/* ── Fraction Calculator — tool-specific styles ──────────────────────────────
   Global styles are inherited from /css/style.css.
   Colours reference CSS custom properties only — no hardcoded values.
   ─────────────────────────────────────────────────────────────────────────── */

.frac-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card, 8px);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.frac-card__heading {
  font-size: 1.05rem;
  margin: 0;
}

.frac-help {
  margin: -0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.frac-operands {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.frac-operand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1 1 220px;
}

/* When .frac-operand is a direct child of the column-direction .frac-card
   (the standalone simplifier, not the paired add/subtract/multiply/divide
   row), flex-basis applies to the column's main axis (height) instead of
   width — reset it so the card doesn't stretch to 220px tall. */
.frac-card > .frac-operand {
  flex: 0 0 auto;
}

.frac-operand__label {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.frac-fraction-input {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.frac-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  width: 5rem;
}

.frac-field__label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.frac-whole-input,
.frac-num-input,
.frac-den-input {
  width: 5rem;
  text-align: center;
}

.frac-operator {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 0 0 auto;
}

.frac-op-btn {
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-control, 8px);
  background: var(--bg-secondary, var(--bg-card));
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.875rem;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.frac-op-btn:hover {
  border-color: var(--accent);
}

.frac-op-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--color-on-accent, #fff);
}

.frac-error {
  margin: 0;
  color: var(--color-danger, #c0392b);
  font-size: 0.875rem;
}

.frac-steps {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.frac-steps__label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.frac-steps__value {
  display: block;
  background: var(--bg-secondary, var(--bg-card));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-control, 8px);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  overflow-x: auto;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .frac-operands {
    flex-direction: column;
    align-items: stretch;
  }

  .frac-operator {
    flex-direction: row;
    flex-wrap: wrap;
  }
}