src/themes/shared/_markdown.css

/* Markdown */
/* ========================================================================== */
.markdown-section {
  position: relative;
  width: var(--content-max-width);
  max-width: calc(100% - (var(--content-margin-inline) * 2));
  margin: var(--content-margin-inline) auto 0 auto;
  padding-bottom: 2rem;

  body:has(.app-nav) & {
    margin-top: calc(var(--navbar-height) + (var(--content-margin-inline) / 2));
  }

  > :first-child {
    margin-top: 0;
  }

  blockquote,
  details,
  figure,
  form,
  iframe,
  ol,
  output,
  p,
  pre,
  table,
  ul {
    margin-block: var(--margin-block);
  }

  a {
    &.anchor {
      color: inherit;

      &:not(:hover) {
        text-decoration-color: transparent;
      }

      &:hover {
        translate: 0 0 0; /* Safari Fix: Forced redraw */
        text-decoration-color: var(--link-underline-color-hover);
      }
    }
  }

  blockquote {
    position: relative;
    overflow: auto;
    margin-inline: 0;
    padding: var(--blockquote-padding);
    border: solid var(--blockquote-border-color);
    border-width: var(--blockquote-border-width);
    border-radius: var(--blockquote-border-radius);
    background: var(--blockquote-bg);
    color: var(--blockquote-color);

    > :first-child {
      margin-top: 0;
    }

    > :last-child {
      margin-bottom: 0;
    }
  }

  em {
    font-style: italic;
  }

  hr {
    margin-block: 2em;
  }

  iframe {
    display: block;
    width: 100%;
    max-width: 100%;
    border: 1px solid var(--color-mono-2);
  }

  img {
    max-width: 100%;
  }

  kbd {
    margin-inline: 0.15em;

    &.alt {
      padding: 0.5em;
      border: var(--kbd-alt-border);
      border-radius: var(--kbd-alt-border-radius);
      box-shadow: var(--kbd-alt-box-shadow);
      background: var(--kbd-alt-bg);
      color: var(--kbd-alt-color);
      font-size: var(--font-size-m);
    }
  }

  /* Callouts */
  /* ---------------------------------- */
  .callout {
    position: relative;
    margin-block: calc(var(--margin-block) * 1.5);
    padding: var(--callout-padding);
    border: solid var(--callout-border-color);
    border-width: var(--callout-border-width);
    border-radius: var(--callout-border-radius);
    background: var(--callout-bg);
    color: var(--callout-color);

    /* Charm */
    &::before {
      content: var(--callout-charm-content);
      position: absolute;
      inset: var(--callout-charm-inset);
      height: var(--callout-charm-size);
      width: var(--callout-charm-size);
      translate: var(--callout-charm-translate);
      border-radius: var(--callout-charm-border-radius);
      background: var(--callout-charm-bg);
      color: var(--callout-charm-color);
      font-size: var(--callout-charm-font-size);
      font-weight: var(--strong-font-weight);
      line-height: var(--callout-charm-size);
      text-align: center;
    }

    code,
    strong {
      color: inherit;
    }

    code {
      background: rgba(0, 0, 0, 0.08);
    }
  }

  /* Code, Output, Samp */
  /* ---------------------------------- */
  code,
  output,
  pre {
    border-radius: var(--border-radius);
  }

  code,
  pre,
  samp {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-mono);
  }

  output,
  pre[data-lang] {
    position: relative;

    &::after {
      content: attr(data-lang);
      position: absolute;
      top: 0.5rem;
      right: 0.5rem;
      color: inherit;
      font-family: var(--font-family);
      font-size: var(--font-size-xs);
      letter-spacing: 0.02em;
      line-height: 1;
      opacity: 0.5;
    }
  }

  code,
  samp {
    white-space: pre-wrap;
  }

  code {
    margin: 0 0.1em;
    padding: 0.2em 0.35em;
    background: var(--code-bg);
    color: var(--code-color);

    .token {
      position: relative;
      left: auto;
    }
  }

  output {
    display: block;
    padding: 1.7rem 1.4rem 1.4rem;
    border: 1px solid var(--color-mono-2);

    > :first-child {
      margin-top: 0;
    }

    > :last-child {
      margin-bottom: 0;
    }
  }

  pre[data-lang] {
    /* NOTE: !important declaration are intended to override third-party Prism theme values */
    padding: 0 !important;
    border-radius: var(--border-radius) !important;
    font-family: var(--font-family-mono) !important;
    font-size: var(--font-size-mono) !important;
    line-height: inherit !important;
    tab-size: 2 !important;
    text-align: left;
    white-space: pre;
    word-spacing: normal;
    word-wrap: normal;
    word-break: normal;
    hyphens: none;

    &:only-child {
      margin: 0;
    }

    > code {
      display: block;
      overflow: auto;
      margin: 0 !important;
      padding: 0 !important;
      padding-block: 1.5rem !important;
      padding-inline: 1.5rem !important;
      background: inherit;
      color: inherit;
      font-size: inherit;
      white-space: inherit;
    }
  }

  samp {
    font-weight: var(--strong-font-weight);

    .token {
      position: relative;
      left: auto;
    }
  }

  /* Headings */
  /* --------------------------------- */
  :where(h1, h2, h3, h4, h5, h6) {
    margin: 2rem 0 0.5em;
    color: var(--heading-color);
    font-weight: var(--heading-font-weight);

    /* Prevent long titles from causing horizontal scrolling */
    &[id] a {
      display: block;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }

  h1,
  h2 {
    margin-top: 2.5rem;
  }

  :is(h1, h2, h3, h4, h5, h6) + * {
    margin-top: 0;
  }

  h1 {
    font-size: var(--font-size-xxxl);

    &:first-of-type {
      margin-top: 0;
    }
  }

  h2 {
    --_spacing: 0.5em;

    margin-bottom: calc(
      var(--_spacing) + (var(--heading-line-height) - var(--font-size-xxl))
    );
    padding-bottom: var(--_spacing);
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-xxl);
  }

  h3 {
    font-size: var(--font-size-xl);
  }

  h4 {
    font-size: var(--font-size-l);
  }

  h5 {
    font-size: var(--font-size-m);
  }

  h6 {
    &,
    & + :not(h1, h2, h3, h4, h5) {
      font-size: var(--font-size-s);
    }
  }

  /* Lists */
  /* ---------------------------------- */
  ol,
  ul {
    margin: 0;
    padding-inline-start: 1.5em;

    & & {
      margin-top: 0.25em;
    }
  }

  li {
    &:not(:last-child) {
      margin-bottom: 0.25em;
    }
  }

  ul.task-list {
    --_checkbox-margin: 0.2em;
    --_checkbox-offset: 1.6em;

    padding-inline-start: 0.6em;

    input[type='checkbox'] {
      margin-top: -0.15em;
      margin-right: var(--_checkbox-margin);
      margin-left: calc(0px - var(--_checkbox-offset));
    }

    li {
      position: relative;
      margin-top: var(--_checkbox-margin);
      margin-bottom: var(--_checkbox-margin);
      margin-left: var(--_checkbox-offset);
      list-style-type: none;

      /* Vertical Connector */
      &:has(.task-list) {
        &::before {
          content: '';
          position: absolute;
          z-index: -1;
          top: 1em;
          left: -1em;
          bottom: 0;
          border-left: 1px solid var(--color-mono-2);
        }
      }
    }

    ul.task-list {
      padding-inline-start: 1.5em;

      li {
        margin-left: var(--_checkbox-margin);
      }

      > li {
        /* Horizontal Connector */
        &::after {
          content: '';
          position: absolute;
          z-index: -1;
          top: 0.9em;
          left: -2.7em;
          width: 1.25em;
          border-top: 1px solid var(--color-mono-2);
          border-left: none;
        }

        /* Horizontal Connector + Mask */
        &:last-child {
          &::after {
            bottom: 0;
            background: var(--color-bg);
          }
        }
      }
    }
  }

  /* Tables */
  /* ---------------------------------- */
  th,
  td {
    padding: 0.25em 0.75em;
    border: 1px solid var(--color-mono-2);
  }

  table {
    display: block;
    width: 100%;
    overflow: auto;
    border-collapse: collapse;
    border-spacing: 0;
  }

  thead {
    display: none;
    font-weight: var(--strong-font-weight);
    text-align: left;

    &:has(th:not(:empty)) {
      display: table-header-group;
    }
  }

  th {
    font-weight: var(--strong-font-weight);

    &:not([align]) {
      text-align: left;
    }
  }

  tr {
    border-top: 1px solid var(--color-mono-2);

    &:nth-child(2n) {
      background: var(--table-row-alt-bg);
    }
  }
}