Interactive Card Details Form (CSS/Typescript w/ Full Form Validation)

What I thought would be a quick challenge turned out to be a lot more work than I had anticipated. I really wanted to get the form validation done well, but I underestimated how many edge cases I'd have to look out for. The credit card number field was especially hard to get working 100%, but I'm happy with where I got it.

I added a few extras:

• The credit card field will only allow number input but will automatically generate spaces
• The fields will automatically tab over once the field has reached the maximum input length
• Form won't allow submission until all fields are valid
• When you click on the Confirm / Continue button, that part of the page will fade out/in

Any feedback/comments is always appreciated!