/* The lab: a playable pool for the rounding bug behind RF-01. Loads after /styles.css. */
:root {
  --inset: color-mix(in srgb, var(--fg) 6%, transparent);
  --bug: #9c5b00;
  --bug-tint: rgb(255 197 61 / 0.14);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bug: #e9c786;
    --bug-tint: rgb(233 199 134 / 0.08);
  }
}

.lab-intro {
  width: min(100% - 32px, var(--column));
  margin: clamp(72px, 12vh, 128px) auto 56px;
  color: var(--fg-muted);
}
.lab-intro h1 {
  margin: 0 0 20px;
  font: 500 clamp(34px, 3vw + 20px, 48px) / 1.08 var(--serif);
  letter-spacing: -0.018em;
  color: var(--fg);
  text-wrap: balance;
}
.lab-intro p + p {
  margin-top: 12px;
}
.lab-disclaimer {
  font-size: 14px;
}
.lab-disclaimer a,
.lab-result a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: 24px 28px;
  align-items: start;
  width: min(100% - 32px, 1040px);
  margin-inline: auto;
}
.lab-column {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}
.lab-panel {
  padding: 22px 24px 24px;
  border-radius: 10px;
  background: var(--card);
  box-shadow: var(--shadow);
}
.lab-h2 {
  font: 500 21px/1.25 var(--serif);
  text-wrap: balance;
}
.lab-h2 code {
  font-size: 0.82em;
}
.lab-lede {
  margin-top: 8px;
  font-size: 14px;
  color: var(--fg-muted);
}
.lab-kicker {
  margin-bottom: 10px;
}
.lab-noscript {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-size: 13px;
}

/* The pool sits on the same dark device face as the homepage's desk objects. */
.lab-figure {
  border-radius: 10px;
  background: var(--device);
  color: var(--device-fg);
  box-shadow: var(--shadow);
}
.lab-figure-top {
  display: flex;
  justify-content: space-between;
  padding: 12px 16px 0;
  font: 9px/1.3 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--device-dim);
}
.lab-art {
  display: block;
  width: 100%;
  height: auto;
}
.lab-label {
  font: 9px var(--mono);
  letter-spacing: 0.06em;
  fill: var(--device-dim);
}
.lab-label.is-accent {
  fill: var(--lime);
}
.lab-glyph {
  font: 14px var(--mono);
}
.lab-marker-bug text {
  fill: #e9c786;
}
.lab-marker-fix text,
.lab-paid-label {
  fill: #b4b4ab;
}
.lab-grid[data-fix="on"] .lab-marker-bug,
.lab-grid[data-fix="off"] .lab-marker-fix,
.lab-cap-narrow {
  display: none;
}
.lab-dust,
.lab-ghost,
.lab-paid-label {
  opacity: 0;
}
/* A free swap lifts the top OUT cube out of the pool and leaves its slot as hidden lines. */
.lab-figure[data-state="free"] .lab-slot {
  opacity: 0;
}
.lab-figure[data-state="free"] :is(.lab-dust, .lab-ghost) {
  opacity: 1;
}
.lab-figure[data-state="free"] .lab-dust {
  transform: translateY(-88px);
}
.lab-figure[data-state="paid"] .lab-paid-label {
  opacity: 1;
}
.lab-pool {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 12px 16px 14px;
  border-top: 1px solid #2e2e2b;
  font: 11px/1.6 var(--mono);
}
.lab-pool > div {
  display: grid;
  grid-template-columns: 11ch minmax(0, 1fr);
  gap: 12px;
}
.lab-pool dt {
  color: var(--device-dim);
}
.lab-pool dd {
  display: flex;
  flex-wrap: wrap;
  gap: 0 12px;
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--device-dim);
}
.lab-pool dd span:last-child {
  color: var(--device-fg);
}

/* Controls */
.lab-field {
  margin-top: 20px;
}
.lab-field label,
.lab-check-label {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2px 12px;
  margin-bottom: 8px;
  font: 12px/1.6 var(--mono);
}
.lab-field label span {
  color: var(--fg-subtle);
}
.lab-input {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--paper);
  color: var(--fg);
  font: 16px/1.4 var(--mono);
  font-variant-numeric: tabular-nums;
}
.lab-input[aria-invalid="true"] {
  border-color: var(--fg-muted);
}
.lab-hint {
  min-height: 1.6em;
  margin-top: 8px;
  font: 11px/1.6 var(--mono);
  color: var(--fg-subtle);
  overflow-wrap: anywhere;
}
.lab-hint[data-tone="error"] {
  padding-left: 10px;
  border-left: 2px solid var(--fg);
  color: var(--fg);
}
.lab-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}
.lab-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 0;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--card);
  font-size: 14px;
  line-height: 1.3;
  text-align: center;
  text-wrap: balance;
  cursor: pointer;
  transition:
    background-color 150ms ease,
    transform 120ms ease;
}
.lab-button:active:enabled {
  transform: scale(0.98);
}
.lab-button:disabled {
  cursor: default;
}
/* Without JavaScript the buttons stay disabled; say so visually as well. */
@media (scripting: none) {
  .lab-button:disabled {
    color: var(--fg-subtle);
    background: none;
  }
}
.lab-switch {
  position: relative;
  flex: none;
  width: 26px;
  height: 14px;
  border: 1px solid var(--fg-subtle);
  border-radius: 7px;
}
.lab-switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg-subtle);
}
.lab-toggle[aria-pressed="true"] {
  border-color: var(--fg);
}
.lab-toggle[aria-pressed="true"] .lab-switch {
  border-color: var(--fg);
  background: var(--fg);
}
.lab-toggle[aria-pressed="true"] .lab-switch::after {
  background: var(--bg);
  transform: translateX(12px);
}
.lab-readout {
  display: block;
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--paper);
}
.lab-readout-state {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font: 14px/1.5 var(--mono);
  overflow-wrap: anywhere;
}
.lab-readout-state::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fg-subtle);
  transform: translateY(-2px);
}
.lab-readout[data-state="free"] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}
.lab-readout[data-state="free"] .lab-readout-state {
  color: var(--accent);
}
.lab-readout[data-state="free"] .lab-readout-state::before {
  background: var(--lime);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--lime) 30%, transparent);
}
.lab-readout-detail {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.lab-totals {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 12px 0 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--border);
}
.lab-totals > div {
  min-width: 0;
  padding: 12px 14px;
  background: var(--paper);
}
.lab-totals dt {
  font: 9px/1.6 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.lab-totals dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.lab-total {
  display: block;
  margin-top: 2px;
  font: 500 20px/1.3 var(--serif);
}
.lab-raw {
  display: block;
  font: 11px/1.6 var(--mono);
  color: var(--fg-subtle);
}
.lab-totals .lab-totals-wide {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
}
.lab-totals-wide dd {
  font: 12px/1.6 var(--mono);
}

/* Source: hand-authored tokens, long lines wrap with a hanging indent. */
.lab-source-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}
.lab-code-label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 22px;
  font: 10px/1.6 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.lab-code-label-fix {
  margin-top: 8px;
}
.lab-in-use {
  display: none;
  padding: 1px 7px;
  border-radius: 4px;
  background: var(--inset);
  color: var(--fg);
  letter-spacing: 0.04em;
  text-transform: none;
}
.lab-grid[data-fix="off"] .lab-code-label-bug .lab-in-use {
  display: inline-block;
  background: var(--bug-tint);
  color: var(--bug);
}
.lab-grid[data-fix="on"] .lab-code-label-fix .lab-in-use {
  display: inline-block;
}
.lab-code {
  margin: 0;
  padding: 10px 0;
  border-radius: 6px;
  background: var(--inset);
  font: 12px/1.8 var(--mono);
  color: var(--fg-muted);
  white-space: normal;
}
.lab-code code {
  display: block;
  font: inherit;
  white-space: normal;
}
.ln {
  display: block;
  padding: 0 14px 0 calc(14px + 4ch);
  text-indent: -4ch;
  white-space: pre-wrap;
}
.ln-2 {
  padding-left: calc(14px + 6ch);
  text-indent: -6ch;
}
.ln-4 {
  padding-left: calc(14px + 8ch);
  text-indent: -8ch;
}
.tk-k {
  color: var(--fg-subtle);
}
.tk-f {
  color: var(--fg);
}
.tk-bug {
  color: var(--bug);
}
.nw {
  white-space: nowrap;
}
.ln-bug {
  background: var(--bug-tint);
  box-shadow: inset 2px 0 0 var(--bug);
}
.lab-grid[data-fix="on"] .ln-bug {
  background: none;
  box-shadow: inset 2px 0 0 var(--border-strong);
}
.lab-grid[data-fix="on"] .ln-bug,
.lab-grid[data-fix="on"] .ln-bug span {
  color: var(--fg-subtle);
}
.lab-grid[data-fix="on"] .ln-fix {
  background: color-mix(in srgb, var(--lime) 18%, transparent);
  box-shadow: inset 2px 0 0 var(--accent);
}
.lab-source-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--fg-muted);
}

.lab-impact p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-muted);
}

.lab-check {
  margin-top: 18px;
}
/* The button takes its own full-width row only when the answer would otherwise be squeezed. */
.lab-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.lab-inline .lab-input {
  flex: 999 1 11.5rem;
}
.lab-inline .lab-button {
  flex: 1 0 96px;
  min-height: 48px;
}
.lab-result:not(:empty) {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.lab-result p + p {
  margin-top: 12px;
}
.lab-result > p {
  font-size: 14px;
  overflow-wrap: anywhere;
}
.lab-accepted {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font: 13px/1.6 var(--mono);
}
.lab-accepted .icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}
.lab-flag {
  display: inline-block;
  max-width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--device);
  color: var(--lime);
  font: 14px/1.5 var(--mono);
  overflow-wrap: anywhere;
  user-select: all;
}

.lab-page .footer {
  width: min(100% - 32px, 1040px);
}
.lab-page .footer a:hover {
  color: var(--fg);
}

@media (hover: hover) and (pointer: fine) {
  .lab-button:enabled:hover {
    background: var(--inset);
  }
  .lab-disclaimer a:hover,
  .lab-result a:hover {
    text-decoration-color: currentColor;
  }
}
@media (prefers-reduced-motion: no-preference) {
  .lab-switch::after {
    transition: transform 160ms ease-out;
  }
  .lab-figure.is-lifting .lab-dust {
    animation: lab-lift 260ms cubic-bezier(0.23, 1, 0.32, 1);
  }
  .lab-figure.is-lifting .lab-ghost {
    animation: lab-ghost 260ms ease-out;
  }
  @keyframes lab-ghost {
    from {
      opacity: 0;
    }
  }
  @keyframes lab-lift {
    from {
      opacity: 0;
      transform: translateY(0);
    }
    35% {
      opacity: 1;
    }
    to {
      opacity: 1;
      transform: translateY(-88px);
    }
  }
}
@media (max-width: 900px) {
  .lab-grid {
    grid-template-columns: minmax(0, 1fr);
    width: min(100% - 32px, 620px);
  }
  .lab-page .footer {
    width: min(100% - 32px, 620px);
  }
}
@media (max-width: 480px) {
  .lab-label {
    font-size: 12px;
  }
  .lab-cap-wide {
    display: none;
  }
  .lab-cap-narrow {
    display: inline;
  }
  .lab-panel {
    padding: 20px 16px;
  }
  .lab-button {
    padding-inline: 10px;
  }
  .lab-totals {
    grid-template-columns: minmax(0, 1fr);
  }
  .lab-pool > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
  .lab-readout {
    padding: 12px;
  }
  /* Room for the 31-character division line at 320px, so the "/" stays with its operand. */
  .lab-code {
    font-size: 11px;
  }
  .ln {
    padding-right: 8px;
    padding-left: calc(10px + 4ch);
  }
  .ln-2 {
    padding-left: calc(10px + 6ch);
  }
  .ln-4 {
    padding-left: calc(10px + 8ch);
  }
}