.vis-panel {
  background: var(--paper);
  border: 1px solid var(--border);
  padding: 16px;
  margin-top: 12px;
}
.vis-svg {
  width: 100%;
  max-width: 520px;
  display: block;
}
.vis-modes { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.balance {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
}
.gcd-panel {
  border-left: 3px solid var(--secondary);
  padding-left: 12px;
}
.reciprocal-strip {
  background: var(--highlight);
  padding: 10px 12px;
  font-family: var(--mono);
}
.place-value {
  display: flex;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}