/* roulang page: index */
:root {
      --bg-dark: #0a0f1d;
      --bg-card: rgba(15, 23, 42, 0.72);
      --border-blue: rgba(59, 130, 246, 0.22);
      --primary-blue: #2563eb;
      --accent-cyan: #06b6d4;
      --glow-blue: rgba(59, 130, 246, 0.4);
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      line-height: 1.7;
      overflow-x: hidden;
    }

    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--border-blue);
      box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(59, 130, 246, 0.45);
      transform: translateY(-3px);
      box-shadow: 0 16px 36px -10px rgba(37, 99, 235, 0.25);
    }

    .glow-btn-primary {
      background: linear-gradient(135deg, #2563eb, #3b82f6);
      box-shadow: 0 0 20px var(--glow-blue);
      transition: all 0.25s ease;
    }

    .glow-btn-primary:hover {
      box-shadow: 0 0 28px rgba(59, 130, 246, 0.65);
      transform: translateY(-2px);
    }

    .glow-btn-secondary {
      background: rgba(30, 41, 59, 0.7);
      border: 1px solid rgba(59, 130, 246, 0.35);
      transition: all 0.25s ease;
    }

    .glow-btn-secondary:hover {
      background: rgba(30, 41, 59, 0.95);
      border-color: #3b82f6;
    }

    .gradient-text {
      background: linear-gradient(135deg, #ffffff 30%, #93c5fd 75%, #38bdf8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .section-divider {
      position: relative;
    }
    .section-divider::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 10%;
      right: 10%;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
    }

    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }