/* Four Kinds of Number: a sorting table. Paper figure cards on a dark instrument surface, a tray for each
   kind above them, then two explaining figures on paper.
   Each kind has a colour and a sign that differ in shape as well as hue:
   capacity, amber dashed outline; operating, a teal solid part of that outline; commitment, blue hatching;
   measured load, rust rising bars; a rate, an amber level line; a total, the teal area under it. */
.lab-four-kinds-of-number [hidden]{display:none!important}
.lab-four-kinds-of-number :is(input,button,[tabindex],.fk-option){scroll-margin-block:96px}
.lab-four-kinds-of-number :is(.fk-card,.fk-answer,.fk-controls){scroll-margin-block:16px}
.lab-four-kinds-of-number .fk.is-reduced *,.lab-four-kinds-of-number .fk.is-reduced *::before,.lab-four-kinds-of-number .fk.is-reduced *::after{transition:none!important;animation:none!important}

/* Colours on paper (all text-safe at 4.5:1 or better), and again on the dark table */
.lab-four-kinds-of-number .fk,.lab-four-kinds-of-number .fk-card,.lab-four-kinds-of-number .fk-token{
  --fk-paper:var(--ed-paper,#F7F4EE);--fk-ink:var(--ed-ink,#151C21);--fk-muted:var(--ed-muted,#5E625F);--fk-rule:var(--ed-line,#D7D2C7);--fk-fg:var(--ed-ink,#151C21);
  --fk-design:var(--ed-power,#86590C);--fk-design-tint:var(--ed-power-tint,#F1E2BF);
  --fk-operating:var(--ed-water,#1F6F78);--fk-operating-tint:var(--ed-water-tint,#CFE5E4);
  --fk-commitment:var(--ed-network,#2E4E8C);--fk-commitment-tint:var(--ed-network-tint,#D6DEEE);
  --fk-load:var(--ed-heat,#B4432C);--fk-load-tint:var(--ed-heat-tint,#F2D8CE);
  --fk-rate:var(--ed-power,#86590C);--fk-rate-tint:var(--ed-power-tint,#F1E2BF);
  --fk-total:var(--ed-water,#1F6F78);--fk-total-tint:var(--ed-water-tint,#CFE5E4)
}
.lab-four-kinds-of-number .fk-table{
  --fk-night:var(--ed-night-2,#16222A);--fk-on-night:var(--ed-paper,#F7F4EE);--fk-on-night-muted:var(--ed-muted-on-night,#A9B0AE);--fk-fg:var(--ed-paper,#F7F4EE);
  --fk-design:var(--ed-power-on-night,#E3B860);--fk-operating:var(--ed-water-on-night,#7CC3C6);
  --fk-commitment:var(--ed-network-on-night,#9DB4E8);--fk-load:var(--ed-heat-on-night,#F08A6E);
  --fk-rate:var(--ed-power-on-night,#E3B860);--fk-total:var(--ed-water-on-night,#7CC3C6)
}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=design]{--fk-k:var(--fk-design);--fk-kt:var(--fk-design-tint)}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=operating]{--fk-k:var(--fk-operating);--fk-kt:var(--fk-operating-tint)}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=commitment]{--fk-k:var(--fk-commitment);--fk-kt:var(--fk-commitment-tint)}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=load]{--fk-k:var(--fk-load);--fk-kt:var(--fk-load-tint)}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=rate]{--fk-k:var(--fk-rate);--fk-kt:var(--fk-rate-tint)}
.lab-four-kinds-of-number :is(.fk-card,.fk-tray,.fk-token,.fk-option)[data-kind=total]{--fk-k:var(--fk-total);--fk-kt:var(--fk-total-tint)}

/* Signs */
.lab-four-kinds-of-number .fk-glyph{flex:none;display:inline-block;width:32px;height:20px;overflow:visible;vertical-align:middle}
.lab-four-kinds-of-number .fk-g-outline{fill:none;stroke:var(--fk-design);stroke-width:1.7;stroke-dasharray:3.4 2.3}
.lab-four-kinds-of-number .fk-g-ghost{fill:none;stroke:var(--fk-fg);stroke-opacity:.42;stroke-width:1.2;stroke-dasharray:3 2.3}
.lab-four-kinds-of-number .fk-g-fill{fill:var(--fk-operating)}
.lab-four-kinds-of-number .fk-g-hatch{stroke:var(--fk-commitment);stroke-width:1.5}
.lab-four-kinds-of-number .fk-g-edge{stroke:var(--fk-commitment);stroke-width:2.2}
.lab-four-kinds-of-number .fk-g-bar{fill:var(--fk-load)}
.lab-four-kinds-of-number .fk-g-base{stroke:var(--fk-fg);stroke-opacity:.5;stroke-width:1}
.lab-four-kinds-of-number .fk-g-rate{stroke:var(--fk-rate);stroke-width:2.6}
.lab-four-kinds-of-number .fk-g-area{fill:var(--fk-total);fill-opacity:.55}

/* The table: the stage and its controls on the Lab's dark instrument surface, with a fine grid */
.lab-four-kinds-of-number .fk-table{background-color:var(--fk-night);background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:32px 32px;color:var(--fk-on-night);padding:clamp(18px,2.6vw,28px) clamp(16px,2.6vw,28px) 24px}
.lab-four-kinds-of-number .fk-table :focus-visible{outline:3px solid var(--fk-on-night);outline-offset:3px}
.lab-four-kinds-of-number .fk-stage{background:none;border:0;padding:0}
.lab-four-kinds-of-number .fk-head{margin:0}
.lab-four-kinds-of-number .fk-head .lab-step-count{font-size:13px;letter-spacing:.06em;color:var(--fk-operating);margin:0 0 8px}
.lab-four-kinds-of-number .fk-title{font-size:clamp(26px,2.8vw,34px);color:var(--fk-on-night)}

/* Trays: a kind's sign, name and meaning, and the figures filed in it */
.lab-four-kinds-of-number .fk-trays{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px 22px;margin:28px 0 30px;padding:0;border:0}
.lab-four-kinds-of-number .fk-trays.is-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.lab-four-kinds-of-number .fk-tray{display:flex;flex-direction:column;min-width:0;padding:0;border:0}
.lab-four-kinds-of-number .fk-tray-name{display:flex;align-items:center;gap:10px;margin:0;padding:12px 0 0;border-top:2px solid var(--fk-k);font:650 15px/1.3 var(--ed-sans,Inter,Arial,sans-serif);letter-spacing:0;color:var(--fk-on-night)}
.lab-four-kinds-of-number .fk-tray-def{margin:8px 0 12px;font:400 14px/1.45 var(--ed-sans,Inter,Arial,sans-serif);color:var(--fk-on-night-muted)}
.lab-four-kinds-of-number .fk-slot{display:flex;flex-wrap:wrap;align-content:flex-start;align-items:flex-start;gap:6px;margin:auto 0 0;min-height:54px;padding:7px;border:1px dashed rgba(247,244,238,.3);border-radius:4px;font:inherit;transition:border-color .15s ease,background-color .15s ease}
.lab-four-kinds-of-number .fk-tray.is-target .fk-slot{border-style:solid;border-color:var(--fk-k);background-color:rgba(247,244,238,.06)}
.lab-four-kinds-of-number .fk-none{font:400 14px/1.4 var(--ed-sans,Inter,Arial,sans-serif);color:var(--fk-on-night-muted);padding:7px 4px}
/* Trays in a row share their rows, so every slot starts on one line however long its meaning. */
@supports (grid-template-rows:subgrid){
  .lab-four-kinds-of-number .fk-tray{display:grid;grid-row:span 3;grid-template-rows:subgrid;row-gap:0}
  .lab-four-kinds-of-number .fk-slot{margin:0}
}
.lab-four-kinds-of-number .fk-token{position:relative;display:inline-block;max-width:100%;padding:6px 10px 6px 9px;background:var(--fk-paper);color:var(--fk-ink);border-left:3px solid var(--fk-k,var(--fk-rule));border-radius:2px;font:400 17px/1.15 var(--ed-display,Georgia,serif);font-variant-numeric:lining-nums;transition:background-color .2s ease}
.lab-four-kinds-of-number .fk-token:is([data-state=right],[data-state=shown]){background:var(--fk-kt)}
.lab-four-kinds-of-number .fk-token[data-state=retry]{background:transparent;color:var(--ed-muted-on-night,#A9B0AE);box-shadow:inset 0 0 0 1px rgba(247,244,238,.3);border-left-color:rgba(247,244,238,.3);text-decoration:line-through;text-decoration-thickness:1px}
.lab-four-kinds-of-number .fk-token.is-moving{z-index:5}

/* Cards: dated figures on paper, with a tear-off stub that holds the choice of tray */
.lab-four-kinds-of-number .fk-cards{list-style:none;margin:0;padding:0;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.lab-four-kinds-of-number .fk-cards.is-compact{grid-template-columns:repeat(auto-fill,minmax(min(100%,228px),1fr))}
.lab-four-kinds-of-number .fk-card{--fk-pad:20px;position:relative;display:flex;flex-direction:column;min-width:0;background:var(--fk-paper);color:var(--fk-ink);padding:18px var(--fk-pad) var(--fk-pad);border-radius:3px;box-shadow:inset 0 4px 0 var(--fk-k,transparent),0 1px 0 rgba(0,0,0,.4),0 12px 26px -16px rgba(0,0,0,.9);transition:box-shadow .2s ease,transform .18s ease}
.lab-four-kinds-of-number .fk-card[data-state=retry]{--fk-k:var(--fk-muted)}
/* The card in hand: raised while a keyboard user is on its choices, or under a mouse; a tap leaves it lying flat. */
.lab-four-kinds-of-number .fk-card:has(:focus-visible){transform:translateY(-3px);box-shadow:inset 0 4px 0 var(--fk-k,transparent),0 1px 0 rgba(0,0,0,.4),0 20px 34px -14px rgba(0,0,0,.95)}
@media (hover:hover){.lab-four-kinds-of-number .fk-card:hover{transform:translateY(-3px)}}
.lab-four-kinds-of-number .fk-card :focus-visible{outline-color:var(--fk-ink)}
.lab-four-kinds-of-number .fk-date{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:22px;margin:0 0 14px;font:650 13px/1.3 var(--ed-sans,Inter,Arial,sans-serif);letter-spacing:.06em;text-transform:uppercase;color:var(--fk-ink)}
.lab-four-kinds-of-number .fk-stamp{display:inline-flex;flex:none}
.lab-four-kinds-of-number .fk-card[data-state=retry] .fk-stamp{opacity:.35}
.lab-four-kinds-of-number .fk-figure{font-family:var(--ed-display,var(--display,Georgia,serif));font-weight:400;font-size:clamp(36px,3.7vw,46px);line-height:1.05;letter-spacing:-.02em;margin:0 0 10px;color:var(--fk-ink);font-variant-numeric:lining-nums}
.lab-four-kinds-of-number .fk-prefix{display:block;font:500 14px/1.3 var(--ed-sans,Inter,Arial,sans-serif);letter-spacing:0;color:var(--fk-muted);margin:0 0 6px}
.lab-four-kinds-of-number .fk-unit{font-size:.42em;letter-spacing:0;margin-left:.08em}
.lab-four-kinds-of-number .fk-label{font-size:15px;line-height:1.45;margin:0 0 8px}
.lab-four-kinds-of-number .fk-source{font-size:14px;line-height:1.4;color:var(--fk-muted);margin:0 0 18px}
.lab-four-kinds-of-number .fk-answer{position:relative;margin-top:auto;padding-top:18px;border-top:1px dashed #BDB7AA}
.lab-four-kinds-of-number .fk-answer::before,.lab-four-kinds-of-number .fk-answer::after{content:"";position:absolute;top:-8px;width:16px;height:16px;border-radius:50%;background:var(--fk-night,#16222A)}
.lab-four-kinds-of-number .fk-answer::before{left:calc(-1 * var(--fk-pad) - 8px)}
.lab-four-kinds-of-number .fk-answer::after{right:calc(-1 * var(--fk-pad) - 8px)}
/* Cards in a row share their rows: the big figures sit on one baseline even when only some carry
   "More than", and the labels, sources and stubs line up beneath them. */
@supports (grid-template-rows:subgrid){
  .lab-four-kinds-of-number .fk-cards{row-gap:0;margin-bottom:-20px}
  .lab-four-kinds-of-number .fk-card{display:grid;grid-row:span 5;grid-template-rows:subgrid;row-gap:0;margin-bottom:20px}
  .lab-four-kinds-of-number .fk-figure{align-self:end}
  .lab-four-kinds-of-number .fk-answer{margin-top:0}
}

/* Each card's choice of tray: a radio group drawn as chips that carry each kind's sign */
.lab-four-kinds-of-number .fk-options{border:0;margin:0;padding:0;min-width:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:1fr;gap:8px}
.lab-four-kinds-of-number .fk-option{position:relative;display:block;min-width:0}
.lab-four-kinds-of-number .fk-option input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer;z-index:1}
.lab-four-kinds-of-number .fk-chip{display:flex;align-items:center;gap:10px;height:100%;min-height:48px;padding:8px 10px;border:1px solid var(--fk-rule);border-radius:3px;background:transparent;font:500 14px/1.25 var(--ed-sans,Inter,Arial,sans-serif);color:var(--fk-ink);transition:background-color .15s ease,border-color .15s ease,box-shadow .15s ease}
.lab-four-kinds-of-number .fk-chip .fk-glyph{width:28px;height:18px}
.lab-four-kinds-of-number .fk-option input:hover+.fk-chip{border-color:var(--fk-k,var(--fk-ink));background:rgba(21,28,33,.035)}
.lab-four-kinds-of-number .fk-option input:checked+.fk-chip{background:var(--fk-kt,var(--fk-ink));border-color:var(--fk-k,var(--fk-ink));box-shadow:inset 0 0 0 1px var(--fk-k,var(--fk-ink));font-weight:650}
.lab-four-kinds-of-number .fk-option input:focus-visible+.fk-chip{outline:3px solid var(--fk-ink);outline-offset:2px}
.lab-four-kinds-of-number .fk-option.is-tried .fk-chip-text{text-decoration:line-through;text-decoration-thickness:1px}
.lab-four-kinds-of-number .fk-option.is-tried .fk-glyph{opacity:.4}
.lab-four-kinds-of-number .fk-option.is-tried input:not(:checked)+.fk-chip{color:var(--fk-muted)}
.lab-four-kinds-of-number .fk-option.is-tried input:checked+.fk-chip{background:var(--ed-stone,#ECE7DC);border-color:var(--fk-muted);box-shadow:none;font-weight:500}
/* The day profiles in the closing figure keep a plain radio mark */
.lab-four-kinds-of-number .fk-profiles .fk-chip{background:var(--fk-paper)}
.lab-four-kinds-of-number .fk-profiles .fk-chip::before{content:"";flex:none;width:14px;height:14px;border-radius:50%;border:1.5px solid var(--fk-ink);background:var(--fk-paper);box-sizing:border-box}
.lab-four-kinds-of-number .fk-profiles .fk-option input:checked+.fk-chip{background:var(--fk-ink);border-color:var(--fk-ink);color:var(--fk-paper);box-shadow:none}
.lab-four-kinds-of-number .fk-profiles .fk-option input:checked+.fk-chip::before{border-color:var(--fk-paper);background:var(--fk-paper);box-shadow:inset 0 0 0 3px var(--fk-ink)}
.lab-four-kinds-of-number .fk-profiles .fk-option input:hover+.fk-chip{border-color:var(--fk-ink)}

/* Feedback on a card: plain words, no stamps of approval */
.lab-four-kinds-of-number .fk-hint{margin:12px 0 0;padding:10px 12px;background:var(--ed-stone,#ECE7DC);border-left:3px solid var(--fk-muted);font-size:15px;line-height:1.5}
.lab-four-kinds-of-number .fk-hint-lead{font-weight:650}
.lab-four-kinds-of-number .fk-verdict-head{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin:0;font-size:15px;line-height:1.3;min-height:28px}
.lab-four-kinds-of-number .fk-verdict-glyph{display:inline-flex}
.lab-four-kinds-of-number .fk-verdict-kind{font-weight:650;color:var(--fk-k,var(--fk-ink))}
.lab-four-kinds-of-number .fk-verdict-note{margin-left:auto;font-size:14px;font-weight:500;color:var(--fk-muted)}
.lab-four-kinds-of-number .fk-why{font-size:15px;line-height:1.5;margin:10px 0 0}

/* Controls along the table's lower edge. The site's older CDU lab styles `.lab-controls button` in
   portal.css, edition.css and identity.css; these rules keep that from reaching this activity. */
.lab-four-kinds-of-number .fk-controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 24px;margin:30px 0 0;padding:20px 0 0;border:0;border-top:1px solid rgba(247,244,238,.18)}
.lab-four-kinds-of-number .fk-buttons{display:flex;flex-wrap:wrap;gap:10px}
.lab-four-kinds-of-number .fk-controls .lab-button{flex:none;position:static;min-height:48px;padding:12px 22px;font-size:15px;text-align:center;background:transparent;color:var(--fk-on-night);border:1px solid rgba(247,244,238,.55)}
.lab-four-kinds-of-number .fk-controls .lab-button::after{content:none}
.lab-four-kinds-of-number .fk-controls .lab-button:hover{border-color:var(--fk-on-night);background:rgba(247,244,238,.08)}
.lab-four-kinds-of-number .fk-controls .lab-button.is-primary{background:var(--fk-on-night);color:var(--ed-ink,#151C21);border-color:var(--fk-on-night)}
.lab-four-kinds-of-number .fk-controls .lab-button.is-primary:hover{background:#fff}
.lab-four-kinds-of-number .fk-status{flex:1 1 300px;margin:0;font-size:15px;line-height:1.45;color:#C9CFCC;max-width:62ch}

/* Reasoning, on paper, without a box */
.lab-four-kinds-of-number .fk-reasoning{background:none;border:0;border-top:1px solid var(--fk-ink);padding:26px 0 0;margin:44px 0 0}
.lab-four-kinds-of-number .fk-reasoning>h3{font-size:clamp(28px,3.4vw,38px)}
.lab-four-kinds-of-number .fk-reasoning>p:not(.lab-ref){font-size:17px;line-height:1.6;max-width:64ch}
.lab-four-kinds-of-number .fk-reasoning~.lab-actions{margin-top:28px}

/* Round 1 reasoning: what each figure measured */
.lab-four-kinds-of-number .fk-side{margin:24px 0 22px;padding:0;border-top:1px solid var(--fk-ink)}
.lab-four-kinds-of-number .fk-row{display:grid;grid-template-columns:minmax(180px,250px) minmax(0,1fr);gap:10px 36px;padding:20px 0;border-bottom:1px solid var(--fk-rule);align-items:start}
.lab-four-kinds-of-number .fk-row-title{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:650;line-height:1.35;margin:0}
.lab-four-kinds-of-number .fk-row-date{font-size:13px;line-height:1.4;color:var(--fk-muted);margin:4px 0 0 42px}
.lab-four-kinds-of-number .fk-row-note{font-size:15px;line-height:1.45;color:var(--fk-muted);margin:8px 0 0}
.lab-four-kinds-of-number .fk-bar{display:block;width:100%;height:22px;overflow:visible}
.lab-four-kinds-of-number .fk-bar.is-thin{height:14px}
.lab-four-kinds-of-number .fk-bar-whole{fill:none;stroke:var(--fk-design);stroke-width:1.5;stroke-dasharray:5 3}
.lab-four-kinds-of-number .fk-bar-part.is-operating{fill:var(--fk-operating)}
.lab-four-kinds-of-number .fk-hatch-bg{fill:var(--fk-commitment-tint)}
.lab-four-kinds-of-number .fk-hatch-line{stroke:var(--fk-commitment);stroke-width:1.6}
.lab-four-kinds-of-number .fk-bar-edge{stroke:var(--fk-commitment);stroke-width:2}
.lab-four-kinds-of-number .fk-bar-labels{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2px 16px;margin:8px 0 0;max-width:none;font-size:14px;line-height:1.4}
.lab-four-kinds-of-number .fk-bar-labels span{font-weight:600}
.lab-four-kinds-of-number .fk-bar-labels .is-design{color:var(--fk-design)}
.lab-four-kinds-of-number .fk-bar-labels .is-operating{color:var(--fk-operating)}
.lab-four-kinds-of-number .fk-bar-labels .is-commitment{color:var(--fk-commitment)}
.lab-four-kinds-of-number .fk-series{display:block;width:100%;height:64px;overflow:visible}
.lab-four-kinds-of-number .fk-series-bar{fill:var(--fk-load)}
.lab-four-kinds-of-number .fk-series-base{stroke:var(--fk-ink);stroke-width:1}
.lab-four-kinds-of-number .fk-series-labels{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));column-gap:6px;text-align:center}
.lab-four-kinds-of-number .fk-series-value{display:block;font:400 18px/1.2 var(--ed-display,Georgia,serif);color:var(--fk-load)}
.lab-four-kinds-of-number .fk-series-when{display:block;font-size:13px;line-height:1.3;color:var(--fk-muted)}
.lab-four-kinds-of-number .fk-growth{display:grid;gap:12px}
.lab-four-kinds-of-number .fk-growth-label{display:block;font-size:14px;line-height:1.4;margin:0 0 5px;color:var(--fk-design);font-weight:600}

/* Closing: the four lessons and the rate-and-total figure */
.lab-four-kinds-of-number .fk-lessons{list-style:none;margin:10px 0 30px;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 36px;border-top:1px solid var(--fk-ink)}
.lab-four-kinds-of-number .fk-lessons li{display:flex;align-items:center;gap:16px;padding:16px 0;border-bottom:1px solid var(--fk-rule);font:400 clamp(19px,2.1vw,23px)/1.3 var(--ed-display,Georgia,serif)}
.lab-four-kinds-of-number .fk-rate{margin:4px 0 26px;max-width:780px}
.lab-four-kinds-of-number .fk-profiles{max-width:560px;margin:0 0 22px;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr))}
.lab-four-kinds-of-number .fk-profiles legend{display:block;font-size:13px;font-weight:650;letter-spacing:.01em;line-height:1.3;margin:0;padding:0 0 8px}
/* The y-axis column has a fixed width so the hours slider below can sit exactly under the plot. */
.lab-four-kinds-of-number .fk-chart{display:grid;grid-template-columns:28px minmax(0,1fr);column-gap:10px;container:fk-chart / inline-size}
.lab-four-kinds-of-number .fk-yunit{grid-column:1;grid-row:1;font-size:13px;line-height:1;color:var(--fk-muted);text-align:right;margin:0 0 10px}
.lab-four-kinds-of-number .fk-yaxis{grid-column:1;grid-row:2;position:relative}
.lab-four-kinds-of-number .fk-yaxis span{position:absolute;right:0;transform:translateY(-50%);font-size:13px;line-height:1;color:var(--fk-muted);font-variant-numeric:tabular-nums}
.lab-four-kinds-of-number .fk-plot{grid-column:2;grid-row:2;position:relative;height:clamp(160px,22vw,210px)}
.lab-four-kinds-of-number .fk-plot-svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.lab-four-kinds-of-number .fk-grid{stroke:var(--fk-rule);stroke-width:1}
.lab-four-kinds-of-number .fk-axis{stroke:var(--fk-ink);stroke-width:1}
.lab-four-kinds-of-number .fk-area{fill:var(--fk-total-tint)}
.lab-four-kinds-of-number .fk-rate-line{stroke:var(--fk-rate);stroke-width:3;stroke-linecap:square}
.lab-four-kinds-of-number .fk-rate-ahead{stroke:var(--fk-rate);stroke-width:1.5;stroke-dasharray:4 4;opacity:.55}
.lab-four-kinds-of-number .fk-rate-drop{stroke:var(--fk-total);stroke-width:1.5;stroke-dasharray:3 3}
.lab-four-kinds-of-number .fk-rate-labels{position:absolute;inset:0;pointer-events:none}
.lab-four-kinds-of-number .fk-rate-label{position:absolute;left:0;transform:translateY(calc(-100% - 7px));font-size:13px;font-weight:650;line-height:1;color:var(--fk-rate);white-space:nowrap}
.lab-four-kinds-of-number .fk-area-label{position:absolute;transform:translate(-50%,-50%);font:400 clamp(22px,2.8vw,30px)/1 var(--ed-display,Georgia,serif);color:#15555C;white-space:nowrap;font-variant-numeric:tabular-nums}
.lab-four-kinds-of-number .fk-area-label.is-outside{transform:translateY(-50%);background:var(--fk-paper);padding:2px 6px 2px 4px}
.lab-four-kinds-of-number .fk-xaxis{grid-column:2;grid-row:3;position:relative;height:18px;margin:8px 0 0}
.lab-four-kinds-of-number .fk-xaxis span{position:absolute;top:0;transform:translateX(-50%);font-size:13px;line-height:1.3;color:var(--fk-muted);white-space:nowrap}
.lab-four-kinds-of-number .fk-xaxis span:first-child{transform:none}
.lab-four-kinds-of-number .fk-xaxis span:last-child{transform:translateX(-100%)}
/* On a narrow plot, label 00:00, 12:00 and 24:00 only, so the clock times never run together. */
@container fk-chart (max-width:300px){.lab-four-kinds-of-number .fk-xaxis span:nth-child(2n){display:none}}
/* The slider spans the plot (38px = the y-axis column and its gap). Its track is sized so the thumb
   centre sits on the shaded area's right edge: 1 hour at 1/24 of the plot, 24 hours at its end
   (Chromium and WebKit draw a 16px thumb whose centre travels the track less 8px at each end). */
.lab-four-kinds-of-number .fk-range{margin:22px 0 0 38px;max-width:none;min-width:0;flex:none}
.lab-four-kinds-of-number .fk-range label{font-size:14px;flex-wrap:wrap;row-gap:2px}
.lab-four-kinds-of-number .fk-range label>*{white-space:nowrap}
.lab-four-kinds-of-number .fk-range input[type=range]{width:calc(100% * 23 / 24 + 16px);margin:0 0 0 calc(100% / 24 - 8px)}
.lab-four-kinds-of-number .fk-rate-readout{margin-top:16px;grid-template-columns:repeat(3,minmax(0,1fr))}
.lab-four-kinds-of-number .fk-rate-readout dt{display:flex;align-items:center;gap:8px;font-size:13px}
.lab-four-kinds-of-number .fk-rate-readout dt .fk-glyph{width:26px;height:16px}
.lab-four-kinds-of-number .fk-rate-readout .is-rate dd{color:var(--fk-rate)}
.lab-four-kinds-of-number .fk-rate-readout .is-total dd{color:var(--fk-total)}
.lab-four-kinds-of-number .fk-closing>p:not(.lab-ref){max-width:64ch}

@media (max-width:900px){
  .lab-four-kinds-of-number .fk-trays{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  .lab-four-kinds-of-number .fk-row{grid-template-columns:minmax(0,1fr);gap:10px}
  .lab-four-kinds-of-number .fk-lessons{grid-template-columns:minmax(0,1fr)}
  .lab-four-kinds-of-number .fk-card{--fk-pad:16px}
  .lab-four-kinds-of-number .fk-trays{gap:22px 16px}
}
@media (max-width:374px){
  .lab-four-kinds-of-number .fk-trays,.lab-four-kinds-of-number .fk-trays.is-two{grid-template-columns:minmax(0,1fr)}
  .lab-four-kinds-of-number .fk-options{grid-template-columns:minmax(0,1fr)}
  .lab-four-kinds-of-number .fk-options.is-two{grid-template-columns:repeat(2,minmax(0,1fr))}
  .lab-four-kinds-of-number .fk-card{--fk-pad:14px}
  .lab-four-kinds-of-number .fk-rate-readout{grid-template-columns:repeat(2,minmax(0,1fr))}
  .lab-four-kinds-of-number .fk-rate-readout .fk-total{grid-column:1/-1}
}

/* An editorial sorting desk, with precise figure cards instead of theatrical tickets. */
.lab-four-kinds-of-number .fk-table{background-image:none;border:1px solid var(--lab-console-rule);border-radius:4px;padding:28px}
.lab-four-kinds-of-number .fk-head{padding-bottom:22px;border-bottom:1px solid #ffffff24}
.lab-four-kinds-of-number .fk-head .lab-step-count{font-size:11px;line-height:1.5;letter-spacing:.1em;margin-bottom:10px;color:#aebfc0}
.lab-four-kinds-of-number .fk-title{font-size:30px;line-height:1.2;letter-spacing:-.02em}
.lab-four-kinds-of-number .fk-trays{gap:20px;margin:24px 0 28px}
.lab-four-kinds-of-number .fk-tray-name{font-size:14px;line-height:1.4;padding-top:12px}
.lab-four-kinds-of-number .fk-tray-name .fk-glyph{width:26px;height:17px}
.lab-four-kinds-of-number .fk-tray-def{font-size:13px;line-height:1.55;margin:8px 0 14px}
.lab-four-kinds-of-number .fk-slot{border-style:solid;border-color:#ffffff24;background:#08191f38;border-radius:3px;padding:8px;min-height:58px}
.lab-four-kinds-of-number .fk-token{border-left-width:2px;border-radius:3px;padding:7px 10px;font-size:16px;line-height:1.3}
.lab-four-kinds-of-number .fk-cards{gap:16px}
.lab-four-kinds-of-number .fk-card{border:1px solid #d5d9d2;border-radius:4px;box-shadow:inset 0 2px 0 var(--fk-k,transparent);padding-top:20px;transition:border-color 160ms ease,box-shadow 160ms ease}
.lab-four-kinds-of-number .fk-card:hover,.lab-four-kinds-of-number .fk-card:has(:focus-visible){transform:none;border-color:#8a9e97;box-shadow:inset 0 2px 0 var(--fk-k,transparent),0 0 0 1px #8a9e97}
.lab-four-kinds-of-number .fk-date{font-size:11px;line-height:1.45;letter-spacing:.06em;margin-bottom:16px}
.lab-four-kinds-of-number .fk-figure{font-size:clamp(34px,3.4vw,44px);line-height:1.08;letter-spacing:-.035em;margin-bottom:12px}
.lab-four-kinds-of-number .fk-prefix{font-size:12px;line-height:1.4;margin-bottom:7px}
.lab-four-kinds-of-number .fk-label{font-size:15px;line-height:1.6}
.lab-four-kinds-of-number .fk-source{font-size:12px;line-height:1.5;color:#58655d;margin-bottom:20px}
.lab-four-kinds-of-number .fk-answer{border-top-style:solid;border-top-color:#d5d9d2;padding-top:16px}
.lab-four-kinds-of-number .fk-answer::before,.lab-four-kinds-of-number .fk-answer::after{display:none}
.lab-four-kinds-of-number .fk-options{gap:8px}
.lab-four-kinds-of-number .fk-chip{border-radius:5px;font-size:13px;line-height:1.4;min-height:48px;padding:9px 10px;background:#ffffff55}
.lab-four-kinds-of-number .fk-chip .fk-glyph{width:24px;height:16px}
.lab-four-kinds-of-number .fk-option input:checked+.fk-chip{box-shadow:inset 2px 0 0 var(--fk-k,var(--fk-ink));border-color:var(--fk-k,var(--fk-ink))}
.lab-four-kinds-of-number .fk-card:is([data-state=right],[data-state=shown]){border-color:#91a9a0}
.lab-four-kinds-of-number .fk-card:is([data-state=right],[data-state=shown]) .fk-answer{border-top-color:#b6c3ba}
.lab-four-kinds-of-number .fk-token:is([data-state=right],[data-state=shown]){border:1px solid var(--fk-k);border-left-width:2px}
.lab-four-kinds-of-number .fk-hint{border-left-width:2px;border-radius:0 4px 4px 0;font-size:14px;line-height:1.6;padding:12px 14px}
.lab-four-kinds-of-number .fk-reasoning{border-top-color:var(--fk-rule);margin-top:32px}
.lab-four-kinds-of-number .fk-reasoning>h3{font-size:30px;line-height:1.2}
.lab-four-kinds-of-number .fk-lessons li{font-size:21px;line-height:1.4}
@media(max-width:600px){
  .lab-four-kinds-of-number .fk-table{padding:20px 16px;border-radius:4px}
  .lab-four-kinds-of-number .fk-head{padding-bottom:18px}
  .lab-four-kinds-of-number .fk-title{font-size:26px}
  .lab-four-kinds-of-number .fk-trays{gap:20px 16px;margin-block:20px 24px}
  .lab-four-kinds-of-number .fk-card{padding-top:18px}
}

/* Four distinct semantic channels on one calibrated sorting surface. */
.lab-four-kinds-of-number .fk-table{
  --fk-night:#10262f;--fk-on-night-muted:#b6cbd0;
  background-image:linear-gradient(#d6eef604 1px,transparent 1px),linear-gradient(90deg,#d6eef604 1px,transparent 1px);
  background-size:48px 48px;border-color:#46636d;box-shadow:inset 0 1px 0 #a2dbe124
}
.lab-four-kinds-of-number .fk-tray{background:#18343d;border-radius:3px;box-shadow:inset 0 0 0 1px #6c929b38}
.lab-four-kinds-of-number .fk-tray-name{padding-inline:10px}
.lab-four-kinds-of-number .fk-tray-def{padding-inline:10px}
.lab-four-kinds-of-number .fk-slot{background:#0c222b;border-color:#58737c;border-radius:0 0 3px 3px}
.lab-four-kinds-of-number .fk-tray.is-target{box-shadow:inset 0 0 0 1px var(--fk-k)}
.lab-four-kinds-of-number .fk-tray.is-target .fk-slot{background:#1c3e48}
.lab-four-kinds-of-number .fk-card[data-state=chosen]{border-color:#527e85;box-shadow:inset 0 2px 0 var(--fk-k),0 0 0 1px #527e85}
.lab-four-kinds-of-number .fk-card:is([data-state=right],[data-state=shown]){border-color:#618f86;box-shadow:inset 0 2px 0 var(--fk-k)}
.lab-four-kinds-of-number .fk-token[data-state=chosen]{border:1px solid var(--fk-k);border-left-width:2px}
.lab-four-kinds-of-number .fk-status{color:#c4d9dc}
@media(prefers-reduced-motion:no-preference){
  html[data-motion=on] .lab-four-kinds-of-number .fk-option input:checked+.fk-chip .fk-glyph{animation:lab-mark-confirm 280ms ease-out both}
  html[data-motion=on] .lab-four-kinds-of-number .fk-card:is([data-state=right],[data-state=shown]) .fk-verdict{animation:lab-reading-arrive 260ms ease-out both}
}