/* Maths in the brand math font (IBM Plex Sans, common/brand.json), not KaTeX's serif.
   KaTeX's own fonts stay only for radicals, big operators (Σ) and stretchy brackets.
   Used by the video (tex.tsx) and copied next to every generated page (tools/chapter.mjs). */
.katex { font-family: var(--font-body, "IBM Plex Sans"), KaTeX_Main, sans-serif; font-size: 1.04em; }
.katex .mathnormal, .katex .mathit, .katex .boldsymbol { font-family: var(--font-body, "IBM Plex Sans"), KaTeX_Math; font-style: italic; }
.katex .mathrm, .katex .textrm, .katex .text, .katex .mord.text, .katex .mainrm, .katex .mathbf { font-family: inherit; font-style: normal; }
.katex .mfrac .frac-line { border-bottom-width: 0.06em; }