/* Visual teaching components share the game room palette in both themes. */
#ac-app .ac-lesson-figure,
#ac-app .ac-lesson-lab {
  --ac-visual-ink: var(--bo-primary);
  --ac-visual-wash: var(--bo-blue-soft);
  box-sizing: border-box;
  margin: 1.35rem 0;
  border: 1px solid var(--bo-line);
  border-radius: 12px;
  background: var(--bo-paper);
  color: var(--bo-text);
  overflow: hidden;
}

#ac-app .ac-lesson-figure {
  padding: clamp(1rem, 3vw, 1.5rem);
}

#ac-app .ac-lesson-visual-title {
  margin: 0 0 1.15rem;
  color: var(--bo-text);
  font: 700 1rem/1.4 var(--bo-font-ui);
  letter-spacing: -.015em;
  text-transform: none;
}

#ac-app .ac-lesson-figure figcaption {
  margin-top: 1.15rem;
  padding-top: .9rem;
  border-top: 1px solid var(--bo-line);
  color: var(--bo-muted);
  font: 400 .82rem/1.6 var(--bo-font-ui);
}

#ac-app .ac-lesson-tone--good {
  --ac-visual-ink: var(--bo-green);
  --ac-visual-wash: var(--bo-green-soft);
}

#ac-app .ac-lesson-tone--warn {
  --ac-visual-ink: var(--bo-gold);
  --ac-visual-wash: var(--bo-brass-soft);
}

#ac-app .ac-lesson-tone--neutral {
  --ac-visual-ink: var(--bo-primary);
  --ac-visual-wash: var(--bo-blue-soft);
}

#ac-app .ac-lesson-bars {
  display: grid;
  gap: 1rem;
}

#ac-app .ac-lesson-bar-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .8rem;
  margin-bottom: .4rem;
  font-size: .88rem;
  line-height: 1.45;
}

#ac-app .ac-lesson-bar-label strong {
  flex-shrink: 0;
  color: var(--ac-visual-ink);
  font: 600 .84rem/1.5 var(--bo-font-mono);
  font-variant-numeric: tabular-nums;
}

#ac-app .ac-lesson-bar-track {
  display: block;
  height: 11px;
  border-radius: 3px;
  background: var(--bo-line);
  overflow: hidden;
}

#ac-app .ac-lesson-bar-track i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--ac-visual-ink);
}

#ac-app .ac-lesson-bar-row small {
  display: block;
  margin-top: .35rem;
  color: var(--bo-muted);
  font-size: .76rem;
  line-height: 1.5;
}

#ac-app .ac-lesson-flow,
#ac-app .ac-lesson-checklist,
#ac-app .ac-lesson-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

#ac-app .ac-lesson-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
}

#ac-app .ac-lesson-flow li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  padding: 1rem;
  border: 1px solid var(--bo-line);
  border-radius: 8px;
  background: var(--bo-surface);
}

#ac-app .ac-lesson-step-number {
  display: inline-flex;
  flex: 0 0 2rem;
  align-items: center;
  justify-content: center;
  height: 2rem;
  border-radius: 50%;
  background: var(--ac-visual-wash);
  color: var(--ac-visual-ink);
  font: 600 .73rem/1 var(--bo-font-mono);
}

#ac-app .ac-lesson-flow strong,
#ac-app .ac-lesson-checklist strong,
#ac-app .ac-lesson-timeline strong {
  display: block;
  color: var(--bo-text);
  font-size: .9rem;
  line-height: 1.45;
}

#ac-app .ac-lesson-flow p,
#ac-app .ac-lesson-checklist p,
#ac-app .ac-lesson-timeline p,
#ac-app .ac-lesson-comparison-card p {
  margin: .4rem 0 0;
  color: var(--bo-muted);
  font-size: .84rem;
  line-height: 1.6;
}

#ac-app .ac-lesson-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
}

#ac-app .ac-lesson-comparison-card {
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid var(--bo-line);
  border-top: 3px solid var(--ac-visual-ink);
  border-radius: 7px;
  background: var(--bo-surface);
  overflow-wrap: anywhere;
}

#ac-app .ac-lesson-card-label {
  display: block;
  color: var(--bo-text);
  font-size: .85rem;
  line-height: 1.5;
}

#ac-app .ac-lesson-card-value {
  display: block;
  margin-top: .55rem;
  color: var(--ac-visual-ink);
  font: 650 clamp(1.15rem, 3vw, 1.45rem)/1.25 var(--bo-font-ui);
  letter-spacing: -.025em;
  font-variant-numeric: tabular-nums;
}

#ac-app .ac-lesson-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--bo-line);
  border-radius: 6px;
  scrollbar-color: var(--bo-muted) var(--bo-paper);
}

#ac-app .ac-lesson-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .83rem;
  line-height: 1.55;
}

#ac-app .ac-lesson-table th,
#ac-app .ac-lesson-table td {
  padding: .8rem .9rem;
  border: 0;
  border-bottom: 1px solid var(--bo-line);
  color: var(--bo-text);
  background: transparent;
  font-family: var(--bo-font-ui);
  font-size: inherit;
  line-height: inherit;
  letter-spacing: 0;
  text-align: left;
  text-transform: none;
  vertical-align: top;
  white-space: normal;
}

#ac-app .ac-lesson-table thead th {
  background: var(--bo-blue-soft);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .01em;
  text-transform: none;
}

#ac-app .ac-lesson-table tbody th {
  min-width: 110px;
  font-weight: 600;
}

#ac-app .ac-lesson-table tbody tr:nth-child(even) {
  background: var(--bo-surface);
}

#ac-app .ac-lesson-table tbody tr:last-child > * {
  border-bottom: 0;
}

#ac-app .ac-lesson-timeline {
  position: relative;
}

#ac-app .ac-lesson-timeline li {
  position: relative;
  margin-left: .4rem;
  padding: 0 0 1.5rem 1.5rem;
  border-left: 2px solid var(--bo-line);
}

#ac-app .ac-lesson-timeline li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

#ac-app .ac-lesson-timeline-dot {
  position: absolute;
  top: .2rem;
  left: -7px;
  width: 12px;
  height: 12px;
  border: 3px solid var(--bo-paper);
  border-radius: 50%;
  background: var(--ac-visual-ink);
  box-shadow: 0 0 0 1px var(--ac-visual-ink);
}

#ac-app .ac-lesson-timeline-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .4rem .75rem;
}

#ac-app .ac-lesson-time {
  padding: .18rem .5rem;
  border-radius: 4px;
  background: var(--ac-visual-wash);
  color: var(--ac-visual-ink);
  font: 600 .77rem/1.5 var(--bo-font-mono);
  font-variant-numeric: tabular-nums;
}

#ac-app .ac-lesson-checklist {
  display: grid;
  gap: .95rem;
}

#ac-app .ac-lesson-checklist li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
}

#ac-app .ac-lesson-check-icon {
  display: grid;
  flex: 0 0 1.6rem;
  height: 1.6rem;
  place-items: center;
  border-radius: 50%;
  background: var(--bo-green-soft);
  color: var(--bo-green);
  font-size: .82rem;
  font-weight: 700;
}

#ac-app .ac-lesson-lab {
  border-top: 3px solid var(--bo-brass);
  background: var(--bo-surface);
}

#ac-app .ac-lesson-lab-header,
#ac-app .ac-lesson-controls,
#ac-app .ac-lesson-lab-output {
  padding: clamp(1rem, 3vw, 1.5rem);
}

#ac-app .ac-lesson-lab-header {
  background: var(--bo-paper);
}

#ac-app .ac-lesson-lab-eyebrow {
  color: var(--bo-gold);
  font: 600 .65rem/1.5 var(--bo-font-mono);
  letter-spacing: .07em;
  text-transform: uppercase;
}

#ac-app .ac-lesson-lab-header h4 {
  margin: .5rem 0 .6rem;
  color: var(--bo-text);
  font: 700 1.22rem/1.35 var(--bo-font-ui);
  letter-spacing: -.025em;
  text-transform: none;
}

#ac-app .ac-lesson-lab-header p {
  margin: 0;
  color: var(--bo-muted);
  font-size: .88rem;
  line-height: 1.65;
}

#ac-app .ac-lesson-controls {
  display: grid;
  gap: 1.05rem;
  border-top: 1px solid var(--bo-line);
  border-bottom: 1px solid var(--bo-line);
}

#ac-app .ac-lesson-control-label {
  display: block;
  margin-bottom: .5rem;
  color: var(--bo-text);
  font-size: .81rem;
  font-weight: 600;
  line-height: 1.5;
}

#ac-app .ac-lesson-options {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

#ac-app .ac-lesson-option {
  min-height: 44px;
  padding: .55rem .85rem;
  border: 1px solid var(--bo-line);
  border-radius: 6px;
  background: var(--bo-paper);
  color: var(--bo-text);
  font: 600 .8rem/1.5 var(--bo-font-ui);
  text-align: center;
  cursor: pointer;
  transition: background-color .15s, border-color .15s;
}

#ac-app .ac-lesson-option:hover {
  border-color: var(--bo-primary);
  background: var(--bo-blue-soft);
}

#ac-app .ac-lesson-option[aria-pressed="true"] {
  border-color: var(--bo-primary);
  background: var(--bo-primary);
  color: var(--bo-on-primary);
  box-shadow: inset 0 0 0 1px var(--bo-primary);
}

#ac-app .ac-lesson-option:focus-visible,
#ac-app .ac-lesson-table-wrap:focus-visible {
  outline: 3px solid var(--bo-gold);
  outline-offset: 3px;
}

#ac-app .ac-lesson-lab-output > :first-child {
  margin-top: 0;
}

#ac-app .ac-lesson-lab-output > :last-child {
  margin-bottom: 0;
}

#ac-app .ac-lesson-lab-output .ac-lesson-figure {
  border-radius: 8px;
}

#ac-app .ac-lesson-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 155px), 1fr));
  gap: .75rem;
  margin: 1rem 0;
}

#ac-app .ac-lesson-stat {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--bo-line);
  border-radius: 8px;
  background: var(--bo-paper);
}

#ac-app .ac-lesson-stat > span {
  display: block;
  color: var(--bo-muted);
  font-size: .74rem;
  line-height: 1.5;
}

#ac-app .ac-lesson-stat strong {
  display: block;
  margin: .35rem 0;
  color: var(--ac-visual-ink);
  font: 700 clamp(1.12rem, 3vw, 1.5rem)/1.2 var(--bo-font-ui);
  letter-spacing: -.025em;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

#ac-app .ac-lesson-stat small {
  display: block;
  color: var(--bo-muted);
  font-size: .73rem;
  line-height: 1.55;
}

#ac-app .ac-lesson-lab .ac-lesson-result {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--ac-visual-ink);
  border-radius: 0 6px 6px 0;
  background: var(--ac-visual-wash);
  color: var(--bo-text);
  font-size: .87rem;
  line-height: 1.7;
}

#ac-app .ac-lesson-lab-note {
  margin: 0;
  padding: 1rem clamp(1rem, 3vw, 1.5rem);
  border-top: 1px solid var(--bo-line);
  background: var(--bo-paper);
  color: var(--bo-muted);
  font-size: .73rem;
  line-height: 1.65;
}

#ac-app .ac-lesson-formula {
  margin: 1rem 0;
  padding: 1.15rem;
  border: 1px solid var(--bo-line);
  border-radius: 8px;
  background: var(--bo-blue-soft);
}

#ac-app .ac-lesson-formula span {
  display: block;
  margin-bottom: .5rem;
  color: var(--bo-muted);
  font-size: .76rem;
}

#ac-app .ac-lesson-formula strong {
  display: block;
  color: var(--bo-text);
  font: 600 clamp(.98rem, 2.8vw, 1.25rem)/1.65 var(--bo-font-mono);
  overflow-wrap: anywhere;
}

#ac-app .ac-lesson-record {
  margin: 0 0 1.15rem;
  padding: 1.15rem;
  border: 1px solid var(--bo-line);
  border-left: 3px solid var(--bo-gold);
  border-radius: 0 8px 8px 0;
  background: var(--bo-paper);
  color: var(--bo-text);
  font: 400 1rem/1.8 var(--bo-font-ui);
}

#ac-app .ac-lesson-evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}

#ac-app .ac-lesson-evidence-item {
  display: flex;
  gap: .7rem;
  align-items: flex-start;
  padding: .9rem;
  border: 1px solid var(--bo-line);
  border-radius: 7px;
  background: var(--ac-visual-wash);
}

#ac-app .ac-lesson-evidence-marker {
  color: var(--ac-visual-ink);
  font-weight: 700;
}

#ac-app .ac-lesson-evidence-item strong {
  display: block;
  color: var(--bo-text);
  font-size: .79rem;
  line-height: 1.5;
}

#ac-app .ac-lesson-evidence-item small {
  display: block;
  margin-top: .2rem;
  color: var(--ac-visual-ink);
  font-size: .73rem;
}

#ac-app .ac-lesson-small-note {
  margin: 0 0 .9rem;
  color: var(--bo-muted);
  font-size: .8rem;
  line-height: 1.65;
}

#ac-app .ac-lesson-equation {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr);
  align-items: center;
  gap: .5rem;
  padding: 1rem .75rem;
  border: 1px solid var(--bo-line);
  border-radius: 8px;
  background: var(--bo-blue-soft);
  text-align: center;
}

#ac-app .ac-lesson-equation > div > span {
  display: block;
  color: var(--bo-muted);
  font-size: .71rem;
  line-height: 1.4;
}

#ac-app .ac-lesson-equation strong {
  display: block;
  margin-top: .4rem;
  color: var(--bo-text);
  font: 650 clamp(.94rem, 2.8vw, 1.4rem)/1.3 var(--bo-font-ui);
  font-variant-numeric: tabular-nums;
}

#ac-app .ac-lesson-equation-sign {
  color: var(--bo-gold);
  font-size: 1.25rem;
}

#ac-app .ac-lesson-floorplans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: .85rem;
}

#ac-app .ac-lesson-floorplan {
  min-width: 0;
  padding: .9rem;
  border: 1px solid var(--bo-line);
  border-radius: 8px;
  background: var(--bo-surface);
}

#ac-app .ac-lesson-floorplan h5 {
  margin: 0 0 .6rem;
  color: var(--bo-text);
  font: 700 .9rem/1.4 var(--bo-font-ui);
  letter-spacing: -.015em;
  text-transform: none;
}

#ac-app .ac-lesson-floorplan p {
  margin: .8rem 0 0;
  color: var(--bo-muted);
  font-size: .8rem;
  line-height: 1.65;
}

#ac-app .ac-lesson-floor-map {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 3;
}

#ac-app .ac-lesson-floor-map svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

#ac-app .ac-lesson-floor-fill--one {
  fill: var(--bo-blue-soft);
}

#ac-app .ac-lesson-floor-fill--two {
  fill: var(--bo-green-soft);
}

#ac-app .ac-lesson-floor-fill--three {
  fill: var(--bo-brass-soft);
}

#ac-app .ac-lesson-floor-corridor {
  fill: var(--bo-paper);
}

#ac-app .ac-lesson-floor-wall,
#ac-app .ac-lesson-floor-partition,
#ac-app .ac-lesson-floor-application,
#ac-app .ac-lesson-floor-supply {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

#ac-app .ac-lesson-floor-wall {
  stroke: var(--bo-text);
  stroke-width: 1.8;
}

#ac-app .ac-lesson-floor-partition {
  stroke: var(--bo-muted);
  stroke-width: 1;
  stroke-dasharray: 3 4;
}

#ac-app .ac-lesson-floor-application {
  stroke: var(--bo-green);
  stroke-width: 1.8;
}

#ac-app .ac-lesson-floor-supply {
  stroke: var(--bo-gold);
  stroke-width: 1.8;
  stroke-dasharray: 5 4;
}

#ac-app .ac-lesson-floor-zone,
#ac-app .ac-lesson-floor-marker {
  position: absolute;
  display: grid;
  width: 1.4rem;
  height: 1.4rem;
  place-items: center;
  border: 1px solid var(--bo-line);
  border-radius: 50%;
  background: var(--bo-surface);
  color: var(--bo-text);
  font: 700 .7rem/1 var(--bo-font-mono);
  transform: translate(-50%, -50%);
}

#ac-app .ac-lesson-floor-marker {
  width: 1.25rem;
  height: 1.25rem;
  border-color: var(--bo-primary);
  border-radius: 4px;
  font-size: .65rem;
}

#ac-app .ac-lesson-floor-marker--mix {
  background: var(--bo-primary);
  color: var(--bo-on-primary);
}

#ac-app .ac-lesson-floor-marker--exit {
  background: var(--bo-paper);
  color: var(--bo-primary);
}

#ac-app .ac-lesson-floor-legend {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem 1rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

#ac-app .ac-lesson-floor-legend li {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  color: var(--bo-muted);
  font-size: .72rem;
  line-height: 1.5;
}

#ac-app .ac-lesson-floor-legend-zone,
#ac-app .ac-lesson-floor-legend-marker {
  display: inline-grid;
  width: 1.1rem;
  height: 1.1rem;
  place-items: center;
  border: 1px solid var(--bo-line);
  border-radius: 50%;
  background: var(--bo-surface);
  color: var(--bo-text);
  font: 600 .62rem/1 var(--bo-font-mono);
}

#ac-app .ac-lesson-floor-legend-marker {
  border-color: var(--bo-primary);
  border-radius: 3px;
  background: var(--bo-primary);
  color: var(--bo-on-primary);
}

#ac-app .ac-lesson-floor-legend-marker--exit {
  background: var(--bo-paper);
  color: var(--bo-primary);
}

#ac-app .ac-lesson-floor-legend-line {
  display: inline-block;
  width: 1.3rem;
  border-top: 2px solid var(--bo-green);
}

#ac-app .ac-lesson-floor-legend-line--supply {
  border-color: var(--bo-gold);
  border-top-style: dashed;
}

#ac-app .ac-lesson-floor-note {
  margin: .9rem 0 0;
  color: var(--bo-muted);
  font-size: .75rem;
  line-height: 1.65;
}

@media (max-width: 580px) {
  #ac-app .ac-lesson-flow,
  #ac-app .ac-lesson-comparison,
  #ac-app .ac-lesson-evidence-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  #ac-app .ac-lesson-bar-label {
    flex-wrap: wrap;
    gap: .2rem .6rem;
  }

  #ac-app .ac-lesson-options > button {
    flex: 1 1 auto;
  }

  #ac-app .ac-lesson-table th,
  #ac-app .ac-lesson-table td {
    padding: .7rem;
  }

  #ac-app .ac-lesson-equation {
    gap: .3rem;
    padding: 1rem .5rem;
  }
}

/* Nested figures and labs stay readable without forcing the dialog sideways. */
#ac-app :is(.ac-lesson-figure, .ac-lesson-lab, .ac-lesson-lab-output, .ac-lesson-table-wrap),
#ac-app .ac-lesson-flow li > div,
#ac-app .ac-lesson-evidence-item > span {
  min-width: 0;
}

#ac-app .ac-lesson-table-wrap {
  max-width: 100%;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 600px) {
  #ac-app .ac-lesson-figure {
    padding: 16px 12px;
  }

  #ac-app .ac-lesson-lab-output {
    padding: 16px 12px;
  }

  #ac-app .ac-lesson-lab-output .ac-lesson-figure {
    padding: 14px 12px;
  }

  #ac-app .ac-lesson-visual-title {
    font-size: .98rem;
  }

  #ac-app .ac-lesson-figure figcaption,
  #ac-app .ac-lesson-floorplan p,
  #ac-app .ac-lesson-flow p,
  #ac-app .ac-lesson-comparison-card p,
  #ac-app .ac-lesson-timeline p {
    font-size: .88rem;
  }

  #ac-app .ac-lesson-floorplans {
    grid-template-columns: minmax(0, 1fr);
  }

  #ac-app .ac-lesson-floorplan {
    padding: 12px;
  }

  #ac-app .ac-lesson-option {
    padding: 10px 12px;
    font-size: .875rem;
  }

  /* Two columns can wrap naturally; larger comparisons keep a readable width. */
  #ac-app .ac-lesson-table:has(thead th:nth-child(3)) {
    min-width: 30rem;
  }

  #ac-app .ac-lesson-table tbody th {
    min-width: 96px;
  }
}

@media (max-width: 480px) {
  #ac-app .ac-lesson-equation {
    grid-template-columns: minmax(0, 1fr);
    gap: .45rem;
    padding: 16px;
  }

  #ac-app .ac-lesson-equation strong {
    margin-top: .2rem;
    font-size: 1.2rem;
  }

  #ac-app .ac-lesson-equation > div > span {
    font-size: .8rem;
  }

  #ac-app .ac-lesson-formula,
  #ac-app .ac-lesson-record {
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #ac-app .ac-lesson-option {
    transition: none;
  }
}