/* ── Shared button system ── Depends on CSS custom properties defined per-page: --midnight, --yellow, --yellow-dark, --white, --ink, --muted, --border, --sans WHY THIS FILE EXISTS Before this, the site had no button convention at all. Eight different treatments were in play, `.cta-card-btn` was copy-pasted into 48 files and `.article-cta a` into 49, `.nav-cta` was a pill on 60 pages but a 10px rect on the homepage, and exactly one button on the whole site had a focus style. HOW IT IS LOADED — this matters Every page's inline