/* Diffraction lab — Fraunhofer grating. */

.diff {
  margin: 0 0 2rem;
}

.diff-board {
  min-width: 0;
}
.diff-board canvas {
  width: 100%;
  height: 480px;
  display: block;
}

/* controls */
.diff-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.diff-controls .ctrl-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.diff-controls .ctrl-row.sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1.5rem;
}
.diff-controls .row-control {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.diff-controls .row-control .label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: lowercase;
  letter-spacing: 0.04em;
}
.diff-controls .row-control .value {
  color: var(--ink-soft);
  font-feature-settings: "tnum" 1;
  text-transform: none;
}

.diff-controls input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 14px;
  background: transparent;
  cursor: pointer;
  margin: 0;
}
.diff-controls input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--rule);
}
.diff-controls input[type="range"]::-moz-range-track {
  height: 1px;
  background: var(--rule);
}
.diff-controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-warm);
  margin-top: -6px;
  border: none;
  transition: transform 0.15s ease;
}
.diff-controls input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-warm);
  border: none;
}
.diff-controls input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.25);
}

.diff-controls button {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.4rem 0.95rem;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.diff-controls button:hover {
  color: var(--accent-warm);
  border-color: var(--accent-warm);
}
.diff-controls button#mode.is-white {
  color: var(--accent-warm);
  border-color: var(--accent-warm);
}

/* notes em chips (same idiom as collisions) */
.notes em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.85em;
  padding: 0.05em 0.4em;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--ink);
  margin: 0 0.1em;
}