body {
  margin: 0;
  background: yellow;
}

canvas {
  border: 5px solid blue;
}
/* =====================
   レイアウト
===================== */

body {
  margin: 0;
  display: flex;
  justify-content: center; /* 全体中央寄せ */
  align-items: flex-start;
  background: #111;
}

#game {
  border: 4px solid #00aaff;
  background: #000;
}

#rankingBox {
  width: 260px;
  padding: 20px;
  margin-left: 20px;
  background: #222;
  color: white;
  font-family: monospace;
}

#rankingBox h2 {
  margin-top: 0;
  border-bottom: 1px solid #555;
  padding-bottom: 5px;
}

#rankingList div {
  margin: 6px 0;
}
/* =====================
   📱 スマホ用
===================== */
@media (max-width: 700px) {

  #rankingBox {
    display: none;
  }

  body {
    justify-content: center;
  }

  #game {
    width: 100vw;
    height: 100vh;
  }

}
/* =====================
   📱 スマホ用（安定版）
===================== */
@media (max-width: 700px) {

  #rankingBox {
    display: none;
  }

  body {
    justify-content: center;
    align-items: flex-start;
    padding-top: 20px; /* ←好きなだけ調整OK */
    height: 100vh;
  }

  #game {
    width: 95vw;
    height: auto;
  }

}
/* =====================
   📱 スクロール禁止
===================== */
body {
  overflow: hidden;
  touch-action: none;
}
/* =====================
   📱 コピー・選択禁止
===================== */
body, canvas {

  -webkit-user-select: none; /* iPhone */
  user-select: none;

  -webkit-touch-callout: none; /* 長押しメニューOFF */
  -webkit-tap-highlight-color: transparent; /* タップの青い枠消す */

}