/* Headings — Marx keeps its 500 weight (lighter than typeset's 600). */
:where(h1, h2, h3, h4, h5, h6) {
  color: inherit;
  font-weight: 500;
  line-height: 1.2;
  text-wrap: balance;
}

:where(h1) {
  font-size: var(--marx-text-h1);
}

:where(h2) {
  font-size: var(--marx-text-h2);
}

:where(h3) {
  font-size: var(--marx-text-h3);
}

:where(h4) {
  font-size: var(--marx-text-h4);
}

:where(h5) {
  font-size: var(--marx-text-h5);
}

:where(h6) {
  font-size: var(--marx-text-h6);
}

/* Tighten tracking on display-size headings; large system sans looks loose
   at its default spacing. */
:where(h1, h2) {
  letter-spacing: -0.01em;
}

/* h1/h2 open a section with more air than the sub-headings (old Marx cadence). */
:where(h1, h2) {
  margin-block-start: calc(var(--marx-flow) * 1.5);
}

:where(h3, h4, h5, h6) {
  margin-block-start: var(--marx-flow);
}

/* Paragraphs. */
:where(p) {
  margin-block-start: var(--marx-flow);
  text-wrap: pretty;
}

/* Links — Marx-blue with a subtle underline that firms up on hover (a11y default). */
:where(a) {
  color: var(--marx-link);
  text-decoration-line: underline;
  text-decoration-color: color-mix(in oklab, currentColor 30%, transparent);
  text-underline-offset: 0.15em;
}

:where(a:hover) {
  color: var(--marx-link-hover);
  text-decoration-color: currentColor;
}

:where(a:focus-visible) {
  outline: 2px solid var(--marx-ring);
  outline-offset: 2px;
  border-radius: var(--marx-radius);
}

/* Inline semantics. */
:where(small) {
  color: var(--marx-muted);
}

:where(mark) {
  background-color: var(--marx-mark);
  color: inherit;
  padding-block: 0.05em;
  padding-inline: 0.15em;
  border-radius: var(--marx-radius);
}

:where(del, s) {
  color: var(--marx-muted);
  text-decoration-line: line-through;
}

:where(u, ins) {
  text-decoration-line: underline;
}

/* Preflight already sets `underline dotted`; add the help affordance + offset. */
:where(abbr[title]) {
  text-underline-offset: 0.2em;
  cursor: help;
}

/* Lists — preflight strips markers, so restore them (muted) and the rhythm. */
:where(ul) {
  list-style-type: disc;
}

:where(ul ul) {
  list-style-type: circle;
}

:where(ul ul ul) {
  list-style-type: square;
}

:where(ol) {
  list-style-type: decimal;
}

:where(ol[type="a" i]) {
  list-style-type: lower-alpha;
}

:where(ol[type="i" i]) {
  list-style-type: lower-roman;
}

:where(ol[type="A" s]) {
  list-style-type: upper-alpha;
}

:where(ol[type="I" s]) {
  list-style-type: upper-roman;
}

:where(ul, ol) {
  margin-block-start: var(--marx-flow);
  padding-inline-start: 1.5em;
}

:where(li) {
  margin-block-start: var(--marx-space-xs);
  padding-inline-start: 0.4em;
}

:where(li)::marker {
  color: var(--marx-muted);
}

/* Nested lists hug their parent item — the li above already owns the gap. */
:where(li > ul, li > ol) {
  margin-block-start: 0;
}

/* Navigation lists are for structure, not bullets. Lives after the marker
   rules above so it wins the same-specificity tie; the zero-width prefix keeps
   the list semantics VoiceOver would otherwise drop. */
:where(nav) :where(ol, ul) {
  list-style-type: none;
  padding: 0;
}

:where(nav li)::before {
  content: "\200B";
  float: inline-start;
}

/* Definition lists. */
:where(dl) {
  margin-block-start: var(--marx-flow);
}

:where(dt) {
  font-weight: bold;
  margin-block-start: var(--marx-space-md);
}

:where(dd) {
  color: var(--marx-muted);
  margin-block-start: var(--marx-space-2xs);
  margin-inline-start: var(--marx-space-md);
}

/* Blockquote — Marx identity: serif italic behind a hairline rule. */
:where(blockquote) {
  border-inline-start: 2px solid var(--marx-border);
  font-family: var(--marx-font-serif);
  font-style: italic;
  margin-block-start: var(--marx-flow);
  margin-inline: 0;
  padding-inline-start: var(--marx-space-md);
}

/* Inline code. */
:where(:not(pre) > code) {
  background-color: var(--marx-surface);
  font-size: 0.875em;
  border-radius: min(calc(var(--marx-radius) * 0.6), 0.35em);
  padding-block: 0.125em;
  padding-inline: 0.3em;
}

/* Shrink code set inside large headings so it sits on the text. */
:where(:is(h1, h2, h3, h4) code) {
  font-size: 0.9em;
}

/* Code blocks — scroll wide lines rather than wrap (old Marx wrapped). */
:where(pre) {
  background-color: var(--marx-surface);
  font-size: var(--marx-text-sm);
  line-height: 1.5;
  tab-size: 2;
  border-radius: var(--marx-radius);
  margin-block-start: var(--marx-flow);
  margin-block-end: var(--marx-space-md);
  padding-block: var(--marx-space-sm);
  padding-inline: var(--marx-space-md);
  overflow-x: auto;
}

:where(pre code) {
  background-color: transparent;
  font-size: inherit;
  border-radius: 0;
  padding: 0;
}

/* Keyboard keys — keycap in the body font (typeset treatment). */
:where(kbd) {
  font-family: inherit;
  font-size: 0.85em;
  border: 1px solid var(--marx-border);
  border-block-end-width: 2px;
  border-radius: min(calc(var(--marx-radius) * 0.6), 0.35em);
  padding-block: 0.0625em;
  padding-inline: 0.35em;
}

/* Figures — serif caption keeps Marx's editorial voice. */
:where(figure) {
  margin-block-start: var(--marx-flow);
  margin-inline: 0;
}

:where(figcaption) {
  color: var(--marx-muted);
  font-family: var(--marx-font-serif);
  font-size: var(--marx-text-sm);
  margin-block-start: var(--marx-space-xs);
}

/* Fragment targets clear the top of the viewport by one rhythm unit. */
:where([id]) {
  scroll-margin-block-start: var(--marx-flow);
}

/* Headings and title <header>s do not own space below. The next unit does.
   `h + *` covers a heading beside its content; `article > header + *` covers
   the HTML5 pattern where the title is wrapped and the content is a sibling
   of that header. Scoped so a page hero is not tightened. */
:where(:is(h1, h2, h3, h4, h5, h6) + *) {
  margin-block-start: var(--marx-space-md);
}

:where(:is(article, section) > header + *) {
  margin-block-start: var(--marx-space-md);
}