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Fix colorblind mode: add missing CSS rules - #13
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The JS correctly set data-cb on <html> and persisted to localStorage, but no CSS rules existed to actually change colors. Added: - CSS variable overrides (--neon, --accent, --map-*) for each of the 4 modes (deutan, protan, tritan, achro) - CSS filters on .zonemap and .map-zoom-wrap svg to adjust hardcoded SVG colors (hue-rotate/sepia for deutan/protan/tritan, grayscale for achro) - Test suite: tools/test_colorblind.py (30 checks)
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The JS correctly set data-cb on the html element and persisted to localStorage, but no CSS rules existed to actually change colors — selecting a colorblind mode had no visible effect.
Adds CSS variable overrides and CSS filters for all 4 modes (deutan, protan, tritan, achro), plus a 30-check test suite.