:root {
  color-scheme: light;
  --bg: #f5f6fb;
  --panel: #ffffff;
  --border: #d8dce8;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.16);
  --ms: #0ea5e9;
  --numeric: #eab308;
  --freeform: #94a3b8;
  font-family: "Inter", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

/* Dark hero section background */
.hero-bg {
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  padding-bottom: 2rem;
}

.wrap {
  max-width: 1280px;
  margin: 0 auto;
}

.masthead {
  background: transparent;
  color: #f8fafc;
  padding: 2.25rem 1.5rem 4rem;
}

.masthead h1 {
  margin: 0.4rem 0;
  font-size: clamp(2.4rem, 4vw, 3.1rem);
  letter-spacing: -0.02em;
}

.masthead .tagline {
  margin: 0;
  max-width: 640px;
  color: rgba(248, 250, 252, 0.78);
  line-height: 1.55;
}

.masthead .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  font-weight: 600;
  margin: 0;
  color: rgba(248, 250, 252, 0.6);
}

.page {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 0 2rem 4.5rem;
}

.intro {
  display: grid;
  gap: 2.5rem;
  padding: 2.5rem 2rem;
  background: rgba(15, 23, 42, 0.85);
  color: #f8fafc;
  border-radius: 24px;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.35);
}

.intro-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.intro-copy p {
  margin: 0;
  line-height: 1.7;
  color: rgba(248, 250, 252, 0.78);
}

/* Keep intro links the same color as surrounding text */
.intro-copy a { color: inherit; }
.intro-copy a:visited { color: inherit; }

.intro-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.4);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: rgba(248, 250, 252, 0.6);
}

.slides {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.section-block {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  padding: 1.25rem 0 1.5rem; /* full-bleed background area around content */
  /* theme variables with sensible defaults */
  --section-bg: transparent;
  --section-header-bg: #f8fafc;
  --section-header-border: var(--border);
  --section-header-h2: inherit;
  background: var(--section-bg);
}

.section-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 0 1rem; /* horizontal gutter; vertical handled by section-block */
}

/* (side rail removed; nav appears above content) */

/* Theme variable presets (applied on section-block via .theme--*) */
/* h2 colors are chosen to achieve ≥4.5:1 contrast on their respective light tinted backgrounds */
.theme--amber   { --section-bg: rgba(245, 158, 11, 0.12); --section-header-bg: rgba(245, 158, 11, 0.12); --section-header-border: rgba(245, 158, 11, 0.28); --section-header-h2: #78350f; }
.theme--rose    { --section-bg: rgba(244, 63, 94, 0.12);  --section-header-bg: rgba(244, 63, 94, 0.12);  --section-header-border: rgba(244, 63, 94, 0.28);  --section-header-h2: #9f1239; }
.theme--blue    { --section-bg: rgba(37, 99, 235, 0.12);  --section-header-bg: rgba(37, 99, 235, 0.10);  --section-header-border: rgba(37, 99, 235, 0.28);  --section-header-h2: #1e3a8a; }
.theme--indigo  { --section-bg: rgba(79, 70, 229, 0.12);  --section-header-bg: rgba(79, 70, 229, 0.12);  --section-header-border: rgba(79, 70, 229, 0.28);  --section-header-h2: #312e81; }
.theme--emerald { --section-bg: rgba(16, 185, 129, 0.12); --section-header-bg: rgba(16, 185, 129, 0.10); --section-header-border: rgba(16, 185, 129, 0.28); --section-header-h2: #064e3b; }
.theme--cyan    { --section-bg: rgba(6, 182, 212, 0.12);  --section-header-bg: rgba(6, 182, 212, 0.10);  --section-header-border: rgba(6, 182, 212, 0.28);  --section-header-h2: #164e63; }
.theme--sky     { --section-bg: rgba(14, 165, 233, 0.12); --section-header-bg: rgba(14, 165, 233, 0.10); --section-header-border: rgba(14, 165, 233, 0.28); --section-header-h2: #0c4a6e; }
.theme--fuchsia { --section-bg: rgba(217, 70, 239, 0.12); --section-header-bg: rgba(217, 70, 239, 0.10); --section-header-border: rgba(217, 70, 239, 0.28); --section-header-h2: #701a75; }


.section-header {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 0.85rem 0.5rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.78rem;
  border-radius: 12px;
  border: 1px solid var(--section-header-border);
  background: var(--section-header-bg);
}

.section-header h2 {
  margin: 0;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--section-header-h2);
}

.section-intro {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.section-intro-slide {
  margin-top: 0.5rem;
}

.section-intro-slide h2 {
  margin-top: 0;
}

.section-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.6rem 0.75rem;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  opacity: 1;
  transition: opacity 150ms ease-in-out;
}
.section-nav ul {
  display: flex;
  flex-wrap: wrap;
  overflow-x: auto;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.section-nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.85rem;
}
.section-nav a:hover {
  filter: brightness(0.95);
}

/* Reveal nav on hover/focus (desktop/tablet) */
.section-nav.is-stuck { opacity: 0.35; }
.section-nav.is-stuck:hover,
.section-nav.is-stuck:focus-within { opacity: 1; }

/* Keep nav fully opaque on small screens */
@media (max-width: 680px) {
  .section-nav { opacity: 1; }
}

/* Active section indicator without changing color */
.section-nav a[aria-current="true"] { text-decoration: underline; }

/* Offset jump targets so sticky nav doesn't obscure them */
.section-header { scroll-margin-top: 72px; }

/* (skip link removed; nav remains visible at top) */

.photo {
  margin-top: 1rem;
}

.class-photo {
  margin: 0;
}

.class-photo img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.class-photo figcaption {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.slide {
  background: var(--panel);
  border-radius: 24px;
  padding: clamp(1.1rem, 2vw, 1.6rem);
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.slide.grouped {
  padding: clamp(1.25rem, 2vw, 1.75rem) clamp(1.2rem, 2vw, 1.9rem);
}

.slide-header {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.slide-kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 600;
}

.slide-header h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.6vw, 1.95rem);
  line-height: 1.3;
}

.slide-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* Temporarily hide question-type badges */
.slide-tags { display: none !important; }

.slide-highlight {
  margin: 1.25rem 0 0;
  background: rgba(37, 99, 235, 0.08);
  border-radius: 14px;
  padding: 0.9rem 1.1rem;
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 600;
}

.response-count {
  margin: 0.6rem 0 0.4rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* When response-count is inside slide-header, let flex gap handle spacing */
.slide-header .response-count {
  margin: 0;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.chart-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.75rem 0.5rem 0;
}

.chart-card h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--text);
}

.chart-card .response-count {
  margin: 0 0 0.65rem;
}

.chart-card .chart--bar,
.chart-card .chart--pie {
  height: 240px;
}

.stacked-section,
.flow-section {
  margin-top: 1.5rem;
}

.stacked-section h3,
.flow-section h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  color: var(--text);
}

.slide.grouped.flow-only {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.flow-section--full h3 {
  font-size: 1.2rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: rgba(15, 23, 42, 0.05);
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.45rem;
  border-radius: 999px;
}

.pill-mc { background: rgba(37, 99, 235, 0.12); color: var(--accent); }
.pill-ms { background: rgba(14, 165, 233, 0.14); color: var(--ms); }
.pill-numeric { background: rgba(234, 179, 8, 0.18); color: var(--numeric); }
.pill-freeform { background: rgba(148, 163, 184, 0.16); color: var(--freeform); }
.pill-correlation { background: rgba(139, 92, 246, 0.18); color: #7c3aed; }

.chart {
  position: relative;
  width: 100%;
  margin-top: 1rem;
}

.chart canvas {
  width: 100% !important;
  height: 100% !important;
}

.chart--bar {
  height: 360px;
}

.chart--pie {
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  height: 360px;
}

.chart--sankey {
  height: 520px;
  margin-top: 0.75rem;
}

.numeric-summary {
  display: grid;
  gap: 0.4rem;
  margin: 1.8rem 0 0;
  font-size: 0.98rem;
}

.numeric-summary p {
  margin: 0;
  font-variant-numeric: tabular-nums;
}

/* Histogram styles */
.numeric-histogram {
  margin-top: 1rem;
}

.histogram-chart {
  width: 100%;
  overflow: visible;
}

.histogram-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.histogram-bar {
  fill: var(--primary, #3b82f6);
  opacity: 0.6;
}

.histogram-overlay {
  cursor: crosshair;
}

.hover-line {
  stroke: #475569;
  stroke-width: 1;
  stroke-dasharray: 3, 2;
  pointer-events: none;
}

.distribution-curve {
  fill: none;
  stroke: #5b21b6;
  stroke-width: 2;
  opacity: 0.8;
}

.distribution-label {
  font-size: 6px;
  fill: #5b21b6;
  font-weight: 500;
}

.stat-line {
  stroke-width: 1;
  stroke-dasharray: 4, 3;
  opacity: 0.5;
}

.mean-line {
  stroke: #7c3aed;
}

.median-line {
  stroke: #2563eb;
}

/* HTML-based stat bubbles (in foreignObject) */
.stat-bubble-html {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  gap: 2px;
}

.stat-bubble-label-html {
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: capitalize;
}

.stat-bubble-value-html {
  font-size: 11px;
  font-weight: 600;
}

.mean-bubble-html .stat-bubble-label-html,
.mean-bubble-html .stat-bubble-value-html {
  color: #7c3aed;
}

.median-bubble-html .stat-bubble-label-html,
.median-bubble-html .stat-bubble-value-html {
  color: #2563eb;
}

/* HTML-based hover tooltip */
.hover-tooltip-html {
  display: inline-flex;
  flex-direction: column;
  padding: 6px 10px;
  background: rgba(30, 41, 59, 0.95);
  border-radius: 4px;
  gap: 4px;
}

.hover-tooltip-value-html {
  font-size: 12px;
  font-weight: 600;
  color: white;
}

.hover-tooltip-percentile-html {
  font-size: 10px;
  color: rgba(255, 255, 255, 0.8);
}

.axis-label {
  font-size: 10px;
  fill: var(--muted, #64748b);
  text-anchor: middle;
}

.histogram-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.stat-row {
  display: flex;
  gap: 0.4rem;
}

.stat-label {
  color: var(--muted, #64748b);
}

.stat-value {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-mean .stat-label::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 2px;
  background: #7c3aed;
  margin-right: 0.3rem;
  vertical-align: middle;
}

.stat-median .stat-label::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 2px;
  background: #2563eb;
  margin-right: 0.3rem;
  vertical-align: middle;
}

.word-cloud {
  position: relative;
  height: 420px;
  margin-top: 1.5rem;
}

.word-cloud svg {
  width: 100%;
  height: 100%;
  display: block;
}

.longform-list {
  margin-top: 1.5rem;
  column-count: 2;
  column-gap: 1.4rem;
}

.longform-item {
  background: none;
  border-left: 2px solid rgba(37, 99, 235, 0.25);
  padding: 0.25rem 0 0.25rem 0.65rem;
  line-height: 1.35;
  color: var(--muted);
  margin: 0 0 0.45rem;
  break-inside: avoid-column;
  display: block;
  font-size: 0.92rem;
}

.longform-item strong {
  color: var(--text);
}

.longform-categorized {
  margin-top: 1.5rem;
}

.longform-category {
  margin-bottom: 1.5rem;
}

.longform-category-header {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.longform-category .longform-list {
  margin-top: 0;
}

.empty-state {
  padding: 1.75rem;
  border: 1px dashed var(--border);
  border-radius: 16px;
  background: rgba(37, 99, 235, 0.06);
  color: var(--muted);
}

.commentary {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

/* Side-by-side layout for commentary left/right */
.content-aside {
  display: flex;
  align-items: center; /* vertically center aside vs main */
  gap: 1rem;
}
.content-aside .main { flex: 1 1 auto; min-width: 0; }
.content-aside .commentary { flex: 0 0 280px; max-width: 340px; margin-top: 0; align-self: center; }
/* Compress visualizations slightly when using side-by-side layout */
.content-aside .word-cloud { height: 320px; }
/* Apply similar compaction to other chart types in aside layout */
.content-aside .chart--bar { height: 300px; }
.content-aside .chart--pie { height: 300px; }
.content-aside .chart--sankey { height: 380px; }
.content-aside .numeric-summary { margin-top: 0.6rem; }
.content-aside .longform-list { margin-top: 0.8rem; }
@media (max-width: 900px) {
  .content-aside { flex-direction: column; }
  .content-aside .commentary { flex: none; max-width: 100%; }
}



@media (max-width: 900px) {
  .intro {
    padding: 2rem 1.75rem;
  }

  .slide {
    padding: 1.75rem;
  }

  .chart--bar,
  .chart--pie {
    height: 320px;
  }

  .chart--sankey {
    height: 380px;
  }
}

/* Default box plot height */
.chart--box { height: 300px; }
.content-aside .chart--box { height: 260px; }

@media (max-width: 680px) {
  .page {
    padding: 0 1rem 3.5rem;
  }

  .intro {
    padding: 1.75rem 1.5rem;
    gap: 1.75rem;
  }

  .slides {
    gap: 1.25rem;
  }

  .section-header {
    padding: 0.5rem 0 0.35rem;
    font-size: 0.72rem;
  }

  .word-cloud {
    height: 380px;
  }

  .longform-list {
    column-count: 1;
  }

  .chart--bar,
  .chart--pie {
    height: 280px;
  }

  .chart-card .chart--bar,
  .chart-card .chart--pie {
    height: 220px;
  }

  .chart--sankey {
    height: 320px;
  }
}

/* Prevent full-bleed section backgrounds from causing horizontal scrollbars */
/* overflow-x: clip prevents horizontal scroll without creating a new scroll container,
   which would break position: sticky on the nav */
html, body { overflow-x: clip; }

/* Correlation Heatmap Styles */
.chart--heatmap {
  padding: 1rem 0;
}

.correlation-heatmap {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.heatmap-axis-label {
  font-size: 0.95rem;
  color: var(--muted);
}

.heatmap-axis-label strong {
  color: var(--text);
}

.heatmap-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.heatmap-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.5rem;
  color: var(--muted);
}

.heatmap-section--positive .heatmap-section-title {
  color: #2563eb;
}

.heatmap-section--negative .heatmap-section-title {
  color: #dc2626;
}

.heatmap-bars {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.heatmap-row {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 1rem;
  align-items: center;
  min-height: 2rem;
}

.heatmap-label {
  font-size: 0.85rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: right;
  padding-right: 0.5rem;
}

.heatmap-bars-wrapper {
  position: relative;
  padding-right: 3.5rem; /* Space for correlation coefficient values */
}

.heatmap-rows {
  display: flex;
  flex-direction: column;
}

.heatmap-row {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) 2.5fr;
  gap: 0.75rem;
  align-items: center;
}

.heatmap-labels-column {
  display: flex;
  flex-direction: column;
}

.heatmap-bars-column {
  position: relative;
  display: flex;
  flex-direction: column;
}

.heatmap-label {
  font-size: 0.85rem;
  color: var(--text);
  white-space: normal;
  word-wrap: break-word;
  text-align: right;
  min-height: 1.65rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.heatmap-bar-track {
  min-height: 1.65rem;
  position: relative;
  overflow: visible;
  display: flex;
  align-items: center;
}

.heatmap-ref-line-container {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 5;
  pointer-events: none;
  /* Left position is set via inline style from JavaScript */
}

.heatmap-ref-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: rgba(100, 116, 139, 0.4);
}

.heatmap-ref-label {
  position: absolute;
  top: -1.4rem;
  left: 0;
  transform: translateX(-50%);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  background: var(--panel);
  padding: 0 0.25rem;
}

.heatmap-ref-label-bottom {
  top: auto;
  bottom: -1.4rem;
}

.heatmap-bar {
  height: 1.25rem;
  margin-top: 0.2rem;
  border-radius: 4px;
  transition: width 0.3s ease;
  min-width: 4px;
}

.heatmap-value {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text);
  background: rgba(255, 255, 255, 0.95);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  margin-left: 0.5rem;
  white-space: nowrap;
  z-index: 10;
}

.heatmap-empty {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
  padding: 0.5rem 0;
}

/* Responsive adjustments for heatmap */
@media (max-width: 640px) {
  .heatmap-row {
    grid-template-columns: 1fr 1fr;
  }
  
  .heatmap-label {
    font-size: 0.75rem;
  }
  
  .heatmap-value {
    font-size: 0.7rem;
    min-width: 40px;
  }
}

/* Responsive adjustments for histogram */
@media (max-width: 640px) {
  .histogram-stats {
    font-size: 1.2rem;
    gap: 0.5rem 1.5rem;
  }
  
  .stat-row {
    gap: 0.4rem;
  }
  
  .stat-value {
    font-size: 1.4rem;
  }
  
  .axis-label {
    font-size: 18px;
  }
  
  /* HTML bubble mobile styles */
  .stat-bubble-html {
    padding: 6px 12px;
    gap: 6px;
    border-radius: 8px;
  }
  
  .stat-bubble-label-html {
    font-size: 17px;
  }
  
  .stat-bubble-value-html {
    font-size: 21px;
  }
  
  /* HTML tooltip mobile styles */
  .hover-tooltip-html {
    padding: 10px 14px;
    gap: 8px;
    border-radius: 10px;
  }
  
  .hover-tooltip-value-html {
    font-size: 23px;
  }
  
  .hover-tooltip-percentile-html {
    font-size: 19px;
  }
  
  .distribution-label {
    display: none;
  }
  
  .mean-line,
  .median-line {
    stroke-width: 3;
  }
}