Interactive card details form (Html,Css(Sass),Js)

Hi everyone, in this challenge I had some difficulties regarding the management of form errors, in particular regarding the control of the text inserted in the various inputs, and that it was in line with the characters allowed for each type of input.

Also regarding the card number field as I had to understand how to automatically divide the numbers into blocks of 4, but thanks to the help of some online resources I managed to understand how it could work;

if you like, you could leave me a feedback regarding my code solution (Js side especially) I would be really happy and as always, for any constructive criticism or question I'm here and we can talk about it ;)