:root {
  --itbc-bg-card: #ffffff;
  --itbc-border: #e2e8f0;
  --itbc-text: #1e293b;
  --itbc-muted: #64748b;
  --itbc-primary: #6366f1;
  --itbc-primary-hover: #4f46e5;
  --itbc-primary-fg: #ffffff;
  --itbc-btn-bg: #f8fafc;
  --itbc-btn-border: #cbd5e1;
  --itbc-btn-hover: #e2e8f0;
  --itbc-stat-bg: #f8fafc;
  --itbc-badge-bg: #ede9fe;
  --itbc-badge-text: #6d28d9;
  --itbc-feedback-bg: #e0e7ff;
  --itbc-feedback-text: #3730a3;
}

.itbc-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

.itbc-card {
  background: var(--itbc-bg-card);
  border: 1px solid var(--itbc-border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.itbc-hero {
  text-align: center;
  margin-bottom: 1.5rem;
}

.itbc-hero-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--itbc-text);
  margin: 0 0 0.5rem 0;
}

.itbc-hero-subtitle {
  font-size: 0.875rem;
  color: var(--itbc-muted);
  margin: 0;
}

.itbc-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.itbc-char-card {
  background: var(--itbc-stat-bg);
  border: 1px solid var(--itbc-border);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.itbc-char-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  background-color: var(--itbc-badge-bg);
  color: var(--itbc-badge-text);
}

.itbc-char-code {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.75rem;
  color: var(--itbc-muted);
}

.itbc-char-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--itbc-text);
  margin: 0 0 0.5rem 0;
}

.itbc-char-desc {
  font-size: 0.8125rem;
  color: var(--itbc-muted);
  line-height: 1.4;
  margin: 0 0 1rem 0;
  flex-grow: 1;
}

.itbc-btn {
  width: 100%;
  padding: 0.6rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s ease;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.itbc-copy-char-btn {
  cursor: pointer;
}

.itbc-btn-primary {
  background: var(--itbc-primary);
  color: var(--itbc-primary-fg);
  border: 1px solid var(--itbc-primary);
}

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

.itbc-feedback {
  display: none;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background-color: var(--itbc-feedback-bg);
  color: var(--itbc-feedback-text);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}

.itbc-generator-section {
  border-top: 1px solid var(--itbc-border);
  padding-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.itbc-section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--itbc-text);
  margin: 0 0 0.75rem 0;
}

.itbc-gen-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem;
}

.itbc-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1 1 200px;
}

.itbc-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--itbc-text);
}

.itbc-select, .itbc-num-input {
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--itbc-border);
  border-radius: 6px;
  background-color: var(--itbc-stat-bg);
  color: var(--itbc-text);
}

.itbc-btn-align {
  align-self: flex-end;
}

.itbc-test-section {
  border-top: 1px solid var(--itbc-border);
  padding-top: 1.5rem;
}

.itbc-test-intro {
  font-size: 0.8125rem;
  color: var(--itbc-muted);
  margin: 0 0 0.75rem 0;
}

.itbc-test-wrapper {
  margin-bottom: 0.75rem;
}

.itbc-textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--itbc-text);
  background-color: var(--itbc-stat-bg);
  border: 1px solid var(--itbc-border);
  border-radius: 8px;
  resize: vertical;
}

.itbc-textarea:focus {
  outline: 2px solid var(--itbc-primary);
  outline-offset: -1px;
}

.itbc-stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: var(--itbc-stat-bg);
  border: 1px solid var(--itbc-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
}

.itbc-stat-item {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  font-size: 0.8125rem;
}

.itbc-stat-label {
  color: var(--itbc-muted);
}

.itbc-stat-val {
  font-weight: 700;
  color: var(--itbc-text);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

@media (max-width: 600px) {
  .itbc-cards-grid {
    grid-template-columns: 1fr;
  }
  .itbc-gen-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .itbc-stats-bar {
    flex-direction: column;
    gap: 0.5rem;
  }
}
/* 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"] {
  --itbc-bg-card: var(--tf-surface);
  --itbc-border: var(--tf-surface);
  --itbc-text: var(--tf-ink);
  --itbc-muted: var(--tf-ink-faint);
  --itbc-primary: #8182da;
  --itbc-primary-hover: #8681da;
  --itbc-primary-fg: var(--tf-surface);
  --itbc-btn-bg: var(--tf-surface);
  --itbc-btn-border: #98abc3;
  --itbc-btn-hover: var(--tf-surface);
  --itbc-stat-bg: var(--tf-surface);
  --itbc-badge-bg: var(--tf-surface);
  --itbc-badge-text: #a481da;
  --itbc-feedback-bg: var(--tf-surface);
  --itbc-feedback-text: #8681da;
}