:root {
  --side-width: 200px;
  --side-gap: 2em;
  --side-margin: calc(0px - var(--side-width) - var(--side-gap));
}
body, blockquote, .side { background: #fafafa; }
.body, .body ~ .appendix, .frontmatter, .fullwidth, .embed-left, .embed-right {
  margin-top: 2em;
  padding: 1em;
  box-shadow: 0 0 8px #ccc;
  background: #fff;
}
.appendix, .footnotes, .body .side { font-size: .9em; }
.body ~ .appendix, .frontmatter { background: none; }
.appendix h2 { border-bottom: 1px dashed #666; }
#TOC { top: 0; }
.bg-number {
  padding: 1px 5px;
  border-radius: 5px;
  background: lightslategray;
  color: #fff;
}
div:not(.body):has(> table) { overflow-x: auto; }

/* left/right elements*/
.side {
  width: var(--side-width);
  margin: 0 auto;
  max-height: 100vh;
  overflow: auto;
}
.side-left {
  float: left;
  clear: left;
  margin-left: var(--side-margin);
  &:not(.body > *) {
    margin-left: calc(var(--side-margin) + 1em);
  }
  position: sticky;
}
.side-right {
  float: right;
  clear: right;
  margin-right: var(--side-margin);
}
.quote-left, .quote-right { width: 45%; }
.embed-left, .embed-right {
  margin-top: auto;
  padding: 0;
}
.quote-left, .embed-left {
  float: left;
  margin-right: 1em;
}
.quote-right, .embed-right {
  float: right;
  margin-left: 1em;
}
.embed-left { margin-left: var(--side-margin); }
.embed-right { margin-right: var(--side-margin); }
:is(.side, .embed-left, .embed-right) > :first-child { margin-top: 0; }
:is(.embed-left, .embed-right) > :last-child { margin-bottom: 0; }
:is(.quote-left, .quote-right) {
  & > :first-child { padding-top: .1px; }
  & > :last-child { padding-bottom: .1px; }
}

/* wide elements */
.fullwidth {
  max-width: calc(100vw - 2em);
  margin: 1em 0 1em 50%;
  transform: translateX(-50%);
  float: left;
  min-width: 100%;
  background: #fff;
  & * {
    max-width: calc(100vw - 4em);
    margin: auto 0;
  }
  & :is(figcaption, .caption) {
    margin-left: calc(50% - 400px);
    width: 800px;
    padding: 1em 1em 0;
  }
}
.fullscroll {
  & * { max-width: initial; }
  &, & figure, & .figure { overflow-x: auto; }
}

@media (min-width: 1264.02px) {
  #TOC.side {
    .active {
      color: limegreen;
    }
    li li .active {
      border-left: 3px solid;
      margin-left: calc(-1em - 3px);
      padding-left: 1em;
    }
    &:has(.active) li:not(:has(.active)) ul {
      display: none;
    }
  }
  .note-ref { cursor: pointer; }
  .note-ref:hover + .side {
    display: inline-block;
    background: #f8f8f8;
    position: absolute;
    z-index: 1;
    margin-left: 1em;
    padding: .5em;
    box-sizing: content-box;
  }
}
@media (max-width: 1264px) {
  body:not(.pagesjs) {
    #TOC {
      border: 1px solid #eee;
      border-radius: 5px;
      padding: 1em;
      position: initial;
      float: none;
      columns: 2;
    }
    .side { width: 100%; }
    :is(main, .body) .side {
      padding: 0 2em;
      color: darkslategray;
    }
    .side-left, .side-right {
      clear: both;
      margin: 1em auto;
      background: none;
    }
    :not(.note-ref) + .side { float: none; }
    .footnote-ref + .footnotes { float: left; }
    .side > :last-child { margin-bottom: 0; }
    .embed-left, .embed-right {
      float: inherit;
      margin: auto;
      padding: 1em;
    }
  }
}
@media (max-width: 800px) {
  body:not(.pagesjs) {
    padding: initial;
    main, .body { padding: 0 .5em 0; }
    #TOC { columns: 1; }
    :not(pre) > code { word-break: break-word; }
    .quote-left, .quote-right {
      width: inherit;
      float: inherit;
      margin: auto;
    }
    .fullwidth {
      margin: initial;
      transform: initial;
      float: none;
      min-width: initial;
      background: none;
      border: none;
      & :is(figcaption, .caption) {
        margin: initial;
        padding: initial;
      }
      &:not(.fullscroll) * { max-width: 100%; }
    }
  }
}

@media print {
  body {
    background: none;
  }
}