:root{
--font-display:'Instrument Sans',system-ui,sans-serif; /* headings 700, tight tracking */
--font-ui:'Instrument Sans',system-ui,sans-serif;      /* everything human-readable — 85% of the UI */
--font-mono:'IBM Plex Mono',ui-monospace,monospace;    /* DATA ONLY (~15%): versions, regions, route chains, confidence, ids */
--text-xs:11px;--text-sm:12px;--text-base:14px;--text-md:15px;--text-lg:17px;--text-xl:20px;--text-2xl:26px;--text-3xl:34px;--text-4xl:42px;
--leading-tight:1.1;--leading-snug:1.3;--leading-normal:1.55;
--tracking-tight:-0.02em;--tracking-wide:0.18em;
/* Data-label pattern: mono, 10-11px, uppercase, tracking-wide. Section headings are plain sans ("Screenshots"), NEVER mono-caps. */
--weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;
}