/* Scene 1 — From one label to a label per pixel.

   Layout:
     hero
     two side-by-side panels (classifier | segmenter)
     class legend
     two side-by-side KaTeX formula blocks (revealed at step 4)
     caption + honesty footnote + step controls */

.s1-root .s1-wrap {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.s1-hero h1 { font-size: 28px; }
.s1-hero .lede em {
  font-style: italic;
  color: var(--ink);
}

.s1-mini-host { align-self: flex-start; }

/* ---------------------------------------------------------------------------
   Two panels (classifier | segmenter)
   --------------------------------------------------------------------------- */

.s1-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: stretch;
  margin-top: 6px;
}

.s1-panel {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 100%;
}

.s1-panel-title {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 18px;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.s1-panel-sub {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin-top: -6px;
}

.s1-panel-foot {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 13.5px;
  color: var(--ink-secondary);
  margin: 4px 0 0;
}
.s1-panel-foot code {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--ink);
}

/* ---------------------------------------------------------------------------
   Flow row inside each panel: input → output
   --------------------------------------------------------------------------- */

.s1-flow-row {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
}

.s1-flow-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  flex: 0 0 auto;
}

.s1-flow-cell .col-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
}

.s1-arrow {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 28px;
  color: var(--ink-secondary);
  line-height: 1;
  flex: 0 0 auto;
  user-select: none;
}

.s1-input-host canvas,
.s1-output-host canvas {
  image-rendering: pixelated;
  border: 1px solid var(--rule);
  border-radius: 3px;
}

/* ---------------------------------------------------------------------------
   Bar chart (per-class probabilities) — used both for classifier output
   and for the per-pixel hover inspector on the right.
   --------------------------------------------------------------------------- */

.s1-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 220px;
  max-width: 100%;
}

.s1-bar-row {
  display: grid;
  grid-template-columns: 60px 1fr 36px;
  gap: 8px;
  align-items: center;
}

.s1-bar-name {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-secondary);
  text-align: right;
}

.s1-bar-track {
  height: 12px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 2px;
  overflow: hidden;
}

.s1-bar-fill {
  height: 100%;
  width: 0;
  background: var(--ink-secondary);
  transition: width 220ms ease-out;
}

/* When the row carries a class-* class, the swatch/legend coloring is on
   the swatch elsewhere; for bars we override the fill background. */
.s1-bar-fill.class-sky    { background: var(--class-sky); }
.s1-bar-fill.class-grass  { background: var(--class-grass); }
.s1-bar-fill.class-sun    { background: var(--class-sun); }
.s1-bar-fill.class-tree   { background: var(--class-tree); }
.s1-bar-fill.class-person { background: var(--class-person); }

.s1-bar-fill-blank {
  background: repeating-linear-gradient(
    45deg,
    transparent 0 4px,
    var(--rule) 4px 6px
  );
  width: 100%;
  opacity: 0.5;
}

.s1-bar-val {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  text-align: right;
}

/* ---------------------------------------------------------------------------
   Verdict line under the classifier bars
   --------------------------------------------------------------------------- */

.s1-verdict {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 14px;
  color: var(--ink-secondary);
  text-align: center;
  margin-top: 4px;
  opacity: 0.55;
  transition: opacity 200ms ease-out;
}
.s1-verdict.s1-visible { opacity: 1; }
.s1-verdict strong { font-weight: 600; }

/* ---------------------------------------------------------------------------
   Hover inspector (right panel)
   --------------------------------------------------------------------------- */

.s1-hover-wrap {
  margin-top: 6px;
  border-top: 1px dashed var(--rule);
  padding-top: 10px;
  opacity: 0.45;
  transition: opacity 200ms ease-out;
}
.s1-hover-wrap.s1-hover-enabled { opacity: 1; }

.s1-hover-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.s1-hover-title {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 13px;
  color: var(--ink-secondary);
}

.s1-hover-pos {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--ink);
}

.s1-hover-bars { width: 240px; }

.s1-hover-argmax {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 13px;
  color: var(--ink-secondary);
}
.s1-hover-argmax strong { font-weight: 600; }

.s1-output-host.s1-hover-on canvas { cursor: crosshair; }

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

.s1-legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  padding: 6px 4px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.s1-legend-item {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-secondary);
}

.s1-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--ink-secondary);
}
.s1-swatch.class-sky    { background: var(--class-sky); }
.s1-swatch.class-grass  { background: var(--class-grass); }
.s1-swatch.class-sun    { background: var(--class-sun); }
.s1-swatch.class-tree   { background: var(--class-tree); }
.s1-swatch.class-person { background: var(--class-person); }

.s1-legend-name { color: var(--ink); }

/* ---------------------------------------------------------------------------
   Side-by-side KaTeX formula blocks (step 4)
   --------------------------------------------------------------------------- */

.s1-formulas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 4px;
  opacity: 0;
  transition: opacity 220ms ease-out;
  pointer-events: none;
}
.s1-formulas.s1-visible {
  opacity: 1;
  pointer-events: auto;
}

.s1-formula {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 14px 6px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}
.s1-formula-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
}
.s1-formula-math .katex-display { margin: 0; }
.s1-formula-math .katex { color: var(--ink); }

/* ---------------------------------------------------------------------------
   Caption / honest footnote
   --------------------------------------------------------------------------- */

.s1-caption { margin-top: 4px; }

.s1-honest {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 12.5px;
  color: var(--ink-secondary);
  border-left: 2px solid var(--rule);
  padding: 4px 10px;
  margin: 4px 0 0;
  font-style: italic;
}
.s1-honest strong {
  font-style: normal;
  color: var(--ink);
}
.s1-honest em { color: var(--ink); }

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

@media (max-width: 1100px) {
  .s1-panels { grid-template-columns: 1fr; }
  .s1-formulas { grid-template-columns: 1fr; }
  .s1-flow-row { flex-wrap: wrap; }
  .s1-bars { width: 100%; }
}