/* Scale Factor Calculator — page-specific styles.
   Mobile-first; uses design-system custom properties. */

.input-unit-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
}

.input-unit-row input {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 44px;
  font-size: 16px; /* prevents iOS zoom-on-focus */
}

.input-unit-row select {
  flex: 0 0 5.5rem;
  min-height: 44px;
  font-size: 16px;
}

.panel-clear {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.35rem 0.5rem;
  min-width: 32px;
  min-height: 32px;
  border-radius: var(--radius-sm);
  flex: 0 0 auto;
}

.panel-clear:hover { color: var(--color-error); background: var(--color-border-light); }

/* Always-visible length / area / volume multiplier panel */
.av-panel {
  margin-top: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.av-panel .av-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 0.9rem;
}

.av-panel .av-row:last-child { border-bottom: none; }

.av-panel .av-row .av-label { color: var(--color-text-light); }

.av-panel .av-row .av-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-text);
}

.av-panel .av-row:first-child .av-value { color: var(--color-primary); }

.scale-name-note {
  margin-top: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  background: var(--color-bg);
  border: 1px solid var(--color-orange-100);
  color: var(--color-text);
  font-size: 0.9rem;
}

.flip-note {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-style: italic;
}

.sf-error {
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  font-size: 0.85rem;
}

/* Canvas visual comparison */
.sf-visual-section { margin-top: 1.5rem; }

#sf-visual {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  padding: 0.5rem;
  text-align: center;
  overflow: hidden;
}

#sf-canvas { max-width: 100%; height: auto; }

#sf-visual-caption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  min-height: 1.2em;
  margin: 0.25rem 0 0;
}

/* Triple factor output row (decimal / ratio / percent) */
.factor-triple {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

@media (min-width: 640px) {
  .factor-triple { grid-template-columns: repeat(3, 1fr); }
}

.factor-cell {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0.75rem;
  text-align: center;
}

.factor-cell .factor-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

.factor-cell .factor-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  word-break: break-all;
}

/* Static teaching diagrams */
.sf-diagram {
  margin: 1.25rem auto;
  text-align: center;
}

.sf-diagram svg {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  background: var(--color-white);
}

.sf-diagram figcaption {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 0.5rem;
}