/* roulang page: index */
:root {
      --bg-main: #0F172A;
      --bg-card: #1E293B;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border-color: #334155;
      --accent-cyan: #06B6D4;
      --accent-indigo: #6366F1;
    }
    html {
      scroll-behavior: smooth;
      font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #0B0F19;
      color: #E2E8F0;
      overflow-x: hidden;
    }
    .text-gradient {
      background: linear-gradient(135deg, #38BDF8 0%, #818CF8 50%, #C084FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .btn-gradient {
      background: linear-gradient(135deg, #06B6D4 0%, #6366F1 100%);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-gradient:hover {
      box-shadow: 0 0 25px rgba(6, 182, 212, 0.45);
      transform: translateY(-2px);
    }
    .glass-card {
      background: rgba(30, 41, 59, 0.7);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(6, 182, 212, 0.3);
      transform: translateY(-4px);
    }