A pricing section built as one shallow tank: an SVG water line runs behind the whole tier row and each card is a hydrometer float riding it, heavier (cheaper) tiers sitting lower and the recommended tier riding highest, with the billing toggle changing the brine's density so a price change is felt as buoyancy.
pnpm dlx shadcn@latest add "https://design.helpmarq.com/r/brine-float.json"