The one design move

Every explicitly CVD-designed UI theme found in this research uses one of two strategies:

1. Collapse the red↔green axis onto orange↔blue (GitHub colorblind themes, hakarune terminal collection, Pierre, Gentle). “Success” green becomes blue; “danger” red becomes orange.
2. Anchor hues on a scientifically validated colorblind-safe palette (datum → Okabe–Ito; vim-dichromatic and Blinds → Paul Tol SRON; givensuman → Tol discrete rainbow).

Both often combine with a luminance backup channel: confused hues are also separated by lightness, so the distinction survives even when hue perception collapses.