html, body { margin: 0; height: 100%; overflow: hidden; background: #000000; }
    body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; }
    #particles-js { position: fixed; inset: 0; z-index: -1; }
    #game-frame {
      position: fixed;
      inset: 0;
      width: 100%;
      height: 100%;
      border: none;
      z-index: 5;
      background: transparent;
    }