/* Website contract: .stitch/DESIGN.md. Static and readable without JavaScript. */
@font-face {
  font-family: Geist;
  src: url("../fonts/geist-sans.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/geist-mono.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}
:root {
  color-scheme: light dark;
  --canvas: #ffffff;
  --outer: #fafafa;
  --ink: #171717;
  --secondary: #626262;
  --accent: #171717;
  --on-accent: #ffffff;
  --judgment: #f4f4f4;
  --surface: #fafafa;
  --rule: #e2e2e2;
  --rule-strong: #a1a1a1;
  --sans: Geist, ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  --width: 80rem;
  --gutter: clamp(1.25rem, 3.2vw, 3rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0a0a0a;
    --outer: #111111;
    --ink: #ededed;
    --secondary: #a1a1a1;
    --accent: #ededed;
    --on-accent: #0a0a0a;
    --judgment: #171717;
    --surface: #111111;
    --rule: #303030;
    --rule-strong: #737373;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--outer); scroll-padding-top: 1.5rem; }
body {
  margin: 0;
  color: var(--ink);
  font: 1rem/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
::selection { background: var(--accent); color: var(--on-accent); }
h1, h2, h3, p, blockquote, dl { margin: 0; }
h1, h2 { font-family: var(--sans); font-weight: 500; line-height: 1.1; letter-spacing: -0.045em; }
h2 { font-size: clamp(1.8rem, 2.8vw, 2.5rem); }
h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.35; }
p + p { margin-top: 0.8rem; }
img, svg { max-width: 100%; }
code, pre { font-family: var(--mono); }
code { font-size: 0.875em; overflow-wrap: anywhere; }

.skip {
  position: absolute;
  z-index: 10;
  top: -5rem;
  left: 1.25rem;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: var(--on-accent);
}
.skip:focus { top: 0.75rem; }
.site-header, .site-main, .footer-row {
  width: min(var(--width), calc(100% - 3rem));
  margin-inline: auto;
  border-inline: 1px solid var(--rule);
  background: var(--canvas);
}
.site-header { border-bottom: 1px solid var(--rule); }
.site-nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0 2rem; padding: 0.6rem var(--gutter); }
.brand { display: inline-flex; align-items: center; gap: 0.7rem; min-height: 44px; font: 600 1.35rem/1 var(--sans); letter-spacing: -0.05em; color: var(--ink); text-decoration: none; }
.brand-mark { width: 23px; height: 23px; }
.nav-links { display: flex; flex-wrap: wrap; gap: 0 1.4rem; list-style: none; padding: 0; margin: 0; }
.nav-links a { display: inline-flex; align-items: center; min-height: 44px; font: 400 0.8rem/1.4 var(--mono); color: var(--secondary); text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-underline-offset: 0.3em; }
.site-main { padding: 0; }
:where(.opening, .working-index, .useful-no, .installation, .first-prompt, .reading) { padding-inline: var(--gutter); }
.opening { position: relative; padding-block: 2.25rem 3.4rem; }
.opening-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 1rem; margin-bottom: 2.2rem; }
.opening-context, .release-link, .section-index, .study-label { font: 400 0.75rem/1.6 var(--mono); letter-spacing: 0.035em; color: var(--secondary); }
.opening-context::before { content: "/ "; }
.release-link { text-decoration: none; }
.release-link:hover { text-decoration: underline; }
.opening h1 { font-size: clamp(2.9rem, 7.7vw, 7rem); letter-spacing: -0.065em; line-height: 0.98; font-weight: 500; max-width: 17ch; }
.desktop-break { display: none; }
.opening-bottom { display: grid; gap: 1.5rem; margin-top: 2rem; }
.lede { max-width: 43rem; font-size: clamp(1.1rem, 1.8vw, 1.5rem); line-height: 1.45; letter-spacing: -0.025em; }
.opening-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.4rem; }
.opening-actions > a { min-height: 44px; display: inline-flex; align-items: center; font-size: 0.9rem; }
.button { justify-content: space-between; gap: 1.8rem; padding: 0.7rem 1rem; border: 1px solid var(--accent); border-radius: 5px; color: var(--on-accent); background: var(--accent); font-weight: 500; text-decoration: none; }
.button:hover { background: var(--canvas); color: var(--ink); text-decoration: none; }
.registration { position: absolute; width: 11px; height: 11px; left: -6px; bottom: -6px; z-index: 1; pointer-events: none; }
.registration::before, .registration::after { content: ""; position: absolute; background: var(--rule-strong); }
.registration::before { width: 11px; height: 1px; top: 5px; }
.registration::after { width: 1px; height: 11px; left: 5px; }
.registration-end { left: auto; right: -6px; }

/* A real example carries the identity, not a decorative app mockup. */
.decision-study { border-block: 1px solid var(--rule); }
.study-heading { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; padding: 1.8rem var(--gutter); }
.study-label { margin-bottom: 1rem; }
.study-heading h2 { font-size: clamp(1.6rem, 2.3vw, 2rem); }
.evidence-note { color: var(--secondary); font: 400 0.75rem/1.7 var(--mono); align-self: end; }
.decision-flow { display: grid; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--rule); }
.decision-flow > li { min-width: 0; padding: 1.5rem var(--gutter); border-bottom: 1px solid var(--rule); }
.stage-owner { color: var(--secondary); font: 400 0.75rem/1.6 var(--mono); margin-bottom: 1.25rem; }
.decision-flow h3 { margin-bottom: 0.6rem; }
.decision-flow blockquote { font-size: 1.2rem; letter-spacing: -0.025em; margin-bottom: 0.65rem; }
.judgment-stage { background: var(--judgment); }
.judgment-stage .stage-owner { color: var(--ink); font-weight: 500; }
.stage-result { color: var(--ink); font-weight: 500; border-top: 1px dashed var(--rule-strong); padding-top: 0.75rem; }
.study-test { display: grid; gap: 0.5rem 2rem; padding: 1.25rem var(--gutter); font-size: 0.9rem; }
.study-test h3 { font-weight: 500; }
.study-test p { max-width: 58rem; }

.working-index { display: grid; gap: 1.5rem 4rem; padding-block: 3.5rem; }
.section-index { margin-bottom: 1rem; }
.index-intro > p { color: var(--secondary); max-width: 36rem; margin-top: 1rem; }
.index-intro > .section-index { margin-top: 0; }
.index-intro > a { display: inline-block; margin-top: 1rem; padding-block: 0.35rem; }
.task-index > div { padding-block: 1.2rem; border-top: 1px solid var(--rule); }
.task-index dt { font-weight: 600; font-size: 1.1rem; }
.task-index dd { color: var(--secondary); margin: 0.4rem 0 0; }
.useful-no { padding-block: 1.5rem 2rem; border-block: 1px solid var(--rule); background: var(--surface); }
.useful-no h2 { font-size: 1.25rem; letter-spacing: -0.025em; }
.useful-no p { margin-top: 0.65rem; max-width: 60rem; }
.installation { display: grid; gap: 1.5rem 4rem; padding-block: 3.5rem; border-bottom: 1px solid var(--rule); }
.installation-intro p { color: var(--secondary); margin-top: 1rem; max-width: 35rem; }
.installation-intro > .section-index { margin-top: 0; }
.install-options { min-width: 0; }
.install-options section + section { margin-top: 1.5rem; }
.install-options h3 { font-weight: 500; margin-bottom: 0.55rem; }
pre { margin: 0; padding: 1rem; overflow: auto; max-width: 100%; color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; font-size: 0.8rem; line-height: 1.85; }
pre code { font-size: inherit; overflow-wrap: inherit; }
.install-help { margin-top: 1rem; }
.first-prompt { padding-block: 3rem; }
.first-prompt h2 { font-size: 1.7rem; }
.first-prompt blockquote { font: 400 clamp(1.25rem, 2.2vw, 1.7rem)/1.45 var(--sans); letter-spacing: -0.025em; margin-block: 1.5rem; padding-left: 1.3rem; border-left: 2px solid var(--ink); max-width: 50rem; }
.first-prompt > p { color: var(--secondary); }
.reading { display: grid; gap: 1.5rem 4rem; border-top: 1px solid var(--rule); padding-block: 2.5rem; }
.reading h2 { font-size: 1.7rem; margin-bottom: 1rem; }
.reading p { color: var(--secondary); max-width: 39rem; }
.reading-links { margin: 0; padding: 0; list-style: none; }
.reading-links li { padding-block: 0.5rem; }
.reading-links a { display: inline-block; padding-block: 0.2rem; }
.reading-links span { display: block; color: var(--secondary); font-size: 0.95rem; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 2rem; padding: 1.25rem var(--gutter); border-top: 1px solid var(--rule); color: var(--secondary); font: 400 0.75rem/1.7 var(--mono); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0 1rem; }
.footer-row a { display: inline-block; padding-block: 0.4rem; }

/* Shared reading pages, including historical release notes. */
.prose { max-width: 62rem; margin-inline: auto; padding: 3rem var(--gutter); overflow-wrap: anywhere; }
.prose > :first-child { margin-top: 0; }
.prose h1 { font-size: clamp(2.2rem, 4.8vw, 3.5rem); letter-spacing: -0.055em; margin-bottom: 1.5rem; }
.prose > p, .prose > ul, .prose > ol { max-width: 72ch; }
.prose h2 { margin: 2.5rem 0 0.9rem; }
.prose h3, .prose h4 { margin: 1.6rem 0 0.65rem; }
.prose p, .prose ul, .prose ol, .prose pre { margin-bottom: 1rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li + li { margin-top: 0.35rem; }
.prose blockquote { margin-block: 1rem; padding-inline: 1rem; color: var(--secondary); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin-block: 2rem; }
.prose table { width: 100%; border-collapse: collapse; table-layout: fixed; margin-bottom: 1.5rem; font-size: 0.95rem; }
.prose th, .prose td { padding: 0.65rem 0.6rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule); }
.prose td { hyphens: auto; }
.prose th { font-weight: 600; border-bottom-color: var(--ink); }
.table-scroll { max-width: 100%; overflow: auto; margin-bottom: 1.5rem; }
.prose .table-scroll table { min-width: 40rem; margin-bottom: 0; }
.table-hint { display: none; }
.page-examples .prose th:first-child { width: 29%; }
.recipe { border-top: 1px solid var(--rule); padding-block: 1.4rem; }
.recipe h3 { font-weight: 500; font-size: 1.5rem; letter-spacing: -0.035em; margin-top: 0; }
.recipe dt { font-weight: 500; }
.recipe dd { margin: 0.25rem 0 0.9rem; color: var(--secondary); }
.recipe .kicker { color: var(--secondary); font: 400 0.75rem/1.6 var(--mono); margin-bottom: 0.5rem; }
.meta-line { color: var(--secondary); margin-top: 1.4rem; }

/* Film: poster facade swaps to a YouTube iframe on click; JS-free readers follow the link. */
.film { display: grid; gap: 1.5rem 4rem; padding: 3.5rem var(--gutter) 2rem; border-top: 1px solid var(--rule); }
.film-intro > p:not(.section-index) { color: var(--secondary); margin-top: 1rem; max-width: 36rem; }
.film-intro > .section-index { margin-top: 0; }
.film-links { display: flex; flex-wrap: wrap; gap: 0.25rem 1.4rem; }
.film-links a { display: inline-flex; align-items: center; min-height: 44px; }
.film-player { margin: 0; }
.film-facade, .film-frame { position: relative; display: block; width: 100%; aspect-ratio: 16 / 9; border: 1px solid var(--rule); border-radius: 5px; overflow: hidden; background: #0e2a33; }
.film-frame { height: auto; }
.film-facade img { display: block; width: 100%; height: 100%; object-fit: cover; }
.film-play { position: absolute; right: 0.75rem; bottom: 0.75rem; display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.45rem 0.8rem 0.45rem 0.65rem; border-radius: 5px; background: rgba(10, 10, 10, 0.82); color: #fff; font: 500 0.8rem/1 var(--mono); box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.3); }
.film-play::before { content: ""; border-left: 0.7rem solid #fff; border-block: 0.45rem solid transparent; }
.film-facade:hover .film-play, .film-facade:focus-visible .film-play { background: #0a0a0a; box-shadow: 0 0 0 2px #fff; }
.film-player figcaption { margin-top: 0.6rem; color: var(--secondary); font: 400 0.75rem/1.6 var(--mono); }
.film-transcript { grid-column: 1 / -1; border-top: 1px solid var(--rule); padding-top: 1rem; }
.film-transcript summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; gap: 0.6rem; font-weight: 500; list-style: none; }
.film-transcript summary::-webkit-details-marker { display: none; }
.film-transcript summary::before { content: "+"; width: 1rem; font: 400 1rem/1 var(--mono); color: var(--secondary); }
.film-transcript[open] summary::before { content: "\2212"; }
.film-transcript p { color: var(--secondary); max-width: 44rem; margin-top: 0.75rem; }
@media (min-width: 62rem) { .film { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); align-items: start; } }

@media (min-width: 44rem) {
  .decision-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .decision-flow > li:nth-child(odd) { border-right: 1px solid var(--rule); }
  .study-test { grid-template-columns: 17rem minmax(0, 1fr); }
  .reading { grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr); }
  .recipe dl { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 0.65rem 1rem; }
  .recipe dd { margin: 0; }
}

@media (min-width: 62rem) {
  .desktop-break { display: inline; }
  .opening-bottom { grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 4rem; }
  .opening-actions { flex-direction: column; align-items: stretch; gap: 0.45rem; }
  .opening-actions > a:last-child { justify-content: center; }
  .decision-flow { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .decision-flow > li { border-right: 1px solid var(--rule); padding-inline: 1.5rem; }
  .decision-flow > li:first-child { padding-left: var(--gutter); }
  .decision-flow > li:last-child { border-right: 0; padding-right: var(--gutter); }
  .working-index { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }
  .installation { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }
}

@media not all and (min-width: 44rem) {
  .film-play { font-size: 0; gap: 0; right: 0.5rem; bottom: 0.5rem; padding: 0.45rem 0.5rem 0.45rem 0.65rem; }
  .site-header, .site-main, .footer-row { width: calc(100% - 1.5rem); }
  .opening { padding-top: 1.6rem; padding-bottom: 2rem; }
  .opening-meta { margin-bottom: 1.5rem; }
  .release-link { display: none; }
  .opening-bottom { margin-top: 1.5rem; }
  .evidence-note br { display: none; }
  .wide-break { display: none; }
  .nav-links { width: 100%; justify-content: space-between; gap: 0; }
  .nav-links a { font-size: 0.75rem; }
  .opening h1 { max-width: 15ch; }
  .prose { padding-block: 2rem; }
  .prose th, .prose td { padding-inline: 0.35rem; font-size: 0.9rem; }
  .table-hint { display: block; color: var(--secondary); font: 400 0.75rem/1.6 var(--mono); }
  pre { white-space: pre-wrap; overflow-wrap: anywhere; }
}

@media print {
  :root { --canvas: #fff; --outer: #fff; --ink: #000; --secondary: #333; --accent: #000; --surface: #fff; --judgment: #eee; --rule: #aaa; }
  .site-header, .site-footer, .skip, .opening-actions, .registration { display: none; }
  .site-main { width: 100%; padding: 0; }
  pre { white-space: pre-wrap; overflow-wrap: anywhere; }
  .decision-flow > li { break-inside: avoid; }
  .table-scroll { overflow: visible; }
  .prose .table-scroll table { min-width: 0; }
  .table-hint { display: none; }
}