A design system that builds hierarchy the way a prism builds a spectrum — bending one beam of light into order. Focused surfaces glow, a single caustic line carries the rhythm, and only the sharpest edges disperse into colour.
Caustic doesn't decorate with glass — it borrows three real properties of light and lets them do the work of borders, fills, and dividers.
The brighter a surface catches the light, the more it matters. Focus is a glow on the edge, not a heavier box or a louder colour.
A single spectral light-line runs through the page in place of rules and section breaks — refraction, not horizontal lines.
Only the highest-contrast edges split into a thin rainbow fringe. Spend the spectrum sparingly and it always reads as a signal.
Every pane is a lens. It stays clear and translucent; the system only changes how light moves across it.
Cyan, rose, and amber are the system's three highlighters — the same light, dispersed. Each owns a register; together they never muddy.
Focus, primary action, live transmission. The first thing the eye should catch.
Emphasis and secondary action — the fringe that marks a sharp, high-contrast edge.
Caution and warmth, held to the edges so it never overpowers the cool field.
Tokens, components, and the refractive material — everything you need to make hierarchy from caustics instead of boxes.