VeilGuard CTA — Référence de design web et prompt

# Prompt: VeilGuard AI communication firewall hero

Build a single-file, one-screen **hero for a fictional AI compliance company, VeilGuard**. Use plain HTML, CSS, inline SVG and vanilla JS, with no framework and no build step. The look is near-black with a sweeping violet and magenta light ribbon arcing across the frame. A bold white headline is left-aligned, and on the right a dark glass card shows a "firewall" flow: Email, Doc and Post inputs pass through a shield hub and come out marked "Clean".