/* ==========================================================================
   Deck 2 · Agents, Not Chats: Fable 5.1 Max in the Enterprise
   Hive Research Institute · AI Practicum
   --------------------------------------------------------------------------
   Layout model: a 16:9 "stage" that fits the viewport. Every size is expressed
   in --u (1% of stage width), so the deck scales identically on any screen.
   ========================================================================== */

:root {
  --cream: #FFFDF7;
  --cream-2: #F8F3E6;
  --cream-3: #ECE4CF;
  --ink: #17150F;
  --ink-2: #3B372C;
  --ink-3: #6E6858;
  --gold: #A67C1B;
  --gold-2: #C9A227;
  --gold-3: #E8D48B;
  --gold-soft: rgba(201, 162, 39, .14);
  --red: #B4432E;
  --green: #3F7D4E;
  --white: #FFFFFF;

  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;

  --sw: min(100%, 177.7778vh);   /* stage width; 100% avoids 100vw scrollbar overflow */
  --sh: min(56.25vw, 100vh);      /* stage height */
  --u: calc(var(--sw) / 100);     /* 1% of stage width */

  --ease: cubic-bezier(.22, .72, .18, 1);
  --t: 720ms;                     /* slide transition */
  --ov-s: .21;                    /* overview thumbnail scale */
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  font-size: calc(var(--u) * 1.7);
  line-height: 1.45;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 500; margin: 0; letter-spacing: -.012em; }
h2 em, h1 em { font-style: italic; color: var(--gold); font-weight: 400; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
b, strong { font-weight: 600; }
kbd {
  font-family: var(--sans); font-size: .85em; font-weight: 500;
  padding: .05em .45em; border: 1px solid var(--cream-3); border-bottom-width: 2px;
  border-radius: .35em; background: var(--white); color: var(--ink-2);
}
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
:focus-visible { outline: 3px solid var(--gold-2); outline-offset: 3px; border-radius: 4px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ic { width: 1.25em; height: 1.25em; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex: none; }

/* ---------- Deck + stage ---------- */
.deck {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  background: var(--cream);
  transition: background .5s var(--ease);
}
.deck.is-dark { background: var(--ink); }
.stage-clip { position: relative; width: var(--sw); height: var(--sh); overflow: hidden; }
.stage {
  position: absolute; inset: 0;
  perspective: calc(var(--u) * 220);
  perspective-origin: 50% 50%;
  user-select: none; -webkit-user-select: none;
}

/* ---------- Slides + 3D transitions ---------- */
.slide {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  padding: calc(var(--u) * 5.2) calc(var(--u) * 7) calc(var(--u) * 5.6);
  background: var(--cream);
  opacity: 0; visibility: hidden;
  transform: translate3d(0, 0, calc(var(--u) * -40));
  transform-origin: 50% 50%;
  backface-visibility: hidden;
  outline: none;
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease), visibility 0s linear var(--t);
  will-change: transform, opacity;
}
.slide.is-prev { transform: translate3d(-46%, 0, calc(var(--u) * -32)) rotateY(-36deg); }
.slide.is-next { transform: translate3d(46%, 0, calc(var(--u) * -32)) rotateY(36deg); }
.slide.is-active { opacity: 1; visibility: visible; transform: none; transition-delay: 0s, 0s, 0s; z-index: 2; }
.stage.no-transition .slide, .stage.no-transition .fragment, .stage.no-transition .stagger > * { transition: none !important; }

.slide-dark { background: var(--ink); color: var(--cream); }
.slide-dark h2 em { color: var(--gold-2); }
.slide-dark .eyebrow { color: var(--gold-2); }
.slide-dark .eyebrow::before { background: var(--gold-2); }
.slide-dark .muted, .slide-dark .lead { color: rgba(255, 253, 247, .78); }

/* speaker notes never render on stage */
.notes { display: none; }
.slide-num { display: none; }

/* ---------- Fragments (incremental reveals) ---------- */
.fragment { opacity: 0; transform: translateY(calc(var(--u) * .9)); transition: opacity .55s var(--ease), transform .55s var(--ease); }
.fragment.is-visible { opacity: 1; transform: none; }
.stagger > * { opacity: 0; transform: translateY(calc(var(--u) * .9)); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.fragment.stagger { transform: none; opacity: 1; }          /* the group itself stays put; children animate */
.fragment.is-visible.stagger > * { opacity: 1; transform: none; }
.stagger > *:nth-child(2) { transition-delay: .1s; }
.stagger > *:nth-child(3) { transition-delay: .2s; }
.stagger > *:nth-child(4) { transition-delay: .3s; }
.stagger > *:nth-child(5) { transition-delay: .4s; }
.stagger > *:nth-child(6) { transition-delay: .5s; }

/* ---------- Typography ---------- */
.eyebrow {
  font-family: var(--sans); font-weight: 600; text-transform: uppercase;
  letter-spacing: .16em; font-size: calc(var(--u) * 1.15); color: var(--gold);
  margin-bottom: calc(var(--u) * 1.6); display: flex; align-items: center; gap: calc(var(--u) * .9);
}
.eyebrow::before { content: ""; display: inline-block; width: calc(var(--u) * 2.4); height: 1px; background: var(--gold); flex: none; }
h1 { font-size: calc(var(--u) * 5.4); line-height: 1.02; letter-spacing: -.018em; max-width: calc(var(--u) * 66); }
h1 .thin { font-weight: 300; font-style: italic; color: var(--gold); }
h2 { font-size: calc(var(--u) * 4.3); line-height: 1.06; max-width: calc(var(--u) * 78); margin-bottom: calc(var(--u) * 2.6); text-wrap: balance; }
h3 { font-size: calc(var(--u) * 2.2); line-height: 1.15; }
.lead { font-family: var(--serif); font-size: calc(var(--u) * 2.05); line-height: 1.4; color: var(--ink-2); max-width: calc(var(--u) * 62); }
.muted { color: var(--ink-3); }
.kicker {
  margin-top: auto; padding-top: calc(var(--u) * 1.8);
  font-family: var(--serif); font-size: calc(var(--u) * 2.3); color: var(--ink);
  border-top: 1px solid var(--cream-3);
}
.kicker em { color: var(--gold); }
.footnote { margin-top: auto; padding-top: calc(var(--u) * 1.4); font-size: calc(var(--u) * 1.25); color: var(--ink-3); max-width: calc(var(--u) * 80); }
.tag { display: inline-block; font-size: calc(var(--u) * 1.05); text-transform: uppercase; letter-spacing: .12em; color: var(--ink-3); border: 1px solid var(--cream-3); border-radius: 999px; padding: .35em .9em; }
.hint { margin-top: calc(var(--u) * 2.6); font-size: calc(var(--u) * 1.25); color: var(--ink-3); }
.hint-inline { margin-top: calc(var(--u) * 1.4); font-size: calc(var(--u) * 1.15); color: var(--ink-3); text-transform: uppercase; letter-spacing: .12em; }
.pill {
  display: inline-flex; align-items: center; gap: .5em;
  background: var(--ink); color: var(--gold-3); font-size: calc(var(--u) * 1.1); font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; padding: .5em 1em; border-radius: 999px; white-space: nowrap;
}

/* ---------- Scenes (Three.js / Canvas hosts) ---------- */
.scene { position: absolute; inset: 0; overflow: hidden; }
.scene-canvas { display: block; width: 100%; height: 100%; }
[data-scene-interactive] { cursor: grab; touch-action: none; }
[data-scene-interactive].is-dragging { cursor: grabbing; }
.scene-labels { position: absolute; inset: 0; pointer-events: none; }
.orbit-label {
  position: absolute; left: 0; top: 0; transform: translate(-50%, -50%);
  font-family: var(--sans); font-size: calc(var(--u) * 1.15); font-weight: 600; letter-spacing: .06em;
  color: var(--ink); background: rgba(255, 253, 247, .85); border: 1px solid var(--cream-3);
  padding: .25em .65em; border-radius: 999px; white-space: nowrap; will-change: transform, opacity;
}
.orbit-label.is-core { background: var(--ink); color: var(--gold-3); border-color: var(--ink); }
.orbit-label.is-gate { background: transparent; border-color: var(--gold-2); color: var(--gold); font-weight: 500; }

/* ---------- Slide 0 · Title ---------- */
.slide-title { justify-content: flex-end; }
.slide-title .scene { z-index: 0; }
.title-wrap { position: relative; z-index: 1; max-width: calc(var(--u) * 70); }
.title-wrap::before {
  content: ""; position: absolute; z-index: -1;
  inset: calc(var(--u) * -5) calc(var(--u) * -10) calc(var(--u) * -4) calc(var(--u) * -8);
  background: radial-gradient(ellipse at 35% 55%, rgba(255, 253, 247, .97) 30%, rgba(255, 253, 247, .8) 60%, rgba(255, 253, 247, 0) 82%);
}
.title-wrap .lead { margin-top: calc(var(--u) * 2.2); }
.title-meta { display: flex; align-items: center; gap: calc(var(--u) * 1.4); margin-top: calc(var(--u) * 2.8); font-size: calc(var(--u) * 1.3); color: var(--ink-3); max-width: calc(var(--u) * 66); }
.slide-title .hint { position: relative; z-index: 1; }

/* ---------- Slide 1 · Compare ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: calc(var(--u) * 3); }
.col { padding: calc(var(--u) * 2.2) calc(var(--u) * 2.6); border-radius: calc(var(--u) * 1); border: 1px solid var(--cream-3); background: rgba(255, 255, 255, .45); }
.col h3 { margin-bottom: calc(var(--u) * 1.4); }
.col-chat h3 { color: var(--ink-3); }
.col-agent { border-color: var(--gold-2); background: linear-gradient(180deg, rgba(201, 162, 39, .12), rgba(201, 162, 39, .04)); }
.col-agent h3 { color: var(--gold); }
.steps li { display: flex; align-items: baseline; gap: calc(var(--u) * 1.1); font-size: calc(var(--u) * 1.9); padding: calc(var(--u) * .55) 0; }
.steps .n { font-family: var(--serif); font-size: calc(var(--u) * 1.4); color: var(--gold); min-width: 1.4em; }
.col-chat .steps .n { color: var(--ink-3); }
.col .muted { margin-top: calc(var(--u) * 1.2); font-style: italic; font-family: var(--serif); font-size: calc(var(--u) * 1.7); }

/* ---------- Slide 2 · Models ---------- */
.models { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: calc(var(--u) * 2); }
.model { position: relative; padding: calc(var(--u) * 2.2) calc(var(--u) * 2.2) calc(var(--u) * 2); border-radius: calc(var(--u) * 1); border: 1px solid var(--cream-3); background: rgba(255, 255, 255, .45); }
.model.is-hero { border-color: var(--gold-2); background: linear-gradient(180deg, rgba(201, 162, 39, .14), rgba(201, 162, 39, .04)); box-shadow: 0 24px 50px -30px rgba(166, 124, 27, .5); }
.model-tag { position: absolute; top: calc(var(--u) * -1.1); left: calc(var(--u) * 2); background: var(--ink); color: var(--gold-3); font-size: calc(var(--u) * 1); text-transform: uppercase; letter-spacing: .12em; font-weight: 600; padding: .35em .8em; border-radius: 999px; }
.model h3 { font-size: calc(var(--u) * 2.5); }
.model-role { font-family: var(--serif); font-style: italic; color: var(--gold); font-size: calc(var(--u) * 1.7); margin: .3em 0 1em; }
.model ul li { position: relative; padding-left: 1.1em; font-size: calc(var(--u) * 1.5); line-height: 1.4; margin-bottom: .55em; color: var(--ink-2); }
.model ul li::before { content: ""; position: absolute; left: 0; top: .62em; width: .4em; height: .4em; border-radius: 50%; background: var(--gold-2); }

/* ---------- Slide 3 · Capability map ---------- */
.caps { display: grid; grid-template-columns: repeat(5, 1fr); gap: calc(var(--u) * 1.4); align-items: stretch; }
.cap { padding: calc(var(--u) * 2) calc(var(--u) * 1.7); border-radius: calc(var(--u) * 1); border: 1px solid var(--cream-3); background: rgba(255, 255, 255, .5); display: flex; flex-direction: column; }
.cap .ic { width: calc(var(--u) * 2.6); height: calc(var(--u) * 2.6); color: var(--gold); margin-bottom: calc(var(--u) * 1.3); }
.cap h3 { font-size: calc(var(--u) * 2); margin-bottom: .5em; }
.cap p { font-size: calc(var(--u) * 1.35); line-height: 1.45; color: var(--ink-2); }
.cap-eg { margin-top: auto; padding-top: calc(var(--u) * 1.2); font-family: var(--serif); font-style: italic; color: var(--gold) !important; font-size: calc(var(--u) * 1.4) !important; }

/* ---------- Slide 4 · Stack ---------- */
.stack { display: flex; flex-direction: column; gap: calc(var(--u) * .7); position: relative; }
.stack::before { content: ""; position: absolute; left: calc(var(--u) * 2.4); top: calc(var(--u) * 1); bottom: calc(var(--u) * 1); width: 1px; background: var(--gold-2); opacity: .6; }
.layer {
  position: relative; display: grid; grid-template-columns: calc(var(--u) * 22) 1fr calc(var(--u) * 22);
  align-items: center; gap: calc(var(--u) * 2);
  padding: calc(var(--u) * 1) calc(var(--u) * 2) calc(var(--u) * 1) calc(var(--u) * 4.4);
  border: 1px solid var(--cream-3); border-radius: calc(var(--u) * .8); background: rgba(255, 255, 255, .5);
}
.layer::before { content: ""; position: absolute; left: calc(var(--u) * 1.95); top: 50%; width: calc(var(--u) * .9); height: calc(var(--u) * .9); border-radius: 50%; background: var(--cream); border: 2px solid var(--gold-2); transform: translateY(-50%); }
.layer.is-core { border-color: var(--gold-2); background: linear-gradient(90deg, rgba(201, 162, 39, .16), rgba(201, 162, 39, .05)); }
.layer.is-core::before { background: var(--gold-2); }
.layer.is-gate { border-color: var(--ink); background: var(--ink); color: var(--cream); }
.layer.is-gate::before { background: var(--ink); border-color: var(--gold-3); }
.layer.is-gate .layer-note { color: var(--gold-3); }
.layer-k { font-family: var(--serif); font-size: calc(var(--u) * 2); }
.layer-v { font-size: calc(var(--u) * 1.5); color: inherit; }
.layer-note { font-size: calc(var(--u) * 1.2); color: var(--ink-3); text-align: right; font-style: italic; font-family: var(--serif); }
.layer.is-core .layer-k { color: var(--gold); }

/* ---------- Slide 5 · Demo transcript ---------- */
.slide-demo { padding-top: calc(var(--u) * 4.2); padding-bottom: calc(var(--u) * 4.8); }
.slide-demo h2 { font-size: calc(var(--u) * 3.6); margin-bottom: calc(var(--u) * 1.2); }
.slide-demo .eyebrow { margin-bottom: calc(var(--u) * 1); }
.demo-grid { display: grid; grid-template-columns: 1fr calc(var(--u) * 25); gap: calc(var(--u) * 2.2); min-height: 0; flex: 1; }
.thread { display: flex; flex-direction: column; gap: calc(var(--u) * .55); min-height: 0; overflow: auto; padding-right: calc(var(--u) * .5); scrollbar-width: thin; }
.msg { border-radius: calc(var(--u) * .9); padding: calc(var(--u) * .75) calc(var(--u) * 1.3); font-size: calc(var(--u) * 1.24); line-height: 1.4; }
.msg .who { display: flex; align-items: center; gap: .4em; font-size: calc(var(--u) * 1); text-transform: uppercase; letter-spacing: .12em; font-weight: 600; color: var(--ink-3); margin-bottom: .35em; }
.msg-user { background: var(--ink); color: var(--cream); margin-left: calc(var(--u) * 3); border-bottom-right-radius: calc(var(--u) * .2); }
.msg-user .who { color: var(--gold-3); }
.msg-agent { background: rgba(255, 255, 255, .6); border: 1px solid var(--cream-3); margin-right: calc(var(--u) * 6); border-bottom-left-radius: calc(var(--u) * .2); }
.msg-agent .who { color: var(--gold); }
.plan { counter-reset: plan; display: grid; grid-template-columns: 1fr 1fr; column-gap: calc(var(--u) * 1.4); }
.plan li { display: flex; gap: .5em; padding: .1em 0; }
.plan li::before { content: counter(plan) "."; counter-increment: plan; color: var(--gold); font-family: var(--serif); min-width: 1em; }
.calls { display: flex; flex-direction: column; gap: calc(var(--u) * .3); margin-right: calc(var(--u) * 6); }
.call { display: grid; grid-template-columns: auto calc(var(--u) * 7.5) 1fr auto; align-items: center; gap: calc(var(--u) * 1); padding: calc(var(--u) * .38) calc(var(--u) * 1.1); border: 1px solid var(--cream-3); border-radius: calc(var(--u) * .6); background: rgba(255, 255, 255, .55); font-size: calc(var(--u) * 1.22); }
.call .ic { color: var(--gold); }
.call-app { font-weight: 600; letter-spacing: .02em; }
.call-what { color: var(--ink-2); }
.call-status { font-size: calc(var(--u) * 1); text-transform: uppercase; letter-spacing: .1em; font-weight: 600; padding: .3em .7em; border-radius: 999px; }
.call-status.ok { color: var(--green); background: rgba(63, 125, 78, .12); }
.call-status.hold { color: var(--gold); background: var(--gold-soft); }
.call.is-gate { border-color: var(--gold-2); background: var(--gold-soft); }
.demo-side { display: flex; flex-direction: column; padding: calc(var(--u) * 2) calc(var(--u) * 2); border-radius: calc(var(--u) * 1); background: var(--cream-2); border: 1px solid var(--cream-3); }
.demo-side h3 { font-size: calc(var(--u) * 2); margin-bottom: calc(var(--u) * 1.2); }
.ticks li { position: relative; padding-left: 1.6em; font-size: calc(var(--u) * 1.45); line-height: 1.4; margin-bottom: .8em; color: var(--ink-2); }
.ticks li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--gold); font-weight: 700; }
.demo-side .tag { margin-top: auto; align-self: flex-start; }

/* ---------- Slide 6 · Timeline ---------- */
.timeline { margin-top: calc(var(--u) * 1); }
.tl-row { display: grid; grid-template-columns: calc(var(--u) * 9) 1fr; align-items: center; gap: calc(var(--u) * 1.5); }
.tl-label { font-family: var(--serif); font-size: calc(var(--u) * 1.9); color: var(--ink-2); }
.tl-you .tl-track { position: relative; height: calc(var(--u) * 3.4); border-radius: 999px; background: var(--cream-2); border: 1px solid var(--cream-3); }
.tl-block { position: absolute; top: 0; bottom: 0; left: calc(var(--from) / 24 * 100%); width: calc((var(--to) - var(--from)) / 24 * 100%); border-radius: 999px; background: var(--ink); color: var(--cream); display: flex; align-items: center; justify-content: center; font-size: calc(var(--u) * 1.2); letter-spacing: .04em; }
.tl-agent { margin-top: calc(var(--u) * 1.2); }
.tl-agent .tl-track { position: relative; height: calc(var(--u) * 15); }
.tl-agent .tl-track::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: calc(var(--u) * 1.1); transform: translateY(-50%); border-radius: 999px; background: linear-gradient(90deg, var(--gold-2), var(--gold-3), var(--gold-2)); opacity: .55; }
.tl-mark { position: absolute; left: calc(var(--at) / 24 * 100%); width: calc(var(--u) * 21); font-size: calc(var(--u) * 1.3); line-height: 1.35; color: var(--ink-2); }
.tl-mark b { display: block; font-family: var(--serif); font-weight: 500; font-size: calc(var(--u) * 1.7); color: var(--ink); }
.tl-mark small { display: block; font-size: calc(var(--u) * 1.15); color: var(--ink-3); margin-top: .15em; }
.tl-mark::before { content: ""; position: absolute; left: 0; width: calc(var(--u) * 1.4); height: calc(var(--u) * 1.4); border-radius: 50%; background: var(--gold); border: 3px solid var(--cream); box-shadow: 0 0 0 1px var(--gold); }
.tl-mark::after { content: ""; position: absolute; left: calc(var(--u) * .65); width: 1px; background: var(--gold); opacity: .6; }
.tl-mark:nth-child(odd) { top: 0; padding-left: calc(var(--u) * 2); }
.tl-mark:nth-child(odd)::before { top: calc(var(--u) * 6.8); }
.tl-mark:nth-child(odd)::after { top: calc(var(--u) * 3.6); height: calc(var(--u) * 3.4); }
.tl-mark:nth-child(even) { bottom: 0; padding-left: calc(var(--u) * 2); }
.tl-mark:nth-child(even)::before { bottom: calc(var(--u) * 6.8); }
.tl-mark:nth-child(even)::after { bottom: calc(var(--u) * 3.6); height: calc(var(--u) * 3.6); }
.tl-hours { display: flex; justify-content: space-between; margin-left: calc(var(--u) * 10.5); font-size: calc(var(--u) * 1.05); color: var(--ink-3); letter-spacing: .08em; margin-top: calc(var(--u) * .4); }
.rules { margin-top: auto; display: grid; grid-template-columns: repeat(5, 1fr); gap: calc(var(--u) * 1.2); padding-top: calc(var(--u) * 1.6); border-top: 1px solid var(--cream-3); }
.rule { display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; column-gap: .6em; align-items: center; font-size: calc(var(--u) * 1.25); color: var(--ink-3); }
.rule .ic { grid-row: 1 / span 2; color: var(--gold); width: calc(var(--u) * 2.2); height: calc(var(--u) * 2.2); }
.rule b { font-size: calc(var(--u) * 1.5); color: var(--ink); }

/* ---------- Slide 7 · Family ---------- */
.flow3 { display: grid; grid-template-columns: 1fr calc(var(--u) * 24) 1fr; gap: calc(var(--u) * 2.4); align-items: center; }
.flow-col h3 { font-size: calc(var(--u) * 1.9); margin-bottom: calc(var(--u) * 1); color: var(--ink-3); }
.chips li { display: flex; align-items: center; gap: .6em; padding: calc(var(--u) * .6) calc(var(--u) * 1.1); margin-bottom: calc(var(--u) * .5); border: 1px solid var(--cream-3); border-radius: calc(var(--u) * .7); background: rgba(255, 255, 255, .55); font-size: calc(var(--u) * 1.4); }
.chips .ic { color: var(--gold); }
.flow-core { position: relative; text-align: center; padding: calc(var(--u) * 2) calc(var(--u) * 1.6); border-radius: calc(var(--u) * 1.2); background: var(--ink); color: var(--cream); }
.core-badge { display: inline-flex; align-items: center; gap: .5em; font-family: var(--serif); font-size: calc(var(--u) * 2.1); color: var(--gold-3); margin-bottom: .5em; }
.flow-core p { font-size: calc(var(--u) * 1.2); color: rgba(255, 253, 247, .75); line-height: 1.4; }
.flow-arrow { position: absolute; top: 50%; width: calc(var(--u) * 2); height: calc(var(--u) * 2); transform: translateY(-50%); color: var(--gold-2); stroke-width: 1.4; }
.flow-arrow-l { left: calc(var(--u) * -2.2); }
.flow-arrow-r { right: calc(var(--u) * -2.2); }
.brief-card { margin-top: calc(var(--u) * 1.6); padding: calc(var(--u) * 1) calc(var(--u) * 1.6); border-left: 3px solid var(--gold-2); background: var(--cream-2); border-radius: 0 calc(var(--u) * .8) calc(var(--u) * .8) 0; font-size: calc(var(--u) * 1.4); line-height: 1.45; color: var(--ink-2); }
.brief-card .who { display: block; font-size: calc(var(--u) * 1.05); text-transform: uppercase; letter-spacing: .12em; font-weight: 600; color: var(--gold); margin-bottom: .4em; }

/* ---------- Split layouts (scene + text) ---------- */
.split { display: grid; grid-template-columns: 42% 1fr; gap: calc(var(--u) * 3); flex: 1; min-height: 0; margin: calc(var(--u) * -2) 0 calc(var(--u) * -2) calc(var(--u) * -3); }
.split-wide { grid-template-columns: 52% 1fr; }
.split-scene { position: relative; min-height: 0; }
.split-text { display: flex; flex-direction: column; justify-content: center; min-height: 0; }
.split-text h2 { font-size: calc(var(--u) * 3.7); margin-bottom: calc(var(--u) * 1.6); }
.split-text .lead { font-size: calc(var(--u) * 1.6); margin-bottom: calc(var(--u) * 1.6); }
.lbl { position: absolute; font-size: calc(var(--u) * 1.15); text-transform: uppercase; letter-spacing: .14em; font-weight: 600; color: var(--gold-3); }
.lbl small { display: block; text-transform: none; letter-spacing: 0; font-weight: 400; color: rgba(255, 253, 247, .6); font-size: calc(var(--u) * 1.05); margin-top: .2em; }
.lbl-l { left: 6%; bottom: 8%; }
.lbl-c { left: 50%; transform: translateX(-50%); top: 6%; text-align: center; }
.lbl-r { right: 6%; bottom: 8%; text-align: right; }

/* ---------- Slide 8 · Security ---------- */
.gate-steps { display: flex; flex-direction: column; gap: calc(var(--u) * .55); counter-reset: gs; }
.gate-steps li { display: grid; grid-template-columns: auto calc(var(--u) * 8) 1fr; gap: calc(var(--u) * 1); align-items: baseline; font-size: calc(var(--u) * 1.4); line-height: 1.38; color: rgba(255, 253, 247, .82); }
.gate-steps li::before { content: counter(gs); counter-increment: gs; font-family: var(--serif); color: var(--gold-2); font-size: calc(var(--u) * 1.5); }
.gate-steps b { color: var(--cream); font-family: var(--serif); font-weight: 500; font-size: calc(var(--u) * 1.75); }
.code-note { margin-top: calc(var(--u) * 1.6); padding: calc(var(--u) * 1.1) calc(var(--u) * 1.5); border: 1px solid rgba(201, 162, 39, .4); border-radius: calc(var(--u) * .8); background: rgba(255, 253, 247, .04); display: grid; gap: .35em; }
.code-label, .code-foot { font-size: calc(var(--u) * 1.05); text-transform: uppercase; letter-spacing: .12em; color: var(--gold-2); font-weight: 600; }
.code-foot { text-transform: none; letter-spacing: 0; font-weight: 400; color: rgba(255, 253, 247, .65); }
.code-note code { font-size: calc(var(--u) * 1.5); color: var(--cream); }
.code-note code b { color: var(--gold-3); font-weight: 600; }

/* ---------- Slide 9 · Ladder ---------- */
.ladder { display: grid; grid-template-columns: repeat(3, 1fr); gap: calc(var(--u) * 1.8); align-items: end; }
.rung { padding: calc(var(--u) * 2) calc(var(--u) * 2.2); border-radius: calc(var(--u) * 1); border: 1px solid var(--cream-3); background: rgba(255, 255, 255, .5); }
.rung-1 { min-height: calc(var(--u) * 24); }
.rung-2 { min-height: calc(var(--u) * 27); border-color: var(--gold-2); background: linear-gradient(180deg, rgba(201, 162, 39, .14), rgba(201, 162, 39, .04)); }
.rung-3 { min-height: calc(var(--u) * 30); background: var(--ink); color: var(--cream); border-color: var(--ink); }
.rung-n { font-size: calc(var(--u) * 1.05); text-transform: uppercase; letter-spacing: .14em; font-weight: 600; color: var(--gold); }
.rung h3 { margin: .3em 0 .8em; font-size: calc(var(--u) * 2.3); }
.rung ul li { position: relative; padding-left: 1.1em; font-size: calc(var(--u) * 1.45); line-height: 1.4; margin-bottom: .5em; color: var(--ink-2); }
.rung ul li::before { content: ""; position: absolute; left: 0; top: .6em; width: .4em; height: .4em; border-radius: 50%; background: var(--gold-2); }
.rung-3 ul li { color: rgba(255, 253, 247, .85); }
.rung-3 ul li::before { background: var(--red); }
.rung-3 .rung-n { color: var(--gold-3); }

/* ---------- Slide 10 · Workflows ---------- */
.wf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: calc(var(--u) * 2.4); }
.wf { padding: calc(var(--u) * 1.8) calc(var(--u) * 2.2); border-radius: calc(var(--u) * 1); border: 1px solid var(--cream-3); background: rgba(255, 255, 255, .5); }
.wf header { display: flex; align-items: baseline; gap: .6em; margin-bottom: calc(var(--u) * 1.2); padding-bottom: calc(var(--u) * .9); border-bottom: 1px solid var(--cream-3); }
.wf header .ic { color: var(--gold); width: calc(var(--u) * 2.2); height: calc(var(--u) * 2.2); align-self: center; }
.wf header h3 { font-size: calc(var(--u) * 2.4); }
.wf header span { font-family: var(--serif); font-style: italic; color: var(--gold); font-size: calc(var(--u) * 1.6); }
.wf ol { counter-reset: wf; display: flex; flex-direction: column; gap: calc(var(--u) * .9); }
.wf ol li { display: grid; grid-template-columns: auto 1fr; column-gap: calc(var(--u) * 1); align-items: baseline; }
.wf ol li::before { content: counter(wf, decimal-leading-zero); counter-increment: wf; font-family: var(--serif); color: var(--gold); font-size: calc(var(--u) * 1.4); grid-row: 1 / span 2; }
.wf ol b { font-size: calc(var(--u) * 1.65); font-family: var(--serif); font-weight: 500; }
.wf ol span { font-size: calc(var(--u) * 1.35); color: var(--ink-2); line-height: 1.4; }
.guard { margin-top: auto; display: flex; align-items: center; gap: calc(var(--u) * 1.2); padding: calc(var(--u) * 1.2) calc(var(--u) * 1.8); border-radius: calc(var(--u) * .9); background: var(--ink); color: var(--cream); font-size: calc(var(--u) * 1.45); }
.guard .ic { color: var(--gold-3); width: calc(var(--u) * 2.6); height: calc(var(--u) * 2.6); }
.guard b { color: var(--gold-3); }

/* ---------- Slide 11 · Orchestration ---------- */
.roles { display: flex; flex-direction: column; gap: calc(var(--u) * .9); }
.roles li { display: grid; grid-template-columns: calc(var(--u) * 11) 1fr; gap: calc(var(--u) * 1); align-items: baseline; padding: calc(var(--u) * .7) 0; border-bottom: 1px solid var(--cream-3); }
.roles b { font-family: var(--serif); font-weight: 500; font-size: calc(var(--u) * 1.9); color: var(--gold); }
.roles span { font-size: calc(var(--u) * 1.4); color: var(--ink-2); line-height: 1.4; }
.slide-orchestration .kicker { margin-top: calc(var(--u) * 1.4); border-top: 0; padding-top: 0; font-size: calc(var(--u) * 2); }

/* ---------- Slide 12 · Handoff ---------- */
.slide-handoff { align-items: center; justify-content: center; text-align: center; }
.slide-handoff .scene { z-index: 0; }
.handoff { position: relative; z-index: 1; max-width: calc(var(--u) * 74); padding: calc(var(--u) * 4) calc(var(--u) * 6); }
.handoff::before { content: ""; position: absolute; z-index: -1; inset: calc(var(--u) * -6) calc(var(--u) * -10); background: radial-gradient(ellipse at 50% 50%, rgba(23, 21, 15, .92) 25%, rgba(23, 21, 15, .7) 50%, rgba(23, 21, 15, 0) 72%); }
.handoff .eyebrow { justify-content: center; }
.handoff .eyebrow::before { display: none; }
.handoff h2 { font-size: calc(var(--u) * 7.2); margin: 0 0 calc(var(--u) * .6); max-width: none; text-shadow: 0 0 calc(var(--u) * 4) rgba(23, 21, 15, .9); }
.handoff .lead { margin: 0 auto; font-size: calc(var(--u) * 2.4); color: var(--gold-3); }
.handoff-apps { display: flex; justify-content: center; gap: calc(var(--u) * 1); margin: calc(var(--u) * 2.2) 0; }
.handoff-apps span { font-size: calc(var(--u) * 1.2); text-transform: uppercase; letter-spacing: .14em; font-weight: 600; color: var(--cream); border: 1px solid rgba(201, 162, 39, .6); padding: .5em 1.1em; border-radius: 999px; background: rgba(23, 21, 15, .6); }
.handoff-bridge { font-family: var(--serif); font-size: calc(var(--u) * 1.9); line-height: 1.45; color: rgba(255, 253, 247, .85); max-width: calc(var(--u) * 58); margin: 0 auto; text-shadow: 0 0 calc(var(--u) * 2) rgba(23, 21, 15, .9); }
.handoff-bridge em { color: var(--gold-2); }

/* ---------- Slide 13 · Takeaways ---------- */
.todo { counter-reset: td; display: flex; flex-direction: column; gap: calc(var(--u) * .25); }
.todo li { display: grid; grid-template-columns: calc(var(--u) * 4) 1fr; align-items: baseline; padding: calc(var(--u) * .5) 0; border-bottom: 1px solid var(--cream-3); }
.todo li::before { content: counter(td, decimal-leading-zero); counter-increment: td; font-family: var(--serif); color: var(--gold); font-size: calc(var(--u) * 1.9); grid-row: 1 / span 2; }
.todo b { font-family: var(--serif); font-weight: 500; font-size: calc(var(--u) * 1.9); display: block; grid-column: 2; }
.todo span { font-size: calc(var(--u) * 1.3); color: var(--ink-3); grid-column: 2; }
.closing { margin-top: auto; padding-top: calc(var(--u) * 1.2); display: flex; align-items: baseline; gap: calc(var(--u) * 2); }
.closing-line { font-family: var(--serif); font-style: italic; font-size: calc(var(--u) * 3.2); color: var(--gold); }
.closing .muted { font-size: calc(var(--u) * 1.4); }

/* ---------- Chrome ---------- */
.chrome { position: fixed; left: 0; right: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; padding: 0 calc(var(--u) * 2.4); pointer-events: none; color: var(--ink-3); font-size: calc(var(--u) * 1.05); letter-spacing: .1em; text-transform: uppercase; font-weight: 600; transition: color .4s; }
.chrome > * { pointer-events: auto; }
.chrome-top { top: 0; height: calc(var(--u) * 4.2); }
.chrome-bottom { bottom: 0; height: calc(var(--u) * 4.6); }
.deck.is-dark .chrome { color: rgba(255, 253, 247, .6); }
.brand { display: inline-flex; align-items: center; gap: .7em; }
.brand-mark { width: calc(var(--u) * 2); height: calc(var(--u) * 2); color: var(--gold); fill: none; stroke: currentColor; stroke-width: 1.8; }
.brand-text em { font-style: normal; font-weight: 400; opacity: .8; margin-left: .4em; }
.progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 21; background: transparent; }
.progress-bar { height: 100%; width: 0; background: var(--gold-2); transition: width .5s var(--ease); }
.nav-arrows { display: flex; gap: .4em; }
.nav-btn { width: calc(var(--u) * 2.6); height: calc(var(--u) * 2.6); display: grid; place-items: center; border-radius: 50%; border: 1px solid currentColor; opacity: .55; transition: opacity .2s, background .2s; }
.nav-btn .ic { width: 55%; height: 55%; }
.nav-btn:hover { opacity: 1; background: var(--gold-soft); }
.nav-btn[disabled] { opacity: .2; cursor: default; }
.dots { display: flex; gap: calc(var(--u) * .55); align-items: center; }
.dot { width: calc(var(--u) * .7); height: calc(var(--u) * .7); border-radius: 50%; background: currentColor; opacity: .3; transition: transform .25s var(--ease), opacity .25s, background .25s; padding: 0; }
.dot:hover { opacity: .7; }
.dot[aria-current="true"] { background: var(--gold-2); opacity: 1; transform: scale(1.5); }
.counter { font-variant-numeric: tabular-nums; min-width: 5em; text-align: right; }

/* ---------- Overview (Esc) ---------- */
.deck.is-overview .stage {
  perspective: none; overflow: auto; display: grid;
  grid-template-columns: repeat(4, calc(var(--sw) * var(--ov-s)));
  grid-auto-rows: calc(var(--sh) * var(--ov-s));
  gap: calc(var(--u) * 1.4); justify-content: center; align-content: start;
  padding: calc(var(--u) * 5) calc(var(--u) * 2) calc(var(--u) * 6);
}
.deck.is-overview .slide {
  position: relative; inset: auto; width: var(--sw); height: var(--sh); min-width: 0;
  transform: scale(var(--ov-s)) !important; transform-origin: 0 0;
  opacity: 1 !important; visibility: visible !important; transition: none; cursor: pointer;
  outline: 1px solid var(--cream-3); box-shadow: 0 30px 60px -30px rgba(23, 21, 15, .35);
}
.deck.is-overview .slide.is-active { outline: calc(var(--u) * 1.3) solid var(--gold-2); }
.deck.is-overview .slide .fragment, .deck.is-overview .slide .stagger > * { opacity: 1; transform: none; transition: none; }
.deck.is-overview .slide-num { display: block; position: absolute; left: calc(var(--u) * 2.5); top: calc(var(--u) * 1.5); font-family: var(--serif); font-size: calc(var(--u) * 6); color: var(--gold-2); opacity: .9; z-index: 5; }
.deck.is-overview .chrome-bottom .nav-arrows { visibility: hidden; }

/* ---------- Notes panel ---------- */
.notes-panel {
  position: fixed; right: calc(var(--u) * 1.6); bottom: calc(var(--u) * 5.6); z-index: 40;
  width: min(36vw, 620px); max-height: 62vh; display: flex; flex-direction: column;
  background: var(--ink); color: var(--cream); border-radius: 14px; border: 1px solid rgba(201, 162, 39, .35);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .55); font-size: 15px; line-height: 1.5;
}
.notes-head { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-bottom: 1px solid rgba(255, 253, 247, .12); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--gold-3); font-weight: 600; }
.notes-head #notesMeta { flex: 1; }
.notes-timer { font-variant-numeric: tabular-nums; color: var(--cream); font-size: 14px; }
.notes-close { font-size: 20px; line-height: 1; width: 28px; height: 28px; border-radius: 50%; color: var(--cream); opacity: .7; }
.notes-close:hover { opacity: 1; background: rgba(255, 253, 247, .1); }
.notes-body { padding: 14px 16px 18px; overflow: auto; }
.notes-body p { margin: 0 0 .7em; }
.notes-body p:last-child { margin: 0; }
.notes-body strong { color: var(--gold-3); }
.notes-body em { color: var(--gold-3); font-style: italic; }

/* ---------- Toast + overlays ---------- */
.toast { position: fixed; left: 50%; bottom: calc(var(--u) * 6.4); transform: translateX(-50%); z-index: 45; background: var(--ink); color: var(--cream); font-size: 13px; letter-spacing: .06em; padding: .6em 1.1em; border-radius: 999px; box-shadow: 0 10px 30px -10px rgba(0, 0, 0, .4); }
.overlay { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; background: rgba(23, 21, 15, .55); backdrop-filter: blur(4px); }
.overlay-card { width: min(560px, 90vw); background: var(--cream); color: var(--ink); border-radius: 16px; padding: 28px 32px; box-shadow: 0 40px 100px -30px rgba(0, 0, 0, .6); font-size: 15px; }
.overlay-card h3 { font-size: 26px; margin-bottom: 14px; }
.keys { display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; align-items: center; margin: 0; }
.keys dt { white-space: nowrap; }
.keys dd { margin: 0; color: var(--ink-2); }
.keys kbd { font-size: 12px; }
.overlay-foot { margin-top: 16px; color: var(--ink-3); font-size: 13px; }
.overlay-foot code { background: var(--cream-2); padding: .1em .4em; border-radius: 4px; }
.overlay-close { margin-top: 18px; padding: .55em 1.2em; border-radius: 999px; background: var(--ink); color: var(--cream); font-weight: 600; font-size: 13px; letter-spacing: .06em; }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  .slide, .slide.is-prev, .slide.is-next { transition: opacity .3s linear, visibility 0s linear .3s; transform: none !important; }
  .slide.is-active { transition-delay: 0s; }
  .fragment, .stagger > * { transition: opacity .2s linear !important; transform: none !important; transition-delay: 0s !important; }
  .progress-bar, .dot { transition: none; }
}
.deck.no-motion .slide, .deck.no-motion .slide.is-prev, .deck.no-motion .slide.is-next { transition: opacity .3s linear, visibility 0s linear .3s; transform: none !important; }
.deck.no-motion .slide.is-active { transition-delay: 0s; }
.deck.no-motion .fragment, .deck.no-motion .stagger > * { transition: opacity .2s linear !important; transform: none !important; transition-delay: 0s !important; }

/* ---------- Mobile-ish: stack mode (narrow screens) ---------- */
@media (max-width: 720px) {
  :root { --u: 2.45vw; }
  html, body { height: auto; overflow: auto; }
  body { overflow-x: hidden; }
  .deck { position: static; display: block; height: auto; }
  .stage-clip { width: auto; height: auto; overflow: visible; }
  .stage { position: static; perspective: none; }
  .slide { position: relative; inset: auto; min-height: 100svh; padding: 14vw 6vw 12vw; opacity: 1 !important; visibility: visible !important; transform: none !important; transition: none; border-bottom: 1px solid var(--cream-3); }
  .fragment, .stagger > * { opacity: 1 !important; transform: none !important; }
  h1 { font-size: 10vw; }
  h2 { font-size: 7.5vw; max-width: none; }
  .lead { font-size: 4.4vw; }
  .compare, .models, .caps, .wf-grid, .ladder, .flow3, .rules { grid-template-columns: 1fr; }
  .layer { grid-template-columns: 1fr; gap: .2em; }
  .layer-note { text-align: left; }
  .demo-grid { grid-template-columns: 1fr; }
  .thread { overflow: visible; }
  .msg-user, .msg-agent, .calls { margin-left: 0; margin-right: 0; }
  .call { grid-template-columns: auto 1fr auto; }
  .call-app { grid-column: 2; }
  .call-what { grid-column: 1 / -1; }
  .tl-agent .tl-track { height: calc(var(--u) * 26); }
  .tl-mark { width: calc(var(--u) * 24); }
  .split, .split-wide { grid-template-columns: 1fr; margin: 0; }
  .split-scene { height: 56vw; }
  .split-text h2 { font-size: 7.5vw; }
  .slide-title .scene, .slide-handoff .scene { position: absolute; }
  .title-wrap::before { inset: -6vw; }
  .flow-arrows { display: none; }
  .kicker, .footnote, .rules, .guard, .closing { margin-top: 6vw; }
  .chrome-bottom .dots, .chrome-bottom .nav-arrows { display: none; }
  .chrome { position: fixed; background: rgba(255, 253, 247, .9); backdrop-filter: blur(6px); font-size: 10px; }
  .chrome-top { height: 40px; }
  .chrome-right, .brand-text em { display: none; }
  .chrome-bottom { height: 36px; justify-content: flex-end; }
  .notes-panel { right: 3vw; left: 3vw; width: auto; bottom: 44px; }
  .deck.is-overview .stage { display: block; padding: 0; }
  .deck.is-overview .slide { width: auto; height: auto; transform: none !important; }
}

/* ---------- Print: one slide per page ---------- */
@media print {
  html, body { height: auto; overflow: visible; background: #fff; }
  :root { --sw: 10in; --sh: 5.625in; }
  .deck { position: static; display: block; }
  .stage-clip { width: auto; height: auto; overflow: visible; }
  .stage { position: static; perspective: none; }
  .slide { position: relative; inset: auto; width: var(--sw); height: var(--sh); opacity: 1 !important; visibility: visible !important; transform: none !important; page-break-after: always; break-after: page; border: 0; }
  .fragment, .stagger > * { opacity: 1 !important; transform: none !important; }
  .scene, .chrome, .progress, .notes-panel, .overlay, .toast, .hint, .hint-inline { display: none !important; }
  .notes { display: block; position: absolute; left: 0; right: 0; top: 100%; font-size: 10pt; padding: 8pt 0; color: #333; }
}