.track-item {
    cursor: pointer;
}
.track-item:hover {
    background-color: #f8f9fa;
}
.track-item.active {
    background-color: #e9ecef;
    color: #000;
    border-left: 3px solid #007bff;
}
.track-item.active img {
    opacity: 1;
}
.track-item.active .duration,
.track-item.active a {
    color: #000;
}
#waveform {
    width: 100%;
    height: 128px;
}
#progressCanvas {
    width: 100%;
    height: 20px;
    margin-bottom: 10px;
}
#oscilloscope {
    width: 100%;
    height: 100px;
    padding: 5px;
    border-radius: 10px;
    margin-top:10px;
    background: linear-gradient(to bottom, #000, #040);

}
#visualizerCanvas {
    width: 100%;
    height: 150px;
    background-color: #000;
    padding: 10px;
    background: linear-gradient(to bottom, #000, #448);
    border-radius: 10px;
}