* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  height: 100%;
  overflow: hidden;
  background: #05060c;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
#game { display: block; width: 100vw; height: 100vh; }
.mute {
  position: fixed;
  top: 14px;
  right: 14px;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: #cdd3e6;
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 10;
}
.mute:hover { background: rgba(255, 255, 255, 0.12); }