/* Scene 8 -- "Walking up the right side of the U."

   No skip arcs! The decoder is laid out as a horizontal walk:
     bottleneck (16x16x64) -> dec2 (32x32x32) -> dec1 (64x64x16)
   then the prediction overlay below. */

.s8-root .s8-wrap {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.s8-hero h1 { font-size: 28px; }
.s8-hero .lede em { font-style: italic; color: var(--ink); }

.s8-mini-host { align-self: flex-start; }

/* ---------------------------------------------------------------------------
   Sample selector strip
   --------------------------------------------------------------------------- */

.s8-selector {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 4px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.s8-selector-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  flex: 0 0 auto;
}
.s8-selector-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  flex: 1 1 auto;
}
.s8-thumb {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 3px;
  cursor: pointer;
  transition: border-color 120ms ease-out, transform 120ms ease-out;
}
.s8-thumb:hover { border-color: var(--ink-secondary); }
.s8-thumb.active {
  border-color: var(--cnn-pos);
  box-shadow: 0 0 0 2px var(--cnn-pos);
  transform: translateY(-1px);
}
.s8-thumb-host { display: block; }
.s8-thumb canvas { display: block; image-rendering: pixelated; }

/* ---------------------------------------------------------------------------
   Architecture diagram (no skips)
   --------------------------------------------------------------------------- */

.s8-arch {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto;
  align-items: center;
  justify-items: center;
  gap: 12px;
  padding: 28px 36px;
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.s8-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.s8-col-bot { grid-column: 1; }
.s8-col-dec2 { grid-column: 3; }
.s8-col-dec1 { grid-column: 5; }

/* Cards (one per U-Net level). */
.s8-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  opacity: 0.45;
  transition: opacity 220ms ease-out, border-color 220ms ease-out;
}
.s8-card.s8-half {
  opacity: 0.75;
  border-style: dashed;
}
.s8-card.s8-visible {
  opacity: 1;
  border-color: var(--ink-secondary);
  border-style: solid;
}

.s8-card-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
}
.s8-card-name {
  font-weight: 600;
  color: var(--ink);
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
}
.s8-card-sub {
  font-style: italic;
  text-transform: none;
  letter-spacing: 0;
  font-size: 11px;
}
.s8-card-body {
  position: relative;
  background: var(--bg);
}
.s8-card-body canvas {
  display: block;
  image-rendering: pixelated;
}

/* ---------------------------------------------------------------------------
   Flow arrows (SVG overlay)
   --------------------------------------------------------------------------- */

.s8-arrows {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  overflow: visible;
}
.s8-arrows svg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  overflow: visible;
  isolation: isolate;
}

/* Upsample arrows (the transposed convs): amber, dashed, prominent. */
.s8-up {
  stroke: var(--cnn-accent);
  stroke-width: 2.4;
  stroke-dasharray: 8 4;
  fill: none;
  opacity: 0;
  transition: opacity 220ms ease-out;
}
:root[data-theme="light"] .s8-up { stroke: #8d5f1f; }

/* Conv-block arrows: thinner, ink-coloured. */
.s8-conv {
  stroke: var(--ink-secondary);
  stroke-width: 1.6;
  fill: none;
  opacity: 0;
  transition: opacity 220ms ease-out;
}
.s8-up-label,
.s8-conv-label {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 12px;
  fill: var(--ink-secondary);
  opacity: 0;
  transition: opacity 220ms ease-out;
}
.s8-up-label { fill: var(--cnn-accent); }
:root[data-theme="light"] .s8-up-label { fill: #8d5f1f; }

#s8-arrow path { fill: var(--cnn-accent); }
:root[data-theme="light"] #s8-arrow path { fill: #8d5f1f; }

.s8-arch.s8-up1-lit .s8-flow-u1 .s8-up,
.s8-arch.s8-up1-lit .s8-flow-u1 .s8-up-label { opacity: 0.95; }
.s8-arch.s8-c1-lit .s8-flow-c1 .s8-conv,
.s8-arch.s8-c1-lit .s8-flow-c1 .s8-conv-label { opacity: 0.85; }
.s8-arch.s8-up2-lit .s8-flow-u2 .s8-up,
.s8-arch.s8-up2-lit .s8-flow-u2 .s8-up-label { opacity: 0.95; }
.s8-arch.s8-c2-lit .s8-flow-c2 .s8-conv,
.s8-arch.s8-c2-lit .s8-flow-c2 .s8-conv-label { opacity: 0.85; }
.s8-arch.s8-out-lit .s8-flow-out .s8-conv,
.s8-arch.s8-out-lit .s8-flow-out .s8-conv-label { opacity: 0.85; }

/* ---------------------------------------------------------------------------
   Prediction overlay panel
   --------------------------------------------------------------------------- */

.s8-overlay {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
  margin-top: 8px;
}
.s8-ov-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.s8-ov-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
}
.s8-ov-host {
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--card-bg);
}
.s8-ov-host.s8-visible { border-color: var(--ink-secondary); }
.s8-ov-host canvas { display: block; image-rendering: pixelated; }

/* ---------------------------------------------------------------------------
   Class legend
   --------------------------------------------------------------------------- */

.s8-legend {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 8px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.s8-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.s8-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 2px;
  background: currentColor;
  border: 1px solid color-mix(in srgb, currentColor 80%, transparent);
}
.s8-legend-name {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-transform: lowercase;
}

/* ---------------------------------------------------------------------------
   Caption + honesty footnote
   --------------------------------------------------------------------------- */

.s8-caption {
  margin: 4px 4px 0;
  text-align: center;
  font-size: 14.5px;
  min-height: 1.4em;
}
.s8-honesty {
  margin: 6px 4px 0;
  font-size: 12px;
  color: var(--ink-secondary);
  font-style: italic;
  text-align: center;
}
.s8-honesty em { color: var(--ink); font-style: italic; }
.s8-honesty-tag {
  font-style: normal;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-secondary);
  margin-right: 4px;
}
.s8-controls { margin-top: 6px; }

/* ---------------------------------------------------------------------------
   Responsive
   --------------------------------------------------------------------------- */

@media (max-width: 900px) {
  .s8-overlay { grid-template-columns: 1fr; }
  .s8-arch {
    grid-template-columns: 1fr;
  }
  .s8-col-bot,
  .s8-col-dec2,
  .s8-col-dec1 {
    grid-column: 1;
  }
  .s8-arrows { display: none; }
}