.limiting-layout {
  display: grid;
  gap: 28px;
  align-items: start;
}

@media (min-width: 1040px) {
  .limiting-layout {
    grid-template-columns: minmax(0, 60%) minmax(340px, 1fr);
  }
}

.limiting-card {
  background: var(--surface-0, #ffffff);
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 10px 28px -18px rgba(15, 23, 42, 0.3);
  border-radius: 16px;
}

.limiting-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
  padding: 6px;
  border-radius: 12px;
  background: var(--surface-50, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
}

.limiting-tab {
  appearance: none;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 999px;
  padding: 6px 14px;
  font-weight: 600;
  background: var(--surface-100, #f5f7fb);
  color: var(--text-muted, #54606f);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  min-width: 92px;
}

.limiting-tab[aria-selected='true'] {
  background: var(--accent-50, #eef2ff);
  color: var(--accent-900, #1d4ed8);
  border-color: var(--accent-200, #c7d2fe);
}

.limiting-tab:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 2px;
}

.limiting-panel {
  display: grid;
  gap: 16px;
  background: var(--surface-50, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 12px;
  padding: 16px;
}

.field-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .field-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-weight: 600;
  color: var(--text-muted, #475569);
}

.field input,
.field select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 8px;
  background: var(--surface-0, #ffffff);
  font: inherit;
  min-height: 40px;
}

.field input:focus-visible,
.field select:focus-visible {
  outline: 2px solid var(--accent-300, #a5b4fc);
  outline-offset: 1px;
}

.limiting-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: flex-start;
}

.button-ghost,
.button-primary {
  appearance: none;
  border-radius: 999px;
  padding: 8px 18px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  min-width: 160px;
}

.button-primary {
  border: none;
  background: linear-gradient(120deg, var(--accent-700, #1d4ed8), var(--accent-500, #3b82f6));
  color: #ffffff;
  box-shadow: 0 10px 18px -12px var(--accent-700, rgba(29, 78, 216, 0.8));
}

.button-ghost {
  border: 1px solid var(--border, #d0d7de);
  background: transparent;
  color: var(--text-main, #1f2933);
}

.button-primary:focus-visible,
.button-ghost:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 2px;
}

.button-primary:active,
.button-ghost:active {
  transform: scale(0.98);
}

.hint {
  font-size: 0.85rem;
  color: var(--text-muted, #64748b);
}

#reaction-error,
#yield-error,
#purity-error {
  color: var(--danger-700, #b91c1c);
  font-weight: 600;
  margin: 0;
}

.species-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 740px;
}

.species-table th,
.species-table td {
  padding: 10px;
  border-bottom: 1px dashed var(--border, #d0d7de);
  text-align: left;
  vertical-align: top;
}

.species-table tbody tr:last-child td {
  border-bottom: none;
}

.limiting-table {
  overflow-x: auto;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 12px;
  background: var(--surface-0, #ffffff);
}

.species-cards {
  display: grid;
  gap: 12px;
}

.species-card {
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 12px;
  padding: 12px;
  background: var(--surface-0, #ffffff);
  display: grid;
  gap: 8px;
}

.species-card header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
}

.species-badges {
  display: flex;
  gap: 6px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.8rem;
  background: var(--surface-100, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
}

.species-card .field-inline {
  display: grid;
  gap: 8px;
}

@media (min-width: 720px) {
  .species-cards {
    display: none;
  }
}

@media (max-width: 719px) {
  .limiting-table {
    display: none;
  }
}

.amount-wrapper {
  display: grid;
  gap: 8px;
}

.input-solution {
  display: grid;
  gap: 6px;
}

.steps-list {
  list-style: decimal;
  padding-inline-start: 20px;
  margin: 16px 0 0;
  display: grid;
  gap: 10px;
  font-variant-numeric: tabular-nums;
}

.step-item.warning {
  color: var(--accent-800, #1d4ed8);
  font-weight: 600;
}

.summary-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.summary-item {
  display: grid;
  gap: 2px;
}

.summary-item dt {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted, #475569);
}

.summary-item dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.result-card {
  display: grid;
  gap: 16px;
}

.share-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

#copy-status {
  font-size: 0.85rem;
  color: var(--accent-800, #1d4ed8);
}

.limiting-header {
  display: grid;
  gap: 12px;
  margin-bottom: 24px;
}

.limiting-header .lead {
  font-size: 1.05rem;
  color: var(--text-muted, #475569);
}

.limiting-warning {
  font-size: 0.9rem;
  color: var(--danger-600, #dc2626);
  margin: 4px 0;
}

.card-section {
  background: var(--surface-0, #ffffff);
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 20px;
  margin-top: 24px;
}

.faq-list details {
  border: 1px solid var(--border, #d0d7de);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 12px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 600;
}

.related-list {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.related-list a {
  color: var(--accent-700, #1d4ed8);
  font-weight: 600;
}

.result-card {
  position: relative;
}

@media (min-width: 1040px) {
  .result-card {
    position: sticky;
    top: 88px;
  }
}

.ad-slot {
  background: var(--surface-100, #f8fafc);
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: var(--text-muted, #94a3b8);
  min-height: 120px;
}

#comments button {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--border, #d0d7de);
  background: transparent;
  cursor: pointer;
  font-weight: 600;
}

#comments button:focus-visible {
  outline: 2px solid var(--accent-300, #a5b4fc);
  outline-offset: 2px;
}

.info-tip {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 18px;
  height: 18px;
  margin-left: 6px;
  border-radius: 50%;
  background: var(--accent-50, #eef2ff);
  color: var(--accent-800, #1d4ed8);
  font-size: 0.7rem;
  cursor: default;
}

.equation-preview {
  min-height: 22px;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted, #475569);
}

.suggestions {
  position: relative;
}

.suggestions .suggestion-list {
  position: absolute;
  z-index: 10;
  top: 2px;
  left: 0;
  right: 0;
  background: #ffffff;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 10px;
  box-shadow: 0 12px 30px -18px rgba(15, 23, 42, 0.35);
  overflow: hidden;
}

.suggestion-item {
  padding: 10px 12px;
  display: grid;
  gap: 2px;
  cursor: pointer;
}

.suggestion-item:hover,
.suggestion-item:focus {
  background: var(--surface-50, #f8fafc);
}

.suggestion-item strong {
  font-weight: 700;
}

.suggestion-meta {
  font-size: 0.9rem;
  color: var(--text-muted, #475569);
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.sigfig-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chart-card {
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 12px;
  padding: 12px;
  background: var(--surface-0, #ffffff);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.limiting-chart {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.chart-unit {
  font-size: 0.9rem;
  color: var(--text-muted, #475569);
}

.bar-row {
  display: grid;
  gap: 6px;
}

.bar-label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.9rem;
}

.bar-track {
  position: relative;
  height: 12px;
  background: var(--surface-100, #f8fafc);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border, #e2e8f0);
}

.bar-required {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--accent-50, #e0e7ff);
}

.bar-available {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(120deg, var(--accent-600, #2563eb), var(--accent-500, #3b82f6));
}

.bar-row.limiting .bar-available {
  background: linear-gradient(120deg, #fb7185, #ef4444);
}

.bar-meta {
  font-size: 0.85rem;
  color: var(--text-muted, #475569);
}

.dim-analysis-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
  font-family: ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: var(--surface-50, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 12px;
  padding: 12px;
}

.dim-step {
  display: grid;
  gap: 6px;
}

.dim-title {
  font-weight: 700;
  color: var(--text-main, #1f2933);
}

.fraction {
  display: inline-grid;
  grid-template-rows: auto auto;
  border-bottom: 1px solid currentColor;
  padding: 0 2px;
  line-height: 1.2;
}

.fraction .num {
  text-align: center;
}

.fraction .den {
  text-align: center;
  font-size: 0.9em;
}

.dim-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.dot {
  font-weight: 700;
}