.frac-board {
  margin: 1rem auto 1.25rem;
  max-width: 28rem;
  text-align: center;
}

.frac-orig {
  font-size: 1.05rem;
  opacity: 0.85;
  min-height: 1.4em;
}

.frac-display {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  margin: 0.75rem 0 0.35rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.15;
}

.frac-bar {
  display: block;
  width: 100%;
  min-width: 2.5rem;
  height: 3px;
  margin: 0.2rem 0;
  background: currentColor;
  border-radius: 1px;
}

.frac-prompt {
  margin-top: 1rem;
  font-size: 1.1rem;
}

.frac-history {
  margin: 1rem auto 0;
  max-width: 28rem;
  text-align: left;
}

.frac-history[hidden] {
  display: none !important;
}

.frac-history-item {
  margin: 0.45rem 0;
  padding: 0.45rem 0.65rem;
  background: #f4f7fa;
  border: 1px solid #d7e2ea;
  border-radius: 0.35rem;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.frac-result-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.55rem;
  margin-bottom: 0.75rem;
}

.frac-result-row[hidden],
.approx-input-row[hidden] {
  display: none !important;
}

.frac-result-row .approx-answer-input {
  width: 5.5rem;
}

.frac-result-slash {
  font-size: 1.4rem;
  font-weight: 700;
}

.frac-pie-wrap {
  margin: 0.85rem auto 0;
  max-width: 14rem;
}

.frac-pie-wrap[hidden] {
  display: none !important;
}

.frac-pie {
  width: min(100%, 12rem);
  margin: 0 auto;
  aspect-ratio: 1;
}

.frac-pie svg {
  display: block;
  width: 100%;
  height: auto;
}

.frac-pie-slice--on {
  fill: #2a6f97;
  stroke: #fff;
  stroke-width: 0.4;
}

.frac-pie-slice--off {
  fill: #e4ebf1;
  stroke: #fff;
  stroke-width: 0.4;
}

.frac-pie-sector--on {
  fill: #2a6f97;
}

.frac-pie-sector--off {
  fill: #e4ebf1;
}

.frac-pie-ring {
  fill: none;
  stroke: #9eb6c8;
  stroke-width: 1.2;
}

.frac-pie-caption {
  margin: 0.45rem 0 0;
  font-size: 0.95rem;
  opacity: 0.85;
}