/* --- Backボタン --- */
.button-back {
  position: fixed;
  top: 5%;
  left: 5%;
  width: 60px; /* 適宜調整 */
  height: auto;
  z-index: 101;
  cursor: pointer;
}
.button-back img {
  width: 100%;
  height: auto;
  pointer-events: none;
}

/* --- 設定ボタン --- */
.settings-button {
  position: fixed;
  top: 5%;
  right: 5%;
  width: 60px;  /* Backボタンと同じ */
  height: auto; /* 高さ自動調整 */
  z-index: 101; /* Backボタンと同じレイヤー */
  cursor: pointer;
}
.settings-button img {
  width: 100%;
  height: auto;
  pointer-events: none;
  transition: transform 0.2s ease;
}
.settings-button:hover img {
  transform: scale(1.1);
}

/* --- モーダル全体 --- */
#settingsModal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

/* --- モーダル内容 --- */
#settingsModal .modal-content {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  padding: 30px 50px;
  color: #fff;
  font-family: sans-serif;
  text-align: center;
  box-shadow: 0 0 20px rgba(255,255,255,0.15);
  min-width: 300px;
  animation: fadeIn 0.3s ease-out;
}

/* --- モーダルボタン --- */
#settingsModal button {
  margin: 10px;
  padding: 10px 25px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
}

/* --- ONボタン --- */
#settingsModal .on {
  background: linear-gradient(135deg,#00d4ff,#0088ff);
  color: #fff;
  box-shadow: 0 4px 10px rgba(0,136,255,0.5);
}
#settingsModal .on:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,136,255,0.6);
}

/* --- OFFボタン --- */
#settingsModal .off {
  background: rgba(255,255,255,0.1);
  color: #ddd;
  border: 1px solid rgba(255,255,255,0.3);
}
#settingsModal .off:hover {
  background: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

/* --- アニメーション --- */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

/* --- モーダル内のテキスト入力 --- */
#settingsModal input[type="text"] {
  width: 80%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.05);
  color: #fff;
  margin: 5px 0;
  font-size: 1rem;
  outline: none;
  transition: all 0.2s ease;
}
#settingsModal input[type="text"]:focus {
  background: rgba(255,255,255,0.15);
  border-color: #00d4ff;
}
@media screen and (max-width: 768px) {

  /* Backボタン */
  .button-back {
    width: 60px;
  }

  /* 設定ボタン */
  .settings-button {
    width: 60px;
  }

  /* モーダル全体 */
  #settingsModal {
    align-items: center;
    justify-content: center;
  }

  /* モーダル内容 */
  #settingsModal .modal-content {
    padding: 20px 30px;
    min-width: 240px;
    font-size: 0.9rem;
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(255,255,255,0.15);
  }

  /* モーダルボタン */
  #settingsModal button {
    margin: 8px;
    padding: 8px 20px;
    font-size: 0.9rem;
    border-radius: 8px;
  }

  /* ONボタン */
  #settingsModal .on {
    box-shadow: 0 3px 8px rgba(0,136,255,0.5);
  }
  #settingsModal .on:hover {
    box-shadow: 0 5px 12px rgba(0,136,255,0.6);
  }

  /* OFFボタン */
  #settingsModal .off:hover {
    transform: translateY(-1px);
  }

  /* テキスト入力 */
  #settingsModal input[type="text"] {
    width: 90%;
    padding: 6px 10px;
    font-size: 0.9rem;
    border-radius: 6px;
  }
}