/* roulang page: index */
:root {
      --bg-dark: #0B0F19;
      --bg-card: rgba(17, 24, 39, 0.72);
      --border-color: rgba(255, 255, 255, 0.08);
      --accent-blue: #2563EB;
      --accent-cyan: #38BDF8;
      --text-main: #FFFFFF;
      --text-sub: #E2E8F0;
      --text-muted: #94A3B8;
    }
    
    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-sub);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }

    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-color);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .glass-card:hover {
      border-color: rgba(56, 189, 248, 0.4);
      box-shadow: 0 15px 35px -10px rgba(37, 99, 235, 0.2);
    }

    .glow-btn {
      background: linear-gradient(135deg, #2563EB 0%, #38BDF8 100%);
      box-shadow: 0 0 25px rgba(37, 99, 235, 0.45);
      transition: all 0.3s ease;
    }

    .glow-btn:hover {
      box-shadow: 0 0 35px rgba(56, 189, 248, 0.75);
      transform: translateY(-2px);
    }

    .custom-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .custom-scroll::-webkit-scrollbar-track {
      background: rgba(11, 15, 25, 0.6);
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: rgba(56, 189, 248, 0.3);
      border-radius: 9999px;
    }

    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }