.empirical-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--border, #d0d7de);
  padding-bottom: 8px;
  margin-bottom: 16px;
}

.empirical-tab {
  appearance: none;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 8px;
  background: var(--surface-100, #f5f7fb);
  padding: 6px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.empirical-tab[aria-selected='true'] {
  background: var(--surface-0, #fff);
  color: var(--accent-900, #1e3a8a);
  border-color: var(--accent-200, #c7d2fe);
}

.empirical-tab:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 1px;
}

.empirical-panel {
  display: grid;
  gap: 16px;
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
}

.comp-table th,
.comp-table td {
  border-bottom: 1px dashed var(--border, #d0d7de);
  padding: 8px;
  text-align: left;
  font-size: 0.95rem;
}

.comp-table input,
.comp-table select {
  width: 100%;
}

.button-small {
  padding: 6px 10px;
  min-width: 0;
  font-size: 0.85rem;
}

.empirical-form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.empirical-settings {
  display: grid;
  gap: 12px;
}

.empirical-form-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.empirical-settings label {
  display: grid;
  gap: 6px;
  font-size: 0.95rem;
}

.empirical-settings textarea {
  resize: vertical;
  min-height: 72px;
}

.empirical-settings .hint {
  font-size: 0.82rem;
  color: var(--text-muted, #6b7280);
}

.result-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 1100px) {
  .result-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.result-summary-list {
  display: grid;
  gap: 6px;
  margin: 0;
}

.result-summary-list dt {
  font-weight: 600;
  color: var(--text-muted, #6b7280);
}

.result-summary-list dd {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-variant-numeric: tabular-nums;
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 0.95rem;
}

.result-table th,
.result-table td {
  border: 1px solid var(--border, #d0d7de);
  padding: 6px 10px;
  vertical-align: top;
}

.result-steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  font-variant-numeric: tabular-nums;
}

.empirical-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.result-feedback {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--accent-800, #1d4ed8);
}

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