:root {
  --header-height: 3.6rem;
  --content-max-width: 52rem;
  --bg: #f6f8fb;
  --surface: #eef3fb;
  --surface-2: #f0f4fc;
  --text: #162238;
  --text-muted: #31415d;
  --brand: #0a6b9a;
  --brand-strong: #0f4f79;
  --border: #c4d0e6;
  --focus: #0a6b9a;

  /* syntax highlighting — light (VS Code Light+) */
  --hljs-keyword: #af00db;
  --hljs-string: #a31515;
  --hljs-number: #077a4f;
  --hljs-comment: #008000;
  --hljs-title: #795e26;
  --hljs-builtin: #1e7090;
  --hljs-attr: #001080;
  --hljs-meta: #af00db;
}

:root[data-theme="dark"] {
  --bg: #0d131f;
  --surface: #131f30;
  --surface-2: #1d2a3f;
  --text: #edf3ff;
  --text-muted: #b9c7dd;
  --brand: #5ec0f2;
  --brand-strong: #8bd4ff;
  --border: #2f405a;
  --focus: #5ec0f2;

  /* syntax highlighting — dark (VS Code Dark+) */
  --hljs-keyword: #c586c0;
  --hljs-string: #ce9178;
  --hljs-number: #b5cea8;
  --hljs-comment: #70a058;
  --hljs-title: #dcdcaa;
  --hljs-builtin: #4ec9b0;
  --hljs-attr: #9cdcfe;
  --hljs-meta: #c586c0;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-size: 15px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  color: var(--text);
  padding: 0.75rem;
  border-radius: 0 0 0.5rem 0;
  box-shadow: var(--shadow);
  z-index: 20;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-height);
  background: color-mix(in oklab, var(--bg) 92%, white 8%);
  border-bottom: 1px solid var(--border);
  padding: 0.55rem max(1rem, calc((100% - 88rem) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-brand,
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.site-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 400;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.35s ease, transform 0.35s ease;
  pointer-events: none;
  white-space: nowrap;
}

.site-subtitle.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.menu-button,
.theme-button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 0.5rem;
  padding: 0.45rem 0.7rem;
  font: inherit;
  cursor: pointer;
}

.menu-button {
  display: none;
}

.theme-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem;
}

.search-wrap {
  min-width: 18rem;
}

.search-wrap input {
  width: 100%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 0.5rem;
  padding: 0.5rem 0.7rem;
  font: inherit;
}

.site-shell {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr) 14rem;
  gap: 0 2rem;
  max-width: 88rem;
  margin: 0 auto;
  width: 100%;
  min-width: 0;
}

.left-rail {
  position: sticky;
  top: var(--header-height);
  height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  scroll-padding: 8px 0;
}

.right-rail {
  position: sticky;
  top: var(--header-height);
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  scroll-padding: 8px 0;
}

.left-rail nav {
  padding: 0.4rem 0.5rem 0.75rem;
}

.content {
  position: relative;
  height: auto;
  overflow: visible;
  padding: 1.1rem 0 2.6rem;
  min-width: 0;
}

.content article {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 0.4rem;
  min-width: 0;
}

.content h1 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin-top: 0;
  color: var(--brand-strong);
}

.content h2,
.content h3,
.content h4 {
  scroll-margin-top: 6rem;
  color: var(--text);
}

.content h2 code,
.content h3 code,
.content h4 code {
  color: inherit;
}

.heading-anchor {
  display: inline-flex;
  align-items: center;
  margin-left: 0.4em;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.15s ease;
  vertical-align: middle;
  text-decoration: none;
}

.content h2:hover .heading-anchor,
.content h3:hover .heading-anchor,
.content h4:hover .heading-anchor,
.heading-anchor:focus-visible {
  opacity: 1;
}

.content p,
.content li {
  color: var(--text-muted);
}

.content p a,
.content li a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content p a:hover,
.content li a:hover {
  text-decoration-thickness: 2px;
}

.content hr {
  border: none;
  border-top: 1px solid var(--border);
  opacity: 0.5;
  margin: 1.75rem 0;
}

.content code {
  font-family: ui-monospace, "JetBrains Mono", "Fira Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  font-variant-ligatures: none;
  background: var(--surface-2);
  border-radius: 0.35rem;
  padding: 0.08rem 0.35rem;
  color: var(--text);
  font-size: 0.9em;
}

.content pre {
  padding: 1rem;
  border-radius: 0.5rem;
  overflow: auto;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* reset inline-code styles when code lives inside a block */
.content pre code {
  background: none;
  border-radius: 0;
  padding: 0;
  font-size: inherit;
  color: var(--text);
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  margin: 1.25rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}

.table-wrap table {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
}

.table-wrap th,
.table-wrap td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

.table-wrap thead th {
  background: color-mix(in oklab, var(--surface-2) 90%, white 10%);
  color: var(--text);
}

.table-wrap tbody tr:last-child td {
  border-bottom: 0;
}

.table-wrap :is(code, a) {
  overflow-wrap: anywhere;
}

/* ── syntax highlighting ─────────────────────────────────────── */
.hljs-keyword,
.hljs-selector-tag,
.hljs-tag { color: var(--hljs-keyword); }

.hljs-string,
.hljs-template-literal,
.hljs-template-tag { color: var(--hljs-string); }

.hljs-number,
.hljs-literal { color: var(--hljs-number); }

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

.hljs-title,
.hljs-title.class_,
.hljs-title.function_ { color: var(--hljs-title); }

.hljs-built_in,
.hljs-type { color: var(--hljs-builtin); }

.hljs-attr,
.hljs-attribute,
.hljs-property { color: var(--hljs-attr); }

.hljs-meta,
.hljs-meta .hljs-keyword { color: var(--hljs-meta); }

.hljs-operator,
.hljs-punctuation { color: var(--text-muted); }

.hljs-variable,
.hljs-params { color: var(--text); }

.hljs-subst { color: var(--text); }

.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 600; }

.right-rail {
  background: transparent;
  border: 0;
  padding: 1rem 5px 2rem;
}

.nav-list,
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-item > a {
  display: block;
  padding: 0.18rem 0.5rem;
  border-left: 2px solid transparent;
  border-radius: 0 0.35rem 0.35rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.toc-list a {
  display: block;
  padding: 0.18rem 0.45rem;
  border-radius: 0.3rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.nav-group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: none;
  border-left: 2px solid transparent;
  background: transparent;
  padding: 0.18rem 0.5rem;
  border-radius: 0 0.35rem 0.35rem 0;
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}

.nav-group-title {
  font-weight: 640;
  color: var(--text);
}

.nav-item.is-active > a {
  border-left-color: var(--brand);
  color: var(--text);
}

.nav-item > a:focus-visible,
.nav-group-toggle:focus-visible,
.toc-list a:focus-visible {
  border-radius: 0;
  outline-offset: -2px;
}

.nav-group.has-active-child > .nav-group-toggle {
  transition: border-left-color 0s;
}

.nav-group.has-active-child > .nav-group-toggle[aria-expanded="false"] {
  border-left-color: var(--brand);
  color: var(--text);
  transition: border-left-color 0s 0.25s;
}

.toc-list a.is-active {
  color: var(--brand);
}

.nav-group-wrap > .nav-list {
  margin-left: 0.6rem;
  padding-left: 0.2rem;
}

.nav-group-caret {
  display: block;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.nav-group-toggle[aria-expanded="false"] .nav-group-caret {
  transform: rotate(-90deg);
}

.nav-group-wrap {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.25s ease;
}

.nav-group-wrap.is-collapsed {
  grid-template-rows: 0fr;
}

.nav-group-children {
  overflow: hidden;
  min-height: 0;
}

.toc-wrap {
  position: relative;
}

.toc-wrap h2 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.toc-depth-3 a {
  padding-left: 1rem;
}

.toc-depth-4 a {
  padding-left: 1.65rem;
}

.toc-empty {
  color: var(--text-muted);
  margin: 0;
}

.search-results {
  position: absolute;
  top: 100%;
  margin-top: 0.4rem;
  right: 0;
  left: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  max-height: 55vh;
  overflow: auto;
}

.search-results button {
  width: 100%;
  text-align: left;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 0.55rem 0.75rem;
  cursor: pointer;
  font: inherit;
  line-height: 1.3;
}

.search-result-title {
  display: block;
  font-weight: 500;
}

.search-result-section {
  display: block;
  margin-top: 0.15rem;
  color: var(--text-muted);
  font-size: 0.82em;
}

.search-result-path {
  display: block;
  margin-top: 0.1rem;
  color: var(--text-muted);
  font-size: 0.78em;
  opacity: 0.7;
}

mark.search-match {
  background: none;
  color: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 1px;
}

.search-results button:hover,
.search-results button:focus-visible {
  background: var(--surface-2);
}

.sr-only {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

/* ── scrollbars ─────────────────────────────────────────────── */
:root {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

@media (max-width: 1100px) {
  .site-shell {
    grid-template-columns: 15rem minmax(0, 1fr);
  }

  .right-rail {
    display: none;
  }
}

@media (max-width: 860px) {
  .menu-button {
    display: inline-flex;
  }

  .search-wrap {
    min-width: 0;
    width: 9rem;
  }

  .site-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .left-rail {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    height: auto;
    width: min(90vw, 19rem);
    background: var(--bg);
    border-right: 1px solid var(--border);
    transform: translateX(-110%);
    transition: transform 0.2s ease;
    z-index: 18;
  }

  .left-rail.is-open {
    transform: translateX(0);
  }

  .content {
    position: static;
    height: auto;
    overflow: visible;
    padding: 1rem 0.8rem 2rem;
  }

  .content article {
    padding: 0;
  }

  .table-wrap {
    margin: 1rem 0;
  }

  .table-wrap th,
  .table-wrap td {
    padding: 0.6rem 0.7rem;
  }
}