/* gradient-descent.css */

/* --- Controls bar --- */
.ui.gradient-descent .gd-controls {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 20px 32px;
  margin-bottom: 20px;
}
/* The tab-specific row mixes a single select with a taller checkbox group, so its
   labels are top-aligned rather than bottom-aligned like the fixed row below it
   (whose button group relies on flex-end to sit level with the sliders). */
.ui.gradient-descent .gd-controls-top { align-items: flex-start; }
.ui.gradient-descent .gd-control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 160px;
}
.ui.gradient-descent .gd-control-group[hidden] { display: none; }
.ui.gradient-descent .gd-label {
  font: 600 10px/1 var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.ui.gradient-descent .gd-select {
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  font: 500 13px/1 var(--font-sans);
  padding: 7px 10px;
  cursor: pointer;
}
.ui.gradient-descent .gd-slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.ui.gradient-descent .gd-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 140px;
  height: 3px;
  border-radius: 2px;
  background: var(--hairline-strong);
  cursor: pointer;
}
.ui.gradient-descent .gd-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
.ui.gradient-descent .gd-slider::-moz-range-thumb {
  width: 14px; height: 14px;
  border: 0; border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
.ui.gradient-descent .gd-output {
  font: 500 12px/1 var(--font-mono);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
}
.ui.gradient-descent .gd-btn-group {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}
.ui.gradient-descent .gd-btn {
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font: 600 12px/1 var(--font-sans);
  cursor: pointer;
  border: 1px solid var(--hairline);
  background: var(--surface-2);
  color: var(--text-2);
  transition: background 0.15s, color 0.15s;
}
.ui.gradient-descent .gd-btn:hover { background: var(--surface-3); color: var(--text-1); }
.ui.gradient-descent .gd-btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.ui.gradient-descent .gd-btn-primary:hover { opacity: 0.88; }
.ui.gradient-descent .gd-btn-primary.is-running { background: #c0392b; border-color: #c0392b; }
.ui.gradient-descent .gd-mode-tabs { margin-bottom: 16px; }
.ui.gradient-descent .gd-checkbox-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
}
.ui.gradient-descent .gd-checkbox-row .control-row { gap: 7px; }

/* --- Viz row --- */
/* Definite height on surface wrap — min-height alone is not a definite height so
   canvas { height: 100% } would collapse circularly. See pca.css for the same fix. */
.ui.gradient-descent .gd-viz-row {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
  align-items: stretch;
}
.ui.gradient-descent .gd-surface-wrap {
  position: relative;
  height: 420px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #080810;
}
.ui.gradient-descent .gd-surface-wrap canvas { touch-action: none; }
.ui.gradient-descent .gd-right-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 420px;
}
.ui.gradient-descent .gd-contour-wrap {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #080810;
  flex: 1;
  min-height: 0;
  cursor: crosshair;
}
.ui.gradient-descent .gd-contour-wrap svg {
  display: block;
  width: 100%;
  height: 100%;
}
.ui.gradient-descent .gd-contour-hint {
  margin: 0;
  font: 500 11px/1.3 var(--font-sans);
  color: var(--text-muted);
}

/* --- Legend --- */
.ui.gradient-descent .gd-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: var(--surface-1);
}
.ui.gradient-descent .gd-legend-summary {
  font: 600 10px/1.3 var(--font-mono);
  letter-spacing: .04em;
  color: var(--text-muted);
  padding-bottom: 8px;
  margin-bottom: 2px;
  border-bottom: 1px solid var(--hairline);
}
.ui.gradient-descent .gd-legend-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 4px;
  margin: -3px -4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s;
}
.ui.gradient-descent .gd-legend-row:hover { background: var(--surface-2); }
.ui.gradient-descent .gd-legend-row:focus-visible { outline: var(--focus-ring); outline-offset: 1px; }
.ui.gradient-descent .gd-legend-row.is-dimmed { opacity: 0.4; }
.ui.gradient-descent .gd-legend-row.is-dimmed:hover { opacity: 0.7; }
.ui.gradient-descent .gd-legend-row.is-highlighted { background: var(--surface-2); }
.ui.gradient-descent .gd-legend-row.is-highlighted .gd-legend-name { color: var(--accent-link, var(--text-1)); }
.ui.gradient-descent .gd-legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex: none;
}
.ui.gradient-descent .gd-legend-name {
  font: 600 12px/1 var(--font-mono);
  color: var(--text-1);
  min-width: 72px;
}
.ui.gradient-descent .gd-legend-stats {
  font: 500 11px/1.3 var(--font-mono);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  margin-left: auto;
  text-align: right;
}

/* --- Body sections --- */
.ui.gradient-descent .article-body h3 {
  font: 600 15px/1.3 var(--font-sans);
  color: var(--text-1);
  margin: 28px 0 8px;
}
.ui.gradient-descent .article-body h3:first-child { margin-top: 0; }

/* --- Responsive --- */
@media (max-width: 820px) {
  .ui.gradient-descent .gd-viz-row { grid-template-columns: 1fr; }
  .ui.gradient-descent .gd-right-col { height: auto; }
  .ui.gradient-descent .gd-contour-wrap { min-height: 200px; }
}