:root {
  --diff-primary: #0284c7;
  --diff-primary-hover: #0369a1;
  --diff-bg-card: #ffffff;
  --diff-border: #e2e8f0;
  --diff-text-main: #0f172a;
  --diff-text-muted: #64748b;
  --diff-pill-bg: #f1f5f9;
  --diff-pill-hover: #e2e8f0;
  --diff-result-bg: #f8fafc;
  --diff-add-bg: #dcfce7;
  --diff-add-text: #166534;
  --diff-del-bg: #fee2e2;
  --diff-del-text: #991b1b;
}

.diff-tool-container {
  max-width: 920px;
  margin: 0 auto 3rem auto;
  font-family: inherit;
  color: var(--diff-text-main);
}

.diff-card {
  background: var(--diff-bg-card);
  border: 1px solid var(--diff-border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.diff-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--diff-border);
}

.diff-controls-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.diff-field-sm {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.diff-field-sm label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--diff-text-main);
}

.diff-field-sm select {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--diff-border);
  border-radius: 6px;
  background: var(--diff-bg-card);
  color: var(--diff-text-main);
  font-size: 0.85rem;
}

.diff-options-checks {
  display: flex;
  gap: 1rem;
}

.diff-check-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.825rem;
  cursor: pointer;
  color: var(--diff-text-main);
}

.diff-presets-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.diff-presets-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--diff-text-muted);
}

.diff-pill-btn {
  background: var(--diff-pill-bg);
  border: 1px solid var(--diff-border);
  color: var(--diff-text-main);
  border-radius: 9999px;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.diff-pill-btn:hover {
  background: var(--diff-pill-hover);
  border-color: var(--diff-primary);
}

.diff-input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 700px) {
  .diff-input-grid {
    grid-template-columns: 1fr;
  }
}

.diff-input-pane {
  display: flex;
  flex-direction: column;
}

.diff-pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.diff-pane-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--diff-text-main);
}

.diff-stat-sm {
  font-size: 0.75rem;
  color: var(--diff-text-muted);
}

.diff-input-pane textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--diff-border);
  border-radius: 8px;
  background: var(--diff-bg-card);
  color: var(--diff-text-main);
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  box-sizing: border-box;
}

.diff-input-pane textarea:focus {
  outline: none;
  border-color: var(--diff-primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.diff-action-row {
  display: flex;
  gap: 0.75rem;
}

.diff-primary-btn {
  flex: 2;
  background: var(--diff-primary);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
}

.diff-primary-btn:hover {
  background: var(--diff-primary-hover);
}

.diff-secondary-btn,
.diff-tertiary-btn {
  background: var(--diff-pill-bg);
  color: var(--diff-text-main);
  border: 1px solid var(--diff-border);
  border-radius: 8px;
  padding: 0.85rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.diff-secondary-btn:hover,
.diff-tertiary-btn:hover {
  background: var(--diff-pill-hover);
}

.diff-results-card {
  background: var(--diff-result-bg);
  border: 1px solid var(--diff-border);
  border-radius: 12px;
  padding: 1.75rem;
}

.diff-metrics-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .diff-metrics-bar {
    grid-template-columns: 1fr 1fr;
  }
}

.diff-metric-pill {
  background: var(--diff-bg-card);
  border: 1px solid var(--diff-border);
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.diff-metric-label {
  display: block;
  font-size: 0.75rem;
  color: var(--diff-text-muted);
  margin-bottom: 0.25rem;
}

.diff-metric-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--diff-text-main);
}

.diff-metric-add .diff-metric-val { color: var(--diff-add-text); }
.diff-metric-del .diff-metric-val { color: var(--diff-del-text); }

.diff-view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.diff-view-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--diff-text-main);
}

.diff-legend {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.diff-legend-del { color: var(--diff-del-text); }
.diff-legend-add { color: var(--diff-add-text); }

.diff-render-box {
  background: var(--diff-bg-card);
  border: 1px solid var(--diff-border);
  border-radius: 8px;
  padding: 1.25rem;
  font-size: 1rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 120px;
}

.diff-render-box ins {
  background: var(--diff-add-bg);
  color: var(--diff-add-text);
  text-decoration: none;
  font-weight: 600;
  border-radius: 3px;
  padding: 0.1rem 0.25rem;
}

.diff-render-box del {
  background: var(--diff-del-bg);
  color: var(--diff-del-text);
  text-decoration: line-through;
  border-radius: 3px;
  padding: 0.1rem 0.25rem;
}

.diff-metric-sim .diff-metric-val { color: var(--diff-primary); }
.diff-metric-total .diff-metric-val { color: var(--diff-text-main); }

.diff-ad {
  overflow: hidden;
  min-height: 280px;
}
/* tf:dark-palette — generated by migrate_chrome.py */
/* Neutrals inherit the shared chrome tokens so all tools share one
   ground; brand hues are kept and lightened, never inverted. */
[data-theme="dark"] {
  --diff-primary: #81bcda;
  --diff-primary-hover: #69aed4;
  --diff-bg-card: var(--tf-surface);
  --diff-border: var(--tf-surface);
  --diff-text-main: var(--tf-ink);
  --diff-text-muted: var(--tf-ink-faint);
  --diff-pill-bg: var(--tf-surface);
  --diff-pill-hover: var(--tf-surface);
  --diff-result-bg: var(--tf-surface);
  --diff-add-bg: var(--tf-surface);
  --diff-add-text: #59cf86;
  --diff-del-bg: var(--tf-surface);
  --diff-del-text: #d77676;
}