/* roulang page: index */
:root {
      --primary-color: #1E293B;
      --accent-color: #0EA5E9;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      font-family: Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(11, 15, 23, 0.95), rgba(15, 23, 42, 0.82)), url('/assets/images/0d5d0ee59d29c2da.webp');
      background-size: cover;
      background-position: center;
    }
    .tech-bg {
      background-image: linear-gradient(to bottom, rgba(11, 15, 23, 0.96), rgba(15, 23, 42, 0.94)), url('/assets/images/8a630251df5dff39.webp');
      background-size: cover;
      background-position: center;
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.08);
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }