@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,600;0,700;1,400&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg: #0f1419;
  --bg-slide: #fafaf7;
  --bg-panel: #ffffff;
  --bg-accent: #f4f1eb;
  --border: #e2dfd8;
  --border-strong: #c9c4b8;
  --ink: #1a1a2e;
  --ink-muted: #55556b;
  --ink-dim: #8a8a9e;
  --navy: #1d3557;
  --navy-deep: #0f1e33;
  --navy-light: #2c5282;
  --gold: #b8860b;
  --gold-light: #d4a017;
  --red: #9b2c2c;
  --red-light: #e53e3e;
  --green: #2a7f62;
  --highlight: #fef3c7;
  --highlight-strong: #fcd34d;
  --serif: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --mono: 'JetBrains Mono', 'Menlo', monospace;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.25);
}

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

html {
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* =============================================================
   SLIDE LAYOUT — each slide is a full-viewport section
   ============================================================= */
section.slide {
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px 80px;
  position: relative;
  background: var(--bg-slide);
  border-bottom: 2px solid var(--border);
}

section.slide:last-of-type { border-bottom: none; }

/* Slide number badge */
.slide-number {
  position: absolute;
  top: 24px;
  right: 32px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
  letter-spacing: 0.1em;
}

/* =============================================================
   TITLE SLIDE
   ============================================================= */
section.slide.title-slide {
  background: var(--navy);
  color: var(--bg-slide);
  text-align: center;
}

section.slide.title-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 25% 30%, rgba(212, 160, 23, 0.12) 0%, transparent 55%),
    radial-gradient(circle at 75% 70%, rgba(255, 255, 255, 0.06) 0%, transparent 55%);
  pointer-events: none;
}

section.slide.title-slide .eyebrow {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

section.slide.title-slide h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  line-height: 1.05;
  max-width: 1200px;
  position: relative;
  z-index: 1;
  margin-bottom: 40px;
}

section.slide.title-slide .attribution {
  font-family: var(--mono);
  font-size: 0.9375rem;
  color: rgba(250, 250, 247, 0.55);
  position: relative;
  z-index: 1;
  margin-top: 40px;
}

/* =============================================================
   STANDARD SLIDE CONTENT
   ============================================================= */
.slide-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  line-height: 1.1;
  color: var(--navy);
  text-align: center;
  margin-bottom: 40px;
  max-width: 1200px;
}

.slide-title.huge {
  font-size: clamp(3rem, 8vw, 6rem);
}

.slide-body {
  max-width: 1000px;
  text-align: center;
}

.big-text {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 1em;
  font-weight: 400;
}

.big-text strong {
  color: var(--navy);
  font-weight: 700;
}

.big-text em {
  color: var(--red);
  font-style: italic;
}

.small-context {
  font-family: var(--sans);
  font-size: 1.125rem;
  color: var(--ink-muted);
  margin-top: 32px;
}

/* =============================================================
   IMAGE-CENTRIC SLIDES
   ============================================================= */
.slide-hero-image {
  max-width: 60vh;
  max-height: 70vh;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  display: block;
  margin: 0 auto 32px;
}

.slide-hero-image.wide {
  max-width: 85vw;
  max-height: 65vh;
}

.image-caption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--ink-muted);
  margin-top: 20px;
  text-align: center;
}

.image-caption strong {
  color: var(--navy);
  font-style: normal;
  font-weight: 700;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: center;
}

.image-grid img {
  width: 100%;
  max-height: 55vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}

.image-grid figcaption {
  font-family: var(--sans);
  font-size: 0.9375rem;
  color: var(--ink-muted);
  text-align: center;
  margin-top: 12px;
}

.side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  max-width: 1400px;
}

.side-by-side img {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

/* =============================================================
   STAT / PULLQUOTE SLIDES
   ============================================================= */
.giant-stat {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(8rem, 22vw, 18rem);
  line-height: 1;
  color: var(--red);
  text-align: center;
  margin-bottom: 20px;
}

.giant-stat-label {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  line-height: 1.4;
  color: var(--ink);
  max-width: 900px;
  text-align: center;
  margin: 0 auto;
}

.giant-stat-label em {
  color: var(--ink-muted);
  font-size: 0.85em;
  display: block;
  margin-top: 16px;
}

.pullquote-slide {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.3;
  color: var(--navy);
  text-align: center;
  max-width: 1200px;
  border-left: 6px solid var(--gold);
  padding-left: 50px;
}

/* =============================================================
   INTERACTIVE DEMO CONTAINERS
   ============================================================= */
.demo-wrap {
  width: 100%;
  max-width: 1300px;
}

.demo-label {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  text-align: center;
  margin-bottom: 12px;
}

.demo-heading {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--navy);
  text-align: center;
  margin-bottom: 32px;
}

button.demo-btn {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  background: var(--navy);
  color: var(--bg-slide);
  border: none;
  padding: 12px 22px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  margin: 4px;
}

button.demo-btn:hover {
  background: var(--navy-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

button.demo-btn:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
  transform: none;
}

button.demo-btn.secondary {
  background: var(--bg-panel);
  color: var(--navy);
  border: 2px solid var(--navy);
}

button.demo-btn.secondary:hover {
  background: var(--navy);
  color: var(--bg-slide);
}

button.demo-btn.danger {
  background: var(--red);
}

button.demo-btn.danger:hover {
  background: var(--red-light);
}

button.demo-btn.active {
  background: var(--gold);
  color: var(--ink);
}

.filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 16px 0 24px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 16px 0;
  flex-wrap: wrap;
  justify-content: center;
}

.control-label {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink-muted);
}

input[type="range"] {
  width: 400px;
  max-width: 60vw;
  height: 10px;
  -webkit-appearance: none;
  background: var(--border);
  border-radius: 5px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  background: var(--navy);
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid var(--bg-slide);
  box-shadow: var(--shadow-sm);
}

input[type="range"]::-moz-range-thumb {
  width: 28px;
  height: 28px;
  background: var(--navy);
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid var(--bg-slide);
}

.range-value {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.375rem;
  color: var(--navy);
  min-width: 120px;
  text-align: left;
}

/* =============================================================
   DATA TABLES
   ============================================================= */
.tables-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 20px 0;
  width: 100%;
}

.data-table-wrapper {
  background: var(--bg-slide);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table-caption {
  background: var(--bg-accent);
  padding: 10px 14px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}

.table-scroll {
  max-height: 340px;
  overflow-y: auto;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.data-table th {
  background: var(--bg-accent);
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--ink-muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

.data-table td {
  padding: 7px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--ink);
}

.data-table tr {
  transition: all 0.4s ease;
}

.data-table tr.filtered-out {
  opacity: 0.12;
  filter: grayscale(1);
}

.data-table tr.match {
  background: var(--highlight);
}

.data-table tr.reveal {
  background: var(--highlight-strong);
  font-weight: 700;
}

.data-table .generalized {
  color: var(--ink-dim);
  font-style: italic;
}

.data-table .suppressed {
  color: var(--red);
  text-decoration: line-through;
  opacity: 0.5;
}

.data-table tr.homogeneity-group td {
  background: var(--highlight);
}

.data-table tr.homogeneity-reveal td:last-child {
  background: var(--highlight-strong);
  font-weight: 700;
  color: var(--red);
}

/* =============================================================
   CHART STYLES
   ============================================================= */
.chart-container {
  position: relative;
  background: var(--bg-slide);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin: 12px 0;
  width: 100%;
}

.chart-container svg {
  width: 100%;
  height: auto;
  display: block;
}

.chart-bar { transition: all 0.3s ease; }
.chart-bar.true { fill: var(--border-strong); }
.chart-bar.noisy { fill: var(--navy); }
.chart-bar.erased { fill: var(--red-light); opacity: 0.3; }
.chart-label { font-family: var(--mono); font-size: 11px; fill: var(--ink-muted); }
.chart-axis { stroke: var(--border-strong); stroke-width: 1; }
.chart-title { font-family: var(--sans); font-size: 14px; font-weight: 600; fill: var(--ink); }

.glass-overlay {
  position: absolute;
  inset: 24px;
  pointer-events: none;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition: all 0.3s ease;
  border-radius: 8px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 16px 0 0;
}

.stat-box {
  background: var(--bg-accent);
  padding: 12px 16px;
  border-radius: 8px;
  border-left: 3px solid var(--navy);
}

.stat-box-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 4px;
}

.stat-box-value {
  font-family: var(--mono);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--navy);
}

.stat-box.delta { border-left-color: var(--gold); }
.stat-box.delta .stat-box-value { color: var(--gold); }
.stat-box.erased-count { border-left-color: var(--red); }
.stat-box.erased-count .stat-box-value { color: var(--red); }

/* Slide 13: compact header row — slider + interpretation on left, stats on right */
.epsilon-header {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) auto;
  gap: 24px;
  align-items: center;
  margin-bottom: 12px;
}

.epsilon-controls {
  min-width: 0;
}

.stats-row.stats-row-compact {
  display: flex;
  gap: 10px;
  margin: 0;
}

.stats-row.stats-row-compact .stat-box {
  padding: 8px 14px;
  min-width: 120px;
}

.stats-row.stats-row-compact .stat-box-label {
  font-size: 0.6875rem;
  margin-bottom: 2px;
}

.stats-row.stats-row-compact .stat-box-value {
  font-size: 1.0625rem;
}

@media (max-width: 1100px) {
  .epsilon-header { grid-template-columns: 1fr; }
  .stats-row.stats-row-compact { flex-wrap: wrap; }
}

/* =============================================================
   SLIDE 17 — WHAT'S AT STAKE (minority erasure consequences)
   ============================================================= */
.stakes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto 28px;
}

.stakes-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--red);
  border-radius: 10px;
  padding: 26px 28px;
  box-shadow: var(--shadow-md);
  text-align: left;
}

.stakes-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 10px;
}

.stakes-card p {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.45vw, 1.1875rem);
  line-height: 1.55;
  color: var(--ink);
  margin: 0;
}

.stakes-source {
  display: block;
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px 24px;
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  text-align: left;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.stakes-source:hover,
.stakes-source:focus-visible {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.stakes-source-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 6px;
}

.stakes-source-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  color: var(--navy);
  margin-bottom: 4px;
  line-height: 1.35;
}

.stakes-source-meta {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

@media (max-width: 900px) {
  .stakes-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   SLIDE 18 — MATTHEW EFFECT (DP in AI/ML)
   ============================================================= */
.matthew-epigraph {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  line-height: 1.5;
  color: var(--ink-muted);
  text-align: center;
  max-width: 900px;
  margin: 0 auto 28px;
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.matthew-epigraph .matthew-cite {
  display: block;
  font-style: normal;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gold);
  margin-top: 8px;
}

.matthew-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.matthew-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy);
  border-radius: 8px;
  padding: 20px 22px;
  text-align: left;
}

.matthew-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 8px;
}

.matthew-card p {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.35vw, 1.125rem);
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}

@media (max-width: 900px) {
  .matthew-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   SLIDE 19 — COMPLIANCE & PRIVACY THEATER
   ============================================================= */
.compliance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto 28px;
}

.compliance-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 26px;
  box-shadow: var(--shadow-sm);
  text-align: left;
  position: relative;
}

.compliance-flag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--bg-slide);
  background: var(--navy);
  padding: 3px 9px;
  border-radius: 3px;
  margin-bottom: 10px;
}

.compliance-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.25rem, 1.8vw, 1.5rem);
  color: var(--navy);
  margin-bottom: 10px;
}

.compliance-year {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-left: 8px;
  vertical-align: middle;
}

.compliance-card p {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.35vw, 1.125rem);
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}

.theater-callout {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 22px 28px;
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-left: 4px solid var(--red);
  border-radius: 8px;
  text-align: left;
}

.theater-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 12px;
}

.theater-quote {
  font-family: var(--serif);
  font-size: clamp(1.125rem, 1.8vw, 1.5rem);
  line-height: 1.5;
  margin: 0 0 14px;
}

.theater-claim {
  font-style: italic;
  color: var(--ink);
}

.theater-reply {
  color: var(--red);
  font-weight: 600;
}

.theater-body {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.35vw, 1.125rem);
  line-height: 1.55;
  color: var(--ink);
  margin: 0;
}

@media (max-width: 900px) {
  .compliance-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   SLIDE 20 — REFRAME / FURTHER READING
   ============================================================= */
.reframe-body {
  margin-bottom: 40px;
}

.reframe-tagline {
  margin-top: 36px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.375rem;
}

.further-reading {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.further-reading-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  text-align: center;
  margin-bottom: 14px;
}

.further-reading-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.further-reading-item {
  display: block;
  padding: 14px 18px;
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  text-align: left;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.further-reading-item:hover,
.further-reading-item:focus-visible {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: var(--shadow-md);
  outline: none;
}

.fr-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
  line-height: 1.35;
  margin-bottom: 4px;
}

.fr-meta {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

@media (max-width: 900px) {
  .further-reading-list { grid-template-columns: 1fr; }
}

/* =============================================================
   SLIDE 21 — INTRO TO FEDERATED LEARNING (big link card)
   ============================================================= */
.fl-bigcard {
  display: block;
  max-width: 900px;
  width: 90%;
  margin: 0 auto;
  padding: 48px 56px;
  background: var(--bg-panel);
  border: 2px solid var(--border);
  border-left: 6px solid var(--gold);
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  text-align: left;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.fl-bigcard:hover,
.fl-bigcard:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: var(--shadow-lg);
  outline: none;
}

.fl-bigcard-label {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.fl-bigcard-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  line-height: 1.15;
  color: var(--navy);
  margin-bottom: 14px;
}

.fl-bigcard-meta {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink-muted);
}

#epsilonInterpretation {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.375rem;
  color: var(--ink-muted);
  text-align: center;
  margin: 12px 0;
  min-height: 1.8em;
}

/* =============================================================
   DEPLOYMENT CARDS (DP in the wild)
   ============================================================= */
.deployment-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 1200px;
  margin: 30px auto;
}

.deployment-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-md);
  text-align: left;
}

a.deployment-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}

a.deployment-card-link:hover,
a.deployment-card-link:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gold);
  outline: none;
}

a.deployment-card-link .deployment-title::after {
  content: " ↗";
  font-size: 0.75em;
  color: var(--ink-muted);
  transition: color 0.15s ease;
}

a.deployment-card-link:hover .deployment-title::after {
  color: var(--gold);
}

.deployment-icon {
  font-size: 3rem;
  margin-bottom: 14px;
}

.deployment-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--navy);
  margin-bottom: 12px;
}

.deployment-desc {
  font-size: 1.0625rem;
  color: var(--ink-muted);
  line-height: 1.5;
}

/* =============================================================
   TRUST GAP VISUAL
   ============================================================= */
.trust-gap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 1100px;
  margin: 20px auto;
}

.trust-gap-box {
  text-align: center;
  padding: 50px 30px;
  background: var(--bg-accent);
  border-radius: 14px;
}

.trust-gap-number {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(5rem, 12vw, 10rem);
  line-height: 1;
  color: var(--navy);
}

.trust-gap-box.gap {
  border: 4px solid var(--red);
}

.trust-gap-box.gap .trust-gap-number {
  color: var(--red);
}

.trust-gap-label {
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--ink);
  margin-top: 16px;
  line-height: 1.4;
}

/* =============================================================
   PRESENTATION CHROME: nav, progress, speaker notes
   ============================================================= */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: var(--gold);
  z-index: 1000;
  transition: width 0.3s ease;
  width: 0%;
}

.slide-dots {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 999;
  background: rgba(15, 20, 25, 0.6);
  padding: 10px 16px;
  border-radius: 30px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.slide-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: all 0.2s;
}

.slide-dot.active {
  background: var(--gold-light);
  transform: scale(1.4);
}

.slide-counter {
  position: fixed;
  bottom: 20px;
  right: 24px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(15, 20, 25, 0.6);
  padding: 8px 14px;
  border-radius: 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
}

.nav-hint {
  position: fixed;
  bottom: 20px;
  left: 24px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
  background: rgba(15, 20, 25, 0.6);
  padding: 8px 14px;
  border-radius: 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
}

/* Speaker notes panel */
.speaker-notes-panel {
  position: fixed;
  top: 0;
  right: -480px;
  width: 460px;
  height: 100vh;
  background: var(--bg-panel);
  border-left: 3px solid var(--gold);
  padding: 40px 32px;
  overflow-y: auto;
  transition: right 0.3s ease;
  z-index: 1100;
  box-shadow: var(--shadow-lg);
}

.speaker-notes-panel.visible { right: 0; }

.speaker-notes-panel h3 {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}

.speaker-notes-panel h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--navy);
  margin-bottom: 20px;
  line-height: 1.3;
}

.speaker-notes-panel p {
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 1em;
}

.speaker-notes-panel .close-notes {
  position: absolute;
  top: 16px;
  right: 20px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--ink-muted);
  cursor: pointer;
}

/* Hidden speaker notes in slides (data source for the panel) */
.speaker-notes {
  display: none;
}

/* =============================================================
   DEPLOYMENT IMAGES (era setting)
   ============================================================= */
.collage-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
  max-width: 1400px;
  align-items: center;
}

.collage-3 img {
  width: 100%;
  max-height: 55vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}

.collage-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1500px;
  align-items: end;
}

.collage-4 figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
}

.collage-4 img {
  width: 100%;
  max-height: 48vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}

.collage-caption {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-muted);
  text-align: center;
  margin-top: 10px;
  line-height: 1.35;
}

/* =============================================================
   SLIDE 4 — DIRECT IDENTIFIERS LAYOUT
   ============================================================= */
.gic-header {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto 20px;
}

.gic-logo-small {
  max-height: 72px;
  flex-shrink: 0;
}

.gic-intro {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.4vw, 1.125rem);
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
  text-align: left;
}

.direct-id-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 24px;
  align-items: start;
  max-width: 1500px;
  width: 100%;
  margin: 0 auto;
}

.hospital-wrapper {
  min-width: 0;
}

.hospital-table {
  font-size: 0.6875rem;
}

.hospital-table th,
.hospital-table td {
  padding: 5px 8px;
  white-space: nowrap;
}

.weld-aside {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  gap: 8px;
}

.weld-aside img {
  width: 100%;
  max-width: 180px;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
  transition: filter 0.6s ease;
}

.weld-aside img.blurred {
  filter: blur(14px) grayscale(0.4);
}

.weld-aside figcaption {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-align: center;
  line-height: 1.35;
}

.direct-id-cell,
.hospital-table th.direct-id-col {
  transition: color 0.4s ease, background 0.4s ease;
}

.hospital-table.redacted .direct-id-cell,
.hospital-table.redacted th.direct-id-col {
  background: #111;
  color: transparent;
  text-shadow: none;
  user-select: none;
}

.direct-id-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 18px;
}

.direct-id-caption {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.5;
  color: var(--ink);
  max-width: 1100px;
  margin: 18px auto 0;
  text-align: center;
}

/* =============================================================
   SLIDE 5 — SWEENEY LAYOUT
   ============================================================= */
.sweeney-layout {
  display: grid;
  grid-template-columns: minmax(320px, 400px) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  max-width: 1500px;
  width: 100%;
  margin: 0 auto;
}

.sweeney-aside {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  gap: 14px;
  position: sticky;
  top: 60px;
}

.sweeney-aside img {
  width: 100%;
  max-width: 400px;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

.sweeney-aside figcaption {
  font-family: var(--sans);
  font-size: 0.9375rem;
  color: var(--ink-muted);
  text-align: center;
  line-height: 1.4;
}

.sweeney-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.sweeney-text {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.55vw, 1.3125rem);
  line-height: 1.55;
  color: var(--ink);
  text-align: left;
}

.sweeney-text p {
  margin: 0 0 14px;
}

.sweeney-text p:last-child {
  margin-bottom: 0;
}

.sweeney-text .price {
  color: var(--red);
  font-weight: 700;
  font-style: italic;
}

.voter-wrapper {
  width: 100%;
  margin: 0;
}

.voter-reg-table {
  font-size: 0.75rem;
}

.voter-reg-table th,
.voter-reg-table td {
  padding: 6px 10px;
  white-space: nowrap;
}

/* =============================================================
   SLIDE 8 — QUASI-IDENTIFIERS BLOCK
   ============================================================= */
.giant-stat.stat-medium {
  font-size: clamp(5rem, 12vw, 10rem);
  margin-bottom: 10px;
}

.giant-stat.stat-small {
  font-size: clamp(4rem, 9vw, 7rem);
  margin-bottom: 6px;
  text-align: left;
}

.quasi-layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 48px;
  max-width: 1500px;
  width: 100%;
  align-items: start;
}

.quasi-left {
  text-align: left;
}

.quasi-left .giant-stat-label {
  text-align: left;
  max-width: none;
  margin: 0 0 20px;
}

.quasi-right-heading {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.25rem, 1.8vw, 1.5rem);
  color: var(--navy);
  margin: 0 0 16px;
}

.quasi-cat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 20px;
}

.quasi-cat {
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy);
  border-radius: 6px;
  padding: 12px 16px;
  text-align: left;
}

.quasi-cat-wide {
  grid-column: 1 / -1;
}

.quasi-cat-title {
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 10px;
}

.quasi-cat ul {
  margin: 0;
  padding-left: 20px;
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--ink);
}

.quasi-cat li {
  margin-bottom: 4px;
}

@media (max-width: 1100px) {
  .quasi-layout { grid-template-columns: 1fr; gap: 32px; }
  .giant-stat.stat-small { text-align: center; }
  .quasi-left .giant-stat-label { text-align: center; }
}

@media (max-width: 700px) {
  .quasi-cat-grid { grid-template-columns: 1fr; }
  .quasi-cat-wide { grid-column: auto; }
}

.quasi-block {
  max-width: 900px;
  margin: 18px 0 0;
  text-align: left;
}

.quasi-text {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 18px;
}

.quasi-text:last-child {
  margin-bottom: 0;
}

.quasi-text.quasi-callout {
  text-align: center;
  font-size: clamp(1.0625rem, 1.65vw, 1.375rem);
  color: var(--navy);
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: 24px;
}

/* =============================================================
   SLIDE 9 — k-ANONYMITY / SPARTACUS
   ============================================================= */
.spartacus-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.spartacus-figure img {
  width: 100%;
  max-height: 60vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

.spartacus-figure figcaption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--ink-muted);
  text-align: center;
}

.k-anon-text {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.55vw, 1.3125rem);
  line-height: 1.55;
  color: var(--ink);
  text-align: left;
}

.k-anon-text p {
  margin: 0 0 16px;
}

.k-anon-text p:last-child {
  margin-bottom: 0;
}

.k-anon-text .kminus {
  color: var(--navy);
  font-weight: 700;
  font-style: normal;
}

/* =============================================================
   SLIDE 10 — INTERACTIVE k-ANONYMIZATION
   ============================================================= */
.demo-subcaption {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.3vw, 1.125rem);
  line-height: 1.5;
  color: var(--ink-muted);
  text-align: center;
  max-width: 820px;
  margin: 0 auto 18px;
}

.k-mechanism-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 900px;
  margin: 24px auto 0;
}

.k-mechanism-card {
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
}

.k-mech-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 8px;
}

.k-mechanism-card p {
  font-family: var(--serif);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}

.k-mechanism-card code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--bg-slide);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

@media (max-width: 900px) {
  .k-mechanism-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   SLIDE 12 — DIFFERENTIAL PRIVACY / FROSTED GLASS TWO-COLUMN
   ============================================================= */
.dp-intro-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  max-width: 1500px;
  width: 100%;
  align-items: start;
}

.dp-intro-left,
.dp-intro-right {
  min-width: 0;
  text-align: left;
}

.dp-year {
  font-family: var(--sans);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  margin: 0 0 8px;
}

.dp-authors {
  font-family: var(--serif);
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  color: var(--ink-muted);
  margin: 0 0 24px;
}

.dp-thesis {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.375rem, 2.2vw, 1.75rem);
  line-height: 1.4;
  color: var(--navy);
  margin: 0 0 24px;
  border-left: 3px solid var(--gold);
  padding-left: 16px;
}

.dp-thesis em {
  color: var(--ink-muted);
  font-weight: 400;
}

.dp-thesis strong {
  font-style: normal;
  color: var(--navy);
}

.dp-body {
  font-family: var(--serif);
  font-size: clamp(0.9375rem, 1.4vw, 1.125rem);
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 14px;
}

.dp-body:last-child {
  margin-bottom: 0;
}

.dp-right-heading {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  color: var(--navy);
  margin: 0 0 8px;
}

.dp-right-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1rem, 1.55vw, 1.25rem);
  color: var(--ink-muted);
  margin: 0 0 18px;
}

.crowd-container {
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #000;
  margin-bottom: 14px;
}

.crowd-image {
  display: block;
  width: 100%;
  max-height: 40vh;
  object-fit: cover;
  transition: filter 0.2s ease-out;
}

.crowd-control-row {
  margin: 8px 0 12px;
}

.crowd-caption {
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

.dp-playable-link {
  display: block;
  margin-top: 18px;
  padding: 14px 18px;
  background: var(--bg-accent);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.dp-playable-link:hover,
.dp-playable-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: var(--shadow-md);
  outline: none;
}

.dp-playable-label {
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 4px;
}

.dp-playable-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--navy);
  margin-bottom: 2px;
}

.dp-playable-meta {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

@media (max-width: 1100px) {
  .dp-intro-layout { grid-template-columns: 1fr; gap: 36px; }
}

/* =============================================================
   RESPONSIVE
   ============================================================= */
@media (max-width: 1100px) {
  .tables-grid { grid-template-columns: 1fr; }
  .deployment-grid { grid-template-columns: 1fr; }
  .trust-gap { grid-template-columns: 1fr; }
  .side-by-side { grid-template-columns: 1fr; }
  .collage-3, .image-grid { grid-template-columns: 1fr 1fr; }
  .collage-4 { grid-template-columns: 1fr 1fr; }
  .direct-id-layout { grid-template-columns: 1fr; }
  .sweeney-layout { grid-template-columns: 1fr; gap: 20px; }
  .sweeney-aside { max-width: 180px; margin: 0 auto; }
  .sweeney-text { text-align: center; }
  .weld-aside { flex-direction: row; max-width: 420px; margin: 0 auto; }
  .weld-aside img { max-width: 140px; }
  .gic-header { flex-direction: column; text-align: center; }
  .gic-intro { text-align: center; }
}

@media (max-width: 700px) {
  section.slide { padding: 40px 20px; }
  .collage-3, .image-grid, .collage-4 { grid-template-columns: 1fr; }
}