:root {
  --base-w: 1920px;
  --base-h: 1080px;
  --print-w: 13.333333in;
  --print-h: 7.5in;
  --preview-scale: 1;
  --u: 1px;
  --bg: #f8f7f5;
  --paper: #ffffff;
  --paper-soft: #fbfbfc;
  --text: #101114;
  --muted: #5a5f69;
  --accent: #73000a;
  --accent-2: #9d1c2c;
  --line: #d7dbe0;
  --soft-line: #eceef1;
  --success: #1c7c54;
  --warn: #b86b00;
  --danger: #b42318;
  --blue-soft: #eaf2ff;
  --green-soft: #ebf8ef;
  --red-soft: #fcebea;
  --gray-soft: #f3f4f6;
  --ink-soft: #f0f1f3;
  --shadow-soft: 0 12px 30px rgba(16, 17, 20, 0.06);
  --heading-font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --body-font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono-font: "JetBrains Mono", "SFMono-Regular", "IBM Plex Mono", Menlo, Monaco, monospace;
}

@page {
  size: 13.333333in 7.5in;
  margin: 0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background:
    linear-gradient(180deg, rgba(115, 0, 10, 0.035), transparent 18%),
    linear-gradient(180deg, #f7f6f3, #ece9e2);
  color: var(--text);
  font-family: var(--body-font);
  line-height: 1.5;
  letter-spacing: 0.01em;
}

a {
  color: inherit;
}

.preview-shell {
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: calc(24 * var(--u));
}

.slide-stage {
  flex: 0 0 auto;
  height: calc(1080px * var(--preview-scale));
  position: relative;
  width: calc(1920px * var(--preview-scale));
}

.slide-canvas {
  background: var(--paper);
  box-shadow: 0 0 calc(28 * var(--u)) rgba(0, 0, 0, 0.14);
  color: var(--text);
  height: var(--base-h);
  overflow: hidden;
  position: relative;
  transform: scale(var(--preview-scale));
  transform-origin: top left;
  width: var(--base-w);
}

.lecture-slide {
  background: var(--paper);
}

.lecture-slide::before {
  background:
    linear-gradient(180deg, rgba(115, 0, 10, 0.035), transparent 20%),
    radial-gradient(circle at 86% 16%, rgba(115, 0, 10, 0.03), transparent 24%);
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
}

.slide-rail {
  display: none;
}

.slide-inner {
  height: 904px;
  left: 112px;
  position: absolute;
  top: 72px;
  width: 1696px;
  z-index: 1;
}

.slide-header {
  max-width: 1520px;
}

.slide-kicker {
  color: #7a2130;
  font-family: var(--heading-font);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1;
  text-transform: uppercase;
}

.slide-title {
  color: var(--text);
  font-family: var(--heading-font);
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.016em;
  line-height: 1.15;
  margin-top: 12px;
  text-wrap: balance;
}

.slide-rule {
  background: var(--accent);
  border-radius: 999px;
  height: 6px;
  margin-top: 16px;
  width: 138px;
}

.slide-body {
  height: 744px;
  margin-top: 28px;
}

.slide-footer {
  height: 44px;
  left: 116px;
  pointer-events: none;
  position: absolute;
  right: 78px;
  top: 996px;
  z-index: 6;
}

.page-number {
  color: var(--text);
  font-family: var(--heading-font);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  position: absolute;
  bottom: 14px;
  right: 0;
}

.footer-mark {
  align-items: center;
  border-top: 2px solid rgba(16, 17, 20, 0.12);
  color: var(--muted);
  display: flex;
  font-size: 14px;
  justify-content: space-between;
  min-height: 30px;
  padding-right: 48px;
  padding-top: 8px;
  width: 100%;
}

.footer-mark span:last-child {
  opacity: 0.9;
}

.deck-nav {
  align-items: center;
  display: flex;
  gap: 10px;
  position: absolute;
  right: 34px;
  top: 28px;
  z-index: 8;
}

.nav-btn {
  align-items: center;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(16, 17, 20, 0.1);
  border-radius: 999px;
  box-shadow: 0 10px 18px rgba(16, 17, 20, 0.08);
  color: var(--accent);
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 17px;
  font-weight: 800;
  gap: 8px;
  justify-content: center;
  min-height: 42px;
  min-width: 42px;
  padding: 0 14px;
  text-decoration: none;
}

.nav-btn.secondary {
  color: var(--text);
}

.lead {
  color: var(--text);
  font-size: 23px;
  font-weight: 500;
  letter-spacing: -0.012em;
  line-height: 1.35;
}

.body-copy {
  color: var(--text);
  font-size: 20px;
  line-height: 1.45;
}

.body-copy.small {
  font-size: 19px;
}

.keyword {
  color: var(--accent);
  font-weight: 700;
}

.micro-note {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.35;
}

.caption {
  color: var(--muted);
  font-size: 16px;
  font-style: italic;
  line-height: 1.3;
}

.bullet-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  list-style: none;
}

.bullet {
  align-items: flex-start;
  color: var(--text);
  display: flex;
  font-size: 20px;
  gap: 14px;
  line-height: 1.28;
}

.bullet::before {
  color: var(--accent);
  content: "•";
  font-family: var(--heading-font);
  font-size: 26px;
  font-weight: 800;
  line-height: 0.9;
}

.number-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  list-style: none;
}

.number-item {
  display: grid;
  gap: 14px;
  grid-template-columns: 48px 1fr;
  font-size: 20px;
  line-height: 1.28;
}

.number-item .num {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 26px;
  font-weight: 800;
  line-height: 0.9;
}

.split-40-60,
.split-50-50,
.split-60-40 {
  display: grid;
  gap: 34px;
  height: 100%;
}

.split-40-60 {
  grid-template-columns: 650px 1fr;
}

.split-50-50 {
  grid-template-columns: 1fr 1fr;
}

.split-60-40 {
  grid-template-columns: 1fr 650px;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 18px;
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
}

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

.stack-lg,
.stack-md,
.stack-sm {
  display: flex;
  flex-direction: column;
}

.stack-lg {
  gap: 24px;
}

.stack-md {
  gap: 16px;
}

.stack-sm {
  gap: 10px;
}

.align-top {
  align-items: flex-start;
}

.align-center {
  align-items: center;
}

.space-between {
  justify-content: space-between;
}

.centered-block {
  margin-left: auto;
  margin-right: auto;
}

.scene-card,
.code-block-shell,
.equation-block,
.table-shell,
.figure-frame,
.callout-minimal,
.stat-card,
.comparison-shell {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 22px;
}

.scene-card {
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  padding: 16px;
}

.media-stage {
  align-items: center;
  background: var(--paper);
  border: 1px solid var(--soft-line);
  border-radius: 18px;
  display: flex;
  height: 100%;
  justify-content: center;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.media-stage svg {
  display: block;
  height: 100%;
  width: 100%;
}

.figure-title {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.figure-caption {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.3;
}

.legend-row,
.chip-row,
.metric-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.status-chip,
.state-pill,
.mini-chip {
  align-items: center;
  border-radius: 999px;
  display: inline-flex;
  font-size: 16px;
  font-weight: 700;
  gap: 8px;
  line-height: 1;
  min-height: 34px;
  padding: 0 14px;
}

.status-chip {
  border: 1px solid rgba(16, 17, 20, 0.08);
}

.status-chip.accent,
.state-pill.accent,
.mini-chip.accent {
  background: rgba(115, 0, 10, 0.08);
  color: var(--accent);
}

.status-chip.success,
.state-pill.success,
.mini-chip.success {
  background: rgba(28, 124, 84, 0.1);
  color: var(--success);
}

.status-chip.warn,
.state-pill.warn,
.mini-chip.warn {
  background: rgba(184, 107, 0, 0.12);
  color: var(--warn);
}

.status-chip.soft,
.state-pill.soft,
.mini-chip.soft {
  background: var(--gray-soft);
  color: var(--muted);
}

.callout-minimal {
  border-left: 6px solid var(--accent);
  padding: 18px 22px;
}

.callout-minimal p {
  font-size: 22px;
  line-height: 1.32;
}

.equation-block {
  padding: 24px 26px;
}

.equation-main {
  color: var(--text);
  font-family: var(--mono-font);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.equation-sub {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.35;
  margin-top: 14px;
}

.fact-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.fact-card {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 18px;
}

.fact-card h3 {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fact-card p,
.fact-card li {
  color: var(--text);
  font-size: 18px;
  line-height: 1.3;
  margin-top: 8px;
}

.compare-table,
.matrix-table {
  border-collapse: collapse;
  width: 100%;
}

.compare-table th,
.compare-table td,
.matrix-table th,
.matrix-table td {
  border-bottom: 1px solid var(--line);
  font-size: 18px;
  line-height: 1.24;
  padding: 11px 13px;
  text-align: left;
  vertical-align: top;
}

.compare-table th,
.matrix-table th {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.compare-table td strong,
.matrix-table td strong {
  color: var(--accent);
}

.cell-highlight {
  background: rgba(115, 0, 10, 0.06);
  color: var(--accent);
  font-weight: 800;
}

.cell-success {
  background: rgba(28, 124, 84, 0.08);
  color: var(--success);
  font-weight: 700;
}

.cell-danger {
  background: rgba(180, 35, 24, 0.08);
  color: var(--danger);
  font-weight: 700;
}

.code-block-shell {
  font-family: var(--mono-font);
  font-size: 21px;
  line-height: 1.55;
  overflow: hidden;
  padding: 20px 24px;
}

.code-block-shell pre {
  white-space: pre-wrap;
}

.code-block-shell .code-line {
  border-left: 4px solid transparent;
  display: grid;
  gap: 12px;
  grid-template-columns: 32px 1fr;
  padding: 2px 0 2px 10px;
}

.code-block-shell .code-line.active {
  background: rgba(115, 0, 10, 0.06);
  border-left-color: var(--accent);
}

.code-block-shell .line-no {
  color: var(--muted);
}

.stat-card {
  padding: 18px 20px;
}

.stat-card .value {
  color: var(--accent);
  display: block;
  font-family: var(--heading-font);
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.stat-card .label {
  color: var(--text);
  display: block;
  font-size: 19px;
  line-height: 1.24;
  margin-top: 8px;
}

.route-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.route-step {
  align-items: center;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  display: grid;
  gap: 14px;
  grid-template-columns: 36px 1fr;
  padding: 11px 14px;
}

.route-step.active {
  border-color: rgba(115, 0, 10, 0.3);
  box-shadow: inset 0 0 0 1px rgba(115, 0, 10, 0.12);
}

.route-step .idx {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 28px;
  font-weight: 900;
  line-height: 0.95;
}

.route-step .copy {
  font-family: var(--mono-font);
  font-size: 19px;
}

.subtle-divider {
  border-top: 1px solid var(--line);
  margin: 10px 0 0;
}

.title-slide {
  background:
    linear-gradient(180deg, #fcfbf8, #f6f4ee);
}

.title-slide .slide-rail {
  display: none;
}

.title-slide .slide-inner {
  height: 800px;
  left: 120px;
  top: 90px;
  width: 1650px;
}

.title-main {
  display: flex;
  flex-direction: column;
  height: 100%;
  justify-content: space-between;
}

.title-title {
  color: var(--text);
  font-family: var(--heading-font);
  font-size: 96px;
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 0.9;
  max-width: 1180px;
}

.title-subtitle {
  color: var(--muted);
  font-size: 34px;
  line-height: 1.18;
  margin-top: 20px;
  max-width: 1100px;
}

.title-meta {
  color: var(--text);
  font-size: 28px;
  line-height: 1.34;
  margin-top: 30px;
}

.title-band {
  align-items: center;
  background: var(--accent);
  bottom: 0;
  color: #ffffff;
  display: flex;
  gap: 34px;
  justify-content: space-between;
  left: 0;
  padding: 24px 120px;
  position: absolute;
  right: 0;
}

.title-band h3 {
  font-family: var(--heading-font);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.title-band p {
  font-size: 20px;
  line-height: 1.3;
  opacity: 0.95;
}

.concept-flow {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.flow-chip {
  align-items: center;
  background: rgba(16, 17, 20, 0.04);
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-radius: 999px;
  color: var(--text);
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 24px;
  font-weight: 800;
  min-height: 48px;
  padding: 0 18px;
}

.flow-chip.accent {
  background: rgba(115, 0, 10, 0.1);
  color: var(--accent);
}

.flow-arrow {
  color: rgba(16, 17, 20, 0.38);
  font-family: var(--heading-font);
  font-size: 34px;
  font-weight: 800;
}

.scene-toolbar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
}

.step-hidden {
  display: none !important;
}

.fade-in,
.fade-up,
.draw-line,
.pulse-soft,
.glow-accent {
  will-change: auto;
}

.dimmed {
  opacity: 0.28;
}

.highlighted {
  color: var(--accent);
}

.deck-index {
  margin: 0 auto;
  max-width: 1200px;
  padding: 56px 28px 80px;
}

.deck-index h1 {
  color: var(--text);
  font-family: var(--heading-font);
  font-size: 70px;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.94;
}

.deck-index p {
  color: var(--muted);
  font-size: 24px;
  line-height: 1.4;
  margin-top: 18px;
  max-width: 960px;
}

.deck-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.deck-action {
  align-items: center;
  background: #ffffff;
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-left: 6px solid var(--accent);
  border-radius: 18px;
  color: var(--accent);
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 20px;
  font-weight: 800;
  min-height: 52px;
  padding: 0 18px;
  text-decoration: none;
}

.slide-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.slide-link {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-radius: 20px;
  color: inherit;
  display: block;
  padding: 18px 22px;
  text-decoration: none;
}

.slide-link strong {
  color: var(--text);
  display: block;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.slide-link span {
  color: var(--muted);
  display: block;
  font-size: 18px;
  line-height: 1.34;
  margin-top: 6px;
}

.print-deck-shell {
  background: #eeece7;
  min-height: 100vh;
  padding: 24px 0 40px;
}

.print-deck-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 18px;
}

.print-action {
  align-items: center;
  background: #ffffff;
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-left: 6px solid var(--accent);
  border-radius: 14px;
  color: var(--accent);
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 19px;
  font-weight: 800;
  min-height: 50px;
  padding: 0 18px;
  text-decoration: none;
}

.print-page {
  background: #ffffff;
  box-shadow: 0 0 26px rgba(16, 17, 20, 0.14);
  height: 720px;
  margin: 0 auto 22px;
  overflow: hidden;
  width: 1280px;
}

.print-image {
  display: block;
  height: 100%;
  object-fit: fill;
  width: 100%;
}

body.render-mode,
body.export-mode {
  background: #ffffff;
  overflow: hidden;
}

body.render-mode .preview-shell,
body.export-mode .preview-shell {
  min-height: 0;
  padding: 0;
}

body.render-mode .slide-stage,
body.export-mode .slide-stage {
  height: var(--base-h);
  width: var(--base-w);
}

.outline-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.outline-card,
.section-card,
.application-card,
.metric-card-minimal,
.explanation-card,
.state-card-panel,
.action-chip-card,
.legend-card,
.math-shell,
.comparison-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,249,251,0.98));
  border: 1px solid var(--line);
  border-radius: 22px;
}

.outline-card,
.section-card,
.application-card,
.explanation-card,
.state-card-panel,
.action-chip-card,
.legend-card,
.comparison-card {
  padding: 18px 20px;
}

.outline-card {
  border-left: 8px solid var(--accent);
  min-height: 142px;
}

.outline-card h3,
.section-card h3,
.application-card h3,
.state-card-panel h3,
.comparison-card h3 {
  color: var(--text);
  font-family: var(--heading-font);
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.outline-card p,
.section-card p,
.application-card p,
.comparison-card p,
.state-card-panel p,
.action-chip-card p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.32;
  margin-top: 8px;
}

.outline-card .eyebrow,
.section-card .eyebrow,
.application-card .eyebrow,
.comparison-card .eyebrow {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.section-card.soft-blue,
.application-card.soft-blue,
.comparison-card.soft-blue {
  border-left: 8px solid #204f8d;
}

.section-card.soft-green,
.application-card.soft-green,
.comparison-card.soft-green {
  border-left: 8px solid #1c7c54;
}

.section-card.soft-slate,
.application-card.soft-slate,
.comparison-card.soft-slate {
  border-left: 8px solid #66727d;
}

.application-strip {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.application-card {
  min-height: 142px;
}

.app-icon {
  align-items: center;
  background: rgba(115, 0, 10, 0.08);
  border-radius: 18px;
  color: var(--accent);
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 32px;
  font-weight: 900;
  height: 58px;
  justify-content: center;
  width: 58px;
}

.metric-grid-wide {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metric-card-minimal {
  padding: 18px 20px;
}

.metric-card-minimal .label {
  color: var(--muted);
  display: block;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.metric-card-minimal .value {
  color: var(--text);
  display: block;
  font-family: var(--heading-font);
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.95;
  margin-top: 10px;
}

.metric-card-minimal .sub {
  color: var(--muted);
  display: block;
  font-size: 17px;
  line-height: 1.28;
  margin-top: 6px;
}

.route-badge-row,
.fact-tag-row,
.concept-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.fact-tag,
.route-badge,
.concept-tag {
  align-items: center;
  background: rgba(16, 17, 20, 0.04);
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-radius: 999px;
  color: var(--text);
  display: inline-flex;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  min-height: 34px;
  padding: 0 14px;
}

.fact-tag.accent,
.route-badge.accent,
.concept-tag.accent {
  background: rgba(115, 0, 10, 0.08);
  color: var(--accent);
}

.fact-tag.success,
.route-badge.success,
.concept-tag.success {
  background: rgba(28, 124, 84, 0.11);
  color: var(--success);
}

.fact-tag.warn,
.route-badge.warn,
.concept-tag.warn {
  background: rgba(184, 107, 0, 0.12);
  color: var(--warn);
}

.callout-banner {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 8px solid var(--accent);
  border-radius: 22px;
  padding: 16px 18px;
}

.callout-banner p {
  color: var(--text);
  font-size: 20px;
  line-height: 1.28;
}

.math-shell {
  padding: 20px 22px;
}

math {
  color: var(--text);
  font-family: "STIX Two Math", "Cambria Math", "Times New Roman", serif;
}

math[display="block"] {
  display: block;
  font-size: 38px;
  line-height: 1.1;
  overflow: hidden;
}

.math-display {
  align-items: center;
  color: var(--text);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: "Times New Roman", Georgia, serif;
  font-size: 34px;
  line-height: 1.18;
}

.math-display.compact {
  font-size: 28px;
}

math {
  color: var(--text);
  font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif;
}

math[display="block"] {
  font-size: 38px;
  line-height: 1.2;
}

mtext {
  font-family: var(--body-font);
}

.math-op {
  font-style: normal;
  font-weight: 600;
}

.math-mi {
  font-style: italic;
}

.math-mono {
  font-family: var(--mono-font);
  font-size: 0.9em;
}

.math-subscript {
  display: inline-flex;
  flex-direction: column;
  line-height: 0.9;
  vertical-align: middle;
}

.math-subscript small {
  font-size: 0.55em;
  margin-left: 0.12em;
}

.math-constraint-list {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.math-constraint {
  color: var(--muted);
  display: flex;
  gap: 10px;
  font-size: 18px;
  line-height: 1.32;
}

.math-constraint .math-op {
  color: var(--accent);
  min-width: 94px;
}

.state-fact-board {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
}

.state-fact-board .board-title {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.state-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.state-fact {
  align-items: center;
  background: rgba(16, 17, 20, 0.04);
  border: 1px solid rgba(16, 17, 20, 0.08);
  border-radius: 999px;
  color: var(--text);
  display: inline-flex;
  font-family: var(--mono-font);
  font-size: 15px;
  gap: 8px;
  min-height: 36px;
  padding: 0 14px;
}

.state-fact.positive {
  background: rgba(28, 124, 84, 0.1);
  color: var(--success);
}

.state-fact.removed {
  background: rgba(180, 35, 24, 0.08);
  color: var(--danger);
  text-decoration: line-through;
}

.delta-arrow {
  align-items: center;
  color: var(--accent);
  display: flex;
  font-family: var(--heading-font);
  font-size: 44px;
  font-weight: 900;
  justify-content: center;
}

.search-note {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.3;
}

.problem-pair {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr 1fr;
}

.algorithm-chip {
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  display: inline-flex;
  font-family: var(--heading-font);
  font-size: 21px;
  font-weight: 900;
  min-height: 48px;
  padding: 0 16px;
}

.algorithm-chip.dfs {
  color: #204f8d;
}

.algorithm-chip.bfs {
  color: var(--accent);
}

.algorithm-chip.astar {
  color: var(--success);
}

.timeline-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 18px;
}

.timeline-row {
  align-items: baseline;
  border-top: 1px solid var(--soft-line);
  display: grid;
  gap: 16px;
  grid-template-columns: 90px 1fr;
  padding: 12px 0;
}

.timeline-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.timeline-row .tick {
  color: var(--accent);
  font-family: var(--heading-font);
  font-size: 26px;
  font-weight: 900;
  line-height: 0.95;
}

.timeline-row .desc {
  color: var(--text);
  font-size: 19px;
  line-height: 1.28;
}

body.render-mode .slide-canvas,
body.export-mode .slide-canvas {
  box-shadow: none;
  transform: none;
}

body.render-mode .deck-nav,
body.export-mode .deck-nav {
  display: none;
}

body.export-mode *,
body.render-mode * {
  transition: none !important;
  animation: none !important;
}

@media print {
  :root {
    --u: calc(13.333333in / 1920);
    --preview-scale: 1;
  }

  html,
  body {
    background: #ffffff;
    height: auto;
    margin: 0;
    overflow: hidden;
    padding: 0;
    width: auto;
  }

  body {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .preview-shell {
    min-height: 0;
    padding: 0;
  }

  .slide-stage {
    height: var(--base-h);
    width: var(--base-w);
  }

  .slide-canvas {
    box-shadow: none;
    transform: none;
  }

  .deck-nav,
  .print-deck-actions {
    display: none !important;
  }

  .print-deck-shell {
    background: #ffffff;
    padding: 0;
  }

  .print-page {
    box-shadow: none;
    break-after: page;
    height: var(--print-h);
    margin: 0;
    page-break-after: always;
    page-break-inside: avoid;
    width: var(--print-w);
  }

  .print-page:last-child {
    break-after: auto;
    page-break-after: auto;
  }

  .print-image {
    height: var(--print-h);
    width: var(--print-w);
  }
}