.iq-viz {
  padding: 0.8rem;
  border: 1px solid var(--rule);
  background: var(--bg-elev);
}

.iq-chart svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.iq-chart text {
  fill: var(--text-muted);
  font: 10px var(--font-mono);
}

.iq-chart .axis {
  stroke: var(--text-faint);
  stroke-width: 1;
}

.iq-chart .grid {
  stroke: var(--rule);
  stroke-width: 1;
}

.iq-chart .accent {
  stroke: var(--accent);
  fill: var(--accent);
}

.iq-chart .muted {
  stroke: var(--text-muted);
  fill: var(--text-muted);
}

.iq-chart polyline.accent,
.iq-chart polyline.muted {
  fill: none;
}

.iq-chart .iq-band {
  fill: var(--accent);
  stroke: none;
  opacity: 0.16;
}

.iq-chart .formula-break {
  stroke: var(--accent-dim);
  stroke-dasharray: 3 4;
}

.iq-term {
  padding: 0;
  border: 0;
  border-bottom: 1px dotted var(--accent);
  background: none;
  color: var(--accent);
  font: inherit;
  cursor: help;
}

.iq-popover {
  display: block;
  margin: -0.5rem 0 1.5rem;
  padding: 0.75rem;
  border-left: 2px solid var(--accent);
  background: var(--bg-elev);
}

.iq-popover[hidden] {
  display: none;
}

.iq-popover svg {
  display: block;
  width: 100%;
  height: auto;
}

.iq-popover text {
  fill: var(--text-muted);
  font: 10px var(--font-mono);
}

.iq-popover .axis {
  stroke: var(--text-faint);
  stroke-width: 1;
}

.iq-popover .accent {
  fill: none;
  stroke: var(--accent);
}

.iq-popover .normal-band {
  fill: var(--accent);
  stroke: none;
}

.iq-worked-example {
  margin: 1.75rem 0;
  padding: 1rem 1.2rem;
  border-left: 2px solid var(--accent);
  background: var(--bg-elev);
}

.iq-worked-example p:last-child {
  margin-bottom: 0;
}

.iq-equation {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.7rem;
  overflow-x: auto;
  margin: -0.15rem -0.25rem 1rem;
  padding: 0.45rem 0.25rem 1rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  white-space: nowrap;
}

.iq-equation span,
.iq-equation strong {
  text-align: center;
}

.iq-equation strong {
  color: var(--accent);
  font-size: 1.3rem;
}

.iq-equation small {
  display: block;
  margin-top: 0.3rem;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 400;
}

.iq-calculator {
  display: grid;
  gap: 0.8rem;
  margin: 1.75rem 0;
  padding: 1rem;
  border: 1px solid var(--rule);
  background: var(--bg-elev);
}

.iq-calculator fieldset,
.iq-curve-controls fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.iq-calculator legend,
.iq-curve-controls legend {
  margin-bottom: 0.25rem;
  color: var(--text-muted);
  font: 0.72rem var(--font-mono);
}

.iq-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem 1rem;
}

.iq-fields label {
  display: grid;
  gap: 0.25rem;
  color: var(--text-muted);
  font: 0.78rem var(--font-mono);
}

.iq-fields input {
  width: 100%;
  padding: 0.55rem;
  border: 1px solid var(--text-faint);
  border-radius: 2px;
  background: var(--bg);
  color: var(--text);
  font: 0.95rem var(--font-mono);
}

.math-pr-field.unavailable {
  opacity: 0.4;
}

.iq-result {
  display: grid;
  justify-items: center;
  gap: 0.15rem;
  margin-top: 0.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  text-align: center;
}

.iq-result strong {
  color: var(--accent);
  font: 2.4rem var(--font-serif);
}

.iq-result span {
  color: var(--text-muted);
  font: 0.9rem var(--font-mono);
}

.iq-curve-controls {
  display: grid;
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}

.iq-switch,
.iq-year-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.iq-switch input,
.iq-year-switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.iq-switch span,
.iq-year-switch span {
  display: block;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--text-faint);
  color: var(--text-muted);
  font: 0.76rem var(--font-mono);
  cursor: pointer;
}

.iq-switch input:checked + span,
.iq-year-switch input:checked + span {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.iq-switch input:focus-visible + span,
.iq-year-switch input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 520px) {
  .iq-fields {
    grid-template-columns: 1fr;
  }

  .iq-viz {
    margin-inline: -0.5rem;
    padding: 0.4rem;
  }
}