.audio-player-container {
    max-width: 500px;
    margin: 20px 0;
}
.progress-bar {
    display: flex;
    align-items: center;
    margin: 10px 0;
}
.progress {
    flex-grow: 1;
    height: 10px;
    background: #ddd;
    margin: 0 10px;
    position: relative;
}
.progress-filled {
    height: 100%;
    background: #0073aa;
    width: 0;
}
.playlist-items {
    list-style: none;
    padding: 0;
}
.playlist-items li {
    padding: 10px;
    cursor: pointer;
}
.playlist-items li:hover, .playlist-items li.active {
    background: #f0f0f0;
}