:root {
  --deck-bg: #f3f0e7;
  --deck-surface: #fffdf8;
  --deck-ink: #25332e;
  --deck-muted: #596860;
  --deck-line: #d6d9cf;
  --deck-green: #326b58;
  --deck-rust: #b75e3e;
  --deck-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --r-background-color: var(--deck-bg);
  --r-main-font: Inter, ui-sans-serif, system-ui, sans-serif;
  --r-main-font-size: 36px;
  --r-main-color: var(--deck-ink);
  --r-heading-font: Inter, ui-sans-serif, system-ui, sans-serif;
  --r-heading-color: var(--deck-ink);
  --r-heading-text-transform: none;
  --r-heading-font-weight: 650;
  --r-heading-margin: 0;
  --r-block-margin: 0;
  --r-link-color: var(--deck-green);
  --r-link-color-hover: #224d40;
  --r-selection-background-color: #326b5840;
  --r-selection-color: var(--deck-ink);
  color-scheme: light;
  background: var(--deck-bg);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--deck-bg);
  color: var(--deck-ink);
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: -4rem;
  left: 1rem;
  padding: .7rem 1rem;
  background: var(--deck-ink);
  color: var(--deck-surface);
}

.skip-link:focus { top: 1rem; }

.deck-footer {
  position: fixed;
  z-index: 10;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  min-height: 2.8rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-inline: clamp(1rem, 4vw, 3.5rem);
  border-top: 1px solid var(--deck-line);
  background: var(--deck-bg);
  color: var(--deck-muted);
  font-family: var(--deck-mono);
  font-size: .6rem;
}

.deck-footer i { padding-inline: .3rem; color: var(--deck-green); font-style: normal; }

.reveal {
  width: 100%;
  height: calc(100vh - 2.8rem);
  height: calc(100dvh - 2.8rem);
  font-size: clamp(14px, 1.65vw, 21px);
}

.reveal .slides { text-align: left; }
.reveal .slides section { padding: 1rem 0; }
.reveal .slides section > * { margin-right: 0; margin-left: 0; }
.reveal h1, .reveal h2, .reveal h3, .reveal p { color: var(--deck-ink); font-family: inherit; text-transform: none; text-shadow: none; }
.reveal h1, .reveal h2 { font-weight: 650; letter-spacing: -.045em; line-height: 1.05; }
.reveal h1 { margin: 0 0 1rem; font-size: clamp(2.8rem, 6.8vw, 6rem); }
.reveal h2 { max-width: 20ch; margin: 0 0 1.1rem; font-size: clamp(2rem, 4.5vw, 4rem); }
.reveal h3 { margin: 0 0 .5rem; font-size: 1.05rem; font-weight: 650; }
.reveal p { line-height: 1.5; }
.reveal .slides section .chapter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 100%;
  margin: 0 0 1.35rem;
  color: var(--deck-green);
  font-family: var(--deck-mono);
  font-size: .58rem;
  letter-spacing: .04em;
}

.chapter span { color: var(--deck-muted); }
.lead { max-width: 55ch; margin: 0; color: var(--deck-muted) !important; font-size: 1rem; }
.signal-tag { display: flex; align-items: center; gap: .55rem; color: var(--deck-green) !important; font-family: var(--deck-mono); font-size: .62rem; }
.signal-tag span { width: .45rem; height: .45rem; border-radius: 50%; background: var(--deck-rust); }
.title-layout { display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 2rem; }
.title-slide h1 { max-width: 9ch; }
.title-slide .lead { max-width: 39ch; }
.deck-hint { margin: 1.6rem 0 0; color: var(--deck-muted) !important; font-size: .67rem; }
.headset-illustration { position: relative; width: min(100%, 20rem); height: 15rem; margin: auto; }
.earcup { position: absolute; top: 4.5rem; left: 6.1rem; width: 8rem; height: 6.5rem; border: 1rem solid var(--deck-green); border-top: 0; border-radius: 0 0 4.2rem 4.2rem; }
.headband { position: absolute; top: 1.7rem; left: 6rem; width: 8.3rem; height: 7.3rem; border: .6rem solid var(--deck-ink); border-bottom: 0; border-radius: 5rem 5rem 0 0; }
.mic-arm { position: absolute; top: 9.7rem; left: 12.3rem; width: 4.6rem; height: 2.3rem; border-top: .25rem solid var(--deck-rust); border-right: .25rem solid var(--deck-rust); border-radius: 0 1rem 0 0; transform: rotate(-8deg); }
.mic-dot { position: absolute; top: 11.75rem; left: 16.5rem; width: .7rem; height: .7rem; border-radius: 50%; background: var(--deck-rust); }
.host-pill { position: absolute; right: 0; bottom: 0; display: flex; align-items: center; gap: .55rem; padding: .6rem .75rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); font-family: var(--deck-mono); font-size: .53rem; }
.host-pill span { color: var(--deck-green); font-size: .9rem; }
.host-pill b { color: var(--deck-muted); font-weight: 500; }

.route-map { display: grid; grid-template-columns: 1fr auto 1.3fr auto 1fr; align-items: center; gap: .7rem; margin: 2rem 0 1.4rem; }
.route-node { min-height: 7.5rem; display: flex; flex-direction: column; justify-content: center; gap: .25rem; padding: 1rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.route-host { border-color: var(--deck-green); }
.node-icon { display: grid; width: 2rem; height: 2rem; margin-bottom: .35rem; place-items: center; border-radius: .3rem; background: #326b5818; color: var(--deck-green); font-family: var(--deck-mono); font-size: .7rem; }
.route-node strong { font-size: .85rem; }
.route-node small { color: var(--deck-muted); font-size: .65rem; }
.route-link { color: var(--deck-green); font-size: 1.5rem; }
.takeaway { margin: 1.2rem 0 0; padding: .8rem 1rem; border-left: 3px solid var(--deck-rust); background: #ffffffa6; color: var(--deck-muted) !important; font-size: .72rem; }
.takeaway b { margin-right: .4rem; color: var(--deck-ink); }

.check-layout { display: grid; grid-template-columns: 1.5fr .8fr; gap: 1.3rem; align-items: stretch; margin-top: 1.5rem; }
.check-list { display: grid; gap: .6rem; margin: 0; padding: 0; list-style: none; }
.check-list li { display: flex; align-items: center; gap: .85rem; padding: .75rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.check-list li > span, .trouble-grid article > span { color: var(--deck-green); font-family: var(--deck-mono); font-size: .65rem; }
.check-list strong, .check-list small { display: block; }
.check-list strong { font-size: .77rem; }
.check-list small { margin-top: .18rem; color: var(--deck-muted); font-size: .64rem; }
.callout { align-self: stretch; padding: 1rem; border: 1px solid #b75e3e70; border-radius: .3rem; background: #b75e3e0d; }
.callout strong { color: var(--deck-rust); font-size: .78rem; }
.callout p { margin: .6rem 0 0; color: var(--deck-muted); font-size: .72rem; }

.mode-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.8rem 0 1rem; }
.mode-card { min-height: 10rem; padding: 1.1rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.mode-card p { margin: 0; color: var(--deck-muted); font-size: .77rem; }
.mode-card h3 { margin-top: .8rem; }
.mode-symbol { display: grid; width: 1.5rem; height: 1.5rem; place-items: center; border-radius: 50%; font-size: .65rem; }
.mode-symbol.open { background: #326b5818; color: var(--deck-green); }
.mode-symbol.held { background: #b75e3e18; color: var(--deck-rust); }
.reveal kbd { display: inline-block; padding: .15rem .4rem; border: 1px solid var(--deck-line); border-radius: .2rem; color: var(--deck-ink); background: var(--deck-surface); font-family: var(--deck-mono); font-size: .8em; }

.press-sequence { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: .6rem; margin: 1.8rem 0 1rem; }
.press-step { min-height: 10.8rem; display: flex; flex-direction: column; align-items: flex-start; padding: .85rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.step-number { align-self: flex-end; color: var(--deck-muted); font-family: var(--deck-mono); font-size: .6rem; }
.button-drawing { display: grid; width: 3rem; height: 2.2rem; margin: .35rem 0 .7rem; place-items: center; border: 1px solid #25332e50; border-bottom: 3px solid #25332e70; border-radius: .35rem; background: var(--deck-bg); color: var(--deck-ink); font-family: var(--deck-mono); font-size: .67rem; }
.active-step { border-color: var(--deck-green); }
.active-step .button-drawing { border-color: var(--deck-green); color: var(--deck-green); }
.press-step strong { font-size: .73rem; }
.press-step small { margin-top: .35rem; color: var(--deck-muted); font-size: .62rem; line-height: 1.45; }
.sequence-arrow { color: var(--deck-green); }
.sound-waves { display: flex; height: 2.2rem; align-items: center; gap: .25rem; margin: .35rem 0 .7rem; }
.sound-waves i { width: .2rem; height: .6rem; border-radius: 1rem; background: var(--deck-green); }
.sound-waves i:nth-child(2), .sound-waves i:nth-child(4) { height: 1rem; }
.sound-waves i:nth-child(3) { height: 1.5rem; }
.release-mark { height: 2.2rem; margin: .35rem 0 .7rem; color: var(--deck-rust); font-size: 1.7rem; }

.queue-board { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: .6rem; margin: 1.8rem 0 .9rem; }
.queue-state { min-height: 7rem; display: flex; flex-direction: column; justify-content: center; padding: .8rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.queue-state span { color: var(--deck-muted); font-family: var(--deck-mono); font-size: .52rem; letter-spacing: .04em; }
.queue-state strong { margin: .4rem 0 .15rem; font-size: .85rem; }
.queue-state small { color: var(--deck-muted); font-size: .62rem; }
.queue-state.speaking { border-color: var(--deck-green); }
.queue-state.speaking span, .queue-state.next span { color: var(--deck-green); }
.queue-state.waiting { border-color: var(--deck-rust); }
.queue-state.waiting span { color: var(--deck-rust); }
.queue-arrow { color: var(--deck-green); }
.plain-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: .9rem 0; padding-left: 1.1rem; color: var(--deck-muted); font-size: .66rem; }
.plain-list li::marker { color: var(--deck-green); }

.control-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 1.3rem; align-items: stretch; margin-top: 1.5rem; }
.control-callout { display: flex; flex-direction: column; justify-content: center; padding: 1.1rem; border: 1px solid var(--deck-green); border-radius: .3rem; background: var(--deck-surface); }
.large-button { width: 4rem; height: 3rem; font-size: .9rem; }
.control-callout strong { font-size: .88rem; }
.control-callout p { margin: .35rem 0 0; color: var(--deck-muted); font-size: .68rem; }
.control-notes { display: grid; gap: .5rem; }
.control-notes > p { display: flex; align-items: flex-start; gap: .7rem; margin: 0; padding: .7rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.control-notes strong, .control-notes small { display: block; }
.control-notes strong { font-size: .7rem; }
.control-notes small { margin-top: .2rem; color: var(--deck-muted); font-size: .61rem; line-height: 1.4; }
.no-mark, .caution-mark { width: 1rem; flex: 0 0 1rem; color: var(--deck-rust); font-family: var(--deck-mono); font-size: .8rem; text-align: center; }
.caution-mark { color: var(--deck-green); }

.trouble-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 1.6rem; }
.trouble-grid article { min-height: 9.5rem; padding: .95rem; border: 1px solid var(--deck-line); border-radius: .3rem; background: var(--deck-surface); }
.trouble-grid article h3 { margin-top: .8rem; }
.trouble-grid article p { margin: 0; color: var(--deck-muted); font-size: .69rem; }
.closing-slide h2 { max-width: 14ch; font-size: clamp(2.6rem, 6vw, 5.2rem); }
.closing-bottom { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; margin-top: 1.8rem; padding-top: 1rem; border-top: 1px solid var(--deck-line); }
.closing-bottom p { max-width: 38ch; margin: 0; color: var(--deck-muted); font-size: .75rem; }
.closing-bottom a { color: var(--deck-green); font-size: .72rem; text-decoration-color: #326b5870; text-underline-offset: .25rem; }
.closing-bottom a span { margin-left: .25rem; }

.reveal .controls { color: var(--deck-green); }
.reveal .progress { height: 3px; color: var(--deck-green); }
.reveal .slide-number { right: clamp(1rem, 4vw, 3.5rem); bottom: 3.5rem; color: var(--deck-muted); background: transparent; font-family: var(--deck-mono); font-size: .6rem; }

@media (max-width: 700px) {
  .reveal { font-size: 16px; }
  .reveal .slides section { padding: .65rem 0; }
  .title-layout { grid-template-columns: 1fr; gap: .4rem; }
  .title-slide h1 { max-width: 12ch; }
  .headset-illustration { width: 16rem; height: 11rem; transform: scale(.77); transform-origin: top center; }
  .title-slide .deck-hint { margin-top: -.5rem; }
  .route-map { grid-template-columns: 1fr; gap: .3rem; margin: .8rem 0; }
  .route-map .route-node, .route-map .route-node:nth-of-type(2), .route-map .route-node:last-child,
  .route-map .route-link, .route-map .route-link:nth-of-type(2) { grid-column: 1; grid-row: auto; }
  .route-map .route-link { justify-self: center; transform: rotate(90deg); }
  .route-node { min-height: 5.5rem; padding: .6rem; }
  .route-node strong { font-size: .68rem; }
  .route-node small { font-size: .58rem; }
  .check-layout, .control-layout { grid-template-columns: 1fr; gap: .65rem; }
  .check-list { gap: .35rem; }
  .check-list li { padding: .5rem; }
  .callout { padding: .7rem; }
  .callout p { margin-top: .3rem; }
  .mode-cards { gap: .5rem; margin: 1rem 0 .6rem; }
  .mode-card { min-height: 8.5rem; padding: .7rem; }
  .press-sequence { gap: .2rem; margin: 1rem 0 .7rem; }
  .press-step { min-height: 9.5rem; padding: .5rem; }
  .press-step strong { font-size: .63rem; }
  .press-step small { font-size: .53rem; }
  .queue-board { gap: .2rem; margin: 1rem 0 .6rem; }
  .queue-state { min-height: 6rem; padding: .5rem; }
  .queue-state span { font-size: .42rem; }
  .queue-state strong { font-size: .68rem; }
  .queue-state small { font-size: .52rem; }
  .plain-list { gap: .4rem; padding-left: .85rem; font-size: .55rem; }
  .control-layout { margin-top: .8rem; }
  .control-callout { padding: .65rem; }
  .control-notes { gap: .3rem; }
  .control-notes > p { padding: .5rem; }
  .trouble-grid { gap: .4rem; margin-top: .8rem; }
  .trouble-grid article { min-height: 8.5rem; padding: .6rem; }
  .trouble-grid article h3 { font-size: .82rem; }
  .trouble-grid article p { font-size: .56rem; }
  .closing-bottom { align-items: flex-start; flex-direction: column; margin-top: 1rem; }
  .deck-footer { min-height: 2.2rem; padding-inline: .8rem; font-size: .46rem; }
  .deck-footer span:first-child { max-width: 8rem; }
  .deck-footer span:last-child { text-align: right; }
  .reveal { height: calc(100vh - 2.2rem); height: calc(100dvh - 2.2rem); }
  .reveal .slide-number { bottom: 2.2rem; }
}

@media (max-height: 620px) and (min-width: 701px) {
  .reveal { font-size: 15px; }
  .reveal .slides section { padding: .2rem 0; }
  .reveal .slides section > .chapter { margin-bottom: .65rem; }
  .reveal h2 { margin-bottom: .6rem; font-size: clamp(2rem, 4vw, 3.5rem); }
  .title-layout { gap: .8rem; }
  .headset-illustration { transform: scale(.8); }
  .check-layout, .mode-cards, .press-sequence, .queue-board { margin-top: .8rem; }
  .press-step { min-height: 8.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal .slides section, .reveal .controls, .reveal .progress { transition: none !important; }
}