/* 全螢幕置中黑底，畫面由 Canvas 程式繪製，無外部資產。 */
* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  background: #07060e;
  overflow: hidden;
  font-family: "Noto Sans TC", system-ui, "Segoe UI", sans-serif;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
}

#stage {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 30%, #16122a 0%, #07060e 70%);
}

#game {
  display: block;
  background: #0a0814;
  border-radius: 8px;
  box-shadow: 0 0 60px rgba(120, 90, 255, 0.25), 0 0 0 1px rgba(255,255,255,0.05);
  image-rendering: auto;
  cursor: crosshair;
  touch-action: none;
}