/* roulang page: index */
:root {
      --bg-midnight: #070B19;
      --bg-midnight-card: rgba(19, 29, 66, 0.65);
      --border-glow: rgba(59, 130, 246, 0.25);
      --accent-cyan: #06B6D4;
      --accent-blue: #2563EB;
      --accent-gold: #F59E0B;
    }
    body {
      background-color: var(--bg-midnight);
      color: #E2E8F0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--bg-midnight-card);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-glow);
      box-shadow: inset 0 1px 1px 0 rgba(255, 255, 255, 0.1);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(6, 182, 212, 0.5);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px -5px rgba(6, 182, 212, 0.15), inset 0 1px 2px 0 rgba(255, 255, 255, 0.15);
    }
    .btn-gradient-glow {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
      transition: all 0.3s ease;
    }
    .btn-gradient-glow:hover {
      box-shadow: 0 0 28px rgba(6, 182, 212, 0.65);
      transform: translateY(-2px);
    }
    .btn-outline-glass {
      border: 1px solid rgba(59, 130, 246, 0.4);
      background: rgba(13, 21, 47, 0.6);
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .btn-outline-glass:hover {
      background: rgba(37, 99, 235, 0.2);
      border-color: var(--accent-cyan);
      color: #fff;
    }
    .roadmap-badge {
      background: rgba(37, 99, 235, 0.15);
      border: 1px solid rgba(6, 182, 212, 0.3);
    }
    input::placeholder {
      color: #64748B;
    }