Developer builds Klein blue terminal theme after finding pure IKB unreadable as text

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A developer who uses Claude Code extensively created a custom terminal theme optimized for reading long-form prose rather than syntax highlighting. The theme is anchored to Yves Klein's IKB ultramarine pigment (hex 002FA7), patented in 1960, but pure IKB proved unreadable as text on dark backgrounds due to a near-zero APCA legibility score. To work around this, the developer split the color across two terminal slots — using pure IKB decoratively and a lighter Klein-family blue for readable permission-prompt text. The theme ships in four variations, with the strictest version requiring all color roles to meet defined APCA contrast thresholds for body text, subtle text, and accents. It is built as macOS Terminal.app profile files with install and rollback scripts, and requires Claude Code's theme setting to be switched to dark-ansi mode to function correctly.

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