/* roulang page: index */
:root {
      --bg-dark: #0B0E14;
      --bg-surface: #121721;
      --bg-card: #161E2E;
      --border-color: #1E2638;
      --accent-green: #00E599;
      --accent-cyan: #00C4DF;
      --text-main: #F0F4FC;
      --text-sub: #8C96A8;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    .custom-card {
      background: rgba(22, 30, 46, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
      border-radius: 14px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-card:hover {
      border-color: rgba(0, 229, 153, 0.4);
      transform: translateY(-3px);
      box-shadow: 0 12px 30px -10px rgba(0, 229, 153, 0.15);
    }
    .hero-mesh {
      background-image: radial-gradient(circle at 50% 20%, rgba(0, 229, 153, 0.08) 0%, transparent 60%),
                        radial-gradient(circle at 80% 40%, rgba(0, 196, 223, 0.06) 0%, transparent 50%);
    }
    .glow-btn {
      transition: all 0.25s ease;
      box-shadow: 0 4px 18px rgba(0, 229, 153, 0.25);
    }
    .glow-btn:hover {
      box-shadow: 0 6px 26px rgba(0, 229, 153, 0.45);
      transform: translateY(-1px);
    }
    .grid-lines {
      background-size: 32px 32px;
      background-image: linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    }