/* Math explainer styles — progressive disclosure under chart panels */

.math-explainer {
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.math-explainer details {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xs);
}

.math-explainer summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  padding: var(--space-xs) 0;
  user-select: none;
}

.math-explainer summary:hover {
  opacity: 0.8;
}

.math-explainer .explainer-text {
  color: var(--color-text-muted, #555);
  margin: var(--space-xs) 0 var(--space-sm);
}

/* Equation block */
.eq-block {
  margin: var(--space-xs) 0;
}

.eq-label {
  font-weight: 600;
  color: var(--color-text);
  margin-right: var(--space-xs);
}

.eq {
  font-family: "Georgia", "Times New Roman", serif;
  font-size: 1.05em;
  white-space: nowrap;
  overflow-x: auto;
  display: inline-block;
  max-width: 100%;
}

.eq-var {
  font-style: italic;
}

/* Fraction layout */
.eq-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  margin: 0 0.15em;
  font-size: 0.85em;
  line-height: 1.2;
}

.eq-frac .eq-num {
  border-bottom: 1px solid currentColor;
  padding: 0 0.2em 1px;
}

.eq-frac .eq-den {
  padding: 1px 0.2em 0;
}

/* Subscript */
.eq-sub {
  font-size: 0.75em;
  vertical-align: sub;
}

/* Variable tags */
.explainer-vars {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.var-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: monospace;
}

/* Horizontal scroll for wide equations on mobile */
@media (max-width: 639px) {
  .eq {
    display: block;
    overflow-x: auto;
    padding-bottom: 2px;
  }
}