f562df8437
The heading color override (bare h1 selector, specificity 0,0,1) was losing to Pico's theme-scoped heading rules ([data-theme=light] h1, specificity 0,1,1). On systems with prefers-color-scheme: dark, Pico's dark heading colors (#f0f1f3 — near white) leaked through, making headings invisible on the light background. Fix: scope heading overrides under [data-theme="light"] to match Pico's specificity. Also bump nav logo from 24px to 32px, footer to 24px. Visual tests now run with color_scheme="dark" to catch this class of bug. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>