:root {
  --ink: #18201f;
  --muted: #55615f;
  --paper: #f8f6ef;
  --panel: #ffffff;
  --line: #dfe4df;
  --teal: #0f766e;
  --blue: #315f9a;
  --coral: #c9564a;
  --gold: #d6a339;
  --shadow: 0 24px 70px rgba(24, 32, 31, 0.16);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.12), transparent 34%),
    linear-gradient(225deg, rgba(201, 86, 74, 0.12), transparent 40%),
    var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
}

.deck {
  width: 100vw;
  height: 100svh;
  display: grid;
  place-items: center;
}

.slide {
  display: none;
  width: min(100vw, 177.7778svh);
  height: min(56.25vw, 100svh);
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4.1vmin, 3.7rem);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.92)),
    radial-gradient(circle at 14% 12%, rgba(214, 163, 57, 0.14), transparent 25rem);
  border: 1px solid rgba(24, 32, 31, 0.08);
  box-shadow: var(--shadow);
}

.slide.active {
  display: block;
}

.slide::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 0.45rem;
  background: linear-gradient(90deg, var(--teal), var(--gold), var(--blue), var(--coral));
}

.slide-number {
  position: absolute;
  top: clamp(1rem, 2vmin, 1.5rem);
  right: clamp(1rem, 2vmin, 1.5rem);
  color: var(--muted);
  font-size: clamp(0.74rem, 1.45vmin, 1rem);
  font-weight: 800;
}

.title-layout,
.two-column,
.design-layout,
.chart-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: clamp(1.5rem, 4vw, 4.4rem);
  align-items: center;
}

.title-layout {
  height: 100%;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--teal);
  font-size: clamp(0.82rem, 1.7vmin, 1.15rem);
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 870px;
  margin-bottom: 1.1rem;
  font-size: clamp(2.6rem, 8.7vmin, 6.35rem);
  line-height: 0.96;
}

h2 {
  max-width: 1080px;
  margin-bottom: clamp(1.25rem, 3vmin, 2.25rem);
  font-size: clamp(2rem, 5.85vmin, 4.55rem);
  line-height: 1.02;
}

h3 {
  margin-bottom: 0.7rem;
  font-size: clamp(1.05rem, 2.25vmin, 1.55rem);
}

p,
li,
.publication-box span,
.problem-stack span,
.metrics span,
.callout span {
  color: var(--muted);
  font-size: clamp(0.94rem, 2vmin, 1.35rem);
  line-height: 1.38;
}

ul {
  margin: 0;
  padding-left: 1.15rem;
}

li + li {
  margin-top: 0.6rem;
}

.subtitle {
  max-width: 820px;
  font-size: clamp(1.18rem, 2.55vmin, 1.75rem);
}

.authors {
  color: #283332;
  font-size: clamp(1rem, 2.05vmin, 1.38rem);
  font-weight: 800;
}

.meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.meta-strip span,
.takeaway {
  border: 1px solid rgba(15, 118, 110, 0.18);
  background: #edf7f4;
  color: #164a45;
  font-size: clamp(0.82rem, 1.55vmin, 1.05rem);
  font-weight: 800;
}

.meta-strip span {
  padding: 0.7rem 0.95rem;
}

.link-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.05rem;
}

.link-buttons a {
  display: inline-block;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-size: clamp(0.82rem, 1.55vmin, 1.05rem);
  font-weight: 900;
  padding: 0.72rem 0.98rem;
  text-decoration: none;
}

.link-buttons a:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.link-buttons.compact {
  margin-top: 0.2rem;
}

.hero-card {
  height: min(58vmin, 540px);
  min-height: 340px;
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, #eef9f7, #fff7df 52%, #f8e8e5);
  position: relative;
  overflow: hidden;
}

.screen-visual {
  position: absolute;
  inset: 7%;
  border: clamp(10px, 1.6vmin, 16px) solid #24312f;
  background: rgba(255, 255, 255, 0.72);
}

.node {
  position: absolute;
  width: clamp(68px, 11vmin, 116px);
  height: clamp(68px, 11vmin, 116px);
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  font-size: clamp(0.9rem, 2vmin, 1.35rem);
  font-weight: 900;
  box-shadow: 0 12px 30px rgba(24, 32, 31, 0.18);
}

.node-a {
  top: 12%;
  left: 14%;
  background: var(--teal);
}

.node-b {
  top: 14%;
  right: 12%;
  background: var(--blue);
}

.node-c {
  bottom: 12%;
  left: 12%;
  background: var(--coral);
}

.node-d {
  bottom: 16%;
  right: 16%;
  background: var(--gold);
  color: #231b08;
}

.learner {
  position: absolute;
  inset: 34% 38% 24%;
  background: #18201f;
  clip-path: polygon(50% 0, 67% 30%, 100% 38%, 74% 59%, 82% 100%, 50% 78%, 18% 100%, 26% 59%, 0 38%, 33% 30%);
}

.problem-stack,
.card-grid,
.flow,
.metrics {
  display: grid;
  gap: clamp(0.85rem, 1.8vmin, 1.35rem);
}

.problem-stack div,
.card-grid article,
.flow div,
.metrics div,
.callout,
.publication-box {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(1rem, 2.25vmin, 1.65rem);
}

.problem-stack strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink);
  font-size: clamp(1.35rem, 2.75vmin, 2rem);
}

.card-grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.card-grid.two {
  grid-template-columns: repeat(2, 1fr);
}

.takeaway {
  margin: clamp(1.3rem, 2.5vmin, 1.9rem) 0 0;
  padding: 0.95rem 1.15rem;
}

.flow {
  grid-template-columns: repeat(3, 1fr);
}

.flow span {
  display: inline-grid;
  place-items: center;
  width: clamp(2.35rem, 4vmin, 3.1rem);
  height: clamp(2.35rem, 4vmin, 3.1rem);
  margin-bottom: 0.85rem;
  background: var(--ink);
  color: #fff;
  font-size: clamp(0.82rem, 1.4vmin, 1rem);
  font-weight: 900;
}

.flow strong {
  display: block;
  margin-bottom: 0.6rem;
  font-size: clamp(1.15rem, 2.35vmin, 1.65rem);
}

.design-layout {
  grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.15fr);
}

.rings {
  height: min(50vmin, 470px);
  min-height: 300px;
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  gap: clamp(0.75rem, 1.6vmin, 1.1rem);
}

.rings div {
  position: static;
  display: grid;
  place-items: center;
  min-height: 0;
  border-radius: 8px;
  color: #fff;
  font-size: clamp(1rem, 2.2vmin, 1.45rem);
  font-weight: 900;
  box-shadow: 0 16px 35px rgba(24, 32, 31, 0.14);
}

.rings div:nth-child(1) {
  background: rgba(15, 118, 110, 0.88);
}

.rings div:nth-child(2) {
  background: rgba(49, 95, 154, 0.88);
}

.rings div:nth-child(3) {
  background: rgba(201, 86, 74, 0.92);
}

.metrics {
  grid-template-columns: repeat(4, 1fr);
}

.metrics strong,
.callout strong {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--ink);
  font-size: clamp(2.7rem, 6.8vmin, 5.25rem);
  line-height: 1;
}

.chart-layout {
  grid-template-columns: minmax(0, 1.3fr) minmax(220px, 0.7fr);
}

.bar-chart {
  display: grid;
  gap: clamp(0.78rem, 1.6vmin, 1.1rem);
}

.bar-chart div {
  --bar: calc(var(--value) * 1%);
  display: grid;
  grid-template-columns: minmax(120px, 0.55fr) minmax(80px, 1fr) auto;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  font-size: clamp(0.9rem, 1.85vmin, 1.22rem);
}

.bar-chart div::before {
  content: "";
  grid-column: 2;
  height: clamp(1rem, 2.2vmin, 1.55rem);
  background: linear-gradient(90deg, var(--teal) var(--bar), #e9eeeb var(--bar));
}

.bar-chart span {
  grid-column: 1;
  grid-row: 1;
}

.bar-chart strong {
  grid-column: 3;
  grid-row: 1;
  color: var(--ink);
}

.callout {
  border-color: rgba(201, 86, 74, 0.28);
  background: #fff5f2;
}

.publication-box {
  display: grid;
  gap: 0.62rem;
}

.publication-box strong {
  font-size: clamp(1.25rem, 2.45vmin, 1.7rem);
}

.controls {
  position: fixed;
  left: 50%;
  bottom: 0.75rem;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  transform: translateX(-50%);
  padding: 0.42rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 25px rgba(24, 32, 31, 0.12);
}

button {
  width: 2.35rem;
  height: 2.35rem;
  border: 0;
  background: var(--ink);
  color: #fff;
  font-size: 1.45rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
}

button:disabled {
  opacity: 0.35;
  cursor: default;
}

.counter {
  min-width: 3rem;
  text-align: center;
  font-size: 0.92rem;
  font-weight: 900;
}

.progress {
  position: fixed;
  inset: auto 0 0;
  z-index: 6;
  height: 0.28rem;
  background: rgba(24, 32, 31, 0.08);
}

.progress span {
  display: block;
  width: 10%;
  height: 100%;
  background: var(--teal);
  transition: width 0.18s ease;
}

@media (max-width: 720px) {
  .slide {
    width: 100vw;
    height: 100svh;
    aspect-ratio: auto;
    padding: 1rem;
  }

  .title-layout,
  .two-column,
  .design-layout,
  .chart-layout,
  .card-grid.three,
  .card-grid.two,
  .flow,
  .metrics {
    grid-template-columns: 1fr;
  }

  .hero-card,
  .rings {
    display: none;
  }

  p,
  li,
  .publication-box span,
  .problem-stack span,
  .metrics span,
  .callout span {
    font-size: 0.68rem;
    line-height: 1.28;
  }

  h1 {
    font-size: clamp(1.65rem, 8vw, 2.6rem);
  }

  h2 {
    font-size: clamp(1.25rem, 6.2vw, 2rem);
  }

  .controls {
    bottom: 0.45rem;
  }
}

@media print {
  body {
    overflow: visible;
    background: #fff;
  }

  .deck {
    display: block;
    height: auto;
  }

  .slide,
  .slide.active {
    display: block;
    width: 100vw;
    height: 56.25vw;
    page-break-after: always;
    box-shadow: none;
  }

  .controls,
  .progress {
    display: none;
  }
}