Another thing… If You want to style the blocks & controls – why not just make css file for it and just add it to backend like:
add_action('admin_head', 'my_custom_acf_styles');
function my_custom_acf_styles() {
echo '<style>
.my-field-class {
font-family: "Lucida Grande";
font-size: 12px;
}
</style>';
}