.logo-container {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #F2F3F5;
}
.logo-image {
    max-height: 80px;
    max-width: 100%;
    object-fit: contain;
}

.page-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1.5rem; 
}

.video-container {
    width: 100%;
    height: 320px; 
    position: relative;
    background-color: #000; 
    border-radius: 0; 
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); 
    margin: 0 0 2.5rem 0; 
    display: block;
}
.video-container video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background-color: #000; 
}

.video-loader {
    position: absolute;
    inset: 0;
    background-color: #000; 
    display: none;
    align-items: center;
    justify-content: center;
}
.loader {
    width: 4rem;
    height: 4rem;
    border: 4px solid #E5E7EB;
    border-top-color: #165DFF;
    border-radius: 50%;
    animation: spinner 0.8s linear infinite;
}
@keyframes spinner {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.category-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #F2F3F5; 
}
.category-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    color: #1D2129;
}
.category-item:hover, .category-item.active {
    color: #165DFF;
    transform: translateY(-2px);
}
.category-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 10%;
    object-fit: cover;
    margin-right: 0.8rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.category-name {
    font-size: 1.1rem;
    font-weight: 500;
}

.video-list {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 1rem;
}
@media (min-width: 760px) {
    .video-list {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width: 1024px) {
    .video-list {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
}

.video-image-container {
    position: relative;
    width: 100%;
    height: 135px;
    overflow: hidden;
    border-radius: 0.75rem 0.75rem 0 0;
    cursor: pointer;
}
.video-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}
.video-tooltip {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.8rem;
    background-color: rgba(0,0,0,0.8);
    color: #FFFFFF;
    font-size: 0.85rem;
    line-height: 1.4;
    max-height: 100%;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.video-image-container:hover .video-tooltip {
    opacity: 1;
    visibility: visible;
}
.video-image-container:hover .video-image {
    opacity: 0.8;
}

.video-item {
    background-color: #FFFFFF;
    border-radius: 0.75rem;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 2px solid transparent;
}
.video-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.12);
}
.video-item.highlight {
    border-color: #165DFF;
    background-color: #F0F7FF;
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.15);
}

.video-item-content {
    padding: 0.8rem;
}
.video-title {
    font-size: 1rem;
    font-weight: 600;
    color: #1D2129; 
    margin: 0;
    cursor: pointer;
    transition: color 0.3s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.video-item.highlight .video-title,
.video-image-container:hover ~ .video-item-content .video-title {
    color: #165DFF;
}
.video-title:hover {
    color: #165DFF;
}

@media (max-width: 767px) {
    .video-container {
        height: 200px; 
        margin: 0 0 2rem 0;
    }
}