/* ZeroPress Template Docs2 */

:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --canvas: hsl(45 22% 93%);
  --page: hsl(40 22% 97%);
  --chalk: hsl(36 21% 94%);
  --code-bg: hsl(15 5% 16%);

  --ink-dark: hsl(18 8% 21%);
  --ink-base: hsl(24 8% 33%);
  --ink-light: hsl(28 10% 42%);

  --tab-terracotta: hsl(14 38% 40%);
  --tab-sage: hsl(120 12% 40%);
  --tab-ochre: hsl(30 44% 40%);
  --tab-blue: hsl(209 48% 42%);
  --tab-violet: hsl(265 36% 45%);
  --tab-rose: hsl(342 44% 45%);

  --border: hsl(28 9% 51% / 0.2);
  --border-strong: hsl(28 9% 51% / 0.32);
  --radius: 0.75rem;
  --scrim: hsl(18 8% 21% / 0.4);
  --topbar-bg: hsl(40 22% 97% / 0.85);
  --surface-hover: hsl(28 9% 51% / 0.08);
  --active-bg: hsl(14 38% 40% / 0.1);
  --active-border: hsl(14 38% 40% / 0.4);
  --selection-bg: hsl(14 38% 40% / 0.22);
  --focus-ring: var(--tab-terracotta);
  --success-muted: hsl(120 12% 40% / 0.18);
  --code-ui-bg: hsl(0 0% 100% / 0.08);
  --code-ui-bg-hover: hsl(0 0% 100% / 0.14);
  --code-ui-border: hsl(0 0% 100% / 0.12);
  --code-ui-border-hover: hsl(0 0% 100% / 0.2);
  --code-ui-text: hsl(40 22% 97% / 0.7);
  --code-ui-text-hover: hsl(40 22% 97% / 0.92);
  --code-selection: hsl(40 22% 97% / 0.22);
  --code-label-bg: hsl(0 0% 100% / 0.06);
  --code-label-border: hsl(0 0% 100% / 0.1);
  --code-label-text: hsl(40 22% 97% / 0.7);
  --code-label-success: hsl(120 14% 62%);
  --scrollbar-thumb: hsl(28 9% 51% / 0.36);
  --scrollbar-thumb-hover: hsl(14 38% 40% / 0.48);
  --code-scrollbar-thumb: hsl(40 22% 97% / 0.22);
  --code-scrollbar-thumb-hover: hsl(40 22% 97% / 0.38);
  --cmdk-mark-bg: hsl(14 38% 40% / 0.18);
  --search-hit-bg: hsl(43 92% 56% / 0.24);
  --search-hit-ring: hsl(43 92% 56% / 0.2);
  --search-hit-current-bg: hsl(14 38% 40% / 0.28);
  --search-hit-current-ring: hsl(14 38% 40% / 0.24);
  --progress-track: hsl(28 9% 51% / 0.24);
  --icon-external-link: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M15 3h6v6'/%3E%3Cpath d='M10 14 21 3'/%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'/%3E%3C/svg%3E");
  --alert-note-color: hsl(212 72% 42%);
  --alert-note-bg: hsl(212 72% 42% / 0.08);
  --alert-tip-color: hsl(145 48% 32%);
  --alert-tip-bg: hsl(145 48% 32% / 0.08);
  --alert-important-color: hsl(262 45% 46%);
  --alert-important-bg: hsl(262 45% 46% / 0.08);
  --alert-warning-color: hsl(36 88% 30%);
  --alert-warning-bg: hsl(36 88% 30% / 0.1);
  --alert-caution-color: hsl(358 58% 45%);
  --alert-caution-bg: hsl(358 58% 45% / 0.08);

  --topbar-h: 3.75rem;
  --sidebar-w: 18rem;
  --content-w: 46rem;
}

:root[data-theme="dark"] {
  --canvas: hsl(20 8% 9%);
  --page: hsl(22 8% 12%);
  --chalk: hsl(24 7% 17%);
  --code-bg: hsl(18 9% 7%);

  --ink-dark: hsl(38 25% 92%);
  --ink-base: hsl(34 14% 78%);
  --ink-light: hsl(30 9% 58%);

  --tab-terracotta: hsl(14 42% 66%);
  --tab-sage: hsl(120 14% 62%);
  --tab-ochre: hsl(32 50% 70%);
  --tab-blue: hsl(209 58% 68%);
  --tab-violet: hsl(265 45% 72%);
  --tab-rose: hsl(342 56% 70%);

  --border: hsl(30 9% 58% / 0.18);
  --border-strong: hsl(30 9% 58% / 0.3);
  --topbar-bg: hsl(22 8% 12% / 0.85);
  --active-bg: hsl(14 42% 66% / 0.14);
  --active-border: hsl(14 42% 66% / 0.42);
  --selection-bg: hsl(14 42% 66% / 0.34);
  --scrollbar-thumb: hsl(30 9% 58% / 0.42);
  --scrollbar-thumb-hover: hsl(12 55% 65% / 0.5);
  --code-scrollbar-thumb: hsl(40 22% 97% / 0.24);
  --code-scrollbar-thumb-hover: hsl(40 22% 97% / 0.42);
  --cmdk-mark-bg: hsl(12 55% 65% / 0.22);
  --search-hit-bg: hsl(43 92% 66% / 0.2);
  --search-hit-ring: hsl(43 92% 66% / 0.22);
  --search-hit-current-bg: hsl(12 55% 65% / 0.3);
  --search-hit-current-ring: hsl(12 55% 65% / 0.24);
  --alert-note-color: hsl(212 82% 68%);
  --alert-note-bg: hsl(212 82% 68% / 0.1);
  --alert-tip-color: hsl(145 48% 64%);
  --alert-tip-bg: hsl(145 48% 64% / 0.1);
  --alert-important-color: hsl(262 66% 74%);
  --alert-important-bg: hsl(262 66% 74% / 0.1);
  --alert-warning-color: hsl(39 92% 66%);
  --alert-warning-bg: hsl(39 92% 66% / 0.11);
  --alert-caution-color: hsl(358 78% 70%);
  --alert-caution-bg: hsl(358 78% 70% / 0.1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --canvas: hsl(20 8% 9%);
    --page: hsl(22 8% 12%);
    --chalk: hsl(24 7% 17%);
    --code-bg: hsl(18 9% 7%);

    --ink-dark: hsl(38 25% 92%);
    --ink-base: hsl(34 14% 78%);
    --ink-light: hsl(30 9% 58%);

    --tab-terracotta: hsl(14 42% 66%);
    --tab-sage: hsl(120 14% 62%);
    --tab-ochre: hsl(32 50% 70%);
    --tab-blue: hsl(209 58% 68%);
    --tab-violet: hsl(265 45% 72%);
    --tab-rose: hsl(342 56% 70%);

    --border: hsl(30 9% 58% / 0.18);
    --border-strong: hsl(30 9% 58% / 0.3);
    --topbar-bg: hsl(22 8% 12% / 0.85);
    --active-bg: hsl(14 42% 66% / 0.14);
    --active-border: hsl(14 42% 66% / 0.42);
    --selection-bg: hsl(14 42% 66% / 0.34);
    --scrollbar-thumb: hsl(30 9% 58% / 0.42);
    --scrollbar-thumb-hover: hsl(12 55% 65% / 0.5);
    --code-scrollbar-thumb: hsl(40 22% 97% / 0.24);
    --code-scrollbar-thumb-hover: hsl(40 22% 97% / 0.42);
    --cmdk-mark-bg: hsl(12 55% 65% / 0.22);
    --search-hit-bg: hsl(43 92% 66% / 0.2);
    --search-hit-ring: hsl(43 92% 66% / 0.22);
    --search-hit-current-bg: hsl(12 55% 65% / 0.3);
    --search-hit-current-ring: hsl(12 55% 65% / 0.24);
    --alert-note-color: hsl(212 82% 68%);
    --alert-note-bg: hsl(212 82% 68% / 0.1);
    --alert-tip-color: hsl(145 48% 64%);
    --alert-tip-bg: hsl(145 48% 64% / 0.1);
    --alert-important-color: hsl(262 66% 74%);
    --alert-important-bg: hsl(262 66% 74% / 0.1);
    --alert-warning-color: hsl(39 92% 66%);
    --alert-warning-bg: hsl(39 92% 66% / 0.11);
    --alert-caution-color: hsl(358 78% 70%);
    --alert-caution-bg: hsl(358 78% 70% / 0.1);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

::selection {
  background: var(--selection-bg);
  color: var(--ink-dark);
}

html {
  scrollbar-gutter: stable;
  scrollbar-color: var(--scrollbar-thumb) var(--page);
}
html.is-scroll-enhanced {
  scroll-behavior: smooth;
}
body {
  background: var(--canvas);
  color: var(--ink-base);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.65;
  scrollbar-color: var(--scrollbar-thumb) var(--page);
}

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--page); }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border: 3px solid var(--page);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }
::-webkit-scrollbar-corner { background: var(--page); }

a { color: inherit; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--tab-terracotta); color: var(--page);
  padding: 0.5rem 0.75rem; border-radius: var(--radius);
}
.skip-link:focus { left: 1rem; top: 1rem; z-index: 100; }

/* ===== Sidebar ===== */
.nav-toggle {
  position: fixed;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  border: 0;
  opacity: 0;
  pointer-events: none;
}
.nav-overlay {
  display: none; position: fixed; inset: 0; z-index: 40;
  background: var(--scrim); backdrop-filter: blur(2px);
}
.sidebar {
  position: fixed; top: var(--topbar-h); left: 0; bottom: 0; width: var(--sidebar-w);
  background: var(--canvas);
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  z-index: 50; overflow-y: auto;
  transition: transform 0.25s ease;
  scrollbar-color: var(--scrollbar-thumb) var(--canvas);
}
.sidebar::-webkit-scrollbar-track { background: var(--canvas); }
.sidebar::-webkit-scrollbar-thumb { border-color: var(--canvas); }
.sidebar::-webkit-scrollbar-corner { background: var(--canvas); }
.sidebar__inner { padding: 2rem 1.75rem; }

.sidebar__nav { display: flex; flex-direction: column; gap: 1.5rem; }
.sidebar__group { padding: 0; margin: 0; }
.sidebar__items,
.sidebar__children {
  list-style: none;
  display: flex;
  flex-direction: column;
}
.sidebar__items {
  gap: 0.125rem;
  margin: 0.5rem 0 0;
  padding: 0 0 0 0.75rem;
}
.sidebar__children {
  gap: 0.05rem;
  margin: 0.15rem 0 0.45rem 0.55rem;
  padding: 0.15rem 0 0.15rem 0.7rem;
  border-left: 1px solid var(--border);
}
.sidebar__title {
  display: flex; align-items: center; gap: 0.5rem;
  margin: 0; padding: 0.25rem 0;
  font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.08em; color: var(--ink-light);
  font-family: var(--font-sans);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.sidebar__title::-webkit-details-marker { display: none; }
.sidebar__title-label { flex: 1; }
.sidebar__chevron {
  flex: 0 0 auto;
  color: var(--ink-light);
  opacity: 0.7;
  transform: rotate(90deg);
  transition: transform 0.18s ease, opacity 0.15s ease;
}
.sidebar__group[open] .sidebar__chevron { transform: rotate(-90deg); }
.sidebar__title:hover { color: var(--ink-dark); }
.sidebar__title:hover .sidebar__chevron { opacity: 1; }
.sidebar__group:not([open]) .sidebar__title { color: var(--ink-light); }
.sidebar__accent { width: 0.25rem; height: 0.75rem; border-radius: 999px; display: inline-block; }
.sidebar__group { --group-accent: var(--tab-terracotta); }
.sidebar__group:nth-of-type(6n + 1) { --group-accent: var(--tab-terracotta); }
.sidebar__group:nth-of-type(6n + 2) { --group-accent: var(--tab-sage); }
.sidebar__group:nth-of-type(6n + 3) { --group-accent: var(--tab-ochre); }
.sidebar__group:nth-of-type(6n + 4) { --group-accent: var(--tab-blue); }
.sidebar__group:nth-of-type(6n + 5) { --group-accent: var(--tab-violet); }
.sidebar__group:nth-of-type(6n + 6) { --group-accent: var(--tab-rose); }
.sidebar__group--terracotta { --group-accent: var(--tab-terracotta); }
.sidebar__group--sage { --group-accent: var(--tab-sage); }
.sidebar__group--ochre { --group-accent: var(--tab-ochre); }
.sidebar__group--blue { --group-accent: var(--tab-blue); }
.sidebar__group--violet { --group-accent: var(--tab-violet); }
.sidebar__group--rose { --group-accent: var(--tab-rose); }
.sidebar__group .sidebar__accent { background: var(--group-accent); }
.sidebar__link {
  display: block; padding: 0.375rem 0.625rem; border-radius: 0.375rem;
  font-size: 0.875rem; color: var(--ink-base); text-decoration: none;
  transition: background 0.12s, color 0.12s;
  font-weight: 500;
}
.sidebar__link--top { font-weight: 600; }
.sidebar__link--child {
  font-size: 0.82rem;
  padding: 0.32rem 0.55rem;
}
.sidebar__link:hover { background: var(--surface-hover); color: var(--ink-dark); }
.sidebar__link[data-current-parent="true"] {
  color: var(--tab-terracotta);
  font-weight: 600;
}
.sidebar__link[aria-current="page"] {
  background: var(--active-bg); color: var(--tab-terracotta); font-weight: 600;
}

/* ===== Page shell ===== */
.page-shell {
  margin-left: var(--sidebar-w);
  background: var(--page);
  min-height: calc(100dvh - var(--topbar-h));
  box-shadow: -8px 0 24px hsl(18 8% 21% / 0.03);
  display: flex; flex-direction: column;
}
.doc-main { flex: 1; min-width: 0; padding: 3rem 4rem 2rem; }

/* ===== Top bar ===== */
.top-bar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 0.75rem;
  min-height: var(--topbar-h);
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--topbar-bg);
  backdrop-filter: saturate(180%) blur(8px);
}
.top-bar__brand {
  font-family: var(--font-serif); font-size: 1rem; font-weight: 500;
  color: var(--ink-dark); text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.top-bar__brand-mark {
  width: 1.25rem;
  height: 1.25rem;
  object-fit: contain;
  flex: 0 0 auto;
}
.top-bar__actions { margin-left: auto; display: flex; align-items: center; gap: 0.5rem; }
.top-bar__search span { display: none; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  height: 2.25rem; padding: 0 0.625rem; min-width: 2.25rem;
  border: 1px solid var(--border); border-radius: 0.5rem;
  background: var(--page); color: var(--ink-base); cursor: pointer;
  font: inherit; font-size: 0.8rem;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.icon-btn:hover { color: var(--tab-terracotta); border-color: var(--active-border); }
.icon-btn:disabled,
.icon-btn:disabled:hover {
  color: var(--ink-base);
  border-color: var(--border);
  cursor: not-allowed;
}
.kbd {
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--ink-light); background: var(--canvas);
  border: 1px solid var(--border); padding: 0.05rem 0.35rem; border-radius: 0.25rem;
}
/* Theme toggle icons */
.theme-toggle .theme-toggle__icon { display: none; }
[data-theme="light"] .theme-toggle .theme-toggle__icon--sun { display: inline-block; }
[data-theme="dark"] .theme-toggle .theme-toggle__icon--moon { display: inline-block; }
:root:not([data-theme]) .theme-toggle .theme-toggle__icon--sun { display: inline-block; }

/* Focus rings — uniform terracotta accent */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 0.35rem;
}
.icon-btn:focus-visible,
.button-link:focus-visible,
.cmdk__list a:focus-visible,
.cmdk__list button:focus-visible {
  outline-offset: 2px;
}
.sidebar__link:focus-visible,
.toc__item a:focus-visible {
  outline-offset: -2px;
}
.cmdk__field input:focus-visible {
  outline: none;
}
.cmdk__field:focus-within {
  outline: none;
  border-bottom-color: var(--tab-terracotta);
}

.nav-trigger { display: none; }

/* ===== Article ===== */
.doc-article { max-width: 78rem; margin: 0 auto; }

.eyebrow {
  margin: 0 0 1rem; font-size: 0.8rem; font-weight: 500;
  color: var(--ink-light);
}
.lede {
  margin: 0; font-size: 1.25rem; font-weight: 300; line-height: 1.55;
  color: var(--ink-base); max-width: 45ch; text-wrap: pretty;
}

.article-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 4rem; }
@media (min-width: 1180px) {
  .article-grid { grid-template-columns: minmax(0, var(--content-w)) 14rem; }
}
.article-content { max-width: var(--content-w); min-width: 0; }

/* ===== Prose ===== */
.prose {
  max-width: var(--content-w);
  overflow-wrap: break-word;
  word-wrap: break-word;
}
.prose > * + * { margin-top: 1.25rem; }

.prose h1,
.prose h2,
.prose h3 {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.prose h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-serif);
  font-size: 2.75rem; font-weight: 500;
  letter-spacing: -0.02em; line-height: 1.1;
  color: var(--ink-dark);
  text-wrap: balance;
}
.prose h2 {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 1.65rem; letter-spacing: -0.01em;
  color: var(--ink-dark); margin-top: 3.5rem; margin-bottom: 1.25rem;
  scroll-margin-top: 5rem;
  position: relative;
}
.prose h3 {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 1.3rem; color: var(--ink-dark);
  margin-top: 2.5rem; margin-bottom: 1rem; scroll-margin-top: 5rem;
  position: relative;
}
.prose h4 {
  font-family: var(--font-sans); font-weight: 700;
  font-size: 1rem; color: var(--ink-dark);
  margin-top: 2rem; margin-bottom: 0.75rem; scroll-margin-top: 5rem;
  position: relative;
}

/* Heading anchor links */
.prose .heading-anchor {
  position: absolute;
  left: -1.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 0.25rem;
  color: var(--ink-light);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.prose .heading-anchor:hover,
.prose .heading-anchor:focus-visible,
.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.prose h4:hover .heading-anchor {
  opacity: 1;
  color: var(--tab-terracotta);
}
.prose .heading-anchor.is-copied,
.prose .heading-anchor.is-copied:hover {
  background: var(--success-muted);
  color: var(--tab-sage);
  opacity: 1;
}
@media (max-width: 1023px) {
  .prose .heading-anchor { left: auto; right: -1.5rem; }
}
.prose p { color: var(--ink-base); }
.prose ul, .prose ol { padding-left: 1.5rem; color: var(--ink-base); }
.prose li + li { margin-top: 0.4rem; }
.prose a { color: var(--tab-terracotta); text-decoration: underline; text-underline-offset: 3px; }
.prose a[target="_blank"]::after,
.site-footer a[target="_blank"]::after {
  content: "";
  display: inline-block;
  width: 0.72em;
  height: 0.72em;
  margin-left: 0.25em;
  vertical-align: 0.02em;
  background: currentColor;
  opacity: 0.72;
  -webkit-mask: var(--icon-external-link) center / contain no-repeat;
  mask: var(--icon-external-link) center / contain no-repeat;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.75rem 0;
}
.prose blockquote {
  margin: 2rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--tab-terracotta);
  color: var(--ink-base);
}
.prose blockquote > *:first-child { margin-top: 0; }
.prose blockquote > *:last-child { margin-bottom: 0; }
.prose code:not(pre code) {
  background: var(--chalk); color: var(--tab-terracotta);
  padding: 0.125rem 0.4rem; border-radius: 0.25rem; font-size: 0.875em;
  font-family: var(--font-mono);
}
.prose table {
  display: table;
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  font-size: 0.92rem;
  table-layout: auto;
}
.prose th,
.prose td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: normal;
}
.prose th {
  color: var(--ink-dark);
  font-weight: 600;
  background: var(--chalk);
}
.prose th.zp-align-left,
.prose td.zp-align-left { text-align: left; }
.prose th.zp-align-center,
.prose td.zp-align-center { text-align: center; }
.prose th.zp-align-right,
.prose td.zp-align-right { text-align: right; }
.prose tr:last-child td { border-bottom-color: var(--border-strong); }
.prose .contains-task-list {
  list-style: none;
  padding-left: 0;
}
.prose .task-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}
.prose .task-list-item-checkbox {
  flex: 0 0 auto;
  margin-top: 0.4rem;
  width: 1rem;
  height: 1rem;
  appearance: none;
  border: 2px solid var(--ink-light);
  border-radius: 0.25rem;
  background: var(--page);
  display: inline-grid;
  place-content: center;
}
.prose .task-list-item-checkbox:checked {
  border-color: var(--tab-sage);
  background: var(--tab-sage);
}
.prose .task-list-item-checkbox:checked::after {
  content: "";
  width: 0.35rem;
  height: 0.6rem;
  border: solid var(--page);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translateY(-0.05rem);
}
.prose img {
  max-width: 100%;
  height: auto;
}
.prose iframe,
.prose video,
.prose audio {
  display: block;
  max-width: 100%;
  margin: 1.5rem 0;
}
.prose iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: var(--radius);
}
.prose video {
  height: auto;
  color-scheme: light;
  border-radius: var(--radius);
}
.prose audio {
  width: 100%;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .prose video,
  :root:not([data-theme="light"]) .prose audio {
    color-scheme: dark;
  }
}
:root[data-theme="dark"] .prose video,
:root[data-theme="dark"] .prose audio {
  color-scheme: dark;
}
.prose figure {
  margin: 2rem 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--chalk);
}
.prose figure img {
  display: block;
  margin: 0 auto;
}
.prose figcaption {
  margin-top: 0.75rem;
  color: var(--ink-light);
  font-size: 0.85rem;
  text-align: center;
}
.zp-alert {
  --alert-color: var(--tab-terracotta);
  margin: 1.5rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-left-color: var(--alert-color);
  border-radius: var(--radius);
  background: var(--chalk);
}
.zp-alert .zp-alert__title {
  margin: 0 0 0.35rem;
  color: var(--alert-color);
  font-weight: 700;
}
.zp-alert > *:last-child { margin-bottom: 0; }
.zp-alert--note {
  --alert-color: var(--alert-note-color);
  background: var(--alert-note-bg);
}
.zp-alert--tip {
  --alert-color: var(--alert-tip-color);
  background: var(--alert-tip-bg);
}
.zp-alert--important {
  --alert-color: var(--alert-important-color);
  background: var(--alert-important-bg);
}
.zp-alert--warning {
  --alert-color: var(--alert-warning-color);
  background: var(--alert-warning-bg);
}
.zp-alert--caution {
  --alert-color: var(--alert-caution-color);
  background: var(--alert-caution-bg);
}
.zp-mermaid {
  margin: 1.5rem 0;
  overflow-x: auto;
  text-align: center;
}
.zp-mermaid svg {
  max-width: 100%;
  height: auto;
}
.zp-mermaid-error {
  text-align: left;
  white-space: pre-wrap;
}

/* Code block */
.prose pre {
  position: relative;
  background: var(--code-bg);
  border-radius: 0.75rem;
  /* Top strip reserved for language label + copy button */
  padding: 0;
  overflow: visible;
  font-family: var(--font-mono);
  font-size: 0.85rem; line-height: 1.7;
  color: hsl(40 22% 97% / 0.9);
  box-shadow: inset 0 2px 10px hsl(0 0% 0% / 0.2);
  tab-size: 2;
  -moz-tab-size: 2;
}
.prose pre code {
  display: block;
  overflow-x: auto;
  padding: 2.4rem 1.5rem 1.25rem;
  border-radius: 0.75rem;
  background: transparent;
  color: inherit;
  font-size: inherit;
  scrollbar-color: var(--code-scrollbar-thumb) var(--code-bg);
  -webkit-overflow-scrolling: touch;
}
/* Keyboard focus for horizontally scrollable code (tabindex set via JS) */
.prose pre code:focus-visible {
  outline: 2px solid var(--tab-terracotta);
  outline-offset: 2px;
}
.prose pre::selection,
.prose pre *::selection {
  background: var(--code-selection);
  /* Code blocks always use a dark background in both color modes, so force a
     light selected-text color instead of inheriting the page ink (which is dark
     in light mode and would make selected code nearly invisible). */
  color: hsl(40 22% 97%);
}
.prose pre code::-webkit-scrollbar-track {
  background: var(--code-bg);
}
.prose pre code::-webkit-scrollbar-thumb {
  background: var(--code-scrollbar-thumb);
  border-color: var(--code-bg);
}
.prose pre code::-webkit-scrollbar-thumb:hover {
  background: var(--code-scrollbar-thumb-hover);
}
.copy-btn {
  position: absolute; top: 0.5rem; right: 0.6rem; z-index: 2;
  display: inline-flex; align-items: center; gap: 0.3rem;
  font: inherit; font-size: 0.7rem; padding: 0.2rem 0.55rem;
  background: var(--code-ui-bg); color: var(--code-ui-text);
  border: 1px solid var(--code-ui-border); border-radius: 0.35rem; cursor: pointer;
  opacity: 0; transition: opacity 0.15s, background 0.15s, color 0.15s, border-color 0.15s;
  font-family: var(--font-sans);
}
.copy-btn:hover {
  background: var(--code-ui-bg-hover);
  color: var(--code-ui-text-hover);
  border-color: var(--code-ui-border-hover);
}
.copy-btn .icon { width: 0.85rem; height: 0.85rem; }
.copy-btn.is-copied {
  color: var(--code-label-success);
  border-color: hsl(120 12% 40% / 0.5);
  background: hsl(120 12% 40% / 0.16);
  opacity: 1;
}
.prose pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
/* Touch / no-hover devices: copy button is always discoverable */
@media (hover: none), (pointer: coarse) {
  .copy-btn { opacity: 1; }
}

/* highlight.js output from ZeroPress Markdown rendering */
.hljs-keyword,
.hljs-literal,
.hljs-selector-tag,
.hljs-section,
.hljs-title {
  color: hsl(12 72% 72%);
}
.hljs-string,
.hljs-regexp,
.hljs-template-tag,
.hljs-template-variable {
  color: hsl(33 76% 72%);
}
.hljs-number,
.hljs-symbol,
.hljs-bullet,
.hljs-variable,
.hljs-params {
  color: hsl(120 24% 70%);
}
.hljs-built_in,
.hljs-type,
.hljs-class .hljs-title,
.hljs-title.class_,
.hljs-title.function_ {
  color: hsl(188 47% 72%);
}
.hljs-attr,
.hljs-attribute,
.hljs-name,
.hljs-property {
  color: hsl(48 62% 76%);
}
.hljs-comment,
.hljs-quote,
.hljs-meta {
  color: hsl(40 22% 97% / 0.62);
  font-style: italic;
}
.hljs-punctuation,
.hljs-operator {
  color: hsl(40 22% 97% / 0.58);
}
.hljs-tag {
  color: hsl(188 47% 72%);
}
.hljs-emphasis {
  font-style: italic;
}
.hljs-strong {
  font-weight: 600;
}
.hljs-deletion {
  color: hsl(12 72% 72%);
  background: hsl(12 72% 72% / 0.12);
}
.hljs-addition {
  color: hsl(120 24% 70%);
  background: hsl(120 24% 70% / 0.12);
}

/* TOC */
.toc { font-size: 0.85rem; }
@media (min-width: 1180px) {
  .toc { position: sticky; top: 5rem; align-self: start; }
}
@media (max-width: 1179px) {
  .toc { display: none; }
}
.toc__title {
  margin: 0 0 0.75rem; font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.08em; color: var(--ink-light);
}
.toc ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; border-left: 1px solid var(--border); }
.toc__item a {
  display: block; padding: 0.15rem 0.85rem; color: var(--ink-light);
  text-decoration: none; border-left: 2px solid transparent; margin-left: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.toc__item a:hover { color: var(--ink-dark); }
.toc__item.is-active a, .toc__item a.is-active {
  color: var(--tab-terracotta); border-left-color: var(--tab-terracotta);
}
.toc__item--level-3 a { padding-left: 1.5rem; font-size: 0.8rem; }
.toc__item--level-4 a { padding-left: 3rem; font-size: 0.8rem; }

/* Page meta footer (source / last-updated) */
.page-meta {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border);
}
.page-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--ink-light);
}
.page-meta__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink-base);
  text-decoration: none;
  transition: color 0.15s;
}
.page-meta__link:hover {
  color: var(--tab-terracotta);
}
.page-meta__link svg { color: var(--ink-light); }
.page-meta__link:hover svg { color: var(--tab-terracotta); }
.page-meta__updated { margin-left: auto; }

/* Code block language label */
.prose pre[class*="language-"]::before {
  content: attr(data-language);
  position: absolute;
  top: 0.5rem;
  left: 0.85rem;
  padding: 0.1rem 0.5rem;
  border-radius: 0.25rem;
  background: var(--code-label-bg);
  border: 1px solid var(--code-label-border);
  color: var(--code-label-text);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  pointer-events: none;
}
/* Pager */
.pager {
  display: flex; justify-content: space-between; align-items: center; gap: 1.5rem;
  margin-top: 5rem; padding-top: 2rem; border-top: 1px solid var(--border);
}
.pager a { display: flex; flex-direction: column; gap: 0.25rem; text-decoration: none; }
.pager__next { margin-left: auto; text-align: right; }
.pager__kicker {
  font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.08em; color: var(--ink-light);
}
.pager__label { font-family: var(--font-serif); font-size: 1.15rem; color: var(--ink-dark); }
.pager a:hover .pager__label { color: var(--tab-terracotta); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 2rem; padding: 1.5rem 4rem; }
.site-footer__inner {
  display: flex; flex-direction: column; gap: 0.5rem;
  font-size: 0.85rem; color: var(--ink-light);
}
@media (min-width: 640px) {
  .top-bar__search {
    min-width: 11rem;
    justify-content: flex-start;
  }
  .top-bar__search span {
    display: inline;
  }
  .site-footer__inner { flex-direction: row; justify-content: space-between; align-items: center; }
}
.site-footer__links { display: flex; gap: 1rem; flex-wrap: wrap; }
.site-footer__links a { text-decoration: none; }
.site-footer__links a:hover { color: var(--ink-dark); }
.site-footer__attribution { font-size: 0.75rem; color: var(--ink-light); margin-top: 0.5rem; }
.site-footer__attribution a { color: var(--tab-terracotta); }

/* 404 */
.not-found { text-align: center; padding: 5rem 0; max-width: 36rem; margin: 0 auto; }
.button-link {
  display: inline-block; padding: 0.6rem 1.25rem; border-radius: 0.5rem;
  background: var(--tab-terracotta); color: var(--page);
  text-decoration: none; font-weight: 500; margin-top: 1rem;
  border: 1px solid var(--tab-terracotta);
  cursor: pointer;
  font: inherit;
  font-weight: 500;
}
.button-link--ghost {
  background: transparent;
  color: var(--ink-base);
  border-color: var(--border-strong);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.button-link--ghost:hover {
  background: var(--chalk);
  color: var(--ink-dark);
}
.button-link:disabled,
.button-link:disabled:hover {
  cursor: not-allowed;
  background: transparent;
  color: var(--ink-base);
  border-color: var(--border-strong);
}

/* Command palette */
.cmdk { position: fixed; inset: 0; z-index: 100; display: flex; align-items: flex-start; justify-content: center; padding: 8vh 1rem 1rem; }
.cmdk[hidden] { display: none; }
.cmdk__backdrop { position: absolute; inset: 0; background: hsl(18 8% 21% / 0.45); backdrop-filter: blur(4px); }
.cmdk__panel {
  position: relative; width: 100%; max-width: 36rem;
  background: var(--page); border: 1px solid var(--border-strong);
  border-radius: 0.85rem; box-shadow: 0 24px 60px hsl(0 0% 0% / 0.2);
  overflow: hidden;
}
.cmdk__panel:focus-within {
  border-color: var(--tab-terracotta);
  box-shadow: 0 24px 60px hsl(0 0% 0% / 0.2), 0 0 0 1px var(--active-border);
}
.cmdk__field {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1rem; border-bottom: 1px solid var(--border);
  border-radius: calc(0.85rem - 1px) calc(0.85rem - 1px) 0 0;
  color: var(--ink-light);
}
.cmdk__field input {
  flex: 1; border: 0; background: transparent; outline: none;
  font: inherit; font-size: 0.95rem; color: var(--ink-dark);
}
.cmdk__list {
  list-style: none; padding: 0.5rem; margin: 0; max-height: 50vh; overflow-y: auto;
  scrollbar-color: var(--scrollbar-thumb) var(--page);
}
.cmdk__list li { display: block; }
.cmdk__list a, .cmdk__list button {
  display: flex; gap: 0.6rem; width: 100%;
  padding: 0.5rem 0.75rem; border-radius: 0.5rem;
  text-decoration: none; color: var(--ink-base); font: inherit;
  border: 0; background: transparent; text-align: left; cursor: pointer;
}
.cmdk__list a:hover, .cmdk__list a.is-active, .cmdk__list button:hover, .cmdk__list button.is-active {
  background: var(--active-bg); color: var(--tab-terracotta);
}
.cmdk__result {
  align-items: flex-start;
  flex-direction: column;
}
.cmdk__result-title {
  color: var(--ink-dark);
  font-weight: 600;
}
.cmdk__result-excerpt {
  color: var(--ink-light);
  font-size: 0.78rem;
  line-height: 1.45;
}
.cmdk__result:hover .cmdk__result-title,
.cmdk__result.is-active .cmdk__result-title {
  color: var(--tab-terracotta);
}
.cmdk__list mark {
  background: var(--cmdk-mark-bg);
  color: var(--tab-terracotta);
  border-radius: 0.2rem;
  padding: 0 0.12rem;
}
.cmdk__empty { padding: 1rem; text-align: center; color: var(--ink-light); font-size: 0.9rem; }

.prose mark.search-hit {
  background: var(--search-hit-bg);
  color: inherit;
  border-radius: 0.22rem;
  box-shadow: 0 0 0 0.08rem var(--search-hit-ring);
  padding: 0 0.12rem;
}
.prose mark.search-hit.is-current {
  background: var(--search-hit-current-bg);
  box-shadow: 0 0 0 0.12rem var(--search-hit-current-ring);
}

/* ===== Default icon sizing ===== */
.icon { display: inline-block; vertical-align: middle; flex-shrink: 0; }

/* ===== 404 actions ===== */
.not-found__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-top: 1.5rem;
}
.not-found__actions .button-link {
  margin-top: 0;
}

/* ===== Floating actions ===== */
.floating-actions {
  position: fixed;
  right: max(1.1rem, env(safe-area-inset-right));
  bottom: max(1.1rem, env(safe-area-inset-bottom));
  z-index: 35;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.65rem;
  pointer-events: none;
}
.floating-actions > button {
  pointer-events: auto;
}
.clear-search-highlights {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.7rem;
  height: 2.7rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 0.78rem;
  background: var(--page);
  color: var(--tab-terracotta);
  cursor: pointer;
  box-shadow: 0 0.6rem 1.4rem hsl(18 8% 21% / 0.14);
  transition:
    background 0.16s ease,
    border-color 0.16s ease,
    color 0.16s ease,
    box-shadow 0.16s ease,
    transform 0.16s ease;
}
.clear-search-highlights[hidden] {
  display: none;
}
.clear-search-highlights:hover,
.clear-search-highlights:focus-visible {
  border-color: var(--tab-terracotta);
  background: var(--tab-terracotta);
  color: var(--page);
  box-shadow: 0 0.75rem 1.7rem hsl(18 8% 21% / 0.2);
  transform: translateY(-0.08rem);
}

/* ===== Back to top / reading progress ===== */
.back-to-top {
  --scroll-progress-angle: 0deg;
  width: 3.1rem;
  height: 3.1rem;
  padding: 0;
  border: 0;
  border-radius: 0.85rem;
  background:
    conic-gradient(
      var(--tab-terracotta) var(--scroll-progress-angle),
      var(--progress-track) 0
    );
  color: var(--tab-terracotta);
  cursor: pointer;
  box-shadow: 0 0.7rem 1.7rem hsl(18 8% 21% / 0.16);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem) scale(0.96);
  transition:
    opacity 0.16s ease,
    transform 0.16s ease,
    box-shadow 0.16s ease;
}
.back-to-top[hidden] {
  display: none;
}
.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}
.back-to-top__inner {
  position: absolute;
  inset: 0.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 0.67rem;
  background: var(--page);
  color: var(--tab-terracotta);
  transition:
    background 0.16s ease,
    color 0.16s ease,
    border-color 0.16s ease;
}
.back-to-top:hover,
.back-to-top:focus-visible {
  box-shadow: 0 0.85rem 2rem hsl(18 8% 21% / 0.22);
}
.back-to-top:hover .back-to-top__inner,
.back-to-top:focus-visible .back-to-top__inner {
  border-color: var(--tab-terracotta);
  background: var(--tab-terracotta);
  color: var(--page);
}

/* Mobile */
@media (max-width: 1023px) {
  .sidebar {
    transform: translateX(-100%);
    /* Off-canvas: remove from tab order and assistive tech when closed.
       visibility transitions in after the slide-out completes. */
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0s linear 0.25s;
  }
  .nav-toggle:checked ~ .sidebar {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.25s ease, visibility 0s linear 0s;
  }
  .nav-toggle:checked ~ .nav-overlay { display: block; }
  .page-shell { margin-left: 0; }
  .nav-trigger { display: inline-flex; }
  .doc-main { padding: 2rem 1.5rem 2rem; }
  .site-footer { padding: 1.5rem; }
  .prose h1 { font-size: 2.1rem; }
  .lede { font-size: 1.1rem; }
  .floating-actions {
    right: max(0.9rem, env(safe-area-inset-right));
    bottom: max(0.9rem, env(safe-area-inset-bottom));
  }
  .clear-search-highlights {
    width: 2.65rem;
    height: 2.65rem;
  }
  .back-to-top {
    width: 2.9rem;
    height: 2.9rem;
  }
  .prose table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}
/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html.is-scroll-enhanced { scroll-behavior: auto; }
  .sidebar { transition: none; }
  .clear-search-highlights,
  .back-to-top { transition: none; }
}

/* ===== Print stylesheet ===== */
@media print {
  @page {
    margin: 1.6cm;
  }

  :root,
  :root[data-theme="dark"],
  :root[data-theme="light"] {
    color-scheme: light;
    --canvas: #ffffff;
    --page: #ffffff;
    --chalk: #f5f5f5;
    --code-bg: #f5f5f5;
    --ink-dark: #111111;
    --ink-base: #222222;
    --ink-light: #555555;
    --border: #cccccc;
    --border-strong: #999999;
  }
  html, body { background: #ffffff !important; color: #000 !important; }

  /* Hide chrome */
  .sidebar,
  .top-bar,
  .nav-overlay,
  .nav-toggle,
  .cmdk,
  .pager,
  .copy-btn,
  .skip-link,
  .heading-anchor,
  .site-footer,
  .floating-actions,
  .clear-search-highlights,
  .back-to-top,
  .theme-toggle {
    display: none !important;
  }

  .page-shell {
    margin-left: 0 !important;
    box-shadow: none !important;
  }
  .doc-main { padding: 0 !important; }
  .doc-article { max-width: none; }
  .article-grid { grid-template-columns: 1fr !important; gap: 0 !important; }
  .toc { display: none !important; }

  /* Center the readable text column instead of leaving the former TOC
     track empty on the right edge of the page. */
  .article-content { max-width: 46rem; margin-inline: auto; }

  /* Prose adjustments */
  .prose {
    max-width: none;
    font-size: 11pt;
    line-height: 1.55;
    color: #000;
  }
  .prose p,
  .prose li,
  .prose th,
  .prose td,
  .prose figcaption {
    color: #000 !important;
  }
  .prose h1, .prose h2, .prose h3, .prose h4 { color: #000; page-break-after: avoid; }
  .prose h2 { font-size: 16pt; border-bottom: 1px solid #999; padding-bottom: 0.2rem; }
  .prose h3 { font-size: 13pt; }
  .prose pre, .prose img, .prose table {
    page-break-inside: avoid;
  }
  .prose pre {
    background: #f5f5f5 !important;
    color: #000 !important;
    border: 1px solid #ccc !important;
    box-shadow: none !important;
  }
  .prose pre code {
    color: #000 !important;
    white-space: pre-wrap;
    word-break: break-word;
  }
  .hljs-keyword, .hljs-string, .hljs-number, .hljs-comment,
  .hljs-built_in, .hljs-type, .hljs-attr, .hljs-attribute,
  .hljs-name, .hljs-property, .hljs-title, .hljs-section,
  .hljs-tag, .hljs-literal, .hljs-symbol, .hljs-punctuation,
  .hljs-operator, .hljs-meta, .hljs-quote, .hljs-template-tag,
  .hljs-template-variable, .hljs-variable, .hljs-params,
  .hljs-bullet, .hljs-regexp, .hljs-deletion, .hljs-addition {
    color: #000 !important;
    background: transparent !important;
  }
  .hljs-comment, .hljs-quote, .hljs-meta { color: #555 !important; font-style: italic; }

  /* Task-list checkboxes: browsers drop the filled background in print
     (economy mode), collapsing checked and unchecked into identical empty
     boxes. Draw a dark check on a white box and force the mark to print so the
     two states stay distinguishable (and stay grayscale for ink-frugal print). */
  .prose .task-list-item-checkbox,
  .prose .task-list-item-checkbox:checked {
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
    background: #ffffff !important;
    border-color: #000000 !important;
  }
  .prose .task-list-item-checkbox:checked::after {
    border-color: #000000 !important;
  }

  /* Reset the brand accent (terracotta) to grayscale in print so links and
     inline code match the rest of the ink-frugal page. Links stay identifiable
     by their underline and the printed URL footnote below. */
  .prose a { color: #000 !important; }
  .prose code:not(pre code) { color: #000 !important; }
  .prose blockquote { border-left-color: #999 !important; }

  /* Code language label: the screen colors assume a dark code surface and are
     near-invisible on the light print background. Use dark-on-light instead. */
  .prose pre[class*="language-"]::before {
    color: #555 !important;
    background: #fff !important;
    border-color: #ccc !important;
  }

  /* External link footnoting */
  .prose a[href^="http"]::after,
  .prose a[href^="https"]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
    word-break: break-all;
  }
  .prose a[href^="#"]::after { content: ""; }

  /* Avoid orphan page breaks */
  p, li { orphans: 3; widows: 3; }

  /* Page meta footer keeps the source link in print */
  .page-meta { border-top: 1px solid #ccc; margin-top: 2rem; padding-top: 1rem; }
  .page-meta__link { color: #000 !important; }
  .page-meta__link svg { display: none; }
}