body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #121212;
    color: #fff;
    display: flex;
    height: 100vh;
  }
  
  .app {
    display: flex;
    width: 100%;
  }
  
  .sidebar {
    width: 300px;
    background-color: #1e1e1e;
    padding: 20px;
    overflow-y: auto;
  }
  
  .sidebar h1 {
    font-size: 24px;
  }
  
  .sidebar input {
    width: 100%;
    padding: 10px;
    margin-top: 15px;
    border: none;
    border-radius: 5px;
  }
  
  .sidebar ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
  }
  
  .sidebar li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    cursor: pointer;
    border-bottom: 1px solid #333;
  }
  
  .sidebar li:hover {
    background-color: #333;
  }
  
  .sidebar img {
    width: 50px;
    height: 50px;
    border-radius: 5px;
    object-fit: cover;
  }
  
  .player-area {
    flex: 1;
    padding: 40px;
    box-sizing: border-box;
    overflow-y: auto;
  }
  
  #player-display {
    display: flex;
    align-items: center;
    gap: 20px;
  }
  
  #cover-img {
    width: 120px;
    height: 120px;
    border-radius: 10px;
    object-fit: cover;
  }
  
  #current-title {
    font-size: 24px;
  }
  
  .gap {
    margin-top: 20px;
  }
  
  #playlist {
    margin-top: 40px;
  }
  
  .chapter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background-color: #1f1f1f;
    border-radius: 5px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
  }
  
  .chapter:hover {
    background-color: #333;
  }
  
  .chapter.active {
    background-color: #3b3b3b;
    font-weight: bold;
  }