:root {
  --bg: #fafaf7;
  --fg: #1a1a1a;
  --muted: #6b7280;
  /* Brand palette — derived from cx-logo.svg cobalt #0039BA. */
  --accent: #0039BA;
  --accent-dark: #002A8C;
  --accent-light: #3B66D3;
  --border: #e6e6e0;

  /* Dark code blocks for visual prominence */
  --code-bg: #1f2430;
  --code-fg: #e2e8f0;
  --code-comment: #6b7280;
  --code-keyword: #c4b5fd;
  --code-string: #fde68a;
  --code-border: #2a2f3d;
  --code-label: #9aa3b0;

  --side-bg: #f3f3ec;
  --side-fg: #1a1a1a;
  --side-muted: #6b7280;
  --side-active: #0039BA;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.45;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}

aside.sidebar {
  background: var(--side-bg);
  border-right: 1px solid var(--border);
  padding: 1rem 0.85rem 2rem;
  font-size: 12.5px;
  line-height: 1.4;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

aside.sidebar .brand {
  margin: 0 0 1rem;
  display: block;
  text-decoration: none;
  line-height: 0;
}
aside.sidebar .brand:hover { text-decoration: none; }
aside.sidebar .brand-mark {
  display: block;
  width: 64px;
  height: 64px;
}

aside.sidebar .brand-sub {
  display: block;
  font-size: 11.5px;
  color: var(--side-muted);
  text-decoration: none;
  margin: 0 0 0.8rem;
}
aside.sidebar .brand-sub:hover { color: var(--side-fg); text-decoration: none; }

/* Site search — input under the CX brand, results dropdown that
   overlays the nav groups when active. Idle state is one slim
   input; active state expands to show ranked hits. */
.side-search {
  position: relative;
  margin: 0 0 0.9rem;
}
#side-search-input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 0.32rem 0.55rem;
  font-size: 12.5px;
  font-family: inherit;
  color: var(--side-fg);
  background: var(--side-input-bg, rgba(255,255,255,0.06));
  border: 1px solid var(--side-input-border, rgba(255,255,255,0.10));
  border-radius: 4px;
  outline: none;
  transition: border-color 0.12s ease, background-color 0.12s ease;
}
#side-search-input::placeholder { color: var(--side-muted); }
#side-search-input:focus {
  border-color: var(--accent, #5b8def);
  background: var(--side-input-bg-focus, rgba(255,255,255,0.10));
}
.side-search-results {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
  max-height: 60vh;
  overflow-y: auto;
  background: var(--side-bg);
  border: 1px solid var(--side-input-border, rgba(255,255,255,0.10));
  border-radius: 4px;
  font-size: 12px;
}
.side-search-results li { margin: 0; }
.side-search-hit a {
  display: block;
  padding: 0.42rem 0.55rem;
  color: var(--side-fg);
  text-decoration: none;
  border-bottom: 1px solid var(--side-input-border, rgba(255,255,255,0.06));
}
.side-search-hit:last-child a { border-bottom: 0; }
.side-search-hit a:hover,
.side-search-hit.is-active a {
  background: var(--side-input-bg-focus, rgba(255,255,255,0.08));
  color: var(--side-fg);
  text-decoration: none;
}
.side-search-title {
  display: block;
  font-weight: 500;
  margin-bottom: 0.15rem;
}
.side-search-snip {
  display: block;
  font-size: 11px;
  color: var(--side-muted);
  line-height: 1.35;
}
.side-search-hit mark {
  background: rgba(125, 211, 252, 0.30);
  color: inherit;
  padding: 0 1px;
  border-radius: 2px;
}
.side-search-empty,
.side-search-error {
  padding: 0.5rem 0.6rem;
  color: var(--side-muted);
  font-size: 11.5px;
}
.side-search-error { color: #f87171; }

aside.sidebar section { margin-bottom: 0.9rem; }
aside.sidebar h4 {
  font-size: 10.5px;
  font-weight: 700;
  margin: 0.6rem 0 0.25rem;
  color: var(--side-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
aside.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
aside.sidebar li { margin: 0; }
aside.sidebar a {
  display: block;
  color: var(--side-fg);
  text-decoration: none;
  padding: 0.12rem 0.4rem;
  border-radius: 3px;
  margin-left: -0.4rem;
}
aside.sidebar a:hover {
  background: rgba(0,0,0,0.05);
  text-decoration: none;
}
aside.sidebar a.active {
  background: var(--side-active);
  color: white;
  font-weight: 500;
}

main {
  max-width: 760px;
  padding: 1.5rem 2rem 3rem;
  width: 100%;
}

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 0.35rem;
}

h2 {
  font-size: 1rem;
  margin: 1.1rem 0 0.25rem;
  color: var(--fg);
}

h3 {
  font-size: 0.9rem;
  margin: 0.7rem 0 0.2rem;
  color: var(--fg);
}

main > p:first-of-type {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 0.8rem;
}

p {
  margin: 0.3rem 0;
}

ul, ol {
  margin: 0.3rem 0;
  padding-left: 1.2rem;
}
li { margin: 0.05rem 0; }

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

code {
  font-family: 'JetBrains Mono', 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  background: rgba(31, 36, 48, 0.08);
  padding: 0.08em 0.3em;
  border-radius: 3px;
  color: #2d2f36;
}

pre {
  font-family: 'JetBrains Mono', 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-border);
  border-radius: 5px;
  padding: 1.6rem 0.9rem 0.7rem;
  margin: 0.45rem 0;
  overflow-x: auto;
  position: relative;
  line-height: 1.45;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  color: inherit;
  display: block;
}

.lang-label {
  position: absolute;
  top: 0.4rem;
  left: 0.85rem;
  font-size: 10.5px;
  color: var(--code-label);
  font-family: inherit;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  user-select: none;
}

.copy-btn {
  position: absolute;
  top: 0.3rem;
  right: 0.4rem;
  padding: 0.15rem 0.45rem;
  font-size: 10.5px;
  font-family: inherit;
  color: var(--code-label);
  background: transparent;
  border: 1px solid var(--code-border);
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s ease;
}
pre:hover .copy-btn,
pre:focus-within .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--code-fg); border-color: var(--code-label); }
.copy-btn.copied { color: #34d399; border-color: #34d399; }
.copy-btn.failed { color: #f87171; border-color: #f87171; }

/* Syntax highlighting palette — colours tuned against the dark
   code-bg slate. Subtle: comments muted, strings warm yellow,
   numbers/literals amber/violet, element names and directives in
   cool blue/pink so CX bracket structure reads at a glance. */
.hl-comment   { color: #7a8294; font-style: italic; }
.hl-string    { color: #fbbf77; }
.hl-number    { color: #f59e0b; }
.hl-literal   { color: #c4b5fd; }
.hl-keyword   { color: #f87171; }
.hl-element   { color: #7dd3fc; }
.hl-directive { color: #f9a8d4; }
.hl-sigil     { color: #fcd34d; }
.hl-type      { color: #a5b4fc; }
.hl-attr      { color: #86efac; }
.hl-fn        { color: #93c5fd; }

table {
  border-collapse: collapse;
  margin: 0.6rem 0;
  font-size: 13px;
  line-height: 1.4;
  width: 100%;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.3rem 0.55rem;
  text-align: left;
  vertical-align: top;
}
thead th {
  background: var(--side-bg);
  font-weight: 600;
}
tbody tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.015);
}
td code {
  font-size: 11.5px;
  background: rgba(31, 36, 48, 0.06);
}

@media (max-width: 460px) {
  body { grid-template-columns: 1fr; }
  aside.sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  main { padding: 1rem 1.25rem 2rem; }
}

/* ── Standard-library pages (generated from co-located [fn-doc]) ─────────── */

/* module index on the Standard-library landing */
.module-index {
  list-style: none;
  margin: 0.6rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 0.15rem 1.4rem;
}
.module-index li { margin: 0; line-height: 1.5; }
.module-index a {
  font-family: 'JetBrains Mono', 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 600;
  font-size: 0.9em;
}
.module-index { color: var(--muted); font-size: 0.9rem; }

/* one function entry on a module page */
section.fn {
  border-top: 1px solid var(--border);
  padding-top: 0.55rem;
  margin-top: 0.9rem;
}
section.fn > h3 {
  font-family: 'JetBrains Mono', 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--accent-dark);
  margin: 0 0 0.15rem;
}
p.fn-sig { margin: 0 0 0.4rem; color: var(--muted); font-size: 0.9rem; }
p.fn-sig code { font-size: 0.85em; color: #2d2f36; background: rgba(31,36,48,0.07); }

.example { margin: 0.4rem 0 0.2rem; }

/* the verified expected-output block — a light "result" panel, distinct from
   the dark input-code block, with a → label */
pre.sample-output {
  background: #f1f5f1;
  color: #1d3a24;
  border: 1px solid #d3e3d6;
  border-left: 3px solid #4a9d5b;
  box-shadow: none;
  padding: 1.5rem 0.9rem 0.6rem;
}
pre.sample-output code { color: inherit; }
pre.sample-output::before {
  content: "→ output";
  position: absolute;
  top: 0.4rem;
  left: 0.85rem;
  font-size: 10.5px;
  color: #4a9d5b;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  user-select: none;
}

/* grouped table of contents on the index page */
.toc-groups section { margin-bottom: 0.8rem; }
.toc-groups h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0.8rem 0 0.2rem;
}
.toc-groups ul { list-style: none; padding-left: 0; }