body { font-family: Arial, sans-serif; background: #f5f5f5; }
.container { max-width: 800px; margin: 50px auto; background: #fff; padding: 20px; border-radius: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
button { margin: 5px; padding: 8px 12px; border: none; border-radius: 5px; background: #1db954; color: white; cursor: pointer; }
button:disabled { background: #aaa; cursor: default; }
#playlists div { border: 1px solid #ddd; margin: 5px 0; padding: 5px; border-radius: 5px; }