body {
  font-family: sans-serif;
  background: #fff;
  margin: 0;
  padding: 0;
  text-align: center;
  transform: scale(0.9);
  transform-origin: top center;
}

#title {
  font-size: 48px;
  color: blue;
  margin: 20px 0;
}

#container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

#left-panel {
  background-color: pink;
  width: 50%;
  padding: 20px;
  border-radius: 10px;
}

#right-panel {
  background-color: white;
  width: 50%;
  padding: 20px;
  text-align: left;
}

#right-panel h3 {
  font-size: 24px;
  margin-bottom: 15px;
  border-bottom: 2px solid #333;
}

#controls {
  margin-top: 20px;
}

button {
  margin: 0 10px;
  padding: 10px 20px;
  font-size: 18px;
  cursor: pointer;
}

/* 履歴表示エリアの調整 */
#history {
  margin-top: 10px;
  font-size: 20px;
}

/* 10個ずつの行 */
.history-row {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
  min-height: 45px;
  border-bottom: 1px solid #eee;
}

/* 行の左側に「1-10」などのガイドを表示（任意） */
.history-row::before {
  content: attr(data-range);
  font-size: 12px;
  color: #888;
  width: 50px;
}

/* 数字のデザイン */
.num-badge {
  display: inline-block;
  width: 35px;
  height: 35px;
  line-height: 35px;
  text-align: center;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
  border-radius: 50%;
  margin-right: 5px;
  font-weight: bold;
  animation: pop 0.3s ease-out;
}

@keyframes pop {
  0% { transform: scale(0.5); }
  100% { transform: scale(1); }
}