:root {
  --primary: hsl(215 100% 50%);
  --primary-dark: hsl(215 100% 42%);
  --primary-light: hsl(215 90% 96%);
  --primary-ring: hsl(215 100% 50% / 0.28);
  --fg: hsl(24 10% 12%);
  --fg-soft: hsl(30 4% 44%);
  --bg: hsl(48 8% 96%);
  --surface: hsl(48 7% 94%);
  --surface-2: hsl(48 6% 90%);
  --border: hsl(36 8% 88%);
  --border-light: hsl(40 8% 91%);
  --card: hsl(0 0% 100%);
  --code-bg: #0d1117;
  --code-fg: #e6edf7;
  --code-border: rgba(255, 255, 255, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.05);
  --shadow-md: 0 6px 16px -6px rgb(0 0 0 / 0.12);
  --shadow-lg: 0 24px 60px rgb(0 0 0 / 0.16);
  --nav-bg: hsl(48 8% 96% / 0.82);
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: hsl(215 100% 62%);
    --primary-dark: hsl(215 100% 70%);
    --primary-light: hsl(215 30% 18%);
    --primary-ring: hsl(215 100% 62% / 0.32);
    --fg: hsl(0 0% 95%);
    --fg-soft: hsl(0 0% 62%);
    --bg: hsl(0 0% 7%);
    --surface: hsl(0 0% 13%);
    --surface-2: hsl(0 0% 16%);
    --border: hsl(0 0% 17%);
    --border-light: hsl(0 0% 14%);
    --card: hsl(0 0% 10%);
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
    --shadow-md: 0 8px 24px rgb(0 0 0 / 0.45);
    --shadow-lg: 0 24px 60px rgb(0 0 0 / 0.6);
    --nav-bg: hsl(0 0% 7% / 0.78);
    color-scheme: dark;
  }
}

[data-theme="light"] {
  --primary: hsl(215 100% 50%);
  --primary-dark: hsl(215 100% 42%);
  --primary-light: hsl(215 90% 96%);
  --primary-ring: hsl(215 100% 50% / 0.28);
  --fg: hsl(24 10% 12%);
  --fg-soft: hsl(30 4% 44%);
  --bg: hsl(48 8% 96%);
  --surface: hsl(48 7% 94%);
  --surface-2: hsl(48 6% 90%);
  --border: hsl(36 8% 88%);
  --border-light: hsl(40 8% 91%);
  --card: hsl(0 0% 100%);
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.05);
  --shadow-md: 0 6px 16px -6px rgb(0 0 0 / 0.12);
  --shadow-lg: 0 24px 60px rgb(0 0 0 / 0.16);
  --nav-bg: hsl(48 8% 96% / 0.82);
  color-scheme: light;
}

[data-theme="dark"] {
  --primary: hsl(215 100% 62%);
  --primary-dark: hsl(215 100% 70%);
  --primary-light: hsl(215 30% 18%);
  --primary-ring: hsl(215 100% 62% / 0.32);
  --fg: hsl(0 0% 95%);
  --fg-soft: hsl(0 0% 62%);
  --bg: hsl(0 0% 7%);
  --surface: hsl(0 0% 13%);
  --surface-2: hsl(0 0% 16%);
  --border: hsl(0 0% 17%);
  --border-light: hsl(0 0% 14%);
  --card: hsl(0 0% 10%);
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-md: 0 8px 24px rgb(0 0 0 / 0.45);
  --shadow-lg: 0 24px 60px rgb(0 0 0 / 0.6);
  --nav-bg: hsl(0 0% 7% / 0.78);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .2s ease, color .2s ease;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); text-decoration: underline; }
img, svg { max-width: 100%; vertical-align: middle; }
::selection { background: var(--primary-ring); color: var(--fg); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

/* ── Navbar ───────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--nav-bg);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border-light);
}
.nav-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }
.brand .dot { color: var(--primary); }
.brand-icon {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 8px;
  transition: transform .15s ease;
}
.brand:hover .brand-icon { transform: scale(1.06) rotate(-3deg); }
.brand-text { white-space: nowrap; }
.brand-sub {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  margin-left: 4px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--fg-soft);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color .12s ease, background-color .12s ease;
}
.nav-links a:hover { color: var(--fg); background: var(--surface); text-decoration: none; }
.nav-links a.active { color: var(--primary); background: var(--primary-light); }
.nav-links a.btn-primary, .nav-links a.btn-primary:hover { color: #fff; }
.nav-links a.btn-outline { color: var(--fg); }
.nav-links a.btn-outline:hover { color: var(--primary); background: transparent; }

.btn-primary, .btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; text-decoration: none; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.btn-sm { padding: 7px 13px; font-size: 13px; }

/* ── Nav tools (search + theme), injected by site.js ─ */
.nav-tools { display: inline-flex; align-items: center; gap: 8px; }
.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 10px 0 12px;
  min-width: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--fg-soft);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color .12s ease, background-color .12s ease;
}
.search-trigger:hover { border-color: var(--primary); color: var(--fg); }
.search-trigger svg { width: 16px; height: 16px; flex-shrink: 0; }
.search-trigger .st-label { flex: 1; text-align: left; white-space: nowrap; }
.search-trigger .kbd { margin-left: auto; white-space: nowrap; }
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg-soft);
  cursor: pointer;
  transition: color .12s ease, border-color .12s ease, background-color .12s ease;
}
.icon-btn:hover { color: var(--fg); border-color: var(--primary); }
.icon-btn svg { width: 17px; height: 17px; }
.theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: inline; }
  [data-theme="dark"] .theme-toggle .sun { display: none; }
}

/* ── Hero ─────────────────────────────────────────── */
.hero {
  padding: 88px 24px 60px;
  text-align: center;
  position: relative;
  background:
    radial-gradient(900px 420px at 50% -10%, var(--primary-light), transparent 62%),
    var(--bg);
}
.hero .badge {
  display: inline-block;
  padding: 6px 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  border: 1px solid var(--primary-ring);
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
}
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.08;
  color: var(--fg);
}
.hero .grad {
  background: linear-gradient(120deg, var(--primary), #7aa9ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p.lede {
  font-size: 18px;
  color: var(--fg-soft);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero .actions { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ── Layout ───────────────────────────────────────── */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}
.layout {
  display: grid;
  grid-template-columns: 248px 1fr;
  gap: 48px;
  max-width: 1240px;
  margin: 36px auto;
  padding: 0 24px 96px;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 16px; padding-top: 12px; }
}
.sidebar {
  align-self: start;
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  border-right: 1px solid var(--border-light);
  padding-right: 16px;
}
@media (max-width: 900px) {
  .sidebar { position: static; max-height: none; overflow: visible; border-right: none; padding-right: 0; padding-bottom: 10px; border-bottom: 1px solid var(--border-light); }
}
.sidebar h4 {
  margin: 22px 0 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--fg-soft);
  font-weight: 600;
}
.sidebar h4:first-child { margin-top: 0; }
.sidebar a {
  display: block;
  padding: 7px 11px;
  font-size: 14px;
  color: var(--fg-soft);
  border-radius: 7px;
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: color .12s ease, background-color .12s ease;
}
.sidebar a:hover { background: var(--surface); color: var(--fg); text-decoration: none; }
.sidebar a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.sidebar a.scroll-active { color: var(--primary); border-left-color: var(--primary); }

/* ── Content ──────────────────────────────────────── */
.content { min-width: 0; max-width: 820px; }
.content h1 { font-size: 38px; line-height: 1.12; margin: 0 0 10px; font-weight: 700; letter-spacing: -.02em; }
.content h2 { font-size: 23px; margin: 44px 0 14px; font-weight: 700; padding-top: 16px; border-top: 1px solid var(--border-light); letter-spacing: -.01em; scroll-margin-top: 88px; }
.content h2:first-of-type { border-top: 0; padding-top: 0; }
.content h3 { font-size: 17px; margin: 30px 0 10px; font-weight: 600; scroll-margin-top: 88px; }
.content p { margin: 0 0 14px; color: var(--fg); }
.content p.lede { font-size: 18px; color: var(--fg-soft); margin-bottom: 26px; line-height: 1.6; }
.content ul, .content ol { padding-left: 22px; margin: 0 0 16px; }
.content li { margin: 7px 0; }
.content li::marker { color: var(--fg-soft); }
.content a { font-weight: 500; }
.content code { font-family: var(--font-mono); font-size: 13px; background: var(--surface-2); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--border-light); }
.content pre { background: var(--code-bg); color: var(--code-fg); padding: 16px 18px; border-radius: var(--radius); overflow-x: auto; margin: 0 0 18px; font-family: var(--font-mono); font-size: 13px; line-height: 1.6; border: 1px solid var(--code-border); }
.content pre code { background: transparent; padding: 0; border: 0; color: inherit; font-size: 13px; }
.content blockquote { margin: 0 0 16px; padding: 12px 16px; border-left: 3px solid var(--primary); background: var(--primary-light); color: var(--fg); border-radius: 0 8px 8px 0; }
.content table { border-collapse: separate; border-spacing: 0; width: 100%; margin: 0 0 18px; font-size: 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.content th, .content td { padding: 11px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.content tr:last-child td { border-bottom: 0; }
.content th { background: var(--surface); font-weight: 600; }

/* ── Code block copy button (wrapper from site.js) ── */
.code-wrap { position: relative; }
.code-wrap pre { margin: 0 0 18px; }
.copy-btn {
  position: absolute;
  top: 9px;
  right: 9px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font);
  color: var(--code-fg);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .12s ease, background-color .12s ease;
}
.code-wrap:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: rgba(255, 255, 255, 0.16); }
.copy-btn.copied { color: #6ee7a8; }
.copy-btn svg { width: 13px; height: 13px; }

/* ── Cards ────────────────────────────────────────── */
.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(248px, 1fr));
  margin: 24px 0;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); text-decoration: none; transform: translateY(-3px); }
.card .icon {
  width: 42px; height: 42px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 20px;
  background: var(--primary-light); color: var(--primary);
  border-radius: 10px;
}
.card h3 { margin: 6px 0 0; font-size: 16px; font-weight: 600; color: var(--fg); }
.card p { margin: 0; color: var(--fg-soft); font-size: 14px; }

/* ── Callouts ─────────────────────────────────────── */
.callout {
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: 8px;
  background: var(--surface);
  font-size: 14px;
}
.callout strong { color: var(--fg); }
.callout.info    { border-left-color: var(--primary); background: var(--primary-light); }
.callout.warn    { border-left-color: #d9930a; background: color-mix(in srgb, #f5a623 14%, var(--bg)); }
.callout.danger  { border-left-color: #dc2626; background: color-mix(in srgb, #dc2626 12%, var(--bg)); }
.callout.success { border-left-color: #14aa51; background: color-mix(in srgb, #14aa51 12%, var(--bg)); }

/* ── Footer ───────────────────────────────────────── */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border-light);
  padding: 48px 24px 28px;
  color: var(--fg-soft);
  font-size: 14px;
}
.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 720px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
.footer h5 { color: var(--fg); font-size: 13px; font-weight: 600; margin: 0 0 10px; text-transform: uppercase; letter-spacing: .06em; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin: 5px 0; }
.footer a { color: var(--fg-soft); }
.footer a:hover { color: var(--primary); text-decoration: none; }
.footer-bottom {
  max-width: 1240px;
  margin: 32px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ── Mobile nav ───────────────────────────────────── */
.nav-toggle { display: none; background: none; border: 0; padding: 6px; color: var(--fg); cursor: pointer; font-size: 20px; line-height: 1; }
@media (max-width: 860px) {
  .search-trigger { min-width: 0; }
  .search-trigger .st-label, .search-trigger .kbd { display: none; }
  .search-trigger { width: 36px; padding: 0; justify-content: center; }
}
@media (max-width: 800px) {
  .nav-inner { gap: 10px; }
  .nav-toggle { display: inline-flex; order: 3; }
  .nav-tools { order: 2; margin-left: auto; }
  .brand { order: 0; }
  .nav-links { display: none; order: 4; width: 100%; flex-direction: column; align-items: stretch; gap: 4px; padding-top: 8px; margin-left: 0; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 14px; }
  .btn-primary.nav-cta, .btn-outline.btn-sm { align-self: flex-start; }
}

/* ── Search modal ─────────────────────────────────── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(8, 14, 22, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .14s ease;
}
.search-overlay.open { opacity: 1; pointer-events: auto; }
.search-box {
  width: 100%;
  max-width: 600px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-8px);
  transition: transform .14s ease;
}
.search-overlay.open .search-box { transform: translateY(0); }
.search-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
}
.search-head svg { width: 18px; height: 18px; color: var(--fg-soft); flex-shrink: 0; }
.search-input {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--fg);
  font-family: inherit;
  font-size: 16px;
  outline: none;
}
.search-input::placeholder { color: var(--fg-soft); }
.search-results { max-height: 56vh; overflow-y: auto; padding: 8px; }
.search-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--fg);
}
.search-item:hover, .search-item.active { background: var(--surface); text-decoration: none; }
.search-item.active { box-shadow: inset 0 0 0 1px var(--primary-ring); }
.search-item .si-icon { font-size: 17px; width: 24px; text-align: center; flex-shrink: 0; }
.search-item .si-title { font-weight: 600; font-size: 14px; }
.search-item .si-sub { font-size: 12px; color: var(--fg-soft); margin-top: 1px; }
.search-empty { padding: 28px 16px; text-align: center; color: var(--fg-soft); font-size: 14px; }
.search-foot {
  display: flex;
  gap: 16px;
  padding: 10px 16px;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--fg-soft);
}
.search-foot span { display: inline-flex; align-items: center; gap: 5px; }

/* ── Back to top ──────────────────────────────────── */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}
.to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.to-top:hover { border-color: var(--primary); color: var(--primary); }
.to-top svg { width: 18px; height: 18px; }

/* ── Misc ─────────────────────────────────────────── */
.kbd { font-family: var(--font-mono); font-size: 11px; padding: 2px 6px; background: var(--card); border: 1px solid var(--border); border-radius: 5px; color: var(--fg-soft); }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-family: var(--font-mono); font-size: 12px; padding: 3px 9px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-pill); color: var(--fg-soft); }
.tag.primary { background: var(--primary-light); color: var(--primary); border-color: var(--primary-ring); }

hr { border: 0; border-top: 1px solid var(--border-light); margin: 28px 0; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}