root = Card([description, signupForm])
description = TextContent("Get a curated weekly digest of product updates, tips, and industry insights delivered straight to your inbox.", "large")
signupForm = Form("newsletter-signup", formButtons, [emailField])
emailField = FormControl("Email address", emailInput, "We respect your privacy. Unsubscribe anytime.")
emailInput = Input("email", "you@example.com", "email", ["required", "email"])
formButtons = Buttons([subscribeBtn])
subscribeBtn = Button("Subscribe", null, "primary")