:root {
  --tf-accent-soft: rgba(55, 71, 79, 0.12);
  --tf-accent-wash: rgba(55, 71, 79, 0.05);
  --tf-border: #dedbd5;
  --tf-card-bg: #ffffff;
  --tf-input-bg: #faf9f7;
}

.scb-main {
  box-sizing: border-box;
  max-width: 46rem;
  margin-inline: auto;
  padding: 2rem 1.25rem 4rem;
}

.scb-app-card {
  box-sizing: border-box;
  margin-inline: auto;
  max-width: 46rem;
  background: var(--tf-surface);
  border: 1px solid var(--tf-rule);
  border-radius: 2px;
  padding: 1.75rem;
  margin-bottom: 2.5rem;
}

.scb-top-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--tf-rule);
}

.scb-mode-selector {
  display: inline-flex;
  background: var(--tf-accent-wash);
  padding: 3px;
  border-radius: 2px;
  border: 1px solid var(--tf-accent-soft);
}

.scb-tab-btn {
  background: transparent;
  border: none;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: 2px;
  cursor: pointer;
  color: var(--tf-ink-soft);
  transition: all 0.15s ease;
}

.scb-tab-btn.active {
  background: var(--tf-surface);
  color: var(--tf-ink);
  box-shadow: none;
}

.scb-form {
  display: block;
}

.scb-mode-panel {
  display: block;
}

.scb-callout {
  background: var(--tf-accent-wash);
  border-left: 3px solid var(--tf-accent);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  border-radius: 2px;
  font-size: 0.88rem;
  color: var(--tf-ink);
  line-height: 1.45;
}

.scb-callout p {
  margin: 0;
}

.scb-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.scb-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.scb-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--tf-ink);
}

.scb-input,
.scb-select {
  background: var(--tf-surface);
  border: 1px solid var(--tf-rule);
  color: var(--tf-ink);
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  border-radius: 2px;
  font-family: inherit;
  width: 100%;
  box-sizing: border-box;
}

.scb-input:focus,
.scb-select:focus {
  outline: none;
  border-color: var(--tf-accent);
}

.scb-actions-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.scb-btn-primary {
  background: var(--tf-accent);
  color: var(--tf-accent-ink, #ffffff);
  border: 1px solid var(--tf-accent);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.4rem;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.scb-btn-primary:hover {
  background: var(--tf-accent-hover);
}

.scb-btn-secondary {
  background: var(--tf-surface);
  color: var(--tf-ink);
  border: 1px solid var(--tf-rule);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.65rem 1rem;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.scb-btn-secondary:hover {
  border-color: var(--tf-accent);
  color: var(--tf-accent);
}

.scb-results {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--tf-rule);
}

.scb-results-header {
  margin-bottom: 1.5rem;
}

.scb-results-title {
  font-family: Charter, "Iowan Old Style", Georgia, serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--tf-ink);
  margin: 0 0 0.4rem;
}

.scb-results-sub {
  font-size: 0.9rem;
  color: var(--tf-ink-soft);
  margin: 0;
}

.scb-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.scb-cycle-card {
  background: var(--tf-surface);
  border: 1px solid var(--tf-rule);
  border-radius: 2px;
  padding: 1.25rem 1rem;
  text-align: center;
  position: relative;
  transition: border-color 0.15s ease;
}

.scb-cycle-card.scb-recommended {
  border-color: var(--tf-accent);
  background: var(--tf-accent-wash);
}

.scb-card-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.6rem;
  background: var(--tf-accent-soft);
  color: var(--tf-accent);
}

.scb-card-time {
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--tf-accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.scb-card-cycles {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--tf-ink);
  margin-bottom: 0.25rem;
}

.scb-card-duration {
  font-size: 0.8rem;
  color: var(--tf-ink-soft);
  margin-bottom: 0.5rem;
}

.scb-card-note {
  font-size: 0.78rem;
  color: var(--tf-ink-soft);
  line-height: 1.35;
}

.scb-science-box {
  background: var(--tf-accent-wash);
  border: 1px solid var(--tf-accent-soft);
  border-radius: 2px;
  padding: 1.25rem;
  margin-bottom: 1.75rem;
}

.scb-science-title {
  font-family: Charter, "Iowan Old Style", Georgia, serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--tf-ink);
  margin: 0 0 0.75rem;
}

.scb-stages-bar {
  display: flex;
  height: 28px;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.75rem;
  border: 1px solid var(--tf-accent-soft);
}

.scb-stage-item {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: #ffffff;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  padding: 0 0.25rem;
}

.scb-stage-light {
  background: var(--tf-accent);
}

.scb-stage-deep {
  background: color-mix(in srgb, var(--tf-accent) 70%, #000);
}

.scb-stage-rem {
  background: color-mix(in srgb, var(--tf-accent) 85%, #fff);
  color: var(--tf-accent);
}

.scb-science-desc {
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--tf-ink-soft);
  margin: 0;
}

.scb-export-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.scb-toast {
  font-size: 0.85rem;
  color: var(--tf-accent);
  background: var(--tf-accent-wash);
  padding: 0.4rem 0.8rem;
  border-radius: 2px;
  border: 1px solid var(--tf-accent-soft);
  animation: fadeIn 0.2s ease;
}

.scb-hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .scb-app-card {
  box-sizing: border-box;
  margin-inline: auto;
  max-width: 46rem;
    padding: 1.25rem;
  }
  .scb-top-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .scb-mode-selector {
    display: flex;
  }
  .scb-tab-btn {
    flex: 1;
    text-align: center;
  }
  .scb-cards-grid {
    grid-template-columns: 1fr 1fr;
  }
  .scb-export-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .scb-export-bar button {
    width: 100%;
  }
}

/* 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"] {
  --tf-border: var(--tf-rule);
  --tf-card-bg: var(--tf-surface);
  --tf-input-bg: var(--tf-surface);
}