How to use CSS contrast-color() for auto-contrast
SMRTR summary
CSS contrast-color() and container style queries now let browsers handle automatic WCAG-compliant theming without JavaScript. By setting two custom properties on a card component, the browser calculates luminance natively, picks black or white text, and derives border colors using relative color syntax. No SSR hydration mismatches, no token conversion headaches, and graceful fallbacks for older browsers.
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