/* Figure 2. Play it: the guessing game, real rounds tallied beside both bounds.
   Every class is prefixed bi2-. Colours with a meaning, as on the page: cyan = values written in advance (the cards) and
   their bound 3/4; magenta = acts that write (the cube's acts) and their rate (2 + √2)/4; hairline grey = 1. */
.bi2 {
  --k-paper: var(--bi-paper, #faf8f3); --k-ink: var(--bi-ink, #1d1d1b); --k-body: var(--bi-body, #2a2926); --k-soft: var(--bi-soft, #3c3a36);
  --k-hair: var(--bi-hair, #8a8a8a); --k-rule: var(--bi-rule, color-mix(in srgb, var(--k-ink) 16%, var(--k-paper)));
  --k-c: var(--bi-cyan, #009fe3); --k-m: var(--bi-magenta, #e6007e); --k-c-text: var(--bi-cyan-text, #0072b5); --k-m-text: var(--bi-magenta-text, #c4006b);
  --k-m-tint: color-mix(in srgb, var(--k-m) 8%, var(--k-paper));
  --k-text: var(--bi-text, "InterVariable", "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif);
  --k-display: var(--bi-display, "Inter Display", "InterVariable", "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif);
  --k-mono: var(--bi-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;
  font-optical-sizing: auto; box-sizing: border-box; position: relative;
}
@media screen and (prefers-color-scheme: dark) {
  .bi2 { --k-paper: var(--bi-paper, #141413); --k-ink: var(--bi-ink, #faf8f3); --k-body: var(--bi-body, #e9e6df); --k-soft: var(--bi-soft, #c9c5bc);
    --k-c: var(--bi-cyan, #2bb3f0); --k-m: var(--bi-magenta, #ff3d9e); --k-c-text: var(--bi-cyan-text, #2bb3f0); --k-m-text: var(--bi-magenta-text, #ff6fb6);
    --k-m-tint: color-mix(in srgb, var(--k-m) 13%, var(--k-paper)); }
}
.bi2 *, .bi2 *::before, .bi2 *::after { box-sizing: border-box; }
.bi2-label { margin: 0; font: 700 .7rem/1.3 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-soft); }
.bi2-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); }
.bi2-head .bi2-live { color: var(--k-ink); }
.bi2-live::before { content: ""; display: inline-block; width: .5rem; height: .5rem; margin-right: .45rem; background: var(--k-m); vertical-align: .05rem; }
.bi2-lede { margin: 0 0 .7rem; max-width: 52rem; font-size: 1.05rem; font-weight: 450; line-height: 1.32; color: var(--k-ink); }
.bi2-rules { margin: 0 0 .8rem; max-width: 52rem; font-size: .92rem; line-height: 1.4; color: var(--k-body); }
.bi2-rules b { color: var(--k-ink); font-weight: 650; }
.bi2-scale { display: block; width: 100%; overflow: visible; }
.bi2-scale text { font-family: var(--k-mono); fill: var(--k-soft); paint-order: stroke; stroke: var(--k-paper); stroke-width: 3px; stroke-linejoin: round; }
.bi2-scale .t-cap { font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.bi2-scale .t-val { font-weight: 700; font-size: 12px; fill: var(--k-ink); letter-spacing: .02em; }
.bi2-scale .t-tick { font-size: 10px; }
.bi2-scale .t-small { font-size: 9px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.bi2-scale .t-row { font-size: 9.5px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.bi2-scale .t-read { fill: var(--k-c-text); }
.bi2-scale .t-write { fill: var(--k-m-text); }
.bi2-scale .axis { stroke: var(--k-ink); stroke-width: 1.2; }
.bi2-scale .tick { stroke: var(--k-ink); stroke-width: 1; }
.bi2-scale .c-read { stroke: var(--k-c); stroke-width: 2.4; }
.bi2-scale .c-write { stroke: var(--k-m); stroke-width: 2.4; }
.bi2-scale .c-table { stroke: var(--k-hair); stroke-width: 1.2; stroke-dasharray: 4 3; }
.bi2-scale .band { fill: var(--k-m-tint); stroke: none; }
.bi2-scale .band-read { fill: var(--k-c); opacity: .08; stroke: none; }
.bi2-scale .ex { stroke-width: 1.4; fill: var(--k-paper); }
.bi2-scale .ex-read { stroke: var(--k-c); }
.bi2-scale .ex-write { stroke: var(--k-m); }
.bi2-scale .tb { stroke-width: 1.6; }
.bi2-scale .tb-read { stroke: var(--k-c); }
.bi2-scale .tb-write { stroke: var(--k-m); }
.bi2-scale .td { stroke: none; }
.bi2-scale .td-read { fill: var(--k-c); }
.bi2-scale .td-write { fill: var(--k-m); }
.bi2-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1rem clamp(1rem, 2.5vw, 2rem); margin-top: .8rem; padding-top: .8rem; border-top: 1px solid var(--k-rule); }
.bi2-col { min-width: 0; display: flex; flex-direction: column; gap: .55rem; padding-left: .8rem; border-left: 3px solid var(--k-c); }
.bi2-col-m { border-left-color: var(--k-m); }
.bi2-col-m[data-acts="read"] { border-left-color: var(--k-c); }
.bi2-col-m[data-acts="read"] .bi2-lt { color: var(--k-c-text); }
.bi2-col-m[data-acts="read"] .bi2-strip i { border-color: var(--k-c); }
.bi2-col-m[data-acts="read"] .bi2-strip i.w { background: var(--k-c); }
.bi2-seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--k-ink); width: max-content; max-width: 100%; }
.bi2-seg button { appearance: none; border: 0; border-radius: 0; background: transparent; color: var(--k-ink); cursor: pointer;
  font: 700 .64rem/1 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; padding: .55rem .7rem; min-height: 34px; }
.bi2-seg button + button { border-left: 1px solid var(--k-ink); }
.bi2-seg button[aria-pressed="true"] { background: var(--k-ink); color: var(--k-paper); }
.bi2-seg button:hover:not([aria-pressed="true"]) { background: color-mix(in srgb, var(--k-ink) 8%, transparent); }
.bi2-seg button:focus-visible { outline: 2px solid var(--k-ink); outline-offset: 2px; }
.bi2-col-c .bi2-lt { color: var(--k-c-text); }
.bi2-col-m .bi2-lt { color: var(--k-m-text); }
.bi2-cards { display: flex; flex-wrap: wrap; gap: .7rem; }
.bi2-card { border: 1px solid var(--k-ink); padding: .45rem .6rem .55rem; min-width: 10.5rem; }
.bi2-cl { margin: 0 0 .35rem; font: 700 .62rem/1.3 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--k-ink); }
.bi2-slot { display: flex; align-items: center; justify-content: space-between; gap: .6rem; font: 400 .78rem/1.3 var(--k-mono); color: var(--k-body); }
.bi2-slot + .bi2-slot { margin-top: .3rem; }
.bi2-slot button { appearance: none; border: 1px solid var(--k-c); background: transparent; color: var(--k-c-text); border-radius: 0; cursor: pointer;
  font: 700 .82rem/1 var(--k-mono); min-width: 3.2rem; min-height: 32px; font-variant-numeric: tabular-nums; }
.bi2-slot button:hover { background: color-mix(in srgb, var(--k-c) 12%, transparent); }
.bi2-slot button:focus-visible, .bi2-btn:focus-visible { outline: 2px solid var(--k-ink); outline-offset: 2px; }
.bi2-hint { margin: 0; font-size: .86rem; color: var(--k-ink); font-weight: 560; }
.bi2-note, .bi2-pairs { margin: 0; font-size: .82rem; line-height: 1.38; color: var(--k-soft); }
.bi2-pairs { font: 400 .72rem/1.45 var(--k-mono); }
.bi2-tal { margin: 0; font: 400 .8rem/1.4 var(--k-mono); color: var(--k-ink); font-variant-numeric: tabular-nums; }
.bi2-sl { margin: 0 0 -.25rem; font: 700 .58rem/1.3 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--k-soft); }
.bi2-wander { display: block; margin-top: .2rem; font-size: .68rem; color: var(--k-soft); }
.bi2-strip { display: flex; flex-wrap: wrap; gap: 3px; min-height: 10px; }
.bi2-strip i { display: block; width: 8px; height: 8px; border: 1.4px solid var(--k-ink); }
.bi2-col-c .bi2-strip i { border-color: var(--k-c); } .bi2-col-m .bi2-strip i { border-color: var(--k-m); }
.bi2-col-c .bi2-strip i.w { background: var(--k-c); } .bi2-col-m .bi2-strip i.w { background: var(--k-m); }
.bi2-run { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin-top: .9rem; padding-top: .8rem; border-top: 1px solid var(--k-rule); }
.bi2-last { margin: 0; flex: 1 1 20rem; font: 400 .74rem/1.45 var(--k-mono); color: var(--k-soft); font-variant-numeric: tabular-nums; }
.bi2-row { display: flex; flex-wrap: wrap; gap: .4rem; }
.bi2-btn { appearance: none; border: 1px solid var(--k-ink); border-radius: 0; background: transparent; color: var(--k-ink); cursor: pointer;
  font: 700 .64rem/1 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; padding: .55rem .7rem; min-height: 34px; }
.bi2-btn:hover { background: color-mix(in srgb, var(--k-ink) 8%, transparent); }
.bi2-caption { margin: .9rem 0 0; padding-top: .8rem; border-top: 1px solid var(--k-rule); font-size: .92rem; color: var(--k-body); max-width: 52rem; }
.bi2-sr { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
@container (max-width: 44rem) {
  .bi2-grid { grid-template-columns: minmax(0, 1fr); }
  .bi2-card { min-width: 0; flex: 1 1 7.5rem; padding: .45rem .5rem .5rem; }
  .bi2-slot button { min-width: 2.8rem; }
}
@media (forced-colors: active) {
  .bi2 { border-color: CanvasText; }
  .bi2-scale text { fill: CanvasText; stroke: Canvas; }
  .bi2-scale .axis, .bi2-scale .tick, .bi2-scale .c-read, .bi2-scale .c-write, .bi2-scale .c-table, .bi2-scale .tb { stroke: CanvasText; }
  .bi2-scale .td, .bi2-strip i.w { fill: Highlight; background: Highlight; }
  .bi2-scale .ex { stroke: Highlight; fill: Canvas; }
  .bi2-scale .band, .bi2-scale .band-read { fill: Canvas; }
  .bi2-col, .bi2-strip i, .bi2-slot button { border-color: CanvasText; }
  .bi2-seg button[aria-pressed="true"] { forced-color-adjust: none; background: Highlight; color: HighlightText; }
}
@media print {
  .bi2 { --k-paper: #ffffff; --k-ink: #1d1d1b; --k-body: #2a2926; --k-soft: #3c3a36; --k-hair: #8a8a8a; --k-rule: #d6d4cf;
    --k-c: #009fe3; --k-m: #e6007e; --k-c-text: #0072b5; --k-m-text: #c4006b; --k-m-tint: #fdeef6; }
  .bi2, .bi2 * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .bi2-run .bi2-row { display: none; }
}

@media screen and (prefers-color-scheme: dark) { .bi2-scale .band-read { opacity: .17; } }
@container (max-width: 16rem) { .bi2-slot { flex-wrap: wrap; } }