/* Grid ảnh cho trang VF3 */
.grid-image-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 100%; /* Tạo tỷ lệ 1:1 */
    overflow: hidden;
}

.grid-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.3s ease;
    border-radius: 0;
}

.grid-image:hover {
    transform: scale(1.05);
}

.vf3-image-grid {
    width: 100%;
    max-width: 1200px;
    margin: 40px auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
}

.lightbox-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.close {
    position: absolute;
    top: 30px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
}

.close:hover {
    color: #bbb;
}

/* Responsive design */
@media (max-width: 768px) {
    .vf3-image-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .vf3-image-grid {
        grid-template-columns: 1fr;
    }
}