:root {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-bg: #f1f5f9;
  --secondary-text: #334155;
  --muted-color: #64748b;
  --success-color: #16a34a;
  --error-color: #dc2626;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --warning-color: #d97706;
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

html[data-theme="dark"] {
  --bg-color: #0c111b;
  --text-color: #e8edf6;
  --card-bg: #141c2e;
  --card-border: #212d45;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-bg: #1e293b;
  --secondary-text: #cbd5e1;
  --muted-color: #94a3b8;
  --success-color: #22c55e;
  --error-color: #ef4444;
  --error-bg: #2d161a;
  --error-border: #4a1d24;
  --warning-color: #f59e0b;
}

html[data-theme="dark"] body {
  background-color: #0c111b !important;
  color: #e8edf6 !important;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  padding: 1rem;
  min-height: 100vh;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--card-border);
}

.app-brand strong {
  display: block;
  font-size: 1.25rem;
}

.app-brand small {
  color: var(--muted-color);
  font-size: 0.875rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.local-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  background-color: var(--secondary-bg);
  color: var(--secondary-text);
}

.workspace {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.mode-switch {
  display: flex;
  background-color: var(--secondary-bg);
  padding: 0.25rem;
  border-radius: 0.5rem;
  gap: 0.25rem;
}

.mode-switch button {
  border: none;
  background: transparent;
  color: var(--secondary-text);
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.mode-switch button.active {
  background-color: var(--card-bg);
  color: var(--text-color);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 0.375rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}

.button.primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

.button.primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.button.secondary {
  background-color: var(--secondary-bg);
  color: var(--secondary-text);
  border-color: var(--card-border);
}

.button.quiet {
  background: transparent;
  color: var(--secondary-text);
}

.button.quiet:hover:not(:disabled) {
  background-color: var(--secondary-bg);
}

.button.small {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.options-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  padding: 1rem;
}

.options-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

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

.option-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.option-group label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--secondary-text);
}

.option-group select {
  padding: 0.375rem 0.625rem;
  border-radius: 0.375rem;
  border: 1px solid var(--card-border);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 0.875rem;
}

.checkbox-group {
  justify-content: flex-end;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.8125rem !important;
}

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 840px) {
  .editor-grid {
    grid-template-columns: 1fr;
  }
}

.editor-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-heading label {
  font-weight: 600;
  font-size: 0.9375rem;
}

.step {
  display: inline-block;
  background-color: var(--secondary-bg);
  color: var(--primary-color);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  margin-right: 0.375rem;
}

.text-button {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: 0.8125rem;
  cursor: pointer;
  text-decoration: underline;
}

textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.84rem;
  padding: 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid var(--card-border);
  background-color: var(--bg-color);
  color: var(--text-color);
  resize: vertical;
}

textarea:focus,
textarea:focus-visible,
select:focus,
select:focus-visible,
button:focus-visible {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: var(--focus-ring);
}

.editor-status {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--muted-color);
}

.samples-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sample-item {
  border: 1px solid var(--card-border);
  border-radius: 0.375rem;
  padding: 0.5rem;
  background-color: var(--bg-color);
}

.sample-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
}

.error-message {
  padding: 0.75rem;
  border-radius: 0.375rem;
  background-color: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-color);
  font-size: 0.875rem;
}

.diagnostics-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
}

.metrics-row article {
  background-color: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: 0.375rem;
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
}

.metrics-row span {
  font-size: 0.75rem;
  color: var(--muted-color);
}

.metrics-row strong {
  font-size: 1.125rem;
  color: var(--text-color);
}

.validation-status-box,
.warnings-box {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  font-size: 0.875rem;
}

.sample-validation-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sample-val-pill {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
}

.sample-val-pill.pass {
  background-color: rgba(22, 163, 74, 0.15);
  color: var(--success-color);
}

.sample-val-pill.fail {
  background-color: rgba(220, 38, 38, 0.15);
  color: var(--error-color);
}

.warnings-list {
  list-style-type: disc;
  padding-left: 1.25rem;
  color: var(--warning-color);
}

.warnings-list li {
  margin-bottom: 0.25rem;
}

.badge-neutral {
  background-color: var(--secondary-bg);
  color: var(--secondary-text);
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-success {
  background-color: rgba(22, 163, 74, 0.15);
  color: var(--success-color);
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.privacy-strip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--muted-color);
  padding: 0.5rem 0;
}

.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background-color: #0f172a;
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translateY(1rem);
  transition: all 0.2s ease-in-out;
  pointer-events: none;
  z-index: 1000;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Guided Mode Highlight */
.dth-guide-highlight {
  outline: 2px solid var(--primary-color) !important;
  outline-offset: 2px !important;
}