:root {
  --lab-navy: #111a36;
  --lab-blue: #3158d4;
  --lab-blue-soft: #e7ecff;
  --lab-amber: #e6a738;
  --lab-coral: #b4451f;
  --lab-forest: #123f35;
  --lab-cream: #f7f3ea;
}

.lab-hero {
  min-height: 39rem;
  align-items: center;
}

.lab-hero h1 {
  max-width: 930px;
  font-size: clamp(3.5rem, 7.6vw, 7rem);
}

.hero-actions,
.closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.lab-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--dark);
  border-radius: 999px;
  color: #fff;
  background: var(--dark);
  font: 800 0.72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
}

.lab-button:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.lab-button.secondary {
  color: var(--dark);
  background: transparent;
}

.lab-button.secondary:hover {
  color: var(--dark);
  background: var(--accent-soft);
}

.lucide-inline {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.experiment-definition {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 4rem 0 6rem;
  border-top: 5px solid var(--signal);
  border-bottom: 1px solid var(--line);
}

.experiment-definition article {
  padding: 1.5rem 1.5rem 1.7rem 0;
}

.experiment-definition article + article {
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}

.experiment-definition .lucide {
  margin-bottom: 1.2rem;
  color: var(--accent);
}

.experiment-definition p,
.pressure-card p,
.evidence-card p,
.case-card p,
.limit-grid p {
  color: var(--muted);
}

.pressure-card {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(2rem, 6vw, 6rem);
  margin: 6rem 0;
  padding: clamp(2rem, 5vw, 4rem);
  color: #fff;
  background: var(--dark);
  border-radius: 20px;
}

.pressure-card h2 {
  margin: 0;
  padding: 0;
  color: #fff;
  border: 0;
}

.pressure-card p {
  margin: 0;
  color: var(--dark-muted);
}

.pressure-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.pressure-list li {
  display: flex;
  gap: 0.6rem;
  margin: 0;
  color: var(--dark-muted);
  font-size: 0.86rem;
}

.pressure-list .lucide-inline {
  flex: 0 0 auto;
  margin-top: 0.3rem;
  color: var(--signal);
}

.experiment-loop {
  margin: 6rem 0;
}

.experiment-loop > header {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.experiment-loop h2 {
  margin: 0;
  padding: 0;
  border: 0;
}

.experiment-loop header p {
  margin: 0;
  color: var(--muted);
}

.loop-track {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
}

.loop-step {
  margin: 0;
  padding: 1rem 0.85rem 1.15rem;
  border-left: 1px solid var(--line);
}

.loop-step:first-child {
  border-left: 0;
}

.loop-step b {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--dark);
  font-size: 0.88rem;
  letter-spacing: -0.02em;
}

.loop-step span {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.4;
}

/* Hard kill any legacy arrow / number pseudo-elements. */
.loop-step::before,
.loop-step::after,
.loop-step + .loop-step::before,
.loop-track::before {
  content: none !important;
  display: none !important;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0 6rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--line);
}

.evidence-card {
  display: flex;
  min-height: 320px;
  flex-direction: column;
  padding: 1.6rem;
  background: var(--surface);
}

.evidence-card .lucide {
  color: var(--accent);
}

.evidence-card h3 {
  margin-top: 3rem;
}

.evidence-card p {
  margin-bottom: 2rem;
  font-size: 0.93rem;
}

.evidence-card a {
  margin-top: auto;
  color: var(--dark);
  font-weight: 800;
  text-decoration: none;
}

.evidence-card a::after,
.case-card a::after {
  margin-left: 0.45rem;
  color: var(--signal);
  content: "→";
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
  margin: 2rem 0 6rem;
}

.case-card {
  display: flex;
  min-height: 330px;
  flex-direction: column;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-top: 5px solid var(--accent);
  border-radius: 14px;
  background: var(--surface);
}

.case-card:nth-child(2) {
  border-top-color: var(--signal);
}

.case-card:nth-child(3) {
  border-top-color: var(--lab-forest);
}

.case-card .case-number {
  color: var(--muted);
  font: 800 0.72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.1em;
}

.case-card h3 {
  margin-top: 3rem;
}

.case-card a {
  margin-top: auto;
  color: var(--dark);
  font-weight: 800;
  text-decoration: none;
}

.limits-panel {
  margin: 6rem 0;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--surface) 84%, var(--accent-soft));
}

.limits-panel h2 {
  margin: 0;
  padding: 0;
  border: 0;
}

.limit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
}

.limit-grid article {
  padding: 1.25rem 1.5rem 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.limit-grid article:nth-child(even) {
  padding-right: 0;
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}

.limit-grid p {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
}

.lab-closing {
  margin-top: 7rem;
}

.lab-closing .closing-actions {
  margin-top: 2.2rem;
}

.reference-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.reference-group {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.reference-group ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.reference-group li {
  margin: 0.45rem 0;
  color: var(--muted);
}

.reference-status {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--accent);
  font: 800 0.68rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

@media (max-width: 1100px) {
  .loop-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .loop-step {
    border-left: 1px solid var(--line);
  }

  .loop-step:nth-child(odd) {
    border-left: 0;
  }

  .loop-step:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 820px) {
  .lab-hero {
    min-height: 0;
  }

  .experiment-definition,
  .pressure-card,
  .experiment-loop > header,
  .evidence-grid,
  .case-grid,
  .reference-index {
    grid-template-columns: 1fr;
  }

  .experiment-definition article + article {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .pressure-list,
  .limit-grid {
    grid-template-columns: 1fr;
  }

  .limit-grid article,
  .limit-grid article:nth-child(even) {
    padding-right: 0;
    padding-left: 0;
    border-left: 0;
  }

  .loop-track {
    grid-template-columns: 1fr;
  }

  .loop-step {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .loop-step:first-child {
    border-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lab-button {
    transition: none;
  }
}

@media print {
  .hero-actions,
  .closing-actions {
    display: none;
  }

  .pressure-card,
  .limits-panel,
  .evidence-card,
  .case-card {
    color: #000;
    background: #fff;
    box-shadow: none;
    break-inside: avoid;
  }

  .pressure-card h2,
  .pressure-card p,
  .pressure-list li {
    color: #000;
  }
}