d0b3a42a74e.png') center/cover no-repeat;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    .btn-gradient {
      background: linear-gradient(135deg, #00D2B4 0%, #00B89F 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      background: linear-gradient(135deg, #00ECC9 0%, #00D2B4 100%);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px -2px rgba(0, 210, 180, 0.35);
    }