:root {
  --lab-bg: #031225;
  --lab-panel: #061b35;
  --lab-rule: rgba(151, 199, 235, 0.22);
  --lab-text: #f7fbff;
  --lab-muted: #9ab1c7;
  --lab-cyan: #65dff7;
  --lab-amber: #ffb66d;
}

.wrap-wide {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 22px;
}

.lab-page {
  background: #edf3f9;
}

.lab-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 68px 0 88px;
}

.lab-intro {
  max-width: 820px;
  margin-bottom: 32px;
}

.lab-kicker {
  margin: 0 0 10px;
  color: #0b6ff2;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.lab-intro h1 {
  margin-bottom: 18px;
  font-size: clamp(2.2rem, 5vw, 4.8rem);
  letter-spacing: -0.035em;
  text-transform: none;
}

.lab-intro > p:last-child {
  max-width: 720px;
  margin: 0;
  color: #324761;
  font-size: 1.12rem;
}

.instrument {
  overflow: hidden;
  border: 1px solid #0c2f55;
  border-radius: 4px;
  background: var(--lab-bg);
  box-shadow: 0 26px 70px rgba(6, 29, 58, 0.18);
  color: var(--lab-text);
  font-family: var(--font-sans);
}

.instrument-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--lab-rule);
}

.instrument-bar > div {
  min-width: 0;
  padding: 15px 20px;
  border-right: 1px solid var(--lab-rule);
}

.instrument-bar > div:last-child {
  border-right: 0;
}

.instrument-label {
  display: block;
  margin-bottom: 3px;
  color: var(--lab-muted);
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.instrument-bar strong {
  font-size: 0.85rem;
  letter-spacing: 0.035em;
}

.layer-strip {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 22px;
  align-items: center;
  padding: 11px 18px;
  border-bottom: 1px solid var(--lab-rule);
  background: rgba(2, 12, 27, 0.72);
}

.layer-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.layer-toggles legend {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.layer-toggles label,
.color-controls label {
  color: var(--lab-muted);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.layer-toggles label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.layer-toggles input { accent-color: var(--lab-cyan); }

.color-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 12px;
}

.color-controls label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.color-controls select {
  min-height: 26px;
  border: 1px solid var(--lab-rule);
  border-radius: 2px;
  background: #06172d;
  color: var(--lab-text);
  font: 600 0.67rem/1 var(--font-sans);
}

.color-controls input[type="color"] {
  width: 28px;
  height: 26px;
  padding: 2px;
  border: 1px solid var(--lab-rule);
  border-radius: 2px;
  background: #06172d;
  cursor: pointer;
}

.layer-strip :focus-visible {
  outline: 2px solid var(--lab-cyan);
  outline-offset: 2px;
}

.canvas-wrap {
  position: relative;
}

#flow-canvas {
  display: block;
  width: 100%;
  height: clamp(330px, 49vw, 570px);
}

.flow-legend {
  position: absolute;
  right: 18px;
  bottom: 15px;
  display: grid;
  grid-template-columns: minmax(250px, 1fr) auto;
  gap: 18px;
  min-width: min(540px, calc(100% - 36px));
  padding: 11px 13px;
  border: 1px solid var(--lab-rule);
  background: rgba(2, 12, 27, 0.9);
  color: var(--lab-muted);
  font-size: 0.66rem;
  letter-spacing: 0.025em;
  backdrop-filter: blur(8px);
}

.legend-title {
  display: block;
  margin-bottom: 6px;
  color: #f7fbff;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.cp-key,
.vector-key { min-width: 0; }

.cp-ramp {
  display: block;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, #123cff 0%, #00b9ff 27%, #36ef9a 49%, #ffe34d 72%, #ff3b24 100%);
}

.cp-ticks {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 5px;
}

.cp-ticks b { font-weight: 500; }

.vector-key > span:not(.legend-title) {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}

.vector-key i {
  display: inline-block;
  height: 1px;
  background: #f7fbff;
}

.vector-half { width: 10px; }
.vector-one { width: 20px; }
.vector-high { width: 30px; }

.flow-legend sub {
  font-size: 0.75em;
}

.flow-legend span {
  display: flex;
  align-items: center;
}

.instrument-console {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  border-top: 1px solid var(--lab-rule);
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  align-items: end;
  padding: 24px;
  border-right: 1px solid var(--lab-rule);
}

.control > span {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
  font-size: 0.78rem;
}

.control output {
  color: var(--lab-cyan);
  font-variant-numeric: tabular-nums;
}

.control small {
  display: block;
  margin-top: 9px;
  color: var(--lab-muted);
  font-size: 0.68rem;
  line-height: 1.35;
}

.control input[type="range"] {
  width: 100%;
  accent-color: var(--lab-cyan);
}

.control input[type="range"]:focus-visible {
  outline: 2px solid var(--lab-cyan);
  outline-offset: 5px;
}

.lab-button {
  grid-column: 1 / -1;
  min-height: 38px;
  border: 1px solid rgba(101, 223, 247, 0.55);
  border-radius: 3px;
  background: transparent;
  color: var(--lab-text);
  font: 700 0.72rem/1 var(--font-sans);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.lab-button:hover {
  background: rgba(101, 223, 247, 0.1);
}

.readouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
}

.readouts > div {
  padding: 23px 18px;
  border-right: 1px solid var(--lab-rule);
}

.readouts > div:last-child { border-right: 0; }

.readouts dt {
  margin-bottom: 8px;
  color: var(--lab-muted);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.readouts dd {
  margin: 0;
  color: var(--lab-text);
  font-size: clamp(1rem, 1.7vw, 1.35rem);
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

.model-note {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 68px;
  padding: 72px 0 0;
}

.model-note h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  line-height: 1.15;
}

.model-copy p {
  margin: 0 0 18px;
}

.source-line {
  font-family: var(--font-sans);
  font-size: 0.83rem;
}

.lab-footer .footer-inner {
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

@media (max-width: 980px) {
  .instrument-console,
  .model-note {
    grid-template-columns: 1fr;
  }

  .controls {
    border-right: 0;
    border-bottom: 1px solid var(--lab-rule);
  }

  .model-note { gap: 24px; }

  .layer-strip { grid-template-columns: 1fr; }
  .color-controls { justify-content: flex-start; }
}

@media (max-width: 680px) {
  .wrap-wide,
  .lab-shell { width: min(100% - 28px, 1180px); }

  .lab-shell { padding: 44px 0 64px; }

  .instrument-bar { grid-template-columns: 1fr 1fr; }
  .instrument-bar > div:nth-child(2) { border-right: 0; }
  .instrument-bar > div:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid var(--lab-rule);
  }

  #flow-canvas { height: 360px; }

  .layer-strip { padding: 12px; }
  .layer-toggles { display: grid; grid-template-columns: 1fr 1fr; }
  .color-controls { display: grid; grid-template-columns: 1fr 1fr; }
  .color-controls label { justify-content: space-between; }

  .flow-legend {
    position: static;
    grid-template-columns: 1fr;
    min-width: 0;
    margin: 0 8px 10px;
    gap: 9px;
  }

  .controls { grid-template-columns: 1fr; }
  .lab-button { width: 100%; }
  .readouts { grid-template-columns: 1fr; }
  .readouts > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    border-right: 0;
    border-bottom: 1px solid var(--lab-rule);
  }
  .readouts > div:last-child { border-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .flow-legend { backdrop-filter: none; }
}