.video-library {
    margin-bottom: 30px;
}
.video-item {
    margin-bottom: 20px;
}
.thumbnail-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* Tỷ lệ 16:9 */
    height: 0;
    overflow: hidden;
    border-radius: 5px;
}
.thumbnail-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.thumbnail-wrapper .play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(0, 0, 0, 0.5); /* Nền bán trong suốt */
    border: 2px solid #fff; /* Viền trắng */
    border-radius: 50%; /* Hình tròn */
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0.8;
    transition: opacity 0.3s;
}
.thumbnail-wrapper .play-icon i {
    font-size: 24px; /* Kích thước icon play */
    color: #fff;
}
.thumbnail-wrapper:hover .play-icon {
    opacity: 1;
}
.video-item h3 {
    font-size: 16px;
    margin: 10px 0;
}
.video-tabs {
    display: flex;
    overflow-x: auto;
    margin-bottom: 20px;
    white-space: nowrap;
}
.video-tabs a {
    padding: 5px 15px;
    border-radius: 5px;
    margin-right: 10px;
    border: 2px solid #ddd;
    text-decoration: none;
    color: #333;
    cursor: pointer;
}
.video-tabs a.active,
.video-tabs a:hover {
    background: #00537b;
    color: #fff;
    border-color: #0073aa;
}
.video-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}
.video-popup iframe {
    width: 80%;
    max-width: 800px;
    aspect-ratio: 16 / 9;
}
.video-popup .close {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 30px;
    color: #fff;
    cursor: pointer;
}
.pagination {
    text-align: center;
    margin-top: 20px;
}
.pagination a, .pagination span {
    padding: 5px 10px;
    margin: 0 5px;
    border: 1px solid #ddd;
    border-radius: 3px;
}
.pagination a:hover, .pagination .current {
    background: #0073aa;
    color: #fff;
    border-color: #0073aa;
}
@media (max-width: 767px) {
    .video-library {
        display: block;
    }
    .video-item {
        width: 100%;
    }
    .thumbnail-wrapper .play-icon {
        width: 50px;
        height: 50px;
    }
    .thumbnail-wrapper .play-icon i {
        font-size: 20px;
    }
}