/* Follow the Heat. Every selector is scoped to the activity root. */
.lab-follow-the-heat .fth{container-type:inline-size;--fth-pad:clamp(14px,2.5cqi,24px);--fth-sans:var(--ed-sans,var(--sans,Inter,Arial,sans-serif));--fth-serif:var(--ed-display,var(--display,Georgia,serif));--fth-ease:cubic-bezier(.2,.7,.2,1)}

/* ---------- The instrument panel: the publication's subject colours on Night ---------- */
.lab-follow-the-heat .fth-instrument{
  --n-bg:var(--ed-night-2,#16222A);--n-deep:var(--ed-night,#0D1418);--n-paper:var(--ed-paper,#F7F4EE);
  --n-text:#D3D8D5;--n-muted:var(--ed-muted-on-night,#A9B0AE);--n-line:#7A8283;--n-faint:rgba(247,244,238,.13);
  --n-heat:var(--ed-heat-on-night,#F08A6E);--n-water:var(--ed-water-on-night,#7CC3C6);--n-power:var(--ed-power-on-night,#E3B860);
  --n-facility:#3F8F99;--n-facility-text:#8CC7CE;--n-air:#A9B3A2;--n-box:#1B2932;
  --lab-focus:var(--n-paper);color-scheme:dark;
  position:relative;color:var(--n-text);background-color:var(--n-bg);border-radius:4px;padding:0 var(--fth-pad) 8px;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);background-size:32px 32px
}
.lab-follow-the-heat .fth-instrument ::selection{background:rgba(240,138,110,.35);color:var(--n-paper)}

/* ---------- Stage: the route of stops, the text, the scene ---------- */
.lab-follow-the-heat .fth-stage{padding:0;background:transparent;border:0}
.lab-follow-the-heat .fth-steps{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:0;margin:0;padding:16px 0 12px;list-style:none;border-bottom:1px solid var(--n-faint)}
.lab-follow-the-heat .fth-steps li{position:relative;display:flex;min-width:0}
/* The route between stops: a hairline, drawn in heat as far as the current stage. */
.lab-follow-the-heat .fth-steps li+li::before{content:"";position:absolute;top:24px;left:calc(-50% + 19px);right:calc(50% + 19px);height:1px;background:var(--n-line)}
.lab-follow-the-heat .fth-steps li.is-reached::before{height:2px;top:23.5px;background:var(--n-heat)}
.lab-follow-the-heat .fth-steps button{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;min-width:0;min-height:62px;padding:8px 2px 6px;margin:0;border:0;border-radius:4px;background:transparent;color:var(--n-muted);font:500 13px/1.25 var(--fth-sans);text-align:center;cursor:pointer}
.lab-follow-the-heat .fth-steps button:hover{color:var(--n-paper);background:rgba(247,244,238,.05)}
.lab-follow-the-heat .fth-steps button:focus-visible{outline-offset:-2px}
.lab-follow-the-heat .fth-step-n{flex:none;display:grid;place-items:center;width:30px;height:30px;border:1.5px solid var(--n-line);border-radius:50%;background:var(--n-bg);color:var(--n-text);font:600 13px/1 var(--fth-sans);font-variant-numeric:tabular-nums}
.lab-follow-the-heat .fth-steps li.is-reached .fth-step-n{border-color:var(--n-heat)}
.lab-follow-the-heat .fth-steps button:hover .fth-step-n{border-color:var(--n-paper)}
.lab-follow-the-heat .fth-steps button[aria-current=step]{color:var(--n-paper);font-weight:650;background:transparent}
.lab-follow-the-heat .fth-steps button[aria-current=step] .fth-step-n{background:var(--n-heat);border-color:var(--n-heat);color:var(--n-deep);font-weight:700}

.lab-follow-the-heat .fth-body{padding:22px 0 0}
.lab-follow-the-heat .fth-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 16px;margin:0 0 12px}
.lab-follow-the-heat .fth-head .lab-step-count{margin:0;font-size:13px;color:var(--n-muted)}
.lab-follow-the-heat .fth-head .lab-step-nav{margin:0;flex-wrap:nowrap;gap:8px}
.lab-follow-the-heat .fth-text{max-width:none}
.lab-follow-the-heat .fth-text h3{font:400 clamp(26px,3vw,34px)/1.1 var(--fth-serif);letter-spacing:-.015em;color:var(--n-paper);margin:0 0 12px}
.lab-follow-the-heat .fth-copy{display:grid;max-width:66ch;color:var(--n-text)}
.lab-follow-the-heat .fth-copy-item{grid-area:1/1;min-width:0}
.lab-follow-the-heat .fth-copy-item.is-sizer{visibility:hidden}
.lab-follow-the-heat .fth-copy-item.is-other{display:none}
.lab-follow-the-heat .fth-copy p{margin:0 0 10px}
.lab-follow-the-heat .fth-copy p:last-child{margin-bottom:0}
.lab-follow-the-heat .fth-subhead{font-weight:650;color:var(--n-paper)}
.lab-follow-the-heat .fth-eq{font-variant-numeric:tabular-nums;padding:9px 14px;color:var(--n-paper);background:rgba(247,244,238,.06);border-left:2px solid var(--n-heat)}
.lab-follow-the-heat .fth-note{font-size:15px;color:var(--n-muted)}
.lab-follow-the-heat .fth-prompt{font-size:15px;font-weight:600;color:var(--n-paper)}

/* Buttons on the panel: quiet outline, and a light primary. */
.lab-follow-the-heat .fth-instrument .lab-button{min-width:88px;padding:10px 20px;text-align:center;color:var(--n-paper);background:transparent;border:1px solid rgba(247,244,238,.42);border-radius:999px}
.lab-follow-the-heat .fth-instrument .lab-button:hover{background:rgba(247,244,238,.1)}
.lab-follow-the-heat .fth-instrument .lab-button.is-primary{color:var(--n-deep);background:var(--n-paper);border-color:var(--n-paper)}
.lab-follow-the-heat .fth-instrument .lab-button.is-primary:hover{background:#fff}
.lab-follow-the-heat .fth-instrument .lab-button[aria-disabled=true]{opacity:.38;cursor:not-allowed}
.lab-follow-the-heat .fth-instrument .lab-button[aria-disabled=true]:hover{background:transparent}

.lab-follow-the-heat .fth-figure{margin:22px 0 0;display:flex;flex-direction:column}
/* The caption is first in the markup (a figure caption must be first or last); it shows last. */
.lab-follow-the-heat .fth-figure>.fth-svg{order:1}
.lab-follow-the-heat .fth-figure>.fth-under{order:2}
.lab-follow-the-heat .fth-figure>.fth-key{order:3}
.lab-follow-the-heat .fth-under{display:none;justify-content:flex-end;gap:8px;margin:16px 0 0;flex-wrap:nowrap}
.lab-follow-the-heat .fth-svg{display:block;width:100%;height:auto;overflow:visible;--fth-ts:1;overflow-anchor:none}
.lab-follow-the-heat .fth-wide{display:none}
.lab-follow-the-heat .fth-tall{max-width:420px;margin:0 auto}
.lab-follow-the-heat .fth-key{margin:14px 0 22px;max-width:96ch;font-size:13px;line-height:1.5;color:var(--n-muted)}

/* ---------- The scene ---------- */
.lab-follow-the-heat .fth-svg text{font-family:var(--fth-sans);fill:var(--n-text)}
.lab-follow-the-heat .fth-roof{stroke:var(--n-line);stroke-width:1.25}
.lab-follow-the-heat .fth-svg .fth-zone{font-size:calc(13px * var(--fth-ts));font-weight:600;letter-spacing:.09em;text-transform:uppercase;fill:var(--n-muted)}
.lab-follow-the-heat .fth-rack{fill:rgba(247,244,238,.03);stroke:var(--n-line);stroke-width:1.25}
.lab-follow-the-heat .fth-scalebar{stroke:var(--n-line)}
.lab-follow-the-heat .fth-svg .fth-scale-note{fill:var(--n-muted)}
.lab-follow-the-heat .fth-svg [data-stage]{cursor:pointer}
/* Stages that are not current fade toward the panel. Plain colours first; where color-mix() exists each
   colour is mixed toward Night (opaque, so overlaps never show); elsewhere the shapes fade with opacity. */
.lab-follow-the-heat .fth-group{--k:100%}
.lab-follow-the-heat .fth-group.is-dim{--k:30%}
.lab-follow-the-heat .fth-band{fill:none;stroke-linecap:butt;stroke-linejoin:round;stroke:var(--c)}
.lab-follow-the-heat .fth-band.is-power{--c:var(--n-power)}
.lab-follow-the-heat .fth-band.is-heat{--c:var(--n-heat)}
.lab-follow-the-heat .fth-band.is-tech{--c:var(--n-water)}
.lab-follow-the-heat .fth-band.is-facility{--c:var(--n-facility)}
.lab-follow-the-heat .fth-band.is-air{--c:var(--n-air)}
.lab-follow-the-heat .fth-return path{fill:none;stroke-width:1.5;stroke:var(--c)}
.lab-follow-the-heat .fth-return polygon{fill:var(--c)}
.lab-follow-the-heat .fth-return.is-tech{--c:var(--n-water)}
.lab-follow-the-heat .fth-return.is-facility{--c:var(--n-facility-text)}
.lab-follow-the-heat .fth-return.is-air{--c:var(--n-air)}
.lab-follow-the-heat .fth-box{fill:var(--n-box);stroke:var(--n-line);stroke-width:1.25}
.lab-follow-the-heat .fth-box.fth-cdu{fill:#1E3A40}
.lab-follow-the-heat .fth-plates{fill:none;stroke:var(--n-water);stroke-width:1}
.lab-follow-the-heat .fth-chip{fill:var(--n-heat)}
.lab-follow-the-heat .fth-plate{fill:#22454B;stroke:var(--n-water);stroke-width:1.25}
.lab-follow-the-heat .fth-vapour{fill:none;stroke:var(--n-water);stroke-width:1.6;stroke-linecap:round}
.lab-follow-the-heat .fth-group.is-dim .fth-exit{opacity:.3}
/* A control being pointed at or focused brightens the parts it changes, and their numbers. */
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-group.is-dim[data-stage="1"],
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-group.is-dim[data-stage="2"],
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-group.is-dim[data-stage="4"],
.lab-follow-the-heat .fth-instrument[data-link=rise] .fth-group.is-dim[data-stage="2"],
.lab-follow-the-heat .fth-instrument[data-link=route] .fth-group.is-dim[data-stage="5"],
.lab-follow-the-heat .fth-instrument[data-link=route] .fth-group.is-dim[data-stage="6"]{--k:70%}
.lab-follow-the-heat .fth-instrument[data-link=route] .fth-group.is-dim[data-stage="6"] .fth-exit{opacity:.7}
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-badge[data-stage="1"] circle,
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-badge[data-stage="2"] circle,
.lab-follow-the-heat .fth-instrument[data-link=capture] .fth-badge[data-stage="4"] circle,
.lab-follow-the-heat .fth-instrument[data-link=rise] .fth-badge[data-stage="2"] circle,
.lab-follow-the-heat .fth-instrument[data-link=route] .fth-badge[data-stage="5"] circle,
.lab-follow-the-heat .fth-instrument[data-link=route] .fth-badge[data-stage="6"] circle{stroke:var(--n-heat);stroke-width:1.75}
.lab-follow-the-heat .fth-stop{stop-color:var(--n-heat)}
.lab-follow-the-heat .fth-marks{fill:none;stroke:var(--n-bg);stroke-width:2.25;stroke-linecap:round;stroke-linejoin:round}
@supports not (color:color-mix(in srgb,red 50%,blue)){
  .lab-follow-the-heat .fth-group.is-dim>:not(text){opacity:.32}
}
@supports (color:color-mix(in srgb,red 50%,blue)){
  .lab-follow-the-heat .fth-band{stroke:color-mix(in srgb,var(--c) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-return path{stroke:color-mix(in srgb,var(--c) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-return polygon{fill:color-mix(in srgb,var(--c) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-box{stroke:color-mix(in srgb,var(--n-line) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-plates{stroke:color-mix(in srgb,var(--n-water) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-chip{fill:color-mix(in srgb,var(--n-heat) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-plate{stroke:color-mix(in srgb,var(--n-water) var(--k,100%),var(--n-bg))}
  .lab-follow-the-heat .fth-vapour{stroke:color-mix(in srgb,var(--n-water) var(--k,100%),var(--n-bg))}
}
.lab-follow-the-heat .fth-svg .fth-chip-label{fill:var(--n-deep);font-size:calc(13px * var(--fth-ts));font-weight:700}
.lab-follow-the-heat .fth-svg .fth-plate-label{fill:var(--n-water);font-size:calc(13px * var(--fth-ts));font-weight:650}
.lab-follow-the-heat .fth-svg .fth-name{font-size:calc(13.5px * var(--fth-ts));font-weight:600;fill:var(--n-paper)}
.lab-follow-the-heat .fth-svg .fth-value{font-family:var(--fth-serif);font-size:calc(19px * var(--fth-ts));fill:var(--n-paper)}
.lab-follow-the-heat .fth-svg .fth-small{font-size:calc(13px * var(--fth-ts));fill:var(--n-text)}
.lab-follow-the-heat .fth-svg .fth-unit{font-family:var(--fth-sans);font-size:calc(13px * var(--fth-ts))}
.lab-follow-the-heat .fth-svg .fth-strong{font-weight:700}
.lab-follow-the-heat .fth-wide .fth-name{font-size:calc(14px * var(--fth-ts))}
.lab-follow-the-heat .fth-wide .fth-value{font-size:calc(21px * var(--fth-ts))}
.lab-follow-the-heat .fth-wide .fth-small{font-size:calc(13.5px * var(--fth-ts))}
.lab-follow-the-heat .fth-svg text.is-tech{fill:var(--n-water)}
.lab-follow-the-heat .fth-svg text.is-facility{fill:var(--n-facility-text)}
.lab-follow-the-heat .fth-svg text.is-air{fill:var(--n-air)}
.lab-follow-the-heat .fth-svg text.is-heat{fill:var(--n-heat)}
.lab-follow-the-heat .fth-svg text.is-power{fill:var(--n-power)}
.lab-follow-the-heat .fth-svg text.is-water{fill:var(--n-water)}
.lab-follow-the-heat .fth-svg text.fth-quiet{fill:var(--n-muted)}
.lab-follow-the-heat .fth-svg .fth-group.is-dim text{fill:var(--n-muted)}
.lab-follow-the-heat .fth-svg .fth-group.is-dim .fth-chip-label{fill:var(--n-paper)}
.lab-follow-the-heat .fth-badge circle{fill:var(--n-bg);stroke:var(--n-line);stroke-width:1.25}
.lab-follow-the-heat .fth-svg .fth-badge text{font-size:calc(13px * var(--fth-ts));font-weight:650;font-variant-numeric:tabular-nums;fill:var(--n-muted)}
/* The spotlight behind the current stage, and its number. */
.lab-follow-the-heat .fth-spot,.lab-follow-the-heat .fth-marker{pointer-events:none}
.lab-follow-the-heat .fth-spot{fill:rgba(247,244,238,.055);stroke:rgba(240,138,110,.5);stroke-width:1}
.lab-follow-the-heat .fth-marker circle{fill:var(--n-heat);stroke:var(--n-bg);stroke-width:2.5}
.lab-follow-the-heat .fth-svg .fth-marker-n{fill:var(--n-deep);font-size:calc(14px * var(--fth-ts));font-weight:700;font-variant-numeric:tabular-nums}
.lab-follow-the-heat .is-live .fth-marker{transition:transform .28s var(--fth-ease)}
.lab-follow-the-heat .is-live .fth-spot{transition:x .28s var(--fth-ease),y .28s var(--fth-ease),width .28s var(--fth-ease),height .28s var(--fth-ease)}
.lab-follow-the-heat .is-live .fth-spot.is-still,.lab-follow-the-heat .is-live .fth-marker.is-still{transition:none}

/* ---------- Controls: under the parts of the scene they change ---------- */
.lab-follow-the-heat .fth-controls{display:grid;grid-template-columns:minmax(0,1fr);gap:0;align-items:stretch;margin:0}
.lab-follow-the-heat .fth-control{min-width:0;margin:0;padding:16px 0 22px;border-top:1px solid var(--n-faint);box-shadow:inset 0 1px 0 transparent}
.lab-follow-the-heat .fth-control.is-current{border-top-color:var(--n-heat);box-shadow:inset 0 1px 0 var(--n-heat)}
.lab-follow-the-heat .lab-range.fth-control{display:grid;gap:4px;align-content:start;min-width:0;flex:none}
.lab-follow-the-heat .fth-token{flex:none;display:inline-grid;place-items:center;width:24px;height:24px;border:1.25px solid var(--n-line);border-radius:50%;font:650 13px/1 var(--fth-sans);color:var(--n-muted);font-variant-numeric:tabular-nums;align-self:center}
.lab-follow-the-heat .fth-control.is-current .fth-token{background:var(--n-heat);border-color:var(--n-heat);color:var(--n-deep)}
.lab-follow-the-heat .lab-range label{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;min-height:32px;font-size:14px;font-weight:600;color:var(--n-paper);justify-content:flex-start}
.lab-follow-the-heat .fth-control-name{flex:1 1 0;min-width:0;line-height:1.3}
.lab-follow-the-heat .lab-range output{flex:none;margin-left:auto;white-space:nowrap;font-weight:400;color:var(--n-paper)}
.lab-follow-the-heat .fth-out-n{font:400 24px/1 var(--fth-serif);font-variant-numeric:tabular-nums}
.lab-follow-the-heat .fth-out-u{font:500 13px/1 var(--fth-sans);color:var(--n-muted)}

/* Sliders: a thin track filled to the thumb. The capture track is the split itself. */
.lab-follow-the-heat .fth-range{-webkit-appearance:none;appearance:none;display:block;width:100%;height:44px;min-height:44px;margin:0;padding:0;background:transparent;cursor:pointer;--fth-at:50%}
.lab-follow-the-heat .fth-range::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:linear-gradient(to right,var(--n-paper) 0 var(--fth-at),rgba(247,244,238,.2) var(--fth-at) 100%)}
.lab-follow-the-heat .fth-range.is-split::-webkit-slider-runnable-track{height:8px;border-radius:4px;background:linear-gradient(to right,var(--n-water) 0 var(--fth-at),var(--n-air) var(--fth-at) 100%)}
.lab-follow-the-heat .fth-range::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px;height:24px;margin-top:-10px;border-radius:50%;background:var(--n-paper);border:3px solid var(--n-bg);box-shadow:0 0 0 1.5px var(--n-paper)}
.lab-follow-the-heat .fth-range.is-split::-webkit-slider-thumb{margin-top:-8px}
.lab-follow-the-heat .fth-range::-moz-range-track{height:4px;border-radius:2px;background:rgba(247,244,238,.2)}
.lab-follow-the-heat .fth-range::-moz-range-progress{height:4px;border-radius:2px;background:var(--n-paper)}
.lab-follow-the-heat .fth-range.is-split::-moz-range-track{height:8px;border-radius:4px;background:var(--n-air)}
.lab-follow-the-heat .fth-range.is-split::-moz-range-progress{height:8px;border-radius:4px;background:var(--n-water)}
.lab-follow-the-heat .fth-range::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--n-paper);border:3px solid var(--n-bg);box-shadow:0 0 0 1.5px var(--n-paper)}
.lab-follow-the-heat .fth-scale{position:relative;display:flex;justify-content:space-between;margin:0;min-height:20px;font-size:13px;line-height:1.5;color:var(--n-muted)}
/* The magazine's value on each slider: a 1 px tick at the thumb position, with the value beside it. */
.lab-follow-the-heat .fth-scale .fth-mark{position:absolute;top:0;left:calc(12px + (100% - 24px) * var(--at,.5));transform:translateX(-50%);white-space:nowrap}
.lab-follow-the-heat .fth-scale .fth-mark::before{content:"";position:absolute;top:-8px;left:50%;width:1px;height:6px;background:currentColor}
.lab-follow-the-heat .fth-mark.is-capture{--at:.8;transform:translateX(-100%)}
.lab-follow-the-heat .fth-scale .fth-mark.is-capture::before{left:auto;right:0}
.lab-follow-the-heat .fth-mark.is-rise{--at:.5}
.lab-follow-the-heat .fth-split{display:flex;justify-content:space-between;gap:12px;margin:2px 0 0;font-size:13px;line-height:1.4}
.lab-follow-the-heat .fth-split .is-tech{color:var(--n-water)}
.lab-follow-the-heat .fth-split .is-air{color:var(--n-air)}

.lab-follow-the-heat .fth-routes{border:0;border-top:1px solid var(--n-faint);min-width:0}
.lab-follow-the-heat .fth-routes.is-current{border-top-color:var(--n-heat)}
.lab-follow-the-heat .fth-routes legend{float:left;width:100%;display:flex;align-items:center;gap:10px;min-height:32px;margin:0 0 8px;padding:0;font-size:14px;font-weight:600;letter-spacing:0;color:var(--n-paper)}
.lab-follow-the-heat .fth-routes legend+*{clear:left}
.lab-follow-the-heat .fth-route{display:grid;grid-template-columns:18px minmax(0,1fr);gap:12px;align-items:start;min-height:44px;padding:9px 10px;margin:0 0 2px;border-radius:3px;cursor:pointer}
.lab-follow-the-heat .fth-route:hover{background:rgba(247,244,238,.05)}
.lab-follow-the-heat .fth-route:has(input:checked){background:rgba(247,244,238,.08);box-shadow:inset 2px 0 0 var(--n-heat)}
.lab-follow-the-heat .fth-route input{width:18px;height:18px;margin:2px 0 0;accent-color:var(--n-heat);cursor:pointer}
.lab-follow-the-heat .fth-route strong{display:block;font-size:15px;font-weight:600;line-height:1.3;color:var(--n-paper)}
.lab-follow-the-heat .fth-route small{display:block;margin-top:2px;font-size:14px;line-height:1.4;color:var(--n-muted)}

/* ---------- Readouts: an instrument cluster ---------- */
.lab-follow-the-heat .fth-readout{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px;margin:0;border-top:1px solid var(--n-faint)}
.lab-follow-the-heat .fth-readout>div{display:grid;grid-template-rows:1fr auto;min-width:0;padding:16px 0 14px;border-bottom:1px solid var(--n-faint)}
.lab-follow-the-heat .fth-readout dt{margin:0 0 6px;font-size:13px;font-weight:600;letter-spacing:.01em;color:var(--n-muted)}
.lab-follow-the-heat .fth-readout dd{margin:0;font:400 32px/1.05 var(--fth-serif);font-variant-numeric:tabular-nums;color:var(--n-paper)}
.lab-follow-the-heat .fth-readout dd small{margin-left:0;font:500 13px/1.3 var(--fth-sans);color:var(--n-muted);white-space:nowrap}
.lab-follow-the-heat .fth-readout .is-tech dd{color:var(--n-water)}
.lab-follow-the-heat .fth-readout .is-air dd{color:var(--n-air)}
.lab-follow-the-heat .fth-readout .is-heat dd{color:var(--n-heat)}
.lab-follow-the-heat .fth-readout .is-power dd{color:var(--n-power)}
.lab-follow-the-heat .fth-readout .is-water dd{color:var(--n-water)}
/* A qualifier (about, up to about) is a caption line over the number, so every value sits on one baseline. */
.lab-follow-the-heat .fth-pre{display:block;margin:0 0 3px;font:500 13px/1.3 var(--fth-sans);color:var(--n-muted)}
.lab-follow-the-heat .fth-v{display:block;min-height:34px}
/* A readout that does not apply on this route is a quiet phrase, not a big number. */
.lab-follow-the-heat .fth-readout .is-none .fth-v{font:500 15px/1.35 var(--fth-sans);color:var(--n-muted);padding-top:8px}
.lab-follow-the-heat .fth-gauge{position:relative;display:block;height:14px;margin:12px 0 0}
.lab-follow-the-heat .fth-gauge-track{position:absolute;left:0;right:0;top:6px;height:2px;background:rgba(247,244,238,.14)}
.lab-follow-the-heat .fth-tick{position:absolute;top:3px;width:1px;height:8px;margin-left:-.5px;background:rgba(247,244,238,.28)}
.lab-follow-the-heat .fth-tick.is-major{top:0;height:14px;background:var(--n-muted)}
.lab-follow-the-heat .fth-gauge-fill{position:absolute;top:4px;left:0;width:0;height:6px;transform:scaleX(0);transform-origin:left center}
.lab-follow-the-heat .fth-gauge-fill.is-tech{background:var(--n-water)}
.lab-follow-the-heat .fth-gauge-fill.is-air{background:var(--n-air)}
.lab-follow-the-heat .fth-gauge-fill.is-heat{background:var(--n-heat)}
.lab-follow-the-heat .fth-gauge-fill.is-power{background:var(--n-power)}
/* Tower water is an upper bound: an open, hatched fill. */
.lab-follow-the-heat .fth-gauge-fill.is-water{background:repeating-linear-gradient(135deg,var(--n-water) 0 1.5px,transparent 1.5px 5px);box-shadow:inset 0 0 0 1px var(--n-water)}
.lab-follow-the-heat .is-live .fth-gauge-fill{transition:transform .28s var(--fth-ease),width .28s var(--fth-ease),left .28s var(--fth-ease)}
/* One change cue, in words (not colour alone). Always laid out, shown only when the value changed. */
.lab-follow-the-heat .fth-changed{display:block;margin:8px 0 0;font:500 13px/1.2 var(--fth-sans);color:var(--n-heat);visibility:hidden}
.lab-follow-the-heat .is-changed .fth-changed{visibility:visible}
.lab-follow-the-heat .fth-gauge-note{margin:0;padding:12px 0 10px;font-size:13px;line-height:1.5;color:var(--n-muted);max-width:90ch}

/* ---------- Try this, reasoning and actions, on paper ---------- */
.lab-follow-the-heat .fth-try{border-top:0;margin:26px 0 0;padding-top:0}
.lab-follow-the-heat .fth-try summary{gap:12px;align-items:baseline;padding-top:10px;font-size:16px}
.lab-follow-the-heat .fth-try-state{font-size:13px;font-weight:500;color:var(--lab-muted);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.lab-follow-the-heat .fth-try ol{margin:4px 0 0;padding-left:22px}
.lab-follow-the-heat .fth-try li{margin:0 0 12px;max-width:66ch}
.lab-follow-the-heat .fth-try li::marker{font-variant-numeric:tabular-nums;color:var(--lab-muted)}
.lab-follow-the-heat .fth-answer{margin:8px 0 0;padding:10px 14px;font-size:15px;background:var(--lab-surface);border-left:3px solid var(--ed-water,var(--lab-tech))}
.lab-follow-the-heat .lab-actions .lab-button{border-radius:999px;padding:10px 20px;text-align:center}

/* ---------- Layouts by available width (container, not viewport) ---------- */
@container (max-width:759.98px){
  .lab-follow-the-heat .fth-step-name{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
  .lab-follow-the-heat .fth-steps button{min-height:48px;padding:7px 0}
  .lab-follow-the-heat .fth-steps li+li::before{top:22px}
  .lab-follow-the-heat .fth-steps li.is-reached::before{top:21.5px}
  /* The drawing sits below the text here: a second Back and Next under it. */
  .lab-follow-the-heat .fth-under{display:flex}
}
@container (max-width:339.98px){
  .lab-follow-the-heat .fth-steps{grid-template-columns:repeat(4,minmax(0,1fr));row-gap:4px}
  .lab-follow-the-heat .fth-steps li:nth-child(5)::before{display:none}
}
@container (max-width:599.98px){
  /* Keep the instrument aligned with the page gutter on a phone. */
  .lab-follow-the-heat .fth-instrument{margin:0;border-radius:4px}
  .lab-follow-the-heat .fth-text h3{font-size:27px}
}
@container (min-width:600px){
  .lab-follow-the-heat .fth-controls{grid-template-columns:minmax(0,1fr) minmax(0,1fr);column-gap:32px}
  .lab-follow-the-heat .fth-routes{grid-column:1/-1}
  .lab-follow-the-heat .fth-routes legend+*{clear:none}
  .lab-follow-the-heat .fth-routes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));column-gap:8px}
  .lab-follow-the-heat .fth-routes legend{float:none;grid-column:1/-1}
  .lab-follow-the-heat .fth-readout{grid-template-columns:repeat(3,minmax(0,1fr));column-gap:24px}
}
@container (min-width:760px) and (max-width:939.98px){
  .lab-follow-the-heat .fth-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,340px);gap:36px;align-items:start}
  .lab-follow-the-heat .fth-figure{margin:0 0 8px}
}
@container (min-width:940px){
  .lab-follow-the-heat .fth-wide{display:block}
  .lab-follow-the-heat .fth-tall{display:none}
  .lab-follow-the-heat .fth-text{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.85fr);grid-template-rows:auto auto 1fr;grid-template-areas:"count copy" "title copy" "nav copy";column-gap:48px;align-items:start}
  .lab-follow-the-heat .fth-copy-item.is-other{display:block}
  .lab-follow-the-heat .fth-head{display:contents}
  .lab-follow-the-heat .fth-head .lab-step-count{grid-area:count;margin:0 0 8px}
  .lab-follow-the-heat .fth-text h3{grid-area:title;margin:0 0 22px}
  .lab-follow-the-heat .fth-head .lab-step-nav{grid-area:nav}
  .lab-follow-the-heat .fth-copy{grid-area:copy;padding-top:2px}
  /* The three controls line up with the scene's three zones: rack, the two lanes, the roof. */
  .lab-follow-the-heat .fth-controls{grid-template-columns:minmax(0,300fr) minmax(0,340fr) minmax(0,320fr);column-gap:0}
  .lab-follow-the-heat .fth-control{padding-right:36px}
  .lab-follow-the-heat .fth-routes{grid-column:auto;display:block;padding-right:0}
  .lab-follow-the-heat .fth-routes legend{float:left}
  .lab-follow-the-heat .fth-routes legend+*{clear:left}
  .lab-follow-the-heat .fth-readout{grid-template-columns:repeat(6,minmax(0,1fr));column-gap:0}
  .lab-follow-the-heat .fth-readout>div{padding:18px 18px 16px;border-bottom:0}
  .lab-follow-the-heat .fth-readout>div:first-child{padding-left:0}
  .lab-follow-the-heat .fth-readout>div+div{border-left:1px solid var(--n-faint)}
}
/* The lower pair carries the stage name on the left, the buttons on the right. */
.lab-follow-the-heat .fth-under-label{margin:0 auto 0 0;align-self:center;font:600 14px/1.3 var(--ed-sans,Inter,Arial,sans-serif);color:var(--fth-muted,#C3C9C6);min-width:0}

/* Material, light and motion remain subordinate to the values and the path being read. */
.lab-follow-the-heat .fth-instrument{
  --n-bg:#15262d;--n-deep:#101d24;--n-box:#263e48;--n-text:#d6dfdf;--n-muted:#a8babd;
  --n-line:#789399;--n-heat:#eaa582;--n-water:#91d1ce;--n-facility:#4d9caa;--n-facility-text:#8fc7d2;--n-air:#bec7b3;--n-power:#e2c384;
  border:1px solid #30464d;border-radius:8px;background:#15262d;
  background-image:radial-gradient(ellipse at 15% 0%,#2d485045,transparent 62%),linear-gradient(135deg,#ffffff03,transparent 45%);
  box-shadow:0 18px 48px -32px #10232b80,inset 0 1px 0 #ffffff0a;padding-bottom:16px;
}
.lab-follow-the-heat .fth-steps{border-bottom-color:#78939933;padding-top:14px}
.lab-follow-the-heat .fth-steps li+li::before{background:#6e8a8f66}
.lab-follow-the-heat .fth-steps li.is-reached::before{background:#c68b70;height:1px;top:24px}
.lab-follow-the-heat .fth-steps button{font-size:12px;letter-spacing:.01em}
.lab-follow-the-heat .fth-step-n{width:28px;height:28px;border-width:1px;background:#15262d;font-size:12px}
.lab-follow-the-heat .fth-steps button[aria-current=step] .fth-step-n{box-shadow:0 0 0 4px #eaa58212,inset 0 1px 0 #ffffff30}
.lab-follow-the-heat .fth-body{padding-top:24px}
.lab-follow-the-heat .fth-text h3{font-size:clamp(28px,3vw,36px);line-height:1.12;letter-spacing:-.02em}
.lab-follow-the-heat .fth-head .lab-step-count{font-size:11px;letter-spacing:.08em;color:#a8babd}
.lab-follow-the-heat .fth-copy{font-size:15px;line-height:1.7}
.lab-follow-the-heat .fth-eq{background:#0c1c234d;border-left-color:#c78e73;border-radius:0 3px 3px 0;font-size:15px;padding:10px 14px}
.lab-follow-the-heat .fth-note{font-size:13px;line-height:1.65}
.lab-follow-the-heat .fth-prompt{font-size:14px;line-height:1.65}
.lab-follow-the-heat .fth-instrument .lab-button{border-radius:4px;border-color:#78939970;font-size:12px;min-height:44px;padding:10px 18px;transition:background .16s ease,border-color .16s ease}
.lab-follow-the-heat .fth-instrument .lab-button:hover{border-color:#a8babd;background:#a8babd12}
.lab-follow-the-heat .fth-instrument .lab-button.is-primary{background:#eee9dc;border-color:#eee9dc}
.lab-follow-the-heat .fth-instrument .lab-button.is-primary:hover{background:#fffaf0}
.lab-follow-the-heat .fth-figure{position:relative;margin-top:22px;border:1px solid #6e8a8f30;border-radius:6px;background:linear-gradient(160deg,#10232b,#11252d 55%,#142a31);overflow:clip}
.lab-follow-the-heat .fth-scene-tools{order:0;display:flex;align-items:center;gap:20px;min-height:53px;padding:5px 16px;border-bottom:1px solid #78939926;background:#14272e;position:sticky;top:72px;z-index:4}
.lab-follow-the-heat .fth-scene-title{font:600 11px/1.4 var(--fth-sans);letter-spacing:.07em;color:#c5d4d6;text-transform:uppercase}
.lab-follow-the-heat .fth-scene-key{display:flex;align-items:center;gap:14px;font:400 10px/1.4 var(--fth-sans);color:var(--n-muted)}
.lab-follow-the-heat .fth-scene-key span{display:inline-flex;align-items:center;gap:6px}
.lab-follow-the-heat .fth-scene-key span::before{content:'';display:block;width:13px;height:2px;background:currentColor;border-radius:1px}
.lab-follow-the-heat .fth-scene-key .is-tech{color:var(--n-water)}
.lab-follow-the-heat .fth-scene-key .is-air{color:var(--n-air)}
.lab-follow-the-heat .fth-scene-key .is-power{color:var(--n-power)}
.lab-follow-the-heat .fth-motion{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;min-width:100px;padding:6px 9px;border:0;border-radius:3px;background:transparent;color:#c6d8da;font:500 11px/1.4 var(--fth-sans);cursor:pointer}
.lab-follow-the-heat .fth-motion:hover{background:#a8babd12;color:#f4f1e8}
.lab-follow-the-heat .fth-motion:focus-visible{outline:2px solid #eee9dc;outline-offset:-2px}
.lab-follow-the-heat .fth-motion:disabled{opacity:.6;cursor:default}
.lab-follow-the-heat .fth-motion-icon{display:block;width:9px;height:10px;border-inline:2px solid currentColor}
.lab-follow-the-heat .is-motion-paused .fth-motion-icon{width:0;height:0;border:5px solid transparent;border-right:0;border-left:7px solid currentColor}
.lab-follow-the-heat .fth-key{font-size:11px;line-height:1.7;max-width:none;border-top:1px solid #78939926;margin:0;padding:14px 16px 16px;background:#0a1c2226}
.lab-follow-the-heat .fth-under{padding:0 14px 14px;margin-top:8px}
.lab-follow-the-heat .fth-under-label{font-size:12px;line-height:1.5;color:#b4c6c9}
.lab-follow-the-heat .fth-scene-grid{fill:none;stroke:#6c929d;stroke-opacity:.075;stroke-width:.6}
.lab-follow-the-heat .fth-roof{stroke:#789399;stroke-opacity:.4;stroke-width:1;stroke-dasharray:4 6}
.lab-follow-the-heat .fth-group.is-dim{--k:56%}
.lab-follow-the-heat .fth-rack{fill:none;stroke:#8ba5ad80;stroke-width:1}
.lab-follow-the-heat .fth-rack-surface{fill:var(--fth-rack-fill,#203a44);stroke:#99adb326;stroke-width:1}
.lab-follow-the-heat .fth-rack-post{fill:#071b23;stroke:#91aab526;stroke-width:.7}
.lab-follow-the-heat .fth-server{fill:var(--fth-metal-fill,#2b414b);stroke:#a9c0c530;stroke-width:.6}
.lab-follow-the-heat .fth-server-slot{stroke:#0a2028;stroke-width:1.1;stroke-linecap:round}
.lab-follow-the-heat .fth-server-light{fill:#8dc9c0;opacity:.65}
.lab-follow-the-heat .fth-box{fill:var(--fth-metal-fill,#263e48);stroke:#a2bbc0;stroke-width:.9}
.lab-follow-the-heat .fth-box.fth-cdu{fill:var(--fth-plate-fill,#315e64);stroke:#91d1ce}
.lab-follow-the-heat .fth-plates{stroke:#bde5e0;stroke-width:1;opacity:.75}
.lab-follow-the-heat .fth-chip{fill:var(--fth-chip-fill,#ce8064);stroke:#f0b99c;stroke-width:.6}
.lab-follow-the-heat .fth-chip-die{fill:none;stroke:#5f382666;stroke-width:.7}
.lab-follow-the-heat .fth-chip-pin{fill:none;stroke:#d6b391;stroke-width:2;stroke-linecap:round}
.lab-follow-the-heat .fth-plate{fill:var(--fth-plate-fill,#315e64);stroke:#9ed3cf;stroke-width:.9}
.lab-follow-the-heat .fth-plate-channel{fill:none;stroke:#bee7df;stroke-width:.6;opacity:.22}
.lab-follow-the-heat .fth-cooler-fin{fill:none;stroke:#9cb8bd;stroke-width:.55;opacity:.19}
.lab-follow-the-heat .fth-equipment-foot{fill:#0a1c24;stroke:#6f8b94;stroke-width:.6}
.lab-follow-the-heat .fth-edge-light{fill:none;stroke:#e0f1ee;stroke-opacity:.27;stroke-width:.65}
.lab-follow-the-heat .fth-edge-shade{fill:none;stroke:#061921;stroke-opacity:.7;stroke-width:1.6}
.lab-follow-the-heat .fth-fan-ring{fill:#0d242c;stroke:#849da4;stroke-width:.65}
.lab-follow-the-heat .fth-fan-blade{fill:#8da6ab;opacity:.75}
.lab-follow-the-heat .fth-fan-hub{fill:#bfd0cf}
.lab-follow-the-heat .fth-stream{fill:none;stroke:#edf7ef;stroke-dasharray:12 108;stroke-linecap:round;opacity:.65;pointer-events:none}
.lab-follow-the-heat .fth-return path{stroke-width:1.1;stroke-opacity:.8}
.lab-follow-the-heat .fth-return polygon{opacity:.8}
.lab-follow-the-heat .fth-group.is-dim .fth-equipment-detail{opacity:.55}
.lab-follow-the-heat .fth-group.is-dim .fth-box,.lab-follow-the-heat .fth-group.is-dim .fth-chip,.lab-follow-the-heat .fth-group.is-dim .fth-plate{opacity:.8}
.lab-follow-the-heat .fth-svg .fth-value{font-variant-numeric:tabular-nums;letter-spacing:-.015em}
.lab-follow-the-heat .fth-svg .fth-chip-label{fill:#17252a;font-size:calc(13px * var(--fth-ts));font-weight:750}
.lab-follow-the-heat .fth-svg .fth-plate-label{fill:#d7f2eb;font-size:calc(13px * var(--fth-ts))}
.lab-follow-the-heat .fth-svg .fth-group.is-dim .fth-chip-label{fill:#15262d}
.lab-follow-the-heat .fth-spot{fill:#a9d9d907;stroke:#91b9bb3d;stroke-width:.8}
.lab-follow-the-heat .fth-marker circle{fill:#eaa582;stroke:#15262d;stroke-width:3}
.lab-follow-the-heat .fth-badge circle{fill:#152a32;stroke:#77999f;stroke-width:.8}
.lab-follow-the-heat .fth-controls{gap:12px;padding-top:20px;margin-top:16px;border-top:1px solid #78939926}
.lab-follow-the-heat .fth-control{padding:18px 16px;border:1px solid #78939926;border-radius:5px;background:linear-gradient(140deg,#ffffff04,transparent 60%)}
.lab-follow-the-heat .fth-control.is-current{border-color:#c68b7090;box-shadow:inset 0 1px 0 #eaa58226}
.lab-follow-the-heat .fth-routes{border:1px solid #78939926}
.lab-follow-the-heat .fth-routes.is-current{border-color:#c68b7090}
.lab-follow-the-heat .lab-range label,.lab-follow-the-heat .fth-routes legend{font-size:12px;line-height:1.5}
.lab-follow-the-heat .fth-control-name{line-height:1.5}
.lab-follow-the-heat .fth-token{width:21px;height:21px;font-size:11px;border-width:1px}
.lab-follow-the-heat .fth-route{gap:10px;padding:10px 8px}
.lab-follow-the-heat .fth-route strong{font-size:13px;line-height:1.45}
.lab-follow-the-heat .fth-route small{font-size:12px;line-height:1.55}
.lab-follow-the-heat .fth-route:has(input:checked){background:#91b9bb0c;box-shadow:inset 2px 0 0 #91b9bb}
.lab-follow-the-heat .fth-readout{margin-top:16px;border:1px solid #78939926;border-radius:5px;background:#091c2326;gap:0 18px;padding-inline:14px}
.lab-follow-the-heat .fth-readout dt{font-size:11px;font-weight:500;line-height:1.5;letter-spacing:.015em}
.lab-follow-the-heat .fth-readout dd{font-size:31px;line-height:1.1}
.lab-follow-the-heat .fth-readout dd small{font-size:11px}
.lab-follow-the-heat .fth-readout .is-none .fth-v{font-size:13px;line-height:1.5}
.lab-follow-the-heat .fth-pre{font-size:11px}
.lab-follow-the-heat .fth-gauge-track{height:1px;background:#aac7ca30}
.lab-follow-the-heat .fth-gauge-fill{height:4px;top:5px}
.lab-follow-the-heat .fth-changed{font-size:10px;letter-spacing:.02em}
.lab-follow-the-heat .fth-gauge-note{font-size:11px;line-height:1.7;margin-top:6px;padding:10px 2px 0}
.lab-follow-the-heat .fth.is-motion-off *{transition:none!important}
.lab-follow-the-heat .is-motion-paused .fth-svg *{transition:none!important}
@container(max-width:599.98px){
  .lab-follow-the-heat .fth-instrument{border-radius:6px}
  .lab-follow-the-heat .fth-scene-tools{padding-inline:10px;gap:8px;min-height:50px}
  .lab-follow-the-heat .fth-scene-key{display:none}
  .lab-follow-the-heat .fth-scene-title{font-size:10px}
  .lab-follow-the-heat .fth-motion{font-size:11px;min-width:94px}
  .lab-follow-the-heat .fth-controls{gap:12px;padding-top:16px;margin-top:14px}
  .lab-follow-the-heat .fth-control{padding:16px 14px}
  .lab-follow-the-heat .fth-key{padding:12px}
  .lab-follow-the-heat .fth-copy{font-size:15px}
}
@container(min-width:940px){
  .lab-follow-the-heat .fth-controls{grid-template-columns:minmax(0,300fr) minmax(0,340fr) minmax(0,320fr);column-gap:12px}
  .lab-follow-the-heat .fth-readout{padding-inline:0;column-gap:0}
  .lab-follow-the-heat .fth-readout>div{padding:16px 12px}
  .lab-follow-the-heat .fth-readout>div:first-child{padding-left:14px}
  .lab-follow-the-heat .fth-readout>div+div{border-left-color:#78939926}
}
@container(max-width:339.98px){
  .lab-follow-the-heat .fth-under{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .lab-follow-the-heat .fth-under-label{grid-column:1/-1;font-size:12px;padding-top:4px}
  .lab-follow-the-heat .fth-under .lab-button{min-width:0;width:100%}
}

/* Named stops replace the former numbered rail. */
.lab-follow-the-heat .fth-steps button{justify-content:center;min-height:48px;gap:0}
.lab-follow-the-heat .fth-steps li::before{display:none}
.lab-follow-the-heat .fth-steps button[aria-current=step]{box-shadow:inset 0 -2px var(--n-heat)}
@container (max-width:759.98px){
 .lab-follow-the-heat .fth-steps{grid-template-columns:repeat(4,minmax(0,1fr));gap:4px 6px}
 .lab-follow-the-heat .fth-step-name{position:static;width:auto;height:auto;overflow:visible;clip:auto;white-space:normal;text-wrap:balance}
 .lab-follow-the-heat .fth-steps button{padding:7px 4px}
}