Primitives

shimmer sweeps a sheen on hover. It composes with any variant, is pure CSS (no motion runtime, nothing added to the bundle), and does not sweep under prefers-reduced-motion. For a marketing CTA — not a row action.

burst throws a puff of themed particles from the point you pressed. The simulation is lazy — its chunk is fetched on the first press and never before, so a plain button pays nothing — and it is deliberately 2D canvas, not WebGL: a browser allows only a handful of live WebGL contexts, so a button that opened one per press would break a real toolbar and evict the hero effect running elsewhere on the page. Reduced motion gets the click without the puff. Save it for a moment worth celebrating; on a row action pressed forty times a day it is noise.