/* Scene 2 — What a segmentation dataset looks like.

   Layout:
     hero
     sample gallery (6 image|label pairs in a wrap-grid)
     class legend
     "data generator" inset (single bigger image|label pair + button)
     histogram + caveat
     caption + controls */

.s2-root .s2-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.s2-hero h1 { font-size: 28px; }
.s2-hero .lede em {
  font-style: italic;
  color: var(--ink);
}

.s2-section-title {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin: 0 0 8px;
}

/* ---------------------------------------------------------------------------
   Sample gallery
   --------------------------------------------------------------------------- */

.s2-gallery-wrap {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 12px 14px 14px;
}

.s2-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.s2-pair {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  padding: 6px 4px 8px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
}

.s2-pair-idx {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  color: var(--ink-secondary);
  align-self: flex-start;
  padding-left: 4px;
}

.s2-pair-imgs {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.s2-pair-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.s2-pair-sub {
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
}

.s2-tile-host canvas {
  image-rendering: pixelated;
  border: 1px solid var(--rule);
  border-radius: 2px;
}

/* ---------------------------------------------------------------------------
   Legend
   --------------------------------------------------------------------------- */

.s2-legend {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  padding: 8px 4px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  opacity: 0.4;
  transition: opacity 220ms ease-out;
}
.s2-legend.s2-visible { opacity: 1; }

.s2-legend-item {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-secondary);
}

.s2-swatch {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  background: var(--ink-secondary);
}
.s2-swatch.class-sky    { background: var(--class-sky); }
.s2-swatch.class-grass  { background: var(--class-grass); }
.s2-swatch.class-sun    { background: var(--class-sun); }
.s2-swatch.class-tree   { background: var(--class-tree); }
.s2-swatch.class-person { background: var(--class-person); }

.s2-legend-name {
  color: var(--ink);
  font-weight: 500;
}
.s2-legend-int {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  color: var(--ink-secondary);
}

/* ---------------------------------------------------------------------------
   Data-generator inset
   --------------------------------------------------------------------------- */

.s2-gen-wrap {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 12px 14px 14px;
  opacity: 0.45;
  transition: opacity 220ms ease-out;
}
.s2-gen-wrap.s2-visible { opacity: 1; }

.s2-gen-inner {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}

.s2-gen-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.s2-gen-imgs {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.s2-gen-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.s2-gen-host canvas {
  image-rendering: pixelated;
  border: 1px solid var(--rule);
  border-radius: 2px;
}

.s2-gen-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.s2-gen-btn {
  background: var(--cnn-pos);
  color: white;
  border: 1px solid var(--cnn-pos);
  border-radius: 3px;
  padding: 4px 12px;
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
}
.s2-gen-btn:hover { filter: brightness(1.06); }
.s2-gen-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: none;
}

.s2-gen-idx {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--ink);
}

.s2-gen-note {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 12.5px;
  color: var(--ink-secondary);
  border-left: 2px solid var(--rule);
  padding: 4px 10px;
  margin: 10px 0 0;
}
.s2-gen-note strong {
  font-style: normal;
  color: var(--ink);
}
.s2-gen-note code {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11.5px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 1px 4px;
  color: var(--ink);
  font-style: normal;
}

/* ---------------------------------------------------------------------------
   Histogram
   --------------------------------------------------------------------------- */

.s2-hist-wrap {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 12px 14px 14px;
  opacity: 0.45;
  transition: opacity 220ms ease-out;
}
.s2-hist-wrap.s2-visible { opacity: 1; }

.s2-hist-host {
  display: block;
  overflow-x: auto;
}

.s2-hist-note {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 12.5px;
  color: var(--ink-secondary);
  border-left: 2px solid var(--rule);
  padding: 4px 10px;
  margin: 8px 0 0;
}
.s2-hist-note strong {
  font-style: normal;
  color: var(--ink);
}

/* ---------------------------------------------------------------------------
   Caption
   --------------------------------------------------------------------------- */

.s2-caption { margin-top: 4px; }

/* ---------------------------------------------------------------------------
   Narrow viewport fallback
   --------------------------------------------------------------------------- */

@media (max-width: 720px) {
  .s2-gen-inner { flex-direction: column; }
  .s2-pair-imgs { flex-direction: column; align-items: center; }
}