#upload-area {
    border: 2px dashed #ced4da;
    border-radius: 0.5rem;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}
#upload-area:hover {
    border-color: #0d6efd;
    background-color: #f8f9fa;
}
#upload-area.active {
    border-color: #198754;
    background-color: #f1f9f7;
}
.grid-preview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    margin: 1rem 0;
    border: 1px solid #ddd;
    padding: 2px;
}
.grid-item {
    width: 100%;
    height: 0;
    padding-bottom: 100%;
    position: relative;
    overflow: hidden;
}
.grid-item img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.download-btn {
    margin-top: 1rem;
}