/* institution.css: the site house style (design/styles/institution/meta.md, decision #799, 2026-08-28). Load AFTER /lab2/styles.css on any page whose carries class "inst". Owns the tokens, the Inter faces, the header/footer skin (markup stays the site's; verify-ia check 4 keeps the nav byte-identical), and the shared compositions (hero, proof strip, section head, ruled rows, notes, system cards, about strip). Page-specific composition stays in each page's own