.audio-player {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 10px 15px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }
  
  .play-btn, .mute-btn {
    background: #F0F0F0;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
  }
  
  .play-btn svg, .mute-btn svg {
    width: 18px;
    height: 18px;
    fill: #333;
  }
  
  .progress-container {
    flex: 1;
    height: 5px;
    background-color: #e0e0e0;
    margin: 0 15px;
    border-radius: 10px;
    cursor: pointer;
    position: relative;
  }
  
  .progress-bar {
    height: 100%;
    background-color: #333;
    border-radius: 10px;
    width: 30%; /* この値はJavaScriptで動的に変更されます */
  }
  
  .time-display {
    font-size: 12px;
    font-weight: 500;
    color: #333;
    min-width: 85px;
    text-align: center;
    font-family: monospace;
    letter-spacing: 0.5px;
    margin-right: 10px;
    font-family: 'Noto Sans JP', sans-serif;
  }
  
  /* メニューボタンのスタイル */
  .menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-left: 5px;
    position: relative;
  }
  
  .menu-btn svg {
    width: 18px;
    height: 18px;
    fill: #333;
  }
  
  /* メニューのスタイル */
  .menu-container {
    position: absolute;
    right: 0;
    width: 180px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 100;
    display: none;
    padding: 8px 0;
    min-height: 250px;
  }
  
  .menu-container.active {
    display: block;
  }
  
  .menu-item {
    padding: 8px 15px;
    display: flex;
    align-items: center;
    cursor: pointer;
  }
  
  .menu-item:hover {
    background-color: #f5f5f5;
  }
  
  .menu-item svg {
    width: 16px;
    height: 16px;
    margin-right: 10px;
    fill: #555;
  }
  
  .menu-item span {
    font-size: 14px;
    color: #333;
  }
  
  /* 再生速度メニュー */
  .speed-options {
    display: flex;
    flex-direction: column;
    padding: 0 15px;
  }
  
  .speed-option {
    display: flex;
    align-items: center;
    margin: 5px 0;
  }
  
  .speed-option input {
    margin-right: 8px;
  }
  
  .speed-option label {
    font-size: 13px;
    color: #333;
  }
  
  /* セパレーター */
  .separator {
    height: 1px;
    background-color: #eee;
    margin: 5px 0;
  }