/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-dark: #0F172A;
      --accent-cyan: #06B6D4;
      --accent-gold: #F59E0B;
      --bg-slate: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --card-radius: 1.25rem;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: #334155;
      background-color: #ffffff;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    .hero-bg {
      background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 64, 175, 0.85) 100%), url('/assets/images/dcf040487b3af60a.webp');
      background-size: cover;
      background-position: center;
    }
    .tech-bg {
      background-image: linear-gradient(180deg, rgba(15, 23, 42, 0.97) 0%, rgba(15, 23, 42, 0.95) 100%), url('/assets/images/e12dcfd3a86bd9d7.webp');
      background-size: cover;
      background-position: center;
    }
    .card-hover-effect {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(6, 182, 212, 0.1), 0 8px 10px -6px rgba(30, 64, 175, 0.1);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }