feat(a11y): add OKLCH-derived text contrast for high contrast mode #18
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Implements mathematically-derived text colors for prefers-contrast: more media query using OKLCH color space for perceptual uniformity. All values verified to exceed WCAG 2.1 SC 1.4.6 AAA requirements (7:1+): - Light themes: #171411/#47413b (15.2:1 and 8.8:1) - Dark themes: #fafafa/#d4d4d4 (15.9:1 and 11.3:1) - Coffee themes: #1f130c/#452e1e (14.6:1 and 10.1:1) Key improvements: - Reduced eye fatigue by avoiding pure black on light themes - Maintained theme color temperature (warm/neutral) for visual harmony - Enhanced secondary text contrast on coffee theme (7.3:1 → 10.1:1) Closes #15
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Summary
prefers-contrast: moremedia query using OKLCH color spaceColor Math (OKLCH Perceptual Model)
oklch(0.12 0.008 70)oklch(0.32 0.012 70)oklch(0.98 0.003 0)oklch(0.85 0.006 0)oklch(0.15 0.045 50)oklch(0.30 0.055 50)Key Improvements
Test Plan
Closes #15