Avoid Purple and Multicolor Gradients

Verbatim from the baseline-ui skill — the line that follows its blanket "NEVER use gradients unless explicitly requested" (see design-ibelick-no-gradients), singling out the two variants that are never a considered choice. Our reasoning: violet-to-fuchsia and full-spectrum rainbows are the house style of every AI design tool and every undesigned SaaS template, so shipping one tells the viewer exactly where the interface came from.

They also carry the same technical costs as any gradient — no stable contrast ratio under text, no single token to re-map in dark mode — with none of the brand justification.