body{font-family:Arial,sans-serif;max-width:600px;margin:0 auto;padding:20px;text-align:center}button{background-color:#4caf50;border:none;color:#fff;padding:10px 20px;text-align:center;text-decoration:none;display:inline-block;font-size:16px;margin:10px 5px;cursor:pointer;border-radius:5px}button:disabled{background-color:#ccc;cursor:not-allowed}#audioVisualizer{width:100%;height:100px;background-color:#f0f0f0;margin:20px 0;position:relative}#status{margin:15px 0;font-weight:700}canvas{position:absolute;top:0;left:0;width:100%;height:100%}select,label{padding:8px;margin:10px 0;font-size:16px}