* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  background: #4fb8e8;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

#gl, #hud {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

#hud { pointer-events: none; }

#rotate { display: none; }

@media (orientation: portrait) and (max-height: 520px) {
  #gl, #hud { display: none; }
  #rotate {
    display: flex;
    position: fixed;
    inset: 0;
    align-items: center;
    justify-content: center;
    padding: 24px;
    color: #fff;
    font: 600 20px system-ui, sans-serif;
    text-align: center;
    background: #111;
  }
}