/* zeno-lang.org. Hand-written, no build step.
   One accent (the terracotta of Greek pottery), warm neutrals, three typefaces:
   a serif for headlines, a sans for reading, a mono for code. */

:root {
  --bg: #faf8f3;
  --surface: #ffffff;
  --sunk: #f2efe7;
  --ink: #1c1a16;
  --soft: #5d584e;
  --faint: #8d877a;
  --line: #e4dfd3;
  --accent: #b4441c;
  --accent-ink: #ffffff;
  --good: #2f7d4f;
  --bad: #b3261e;
  --tok-key: #b4441c;
  --tok-type: #1f6f78;
  --tok-str: #4d7a2a;
  --tok-num: #8a5a00;
  --tok-fn: #1c1a16;
  --tok-com: #9a9486;
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --wide: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11100e; --surface: #191815; --sunk: #0c0b0a; --ink: #efebe2; --soft: #aaa497;
    --faint: #7a7569; --line: #2b2924; --accent: #ec7f52; --accent-ink: #1a0d06;
    --good: #6cc48d; --bad: #f08b80;
    --tok-key: #ec7f52; --tok-type: #6fc3cc; --tok-str: #a5c97a; --tok-num: #e0b45c;
    --tok-fn: #efebe2; --tok-com: #6f6a5f;
  }
}
:root[data-theme="dark"] {
  --bg: #11100e; --surface: #191815; --sunk: #0c0b0a; --ink: #efebe2; --soft: #aaa497;
  --faint: #7a7569; --line: #2b2924; --accent: #ec7f52; --accent-ink: #1a0d06;
  --good: #6cc48d; --bad: #f08b80;
  --tok-key: #ec7f52; --tok-type: #6fc3cc; --tok-str: #a5c97a; --tok-num: #e0b45c;
  --tok-fn: #efebe2; --tok-com: #6f6a5f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans); -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 0.2em; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
code, pre { font-family: var(--mono); }
p code, dd code, dt code, span code, li code {
  font-size: 0.875em; background: var(--sunk); border: 1px solid var(--line);
  padding: 0.1em 0.35em; border-radius: 5px; white-space: nowrap;
}
h1, h2 { font-family: var(--serif); font-weight: 400; letter-spacing: -0.015em; margin: 0; text-wrap: balance; }
h3, h4 { font-weight: 600; margin: 0; letter-spacing: -0.01em; }

/* --- The bar that never arrives --- */
.progress { position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 30; }
.progress-fill { height: 100%; width: 0; background: var(--accent); }

/* --- Navigation --- */
.nav {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 2rem;
  padding: 0.85rem max(1rem, calc((100vw - var(--wide)) / 2));
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; font: 400 1.6rem/1 var(--serif); }
.brand:hover { color: inherit; }
.mark { width: 1.35rem; height: 1.35rem; fill: var(--accent); }
.nav nav { display: flex; gap: 1.5rem; margin-left: auto; font-size: 0.9375rem; }
.nav nav a { text-decoration: none; color: var(--soft); }
.nav nav a:hover { color: var(--ink); }
.nav-end { display: flex; align-items: center; gap: 0.5rem; }
.theme {
  width: 2.25rem; height: 2.25rem; display: grid; place-items: center; cursor: pointer;
  background: none; border: 1px solid transparent; border-radius: 8px; color: var(--soft);
}
.theme:hover { border-color: var(--line); color: var(--ink); }
.theme svg { width: 1.15rem; height: 1.15rem; }

.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 2.75rem;
  padding: 0 1.25rem; border-radius: 10px; font-weight: 500; font-size: 1rem; text-decoration: none;
  background: var(--ink); color: var(--bg); border: 1px solid var(--ink);
  transition: transform 0.15s ease, background 0.15s ease;
}
.button:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); transform: translateY(-1px); }
.button.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.button.ghost:hover { border-color: var(--ink); background: transparent; color: var(--ink); }
.button.small { min-height: 2.25rem; padding: 0 0.9rem; font-size: 0.9375rem; border-radius: 8px; }

/* --- Layout --- */
main, .foot { max-width: var(--wide); margin: 0 auto; padding: 0 1rem; }
.section { padding: 6rem 0 0; }
.section-head { max-width: 44rem; margin-bottom: 2.5rem; }
.section-head h2 { font-size: clamp(2.1rem, 4.6vw, 3.25rem); line-height: 1.08; margin: 0.6rem 0 1rem; }
.section-head p { color: var(--soft); margin: 0; font-size: 1.125rem; }
.step {
  font: 500 0.8125rem/1 var(--mono); color: var(--accent); letter-spacing: 0.02em;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); padding: 0.3rem 0.55rem; border-radius: 99px;
}

/* --- Hero --- */
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 3.5rem; align-items: center; padding: 5.5rem 0 4rem; }
.eyebrow { font: 500 0.8125rem/1 var(--mono); color: var(--faint); letter-spacing: 0.04em; text-transform: uppercase; margin: 0 0 1.5rem; }
.hero h1 { font-size: clamp(2.9rem, 6.6vw, 5.25rem); line-height: 1; }
.hero h1 em { color: var(--accent); }
.lede { font-size: 1.2rem; color: var(--soft); max-width: 34rem; margin: 1.75rem 0 2.25rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* --- Code windows --- */
.window {
  margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  box-shadow: 0 1px 2px rgb(28 26 22 / 0.04), 0 12px 32px -16px rgb(28 26 22 / 0.18);
}
.window figcaption {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.6rem 1rem; border-bottom: 1px solid var(--line); color: var(--faint); font: 400 0.8125rem/1.4 var(--mono);
}
.window pre { margin: 0; padding: 1.1rem 1.15rem; overflow-x: auto; font-size: 0.84rem; line-height: 1.7; tab-size: 4; }
.window pre.out, pre.out { background: var(--sunk); color: var(--soft); }
.window.plain pre { color: var(--faint); }
.out-label {
  padding: 0.45rem 1.15rem; font: 400 0.75rem/1.4 var(--mono); color: var(--faint);
  background: var(--sunk); border-top: 1px solid var(--line); letter-spacing: 0.03em;
}
.out-label + pre.out { padding-top: 0.2rem; }
.out .err { color: var(--bad); font-weight: 500; }
.out .mark-line { color: var(--bad); }
.t-key { color: var(--tok-key); } .t-type { color: var(--tok-type); } .t-str { color: var(--tok-str); }
.t-num { color: var(--tok-num); } .t-fn { color: var(--tok-fn); font-weight: 500; } .t-com { color: var(--tok-com); font-style: italic; }

/* --- Facts --- */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
.facts div { padding: 1.75rem 1.5rem 1.75rem 0; }
.facts div + div { padding-left: 1.5rem; border-left: 1px solid var(--line); }
.facts b { display: block; font: 400 3rem/1 var(--serif); margin-bottom: 0.6rem; font-variant-numeric: tabular-nums; }
.facts span { color: var(--soft); font-size: 0.9375rem; line-height: 1.5; display: block; }

/* --- Why --- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.rules { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem 2.5rem; margin: 3rem 0 2rem; }
.rules h3 { font: 400 1.75rem/1.2 var(--serif); margin-bottom: 0.5rem; }
.rules p { margin: 0; color: var(--soft); }
.ledger { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.ledger > div { border: 1px solid var(--line); border-radius: 14px; padding: 1.5rem; background: var(--surface); }
.ledger h4 { font: 500 0.8125rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); margin-bottom: 1rem; }
.ledger dl { margin: 0; display: grid; grid-template-columns: minmax(7rem, auto) 1fr; gap: 0.85rem 1.25rem; font-size: 0.9375rem; }
.ledger dt { color: var(--ink); }
.ledger dd { margin: 0; color: var(--soft); }
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.25rem 2.5rem; margin-top: 3.5rem; }
.pillars article { border-top: 1px solid var(--ink); padding-top: 1rem; }
.pillars h3 { font-size: 1.0625rem; margin-bottom: 0.4rem; }
.pillars p { margin: 0; color: var(--soft); font-size: 0.9688rem; }

/* --- Tour --- */
.tabs { display: flex; gap: 0.35rem; overflow-x: auto; padding-bottom: 0.75rem; margin-bottom: 0.75rem; scrollbar-width: thin; }
.tabs button {
  flex: none; font: 500 0.9375rem/1 var(--sans); padding: 0.65rem 0.95rem; border-radius: 99px; cursor: pointer;
  background: transparent; color: var(--soft); border: 1px solid var(--line);
}
.tabs button:hover { color: var(--ink); border-color: var(--faint); }
.tabs button[aria-selected="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.panel { display: grid; grid-template-columns: minmax(0, 18rem) minmax(0, 1fr); gap: 2.5rem; align-items: start; }
.panel[hidden] { display: none; }
.note { margin: 0.5rem 0 0; color: var(--soft); font-size: 1.0625rem; }

/* --- Styles --- */
.given { margin: 0 0 1.25rem; font-size: 0.84rem; padding: 0.9rem 1.15rem; border: 1px dashed var(--line); border-radius: 12px; overflow-x: auto; }
.four { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; align-items: start; }

/* --- Firmware --- */
.board-row { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 1.25rem; align-items: stretch; }
.board { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 2rem 1.5rem 1.25rem; display: flex; flex-direction: column; }
.lamps, .lamp-names { display: grid; grid-template-columns: repeat(4, 1fr); justify-items: center; }
.lamp { width: 3.25rem; height: 3.25rem; border-radius: 50%; border: 1px solid var(--line); background: var(--sunk); transition: background 0.12s, box-shadow 0.12s; }
.lamp.red.on { background: #e5484d; box-shadow: 0 0 28px #e5484d99; }
.lamp.amber.on { background: #f5a524; box-shadow: 0 0 28px #f5a52499; }
.lamp.green.on { background: #30a46c; box-shadow: 0 0 28px #30a46c99; }
.lamp.led { width: 1.1rem; height: 1.1rem; align-self: center; }
.lamp.led.on { background: var(--accent); box-shadow: 0 0 14px var(--accent); }
.lamp-names { margin: 0.6rem 0 1.5rem; font: 400 0.75rem/1 var(--mono); color: var(--faint); }
.log { flex: 1; margin: 0; border-radius: 10px; padding: 0.9rem 1rem; font-size: 0.8125rem; line-height: 1.7; height: 12.5rem; overflow: hidden; display: flex; flex-direction: column; justify-content: flex-end; }
.caption { font-size: 0.8125rem; color: var(--faint); margin: 1rem 0 0; }
.flags { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; margin: 2.5rem 0; }
.flags article { border-top: 1px solid var(--ink); padding-top: 1rem; }
.flag { display: block; font-size: 0.875rem; font-weight: 500; color: var(--accent); margin-bottom: 0.5rem; }
.flags p { margin: 0; color: var(--soft); font-size: 0.9375rem; }
.report pre { white-space: pre-wrap; overflow-wrap: anywhere; }
.aside { color: var(--soft); max-width: 44rem; margin: 1.25rem 0 0; }

/* --- Pipeline --- */
.pipeline { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 1.5rem; }
.stages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.75rem; }
.stage, .engine { position: relative; border: 1px solid var(--line); border-radius: 10px; padding: 0.9rem 1rem; background: var(--bg); }
.stage b, .engine b { display: block; font-weight: 600; font-size: 0.9688rem; }
.stage span, .engine span { display: block; color: var(--soft); font-size: 0.8438rem; line-height: 1.45; margin-top: 0.2rem; }
.stage:not(:last-child)::after { content: "→"; position: absolute; right: -1.35rem; top: 50%; translate: 0 -50%; color: var(--faint); }
.engines { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.75rem; margin-top: 2.5rem; position: relative; }
.engines::before { content: ""; position: absolute; top: -1.25rem; left: 12.5%; right: 12.5%; border-top: 1px solid var(--line); }
.engine::before { content: ""; position: absolute; top: -1.25rem; left: 50%; height: 1.25rem; border-left: 1px solid var(--line); }
.engines::after { content: ""; position: absolute; top: -2.5rem; right: 12.5%; height: 1.25rem; border-left: 1px solid var(--line); }
.engine code { display: inline-block; font-size: 0.78rem; color: var(--accent); margin: 0.3rem 0 0.1rem; }
.pillars.three { margin-top: 3rem; }

/* --- Roadmap --- */
.jobs { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.jobs li { display: grid; grid-template-columns: minmax(0, 17rem) minmax(0, 1fr) 7.5rem; gap: 1.5rem; align-items: baseline; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.jobs b { font-weight: 500; }
.jobs span { color: var(--soft); font-size: 0.9688rem; }
.jobs i { font: 500 0.75rem/1 var(--mono); font-style: normal; color: var(--faint); text-align: right; text-transform: uppercase; letter-spacing: 0.05em; }
.jobs li.now i { color: var(--good); }
.jobs li.now i::before { content: ""; display: inline-block; width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--good); margin-right: 0.45rem; }

/* --- Start --- */
.shell { max-width: 44rem; }
.copy { font: 500 0.75rem/1 var(--mono); padding: 0.35rem 0.6rem; border-radius: 6px; border: 1px solid var(--line); background: transparent; color: var(--soft); cursor: pointer; }
.copy:hover { color: var(--ink); border-color: var(--faint); }
.commands { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem 2.5rem; margin-top: 2.5rem; }
.commands code { display: block; font-size: 0.84rem; color: var(--ink); margin-bottom: 0.25rem; }
.commands span { color: var(--soft); font-size: 0.9375rem; }

/* --- Footer --- */
.foot { padding-top: 7rem; padding-bottom: 3rem; }
.foot blockquote { font: italic 400 clamp(2rem, 5vw, 3.5rem)/1.1 var(--serif); margin: 0 0 1.5rem; max-width: 40rem; }
.foot p { color: var(--soft); max-width: 44rem; margin: 0; }
.foot-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); color: var(--faint); font-size: 0.9375rem; }

/* --- Smaller screens --- */
@media (max-width: 60rem) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; padding: 3.5rem 0 3rem; }
  .facts { grid-template-columns: 1fr 1fr; }
  .facts div:nth-child(3) { padding-left: 0; border-left: 0; }
  .facts div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .pillars, .commands { grid-template-columns: 1fr 1fr; }
  .panel { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  .note { margin-top: 0; }
  .four, .board-row { grid-template-columns: minmax(0, 1fr); }
  .flags { grid-template-columns: 1fr 1fr; }
  .stages, .engines { grid-template-columns: 1fr 1fr; }
  .stage::after, .engines::before, .engines::after, .engine::before { display: none; }
  .engines { margin-top: 1.75rem; padding-top: 1.75rem; border-top: 1px dashed var(--line); }
}
@media (max-width: 40rem) {
  body { font-size: 1rem; }
  .nav { gap: 1rem; }
  .nav nav { display: none; }
  .nav-end { margin-left: auto; }
  .section { padding-top: 4.5rem; }
  .compare, .rules, .ledger, .pillars, .commands, .flags { grid-template-columns: minmax(0, 1fr); }
  .ledger dl { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .ledger dd { margin-bottom: 0.75rem; }
  .jobs li { grid-template-columns: minmax(0, 1fr) auto; gap: 0.25rem 1rem; }
  .jobs span { grid-column: 1 / -1; grid-row: 2; }
  .window pre { font-size: 0.78rem; }
  .stages, .engines { gap: 0.75rem; }
  .pipeline { padding: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ===== Pages beyond the home page ===== */

.skip { position: absolute; left: -999px; top: 0; z-index: 40; background: var(--ink); color: var(--bg); padding: 0.5rem 1rem; border-radius: 0 0 8px 0; }
.skip:focus { left: 0; }
.nav nav a[aria-current="page"] { color: var(--ink); font-weight: 500; }
.nav nav a[aria-current="page"]::after { content: ""; display: block; height: 2px; background: var(--accent); margin-top: 2px; border-radius: 2px; }
.more { margin: 2rem 0 0; font-weight: 500; }
.more a { text-decoration: none; color: var(--accent); }
.more a:hover span { margin-left: 0.25rem; }
.more span { transition: margin 0.15s ease; }
.eyebrow a { text-decoration: none; color: inherit; }
.eyebrow a:hover { color: var(--accent); }

.page-head { max-width: 46rem; padding: 4.5rem 0 3rem; }
.page-head h1 { font-size: clamp(2.6rem, 6vw, 4.25rem); line-height: 1.02; }
.page-head .lede { margin: 1.25rem 0 0; }
.lede.small { font-size: 1.0625rem; margin: 1rem 0 2rem; }
.muted { color: var(--soft); }
.narrow { max-width: 50rem; margin: 0 auto; padding: 4rem 0 0; }
.narrow > h1 { font-size: clamp(2.3rem, 5vw, 3.5rem); line-height: 1.05; }
.source { font-size: 0.9375rem; color: var(--faint); margin-top: 3rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.note-small { font-size: 0.875rem; color: var(--faint); margin: 0.75rem 0 0; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 1rem; }
.card {
  display: flex; flex-direction: column; gap: 0.35rem; padding: 1.25rem 1.25rem 1.35rem; text-decoration: none;
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { color: inherit; border-color: var(--faint); transform: translateY(-2px); box-shadow: 0 12px 28px -18px rgb(28 26 22 / 0.35); }
.card b { font-weight: 600; font-size: 1.0313rem; }
.card span { color: var(--soft); font-size: 0.9375rem; line-height: 1.5; }
.card code { font-size: 0.8125rem; color: var(--accent); }
.cards.examples .card span { color: var(--faint); font: 400 0.75rem/1 var(--mono); margin-top: auto; padding-top: 0.5rem; }
.doc-group { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 1fr); gap: 2rem; padding: 2.5rem 0; border-top: 1px solid var(--line); }
.doc-group-head h2 { font-size: 1.75rem; line-height: 1.15; }
.doc-group-head p { color: var(--soft); margin: 0.5rem 0 0; font-size: 0.9688rem; }

/* Pager */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2rem; }
.pager a { display: flex; flex-direction: column; gap: 0.2rem; padding: 1rem 1.15rem; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; font-weight: 500; }
.pager a:hover { border-color: var(--faint); color: inherit; }
.pager a span { font: 400 0.75rem/1 var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: 0.05em; }
.pager .next { text-align: right; grid-column: 2; }

/* Docs layout */
.doc-layout { display: grid; grid-template-columns: 14rem minmax(0, 1fr) 13rem; gap: 3rem; padding-top: 3rem; align-items: start; }
.doc-layout.wide-toc { grid-template-columns: 17rem minmax(0, 1fr); }
.doc-nav, .doc-toc { position: sticky; top: 5rem; max-height: calc(100vh - 6rem); overflow-y: auto; font-size: 0.9063rem; padding-bottom: 2rem; scrollbar-width: thin; }
.doc-nav h4, .doc-toc h4, .learn-toc h4 { font: 500 0.75rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); margin: 1.5rem 0 0.6rem; }
.doc-nav h4:first-child, .doc-toc h4:first-child, .learn-toc h4:first-child { margin-top: 0.5rem; }
.doc-nav a { display: block; padding: 0.3rem 0 0.3rem 0.75rem; text-decoration: none; color: var(--soft); border-left: 1px solid var(--line); line-height: 1.4; }
.doc-nav a:hover { color: var(--ink); }
.doc-nav a[aria-current="page"] { color: var(--ink); border-left: 2px solid var(--accent); padding-left: calc(0.75rem - 1px); font-weight: 500; }
.doc-toc ul, .decisions-nav ul { list-style: none; margin: 0; padding: 0; }
.doc-toc a, .decisions-nav a { display: block; padding: 0.25rem 0; text-decoration: none; color: var(--soft); line-height: 1.4; }
.doc-toc a:hover, .decisions-nav a:hover { color: var(--ink); }
.doc-toc ul ul a { padding-left: 0.75rem; font-size: 0.875rem; }
.decisions-nav > ul > li > a { color: var(--ink); font-weight: 500; margin-top: 0.5rem; }
.decisions-nav ul ul a { padding-left: 0.75rem; font-size: 0.8438rem; border-left: 1px solid var(--line); }
.doc-toc a.on, .decisions-nav a.on { color: var(--accent); }

/* Prose */
.prose { min-width: 0; max-width: 46rem; }
.prose > h1 { font-size: clamp(2.3rem, 5vw, 3.4rem); line-height: 1.05; margin: 0.25rem 0 1.5rem; }
.prose h2 { font: 400 2rem/1.15 var(--serif); margin: 3rem 0 1rem; letter-spacing: -0.01em; }
.prose h3 { font-size: 1.1875rem; margin: 2.25rem 0 0.75rem; }
.prose h4 { margin: 1.75rem 0 0.5rem; }
.prose h2, .prose h3 { scroll-margin-top: 5rem; }
.prose p, .prose li { color: color-mix(in srgb, var(--ink) 82%, var(--bg)); }
.prose p { margin: 0 0 1.1rem; }
.prose ul, .prose ol { padding-left: 1.4rem; margin: 0 0 1.25rem; }
.prose li { margin: 0.35rem 0; }
.prose li::marker { color: var(--faint); }
.prose pre { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.15rem; overflow-x: auto; font-size: 0.84rem; line-height: 1.65; margin: 0 0 1.4rem; }
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; white-space: pre; }
.prose code { white-space: normal; font-size: 0.875em; background: var(--sunk); border: 1px solid var(--line); padding: 0.1em 0.35em; border-radius: 5px; overflow-wrap: anywhere; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.5rem; font-size: 0.9375rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 0.6rem 0.9rem 0.6rem 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-weight: 600; border-bottom-color: var(--ink); }
.prose blockquote { margin: 0 0 1.4rem; padding: 0.25rem 0 0.25rem 1.25rem; border-left: 2px solid var(--accent); }
.prose blockquote p { color: var(--soft); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.prose em { color: inherit; }
.about blockquote p { font: italic 400 1.75rem/1.25 var(--serif); color: var(--ink); }

/* Learn */
.learn-layout { display: grid; grid-template-columns: 13rem minmax(0, 1fr); gap: 3.5rem; align-items: start; }
.learn-toc { position: sticky; top: 5rem; padding-top: 4.75rem; font-size: 0.9063rem; max-height: calc(100vh - 2rem); overflow-y: auto; scrollbar-width: thin; }
.learn-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: lesson; }
.learn-toc li { counter-increment: lesson; }
.learn-toc a { display: flex; gap: 0.6rem; padding: 0.28rem 0; text-decoration: none; color: var(--soft); line-height: 1.35; }
.learn-toc a::before { content: counter(lesson, decimal-leading-zero); font: 400 0.75rem/1.6 var(--mono); color: var(--faint); }
.learn-toc a:hover, .learn-toc a.on { color: var(--ink); }
.learn-toc a.on::before { color: var(--accent); }
.lesson { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 2.5rem; padding: 3rem 0; border-top: 1px solid var(--line); scroll-margin-top: 4.5rem; align-items: start; }
.lesson.wide { grid-template-columns: minmax(0, 1fr); }
.lesson.wide .lesson-text { max-width: 40rem; }
.lesson.wide .lesson-code { display: none; }
.lesson h2 { font: 400 2rem/1.1 var(--serif); margin: 0.5rem 0 0.9rem; }
.lesson p { color: var(--soft); margin: 0 0 1rem; }
.lesson .num { font: 500 0.8125rem/1 var(--mono); color: var(--accent); }
.lesson .shell { max-width: none; margin-bottom: 1rem; }
.lesson-text .window pre { font-size: 0.8rem; }
.cmd-list { margin: 0; display: grid; grid-template-columns: minmax(0, auto) minmax(0, 1fr); gap: 0.7rem 1.5rem; font-size: 0.9375rem; border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem; background: var(--surface); }
.cmd-list dt code { font-size: 0.8125rem; white-space: nowrap; }
.cmd-list dd { margin: 0; color: var(--soft); }
.next-steps { padding: 3rem 0 0; border-top: 1px solid var(--line); }
.next-steps h2 { font-size: 2rem; margin-bottom: 1.5rem; }

/* Examples */
.example-title { margin: 0.25rem 0 0; }

/* Roadmap */
.roadmap { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; }
.roadmap h2 { font-size: 2.25rem; display: flex; align-items: center; gap: 0.75rem; }
.roadmap .muted { margin: 0.5rem 0 1.5rem; }
.dot { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--faint); display: inline-block; }
.dot.good { background: var(--good); }
.done-list { list-style: none; margin: 0; padding: 0; counter-reset: done; border-left: 1px solid var(--line); }
.done-list li { counter-increment: done; position: relative; }
.done-list li::before { content: ""; position: absolute; left: -0.3rem; top: 1.15rem; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--good); }
.done-list a { display: block; padding: 0.7rem 0 0.7rem 1.25rem; text-decoration: none; }
.done-list a:hover b { color: var(--accent); }
.done-list b { display: block; font-weight: 500; }
.done-list span { color: var(--soft); font-size: 0.9375rem; }
.next-list { list-style: none; margin: 0; padding: 0; }
.next-list li { padding: 0.9rem 1.1rem; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 0.65rem; background: var(--surface); }
.next-list li.in { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.next-list i { display: block; font: 500 0.7rem/1 var(--mono); font-style: normal; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); margin-bottom: 0.4rem; }
.next-list li.in i { color: var(--accent); }
.next-list b { display: block; font-weight: 500; }
.next-list span { color: var(--soft); font-size: 0.9375rem; }

/* 404 */
.lost { padding-top: 6rem; }
.lost .window { margin: 2rem 0; }
.lost .actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Footer links */
.foot-links { display: grid; grid-template-columns: repeat(3, minmax(0, 12rem)); gap: 2rem; margin-top: 3rem; }
.foot-links h4 { font: 500 0.75rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); margin: 0 0 0.75rem; }
.foot-links a { display: block; text-decoration: none; color: var(--soft); padding: 0.2rem 0; font-size: 0.9375rem; }
.foot-links a:hover { color: var(--ink); }

@media (max-width: 75rem) {
  .doc-layout { grid-template-columns: 13rem minmax(0, 1fr); }
  .doc-toc { display: none; }
}
@media (max-width: 60rem) {
  .doc-layout, .doc-layout.wide-toc, .learn-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .doc-nav, .decisions-nav, .learn-toc { position: static; max-height: none; }
  .doc-nav { order: 2; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
  .decisions-nav { display: none; }
  .learn-toc { display: none; }
  .lesson { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  .doc-group { grid-template-columns: minmax(0, 1fr); gap: 1.25rem; }
  .roadmap { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 40rem) {
  .nav { flex-wrap: wrap; row-gap: 0.4rem; }
  .nav nav { display: flex; order: 3; width: 100%; margin: 0; overflow-x: auto; gap: 1.25rem; padding-bottom: 0.2rem; scrollbar-width: none; font-size: 0.9063rem; }
  .nav nav::-webkit-scrollbar { display: none; }
  .nav nav a { flex: none; }
  .page-head { padding: 3rem 0 2rem; }
  .narrow { padding-top: 2.5rem; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager .next { grid-column: 1; }
  .foot-links { grid-template-columns: 1fr 1fr; }
  .cmd-list { grid-template-columns: minmax(0, 1fr); gap: 0.15rem; }
  .cmd-list dd { margin-bottom: 0.6rem; }
  .cmd-list dt code { white-space: normal; }
}
.prose pre.out { background: var(--sunk); color: var(--soft); }