html, body {
  margin: 0;
  height: 100%;
  background: #e8e6dd;           /* 종이 바깥 여백 */
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
body { display: flex; align-items: center; justify-content: center; }
#game {
  /* 가로 16:9 유지하며 화면에 꽉 차게(레터박스) */
  width: 100vw;
  max-width: 100vw;
  height: auto;
  max-height: 100vh;
  aspect-ratio: 800 / 450;
  display: block;
  background: #fdfdf9;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}