interactive card details JS html/css flexbox

Hi I think this is the hardest challenge I finished, but I was finis it and I am proud of myself. I learned a lot of stuff: css positioning elements, regular expresions, Js validate inputs and a few more. It took me a long time but I done without cheating (looks in to another users code).

I focused on good view on every devices and add a small animations to cards(@keyfames).

My code validate all inputs and show properly info when data is not valid.

Any feedback will be apreciated specialy for JS code, because I don't know I do in good way but ist work:)

Enjoy with testing my solution:D