.drop-zone {
    border: 2px dashed #495057;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.05);
}

.drop-zone.uploading {
    pointer-events: none;
    opacity: 0.6;
}