/* Only in the live HTML deck (build.sh links it; the PDF never sees it).
   .nur-pdf: things for the handout, e.g. QR codes to demos that run on the slide anyway. */
.nur-pdf { display: none !important; }
.demoqr:has(> .nur-pdf) { grid-template-columns: 1fr !important; }

/* data-reveal: theme/clicker.js shows these one per clicker press. */
[data-reveal]:not(.shown) { visibility: hidden; }