Rovin Footer — Référence de design web et prompt

# Prompt: Rovin "Chrome Orbit" footer

Build a single-file, one-screen **footer for a fictional travel-money app, Rovin**. Use plain HTML, CSS and vanilla JS, with no framework and no build step. The look is near-black with a huge glossy chrome sphere of stacked rings lit with ice-blue rim light. The sphere fills the lower right. Above it is a giant two-tone headline, footer link columns sit on the left, and three small frosted-glass feature cards float over the sphere.