.lab-main {
  width: min(72rem, calc(100% - 4rem));
  margin-inline: auto;
}

.lab-intro {
  max-width: 52rem;
  padding-block: 3.5rem 2.5rem;
}
.lab-intro h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  font-weight: 500;
}
.lab-intro > p:not(.eyebrow) {
  color: var(--muted);
}
.experiment-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: 0.875rem;
}
.experiment {
  margin-bottom: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--ink);
}
.experiment-heading h2 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
}
.experiment > p {
  max-width: 64rem;
  font-size: 0.9rem;
}
.experiment code {
  padding: 0.1em 0.25em;
  background: var(--soft-green);
  font-size: 0.9em;
}
.mode-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin: 1.5rem 0 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
}
.mode-picker legend {
  padding-inline: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
}
.mode-picker label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}
.mode-picker label span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}
.mode-picker input {
  flex: none;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--green);
}
button:disabled {
  cursor: wait;
  opacity: 0.65;
}
.experiment-status {
  min-height: 1.75em;
  margin-block: 1rem;
  color: var(--green);
  font-weight: 500;
}
.race-evidence {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 1rem;
}
.evidence-panel {
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--card);
}
.evidence-panel h3 {
  margin-bottom: 1.25rem;
  font-family: var(--serif);
  font-size: 1.2rem;
}
.evidence-values {
  margin: 0;
  font-size: 0.875rem;
}
.evidence-values > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.3rem 1rem;
  padding-block: 0.6rem;
  border-bottom: 1px solid var(--line);
}
.evidence-values dt {
  color: var(--muted);
}
.evidence-values dd {
  margin: 0;
  font-weight: 600;
}
.result-preview {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--soft-green);
}
.result-preview p:last-child {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
}
.event-log {
  margin: 0;
  padding-left: 1.25rem;
  font-size: 0.8rem;
  line-height: 1.8;
}
.event-log li {
  padding-bottom: 0.6rem;
}
.event-log .discarded {
  color: #884324;
}
.event-log .accepted {
  color: var(--green);
}
.explanation {
  margin-top: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 0.85rem;
}
.explanation summary {
  cursor: pointer;
  color: var(--green);
  font-weight: 600;
}
.explanation p {
  max-width: 60rem;
  margin: 1rem 0 0;
  color: var(--muted);
}
.performance-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 1rem 1.5rem;
  margin-block: 1.5rem;
}
.performance-controls > label {
  display: grid;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
}
.performance-controls select {
  max-width: 100%;
  min-height: 2.8rem;
  padding: 0.6rem 2rem 0.6rem 0.75rem;
  border: 1px solid var(--green);
  border-radius: 3px;
  color: var(--ink);
  background: var(--card);
  font: inherit;
  font-size: 0.875rem;
}
.run-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.responsiveness-probe {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--soft-green);
  font-size: 0.85rem;
}
.responsiveness-probe strong {
  display: inline-block;
  min-width: 3.5ch;
  margin-left: 0.25rem;
  font-variant-numeric: tabular-nums;
}
.responsiveness-probe small {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
}
.heartbeat-dot {
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  margin-right: 0.4rem;
  border-radius: 50%;
  background: var(--green);
}
.secondary-button {
  margin-right: 0.75rem;
  color: var(--green);
  background: var(--card);
}
.secondary-button:hover {
  color: var(--card);
}
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--card);
}
.measurement-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.8rem;
}
.measurement-table caption {
  padding: 1rem;
  color: var(--muted);
  text-align: left;
  font-size: 0.75rem;
}
.measurement-table th,
.measurement-table td {
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--line);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.measurement-table thead th {
  color: var(--muted);
  font-weight: 500;
}
.checksum-status {
  margin-block: 1rem 0.5rem;
  color: var(--green);
}
.experiment .measurement-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.8rem;
}
.notice {
  padding: 1rem;
  border: 1px solid #884324;
  color: #884324;
}
.lab-closing {
  font-family: var(--serif);
  font-size: 1.1rem;
}

@media (max-width: 48rem) {
  .lab-main {
    width: calc(100% - 2rem);
  }
  .lab-intro {
    padding-block: 2.5rem 2rem;
  }
  .race-evidence {
    grid-template-columns: 1fr;
  }
  .evidence-panel {
    padding: 1.1rem;
  }
  .mode-picker {
    flex-direction: column;
  }
  .mode-picker label {
    align-items: start;
  }
  .mode-picker input {
    margin-top: 0.25rem;
  }
  .mode-picker label span {
    flex-basis: 100%;
    margin-left: 1.4rem;
  }
}