Pick a mood in the bar above, or hit Randomise. The whole page re-skins instantly - because every colour here is a token, and the tokens are now a control surface. Your choice is remembered.
Backgrounds, borders, tags and headings all read from the same ten tokens - so they move together the instant you change the palette.
Primary fills with the accent, text flips to its paired on-accent colour for contrast - automatically, in any palette you throw at it.
Heading, body and muted are distinct tokens, so hierarchy survives a jump from a bright Paper to a deep Neon without a single edit.
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The switcher writes ten CSS custom properties onto the page root; every rule references them, so the browser repaints the whole design in one frame. The randomiser builds a fresh, coherent palette from a single hue with a little HSL maths. No reload, no framework, about ninety lines of vanilla JavaScript - and it doubles as a live demo of lazysite's token model.