/* Cell biology lab — scoped to .cell-lab */

.cell-lab {
  --cell-accent: var(--chip-biology);
  --cell-accent-2: #4f9f72;
  --cell-nucleus: #9b7ed4;
  --cell-mito: #e05555;
  --cell-er: #d4c45e;
  --cell-golgi: #e8963a;
  --cell-ribo: #7caad4;
  --cell-lyso: #c97e50;
  --cell-membrane: #5bc0a8;
  --cell-cytoplasm: #a8d5ba;
  --cell-chloro: #4caf50;
  --cell-vacuole: #81d4fa;
  --cell-muted: var(--color-text-muted);
  max-width: 960px;
  font-family: var(--font-body);
}

.cell-lab__header { margin-bottom: var(--space-6); }

.cell-lab__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cell-accent);
  margin-bottom: var(--space-2);
}

.cell-lab__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: var(--space-3);
}

.cell-lab__intro {
  font-size: var(--text-sm);
  color: var(--cell-muted);
  line-height: 1.65;
  max-width: 64ch;
}

.cell-lab__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.cell-lab__tab {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--cell-muted);
  cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.cell-lab__tab:hover {
  color: var(--color-text);
  border-color: oklch(from var(--cell-accent) l c h / 0.48);
}

.cell-lab__tab[aria-selected="true"] {
  color: var(--color-bg);
  background: linear-gradient(125deg, oklch(from var(--cell-accent) l c h / 0.9), var(--cell-nucleus));
  border-color: transparent;
  box-shadow: 0 0 20px oklch(from var(--cell-accent) l c h / 0.18);
}

.cell-lab__tab:focus-visible {
  outline: 2px solid var(--cell-accent);
  outline-offset: 2px;
}

.cell-lab__panel {
  display: none;
  animation: cell-lab-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.cell-lab__panel.is-active { display: block; }

@keyframes cell-lab-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .cell-lab__panel { animation: none; }
}

.cell-lab__section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.cell-lab__fine {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-6);
  line-height: 1.5;
  max-width: 68ch;
}

.cell-lab__btn {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.52rem 1.1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-interactive), border-color var(--transition-interactive);
}

.cell-lab__btn:hover { border-color: oklch(from var(--cell-accent) l c h / 0.5); }

.cell-lab__btn--primary {
  background: oklch(from var(--cell-accent) l c h / 0.18);
  border-color: var(--cell-accent);
}

.cell-lab__diagram-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(220px, 0.7fr);
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.cell-lab__diagram-card,
.cell-lab__diagram-side,
.cell-lab__membrane-card,
.cell-lab__sav-card {
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-divider);
  background: oklch(from var(--color-text) l c h / 0.03);
}

.cell-lab__svg-wrap {
  border-radius: calc(var(--radius-xl) - 0.35rem);
  overflow: hidden;
  border: 1px solid oklch(from var(--cell-accent) l c h / 0.18);
  background:
    radial-gradient(circle at 35% 30%, oklch(from var(--cell-accent) l c h / 0.1), transparent 35%),
    radial-gradient(circle at 78% 24%, oklch(from var(--cell-vacuole) l c h / 0.12), transparent 28%),
    oklch(from var(--color-text) l c h / 0.03);
  margin-bottom: var(--space-4);
}

.cell-lab__svg {
  display: block;
  width: 100%;
  height: auto;
}

.cell-lab__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.cell-lab__legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--text-xs);
  color: var(--color-text);
}

.cell-lab__legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.cell-lab__scorecard {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-full);
  background: oklch(from var(--cell-accent) l c h / 0.12);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.cell-lab__hint {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--cell-muted);
}

.cell-lab .lg-dd__zone--over {
  border-color: var(--cell-accent);
  background: oklch(from var(--cell-accent) l c h / 0.07);
}

.cell-lab .lg-dd__chip:hover,
.cell-lab .lg-order__arrow:hover:not(:disabled),
.cell-lab .lg-mc__choice:hover:not(:disabled),
.cell-lab .lg-sprint__choice:hover:not(:disabled) {
  border-color: oklch(from var(--cell-accent) l c h / 0.48);
}

.cell-lab__zone-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  margin-right: 0.4rem;
}

.cell-lab__membrane-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.9fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.cell-lab__membrane-stage {
  border-radius: var(--radius-xl);
  border: 1px solid oklch(from var(--cell-accent) l c h / 0.18);
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(223,138,157,0.05) 0, rgba(223,138,157,0.05) 48%, rgba(135,214,160,0.05) 52%, rgba(135,214,160,0.05) 100%),
    oklch(from var(--color-text) l c h / 0.03);
  box-shadow: inset 0 0 0 1px oklch(from var(--cell-accent) l c h / 0.06);
}

.cell-lab__membrane-canvas {
  display: block;
  width: 100%;
  height: 320px;
}

.cell-lab__membrane-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.cell-lab__meta-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: 0.35rem;
}

.cell-lab__membrane-meta strong,
.cell-lab__membrane-meta span:last-child {
  font-size: var(--text-sm);
  color: var(--color-text);
}

.cell-lab__method-grid {
  display: grid;
  gap: var(--space-2);
}

.cell-lab__method-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition-interactive), background var(--transition-interactive), transform var(--transition-interactive);
}

.cell-lab__method-btn:hover:not(:disabled) {
  border-color: var(--cell-accent);
  transform: translateY(-1px);
}

.cell-lab__method-btn:disabled { cursor: default; }

.cell-lab__method-btn--correct {
  border-color: var(--cell-accent);
  background: oklch(from var(--cell-accent) l c h / 0.12);
}

.cell-lab__method-btn--wrong {
  border-color: var(--lab-error);
  background: var(--lab-error-bg);
}

.cell-lab__scoreline {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--cell-accent);
}

.cell-lab__transport-notes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}

.cell-lab__transport-note {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: oklch(from var(--color-text) l c h / 0.025);
}

.cell-lab__transport-note strong {
  display: block;
  color: var(--color-text);
  margin-bottom: 0.35rem;
}

.cell-lab__transport-note span {
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--cell-muted);
}

.cell-lab__sav-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.cell-lab__sav-card--visual {
  background:
    radial-gradient(circle at 50% 35%, oklch(from var(--cell-accent) l c h / 0.08), transparent 42%),
    oklch(from var(--color-text) l c h / 0.03);
}

.cell-lab__sav-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.cell-lab__sav-range {
  width: 100%;
  accent-color: var(--cell-accent);
  margin-bottom: var(--space-4);
}

.cell-lab__sav-equations {
  display: grid;
  gap: var(--space-3);
}

.cell-lab__sav-equations div {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.cell-lab__sav-equations span {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: 0.3rem;
}

.cell-lab__sav-equations strong {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.cell-lab__sav-sphere-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  margin-bottom: var(--space-4);
}

.cell-lab__sav-sphere {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, rgba(255,255,255,0.55), transparent 38%),
    radial-gradient(circle at 50% 50%, oklch(from var(--cell-vacuole) l c h / 0.85), oklch(from var(--cell-accent) l c h / 0.6));
  box-shadow: 0 0 24px oklch(from var(--cell-accent) l c h / 0.18);
  transition: width 0.3s ease, height 0.3s ease;
}

.cell-lab__sav-chart {
  display: grid;
  gap: var(--space-3);
}

.cell-lab__sav-row {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: var(--space-3);
  align-items: center;
  font-size: var(--text-sm);
}

.cell-lab__sav-track {
  height: 1rem;
  border-radius: var(--radius-full);
  background: oklch(from var(--color-text) l c h / 0.06);
  overflow: hidden;
}

.cell-lab__sav-bar {
  height: 100%;
  min-width: 2px;
  border-radius: var(--radius-full);
  transition: width 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.cell-lab__sav-bar--area {
  background: linear-gradient(90deg, var(--cell-nucleus), #c9b7f1);
}

.cell-lab__sav-bar--volume {
  background: linear-gradient(90deg, var(--cell-mito), #ffad6f);
}

.cell-lab__sav-bar--ratio {
  background: linear-gradient(90deg, var(--cell-accent), var(--cell-accent-2));
}

.cell-lab__note {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--cell-muted);
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-divider);
  background: oklch(from var(--cell-nucleus) l c h / 0.06);
  margin-bottom: var(--space-5);
}

.cell-lab__note strong { color: var(--color-text); }

.cell-lab-sprint .lg-sprint__score-val,
.cell-lab-sprint .lg-sprint__timer {
  color: var(--cell-accent);
}

.cell-lab-sprint .lg-sprint__progress-bar {
  background: var(--cell-accent);
}

@media (max-width: 760px) {
  .cell-lab__diagram-grid,
  .cell-lab__membrane-grid,
  .cell-lab__sav-grid {
    grid-template-columns: 1fr;
  }

  .cell-lab__membrane-meta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .cell-lab__membrane-canvas { height: 260px; }

  .cell-lab__sav-row {
    grid-template-columns: 1fr;
  }
}