.resize-lab { --lab-surface: #edf3e9; --lab-low: #34664f; --lab-high: #825421; --lab-high-soft: #f3e9d8; margin-top: 28px; border: 1px solid #cbdcc7; border-radius: 14px; background: var(--color-surface); }
.resize-lab > summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; padding: 16px 24px; cursor: pointer; font-size: 16px; font-weight: 600; list-style: none; }
.resize-lab > summary::-webkit-details-marker { display: none; }
.lab-summary-meta { display: flex; align-items: center; gap: 14px; font-size: 14px; color: var(--reading-muted); font-weight: 400; font-variant-numeric: tabular-nums; }
.resize-lab[open] > summary { border-bottom: 1px solid var(--color-border); }
.resize-lab[open] > summary svg { transform: rotate(180deg); }
.lab-body { padding: 24px; font-size: 14px; line-height: 1.7; }
.lab-scene-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.lab-scene-heading > :first-child { font-size: 20px; font-weight: 600; letter-spacing: -.02em; }
.lab-scene-heading > :last-child { flex-shrink: 0; font-size: 12px; font-variant-numeric: tabular-nums; color: var(--reading-muted); }
.prose .lab-caption { margin: 8px 0 26px; font-size: 12px; color: var(--reading-muted); }
.lab-scene { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; }
.lab-source { grid-column: 1 / -1; }
.lab-target .lab-array-heading { flex-wrap: wrap; }
.lab-array-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 10px; font-size: 13px; }
.lab-array-heading > span { color: var(--reading-muted); font-size: 11px; }
.lab-bucket { display: grid; grid-template-columns: 36px minmax(0, 1fr); align-items: center; column-gap: 14px; padding: 12px 14px; background: var(--lab-surface); border-radius: 8px; }
.lab-bucket-index { font: 600 20px/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace; }
.lab-bucket-index > span { display: block; margin-top: 4px; color: var(--reading-muted); font: 10px/1.4 var(--font-sans); }
.lab-slots { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; min-width: 0; }
.lab-slot { position: relative; display: block; height: 42px; border: 1px dashed #b2c6ac; border-radius: 6px; }
.lab-slot:not(:last-child)::after { content: ''; position: absolute; width: 8px; height: 1px; right: -11px; top: 50%; background: #9db496; }
.hash-node { position: relative; display: grid; place-items: center; width: calc(100% + 2px); height: 44px; margin: -1px; border: 1px solid #bfd1b9; border-radius: 6px; color: var(--color-text); background: #fff; font: 500 19px/1 ui-monospace, "SFMono-Regular", Consolas, monospace; z-index: 1; }
.hash-node.is-current { outline: 2px solid var(--color-accent); outline-offset: 3px; z-index: 3; }
.hash-node.is-moving { z-index: 4; }
.lab-low { margin-top: 8px; }
.lab-high { margin-top: 8px; background: var(--lab-high-soft); }
.lab-low .hash-node { color: #fff; background: var(--lab-low); border-color: var(--lab-low); }
.lab-high .hash-node { color: #fff; background: var(--lab-high); border-color: var(--lab-high); }
.lab-high .lab-slot { border-color: #cbb99f; }
.lab-high .lab-slot::after { background: #c0aa8c; }
.lab-route-label { grid-column: 2; margin-top: 6px; color: var(--reading-muted); font-size: 10px; }
.lab-high .lab-route-label { color: var(--lab-high); }
.lab-inspector { padding-top: 4px; }
.lab-inspector-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 12px; font-size: 12px; }
.lab-bit-label { color: var(--reading-muted); font-size: 10px; }
.lab-binary-row { display: grid; grid-template-columns: 74px minmax(0, 1fr); align-items: center; gap: 8px; margin: 5px 0; }
.lab-binary-label { color: var(--reading-muted); font: 12px/1.6 ui-monospace, "SFMono-Regular", Consolas, monospace; white-space: nowrap; }
.lab-bits { display: grid; grid-template-columns: repeat(8, 1fr); gap: 4px; font: 16px/32px ui-monospace, "SFMono-Regular", Consolas, monospace; text-align: center; color: #607258; }
.lab-bits .decision-bit { color: var(--lab-low); background: #dfebd9; border-radius: 4px; font-weight: 700; }
.lab-inspector[data-route="high"] .decision-bit { color: var(--lab-high); background: #eed9b9; }
.prose .lab-equation { min-height: 26px; margin: 10px 0 0; font-size: 12px; font-weight: 500; color: var(--color-text); }
.lab-feedback { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--color-border); }
.lab-step { display: block; color: var(--reading-muted); font-size: 11px; }
.prose .lab-feedback p { min-height: 72px; margin: 7px 0 12px; font-size: 14px; }
.lab-controls { position: sticky; top: 76px; z-index: 5; display: flex; flex-wrap: wrap; gap: 8px; margin: -8px 0 22px; padding: 8px 0; background: var(--color-surface); }
.lab-controls[hidden] { display: none; }
.lab-controls button { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 44px; padding: 8px 12px; border: 1px solid #cbdcc7; border-radius: 7px; background: transparent; font-size: 13px; cursor: pointer; touch-action: manipulation; }
.lab-controls button:hover { background: #e9f1e4; }
.lab-controls .lab-play { min-width: 94px; border-color: var(--color-text); background: var(--color-text); color: var(--color-surface); }
.lab-controls .lab-play:hover { background: var(--lab-low); }
.lab-controls .lab-change { margin-left: auto; border-color: transparent; color: var(--reading-muted); }
.lab-controls button:disabled { opacity: .5; cursor: default; }
.lab-controls svg { width: 16px; height: 16px; }
.prose .lab-example-name { margin: 12px 0 20px; font-size: 11px; color: var(--reading-muted); }
.lab-explanation { border-top: 1px solid var(--color-border); }
.lab-explanation summary { padding: 12px 0; min-height: 44px; font-size: 13px; cursor: pointer; }
.prose .lab-explanation p, .prose .lab-fallback { font-size: 13px; }
.prose .lab-scope { margin: 12px 0 0; color: var(--reading-muted); font-size: 11px; line-height: 1.8; }
@media (max-width: 1100px) {
  .lab-scene { grid-template-columns: minmax(0, 1fr); gap: 20px; }
}
@media (max-width: 520px) {
  .resize-lab > summary { padding-inline: 16px; }
  .lab-body { padding: 20px 14px; }
  .lab-scene-heading { display: block; }
  .lab-scene-heading > :last-child { display: block; margin-top: 4px; }
  .lab-bucket { column-gap: 10px; padding: 10px; grid-template-columns: 28px minmax(0, 1fr); }
  .lab-slots { gap: 8px; }
  .lab-slot:not(:last-child)::after { width: 5px; right: -7px; }
  .hash-node { font-size: 16px; }
  .lab-binary-row { grid-template-columns: 62px minmax(0, 1fr); gap: 4px; }
  .lab-bits { gap: 2px; font-size: 14px; }
  .lab-binary-label { font-size: 11px; }
  .lab-controls { display: grid; grid-template-columns: 1fr 1fr; }
  .lab-controls .lab-change { margin-left: 0; }
  .lab-array-heading > span { font-size: 10px; }
}