Claude Code is mostly paragraphs. Tool output, reasoning traces, permission prompts — I read dense prose for hours in a terminal built around syntax highlighting conventions, where "readable" means "your keywords pop." That's the wrong optimization when your screen is 80% English at body size.
I built klein-blue to fix that. Four variations, all anchored to Yves Klein's IKB pigment, all verified against APCA contrast targets for prose reading rather than syntax pop.
The problem that shaped the design: pure IKB fails APCA contrast as text on a dark ground — Lc -12, effectively invisible. So the themes split Klein across two ANSI slots. ansi:blue gets pure IKB for decorative borders and highlights where contrast doesn't matter. ansi:blueBright gets a lifted Klein-family blue for permission-prompt text that actually needs to be read.
The four variations exist because one question doesn't have a single answer: how should Claude Code's brand color (that burnt sand/orange, routed through ansi:redBright) live in your terminal?
Klein Void Refined — neutralizes the brand color, lets IKB run the room
