/* Layout: single narrow reading column, system-doc feel, tight hierarchy via type scale + section numbers */

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --fg: #1b1d20;
  --fg-muted: #5a5f66;
  --fg-faint: #8a8f96;
  --rule: #e6e3dc;
  --accent: #2f6d4b;
  --mark: #f1efe8;
  --radius: 10px;
  --font-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121316;
    --surface: #1a1c20;
    --fg: #ecebe8;
    --fg-muted: #a3a7ad;
    --fg-faint: #70747b;
    --rule: #2a2d33;
    --accent: #7cc296;
    --mark: #22252a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121316;
  --surface: #1a1c20;
  --fg: #ecebe8;
  --fg-muted: #a3a7ad;
  --fg-faint: #70747b;
  --rule: #2a2d33;
  --accent: #7cc296;
  --mark: #22252a;
  color-scheme: dark;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 680px;
  margin: 0 auto;
  padding-inline: 24px;
  padding-block: 56px 96px;
}

header.doc {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 28px;
  margin-bottom: 40px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.eyebrow .dot { color: var(--accent); }

h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 7vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 14px 0 10px;
  text-wrap: balance;
}
.lede {
  color: var(--fg-muted);
  font-size: 17px;
  max-width: 56ch;
  text-wrap: pretty;
}

section {
  margin-top: 44px;
}
h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin: 0 0 14px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
h2 .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  min-width: 2.5ch;
}
h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  margin: 22px 0 6px;
  color: var(--fg);
}

p { margin: 10px 0; }
p + p { margin-top: 12px; }

ul {
  margin: 10px 0;
  padding-left: 1.1em;
}
li { margin: 6px 0; }
li::marker { color: var(--fg-faint); }

strong { font-weight: 600; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-thickness: 2px; }

.callout {
  background: var(--mark);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14.5px;
  color: var(--fg-muted);
}
.callout strong { color: var(--fg); }

.table-of-rows {
  border-top: 1px solid var(--rule);
  margin-top: 14px;
}
.row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.row .k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
  text-transform: uppercase;
}
.row .v { color: var(--fg); font-size: 15px; }
@media (max-width: 520px) {
  .row { grid-template-columns: 1fr; gap: 4px; }
}

footer.doc {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  color: var(--fg-faint);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

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

@media (prefers-reduced-motion: no-preference) {
  a { transition: text-decoration-thickness 120ms ease; }
}