:root {
  --lab-paper: #f7f6f2;
  --lab-white: #fff;
  --lab-ink: #181818;
  --lab-copy: #403b36;
  --lab-line: #ddd7cf;
  --lab-accent: #aa8057;
}
.lab-page {
  background: var(--lab-paper);
  color: var(--lab-ink);
}
.lab-page .section {
  padding: 4rem 4vw;
}
.lab-intro {
  border-bottom: 1px solid var(--lab-line);
}
.lab-intro h1 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(3rem, 6vw, 5.5rem);
  line-height: 0.95;
  margin: 0.4rem 0 1rem;
  font-weight: 500;
}
.lab-lede {
  max-width: 700px;
  color: var(--lab-copy);
  line-height: 1.7;
}
.lab-browser-head {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: 1.5rem;
}
.lab-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.lab-filter {
  border: 1px solid var(--lab-line);
  background: transparent;
  border-radius: 999px;
  padding: 0.65rem 1.1rem;
  cursor: pointer;
}
.lab-filter.active,
.lab-filter:hover {
  background: var(--lab-accent);
  border-color: var(--lab-accent);
  color: white;
}
.lab-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: stretch;
}
.experiment-list {
  display: grid;
  gap: 0.7rem;
  align-self: stretch;
}
.experiment-card {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 0.8rem;
  align-items: center;
  padding: 1rem;
  border: 1px solid var(--lab-line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.experiment-card.active,
.experiment-card:hover {
  border-color: var(--lab-accent);
}
.experiment-num {
  color: var(--lab-accent);
}
.experiment-body {
  display: grid;
  gap: 0.3rem;
}
.experiment-body strong {
  font-family: "Playfair Display", Georgia, serif;
}
.experiment-body small {
  color: var(--lab-copy);
}
.experiment-shell {
  background: white;
  border: 1px solid var(--lab-line);
  min-width: 0;
  height: 690px;
  display: grid;
  grid-template-rows: 205px 50px minmax(0, 1fr);
  overflow: hidden;
}
.experiment-header {
  height: 205px;
  box-sizing: border-box;
  padding: 1.5rem 1.8rem 1rem;
  overflow: hidden;
}
.experiment-kicker {
  color: var(--lab-accent);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}
.experiment-header h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2rem, 3.5vw, 3.4rem);
  font-weight: 500;
  margin: 0.2rem 0;
}
.experiment-tabs {
  height: 50px;
  box-sizing: border-box;
  display: flex;
  align-items: end;
  gap: 2rem;
  padding: 0 1.8rem;
  border-bottom: 1px solid var(--lab-line);
  overflow-x: auto;
  overflow-y: hidden;
}
.experiment-tab {
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  padding: 0.8rem 0;
  text-transform: uppercase;
  font-size: 0.77rem;
  letter-spacing: 0.05em;
  cursor: pointer;
}
.experiment-tab.active {
  border-bottom-color: var(--lab-accent);
}
.experiment-content {
  min-height: 0;
  height: 100%;
  overflow: hidden;
}
.experiment-stage {
  height: 100%;
  min-height: 0;
  padding: 1.2rem;
  box-sizing: border-box;
  overflow-y: auto;
}
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  height: 100%;
  min-height: 0;
}
.lab-card {
  border: 1px solid var(--lab-line);
  padding: 1.15rem;
}
.two-col > .lab-card {
  height: 100%;
  min-height: 0;
  box-sizing: border-box;
  overflow-y: auto;
}
.lab-card h3 {
  font-family: "Playfair Display", Georgia, serif;
  margin-top: 0;
}
textarea {
  width: 100%;
  min-height: 140px;
  box-sizing: border-box;
  border: 1px solid var(--lab-line);
  padding: 0.8rem;
  font: inherit;
  resize: vertical;
}
.primary-btn {
  width: 100%;
  margin-top: 1rem;
  padding: 0.8rem;
  border: 1px solid var(--lab-ink);
  background: var(--lab-ink);
  color: #fff;
  cursor: pointer;
}
.response-box {
  min-height: 0px;
  max-height: 250px;
  overflow-y: auto;
  padding: 1rem;
  border: 1px solid var(--lab-line);
  background: #fbfaf7;
  line-height: 1.7;
}
.source-list {
  display: grid;
  gap: 0.55rem;
  margin-top: 1rem;
}
.source-item {
  border: 1px solid var(--lab-line);
  padding: 0.75rem;
}
.stage-copy {
  max-width: 960px;
  padding: 1.2rem;
}
.stage-copy h3 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2rem, 3vw, 3.4rem);
  font-weight: 500;
}
.stage-copy > p {
  color: var(--lab-copy);
  line-height: 1.7;
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin-top: 1.4rem;
}
.scenario {
  min-height: 90px;
  border: 1px solid var(--lab-line);
  background: transparent;
  padding: 1rem;
  text-align: left;
}
.evaluation-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  border-top: 1px solid var(--lab-line);
  border-bottom: 1px solid var(--lab-line);
  margin: 1.4rem 0;
}
.evaluation-metrics article {
  padding: 1rem;
  border-right: 1px solid var(--lab-line);
}
.evaluation-metrics span,
.evaluation-metrics strong {
  display: block;
}
.evaluation-metrics strong {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.6rem;
}
.model-controls {
  display: grid;
  gap: 0.9rem;
}

.model-control {
  display: grid;
  gap: 0.4rem;
}

.model-control > span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.model-control strong {
  flex-shrink: 0;
  text-align: right;
}

.model-control input,
.model-control select {
  width: 100%;
  box-sizing: border-box;
  accent-color: var(--lab-accent);
}
.prediction-primary,
.prediction-confidence {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--lab-line);
}

.prediction-primary span,
.prediction-confidence span,
.prediction-probabilities h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--lab-copy);
}

.prediction-primary strong {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 500;
}

.prediction-confidence strong {
  font-size: 1.5rem;
}

.prediction-probabilities {
  margin-top: 1.5rem;
}

.probability-row {
  display: flex;
  justify-content: space-between;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--lab-line);
}
@media (max-width: 900px) {
  .lab-browser-head,
  .lab-layout {
    grid-template-columns: 1fr;
  }
  .experiment-list {
    display: flex;
    overflow-x: auto;
  }
  .experiment-card {
    flex: 0 0 250px;
  }
}
@media (max-width: 700px) {
  .two-col,
  .scenario-grid {
    grid-template-columns: 1fr;
  }
}