body {
  text-align: center;
  font-family: 'Arial', sans-serif;
  background-color: #fef6ff;
}

#clickImage {
  width: 300px;
  cursor: pointer;
  transition: transform 0.1s;
}
#clickImage:active {
  transform: scale(0.95);
}

#storePopup, #youtubePopup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  border: 2px solid #999;
  padding: 25px 30px;
  width: 480px;           /* 幅広げました */
  max-width: 90vw;        /* 画面幅に合わせて最大90% */
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
  z-index: 1000;
  border-radius: 12px;
}

#youtubeFrame {
  width: 440px;           /* 動画幅を大きく */
  height: 248px;          /* 16:9比率に近く */
  max-width: 100%;        /* 画面幅に合わせて縮小 */
  border-radius: 8px;
}

.hidden {
  display: none;
}

.upgradeItem {
  margin-bottom: 15px;
}

.effect {
  position: absolute;
  color: #8000ff;
  font-size: 20px;
  font-weight: bold;
  animation: popUp 0.8s ease-out forwards;
  pointer-events: none;
}

@keyframes popUp {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(-40px); opacity: 0; }
}

/* ボタンデザイン */
button {
  background: #f5ccff;
  border: none;
  padding: 8px 15px;
  border-radius: 8px;
  margin: 5px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #e4b3fa;
}

/* YouTube入力欄 */
input[type="text"] {
  width: 90%;
  padding: 5px;
  margin-bottom: 10px;
}