:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2230;
  --line: #30363d;
  --text: #e6edf3;
  --muted: #9aa5b1;
  --accent: #58a6ff;
  --cmd: #d2a8ff;
  --good: #3fb950;
  --bad: #f85149;
  --warn: #d29922;
  --focus: #ffd33d;
  --radius: 6px;
  --mono: "Cascadia Code", "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  --sans: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  /* Spacing grows with the viewport so wide screens get room and phones stay compact. */
  --gutter: clamp(20px, 4vw, 48px);
  --gap: clamp(12px, 0.5rem + 0.8vw, 24px);
  --pad: clamp(14px, 0.5rem + 0.85vw, 20px);
  --section: clamp(40px, 1.5rem + 3vw, 72px);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); overflow-wrap: break-word; }
img { max-width: 100%; height: auto; }

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
main:focus { outline: none; }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 0.6em; text-wrap: balance; }
h1 { font-size: clamp(1.9rem, 1.4rem + 2vw, 2.7rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.4rem, 1.2rem + 0.8vw, 1.75rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

code { font-family: var(--mono); font-size: 0.9em; background: var(--panel-2); color: var(--text); padding: 1px 5px; border-radius: 4px; overflow-wrap: anywhere; }
pre { font-family: var(--mono); font-size: 0.88rem; line-height: 1.55; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; margin: 0 0 1em; }
pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

.skip-link { position: absolute; left: -9999px; top: 0; z-index: 20; background: var(--focus); color: #000; padding: 8px 12px; font-weight: 600; }
.skip-link:focus { left: 8px; top: 8px; }

.wrap { width: 100%; max-width: 1360px; margin-inline: auto; padding-inline: var(--gutter); }

/* Single-column grids must not let a wide <pre> or table stretch the page. */
.intro, .walk, .steps, .doc-layout { grid-template-columns: minmax(0, 1fr); }
.steps > li, .guides > li, .lab-cards > li { min-width: 0; }

/* Header and footer */
.site-header { border-bottom: 1px solid var(--line); background: var(--panel); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-block: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 600; }
.brand-mark { display: inline-grid; place-items: center; width: 32px; height: 32px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel-2); color: var(--cmd); font: 700 18px var(--mono); }
.nav { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav a { display: block; padding: 8px 14px; border-radius: var(--radius); color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--text); background: var(--panel-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--panel-2); box-shadow: inset 0 -2px 0 var(--accent); }

.site-footer { border-top: 1px solid var(--line); margin-top: calc(var(--section) * 1.5); color: var(--muted); font-size: 0.92rem; }
.footer-inner { padding-block: 32px 40px; }
.footer-inner p:last-child { margin-bottom: 0; }

/* Buttons */
.button, button {
  display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 8px 14px;
  font: inherit; font-weight: 600; line-height: 1.2; color: var(--text); background: var(--panel-2);
  border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; cursor: pointer;
}
.button:hover, button:hover { border-color: var(--accent); }
.button.primary { background: var(--accent); border-color: var(--accent); color: #0d1117; }
.button.primary:hover { background: #79b8ff; }
.button.ghost { background: transparent; }

/* Intro */
.intro { display: grid; gap: clamp(28px, 4vw, 64px); padding-block: clamp(40px, 5vw, 80px) clamp(24px, 3vw, 48px); align-items: center; }
.eyebrow { color: var(--cmd); font: 600 0.85rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.75em; }
.lead { font-size: clamp(1.1rem, 1rem + 0.3vw, 1.25rem); color: var(--text); max-width: 60ch; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 16px; }
.note { color: var(--muted); font-size: 0.92rem; }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); list-style: none; margin: 0; padding: 0; }
.facts li { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: var(--pad); color: var(--muted); font-size: 0.95rem; line-height: 1.4; }
.facts strong { display: block; margin-bottom: 4px; color: var(--text); font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); line-height: 1.2; font-family: var(--mono); }

/* GIF player: a still poster on the page. site.js opens the GIF in the full-screen theater. */
.player { margin: 0; }
.player-media img { display: block; width: 100%; aspect-ratio: 16 / 9; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.player-media img.is-playable { cursor: pointer; }
.player-media:hover img.is-playable { border-color: var(--accent); }
/* The Play button sits under the poster, so it never hides the evidence in the frame. */
.player-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin-top: 14px; }
.player-toggle { padding: 10px 18px; border-color: var(--accent); }
.player-toggle::before { content: "\25B6" / ""; font-size: 0.8em; color: var(--accent); }
.player-links { color: var(--muted); font-size: 0.92rem; }
.tag {
  display: inline-block; padding: 1px 8px; border: 1px solid var(--line); border-radius: 999px;
  font: 600 0.75rem/1.6 var(--sans); color: var(--muted); background: var(--panel-2); white-space: nowrap;
}

/* Sections */
.section { padding-top: var(--section); }
.section > h2 { padding-top: calc(var(--section) * 0.6); border-top: 1px solid var(--line); margin-bottom: 0.75em; }
.section > p { max-width: 78ch; }

.table-wrap { overflow-x: auto; margin: 0 0 1em; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 14px 18px; border-bottom: 1px solid var(--line); }
thead th { background: var(--panel); color: var(--muted); font-size: 0.85rem; font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
tbody th { font-weight: 600; white-space: nowrap; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0 0 1em; display: grid; gap: var(--gap); }
.steps > li { counter-increment: step; position: relative; padding: var(--pad) var(--pad) var(--pad) 64px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.steps > li::before { content: counter(step); position: absolute; left: 18px; top: var(--pad); width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; background: var(--panel-2); border: 1px solid var(--line); font: 700 0.85rem var(--mono); color: var(--accent); }
.steps .cmd { margin: 10px 0 0; }
.cmd { padding: 10px 14px; white-space: pre-wrap; overflow-wrap: anywhere; }

/* Walkthroughs */
.walk { display: grid; gap: clamp(20px, 3vw, 48px); padding-block: clamp(28px, 3vw, 48px); border-bottom: 1px solid var(--line); }
.walk:last-child { border-bottom: 0; }
.walk-text h3 { font-size: 1.3rem; }
.walk-text p { max-width: 62ch; }
.observed { color: var(--muted); font-size: 0.92rem; }
.observed code { color: var(--good); }

.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; list-style: none; margin: 0 0 12px; padding: 0; }
.flow li { display: inline-flex; align-items: center; }
.flow li + li::before { content: "\2192" / ""; color: var(--muted); padding-inline: 6px; }
.flow code { color: var(--cmd); }
td .flow { margin: 0; }

/* Page header for lab, guide and transcript pages */
.page-head { padding-block: clamp(28px, 4vw, 56px) 8px; }
.page-head .lead { max-width: 70ch; }
.page-head .actions { margin: 20px 0 0; }
.page-head + .section, .page-head + .doc-layout { padding-top: 24px; }
.page-head + .section > h2 { border-top: 0; padding-top: 0; }
.downloads { margin-top: 16px; }

/* Lab cards on the home page */
.lab-cards { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.lab-card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.lab-card:hover { border-color: var(--accent); }
.lab-card-media img { display: block; width: 100%; aspect-ratio: 16 / 9; border-bottom: 1px solid var(--line); }
.lab-card-body { display: flex; flex-direction: column; flex: 1; padding: var(--pad); }
.lab-card-body h3 { font-size: 1.4rem; }
.lab-card-body h3 a { color: var(--text); text-decoration: none; }
.lab-card-body h3 a:hover { color: var(--accent); }
.lab-card-body .note { margin: 0 0 6px; }
.lab-card-body .actions { margin: auto 0 0; padding-top: 16px; }
.code-list { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.code-list code { color: var(--cmd); }

.transcript-player { max-width: 80ch; margin: 8px 0 32px; }

.guides { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); }
.guides li { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: var(--pad); }
.guides a { font-weight: 600; }
.guides span { display: block; color: var(--muted); font-size: 0.92rem; margin-top: 6px; }

/* Rendered docs */
.crumbs ol { display: flex; flex-wrap: wrap; gap: 4px; list-style: none; margin: 0; padding: 24px 0 0; font-size: 0.9rem; color: var(--muted); }
.crumbs li + li::before { content: "/" / ""; padding-right: 4px; color: var(--line); }
.crumbs [aria-current] { overflow-wrap: anywhere; }

.doc-layout { display: grid; gap: clamp(24px, 4vw, 56px); padding-top: 24px; }
.toc { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 16px 18px; font-size: 0.9rem; }
.toc-title { font-weight: 600; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc li { margin-bottom: 6px; }

.prose { min-width: 0; max-width: 80ch; }
.prose h1 { margin-bottom: 0.5em; }
.prose h2 { margin-top: 1.8em; padding-top: 0.6em; border-top: 1px solid var(--line); }
.prose h3 { margin-top: 1.4em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.3em; }
.prose li > p { margin-bottom: 0.4em; }
.prose blockquote { margin: 0 0 1em; padding: 8px 14px; border-left: 4px solid var(--accent); background: var(--panel); color: var(--muted); }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose img { border: 1px solid var(--line); border-radius: var(--radius); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.prose table code { white-space: nowrap; }

/* Copy buttons, added by site.js */
.code-block { position: relative; }
.code-block pre { padding-right: 76px; }
.copy { position: absolute; top: 6px; right: 6px; min-height: 30px; padding: 4px 10px; font-size: 0.8rem; font-weight: 500; }

/* Full-screen walkthrough theater, added by site.js */
html.theater-open { overflow: hidden; }
.theater { width: 100%; height: 100%; max-width: none; max-height: none; margin: 0; padding: 0; border: 0; background: var(--bg); color: var(--text); overflow: hidden; }
.theater::backdrop { background: var(--bg); }
.theater-frame { display: grid; grid-template-rows: auto minmax(0, 1fr); width: 100%; height: 100%; background: var(--bg); }
.theater-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding: 10px var(--gutter); border-bottom: 1px solid var(--line); background: var(--panel); }
.theater-title { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; min-width: 0; margin: 0; font-weight: 600; }
.theater-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; }
.theater-hint { display: none; flex-basis: 100%; margin: 0; color: var(--muted); font-size: 0.9rem; }
@media (orientation: portrait) and (max-width: 767px) { .theater-hint { display: block; } }
.theater-stage { display: grid; min-height: 0; padding: clamp(8px, 2vw, 24px); }
.theater-stage img { display: block; width: 100%; height: 100%; min-height: 0; object-fit: contain; }
kbd { padding: 0 6px; border: 1px solid var(--line); border-radius: 4px; background: var(--bg); color: var(--muted); font: 600 0.75rem/1.6 var(--mono); }

@media (min-width: 768px) {
  .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  body { font-size: 17px; }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 260px; align-items: start; }
  .doc-layout.no-toc { grid-template-columns: minmax(0, 1fr); }
  .doc-layout .toc { grid-column: 2; grid-row: 1; position: sticky; top: 16px; max-height: calc(100vh - 32px); overflow-y: auto; }
  .doc-layout .prose { grid-column: 1; grid-row: 1; }
}

@media (min-width: 1100px) {
  .intro { grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); }
  .intro > .facts { grid-column: 1 / -1; }
  .walk { grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); align-items: center; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (forced-colors: active) {
  .tag, .button, button, .steps > li::before, kbd { border: 1px solid CanvasText; }
  .nav a[aria-current="page"] { text-decoration: underline; }
}

@media print {
  .site-header, .site-footer, .skip-link, .player-toggle, .copy, .toc, .theater { display: none !important; }
  body { background: #fff; color: #000; }
  .player { max-width: 36rem; }
  .walk, .steps > li { break-inside: avoid; }
}