/* roulang page: index */
:root {
      --bg-deep: #070B19;
      --bg-card: rgba(16, 26, 54, 0.65);
      --border-glow: rgba(0, 240, 255, 0.18);
      --primary-blue: #1E40AF;
      --cyan-glow: #00F0FF;
      --purple-accent: #8B5CF6;
      --text-main: #F3F4F6;
      --text-muted: #94A3B8;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "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-glow);
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.45);
      box-shadow: 0 12px 40px 0 rgba(0, 240, 255, 0.12);
      transform: translateY(-2px);
    }
    .glow-btn {
      background: linear-gradient(135deg, #0284c7 0%, #00f0ff 100%);
      color: #04101e;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
      transition: all 0.3s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 0 28px rgba(0, 240, 255, 0.65);
      transform: translateY(-2px);
      color: #000;
    }
    .glow-btn-alt {
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(0, 240, 255, 0.4);
      color: #00F0FF;
      transition: all 0.3s ease;
    }
    .glow-btn-alt:hover {
      background: rgba(0, 240, 255, 0.15);
      border-color: #00F0FF;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
    }
    .nav-blur {
      background: rgba(7, 11, 25, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.12);
    }
    .radial-bg {
      background-image: 
        radial-gradient(circle at 15% 20%, rgba(30, 64, 175, 0.25) 0%, transparent 40%),
        radial-gradient(circle at 85% 80%, rgba(139, 92, 246, 0.2) 0%, transparent 40%);
    }