Use this skill when the user wants to build a sober developer-API marketing landing in the Resend style — pure-black canvas, stark white type, a single "envelope opens" hero animation with a slow flap on a precise cubic-bezier, prominent mono code blocks with blue-grey string tokens, hairline-bordered feature cards built from a 1px-gap-on-tinted-bg lattice, and very few infrastructure-grade words on the page.
