/* Scene 3 -- "Inside the high-D landscape"
   Style only. All colours come from the editorial palette tokens defined
   in css/style.css. No transitions on color/opacity/position (headless
   screenshot compatibility). Mirrors scene1's idiom for visual continuity. */

.s3-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.s3-hero {
  margin-bottom: 4px;
}

/* Two-column grid for landscape + fit panes. Falls back to single column
   on narrower viewports so neither pane gets cramped. */
.s3-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: stretch;
}

@media (max-width: 880px) {
  .s3-grid { grid-template-columns: 1fr; }
}

.s3-pane {
  display: flex;
  flex-direction: column;
  padding: 12px 14px 10px;
}

.s3-svg {
  width: 100%;
  height: auto;
  display: block;
  cursor: default;
}

/* Crosshair only on the loss-landscape pane to invite the (α, β, L) hover
   readout. */
.s3-pane:first-of-type .s3-svg {
  cursor: crosshair;
}

.s3-pane-bg {
  fill: var(--card-bg);
  stroke: none;
}

.s3-plot-frame {
  fill: none;
  stroke: var(--rule);
  stroke-width: 1;
}

/* ---- Landscape pane ---------------------------------------------------- */

.s3-contour {
  fill: none;
  stroke: var(--contour);
  stroke-width: 0.7;
}

.s3-contour-hi {
  stroke: var(--contour-hi);
  stroke-width: 1;
}

.s3-axis {
  stroke: var(--axis);
  stroke-width: 1;
  fill: none;
}

.s3-tick {
  stroke: var(--axis);
  stroke-width: 1;
}

.s3-tick-label {
  fill: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

.s3-axis-label {
  fill: var(--ink-secondary);
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 12px;
}

.s3-optimum-mark {
  stroke: var(--ink);
  stroke-width: 1.4;
  fill: none;
}

.s3-init-ring {
  fill: none;
  stroke: var(--ink-secondary);
  stroke-width: 1.4;
}

/* Alternative-minima markers: Adam (the cross at origin) is .s3-optimum-mark.
   SGD- and Momentum-minima get a smaller "x" cross in the descent-trail
   colour to read clearly against the contour fills. */
.s3-altmin-mark {
  stroke: var(--trajectory);
  stroke-width: 1.6;
  stroke-linecap: round;
}

.s3-marker-label {
  fill: var(--ink-secondary);
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-style: italic;
  font-size: 11px;
}

.s3-trajectory {
  fill: none;
  stroke: var(--trajectory);
  stroke-width: 1.4;
  stroke-dasharray: 4 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.s3-marble {
  fill: var(--marble);
  stroke: var(--card-bg);
  stroke-width: 1.2;
}

/* Hover readout (mirrors scene 1) */
.s3-hover.hidden {
  visibility: hidden;
}
.s3-hover-bg {
  fill: var(--card-bg);
  stroke: var(--rule);
  stroke-width: 1;
  fill-opacity: 0.94;
}
.s3-hover-text {
  fill: var(--ink);
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

/* ---- Fit pane (right) -------------------------------------------------- */

.s3-truth {
  fill: none;
  stroke: var(--truth);
  stroke-width: 1.4;
  stroke-dasharray: 4 4;
}

.s3-data-pt {
  fill: var(--data);
  fill-opacity: 0.55;
  stroke: none;
}

.s3-fit-curve {
  fill: none;
  stroke: var(--fit);
  stroke-width: 2.4;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* ---- Captions, controls, optimizer-info, math ------------------------- */

.s3-caption {
  margin-top: 6px;
  margin-bottom: 0;
}

.s3-controls {
  margin-top: 14px;
}

.s3-controls input[type="range"] {
  width: 110px;
}

.s3-seed-input {
  width: 64px;
  background: var(--card-bg);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 3px 6px;
  font: inherit;
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
  text-align: right;
}

.s3-opt-info {
  margin-top: 10px;
}

/* Math caption block (KaTeX) */
.s3-math {
  margin: 10px 4px 0;
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 14px 12px;
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 13.5px;
  color: var(--ink);
  line-height: 1.55;
}

.s3-math .katex {
  font-style: normal;
  color: var(--ink);
}

.s3-eq {
  display: flex;
  justify-content: center;
  margin: 4px 0 8px;
}

.s3-eq .katex-display {
  margin: 2px 0;
}

.s3-where {
  display: block;
  font-style: italic;
  color: var(--ink-secondary);
  font-size: 12.5px;
  line-height: 1.7;
  margin: 4px 0 0;
}

.s3-where-lab {
  font-style: italic;
  color: var(--ink-secondary);
  margin-right: 8px;
}

.s3-var {
  font-style: normal;
  display: inline;
  color: var(--ink);
}

.s3-defn {
  font-style: italic;
  color: var(--ink-secondary);
}

.s3-sep {
  color: var(--ink-secondary);
}

.s3-status {
  margin-top: 8px;
}