Very fun!
Just a question:
Was there a reason why you chose 3 instead of 4 (as in 4 suits of cards that you were emulating)?
And a suggestion:
If you wanted to develop this so that it could be used to actually print out cards at some point, it might be nice to add an option to convert your click to copy into a QR code or something so that one could get the code from a printed card into a notebook with greater ease than having to type what you see on an actual card.