:root {
  --m04-bg-base: #ffffff;
  --m04-bg-soft: #f8fafc;
  --m04-bg-muted: #eef3f8;
  --m04-text: #0f172a;
  --m04-text-secondary: #475569;
  --m04-muted: #64748b;
  --m04-border: #d7e0ea;
  --m04-primary: #2563eb;
  --m04-primary-soft: #dbeafe;
  --m04-population: #64748b;
  --m04-sample: #2563eb;
  --m04-sample-mean: #0f3f8c;
  --m04-theoretical: #d97706;
  --m04-empirical: #2563eb;
  --m04-warning: #dc2626;
  --m04-radius: 8px;
  --m04-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

body.quarto-dark,
body.dark {
  --m04-bg-base: #111827;
  --m04-bg-soft: #172033;
  --m04-bg-muted: #1e293b;
  --m04-text: #f8fafc;
  --m04-text-secondary: #cbd5e1;
  --m04-muted: #94a3b8;
  --m04-border: rgba(226, 232, 240, 0.18);
  --m04-shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
}

body:has(.m04-module-intro) {
  background: var(--m04-bg-base);
  color: var(--m04-text);
}

.m04-module-intro {
  max-width: 1180px;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 4rem;
}

.m01-module-kicker {
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--m04-primary);
  font-weight: 700;
  margin: 0 0 0.65rem;
}


.m01-kw {
  font-weight: 700;
  color: var(--m04-primary);
  border-bottom: 1px dotted var(--m04-primary);
}

.m04-lesson-header {
  border-bottom: 1px solid var(--m04-border);
  margin-bottom: 2.2rem;
  padding-bottom: 1.5rem;
}

.m04-lesson-kicker {
  color: var(--m04-primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 0.65rem;
  text-transform: uppercase;
}

.m04-lesson-header h1 {
  color: var(--m04-text);
  font-size: clamp(2.1rem, 3.4vw, 3.4rem);
  line-height: 1.05;
  margin: 0;
}

.m04-lesson-header p {
  color: var(--m04-text-secondary);
  font-size: 1rem;
  line-height: 1.65;
  margin: 0.8rem 0 0;
  max-width: 920px;
}

.m04-lesson-section {
  margin: 2.7rem 0;
}

.m04-lesson-section > h2 {
  color: var(--m04-text);
  font-size: 1.65rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.m04-social-question-title {
  color: var(--m04-text);
  font-size: clamp(1.45rem, 2.4vw, 2.2rem);
  line-height: 1.15;
  margin-inline: auto;
  max-width: 900px;
  text-align: center;
}

.m04-social-question-intro {
  color: var(--m04-text-secondary);
  font-size: 1rem;
  hyphens: auto;
  line-height: 1.7;
  margin: 1rem auto 0;
  max-width: 900px;
  text-align: justify;
  text-justify: inter-word;
}

.m04-sequence-flow {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.m04-flow-step {
  border-top: 2px solid var(--m04-border);
  padding-top: 0.95rem;
}

.m04-flow-step h3 {
  color: var(--m04-primary);
  font-size: 1rem;
  margin: 0 0 0.6rem;
}

.m04-flow-step p {
  color: var(--m04-text-secondary);
  font-size: 0.96rem;
  line-height: 1.65;
  margin: 0;
}

.m04-lab-surface.m04-lab-breakout,
#m04-lab-root {
  box-sizing: border-box !important;
  margin-left: 50% !important;
  max-width: 100vw !important;
  transform: translateX(-50%) !important;
  width: min(1380px, calc(100vw - 2.5rem)) !important;
}

.m04-lab-surface {
  background: var(--m04-bg-muted);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  box-shadow: var(--m04-shadow);
  padding: 1.35rem;
}

.m04-lab-layout {
  align-items: start;
  display: grid !important;
  gap: 1.75rem !important;
  grid-template-columns: minmax(280px, 320px) minmax(0, 1fr) !important;
  width: 100% !important;
}

.m04-lab-sidebar,
.m04-lab-main {
  min-width: 0;
}

.m04-lab-sidebar {
  display: grid;
  gap: 0.8rem;
  grid-column: 1 / 2 !important;
}

.m04-lab-main {
  display: grid;
  gap: 1rem;
  grid-column: 2 / 3 !important;
}

.m04-control-group,
.m04-panel,
.m04-tour-panel,
.m04-sample-panel {
  background: var(--m04-bg-base);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  padding: 0.8rem;
}

.m04-control-title {
  color: var(--m04-muted);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 0.5rem;
  text-transform: uppercase;
}

.m04-chip-row,
.m04-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.m04-chip,
.m04-btn {
  align-items: center;
  background: var(--m04-bg-base);
  border: 1px solid var(--m04-border);
  border-radius: 6px;
  color: var(--m04-text);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 0.76rem;
  justify-content: center;
  line-height: 1.1;
  min-height: 1.85rem;
  padding: 0.28rem 0.55rem;
}

.m04-chip:hover,
.m04-btn:hover,
.m04-chip:focus-visible,
.m04-btn:focus-visible {
  border-color: var(--m04-primary);
  outline: 2px solid transparent;
}

.m04-chip[aria-pressed="true"],
.m04-btn[aria-pressed="true"] {
  background: var(--m04-primary);
  border-color: var(--m04-primary);
  color: #ffffff;
}

.m04-btn-primary {
  background: var(--m04-primary);
  border-color: var(--m04-primary);
  color: #ffffff;
}

.m04-danger {
  border-color: rgba(220, 38, 38, 0.45);
  color: var(--m04-warning);
}

.m04-range-line {
  display: grid;
  gap: 0.4rem;
  grid-template-columns: 1fr minmax(96px, 128px);
}

.m04-range-line label,
.m04-check-line {
  color: var(--m04-text-secondary);
  font-size: 0.82rem;
}

.m04-range-line input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
}

.m04-range-line input[type="number"] {
  background: var(--m04-bg-soft);
  border: 1px solid var(--m04-border);
  border-radius: 6px;
  color: var(--m04-text);
  font: inherit;
  padding: 0.3rem 0.45rem;
  width: 100%;
}

.m04-check-line {
  align-items: center;
  display: flex;
  gap: 0.45rem;
  margin: 0.35rem 0;
}

.m04-note {
  color: var(--m04-muted);
  font-size: 0.82rem;
  line-height: 1.45;
  margin: 0.35rem 0 0;
}

.m04-stats-banner {
  display: grid;
  gap: 0.25rem;
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.m04-stat {
  background: var(--m04-bg-base);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  min-width: 0;
  padding: 0.38rem 0.45rem;
}

.m04-stat-label {
  color: var(--m04-muted);
  display: block;
  font-size: 0.53rem;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0;
  text-transform: uppercase;
}

.m04-stat-value {
  color: var(--m04-text);
  display: block;
  font-size: clamp(0.74rem, 0.9vw, 0.92rem);
  font-weight: 700;
  line-height: 1.06;
  margin-top: 0.08rem;
  overflow-wrap: anywhere;
}

.m04-chart-stage {
  background: var(--m04-bg-base);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  min-height: 600px;
  overflow: hidden;
  position: relative;
}

.m04-chart-svg {
  display: block;
  height: 620px;
  width: 100%;
}

.m04-axis,
.m04-grid {
  stroke: var(--m04-border);
  stroke-width: 1;
}

.m04-axis-label,
.m04-label {
  fill: var(--m04-text-secondary);
  font-size: 12px;
}

.m04-title-label {
  fill: var(--m04-text);
  font-size: 14px;
  font-weight: 700;
}

.m04-pop-bar {
  fill: rgba(100, 116, 139, 0.38);
  stroke: rgba(100, 116, 139, 0.75);
}

.m04-mean-bar {
  fill: rgba(37, 99, 235, 0.55);
  stroke: rgba(15, 63, 140, 0.8);
}

.m04-mean-bar-compare {
  fill: rgba(100, 116, 139, 0.35);
  stroke: rgba(100, 116, 139, 0.8);
}

.m04-mean-bar:focus-visible,
.m04-mean-point:focus-visible {
  outline: 2px solid var(--m04-primary);
}

.m01-kw {
  font-weight: 700;
  color: var(--m04-primary);
  border-bottom: 1px dotted var(--m04-primary);
}

.m04-curve {
  fill: none;
  stroke: var(--m04-theoretical);
  stroke-dasharray: 6 5;
  stroke-linecap: round;
  stroke-width: 2;
}

.m04-density-fill {
  fill: rgba(217, 119, 6, 0.08);
}

.m04-reference-line {
  stroke: var(--m04-sample-mean);
  stroke-width: 1.6;
}

.m04-reference-line-soft {
  stroke: rgba(15, 63, 140, 0.35);
  stroke-dasharray: 4 5;
  stroke-width: 1;
}

.m04-current-line {
  stroke: var(--m04-sample);
  stroke-width: 2;
}

.m04-trajectory {
  fill: none;
  stroke: var(--m04-sample);
  stroke-dasharray: 5 5;
  stroke-width: 1.8;
}

.m04-pop-dot {
  fill: var(--m04-population);
  opacity: 0.4;
}

.m04-sample-dot {
  fill: var(--m04-sample);
  stroke: #ffffff;
  stroke-width: 1.5;
}

.m04-mean-point {
  fill: var(--m04-sample-mean);
  stroke: #ffffff;
  stroke-width: 1.5;
}

.m04-extreme {
  fill: var(--m04-warning);
  opacity: 0.65;
}

.m04-legend {
  align-items: center;
  color: var(--m04-text-secondary);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.84rem;
  gap: 0.8rem;
}

.m04-swatch {
  border-radius: 99px;
  display: inline-block;
  height: 0.7rem;
  margin-right: 0.3rem;
  vertical-align: -0.05rem;
  width: 0.7rem;
}

.m04-interpretation {
  background: var(--m04-bg-soft);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  color: var(--m04-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  padding: 1rem;
}

.m04-sample-panel {
  color: var(--m04-text-secondary);
  display: grid;
  font-size: 0.92rem;
  gap: 0.55rem;
  line-height: 1.5;
}

.m04-sample-panel strong,
.m04-tour-panel strong {
  color: var(--m04-text);
}

.m04-inline-formula {
  background: var(--m04-primary-soft);
  border-radius: 5px;
  color: var(--m04-sample-mean);
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  padding: 0.08rem 0.3rem;
}

.m04-explainer-section {
  background: var(--m04-bg-base);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  padding: 1rem;
}

.m04-explainer-steps {
  display: grid;
  gap: 0.45rem;
}

.m04-explainer-step {
  background: transparent;
  border: 1px solid var(--m04-border);
  border-radius: 6px;
  color: var(--m04-text);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  min-height: 2.35rem;
  padding: 0.45rem 0.65rem;
  text-align: left;
}

.m04-explainer-step[aria-pressed="true"] {
  background: var(--m04-primary);
  color: #ffffff;
}

.m04-explainer-stage {
  background: var(--m04-bg-soft);
  border: 1px solid var(--m04-border);
  border-radius: var(--m04-radius);
  min-height: 280px;
  padding: 1rem;
}

.m04-explainer-stage h3 {
  margin-top: 0;
}

.m04-explainer-svg {
  display: block;
  height: 190px;
  width: 100%;
}

.m04-interpretation-rows {
  border-top: 1px solid var(--m04-border);
}

.m04-interpretation-row {
  border-bottom: 1px solid var(--m04-border);
  color: var(--m04-text-secondary);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  line-height: 1.65;
  padding: 0.9rem 0;
}

.m04-interpretation-row strong {
  color: var(--m04-text);
}

@media (max-width: 1100px) {
  .m04-lab-layout {
    gap: 1rem !important;
    grid-template-columns: minmax(250px, 280px) minmax(0, 1fr) !important;
  }

  .m04-stats-banner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .m04-chart-svg {
    height: 560px;
  }
}

@media (max-width: 860px) {
  .m04-lab-layout,
  .m04-explainer-section,
  .m04-sequence-flow {
    grid-template-columns: 1fr !important;
  }

  .m04-lab-sidebar,
  .m04-lab-main {
    grid-column: auto !important;
  }

  .m04-chart-stage {
    min-height: 520px;
  }

  .m04-chart-svg {
    height: 520px;
  }
}

@media (max-width: 560px) {
  .m04-module-intro {
    padding-inline: 0.85rem;
  }

  .m04-lab-surface.m04-lab-breakout,
  #m04-lab-root {
    width: calc(100vw - 1rem) !important;
  }

  .m04-lab-surface {
    padding: 0.75rem;
  }

  .m04-stats-banner,
  .m04-range-line,
  .m04-interpretation-row {
    grid-template-columns: 1fr;
  }

  .m04-chart-stage {
    min-height: 500px;
  }

  .m04-chart-svg {
    height: 500px;
  }

}

@media (prefers-reduced-motion: reduce) {
  .m04-chart-svg *,
  .m04-explainer-svg * {
    transition: none !important;
  }
}