.video-list-item.active {
    background-color: #EFF6FF;
    border-left: 4px solid #3B82F6;
}

#videoPlayer {
    aspect-ratio: 16/9;
}

.duration-badge {
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 0.75rem;
    padding: 0.15rem 0.3rem;
    border-radius: 0.25rem;
    position: absolute;
    bottom: 0.25rem;
    right: 0.25rem;
}

@media (max-width: 768px) {
    .player-container {
        flex-direction: column;
    }
    .video-list-container {
        max-height: 300px;
        overflow-y: auto;
    }
}