:root {
  --presentation-body: clamp(24px, 1.8vw, 30px);
  --presentation-title: clamp(40px, 5vw, 68px);
  --presentation-control-bg: var(--color-ink-950);
  --presentation-control-fg: var(--color-on-dark);
  --presentation-progress: var(--color-signal);
  --presentation-control-safe: 112px;
}

.presentation-launcher {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.duration-option {
  min-height: var(--control-min);
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 800;
}

.duration-option[aria-pressed="true"] {
  background: var(--color-ink-900);
  color: var(--color-on-dark);
}

.case-hero .duration-option {
  color: var(--color-foreground);
}

.case-hero .duration-option[aria-pressed="true"] {
  color: var(--color-on-dark);
}

.case-hero .button-secondary {
  border-color: var(--color-on-dark-muted);
  color: var(--color-on-dark);
}

.case-hero .button-secondary:hover {
  background: var(--color-paper-100);
  color: var(--color-foreground);
}

.presentation-hub {
  background: var(--color-paper-50);
}

.deck-launcher {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr);
  gap: var(--space-12);
  align-items: end;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--spacing-page);
}

.deck-launcher-title {
  max-width: 760px;
  margin-block: var(--space-4);
  color: var(--color-heading);
  font-size: clamp(var(--font-3xl), 5vw, var(--font-5xl));
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.045em;
}

.deck-launcher .presentation-launcher {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.deck-launcher .duration-option {
  display: grid;
  gap: var(--space-2);
  align-content: start;
  border-radius: var(--radius-lg);
  text-align: left;
}

.deck-launcher .duration-option span {
  color: var(--color-muted);
  font-size: var(--font-sm);
  font-weight: 500;
  line-height: 1.55;
}

.deck-launcher .duration-option[aria-pressed="true"] span {
  color: var(--color-on-dark-muted);
}

.deck-story {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--spacing-page);
}

.deck-chapter {
  min-height: min(820px, 90svh);
  align-content: center;
  padding-block: clamp(var(--space-16), 9vw, var(--space-24));
}

.deck-opening,
.deck-closing {
  display: grid;
  gap: var(--space-6);
}

.deck-opening h1,
.deck-closing h2 {
  max-width: 1180px;
  font-size: clamp(52px, 7vw, 112px);
  line-height: .94;
  letter-spacing: -.055em;
}

.deck-opening-lead,
.deck-listener-note {
  max-width: 900px;
  font-size: clamp(20px, 2vw, 30px);
}

.deck-listener-note {
  padding-left: var(--space-5);
  border-left: 4px solid var(--color-signal);
}

.deck-capability-grid,
.deck-method-grid,
.deck-timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.deck-capability,
.deck-method-step,
.deck-timeline article {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.deck-capability > span,
.deck-method-step > span {
  color: var(--color-signal-hover);
  font-family: var(--font-mono);
  font-weight: 800;
}

.deck-method-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.deck-method-step {
  display: grid;
  gap: var(--space-6);
}

.deck-ranking-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-8);
}

.deck-ranking-card {
  display: grid;
  gap: var(--space-5);
  padding: clamp(var(--space-5), 3vw, var(--space-8));
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
}

.deck-ranking-card > div {
  display: flex;
  gap: var(--space-4);
  align-items: end;
}

.deck-ranking-number {
  color: var(--color-signal-hover);
  font-family: var(--font-mono);
  font-size: clamp(42px, 5vw, 72px);
  font-weight: 900;
  line-height: .85;
}

.deck-ranking-card h3 {
  max-width: 540px;
  font-size: clamp(24px, 2.4vw, 36px);
}

.deck-ranking-card ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.deck-ranking-card li {
  display: grid;
  gap: var(--space-1);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: var(--font-sm);
}

.deck-ranking-card li strong {
  color: var(--color-heading);
  font-family: var(--font-mono);
  font-size: var(--font-xl);
}

.deck-ranking-note {
  max-width: 1080px;
  margin-top: var(--space-5);
  padding-left: var(--space-4);
  border-left: 4px solid var(--color-signal);
  color: var(--color-muted);
}

.deck-project {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  gap: clamp(var(--space-6), 4vw, var(--space-12));
  align-items: center;
}

.deck-project-copy h2 {
  margin-top: var(--space-3);
  overflow-wrap: anywhere;
}

.deck-project-problem {
  max-width: 820px;
  font-size: clamp(20px, 2vw, 30px);
}

.deck-repo-meta {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}

.deck-repo-score {
  flex: 0 0 auto;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--repo-accent);
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
  font-weight: 800;
}

.deck-journey {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.deck-journey-step {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.deck-journey-step > span {
  color: var(--repo-accent);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  font-weight: 900;
}

.deck-journey-step h3 {
  margin: var(--space-1) 0;
  color: var(--color-heading);
  font-size: clamp(15px, 1.25vw, 18px);
}

.deck-journey-step p:last-child {
  margin: 0;
  color: var(--color-muted);
  font-size: clamp(13px, 1.05vw, 16px);
  line-height: 1.45;
}

.deck-project-visual,
.deck-evidence {
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  background: var(--color-ink-900);
  box-shadow: var(--shadow-lift);
}

.deck-project-visual img,
.deck-evidence img {
  width: 100%;
  height: auto;
}

.deck-repo-identity {
  position: relative;
  display: grid;
  min-height: 0;
  gap: var(--space-5);
  align-content: space-between;
  overflow: hidden;
  padding: clamp(var(--space-5), 3vw, var(--space-8));
  border: 1px solid var(--repo-accent);
  background:
    radial-gradient(circle at 78% 18%, var(--repo-accent-soft), transparent 36%),
    linear-gradient(145deg, rgb(255 255 255 / 7%), transparent 62%),
    var(--color-ink-900);
  color: var(--color-on-dark);
  box-shadow: var(--shadow-lift);
}

.deck-repo-identity::before,
.deck-repo-identity::after {
  position: absolute;
  border: 1px solid var(--repo-accent);
  border-radius: 50%;
  content: '';
  opacity: 0.46;
}

.deck-repo-identity::before {
  top: -110px;
  right: -60px;
  width: 340px;
  height: 340px;
}

.deck-repo-identity::after {
  top: 78px;
  right: 78px;
  width: 130px;
  height: 130px;
}

.deck-repo-identity > * {
  position: relative;
  z-index: 1;
}

.deck-repo-mark {
  display: grid;
  gap: var(--space-3);
}

.deck-repo-mark span,
.deck-repo-mark em {
  overflow-wrap: anywhere;
  color: var(--color-on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  font-style: normal;
}

.deck-repo-mark strong {
  color: var(--repo-accent);
  font-family: var(--font-mono);
  font-size: clamp(5rem, 9vw, 8rem);
  letter-spacing: -0.11em;
  line-height: 0.72;
}

.deck-repo-mark em {
  color: var(--color-on-dark);
  font-size: clamp(var(--font-lg), 2vw, var(--font-2xl));
  font-weight: 800;
}

.deck-effort {
  display: grid;
  gap: var(--space-2);
  padding-block: var(--space-4);
  border-block: 1px solid rgb(255 255 255 / 18%);
}

.deck-effort strong {
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 38px);
  line-height: 1;
}

.deck-effort > span {
  color: var(--color-on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
}

.deck-ability-scores {
  display: grid;
  gap: var(--space-2);
  margin: 0;
}

.deck-ability-scores div {
  display: flex;
  gap: var(--space-3);
  justify-content: space-between;
}

.deck-ability-scores dt {
  color: var(--color-on-dark-muted);
}

.deck-ability-scores dd {
  margin: 0;
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-weight: 800;
}

.deck-repo-footer {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.deck-research-keyword {
  width: fit-content;
  padding: var(--space-1) var(--space-3);
  border-left: 3px solid var(--repo-accent);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
}

.deck-case-link {
  display: inline-block;
  font-weight: 800;
}

.deck-repo-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.deck-evidence {
  max-width: 760px;
  margin-top: var(--space-10);
}

.deck-evidence figcaption {
  padding: var(--space-4);
  color: var(--color-on-dark-muted);
}

.deck-keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-10);
}

.deck-keyword-cloud span {
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
}

.deck-closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.presentation-controls {
  position: fixed;
  z-index: 1000;
  right: var(--space-5);
  bottom: var(--space-5);
  left: var(--space-5);
  display: none;
  grid-template-columns: auto auto auto 1fr auto auto auto;
  gap: var(--space-3);
  align-items: center;
  max-width: 920px;
  min-height: 68px;
  margin-inline: auto;
  padding: var(--space-3);
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-pill);
  background: rgb(4 16 24 / 94%);
  color: var(--presentation-control-fg);
  box-shadow: var(--shadow-lift);
  backdrop-filter: blur(18px);
}

.presentation-control {
  display: inline-grid;
  min-width: var(--control-min);
  min-height: var(--control-min);
  place-items: center;
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-pill);
  background: var(--color-dark-surface-alt);
  color: var(--color-on-dark);
  cursor: pointer;
  font-weight: 800;
}

.presentation-control:hover {
  border-color: var(--color-signal);
  color: var(--color-signal);
}

.presentation-progress-wrap {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}

.presentation-progress-track {
  height: 4px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-gray-700);
}

.presentation-progress-bar {
  width: 0;
  height: 100%;
  background: var(--presentation-progress);
  transition: width var(--duration-normal) var(--ease-out);
}

.presentation-progress-label {
  overflow: hidden;
  color: var(--color-on-dark-muted);
  font-size: var(--font-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

body[data-presenting="true"] {
  background: var(--color-dark-surface);
  font-size: var(--presentation-body);
}

body[data-presenting="true"]::before,
body[data-presenting="true"] .site-header,
body[data-presenting="true"] .site-footer,
body[data-presenting="true"] .case-toc,
body[data-presenting="true"] [data-reading-only] {
  display: none;
}

body[data-presenting="true"] .presentation-controls {
  display: grid;
}

body[data-presenting="true"] #main-content,
body[data-presenting="true"] [data-presentation-root],
body[data-presenting="true"] .case-layout,
body[data-presenting="true"] .case-story,
body[data-presenting="true"] .deck-story {
  width: 100%;
  max-width: none;
  margin: 0;
}

body[data-presenting="true"] .case-layout,
body[data-presenting="true"] .case-story,
body[data-presenting="true"] .deck-story {
  display: contents;
}

body[data-presenting="true"] [data-chapter] {
  display: none;
}

body[data-presenting="true"] [data-chapter][data-active="true"] {
  display: grid;
  width: 100%;
  height: 100svh;
  height: 100dvh;
  min-height: 100svh;
  min-height: 100dvh;
  max-height: 100svh;
  max-height: 100dvh;
  align-content: center;
  overflow-x: clip;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  padding: clamp(var(--space-8), 4vw, var(--space-16)) clamp(var(--space-8), 6vw, var(--space-20)) var(--presentation-control-safe);
  border: 0;
  background: var(--color-dark-surface);
  color: var(--color-on-dark);
}

body[data-presenting="true"] #summary .visually-hidden {
  position: static !important;
  width: auto !important;
  height: auto !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

body[data-presenting="true"] #summary .summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: var(--space-10) 0 0;
}

body[data-presenting="true"] [data-chapter][data-active="true"]:nth-child(even) {
  background: var(--color-paper-100);
  color: var(--color-foreground);
}

body[data-presenting="true"] [data-chapter] h2 {
  max-width: 1100px;
  color: inherit;
  font-size: var(--presentation-title);
}

body[data-presenting="true"] [data-chapter] h1 {
  max-width: 1200px;
  color: inherit;
  font-size: var(--presentation-title);
}

body[data-presenting="true"] .case-section-header {
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

body[data-presenting="true"] .deck-capability-grid,
body[data-presenting="true"] .deck-method-grid,
body[data-presenting="true"] .deck-timeline {
  gap: var(--space-4);
  margin-top: var(--space-6);
}

body[data-presenting="true"] .deck-capability,
body[data-presenting="true"] .deck-method-step,
body[data-presenting="true"] .deck-timeline article,
body[data-presenting="true"] .role-panel {
  padding: var(--space-5);
}

body[data-presenting="true"] .deck-capability h3,
body[data-presenting="true"] .deck-method-step h3,
body[data-presenting="true"] .deck-timeline h3,
body[data-presenting="true"] .role-panel h3 {
  font-size: clamp(20px, 2vw, 28px);
}

body[data-presenting="true"] .deck-capability p,
body[data-presenting="true"] .deck-method-step p,
body[data-presenting="true"] .deck-timeline p,
body[data-presenting="true"] .role-panel p,
body[data-presenting="true"] .role-panel li {
  font-size: clamp(14px, 1.35vw, 18px);
  line-height: 1.45;
}

body[data-presenting="true"] .deck-method-step {
  gap: var(--space-3);
}

body[data-presenting="true"] .deck-ranking-grid {
  gap: var(--space-4);
  margin-top: var(--space-5);
}

body[data-presenting="true"] .deck-ranking-card {
  gap: var(--space-3);
  padding: var(--space-5);
}

body[data-presenting="true"] .deck-ranking-card h3 {
  font-size: clamp(20px, 2vw, 28px);
}

body[data-presenting="true"] .deck-ranking-note {
  margin-top: var(--space-4);
  font-size: clamp(13px, 1.2vw, 17px);
}

body[data-presenting="true"] .deck-project {
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  gap: clamp(var(--space-5), 3vw, var(--space-10));
}

body[data-presenting="true"] .deck-project-problem {
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.45;
}

body[data-presenting="true"] .deck-project-visual img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

body[data-presenting="true"] .deck-repo-identity {
  min-height: min(60vh, 560px);
}

body[data-presenting="true"] .deck-repo-footer {
  gap: var(--space-2);
  margin-top: var(--space-3);
}

body[data-presenting="true"] .deck-case-link {
  font-size: var(--font-sm);
}

body[data-presenting="true"] .deck-detail {
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr);
  grid-template-areas: "detail-header detail-header" "detail-flow detail-evidence";
  gap: var(--space-5) var(--space-8);
}

body[data-presenting="true"] .deck-detail .case-section-header {
  grid-area: detail-header;
  margin-bottom: 0;
}

body[data-presenting="true"] .deck-detail h2 {
  font-size: clamp(30px, 3.4vw, 48px);
}

body[data-presenting="true"] .deck-detail .system-flow {
  grid-area: detail-flow;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
}

body[data-presenting="true"] .deck-detail .system-node {
  min-height: 0;
  padding: var(--space-3);
  color: var(--color-foreground);
  font-size: clamp(13px, 1.2vw, 17px);
}

body[data-presenting="true"] .deck-detail .system-node::after {
  display: none;
}

body[data-presenting="true"] .deck-detail .system-node-number {
  margin-bottom: var(--space-2);
}

body[data-presenting="true"] .deck-detail .deck-evidence {
  grid-area: detail-evidence;
  align-self: start;
  margin: 0;
}

body[data-presenting="true"] .deck-detail .deck-evidence figcaption {
  padding: var(--space-3);
  font-size: var(--font-xs);
}

body[data-presenting="true"] .deck-role .role-grid {
  gap: var(--space-4);
  margin-top: var(--space-6);
}

body[data-presenting="true"] .deck-role .role-panel ul {
  margin-bottom: 0;
}

body[data-presenting="true"] .deck-research[data-active="true"] {
  align-content: start;
  overflow-y: auto;
  scrollbar-gutter: stable;
}

body[data-presenting="true"] .deck-research .deck-keyword-cloud {
  gap: var(--space-2);
  margin-top: var(--space-6);
}

body[data-presenting="true"] .deck-research .deck-keyword-cloud span {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-sm);
}

body[data-presenting="true"] [data-chapter] .case-copy {
  max-width: 1100px;
  margin: var(--space-10) 0 0;
}

body[data-presenting="true"] [data-chapter] .case-copy p {
  color: inherit;
  font-size: var(--presentation-body);
  line-height: 1.55;
}

body[data-presenting="true"] .system-flow,
body[data-presenting="true"] .media-grid,
body[data-presenting="true"] .role-grid {
  margin-top: var(--space-12);
}

@media (max-width: 760px) {
  .deck-launcher,
  .deck-project {
    grid-template-columns: 1fr;
  }

  .deck-launcher .presentation-launcher,
  .deck-capability-grid,
  .deck-method-grid,
  .deck-ranking-grid,
  .deck-timeline,
  .deck-project .summary-grid {
    grid-template-columns: 1fr;
  }

  .deck-opening h1,
  .deck-closing h2 {
    font-size: clamp(44px, 14vw, 70px);
  }

  .deck-repo-identity {
    min-height: 240px;
  }

  .presentation-controls {
    right: var(--space-2);
    bottom: var(--space-2);
    left: var(--space-2);
    grid-template-columns: auto auto minmax(0, 1fr) auto;
    border-radius: var(--radius-lg);
  }

  .presentation-control[data-presentation-home],
  .presentation-control[data-presentation-end],
  .presentation-control[data-presentation-fullscreen] {
    display: none;
  }

  body[data-presenting="true"] [data-chapter][data-active="true"] {
    height: 100svh;
    height: 100dvh;
    min-height: 100svh;
    min-height: 100dvh;
    padding: var(--space-4) var(--space-5) 96px;
  }

  body[data-presenting="true"] [data-chapter] h1,
  body[data-presenting="true"] [data-chapter] h2 {
    font-size: clamp(34px, 10vw, 46px);
    line-height: 1.02;
  }

  body[data-presenting="true"] .deck-project {
    align-content: start;
    align-items: start;
    gap: var(--space-3);
    grid-auto-rows: max-content;
  }

  body[data-presenting="true"] .deck-repo-meta {
    align-items: start;
  }

  body[data-presenting="true"] .deck-repo-score {
    padding-inline: var(--space-2);
  }

  body[data-presenting="true"] .deck-project-problem {
    margin-block: var(--space-2);
    font-size: 17px;
  }

  body[data-presenting="true"] .deck-project .summary-grid {
    gap: var(--space-2);
    margin-top: var(--space-2);
  }

  body[data-presenting="true"] .deck-project .summary-card {
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-project .summary-card p {
    margin: var(--space-1) 0 0;
    font-size: 15px;
  }

  body[data-presenting="true"] .deck-journey {
    gap: var(--space-2);
    margin-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-journey-step {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: var(--space-2);
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-journey-step h3 {
    font-size: 15px;
  }

  body[data-presenting="true"] .deck-journey-step p:last-child {
    font-size: 14px;
  }

  body[data-presenting="true"] .deck-capability-grid,
  body[data-presenting="true"] .deck-timeline {
    gap: var(--space-2);
    margin-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body[data-presenting="true"] .deck-capability,
  body[data-presenting="true"] .deck-timeline article {
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-capability h3 {
    font-size: 16px;
  }

  body[data-presenting="true"] .deck-capability p {
    font-size: 12px;
    line-height: 1.35;
  }

  body[data-presenting="true"] .deck-method-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
    margin-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-method-step {
    gap: var(--space-1);
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-method-step > span {
    display: none;
  }

  body[data-presenting="true"] .deck-method-step h3 {
    font-size: 18px;
  }

  body[data-presenting="true"] .deck-method-step p {
    font-size: 13px;
    line-height: 1.35;
  }

  body[data-presenting="true"] .deck-case-link {
    font-size: var(--font-xs);
  }

  body[data-presenting="true"] .deck-repo-footer {
    display: block;
    margin-top: var(--space-2);
  }

  body[data-presenting="true"] .deck-repo-footer .tag-list,
  body[data-presenting="true"] .deck-research-keyword {
    display: none;
  }

  body[data-presenting="true"] .deck-detail {
    grid-template-columns: 1fr;
    grid-template-areas: "detail-header" "detail-flow";
    gap: var(--space-3);
  }

  body[data-presenting="true"] .deck-detail .system-flow {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  body[data-presenting="true"] .deck-detail .system-node {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: var(--space-2);
    align-items: center;
    padding: var(--space-2);
    font-size: 13px;
  }

  body[data-presenting="true"] .deck-detail .system-node-number {
    margin: 0;
  }

  body[data-presenting="true"] #summary .summary-grid {
    grid-template-columns: 1fr;
  }

  body[data-presenting="true"] .deck-project {
    grid-template-columns: 1fr;
  }

  body[data-presenting="true"] .deck-project-visual,
  body[data-presenting="true"] .deck-evidence {
    display: none;
  }

  body[data-presenting="true"] .deck-repo-identity {
    display: grid;
    min-height: 0;
    gap: var(--space-2);
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-repo-mark {
    display: none;
  }

  body[data-presenting="true"] .deck-effort {
    padding-block: var(--space-1);
  }

  body[data-presenting="true"] .deck-effort strong {
    font-size: 22px;
  }

  body[data-presenting="true"] .deck-ability-scores {
    display: none;
  }

  body[data-presenting="true"] .deck-ability-scores div {
    display: grid;
    gap: 0;
  }

  body[data-presenting="true"] .deck-ability-scores dt,
  body[data-presenting="true"] .deck-ability-scores dd {
    font-size: 12px;
  }

  body[data-presenting="true"] .deck-ranking-card {
    gap: var(--space-2);
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-ranking-card h3 {
    font-size: 18px;
  }

  body[data-presenting="true"] .deck-ranking-card ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  body[data-presenting="true"] .deck-ranking-card li {
    padding-top: var(--space-1);
    font-size: 11px;
  }

  body[data-presenting="true"] .deck-ranking-card li strong {
    font-size: 16px;
  }
}

@media (max-height: 800px) {
  :root {
    --presentation-control-safe: 94px;
    --presentation-title: clamp(34px, 4.2vw, 54px);
  }

  body[data-presenting="true"] [data-chapter][data-active="true"] {
    align-content: start;
    padding: var(--space-6) clamp(var(--space-6), 4vw, var(--space-12)) var(--presentation-control-safe);
  }

  body[data-presenting="true"] .case-section-header {
    margin-bottom: var(--space-3);
  }

  body[data-presenting="true"] .deck-capability-grid,
  body[data-presenting="true"] .deck-method-grid,
  body[data-presenting="true"] .deck-timeline {
    gap: var(--space-2);
    margin-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-capability,
  body[data-presenting="true"] .deck-method-step,
  body[data-presenting="true"] .deck-timeline article,
  body[data-presenting="true"] .role-panel {
    padding: var(--space-3);
  }

  body[data-presenting="true"] .deck-ranking-grid {
    gap: var(--space-3);
    margin-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-ranking-card {
    gap: var(--space-2);
    padding: var(--space-4);
  }

  body[data-presenting="true"] .deck-ranking-number {
    font-size: clamp(36px, 4vw, 54px);
  }

  body[data-presenting="true"] .deck-ranking-card h3 {
    font-size: clamp(18px, 1.7vw, 24px);
  }

  body[data-presenting="true"] .deck-ranking-card li {
    padding-top: var(--space-2);
    font-size: 12px;
  }

  body[data-presenting="true"] .deck-ranking-card li strong {
    font-size: 18px;
  }

  body[data-presenting="true"] .deck-project {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, .5fr);
    gap: var(--space-5);
  }

  body[data-presenting="true"] .deck-project-copy h2 {
    margin-top: var(--space-1);
  }

  body[data-presenting="true"] .deck-project-problem {
    margin-block: var(--space-2);
    font-size: clamp(16px, 1.5vw, 20px);
  }

  body[data-presenting="true"] .deck-journey {
    gap: var(--space-1);
    margin-top: var(--space-2);
  }

  body[data-presenting="true"] .deck-journey-step {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
  }

  body[data-presenting="true"] .deck-journey-step h3 {
    margin: 0;
    font-size: 14px;
  }

  body[data-presenting="true"] .deck-journey-step p:last-child {
    font-size: 13px;
    line-height: 1.35;
  }

  body[data-presenting="true"] .deck-repo-footer {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-2);
    align-items: center;
    margin-top: var(--space-2);
  }

  body[data-presenting="true"] .deck-repo-footer .tag-list {
    gap: var(--space-1);
  }

  body[data-presenting="true"] .deck-research-keyword {
    display: none;
  }

  body[data-presenting="true"] .deck-repo-identity {
    min-height: 0;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  body[data-presenting="true"] .deck-repo-mark strong {
    font-size: clamp(4rem, 7vw, 6rem);
  }

  body[data-presenting="true"] .deck-effort {
    padding-block: var(--space-3);
  }

  body[data-presenting="true"] .deck-effort strong {
    font-size: clamp(22px, 2.3vw, 30px);
  }

  .presentation-controls {
    bottom: var(--space-2);
    min-height: 60px;
    padding: var(--space-2);
  }
}

@media (max-height: 680px) {
  :root {
    --presentation-control-safe: 82px;
    --presentation-title: clamp(30px, 3.6vw, 46px);
  }

  body[data-presenting="true"] [data-chapter][data-active="true"] {
    padding-top: var(--space-3);
  }

  body[data-presenting="true"] .deck-project {
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, .4fr);
    gap: var(--space-3);
  }

  body[data-presenting="true"] .deck-project-problem {
    font-size: 15px;
  }

  body[data-presenting="true"] .deck-journey-step .project-kicker,
  body[data-presenting="true"] .deck-journey-step h3 {
    display: none;
  }

  body[data-presenting="true"] .deck-repo-mark {
    display: none;
  }

  body[data-presenting="true"] .deck-repo-footer .tag-list {
    display: none;
  }

  body[data-presenting="true"] .deck-ranking-note {
    margin-top: var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .presentation-progress-bar {
    transition-duration: .01ms;
  }
}