:root{
  --font-head:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --head-weight:600; --head-lead:1.12; --head-track:-.02em; --lead:1.58;
  --step-0:clamp(1.0625rem,1.02rem + .2vw,1.125rem);
  --step-6:clamp(2.3rem,1.5rem + 3.6vw,3.75rem);
}