- Add Open Props as the token foundation (@import "open-props/style"). Our
semantic tokens (--bg/--surface/--border/--text/--shadow-*/--transition) are
now backed by its gray ramp, shadows and easing; the rest of the CSS is
untouched since it already references var(--…).
- Accent → indigo #4f46e5 (--accent + derived rings / month-hover), and the
timeline bar default colours (appearance.ts) move to the same indigo so the
content and UI share one palette.
- Font → IBM Plex Sans, self-hosted via @fontsource (latin + cyrillic, weights
400/500/600/700) so there is no runtime Google Fonts dependency. Backed into
--font-sans (overrides Open Props' :where() default). Tabular figures on the
counters and map legend.
- Collision default colour → warm amber-orange #e8590c: distinct from the indigo
bars and from the green/red map status, reads as a conflict warning.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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