/* Figure 2. Inside the laboratory: the friend's measurement is a contact. Every class is prefixed wf2-.
   Colours with a meaning: cyan = what is held (the photon's paths, the register's values); ink = the weights. */
.wf2 {
  --k-paper: var(--wf-paper, #faf8f3); --k-ink: var(--wf-ink, #1d1d1b); --k-body: var(--wf-body, #2a2926); --k-soft: var(--wf-soft, #3c3a36);
  --k-hair: var(--wf-hair, #8a8a8a); --k-rule: var(--wf-rule, color-mix(in srgb, var(--k-ink) 16%, var(--k-paper)));
  --k-tint: var(--wf-tint, color-mix(in srgb, var(--k-ink) 5%, var(--k-paper)));
  --k-c: var(--wf-cyan, #009fe3); --k-c-text: var(--wf-cyan-text, #0072b5);
  --k-text: var(--wf-text, "InterVariable", "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif);
  --k-display: var(--wf-display, "Inter Display", "InterVariable", "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif);
  --k-mono: var(--wf-mono, "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace);
  container-type: inline-size;
  margin: 0; padding: clamp(.9rem, 1.8vw, 1.25rem); background: var(--k-paper); color: var(--k-body);
  border: 1px solid var(--k-ink); font-family: var(--k-text); font-weight: 420; line-height: 1.42; box-sizing: border-box; position: relative;
}
@media screen and (prefers-color-scheme: dark) {
  .wf2 { --k-paper: var(--wf-paper, #141413); --k-ink: var(--wf-ink, #faf8f3); --k-body: var(--wf-body, #e9e6df); --k-soft: var(--wf-soft, #c9c5bc);
    --k-c: var(--wf-cyan, #2bb3f0); --k-c-text: var(--wf-cyan-text, #2bb3f0); --k-tint: var(--wf-tint, color-mix(in srgb, var(--k-ink) 7%, var(--k-paper))); }
}
.wf2 *, .wf2 *::before, .wf2 *::after { box-sizing: border-box; }
.wf2-label { margin: 0; font: 700 .7rem/1.3 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-soft); }
.wf2-gk { font-style: normal; text-transform: none; letter-spacing: 0; }
.wf2-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1rem; align-items: baseline;
  padding-bottom: .7rem; margin-bottom: .9rem; border-bottom: 1px solid var(--k-rule); }
.wf2-live { color: var(--k-ink); }
.wf2-live::before { content: ""; display: inline-block; width: .5rem; height: .5rem; margin-right: .45rem; background: var(--k-c); vertical-align: .05rem; }
.wf2-grid { display: grid; grid-template-columns: 1fr; gap: 1.2rem; }
@container (min-width: 720px) { .wf2-grid { grid-template-columns: minmax(15rem, 20rem) minmax(0, 1fr); gap: clamp(1.25rem, 3vw, 2.5rem); } }
.wf2-th { margin: .3rem 0 .4rem; font-family: var(--k-display); font-weight: 860; font-size: clamp(2.2rem, 4.6vw, 3rem); line-height: .9; letter-spacing: -.05em; color: var(--k-ink); font-variant-numeric: tabular-nums; }
.wf2-range { width: 100%; margin: .3rem 0 0; accent-color: var(--k-ink); height: 32px; cursor: pointer; }
.wf2-range:focus-visible { outline: 3px solid var(--k-c-text); outline-offset: 3px; }
.wf2-ticks { display: flex; justify-content: space-between; font: 400 .66rem/1.3 var(--k-mono); color: var(--k-soft); }
.wf2-t45 { text-align: center; }
.wf2-before { display: block; width: 100%; max-width: 330px; margin-top: 1rem; overflow: visible; }
.wf2-parts { display: grid; grid-template-columns: 1fr; gap: 1rem; align-content: start; }
@container (min-width: 520px) { .wf2-parts { grid-template-columns: 1fr 1fr; } .wf2-words { grid-column: 1 / -1; } }
.wf2-part { border-top: 2px solid var(--k-ink); padding-top: .5rem; min-width: 0; }
.wf2-ptitle { margin: 0 0 .2rem; font: 700 .76rem/1.3 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--k-ink); }
.wf2-pic { display: block; width: 100%; max-width: 340px; overflow: visible; }
.wf2-bar { height: 12px; border: 1px solid var(--k-ink); margin-top: .4rem; background: var(--k-paper); }
.wf2-fill { display: block; height: 100%; background: var(--k-ink); width: 0; }
.wf2-w { margin: .35rem 0 0; font-family: var(--k-mono); font-size: .8rem; color: var(--k-soft); }
.wf2-w b { font-family: var(--k-display); font-weight: 820; font-size: 1.6rem; letter-spacing: -.03em; color: var(--k-ink); font-variant-numeric: tabular-nums; }
.wf2-words { margin: .2rem 0 0; font-size: .95rem; line-height: 1.38; color: var(--k-ink); max-width: 46rem; }
.wf2-pic text, .wf2-before text { font-family: var(--k-mono); fill: var(--k-soft); font-size: 10px; letter-spacing: .04em; paint-order: stroke; stroke: var(--k-paper); stroke-width: 3px; stroke-linejoin: round; }
.wf2-before .cap { font-weight: 700; letter-spacing: .12em; text-transform: uppercase; fill: var(--k-ink); }
.wf2-pic .sgn, .wf2-before .sgn { font-size: 11px; font-weight: 700; fill: var(--k-ink); }
.wf2 .path { fill: none; stroke: var(--k-c); stroke-width: 1.6; }
.wf2 .path.dim { stroke: var(--k-hair); stroke-width: 1; stroke-dasharray: 3 3; }
.wf2 .photon { fill: var(--k-c); }
.wf2 .reg { fill: none; stroke: var(--k-c); stroke-width: 1.4; }
.wf2 .mid { stroke: var(--k-hair); stroke-width: 1; }
.wf2 .val { fill: var(--k-c); }
.wf2-cap { margin: 1rem 0 0; font-size: .84rem; line-height: 1.4; color: var(--k-soft); max-width: 60rem; }
.wf2-sr { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
@media (forced-colors: active) {
  .wf2 .path, .wf2 .reg { stroke: LinkText; } .wf2 .val, .wf2 .photon { fill: LinkText; }
  .wf2-fill { background: CanvasText; forced-color-adjust: none; } .wf2-bar { border-color: CanvasText; }
  .wf2 text { fill: CanvasText; stroke: Canvas; }
}
@media print { .wf2 { --k-paper: #fff; --k-ink: #000; --k-body: #111; --k-soft: #333; break-inside: avoid; } .wf2, .wf2 * { -webkit-print-color-adjust: exact; print-color-adjust: exact; } }
.wf2 .chan { fill: none; stroke: var(--k-ink); stroke-width: 1.2; }
.wf2 .cdot { fill: var(--k-paper); stroke: var(--k-hair); stroke-width: 1.2; }
.wf2 .cdot.on { fill: var(--k-ink); stroke: var(--k-ink); }
.wf2-pic .strong, .wf2-before .strong { fill: var(--k-ink); font-weight: 700; }
.wf2-mark { margin: .1rem 0 0; font-size: .9rem; line-height: 1.36; color: var(--k-body); max-width: 46rem; grid-column: 1 / -1; }
.wf2-pic .faint, .wf2-before .faint { fill: var(--k-soft); opacity: .7; }