Choosing colors that remain readable across states

Evaluate color pairs in the actual interface, not as isolated swatches. Check body text, links, buttons, focus indicators, warnings, and disabled states on both light and dark backgrounds.

Use a contrast checker for legibility, but also inspect small type and visual comfort. Do not rely on hue alone to signal an error or success; labels and icons make the meaning clearer. Record the chosen values and roles for consistent reuse.

Which foreground and background pair is uncertain?