.video-container {
  overflow: hidden;
  position: relative;
  width: 100%;
}

.video-container::after {
  padding-top: 56.25%;
  display: block;
  content: '';
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#toc-sidenav {
  max-width: 30rem;
  overflow-y: scroll;
  max-height: 80vh
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("/fonts/IBMPlexSans-Regular.woff2") format("woff2"),
       url("/fonts/IBMPlexSans-Regular.woff") format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("/fonts/IBMPlexSans-Medium.woff2") format("woff2"),
       url("/fonts/IBMPlexSans-Medium.woff") format("woff");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("/fonts/IBMPlexSans-Bold.woff2") format("woff2"),
       url("/fonts/IBMPlexSans-Bold.woff") format("woff");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

h1, h2, h3, h4, h5, h6 {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-weight: 700; /* bold */
}

:root { --bs-body-font-family: "IBM Plex Sans", sans-serif; }