html, body {
  margin: 0;
  padding: 0;
  background: #1a1410;
  color: #e8dcc8;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}
#wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 10px;
}
#game {
  border: 4px solid #5a4632;
  border-radius: 4px;
  background: #000;
  max-width: 96vw;
  height: auto;
}
#help {
  font-size: 13px;
  color: #a89878;
}

/* スマホ非対応。狭い画面では案内だけ出す（ゲーム本体はキーボード前提） */
#pc-only {
  display: none;
  margin: 0;
  padding: 14px 18px;
  max-width: 90vw;
  border: 1px solid #6a5540;
  border-radius: 8px;
  background: #241a14;
  color: #e8dcc8;
  font-size: 14px;
  line-height: 1.7;
  text-align: center;
}
@media (max-width: 820px), (pointer: coarse) {
  #pc-only { display: block; }
}