/* Design mirrored from the Stirling portal "Developer docs" surface
   (frontend/editor/src/portal/views/DeveloperDocs.css) with its token values
   inlined, since this site has no runtime theme system. */

:root {
  --c-bg: #f5f4f1;
  --c-bg-raised: #ffffff;
  --c-surface: #fafafa;
  --c-bg-subtle: #f3f4f6;
  --c-hover: #f9fafb;
  --c-text: #373530;
  --c-text-muted: #4b5563;
  --c-text-subtle: #646b76;
  --c-border: #f0f0f0;
  --c-border-subtle: #e5e7eb;
  --c-primary: #3b82f6;
  --c-primary-hover: #2563eb;
  --c-brand: #af3434;
  --c-success: #16a34a;
  --c-danger: #dc2626;
  --c-warning: #d97706;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;
  --motion-fast: 0.15s ease;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --navbar-h: 4.625rem;
}

[data-theme="dark"] {
  --c-bg: #141416;
  --c-bg-raised: #131315;
  --c-surface: #1a1a1d;
  --c-bg-subtle: #1f1f23;
  --c-hover: #1f2937;
  --c-text: #fafafa;
  --c-text-muted: #a1a1aa;
  --c-text-subtle: #8b8b94;
  --c-border: #28282d;
  --c-border-subtle: rgba(255, 255, 255, 0.07);
  --c-primary: #3b82f6;
  --c-primary-hover: #1d4ed8;
  --c-danger: #ef4444;
  --c-warning: #f59e0b;
  --c-success: #22c55e;
}

* { box-sizing: border-box; }

/* Theme-aware scrollbars (page + sidebar/toc rails) */
:root { --scrollbar-thumb: #d1d5db; --scrollbar-thumb-hover: #9ca3af; }
[data-theme="dark"] { --scrollbar-thumb: #3f3f46; --scrollbar-thumb-hover: #52525b; }
html { scrollbar-color: var(--scrollbar-thumb) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 5px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background-color: var(--scrollbar-thumb-hover); background-clip: content-box; }

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--c-bg-raised);
  color: var(--c-text);
  border-radius: var(--radius-md);
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.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;
}

/* Navigation progress bar - only appears if a swap takes over ~150ms. */
.nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: 60;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: 0 50%;
  opacity: 0;
  pointer-events: none;
}
.nav-progress.active {
  opacity: 1;
  animation: nav-progress-grow 1.4s ease-out forwards;
}
@keyframes nav-progress-grow {
  0% { transform: scaleX(0); }
  60% { transform: scaleX(0.75); }
  100% { transform: scaleX(0.92); }
}

/* Focused headings after a navigation shouldn't show a focus ring. */
.doc h1:focus { outline: none; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 16px;
  /* Matches stirling.com's text rendering (thinner, crisper on dark). */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Navbar — mirrors the stirling.com site header (light, translucent) ──── */

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--navbar-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: rgba(0, 0, 0, 0.06) 0 1px 0 0;
  font-family: "Inter", var(--font-sans);
}
/* Dark theme keeps the same shape, inverted. */
[data-theme="dark"] .navbar {
  background: rgba(20, 20, 22, 0.95);
  box-shadow: rgba(255, 255, 255, 0.08) 0 1px 0 0;
}

.navbar-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 100%;
  max-width: 77.5rem;
  margin: 0 auto;
  padding: 0 20px;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  background: none;
  color: var(--c-text);
  cursor: pointer;
  border-radius: var(--radius-md);
}
.menu-toggle:hover { background: var(--c-hover); }

.brand {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: #121212;
  white-space: nowrap;
}
[data-theme="dark"] .brand { color: #fafafa; }
.brand img { display: block; height: 29px; width: auto; }
.brand-name {
  font-family: "Alumni Sans", var(--font-sans);
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1;
}

.navbar-center {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: 1.5rem;
}
.navbar-center > a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #121212;
  text-decoration: none;
  transition: opacity var(--motion-fast);
}
[data-theme="dark"] .navbar-center > a { color: #fafafa; }
.navbar-center > a:hover { opacity: 0.65; }
.navbar-center > a.active { opacity: 0.55; }

/* Dropdown menus (Product / Company) - panel metrics measured off
   stirling.com: 324px wide, 24px radius, 16px padding, hairline + soft shadow,
   centred under the trigger. Rows are 58px with a title and description. */
.nav-item { position: relative; display: flex; align-items: center; }

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #121212;
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--motion-fast);
}
[data-theme="dark"] .nav-trigger { color: #fafafa; }
.nav-trigger:hover { opacity: 0.65; }
.nav-caret { transition: transform var(--motion-fast); }
.nav-item.open .nav-caret { transform: rotate(180deg); }

.nav-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 324px;
  display: none;
  flex-direction: column;
  padding: 16px;
  margin-top: 12px;
  background: #fff;
  border-radius: 24px;
  box-shadow: rgba(0, 0, 0, 0.04) 0 0 0 1px, rgba(0, 0, 0, 0.04) 0 2px 20px 0;
  z-index: 60;
}
/* Invisible bridge so the menu survives the gap under the trigger. */
.nav-menu::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}
[data-theme="dark"] .nav-menu {
  background: #1a1a1d;
  box-shadow: rgba(255, 255, 255, 0.08) 0 0 0 1px, rgba(0, 0, 0, 0.5) 0 2px 20px 0;
}
.nav-item:hover .nav-menu,
.nav-item:focus-within .nav-menu,
.nav-item.open .nav-menu { display: flex; }

.nav-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 58px;
  padding: 0 8px;
  border-radius: 14px;
  text-decoration: none;
}
/* Hover lifts the row into a card with the same 1px hairline ring the panel
   itself uses, rather than a grey fill. */
.nav-menu-item { transition: box-shadow var(--motion-fast), background var(--motion-fast); }
/* Row text must not inherit the top-level link fade. */
.nav-menu-item:hover { opacity: 1; }
.nav-menu-item:hover {
  background: #f4f4f5;
  box-shadow: rgba(0, 0, 0, 0.05) 0 0 0 1px;
}
[data-theme="dark"] .nav-menu-item:hover {
  background: rgba(255, 255, 255, 0.07);
  box-shadow: rgba(255, 255, 255, 0.1) 0 0 0 1px;
}
/* Keyboard users get a stronger, unambiguous ring - the hover hairline is too
   faint to serve as a focus indicator on its own. */
.nav-menu-item:focus-visible,
.nav-trigger:focus-visible,
.navbar-center a:focus-visible,
.navbar-login:focus-visible,
.navbar-cta:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: 14px;
}
.nav-menu-item:focus-visible { outline-offset: -1px; }

.nav-menu-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #f4f4f5;
  box-shadow: rgba(0, 0, 0, 0.05) 0 0 0 1px;
  /* Glyphs are near-black like stirling.com, not grey. */
  color: #121212;
}
[data-theme="dark"] .nav-menu-icon {
  background: rgba(255, 255, 255, 0.08);
  box-shadow: rgba(255, 255, 255, 0.08) 0 0 0 1px;
  color: #fafafa;
}

.nav-menu-text { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.nav-menu-title { font-size: 0.9375rem; font-weight: 500; color: #121212; }
[data-theme="dark"] .nav-menu-title { color: #fafafa; }
.nav-menu-desc { font-size: 0.8125rem; font-weight: 500; color: #525252; }
[data-theme="dark"] .nav-menu-desc { color: #a1a1aa; }

.navbar-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.ask-ai {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #121212;
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--motion-fast);
}
[data-theme="dark"] .ask-ai { color: #fafafa; }
.ask-ai:hover { opacity: 0.65; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  color: #525252;
  background: none;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: color var(--motion-fast), background var(--motion-fast);
}
.theme-toggle:hover { color: #121212; background: rgba(0, 0, 0, 0.05); }
[data-theme="dark"] .theme-toggle { color: #a1a1aa; }
[data-theme="dark"] .theme-toggle:hover { color: #fff; background: rgba(255, 255, 255, 0.1); }

.icon-moon { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: none; }

.gh-star {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #121212;
  text-decoration: none;
}
[data-theme="dark"] .gh-star { color: #fafafa; }
.gh-star-count {
  font-family: "Geist", var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: #525252;
  transition: color var(--motion-fast);
}
[data-theme="dark"] .gh-star-count { color: #a1a1aa; }
.gh-star:hover .gh-star-count { color: #121212; }
[data-theme="dark"] .gh-star:hover .gh-star-count { color: #fff; }

/* Log in: ghost pill. Sign up: solid dark pill. */
.navbar-login,
.navbar-cta {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 20px;
  border-radius: 64px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--motion-fast), opacity var(--motion-fast);
}

.navbar-login {
  color: #262626;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.1);
}
.navbar-login:hover { background: #f5f5f5; }
[data-theme="dark"] .navbar-login {
  color: #e5e5e5;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.18);
}
[data-theme="dark"] .navbar-login:hover { background: rgba(255, 255, 255, 0.08); }

.navbar-cta {
  color: #fff;
  background: #121212;
}
.navbar-cta:hover { opacity: 0.85; }
[data-theme="dark"] .navbar-cta { color: #121212; background: #fafafa; }

/* ── Layout: sidebar / content / toc ─────────────────────────────────────── */

.layout {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr) 15rem;
  max-width: 100rem;
  margin: 0 auto;
}
/* Align the sidebar edge with the navbar brand on wide screens. */
@media (min-width: 90rem) {
  .layout { padding: 0 60px; }
}

/* ── Left nav ────────────────────────────────────────────────────────────── */

.sidebar {
  position: sticky;
  top: var(--navbar-h);
  height: calc(100vh - var(--navbar-h));
  overflow-y: auto;
  border-right: 1px solid var(--c-border-subtle);
  padding: 1.25rem 0 2rem;
  scrollbar-width: thin;
}

.sidebar-search { padding: 0 0.75rem 0.75rem; }

.sidebar-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.0625rem;
}

.side-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.35rem 0.75rem 0.35rem 1rem;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--c-text-subtle);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: background var(--motion-fast), color var(--motion-fast);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.side-link:hover { background: var(--c-hover); color: var(--c-text); }
.side-link.active {
  background: color-mix(in srgb, var(--c-primary) 12%, var(--c-surface));
  color: var(--c-primary);
  font-weight: 600;
}

/* Category header row: label + caret */
.side-category { margin-top: 0.4rem; }
.side-category-row { display: flex; align-items: stretch; }
.side-cat-label {
  flex: 1;
  min-width: 0;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-subtle);
  padding: 0.4rem 0.25rem 0.4rem 1rem;
}
.side-cat-label:hover { color: var(--c-text-muted); }
.side-cat-label.active { color: var(--c-primary); background: none; }

.side-caret {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  border: none;
  background: none;
  color: var(--c-text-subtle);
  cursor: pointer;
}
.side-caret svg { transition: transform var(--motion-fast); }
.side-category.open > .side-category-row .side-caret svg { transform: rotate(90deg); }

/* Nested items: indented with a guide line */
.side-sub {
  display: none !important;
  margin: 0.125rem 0 0.25rem 1.1rem !important;
  padding-left: 0.4rem !important;
  border-left: 1px solid var(--c-border-subtle);
}
.side-category.open > .side-sub { display: flex !important; }
.side-sub .side-link { padding-left: 0.6rem; }
.side-sub .side-cat-label { padding-left: 0.6rem; }

/* ── Content ─────────────────────────────────────────────────────────────── */

/* Body is navbar / layout / footer stacked; layout grows so the footer
   sits at the bottom even on short pages. */
body { display: flex; flex-direction: column; min-height: 100vh; }
.layout { flex: 1; width: 100%; }

.content {
  min-width: 0;
  padding: 2rem 2.5rem 3rem;
  display: flex;
  flex-direction: column;
}

.doc {
  width: 100%;
  max-width: 46rem;
  margin: 0 auto;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--c-text-muted);
  flex: 1;
}

.doc-title,
.doc h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-text);
  margin: 0 0 1rem;
}

.doc h2,
.doc h3,
.doc h4 {
  color: var(--c-text);
  font-weight: 650;
  line-height: 1.25;
  margin: 1.75rem 0 0.75rem;
  scroll-margin-top: calc(var(--navbar-h) + 1rem);
}
.doc h2 {
  font-size: 1.3125rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--c-border-subtle);
}
.doc h3 { font-size: 1.0625rem; }
.doc h4 { font-size: 0.9375rem; }
.doc > :first-child { margin-top: 0; }

.anchor-heading .anchor-link {
  margin-left: 0.4rem;
  color: var(--c-text-subtle);
  opacity: 0;
  text-decoration: none;
  font-weight: 400;
  transition: opacity var(--motion-fast);
}
.anchor-heading:hover .anchor-link { opacity: 1; }
.anchor-link:hover { color: var(--c-primary); }

.doc p, .doc ul, .doc ol { margin: 0 0 0.875rem; }
.doc li { margin: 0.25rem 0; }
.doc li > p { margin-bottom: 0.25rem; }

.doc a { color: var(--c-primary); text-decoration: none; }
.doc a:hover { text-decoration: underline; }

.doc code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--c-bg-subtle);
  border: 1px solid var(--c-border-subtle);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
}

.doc blockquote {
  margin: 0 0 0.875rem;
  padding: 0.125rem 0.875rem;
  border-left: 3px solid var(--c-primary);
  background: var(--c-bg-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--c-text-subtle);
}
.doc blockquote p { margin: 0.5rem 0; }
/* Headings inside callout boxes: no section-sized margins or rules. */
.doc blockquote h2, .doc blockquote h3, .doc blockquote h4,
.doc .admonition h2, .doc .admonition h3, .doc .admonition h4 {
  margin: 0.5rem 0 0.25rem;
  font-size: 0.9375rem;
  border-bottom: none;
  padding-bottom: 0;
}

.doc img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-border-subtle);
}

.doc hr {
  border: none;
  border-top: 1px solid var(--c-border-subtle);
  margin: 1.5rem 0;
}
/* Docs often write "---" right before "## Heading"; the h2 already draws its
   own hairline, so drop the hr to avoid double divider lines. */
.doc hr:has(+ h2),
.doc > hr:first-child { display: none; }

.doc table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.8125rem;
  margin: 0 0 0.875rem;
  display: block;
  overflow-x: auto;
}
.doc th, .doc td {
  border: 1px solid var(--c-border-subtle);
  padding: 0.4rem 0.625rem;
  text-align: left;
  vertical-align: top;
}
.doc th { background: var(--c-bg-subtle); font-weight: 600; }

.doc details {
  margin: 0 0 0.875rem;
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.875rem;
  background: var(--c-surface);
}
.doc summary { cursor: pointer; font-weight: 600; color: var(--c-text); }

/* ── Code blocks ─────────────────────────────────────────────────────────── */

.codeblock {
  position: relative;
  margin: 0 0 0.875rem;
}

.codeblock-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-text-subtle);
  background: var(--c-bg-subtle);
  border: 1px solid var(--c-border-subtle);
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  padding: 0.4rem 0.875rem;
}
.codeblock-title + button + .shiki,
.codeblock-title ~ pre.shiki { border-radius: 0 0 var(--radius-md) var(--radius-md); }

.codeblock pre.shiki {
  margin: 0;
  padding: 0.875rem 4rem 0.875rem 0.875rem;
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.5;
  background: var(--c-bg-subtle) !important;
}
.codeblock pre.shiki code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  font-family: var(--font-mono);
}

/* Shiki dual themes: swap CSS variables in dark mode */
[data-theme="dark"] .codeblock pre.shiki,
[data-theme="dark"] .codeblock pre.shiki span {
  color: var(--shiki-dark) !important;
}

.codeblock-lang {
  position: absolute;
  top: 0.45rem;
  right: 2.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--c-text-subtle);
  user-select: none;
  pointer-events: none;
}
.codeblock-title ~ .codeblock-lang { display: none; }

.codeblock-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  color: var(--c-text-subtle);
  background: var(--c-surface);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--motion-fast), color var(--motion-fast);
  z-index: 1;
}
.codeblock:hover .codeblock-copy,
.codeblock-copy:focus-visible { opacity: 1; }
/* Touch devices have no hover: keep the button visible. */
@media (hover: none) { .codeblock-copy { opacity: 1; } }
.codeblock-copy:hover { color: var(--c-text); }
.codeblock-copy.copied { color: var(--c-success); opacity: 1; }
.codeblock-title ~ .codeblock-copy { top: 2.6rem; }

/* ── Admonitions ─────────────────────────────────────────────────────────── */

/* Portal-style callout: neutral subtle surface, type-coloured left bar only. */
.admonition {
  --adm-color: var(--c-text-subtle);
  margin: 0 0 0.875rem;
  padding: 0.75rem 0.875rem;
  border-left: 3px solid var(--adm-color);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--c-bg-subtle);
  font-size: 0.875rem;
}
.admonition-note { --adm-color: var(--c-text-subtle); }
.admonition-info { --adm-color: var(--c-primary); }
.admonition-tip { --adm-color: var(--c-success); }
.admonition-warning, .admonition-caution { --adm-color: var(--c-warning); }
.admonition-danger { --adm-color: var(--c-danger); }

.admonition-heading {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--adm-color);
  margin-bottom: 0.375rem;
}
.admonition-content > :last-child { margin-bottom: 0; }
.admonition-content > :first-child { margin-top: 0; }

/* ── Tabs ────────────────────────────────────────────────────────────────── */

.tabs { margin: 0 0 0.875rem; }

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  border-bottom: 1px solid var(--c-border-subtle);
  margin-bottom: 0.75rem;
}

.tab-btn {
  padding: 0.4rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-subtle);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color var(--motion-fast);
}
.tab-btn:hover { color: var(--c-text); }
.tab-btn.active {
  color: var(--c-primary);
  font-weight: 600;
  border-bottom-color: var(--c-primary);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }
.tab-panel > :last-child { margin-bottom: 0; }

/* ── ToC (right rail) ────────────────────────────────────────────────────── */

.toc {
  position: sticky;
  top: var(--navbar-h);
  height: calc(100vh - var(--navbar-h));
  overflow-y: auto;
  padding: 1.5rem 0.75rem;
  scrollbar-width: thin;
}

.toc-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-subtle);
  padding: 0 0.5rem 0.5rem;
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.0625rem;
}

.toc a {
  display: block;
  padding: 0.25rem 0.5rem;
  border-left: 2px solid transparent;
  font-size: 0.8125rem;
  line-height: 1.35;
  color: var(--c-text-subtle);
  text-decoration: none;
  transition: color var(--motion-fast);
}
.toc-l3 a { padding-left: 1.25rem; font-size: 0.75rem; }
.toc a:hover { color: var(--c-text); }
.toc a.active {
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  font-weight: 600;
}

/* ── Edit-this-page footer link (portal "view source" style) ─────────────── */

.doc-source {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--c-border-subtle);
  font-size: 0.8125rem;
}
.doc-source a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-text-subtle);
  text-decoration: none;
}
.doc-source a:hover { color: var(--c-primary); text-decoration: underline; }

/* ── Pager ───────────────────────────────────────────────────────────────── */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  max-width: 46rem;
  width: 100%;
  margin: 2.5rem auto 0;
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-lg);
  background: var(--c-surface);
  text-decoration: none;
  transition: border-color var(--motion-fast);
}
.pager-link:hover { border-color: var(--c-primary); }
.pager-next { text-align: right; }
.pager-dir { font-size: 0.75rem; color: var(--c-text-subtle); }
.pager-title { font-size: 0.875rem; font-weight: 600; color: var(--c-primary); }

/* ── Footer — matches the stirling.com site footer (always dark) ─────────── */

.footer {
  margin-top: 4rem;
  background: #000;
  font-family: "Geist", var(--font-sans);
  padding: 40px 0 32px;
}

.footer-inner {
  max-width: 100rem;
  margin: 0 auto;
  padding: 0 20px;
}
@media (min-width: 90rem) {
  .footer-inner { padding: 0 60px; }
}

.footer-main {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2.5rem 4rem;
}

.footer-brand { display: flex; flex-direction: column; gap: 0.625rem; }

.footer-wordmark {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: #fff;
  font-family: "Alumni Sans", "Geist", var(--font-sans);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1;
}

.footer-tagline {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
}

.footer-social { display: flex; align-items: center; gap: 0.875rem; margin-top: 0.375rem; }
.footer-social a {
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--motion-fast);
  display: inline-flex;
}
.footer-social a:hover { color: #fff; }

.footer-cols { display: flex; flex-wrap: wrap; gap: 2.5rem 4.5rem; }

.footer-col { display: flex; flex-direction: column; gap: 0.625rem; min-width: 7rem; }

.footer-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: #fafafa;
  margin-bottom: 0.25rem;
}

.footer-col a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--motion-fast);
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color var(--motion-fast);
}
.footer-legal a:hover { color: #fff; }

.footer-copyright { font-size: 0.875rem; color: rgba(255, 255, 255, 0.6); }

/* ── Algolia DocSearch button restyled as the portal search input ────────── */

/* Restyled as the portal's sidebar search input: magnifier + placeholder,
   left-aligned, no key chips. Ctrl+K still opens it. */
.sidebar-search .DocSearch-Button {
  width: 100%;
  margin: 0;
  padding: 0.4rem 0.6rem;
  justify-content: flex-start;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--c-text-subtle);
  background: var(--c-bg-subtle);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-md);
  transition: border-color var(--motion-fast);
}
.sidebar-search .DocSearch-Button:hover,
.sidebar-search .DocSearch-Button:focus {
  border-color: var(--c-primary);
  box-shadow: none;
  background: var(--c-bg-subtle);
  color: var(--c-text-subtle);
}
.sidebar-search .DocSearch-Button-Container { flex: none; }
.sidebar-search .DocSearch-Search-Icon {
  width: 14px;
  height: 14px;
  color: var(--c-text-subtle) !important;
}
.sidebar-search .DocSearch-Button-Placeholder {
  display: block;
  font-size: 0.8125rem;
  padding: 0 0 0 0.45rem;
}
.sidebar-search .DocSearch-Button-Keys { display: none; }

:root {
  --docsearch-primary-color: var(--c-primary);
  --docsearch-logo-color: var(--c-primary);
}
[data-theme="dark"] {
  --docsearch-modal-background: var(--c-surface);
  --docsearch-footer-background: var(--c-bg-raised);
  --docsearch-hit-background: var(--c-bg-subtle);
  --docsearch-hit-color: var(--c-text-muted);
  --docsearch-text-color: var(--c-text);
  --docsearch-modal-shadow: none;
  --docsearch-footer-shadow: none;
  --docsearch-searchbox-background: var(--c-bg-subtle);
  --docsearch-searchbox-focus-background: var(--c-bg-subtle);
  --docsearch-key-gradient: var(--c-bg-subtle);
  --docsearch-key-shadow: none;
  --docsearch-muted-color: var(--c-text-subtle);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 72rem) {
  .layout { grid-template-columns: 17rem minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 60rem) {
  .layout { grid-template-columns: 1fr; }
  .menu-toggle { display: inline-flex; }

  .sidebar {
    position: fixed;
    top: var(--navbar-h);
    left: 0;
    bottom: 0;
    width: min(20rem, 85vw);
    height: auto;
    background: var(--c-bg-raised);
    border-right: 1px solid var(--c-border-subtle);
    transform: translateX(-102%);
    transition: transform 0.2s ease;
    z-index: 40;
  }
  body.nav-open .sidebar { transform: translateX(0); }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: var(--navbar-h) 0 0 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 30;
  }
  body.nav-open .sidebar-backdrop { display: block; }
  body.nav-open { overflow: hidden; }

  .content { padding: 1.25rem 1.25rem 0; }
}

/* Drop the star chip first so the nav links survive down to ~1024, which is
   where stirling.com still shows them. */
@media (max-width: 75rem) {
  .gh-star { display: none; }
}

@media (max-width: 60rem) {
  .navbar-center,
  .navbar-login { display: none; }
}

/* Keep the Sign up CTA through tablet widths; only drop it on phones. */
@media (max-width: 30rem) {
  .navbar-cta { display: none; }
}

@media (max-width: 40rem) {
  .pager { grid-template-columns: 1fr; }
  .ask-ai span { display: none; }
  .brand-name { display: none; }
}