/* helia base theme.
 *
 * Every color is a custom property. Light values are the default, dark
 * values apply under `prefers-color-scheme: dark` (there is no toggle: the
 * site follows the system setting), and `data-theme="light"` or
 * `data-theme="dark"` on <html> pins one. A project overrides tokens in its
 * own stylesheet, listed after this one:
 *
 *   :root { --helia-accent: #7a3e9d; --helia-font-body: var(--helia-font-serif); }
 *
 * Layout: one centered column (`--helia-measure`) under an optional site top
 * bar; no sidebar. Class conventions are documented in
 * crates/helia-render/README.md.
 */

/* ------------------------------------------------------------------ tokens */

:root {
  color-scheme: light;
  --helia-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Roboto", "Helvetica Neue",
    Arial, sans-serif;
  --helia-font-serif: "Iowan Old Style", "Charter", "Bitstream Charter", "Source Serif 4", "Palatino Linotype",
    Palatino, Georgia, serif;
  --helia-font-body: var(--helia-font-sans);
  --helia-font-heading: var(--helia-font-body);
  --helia-font-mono: "JetBrains Mono", "SF Mono", "SFMono-Regular", ui-monospace, "Iosevka", "Fira Code", Menlo,
    Consolas, monospace;
  --helia-font-size: 17px;
  --helia-line-height: 1.65;
  /* Width of the text column (about 70 characters). */
  --helia-measure: 44rem;
  /* Horizontal page padding; the outline bullets hang into it. */
  --helia-page-pad: clamp(1.25rem, 5vw, 2.5rem);
  --helia-radius: 6px;
  --helia-radius-lg: 10px;
  --helia-gap: 1rem;

  --helia-bg: #fdfdfc;
  --helia-bg-subtle: #f5f5f3;
  --helia-fg: #1c1e21;
  --helia-muted: #585d68;
  --helia-faint: #8b909b;
  --helia-border: #e5e5e2;
  --helia-border-strong: #d2d3d0;
  --helia-link: #2455a4;
  --helia-link-decoration: rgba(36, 85, 164, 0.35);
  --helia-accent: #2455a4;
  --helia-hover: rgba(36, 85, 164, 0.04);
  --helia-hover-strong: rgba(36, 85, 164, 0.09);
  --helia-code-bg: #f4f4f2;
  --helia-code-border: #e8e8e5;
  --helia-quote-border: #cfd3da;
  --helia-mark: rgba(255, 226, 90, 0.45);
  --helia-error-bg: #c62828;
  --helia-error-fg: #ffffff;
  --helia-pending-bg: rgba(0, 90, 110, 0.05);
  --helia-pending-fg: #6b6b6b;
  --helia-number: #8b909b;
  --helia-shadow: 0 1px 2px rgba(20, 22, 26, 0.04), 0 2px 8px rgba(20, 22, 26, 0.04);

  /* org-bullets-style nesting indicators (headings, transclusions). The set
   * cycles by nesting depth (heading level, already shifted by transclusion
   * depth — see helia-render/README.md "Headings"); a project may override the
   * whole set or a single level in its own stylesheet. */
  --helia-bullets: "\25C9" "\25CB" "\2738" "\2739" "\25C6" "\25B8"; /* ◉ ○ ✸ ✹ ◆ ▸ */
  --helia-bullet-1: "\25C9";
  --helia-bullet-2: "\25CB";
  --helia-bullet-3: "\2738";
  --helia-bullet-4: "\2739";
  --helia-bullet-5: "\25C6";
  --helia-bullet-6: "\25B8";
  /* Width of the gutter column a bullet hangs in; one outline level. */
  --helia-bullet-indent: 1.1em;
  --helia-bullet-color: var(--helia-accent);
  --helia-bullet-folded-color: var(--helia-faint);
  --helia-bullet-guide-color: var(--helia-border);
  --helia-bullet-group-color: var(--helia-faint);

  --hl-comment: #6a737d;
  --hl-keyword: #a626a4;
  --hl-storage: #a626a4;
  --hl-string: #3c7d27;
  --hl-constant: #b35900;
  --hl-number: #b35900;
  --hl-function: #2957b8;
  --hl-type: #8a6100;
  --hl-variable: #1c1e21;
  --hl-parameter: #9a4b00;
  --hl-operator: #0e7490;
  --hl-punctuation: #555555;
  --hl-tag: #c2185b;
  --hl-attribute: #8a6100;
  --hl-support: #0e7490;
  --hl-invalid: #c62828;
  --hl-inserted: #3c7d27;
  --hl-deleted: #c62828;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --helia-bg: #121418;
    --helia-bg-subtle: #191c21;
    --helia-fg: #e3e5e9;
    --helia-muted: #a2a8b3;
    --helia-faint: #737a86;
    --helia-border: #272b32;
    --helia-border-strong: #353a43;
    --helia-link: #8fb8f2;
    --helia-link-decoration: rgba(143, 184, 242, 0.35);
    --helia-accent: #8fb8f2;
    --helia-hover: rgba(143, 184, 242, 0.05);
    --helia-hover-strong: rgba(143, 184, 242, 0.12);
    --helia-code-bg: #181b20;
    --helia-code-border: #262a31;
    --helia-quote-border: #3e434c;
    --helia-mark: rgba(200, 170, 40, 0.32);
    --helia-error-bg: #b3261e;
    --helia-error-fg: #ffffff;
    --helia-pending-bg: rgba(160, 220, 220, 0.07);
    --helia-pending-fg: #9a9a9a;
    --helia-number: #737a86;
    --helia-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 10px rgba(0, 0, 0, 0.2);

    --hl-comment: #7f8791;
    --hl-keyword: #d49ef0;
    --hl-storage: #d49ef0;
    --hl-string: #9bd080;
    --hl-constant: #f0a860;
    --hl-number: #f0a860;
    --hl-function: #82aaff;
    --hl-type: #e8c46a;
    --hl-variable: #e3e5e9;
    --hl-parameter: #f0b88a;
    --hl-operator: #6cd0e0;
    --hl-punctuation: #a7a7a7;
    --hl-tag: #f07aa8;
    --hl-attribute: #e8c46a;
    --hl-support: #6cd0e0;
    --hl-invalid: #ff6b6b;
    --hl-inserted: #9bd080;
    --hl-deleted: #ff6b6b;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --helia-bg: #121418;
  --helia-bg-subtle: #191c21;
  --helia-fg: #e3e5e9;
  --helia-muted: #a2a8b3;
  --helia-faint: #737a86;
  --helia-border: #272b32;
  --helia-border-strong: #353a43;
  --helia-link: #8fb8f2;
  --helia-link-decoration: rgba(143, 184, 242, 0.35);
  --helia-accent: #8fb8f2;
  --helia-hover: rgba(143, 184, 242, 0.05);
  --helia-hover-strong: rgba(143, 184, 242, 0.12);
  --helia-code-bg: #181b20;
  --helia-code-border: #262a31;
  --helia-quote-border: #3e434c;
  --helia-mark: rgba(200, 170, 40, 0.32);
  --helia-error-bg: #b3261e;
  --helia-error-fg: #ffffff;
  --helia-pending-bg: rgba(160, 220, 220, 0.07);
  --helia-pending-fg: #9a9a9a;
  --helia-number: #737a86;
  --helia-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 10px rgba(0, 0, 0, 0.2);

  --hl-comment: #7f8791;
  --hl-keyword: #d49ef0;
  --hl-storage: #d49ef0;
  --hl-string: #9bd080;
  --hl-constant: #f0a860;
  --hl-number: #f0a860;
  --hl-function: #82aaff;
  --hl-type: #e8c46a;
  --hl-variable: #e3e5e9;
  --hl-parameter: #f0b88a;
  --hl-operator: #6cd0e0;
  --hl-punctuation: #a7a7a7;
  --hl-tag: #f07aa8;
  --hl-attribute: #e8c46a;
  --hl-support: #6cd0e0;
  --hl-invalid: #ff6b6b;
  --hl-inserted: #9bd080;
  --hl-deleted: #ff6b6b;
}

/* ------------------------------------------------------------------ base */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--helia-bg);
  color: var(--helia-fg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 1.25rem;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  padding: 2.5rem var(--helia-page-pad) 5rem;
  font-family: var(--helia-font-body);
  font-size: var(--helia-font-size);
  line-height: var(--helia-line-height);
  background: var(--helia-bg);
  color: var(--helia-fg);
  hyphens: auto;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga";
}

@media (max-width: 700px) {
  :root {
    --helia-font-size: 16px;
    --helia-line-height: 1.6;
  }
  body {
    padding-top: 1.5rem;
    padding-bottom: 3.5rem;
  }
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--helia-font-heading);
  line-height: 1.25;
  margin: 1.6em 0 0.5em;
  font-weight: 650;
  letter-spacing: -0.011em;
  text-wrap: balance;
}

/* In em, relative to the body size (--helia-font-size), which themes change. */
h1 {
  font-size: 1.9em;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 1.35em;
}
h3 {
  font-size: 1.1em;
}
h4,
h5,
h6 {
  font-size: 1em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--helia-link);
  text-decoration: none;
}

a:hover {
  text-decoration-color: currentColor;
}

a:focus-visible,
summary:focus-visible,
button:focus-visible {
  outline: 2px solid var(--helia-accent);
  outline-offset: 2px;
  border-radius: 3px;
}

img {
  max-width: 100%;
  height: auto;
}

hr {
  border: 0;
  height: 1px;
  background: var(--helia-border);
  margin: 2em 0;
}

ul,
ol {
  padding-left: 1.5em;
  margin: 0 0 1em;
}

li {
  margin: 0.2em 0;
}

li::marker {
  color: var(--helia-faint);
}

ol ol {
  list-style-type: lower-alpha;
}

ol ol ol {
  list-style-type: lower-roman;
}

li > p:last-child {
  margin-bottom: 0.25em;
}

mark {
  background: var(--helia-mark);
  color: inherit;
  border-radius: 2px;
  padding: 0 0.1em;
}

blockquote {
  margin: 0 0 1em;
  padding: 0.1em 0 0.1em 1.1em;
  border-inline-start: 3px solid var(--helia-quote-border);
  color: var(--helia-muted);
}

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

code {
  font-size: 0.86em;
  background: var(--helia-code-bg);
  border: 1px solid var(--helia-code-border);
  border-radius: 4px;
  padding: 0.05em 0.3em;
}

kbd {
  font-size: 0.82em;
  border: 1px solid var(--helia-border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 0.35em;
  background: var(--helia-bg-subtle);
}

pre {
  font-size: 0.84em;
  line-height: 1.55;
  background: var(--helia-code-bg);
  border: 1px solid var(--helia-code-border);
  border-radius: var(--helia-radius);
  padding: 0.85em 1em;
  margin: 0 0 1.1em;
  overflow-x: auto;
  tab-size: 2;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

table {
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

th {
  text-align: left;
  font-weight: 600;
}

th,
td {
  padding: 0.35em 0.9em 0.35em 0;
  vertical-align: top;
  border-bottom: 1px solid var(--helia-border);
}

thead th {
  border-bottom: 1px solid var(--helia-border-strong);
}

figure {
  margin: 1.5em 0;
  text-align: center;
}

figcaption {
  color: var(--helia-muted);
  font-size: 0.92em;
  padding: 0.5em 0 0;
}

/* "Figure 1" before a caption (typst's figure numbering). */
.helia-figure-number {
  font-style: normal;
  font-weight: 600;
}

details > summary {
  list-style: none;
  cursor: pointer;
}

details > summary::-webkit-details-marker {
  display: none;
}

::selection {
  background: var(--helia-hover-strong);
}

/* ------------------------------------------------------------------ top bar
 *
 * `[project] home` and `[theme] nav`: the site's name (a link to the home
 * page) and a few links, above every page; the search button joins it at
 * the end. Full-bleed, its content aligned with the text column. */

.helia-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
  margin: -2.5rem calc(-1 * var(--helia-page-pad)) 3rem;
  /* 100% is the body's content width: the column's edges line up. */
  padding: 0.9rem max(var(--helia-page-pad), calc((100% + 2 * var(--helia-page-pad) - var(--helia-measure)) / 2));
  border-bottom: 1px solid var(--helia-border);
  font-size: 0.94em;
  line-height: 1.4;
}

.helia-home {
  color: var(--helia-fg);
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  margin-right: auto;
}

.helia-home:hover {
  color: var(--helia-accent);
}

.helia-home[aria-current="page"] {
  color: var(--helia-fg);
}

.helia-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.helia-nav-links li {
  margin: 0;
}

.helia-nav-links a {
  color: var(--helia-muted);
  text-decoration: none;
}

.helia-nav-links a:hover,
.helia-nav-links a[aria-current="page"] {
  color: var(--helia-fg);
}

.helia-nav-links a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--helia-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.45em;
}

.helia-topbar .helia-search-button {
  float: none;
  margin: 0;
}

@media (max-width: 700px) {
  .helia-topbar {
    margin-top: -1.5rem;
    margin-bottom: 2rem;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }
}

/* ------------------------------------------------------------------ page layout (used by base layouts) */

/* One centered column. `.helia-rail` (an aside column) is no longer part of
 * the base layout; a project layout that still prints one gets it stacked
 * after the article. */
.helia-page {
  max-width: var(--helia-measure);
  margin: 0 auto;
}

.helia-page > .helia-main,
.helia-page > main,
.helia-page > article {
  min-width: 0;
}

.helia-rail {
  margin-top: 2em;
  border-top: 1px solid var(--helia-border);
  padding-top: 1em;
  font-size: 0.92em;
  color: var(--helia-muted);
}

.helia-main,
main,
article {
  max-width: var(--helia-measure);
}

/* ------------------------------------------------------------------ header, metadata, navigation */

.helia-header {
  margin-bottom: 2rem;
}

.helia-header > h1,
.helia-header > h2 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.022em;
  font-weight: 700;
  margin: 0 0 0.4em;
}

@media (max-width: 700px) {
  .helia-header > h1,
  .helia-header > h2 {
    font-size: 1.65rem;
  }
}

.helia-site {
  font-weight: 800;
  font-size: 1.3em;
  color: var(--helia-faint);
}

.helia-site a {
  color: inherit;
}

/* The kind label above the title: a small eyebrow. */
.helia-taxon {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--helia-accent);
  padding-bottom: 0.45em;
}

.helia-meta {
  color: var(--helia-muted);
  font-size: 0.92em;
  line-height: 1.6;
  margin: 0.25em 0 0;
}

.helia-meta a {
  color: inherit;
}

.helia-meta ul {
  display: inline;
  padding: 0;
  margin: 0;
}

.helia-meta li {
  display: inline;
}

.helia-meta li::after,
.helia-meta > .helia-meta-item:not(:last-child)::after {
  content: " \00b7 ";
  color: var(--helia-faint);
}

.helia-meta li:last-child::after {
  content: "";
}

.helia-slug,
.helia-id,
.helia-doi,
.helia-orcid {
  color: var(--helia-faint);
  font-weight: 400;
  font-size: 0.8em;
}

/* The entry's ID after a transcluded title, as Forester prints it: "[id]",
 * always shown, and a link to the entry's own page. */
.helia-slug {
  font-family: var(--helia-font-mono);
  font-size: 0.68em;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--helia-accent);
  text-decoration: none;
  /* one unit that moves to the next line whole, and wraps inside only when
     wider than the column (a long citation key on a phone) */
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.helia-slug::before {
  content: "[";
}

.helia-slug::after {
  content: "]";
}

.helia-slug:hover,
.helia-slug:focus-visible {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.helia-tags {
  display: inline;
}

.helia-tag {
  display: inline-block;
  font-family: var(--helia-font-mono);
  font-size: 0.75em;
  line-height: 1.5;
  padding: 0 0.55em;
  margin: 0 0.1em;
  background: var(--helia-bg-subtle);
  border: 1px solid var(--helia-border);
  border-radius: 999px;
  color: var(--helia-muted);
}

.helia-tag a {
  color: inherit;
  text-decoration: none;
}

.helia-tag:has(a):hover {
  color: var(--helia-accent, inherit);
  border-color: currentColor;
}

.helia-nav,
nav.helia-nav {
  margin-bottom: 1em;
}

.helia-context h2,
.helia-backlinks h2,
.helia-related h2,
.helia-references h2 {
  font-size: 1.05em;
  margin-top: 0.4em;
}

/* The table of contents: a compact, folded "Contents" disclosure at the top
 * of the article (not part of the outline, so no org bullet), whose items
 * link to headings and transclusions on the page. */
.helia-toc {
  margin: 0 0 2rem;
  font-size: 0.92em;
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius-lg);
  background: var(--helia-bg-subtle);
}

.helia-toc.helia-collapsible > details > .helia-group-summary {
  margin: 0;
  padding: 0.55em 1em;
  color: var(--helia-muted);
}

.helia-toc.helia-collapsible > details > .helia-group-summary::before {
  content: "\25B8";
  width: auto;
  margin: 0 0.5em 0 0;
  color: var(--helia-faint);
  transition: transform 0.12s ease;
}

.helia-toc.helia-collapsible > details[open] > .helia-group-summary::before {
  transform: rotate(90deg);
}

.helia-toc.helia-collapsible > details:not([open]) > .helia-group-summary::after {
  content: none;
}

.helia-toc .helia-group-summary > h2,
.helia-toc .helia-group-summary > h3 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.helia-toc.helia-collapsible > details > .helia-group-body {
  border: 0;
  margin: 0;
  padding: 0 1em 0.7em 2.05em;
}

.helia-toc ul,
.helia-toc ol {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.helia-toc li {
  margin: 0.15em 0;
}

.helia-toc li > p {
  margin: 0;
}

.helia-toc li > ul,
.helia-toc li > ol {
  padding-left: 1.1em;
}

.helia-toc a {
  color: var(--helia-fg);
  text-decoration: none;
}

.helia-toc a:hover {
  color: var(--helia-accent);
}

.helia-toc .helia-number {
  margin-right: 0.35em;
}

.helia-backlinks,
.helia-related,
.helia-references,
.helia-context {
  margin-top: 2em;
}

.helia-footer,
footer.helia-footer {
  margin-top: 3.5rem;
  border-top: 1px solid var(--helia-border);
  padding-top: 1.25rem;
  color: var(--helia-muted);
  font-size: 0.94em;
}

.helia-footer > section,
.helia-footer > .helia-section {
  margin-bottom: 1em;
}

.helia-footer a {
  color: var(--helia-fg);
}

/* The entry's identity (ID, kind, source path), quietly at the very end. */
.helia-identity {
  margin-top: 2.5rem;
  font-family: var(--helia-font-mono);
  font-size: 0.72em;
  color: var(--helia-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.2em 1em;
}

.helia-identity .helia-id {
  font-size: inherit;
}

/* ------------------------------------------------------------------ links */

a.helia-link,
a.helia-entry-link,
a.helia-label-ref,
.helia-cite a {
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--helia-link-decoration);
  text-underline-offset: 0.18em;
  transition: text-decoration-color 0.12s ease;
}

/* Links to other entries: dotted, the internal-link convention. */
a.helia-entry-link,
a.helia-label-ref,
.helia-cite a {
  text-decoration-style: dotted;
}

a.helia-link:hover,
a.helia-entry-link:hover,
a.helia-label-ref:hover,
.helia-cite a:hover {
  text-decoration-color: currentColor;
  text-decoration-style: solid;
}

a.helia-external::after {
  content: "\2197";
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
  color: var(--helia-faint);
  margin-left: 0.08em;
}

code.helia-raw-inline {
  white-space: break-spaces;
}

.helia-unavailable {
  color: var(--helia-muted);
}

.helia-unsafe {
  color: var(--helia-muted);
  text-decoration: line-through;
}

.helia-cite {
  font-style: normal;
}

.helia-number {
  color: var(--helia-number);
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

/* ------------------------------------------------------------------ transclusions */

.helia-transclusion {
  border-radius: var(--helia-radius);
  padding: 0.1em 0.6em 0.1em 0.4em;
  margin: 0 -0.6em 0.5em -0.4em;
  transition: background-color 0.15s ease;
}

.helia-transclusion:hover {
  background-color: var(--helia-hover);
}

.helia-transclusion > details[open] {
  margin-bottom: 0.6em;
}

.helia-transclusion-summary {
  display: block;
  padding: 0.1em 0;
}

.helia-transclusion-summary > .helia-transclusion-title {
  display: inline;
  margin: 0;
}

.helia-transclusion-summary::before {
  content: var(--helia-bullet-6);
  display: inline-block;
  width: var(--helia-bullet-indent);
  margin-left: calc(-1 * var(--helia-bullet-indent));
  color: var(--helia-bullet-color);
  font-size: 0.95em;
  text-align: center;
}

/* Nesting bullets cycle by transclusion depth (see theme.css tokens above),
 * continuing the sequence a heading inside the transclusion started at. Depth
 * 1-6 map directly; deeper nesting repeats the cycle. */
.helia-transclusion[data-depth="1"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-1);
}
.helia-transclusion[data-depth="2"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-2);
}
.helia-transclusion[data-depth="3"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-3);
}
.helia-transclusion[data-depth="4"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-4);
}
.helia-transclusion[data-depth="5"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-5);
}
.helia-transclusion[data-depth="6"] > details > .helia-transclusion-summary::before,
.helia-transclusion[data-depth="12"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-6);
}
.helia-transclusion[data-depth="7"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-1);
}
.helia-transclusion[data-depth="8"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-2);
}
.helia-transclusion[data-depth="9"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-3);
}
.helia-transclusion[data-depth="10"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-4);
}
.helia-transclusion[data-depth="11"] > details > .helia-transclusion-summary::before {
  content: var(--helia-bullet-5);
}

.helia-transclusion > details:not([open]) > .helia-transclusion-summary::before {
  color: var(--helia-bullet-folded-color);
}


.helia-transclusion-summary:hover::before {
  color: var(--helia-accent);
}

/* Relative to the surrounding text (em, not rem): a theme that sets a larger
 * body size must not get titles smaller than the body they fold. */
.helia-transclusion-title {
  font-size: 1.1em;
  font-weight: 600;
}

.helia-transclusion[data-depth="1"] > details > summary > .helia-transclusion-title {
  font-size: 1.3em;
}

.helia-transclusion-summary .helia-number {
  margin-right: 0.15em;
}

.helia-transclusion-title .helia-title {
  font-weight: inherit;
}

/* Related: the tags an entry shares with this one, quietly after its title. */
.helia-related-tags {
  font-family: var(--helia-font-mono);
  hyphens: none;
  -webkit-hyphens: none;
  margin-left: 0.5em;
  font-size: 0.78em;
  color: var(--helia-faint);
  white-space: normal;
}

.helia-related-tags a {
  color: inherit;
  text-decoration: none;
}

/* not the "[id]" the footer lists put after their links */
.helia-related .helia-related-tags a.helia-entry-link[data-entry]::after {
  content: none;
}

.helia-related-tags a:hover,
.helia-related-tags a:focus-visible {
  text-decoration: underline;
}

/* Footer lists (backlinks, related): each entry's ID after its title, "[id]". */
.helia-context a.helia-entry-link[data-entry]::after,
.helia-backlinks a.helia-entry-link[data-entry]::after,
.helia-related a.helia-entry-link[data-entry]::after {
  /* one unit that moves to the next line whole, and wraps inside only when
     wider than the column (a long ID on a phone) */
  content: "[" attr(data-entry) "]";
  display: inline-block;
  max-width: 100%;
  margin-left: 0.3em;
  overflow-wrap: anywhere;
  hyphens: none;
  font-family: var(--helia-font-mono, monospace);
  font-size: 0.8em;
  color: var(--helia-faint);
}

/* The kind's byline (venue, date, ...): a quiet line under the title and the
 * entry's ID (the renderer prints it after the slug), starting a new line. */
.helia-transclusion-title .helia-byline {
  font-size: 0.8em;
  font-weight: 400;
  line-height: 1.6;
  color: var(--helia-muted);
}

.helia-transclusion-title .helia-byline::before {
  content: "\A";
  white-space: pre;
}

.helia-transclusion .helia-slug {
  margin-left: 0.4em;
}

.helia-transclusion-body {
  padding-top: 0.35em;
}

.helia-transclude {
  color: var(--helia-muted);
}

.helia-env > :last-child {
  margin-bottom: 0.4em;
}

.helia-env-label {
  font-weight: 700;
  font-style: normal;
}

/* ------------------------------------------------------------------ collapsible sections, groups, code
 *
 * Headings with their bodies (`.helia-heading-section`), layout groups with a
 * `collapsible` attribute (`.helia-collapsible`) and code blocks (`.helia-code`)
 * are native <details>. Headings and transclusions get an org-bullets-style
 * glyph, cycling by nesting depth (`data-level`, already shifted by
 * transclusion depth); groups and code keep a small, subdued triangle. Both
 * are the collapse toggle (they're inside <summary>, which is natively
 * clickable) and sit in the left gutter via a negative margin, aligned with
 * the heading's first line. */

.helia-heading-section > details > .helia-heading-summary,
.helia-collapsible > details > .helia-group-summary {
  display: block;
  position: relative;
  margin: 0.9em 0 0.35em;
}

.helia-heading-summary > h2,
.helia-heading-summary > h3,
.helia-heading-summary > h4,
.helia-heading-summary > h5,
.helia-heading-summary > h6,
.helia-group-summary > h2,
.helia-group-summary > h3,
.helia-group-summary > h4,
.helia-group-summary > h5,
.helia-group-summary > h6 {
  display: inline;
  margin: 0;
}

.helia-heading-summary::before {
  content: var(--helia-bullet-6);
  display: inline-block;
  width: var(--helia-bullet-indent);
  margin-left: calc(-1 * var(--helia-bullet-indent));
  color: var(--helia-bullet-color);
  font-size: 0.9em;
  font-weight: 400;
  text-align: center;
}

.helia-heading-section[data-level="1"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-1);
}
.helia-heading-section[data-level="2"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-2);
}
.helia-heading-section[data-level="3"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-3);
}
.helia-heading-section[data-level="4"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-4);
}
.helia-heading-section[data-level="5"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-5);
}
.helia-heading-section[data-level="6"] > details > .helia-heading-summary::before,
.helia-heading-section[data-level="12"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-6);
}
.helia-heading-section[data-level="7"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-1);
}
.helia-heading-section[data-level="8"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-2);
}
.helia-heading-section[data-level="9"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-3);
}
.helia-heading-section[data-level="10"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-4);
}
.helia-heading-section[data-level="11"] > details > .helia-heading-summary::before {
  content: var(--helia-bullet-5);
}

/* Collapsible groups (backlinks, related, query results, ...) are part of
 * the outline too: an org bullet, faint when folded, like headings. Footer sections are top level (bullet 1), groups in the body
 * sit one level in (bullet 2). Code keeps a small triangle, rotated when open. */
.helia-collapsible > details > .helia-group-summary::before {
  content: var(--helia-bullet-2);
  display: inline-block;
  width: var(--helia-bullet-indent);
  margin-left: calc(-1 * var(--helia-bullet-indent));
  color: var(--helia-bullet-color);
  font-size: 0.9em;
  font-weight: 400;
  text-align: center;
}

.helia-footer .helia-collapsible > details > .helia-group-summary::before {
  content: var(--helia-bullet-1);
}

.helia-collapsible > details:not([open]) > .helia-group-summary::before {
  color: var(--helia-bullet-folded-color);
}


/* Footer lists (backlinks, related) continue the outline one level down:
 * the group body is indented one bullet column (see the indent guides
 * below), so an item's bullet hangs under the section title's first letter
 * and its text starts one column further in. */
.helia-footer .helia-collapsible .helia-group-body > ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0.25em;
}

.helia-footer .helia-collapsible .helia-group-body > ul > li::before {
  content: var(--helia-bullet-2);
  display: inline-block;
  width: var(--helia-bullet-indent);
  margin-left: calc(-1 * var(--helia-bullet-indent));
  color: var(--helia-bullet-color);
  font-size: 0.85em;
  text-align: center;
}

.helia-code-summary::before {
  content: "\25B8";
  display: inline-block;
  width: 1em;
  margin-left: -1em;
  color: var(--helia-bullet-group-color);
  font-size: 0.85em;
  font-weight: 400;
  transition: transform 0.12s ease;
}

.helia-code[open] > .helia-code-summary::before {
  transform: rotate(90deg);
}

.helia-heading-section > details:not([open]) > .helia-heading-summary::before {
  color: var(--helia-bullet-folded-color);
}


.helia-heading-summary:hover::before,
.helia-group-summary:hover::before,
.helia-code-summary:hover::before {
  color: var(--helia-accent);
}

.helia-heading-section > details:not([open]) > .helia-heading-summary {
  margin-bottom: 0.6em;
}

/* Indent guides: a subtle vertical line down a section's/transclusion's
 * body, connecting the bullet to its extent. Nesting compounds naturally
 * since a subsection's own body is inside its parent's. */
.helia-heading-section > details > .helia-heading-body,
.helia-transclusion > details > .helia-transclusion-body,
.helia-collapsible > details > .helia-group-body {
  min-width: 0;
  border-inline-start: 1px solid var(--helia-bullet-guide-color);
  margin-inline-start: calc(-0.5 * var(--helia-bullet-indent));
  padding-inline-start: calc(1.5 * var(--helia-bullet-indent) - 1px);
}

.helia-group-body {
  min-width: 0;
}

@media (max-width: 480px) {
  :root {
    --helia-bullet-indent: 0.95em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .helia-group-summary::before,
  .helia-code-summary::before {
    transition: none;
  }
}

.helia-group-title {
  font-weight: 600;
  font-size: 1em;
}

.helia-code {
  margin: 0 0 0.9em;
}

.helia-code > pre.helia-raw {
  margin: 0;
  border-top-left-radius: 0;
}

.helia-code-summary {
  display: inline-block;
  position: relative;
  padding: 0.05em 0.7em 0.05em 1.3em;
  font-family: var(--helia-font-mono);
  font-size: 0.72em;
  color: var(--helia-faint);
  background: var(--helia-code-bg);
  border-radius: var(--helia-radius) var(--helia-radius) 0 0;
  user-select: none;
}

.helia-code-summary::before {
  margin-left: -1.1em;
  width: 1.1em;
}

.helia-code:not([open]) > .helia-code-summary {
  border-radius: var(--helia-radius);
}

.helia-code-lang {
  color: var(--helia-muted);
  font-weight: 500;
}

.helia-code-lines {
  font-variant-numeric: tabular-nums;
}

/* Page furniture that uses `collapsible` groups in the base layouts. */

/* Definitions sit last in the footer, folded; each one is an outline item
 * under the section's bullet, like the backlinks and related lists. */
.helia-definitions h2 {
  font-size: 1.05em;
  margin-top: 0.4em;
}

.helia-def {
  margin: 0.2em 0 0.8em;
}

.helia-def-head::before {
  content: var(--helia-bullet-2);
  display: inline-block;
  width: var(--helia-bullet-indent);
  margin-left: calc(-1 * var(--helia-bullet-indent));
  margin-right: -0.6em;
  color: var(--helia-bullet-color);
  font-size: 0.85em;
  text-align: center;
}

.helia-def-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2em 0.6em;
  margin-bottom: 0.25em;
}

.helia-def-name {
  font-family: var(--helia-font-mono);
  font-weight: 600;
  font-size: 0.92em;
}

.helia-def-kind {
  font-size: 0.72em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--helia-muted);
  border: 1px solid var(--helia-border);
  border-radius: 1em;
  padding: 0 0.55em;
}

.helia-def-signature {
  font-family: var(--helia-font-mono);
  font-size: 0.82em;
  color: var(--helia-faint);
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------------ elements */

.helia-figure > .helia-image,
.helia-figure > p {
  margin-bottom: 0.2em;
}

.helia-quote blockquote {
  margin-bottom: 0.2em;
}

.helia-attribution {
  text-align: right;
  font-style: normal;
}

.helia-terms dt {
  font-weight: 700;
}

.helia-terms dd {
  margin: 0 0 0.5em 1.5em;
}

.helia-table {
  overflow-x: auto;
  margin-bottom: 1em;
}

.helia-image {
  margin: 0 0 1em;
}

img.helia-image {
  margin: 0;
  vertical-align: middle;
}

.helia-pdf object {
  width: 100%;
  min-height: 70vh;
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius);
}

.helia-raw {
  position: relative;
}

.helia-footnote-ref {
  font-size: 0.75em;
  line-height: 0;
}

.helia-footnote-ref a {
  padding: 0 0.1em;
}

.helia-footnotes {
  margin-top: 2em;
  padding-top: 0.6em;
  border-top: 1px solid var(--helia-border);
  font-size: 0.92em;
}

.helia-footnote {
  display: flex;
  gap: 0.5em;
  margin-bottom: 0.4em;
}

.helia-footnote:target {
  background: var(--helia-mark);
  border-radius: var(--helia-radius);
}

.helia-footnote-back {
  color: var(--helia-muted);
  min-width: 1.5em;
  text-align: right;
}

.helia-footnote-body > p:last-child {
  margin-bottom: 0;
}

.helia-footnote-inline {
  font-size: 0.85em;
  color: var(--helia-muted);
}

.helia-footnote-inline::before {
  content: "(";
}

.helia-footnote-inline::after {
  content: ")";
}

/* The target of an in-page link (the table of contents, a label
 * reference): a brief highlight. */
.helia-heading:target,
.helia-transclusion:target,
.helia-transclusion-title:target {
  background: var(--helia-mark);
  border-radius: var(--helia-radius);
  box-shadow: 0 0 0 0.15em var(--helia-mark);
}

.helia-heading,
.helia-transclusion,
.helia-transclusion-title {
  scroll-margin-top: 1.25rem;
}

/* ------------------------------------------------------------------ math */

.helia-math-inline {
  display: inline;
}

.helia-math-inline > svg {
  display: inline-block;
  vertical-align: -0.25em;
  overflow: visible;
}

.helia-math-display {
  display: block;
  margin: 0.6em 0 0.9em;
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
}

.helia-math-display > svg {
  display: inline-block;
  max-width: 100%;
}

/* typst renders glyphs in black; follow the text color instead. */
.helia-math svg [fill="#000000"],
.helia-math svg [fill="#000"] {
  fill: currentColor;
}

.helia-math svg [stroke="#000000"],
.helia-math svg [stroke="#000"] {
  stroke: currentColor;
}

/* MathML math (`[math] html = "mathml"`, the default). Formulas render in
   New Computer Modern Math, the font typst uses for SVG and PDF output; the
   build writes it next to this file. They inherit the text colour, so they
   follow the light and dark themes. */
@font-face {
  font-family: "Helia Math";
  src: local("New Computer Modern Math"), local("NewComputerModernMath-Regular"),
    url("NewCMMath-Regular.otf") format("opentype");
  font-display: swap;
}

.helia-mathml math {
  font-family: "Helia Math", "New Computer Modern Math", "Latin Modern Math", "STIX Two Math", "Cambria Math", math;
}

.helia-math-display.helia-mathml math {
  display: block math;
}

/* BEGIN typst equation CSS: typst's HTML export (typst-html 0.15.1,
   Apache-2.0, https://github.com/typst/typst) adds these rules to documents
   with math. Kept verbatim; a test compares them with the embedded typst. */
/* Alignment */
mtable.right-align mtd,
mtable mtd.right-align,
mtable.left-align mtd.right-align,
mtable.aligned mtd:nth-child(odd) {
  justify-items: end;
  text-align: right;
}
mtable.cases mtd,
mtable.left-align mtd,
mtable mtd.left-align,
mtable.aligned mtd:nth-child(even),
math:is(:not([display])) > mtable.multiline-equation mtd {
  justify-items: start;
  text-align: left;
}
mtable.cases mtd,
mtable.aligned mtd,
mtable mtd.flushed,
mtable mtd.left-flush {
  padding-left: 0;
}
mtable.cases mtd,
mtable.aligned mtd,
mtable mtd.flushed,
mtable mtd.right-flush {
  padding-right: 0;
}

/* Tables */
mtable {
  math-style: inherit;
}
mtd {
  math-depth: auto-add;
  math-style: compact;
  math-shift: compact;
}

/* Equations */
mtable.multiline-equation mtd {
  math-depth: inherit;
  math-style: inherit;
  math-shift: inherit;
  padding: 0;
}
math > mtable.multiline-equation mtr:not(:last-child) mtd {
  padding-bottom: 0.5em;
}

/* Fractions */
mfrac {
  padding-inline: 0;
  margin-inline: 0.1em;
}

/* Accents */
mover[accent="true" i] > :first-child {
  font-feature-settings: "dtls";
}
mover.dotted[accent="true" i] > :first-child {
  font-feature-settings: "dtls" 0;
}

/* Other rules for scriptlevel, displaystyle and math-shift */
munder > :nth-child(2),
munderover > :nth-child(2) {
  math-shift: compact
}
munder[accentunder="true" i] > :not(:first-child),
mover[accent="true" i] > :not(:first-child) {
  math-depth: inherit;
  math-style: inherit;
  math-shift: inherit;
}
/* END typst equation CSS */

/* ------------------------------------------------------------------ islands, widgets, placeholders */

.helia-island {
  max-width: 100%;
}

div.helia-island {
  margin: 0 0 1em;
  overflow-x: auto;
}

div.helia-island.helia-svg,
div.helia-island.helia-png {
  text-align: center;
}

.helia-island svg {
  max-width: 100%;
  height: auto;
}

span.helia-island > svg {
  vertical-align: middle;
}

/* Typst islands (.helia-typst-svg) draw in currentColor and follow the theme;
   other SVG/PNG islands are typically black on white and get inverted. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .helia-island.helia-svg:not(.helia-no-invert) svg:not(.helia-typst-svg),
  :root:not([data-theme="light"]) .helia-island.helia-png:not(.helia-no-invert) img {
    filter: invert(0.88) hue-rotate(180deg);
  }
}

:root[data-theme="dark"] .helia-island.helia-svg:not(.helia-no-invert) svg:not(.helia-typst-svg),
:root[data-theme="dark"] .helia-island.helia-png:not(.helia-no-invert) img {
  filter: invert(0.88) hue-rotate(180deg);
}

.helia-island.helia-text,
.helia-island.helia-json {
  white-space: pre-wrap;
}

span.helia-island.helia-text,
span.helia-island.helia-json {
  font-family: var(--helia-font-mono);
  font-size: 0.88em;
}

.helia-island.helia-html,
.helia-island.helia-asset {
  text-align: left;
}

.helia-widget {
  display: block;
}

span.helia-widget {
  display: inline;
}

.helia-pending {
  background: var(--helia-pending-bg);
  color: var(--helia-pending-fg);
  border-radius: var(--helia-radius);
  border: 1px dashed var(--helia-border);
  padding: 0.1em 0.35em;
}

div.helia-pending {
  padding: 0.6em 0.8em;
  font-style: italic;
}

.helia-math.helia-pending code,
.helia-math.helia-error code {
  background: none;
  padding: 0;
}

.helia-error {
  background: var(--helia-error-bg);
  color: var(--helia-error-fg);
  border-radius: 4px;
  padding: 0.05em 0.35em 0.1em;
  font-weight: 600;
}

div.helia-error {
  padding: 0.4em 0.7em;
  margin: 0 0 1em;
}

.helia-error-code {
  font-family: var(--helia-font-mono);
  font-size: 0.85em;
  opacity: 0.9;
}

.helia-error a {
  color: inherit;
}

/* ------------------------------------------------------------------ syntax highlighting (helia-highlight: class="hl-<scope atom>") */

.hl-comment {
  color: var(--hl-comment);
  font-style: italic;
}

.hl-keyword {
  color: var(--hl-keyword);
}

.hl-storage {
  color: var(--hl-storage);
}

.hl-string,
.hl-char {
  color: var(--hl-string);
}

.hl-string.hl-regexp,
.hl-escape {
  color: var(--hl-operator);
}

.hl-constant {
  color: var(--hl-constant);
}

.hl-numeric,
.hl-number {
  color: var(--hl-number);
}

.hl-function,
.hl-entity.hl-name.hl-function {
  color: var(--hl-function);
}

.hl-type,
.hl-class,
.hl-struct,
.hl-enum,
.hl-interface,
.hl-trait,
.hl-storage.hl-type,
.hl-entity.hl-name.hl-type {
  color: var(--hl-type);
}

.hl-variable {
  color: var(--hl-variable);
}

.hl-parameter {
  color: var(--hl-parameter);
}

.hl-operator,
.hl-keyword.hl-operator {
  color: var(--hl-operator);
}

.hl-punctuation {
  color: var(--hl-punctuation);
}

.hl-tag,
.hl-entity.hl-name.hl-tag {
  color: var(--hl-tag);
}

.hl-attribute-name,
.hl-attribute {
  color: var(--hl-attribute);
}

.hl-support {
  color: var(--hl-support);
}

.hl-module,
.hl-namespace {
  color: var(--hl-type);
}

.hl-constructor {
  color: var(--hl-constant);
}

.hl-postulate,
.hl-primitive {
  color: var(--hl-keyword);
}

.hl-invalid {
  color: var(--hl-invalid);
  text-decoration: wavy underline;
}

.hl-markup.hl-heading {
  font-weight: 700;
  color: var(--hl-function);
}

.hl-markup.hl-bold {
  font-weight: 700;
}

.hl-markup.hl-italic {
  font-style: italic;
}

.hl-markup.hl-inserted {
  color: var(--hl-inserted);
}

.hl-markup.hl-deleted {
  color: var(--hl-deleted);
}

.hl-markup.hl-underline.hl-link {
  text-decoration: underline;
}

/* ------------------------------------------------------------------ print */

@media print {
  .helia-rail,
  .helia-topbar {
    display: none;
  }
  .helia-page {
    display: block;
  }
  .helia-transclusion:hover {
    background: none;
  }
  .helia-transclusion-summary::before,
  .helia-heading-summary::before,
  .helia-group-summary::before,
  .helia-code-summary::before,
  .helia-transclusion-summary::after,
  .helia-heading-summary::after,
  .helia-group-summary::after {
    content: none;
  }
  .helia-heading-section > details > .helia-heading-body,
  .helia-transclusion > details > .helia-transclusion-body,
  .helia-collapsible > details > .helia-group-body {
    border-inline-start: none;
    margin-inline-start: 0;
    padding-inline-start: 0;
  }
}

/* ------------------------------------------------------------------ literate chunks and runners */
/* @base/literate (`helia-chunk*`) and the helia-runner widget (`helia-runner*`). */

.helia-chunk {
  margin: 0 0 0.9em;
  scroll-margin-top: 1em;
}
.helia-chunk:target > .helia-chunk-header {
  background: var(--helia-mark);
}
.helia-chunk-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2em 0.75em;
  font-size: 0.82em;
  color: var(--helia-muted);
  padding: 0.15em 0.4em;
  border-bottom: 1px solid var(--helia-border);
}
.helia-chunk-header a {
  color: inherit;
}
.helia-chunk-name,
.helia-chunk-file,
.helia-chunk-lang {
  font-family: var(--helia-font-mono);
  color: var(--helia-fg);
}
.helia-chunk-op,
.helia-chunk-count {
  color: var(--helia-faint);
}
.helia-chunk-status[data-status="ok"] {
  color: #2e7d32;
}
.helia-chunk-status[data-status="error"] {
  color: var(--helia-error-bg);
}
.helia-chunk-code {
  font-family: var(--helia-font-mono);
  font-size: 0.85em;
  line-height: 1.45;
  white-space: pre;
  background: var(--helia-code-bg);
  border-radius: 0 0 var(--helia-radius) var(--helia-radius);
  padding: 0.6em 0.8em;
  overflow-x: auto;
  tab-size: 2;
}
.helia-chunk-code code.helia-raw-inline {
  white-space: pre;
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}
.helia-chunk-code a,
.helia-chunk-code a:visited {
  color: inherit;
  text-decoration: none;
}
.helia-chunk-code a:hover {
  text-decoration: underline;
  text-decoration-color: var(--helia-link-decoration);
}
.helia-chunk-code .helia-tok:target {
  background: var(--helia-mark);
}
.helia-noweb-ref,
.helia-noweb-ref-missing {
  font-style: italic;
  color: var(--helia-accent);
}
.helia-noweb-ref-missing {
  color: var(--helia-error-bg);
}
.helia-chunk-error-line {
  text-decoration: underline wavy var(--helia-error-bg);
  text-decoration-skip-ink: none;
}
.helia-chunk-messages,
.helia-chunk-problems {
  font-size: 0.82em;
  border-left: 3px solid var(--helia-error-bg);
  padding: 0.2em 0.6em;
  margin: 0.3em 0;
}
.helia-chunk-messages code {
  white-space: pre-wrap;
  background: none;
}
.helia-runner {
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius);
  margin: 0.4em 0 0.9em;
  font-size: 0.85em;
}
.helia-runner-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em;
  align-items: center;
  padding: 0.3em 0.4em;
  border-bottom: 1px solid var(--helia-border);
}
.helia-runner-bar button {
  font: inherit;
  padding: 0.1em 0.6em;
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius);
  background: var(--helia-bg);
  color: var(--helia-fg);
  cursor: pointer;
}
.helia-runner-bar button:disabled {
  opacity: 0.5;
  cursor: default;
}
.helia-runner-status,
.helia-runner-label {
  color: var(--helia-muted);
}
.helia-runner-label {
  margin-left: auto;
  font-family: var(--helia-font-mono);
}
.helia-runner-stdin textarea {
  box-sizing: border-box;
  width: 100%;
  min-height: 3em;
  font-family: var(--helia-font-mono);
  font-size: inherit;
  background: var(--helia-bg);
  color: var(--helia-fg);
  border: 0;
  border-top: 1px solid var(--helia-border);
}
.helia-runner-stdin > summary {
  padding: 0.1em 0.5em;
  color: var(--helia-muted);
  cursor: pointer;
}
.helia-runner-out {
  margin: 0;
  border-radius: 0 0 var(--helia-radius) var(--helia-radius);
  min-height: 1.5em;
  max-height: 24em;
  overflow: auto;
  white-space: pre-wrap;
}
.helia-runner-out:empty::before {
  content: "output";
  color: var(--helia-faint);
}
.helia-runner-stderr {
  color: var(--helia-error-bg);
}
.helia-runner-note {
  color: var(--helia-muted);
  font-style: italic;
}

/* ------------------------------------------------------------------
   External sources (@base/external, helia-external).
   Site typography throughout; each source contributes only an accent
   (--helia-ext-accent) and a badge (--helia-ext-badge), set on .helia-ext-<name>
   by the source's scoped stylesheet. */
.helia-ext, .helia-ext-wrap, .helia-ext-link { --helia-ext-accent-c: var(--helia-ext-accent, var(--helia-accent)); }
.helia-ext-link > a { text-decoration-color: var(--helia-ext-accent-c); }
.helia-ext-link > a::after {
  content: var(--helia-ext-badge, "");
  font-size: 0.62em;
  font-family: var(--helia-font-mono);
  color: var(--helia-ext-accent-c);
  vertical-align: super;
  margin-left: 0.2em;
  opacity: 0.8;
}
.helia-ext, .helia-ext-wrap {
  border-left: 3px solid var(--helia-ext-accent-c);
  border-radius: var(--helia-radius);
  margin: 1em 0;
  padding: 0.25em 0 0.25em 0.9em;
}
.helia-ext > details > summary .helia-group-title { font-weight: 600; }
.helia-ext-body > :first-child { margin-top: 0.4em; }
.helia-ext-source {
  font-size: 0.85em;
  color: var(--helia-muted);
  border-top: 1px solid var(--helia-border);
  margin-top: 0.75em;
  padding-top: 0.3em;
}
.helia-ext-badge {
  font-family: var(--helia-font-mono);
  font-size: 0.85em;
  color: var(--helia-ext-accent-c, var(--helia-accent));
  border: 1px solid currentColor;
  border-radius: var(--helia-radius);
  padding: 0 0.3em;
}
.helia-ext-card-title { font-weight: 600; margin-bottom: 0.3em; }
.helia-ext-excerpt { color: var(--helia-fg); }
.helia-ext-commentary {
  margin-top: 0.6em;
  padding-top: 0.4em;
  border-top: 1px dashed var(--helia-border);
}
.helia-ext-html[data-display="block"] { overflow-x: auto; margin: 0.6em 0; text-align: center; }
.helia-ext-html math { font-size: 1.05em; }
.helia-ext-tex { font-family: var(--helia-font-mono); font-size: 0.9em; }
.helia-ext-tree { border-left: 2px solid var(--helia-border); padding-left: 0.75em; margin: 0.75em 0; }
.helia-ext-svg svg { max-width: 100%; height: auto; }
/* Wrapped pages (virtual entries `<source>--<page>`): the header card
   carries the accent; the article itself reads like any page. */
.helia-ext-page-header { font-size: 0.9em; color: var(--helia-muted); padding: 0.4em 0 0.4em 0.9em; overflow-wrap: anywhere; }
.helia-ext.helia-ext-page { border-left: 0; padding-left: 0; }
.helia-ext-page-header .helia-ext-badge { margin-right: 0.2em; }
.helia-ext-full { margin-top: 0.6em; }
.helia-ext-wrapped { font-size: 0.95em; }
section.helia-transclusion > details > .helia-transclusion-body > .helia-ext { margin-top: 0.3em; }

/* Typed links (`link("doi:..")`, @base/links): a small badge before the
   link, coloured by the link type's `style: (accent:)`. */
.helia-link-ext { white-space: normal; }
.helia-link-ext[data-badge]::before {
  content: attr(data-badge);
  display: inline-block;
  margin-right: 0.25em;
  padding: 0 0.3em;
  border-radius: 0.25em;
  font-size: 0.7em;
  font-weight: 600;
  line-height: 1.5;
  vertical-align: 0.12em;
  letter-spacing: 0.02em;
  color: var(--helia-link-accent, var(--helia-accent));
  border: 1px solid color-mix(in srgb, var(--helia-link-accent, var(--helia-accent)) 45%, transparent);
}
.helia-link-ext > a { text-decoration-color: color-mix(in srgb, var(--helia-link-accent, var(--helia-accent)) 60%, transparent); }

/* ---- Reference pages: the "Cite" section (@base/reference) ---- */
.helia-cite-key { margin: 0.4em 0; }
.helia-cite-format { margin: 0.4em 0; }
/* The code block's own summary is redundant inside a titled format group. */
.helia-cite-format details.helia-code > summary { display: none; }
.helia-cite-format pre { max-height: 24em; overflow: auto; }
.helia-cite-files { font-size: 0.9em; color: var(--helia-muted); }
.helia-copy {
  margin-left: 0.6em;
  padding: 0.05em 0.6em;
  font: inherit;
  font-size: 0.8em;
  color: var(--helia-muted);
  background: transparent;
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius);
  cursor: pointer;
}
.helia-copy:hover { color: var(--helia-fg); background: var(--helia-hover); }

/* Query blocks (@base/query): a quiet "Sort" button beside the "N entries"
   summary, opening a small menu of orders (runtime.js). */
.helia-query-sort {
  position: relative;
  display: inline-block;
  margin-left: 0.6em;
  font-size: 0.8em;
  font-weight: 400;
  font-style: normal;
  vertical-align: baseline;
}

.helia-query > details:not([open]) > summary .helia-query-sort {
  display: none;
}

.helia-query-sort-button {
  font: inherit;
  color: var(--helia-muted);
  background: none;
  border: none;
  padding: 0 0.2em;
  cursor: pointer;
}

.helia-query-sort-button::after {
  content: " \25BE";
  font-size: 0.85em;
}

.helia-query-sort-button:hover,
.helia-query-sort-button[aria-expanded="true"] {
  color: var(--helia-accent);
}

.helia-query-sort-menu {
  position: absolute;
  left: 0;
  top: calc(100% + 0.3em);
  z-index: 20;
  display: flex;
  flex-direction: column;
  min-width: 9em;
  padding: 0.3em 0;
  background: var(--helia-bg);
  border: 1px solid var(--helia-border);
  border-radius: var(--helia-radius);
  box-shadow: 0 0.4em 1.2em rgb(0 0 0 / 0.12);
}

.helia-query-sort-menu[hidden] {
  display: none;
}

.helia-query-sort-menu button {
  font: inherit;
  text-align: left;
  color: var(--helia-fg);
  background: none;
  border: none;
  padding: 0.25em 0.9em 0.25em 1.6em;
  cursor: pointer;
  white-space: nowrap;
}

.helia-query-sort-menu button:hover,
.helia-query-sort-menu button:focus-visible {
  background: var(--helia-hover);
  outline: none;
}

.helia-query-sort-menu button[aria-checked="true"]::before {
  content: "\2713";
  display: inline-block;
  width: 1.3em;
  margin-left: -1.3em;
  color: var(--helia-accent);
}

@media print {
  .helia-query-sort {
    display: none;
  }
}

/* Link previews (runtime.js): a quiet card under a hovered or focused entry
   link, cut from the target's page. */
.helia-preview {
  position: absolute;
  z-index: 50;
  box-sizing: border-box;
  width: max-content;
  max-width: min(26rem, calc(100vw - 16px));
  padding: 0.7em 0.9em 0.75em;
  background: var(--helia-bg);
  color: var(--helia-fg);
  border: 1px solid var(--helia-border-strong);
  border-radius: var(--helia-radius, 4px);
  box-shadow: var(--helia-shadow);
  font-size: 0.86rem;
  line-height: 1.45;
  text-align: left;
  pointer-events: auto;
  animation: helia-preview-in 120ms ease-out;
}

@keyframes helia-preview-in {
  from { opacity: 0; transform: translateY(2px); }
}

@media (prefers-reduced-motion: reduce) {
  .helia-preview { animation: none; }
}

.helia-preview-title {
  font-weight: 600;
  line-height: 1.3;
}

.helia-preview-kind {
  display: block;
  margin-bottom: 0.15em;
  font-size: 0.72em;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--helia-faint);
}

.helia-preview-meta {
  margin-top: 0.2em;
  font-size: 0.88em;
  color: var(--helia-muted);
}

.helia-preview-body {
  margin-top: 0.45em;
  padding-top: 0.45em;
  border-top: 1px solid var(--helia-border);
  max-height: 9.5em;
  overflow: hidden;
}

.helia-preview-body.helia-preview-clipped {
  -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent);
  mask-image: linear-gradient(to bottom, #000 70%, transparent);
}

.helia-preview-body > * {
  margin: 0 0 0.4em;
}

.helia-preview-body .helia-math-display {
  margin: 0.3em 0;
  overflow: hidden;
}

.helia-preview-body .helia-abstract {
  font-size: 0.95em;
}