Less text, more showing. I read your landing page twice and can't recall anything except "something, something flashcards". Sign up is "hidden" somewhere up right.

Assume i'm an idiot, the sign up form needs work, clicking the placeholder and _then_ typing is one action too much.

Style your form in a universally accepted fashion, not what out think looks good (i'm talking out of my ass here, but that's what i noticed at first glance)

Edit: Why is there a sign-in link on the sign in page, whut