@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@400;500;600&family=Public+Sans:wght@300;400;500;600;700&display=swap");

:root {
  color-scheme: light;

  --bg: #f6f3ec;
  --surface: #fffdfa;
  --surface-muted: #f1ece3;
  --surface-strong: #e7e0d2;
  --ink: #1f2422;
  --ink-2: #57625d;
  --ink-3: #8b948e;
  --rule: rgba(31, 36, 34, 0.10);
  --rule-strong: rgba(31, 36, 34, 0.18);

  --accent: #1c5a68;
  --accent-soft: rgba(28, 90, 104, 0.08);
  --accent-rule: rgba(28, 90, 104, 0.24);

  --good: #2e6a4f;
  --good-soft: rgba(46, 106, 79, 0.08);
  --good-rule: rgba(46, 106, 79, 0.24);

  --warn: #8b6420;
  --warn-soft: rgba(139, 100, 32, 0.10);
  --warn-rule: rgba(139, 100, 32, 0.24);

  --danger: #9a4b4b;
  --danger-soft: rgba(154, 75, 75, 0.08);
  --danger-rule: rgba(154, 75, 75, 0.24);

  --sans: "Public Sans", system-ui, sans-serif;
  --serif: "Source Serif 4", serif;
  --mono: "IBM Plex Mono", monospace;

  --page-width: 56rem;
  --radius-sm: 0.3125rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;

  --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.04);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
canvas,
video {
  display: block;
  max-width: 100%;
}

button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: var(--accent);
  text-underline-offset: 0.14em;
}

a:hover {
  color: #164b56;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

::selection {
  background: rgba(28, 90, 104, 0.16);
}

.page {
  width: min(100%, var(--page-width));
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule-strong);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.topbar a {
  color: var(--ink-2);
  text-decoration: none;
}

.hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5rem;
}

.hero-kicker,
.hero-label {
  margin: 0 0 1rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 12ch;
}

.hero p,
.hero-sub {
  max-width: 40rem;
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.hero-note,
.pill,
.meta,
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: transparent;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-3);
}

.hero-pills,
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.toc {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 2rem 0 3rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}

.toc a,
.toc-item {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.75rem 0.95rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.45;
  transition: background-color 120ms ease, color 120ms ease;
}

.toc a:nth-child(2n),
.toc-item:nth-child(2n) {
  border-right: none;
}

.toc a:nth-last-child(-n + 2),
.toc-item:nth-last-child(-n + 2) {
  border-bottom: none;
}

.toc a:hover,
.toc-item:hover {
  background: var(--surface-muted);
  color: var(--ink);
}

.toc-n,
.toc-num {
  min-width: 1.5rem;
  padding-top: 0.0625rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-3);
}

.section {
  margin-bottom: 4.5rem;
  scroll-margin-top: 2rem;
}

.sec-head,
.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.4rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--rule-strong);
}

.sec-n,
.section-num {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ink-3);
}

h2,
.section h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.25rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
}

h3,
.section h3 {
  margin: 1.5rem 0 0.55rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

p,
li {
  font-size: 0.96875rem;
  line-height: 1.82;
  color: var(--ink-2);
}

p {
  margin: 0 0 0.95rem;
}

p strong,
li strong {
  color: var(--ink);
  font-weight: 600;
}

ul,
ol {
  margin: 0 0 1.1rem 1.3rem;
  padding: 0;
}

blockquote,
.callout {
  margin: 1rem 0 1.35rem;
  padding: 0.85rem 1.05rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--accent-soft);
  color: var(--ink-2);
  font-size: 0.90625rem;
  line-height: 1.75;
}

.callout.good {
  border-left-color: var(--good);
  background: var(--good-soft);
}

.callout.warn,
.callout.amber {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.callout.red,
.callout.danger {
  border-left-color: var(--danger);
  background: var(--danger-soft);
}

.callout.cyan,
.callout.blue {
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

code,
kbd,
samp {
  padding: 0.08rem 0.35rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  font-family: var(--mono);
  font-size: 0.8125em;
  color: var(--accent);
}

pre,
pre.code {
  margin: 0;
  overflow-x: auto;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.72;
}

pre code {
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  color: inherit;
}

.cb,
.code-block {
  margin: 1.1rem 0 1.7rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}

.cb-head,
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  background: var(--surface-muted);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.cb-head .lang,
.code-header .lang {
  color: var(--accent);
}

.cb pre,
.code-block pre,
.cb .code,
.code-block .code {
  padding: 1rem 1.1rem;
  background: var(--surface);
}

.run-btn,
.btn,
button.btn {
  appearance: none;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.run-btn:hover,
.btn:hover,
button.btn:hover {
  border-color: var(--accent-rule);
  color: var(--accent);
}

.run-btn,
.btn.act,
button.btn.act {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn.red,
button.btn.red {
  background: var(--danger-soft);
  border-color: var(--danger-rule);
  color: var(--danger);
}

.btn.green,
button.btn.green {
  background: var(--good-soft);
  border-color: var(--good-rule);
  color: var(--good);
}

.out,
.code-output {
  display: none;
  padding: 0.85rem 1.1rem;
  border-top: 1px solid var(--rule);
  background: var(--good-soft);
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.72;
  color: var(--good);
  white-space: pre-wrap;
}

.out.on,
.code-output.visible {
  display: block;
}

.out.err,
.code-output.error {
  background: var(--danger-soft);
  color: var(--danger);
}

.demo {
  margin: 1.1rem 0 1.7rem;
  padding: 1.15rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-1);
}

.demo-lbl,
.demo-label {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.8rem 0 1.3rem;
  font-size: 0.875rem;
}

th,
td {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--rule);
  vertical-align: top;
}

th {
  background: var(--surface-muted);
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: left;
  color: var(--ink-3);
}

td {
  color: var(--ink-2);
  background: var(--surface);
}

.footer,
footer {
  margin-top: 3rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--rule-strong);
}

.footer a,
footer a {
  display: block;
  padding: 0.2rem 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-2);
  text-decoration: none;
}

.footer a:hover,
footer a:hover {
  color: var(--accent);
}

.footer-note {
  margin-top: 0.9rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.7;
  color: var(--ink-3);
}

.muted {
  color: var(--ink-3);
}

.surface {
  background: var(--surface);
}

.surface-muted {
  background: var(--surface-muted);
}

.mono {
  font-family: var(--mono);
}

.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;
}

@media (max-width: 760px) {
  .page {
    padding: 0 1rem 4rem;
  }

  .topbar,
  .hero-pills,
  .meta-row {
    gap: 0.5rem;
  }

  .topbar {
    flex-wrap: wrap;
  }

  .hero {
    padding: 2.75rem 0 2rem;
  }

  .hero h1 {
    max-width: none;
  }

  .toc {
    grid-template-columns: 1fr;
  }

  .toc a,
  .toc-item {
    border-right: none;
  }

  .toc a:nth-last-child(-n + 2),
  .toc-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--rule);
  }

  .toc a:last-child,
  .toc-item:last-child {
    border-bottom: none;
  }

  .sec-head,
  .section-header,
  .cb-head,
  .code-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .page {
    width: 100%;
    max-width: none;
    padding: 0;
  }

  .toc,
  .cb,
  .code-block,
  .demo {
    box-shadow: none;
  }

  .run-btn,
  .btn,
  button.btn {
    display: none;
  }
}