.upload-zone {
    border: 2px dashed var(--bs-secondary);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.upload-zone.dragover {
    border-color: var(--bs-primary);
    background-color: rgba(var(--bs-primary-rgb), 0.1);
}

.upload-zone i {
    color: var(--bs-secondary);
}

.toast {
    background-color: var(--bs-dark);
}

.btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}