/* Custom scrollbar for sidebar */
.chapter-list::-webkit-scrollbar {
    width: 4px;
}
.chapter-list::-webkit-scrollbar-track {
    background: transparent;
}
.chapter-list::-webkit-scrollbar-thumb {
    background-color: rgba(156, 163, 175, 0.5);
    border-radius: 20px;
}
.active-video {
    background-color: #eff6ff;
    color: #2563eb;
    border-left: 3px solid #2563eb;
}