:root{
  /* Active Font Theme: Fira Sans + Fira Math */
  --font-core:"Fira Sans",sans-serif;
  --font-mono:"JuliaMono",ui-monospace,"SFMono-Regular",monospace;
  --font-caption:"Fira Sans",sans-serif;
  --font-math:"Fira Math","Fira Sans",sans-serif;

  /* To revert back to XITS Serif Theme:
  --font-core:"XITS","STIX Two Text","Times New Roman",serif;
  --font-caption:Arial,Helvetica,sans-serif;
  --font-math:"XITS Math","XITS","STIX Two Math",serif;
  */

  /* Slide-scale sizes, in px at the deck's native 1536x864 canvas.
     (PowerPoint pt values x 4/3.) */
  --size-hero:110px;      /* ctrTitle default, 83.2pt */
  --size-title-slide:72px;/* title-slide H1 as authored, 54pt */
  --size-subtitle:60px;   /* subTitle default, 44.8pt */
  --size-title:59px;      /* section title, 44pt master default */
  --size-title-long:53px; /* long titles step down, 40pt */
  --size-lead:43px;       /* pull question, 32pt */
  --size-figure-label:40px;/* figure captions, 30pt */
  --size-body:37px;       /* body/bullet default, 27.6pt */
  --size-body-sub:29px;   /* nested bullets and figure credits, 22pt */
  --size-math:40px;       /* display equations, matched to the figure-label size */
  --size-step:32px;       /* JuliaMono pipeline step, 24pt */
  --size-label:27px;      /* in-diagram label, 20pt */
  --size-meta:21px;       /* slide number, 16pt */

  --leading-tight:1;      /* every placeholder in the deck is lnSpc 100% */
  --leading-body:1.18;
  --weight-regular:400;
  --weight-bold:700;      /* used sparingly; titles are regular weight */
  --tracking-none:0;
}