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

.arc-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.arc-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: 1.1rem;
  margin-bottom: 1.25rem;
}

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

.arc-fields {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: 0.75rem;
}

@media (max-width: 520px) {
  .arc-fields {
    grid-template-columns: 1fr;
  }
}

.arc-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

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

.arc-input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-control, 8px);
  background: var(--bg-input, var(--bg-card));
  color: var(--text-primary);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.arc-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.arc-swap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-control, 8px);
  background: var(--bg-secondary, var(--bg-card));
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.arc-swap:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (max-width: 520px) {
  .arc-swap {
    justify-self: center;
  }
}

.arc-presets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.arc-chips {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.arc-chip {
  padding: 5px 12px;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: var(--bg-secondary, var(--bg-card));
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.arc-chip:hover {
  border-color: var(--accent);
}

.arc-chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--color-on-accent, #fff);
}

.arc-readouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 520px) {
  .arc-readouts {
    grid-template-columns: 1fr;
  }
}

.arc-readout {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-control, 8px);
  background: var(--bg-secondary, var(--bg-card));
}

.arc-readout__label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.arc-readout__value {
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
}

.arc-input-copy {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.arc-copy-btn,
.arc-reset-btn {
  padding: 0.5rem 0.85rem;
  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: 0.85rem;
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s;
}

.arc-copy-btn:hover,
.arc-reset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.arc-reset-btn {
  align-self: flex-start;
}

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