:root {
  --ink: #161616;
  --paper: #fbfaf5;
  --soft: #f0eee7;
  --muted: #595959;
  --line: #1c1c1c;
  --red: #b3261e;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.35;
}

a {
  color: inherit;
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 54px;
  padding: 0 30px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 900;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.72rem;
  font-weight: 950;
}

nav {
  display: flex;
  gap: 10px;
  align-items: center;
  white-space: nowrap;
}

nav a {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-decoration: none;
}

nav a:hover,
nav a:focus,
nav a[aria-current="true"] {
  color: var(--red);
  outline: none;
}

.deck {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 54px 0 0;
  display: grid;
  align-content: center;
  width: 100%;
  height: calc(100vh - 54px);
  padding: 46px 72px 88px;
  overflow: hidden;
  background: var(--paper);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(28px);
  transition: opacity 180ms ease, transform 240ms ease, visibility 180ms ease;
}

.slide.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(0);
}

.slide.is-exiting-back {
  transform: translateX(-28px);
}

.title-slide,
.closing-slide {
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 0.86fr);
  gap: 54px;
  align-items: center;
}

.slide-copy {
  max-width: 880px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--red);
  font-size: 0.76rem;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 920px;
  font-size: clamp(2.9rem, 4.5vw, 4.9rem);
  line-height: 0.98;
  font-weight: 950;
}

h2 {
  max-width: 1160px;
  margin-bottom: 26px;
  font-size: clamp(2.05rem, 3.35vw, 3.55rem);
  line-height: 1.03;
  font-weight: 950;
}

h3 {
  margin-bottom: 18px;
  font-size: 1rem;
  font-weight: 950;
  text-transform: uppercase;
}

.lead {
  max-width: 760px;
  margin-top: 24px;
  color: var(--ink);
  font-size: 1.25rem;
  font-weight: 650;
}

.so-what {
  position: absolute;
  left: 72px;
  right: 260px;
  bottom: 36px;
  padding-left: 12px;
  border-left: 4px solid var(--red);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 850;
}

.executive-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 30px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.executive-proof article,
.answer-sheet dl > div,
.flow-with-proof article,
.pipeline-line article,
.loop-line article,
.scorecard article {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.executive-proof article {
  display: grid;
  gap: 8px;
  min-height: 136px;
  padding: 16px;
}

b,
dt {
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 950;
  text-transform: uppercase;
}

.executive-proof strong,
.proof-metrics b,
.metric-column b {
  display: block;
  color: var(--ink);
  font-size: 3.05rem;
  line-height: 0.9;
  font-weight: 950;
}

.executive-proof span,
.answer-main strong,
dd,
.plain-list,
.process-line span,
.pipeline-line span,
.lesson-row span,
.before-after span,
.loop-line span,
.scorecard span,
.closing-position span {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 720;
}

.case-visual {
  margin: 0;
}

.case-visual img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
}

.case-visual figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.answer-sheet {
  display: grid;
  grid-template-columns: minmax(300px, 0.48fr) minmax(0, 1fr);
  gap: 28px;
  align-items: stretch;
}

.answer-main {
  display: grid;
  align-content: start;
  gap: 18px;
  padding: 24px;
  background: var(--ink);
  color: var(--paper);
}

.answer-main b,
.answer-main strong {
  color: var(--paper);
}

.answer-main strong {
  font-size: 1.9rem;
  line-height: 1.1;
}

.answer-sheet dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.answer-sheet dl > div {
  min-height: 92px;
  padding: 14px 16px;
}

dt {
  margin-bottom: 8px;
}

dd {
  margin: 0;
  line-height: 1.32;
}

.two-column-exhibit,
.context-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 30px;
}

.context-board {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.two-column-exhibit > div,
.context-board > div {
  padding: 26px;
  border-top: 4px solid var(--ink);
  background: var(--soft);
}

.plain-list {
  display: grid;
  gap: 15px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(22, 22, 22, 0.25);
}

.flow-with-proof {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.36fr);
  gap: 28px;
  align-items: stretch;
}

.process-line,
.pipeline-line,
.loop-line,
.scorecard {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.process-line {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.process-line li,
.pipeline-line article,
.loop-line article,
.scorecard article {
  display: grid;
  align-content: start;
  gap: 18px;
  min-height: 210px;
  padding: 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.proof-metrics,
.metric-column,
.closing-position {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.proof-metrics span,
.metric-column span {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 850;
}

.challenge-exhibit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: 24px;
  align-items: stretch;
}

.challenge-exhibit figure {
  margin: 0;
}

.challenge-exhibit img {
  display: block;
  width: 100%;
  max-height: 50vh;
  object-fit: contain;
  border: 1px solid var(--line);
}

.challenge-exhibit figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.pipeline-line {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.lesson-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--ink);
}

.lesson-row b,
.lesson-row span {
  color: var(--paper);
}

.before-after {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
}

.before-after article {
  display: grid;
  gap: 18px;
  min-height: 300px;
  padding: 28px;
  border-top: 4px solid var(--line);
  background: var(--soft);
}

.before-after strong {
  display: block;
  color: var(--ink);
  font-size: 2.2rem;
  line-height: 1.05;
  font-weight: 950;
}

.loop-line {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.scorecard {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 900;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: var(--paper);
}

.button.secondary {
  background: var(--paper);
}

.closing-position {
  padding: 0;
}

.closing-position b,
.closing-position span {
  display: block;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.closing-position span {
  font-size: 1.24rem;
  line-height: 1.3;
}

.deck-controls {
  position: fixed;
  right: 22px;
  bottom: 18px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 1.4rem;
  font-weight: 950;
  cursor: pointer;
}

.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.34;
}

.slide-status {
  display: grid;
  min-width: 128px;
  text-align: center;
}

.slide-status span:first-child {
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 950;
}

.slide-status span:last-child {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
}

@media (max-width: 1180px) {
  nav {
    display: none;
  }

  .slide {
    overflow: auto;
    padding: 34px 30px 90px;
  }

  .title-slide,
  .closing-slide,
  .answer-sheet,
  .two-column-exhibit,
  .context-board,
  .flow-with-proof,
  .before-after,
  .challenge-exhibit {
    grid-template-columns: 1fr;
  }

  .process-line,
  .pipeline-line,
  .loop-line,
  .scorecard,
  .executive-proof,
  .answer-sheet dl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .so-what {
    position: static;
    margin-top: 24px;
  }
}

@media (max-width: 720px) {
  .topbar {
    height: 52px;
    padding: 0 16px;
  }

  .slide {
    inset: 52px 0 0;
    height: calc(100vh - 52px);
    padding: 26px 18px 160px;
  }

  h1 {
    font-size: 2.55rem;
  }

  h2 {
    font-size: 2rem;
  }

  .lead {
    font-size: 1rem;
  }

  .process-line,
  .pipeline-line,
  .loop-line,
  .scorecard,
  .executive-proof,
  .answer-sheet dl {
    grid-template-columns: 1fr;
  }

  .deck-controls {
    right: 12px;
    left: 12px;
    justify-content: space-between;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slide {
    transition: none;
  }
}