:root {
  color-scheme: dark;
  --background: #10243a;
  --surface: #183049;
  --rule: #37506a;
  --text: #f4f2ea;
  --muted: #bbc8d3;
  --blue: #79b8d9;
  --orange: #f18b52;
  --purple: #b7a3d9;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: var(--background); color: var(--text); font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
button { font: inherit; }
a { color: var(--blue); text-underline-offset: .2em; }
a:hover { color: var(--orange); }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 4px; }
::selection { background: var(--orange); color: var(--background); }

.skip-link { position: fixed; top: -5rem; left: 1rem; z-index: 40; padding: .6rem .9rem; background: var(--orange); color: var(--background); }
.skip-link:focus { top: 1rem; }
.site-shell { display: flex; flex-direction: column; min-height: 100svh; }
.site-header, .site-footer { display: flex; align-items: center; flex: none; border-color: var(--rule); background: var(--background); }
.site-header { min-height: 60px; justify-content: space-between; gap: 1rem; padding: .5rem clamp(1rem, 4vw, 3rem); border-bottom: 1px solid var(--rule); }
.brand { color: var(--text); font-weight: 700; text-decoration: none; letter-spacing: -.03em; }
.brand span { color: var(--orange); }
.brand:hover { color: var(--text); }
.index-toggle { padding: .35rem .75rem; border: 1px solid var(--rule); background: transparent; color: var(--text); cursor: pointer; }
.index-toggle:hover, .index-toggle[aria-expanded="true"] { border-color: var(--orange); color: var(--orange); }

.slide-index { position: fixed; inset: 60px 0 56px; z-index: 20; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-content: start; gap: 2rem; overflow: auto; padding: clamp(1.5rem, 5vw, 4rem); background: var(--background); }
.slide-index[hidden], .slide[hidden] { display: none !important; }
.index-group h2 { margin: 0 0 .75rem; color: var(--orange); font-size: 1rem; }
.index-group a { display: flex; gap: .75rem; padding: .45rem 0; border-bottom: 1px solid var(--rule); color: var(--text); text-decoration: none; }
.index-group a span { color: var(--muted); font-family: var(--mono); font-size: .8rem; }
.index-group a:hover, .index-group a[aria-current="page"] { color: var(--orange); }

.slides { flex: 1; }
.slide { display: flex; align-items: center; min-height: calc(100svh - 116px); padding: clamp(2rem, 6vh, 4rem) clamp(1.25rem, 8vw, 8rem); }
.slide-content { width: min(100%, 960px); margin: auto; }
.eyebrow { margin: 0 0 1.5rem; color: var(--orange); font: 700 .82rem/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.slide h1, .slide h2, .slide h3 { line-height: 1.15; }
.slide h1, .slide h2 { max-width: 900px; margin: 0 0 1.5rem; letter-spacing: -.04em; font-weight: 700; text-wrap: balance; }
.slide h1 { font-size: clamp(3.8rem, 9vw, 7rem); }
.slide h2 { font-size: clamp(2.7rem, 6vw, 4.6rem); }
.slide h3 { margin: 0 0 .35rem; font-size: 1.25rem; }
.slide h1 em, .slide h2 em { color: var(--orange); font-style: normal; }
.lede { max-width: 780px; margin: 0 0 1.7rem; font-size: clamp(1.2rem, 2.3vw, 1.65rem); line-height: 1.45; }
.slide p { max-width: 850px; }
.source, .credit, .cover-hint { margin: 1.7rem 0 0; color: var(--muted); font-size: .82rem; }
.note { margin: 1.4rem 0 0; padding-left: 1rem; border-left: 2px solid var(--purple); color: var(--muted); }
.slide code:not(pre code) { color: var(--blue); font-family: var(--mono); font-size: .9em; }

.slide-cover .slide-content { max-width: 820px; }
.slide-cover h1 { margin-bottom: 1.7rem; }
.primary-link { display: inline-block; margin-top: .5rem; padding-bottom: .2rem; border-bottom: 2px solid var(--orange); color: var(--orange); font-weight: 700; text-decoration: none; }
.primary-link:hover { color: var(--text); }
.slide-divider { background: #172d46; }
.slide-divider h2 { font-size: clamp(3.4rem, 8vw, 6rem); }

.feature-grid, .compare-grid, .term-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.feature-grid-two, .compare-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.feature, .compare-grid > div, .term-grid > div { min-width: 0; padding-top: 1rem; border-top: 2px solid var(--rule); }
.feature-number { display: block; margin-bottom: 1rem; color: var(--orange); font: 700 .75rem var(--mono); }
.feature p, .compare-grid p, .term-grid span { margin: 0; color: var(--muted); }
.term-grid > div { display: grid; gap: .35rem; }
.term-grid strong { color: var(--blue); font-size: 1.3rem; }
.statement-list { max-width: 850px; margin-top: 2rem; }
.statement-list p { display: flex; gap: 1rem; margin: 0; padding: .7rem 0; border-bottom: 1px solid var(--rule); font-size: 1.25rem; }
.statement-list span { color: var(--orange); font-family: var(--mono); font-size: .8rem; }
.pill-grid { display: flex; flex-wrap: wrap; gap: .7rem 1.5rem; max-width: 850px; margin: 2rem 0; }
.pill-grid span::before { content: "• "; color: var(--orange); }
.flow { display: flex; align-items: center; gap: 1rem; margin-top: 2rem; }
.flow > div { flex: 1; min-width: 0; padding-top: .8rem; border-top: 2px solid var(--rule); }
.flow small { display: block; margin-bottom: .4rem; color: var(--orange); font: 700 .75rem var(--mono); }
.flow strong { font-size: 1.1rem; }
.flow > span { color: var(--orange); }

.callout { display: flex; align-items: start; gap: 1rem; max-width: 850px; margin-top: 2rem; padding: 1rem 0; border-top: 2px solid var(--rule); border-bottom: 1px solid var(--rule); }
.callout-icon { color: var(--orange); font-size: 1.3rem; }
.callout p { margin: .3rem 0 0; color: var(--muted); }
.callout a { margin-left: auto; white-space: nowrap; }
.step-list, .storage-list, .command-map, .resource-list { max-width: 900px; margin-top: 2rem; border-top: 1px solid var(--rule); }
.step-list > div { display: flex; align-items: baseline; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid var(--rule); }
.step-list b { color: var(--orange); font-family: var(--mono); }
.step-list p { margin: 0; font-size: 1.2rem; }
.storage-list > div, .command-map > div { display: grid; grid-template-columns: minmax(120px, .8fr) 2fr auto; align-items: baseline; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--rule); }
.storage-list code, .command-map code { color: var(--blue); font-family: var(--mono); }
.storage-list b { color: var(--purple); font: 700 .72rem var(--mono); }
.command-map > div { grid-template-columns: minmax(180px, 1fr) 1fr; }

.code-panel { max-width: 900px; margin-top: 2rem; border: 1px solid var(--rule); background: var(--surface); }
.code-heading { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; padding: .6rem 1rem; border-bottom: 1px solid var(--rule); color: var(--muted); font: .75rem var(--mono); }
.context { color: var(--orange); font: 700 .75rem var(--mono); }
.context-guest { color: var(--purple); }
.code-panel pre { overflow-x: auto; max-width: 100%; margin: 0; padding: 1rem; color: var(--text); font: .88rem/1.55 var(--mono); tab-size: 2; }
.code-panel code { font: inherit; }
.slide-code { align-items: start; }
.slide-code .eyebrow { margin-bottom: .7rem; }
.slide-code h2 { margin-bottom: .8rem; }
.slide-code .code-panel { margin-top: 0; }
.slide-code .note, .slide-code .source { margin-top: .8rem; }
.resource-list a { display: flex; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--rule); color: var(--text); text-decoration: none; }
.resource-list a:hover { color: var(--orange); }
.resource-list a span, .resource-list b { color: var(--orange); font-family: var(--mono); }
.resource-list b { margin-left: auto; }

.site-footer { min-height: 56px; justify-content: center; border-top: 1px solid var(--rule); }
.footer-controls { display: flex; align-items: center; gap: 1rem; }
.footer-controls button { border: 0; background: transparent; color: var(--blue); cursor: pointer; font-size: 1.4rem; }
.footer-controls button:hover:not(:disabled) { color: var(--orange); }
.footer-controls button:disabled { opacity: .35; cursor: default; }
#slide-position { min-width: 5rem; text-align: center; font: .82rem var(--mono); }

@media (max-width: 700px) {
  .slide { min-height: calc(100svh - 116px); padding: 2rem 1.3rem; }
  .slide-index { grid-template-columns: 1fr; }
  .feature-grid, .compare-grid, .term-grid { grid-template-columns: 1fr; gap: .9rem; }
  .flow { flex-direction: column; align-items: stretch; }
  .flow > span { transform: rotate(90deg); align-self: center; }
  .storage-list > div, .command-map > div { grid-template-columns: 1fr; gap: .2rem; }
  .callout { flex-wrap: wrap; }
  .callout a { margin-left: 0; }
  .code-panel pre { font-size: .75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}