body {
  margin: 0;
  background: black;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  user-select: none; /* テキスト選択防止 */
  touch-action: none; /* スクロールや拡大防止 */

}


#gameContainer {
  position: relative;
  width: 100vw;
  max-width: 1000px;
  aspect-ratio: 3 / 2;
  display: flex;
  justify-content: center;
  align-items: center;
}

#gameCanvas {
  background: #000000;
  width: 60%;
  height: 50%;
  display: block;
}

.controlPanel {
  position: relative;
  width: 20%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
}

.button {
  background: #333;
  color: white;
  font-size: 18px;
  height: 80px;
  padding: 30px;
  text-align: center;
  border-radius: 10px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.button:active {
  background: #555;
}