% Contrast + dark-mode regression fixture (2026-04-17 audit fixes). % Exercises: % C3 — current state fill #0070d5 (was #0090ff, failed WCAG AA at 3.26:1) % path state with darkened text #5e6669 (was #687076, failed at 4.10:1) % dim state retained at #687076 (passes at 4.53:1) % Annotation pill labels: warn #92600a, error #c6282d on white pill % H5 — arrowhead <polygon> and pill <rect> dark-mode styling % H6 — prefers-color-scheme OS-level dark mode