.xor-lab { --one: var(--teal); --one-wash: #28785f12; --miss: #aa4936; --miss-wash: #aa493612; padding: 0 0 6px; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
p { margin: 0; }
button, input { -webkit-tap-highlight-color: transparent; }
button { min-height: 44px; border-radius: 7px; }
.eyebrow, .node-label { font-size: 11px; font-weight: 650; letter-spacing: .09em; color: var(--ink2); }
.eyebrow { margin: 0; }
.lab-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 18px; }
.score-badge { flex: 0 0 auto; border: 1px solid var(--line); border-radius: 40px; padding: 6px 12px; font-size: 14px; font-variant-numeric: tabular-nums; font-weight: 600; }
.score-badge[data-perfect="true"] { color: var(--one); border-color: var(--one); background: var(--one-wash); }
.switch-board { display: grid; grid-template-columns: 1.3fr 32px 1fr; gap: 16px; align-items: center; margin: 22px 0; }
.input-switches { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.bit-switch { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; min-height: 194px; padding: 18px 8px; background: var(--color-background-secondary); }
.bit-switch[aria-pressed="true"] { background: var(--one-wash); border-color: var(--one); color: var(--one); }
.switch-name { font-size: 13px; font-weight: 500; color: var(--ink2); }
.switch-value { font-size: 42px; font-weight: 550; line-height: 1.1; }
.switch-track { position: relative; height: 25px; width: 44px; border-radius: 20px; background: var(--gray); }
.switch-track span { display: block; width: 19px; height: 19px; border-radius: 50%; background: var(--card); position: absolute; top: 3px; left: 3px; transition: transform .15s; }
[aria-pressed="true"] .switch-track { background: var(--one); }
[aria-pressed="true"] .switch-track span { transform: translateX(19px); }
.switch-word { font-size: 10px; font-weight: 650; letter-spacing: .1em; }
.flow-arrow { text-align: center; font-size: 28px; color: var(--ink3); }
.xor-answer { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; min-height: 194px; border: 1px solid var(--line); border-radius: 10px; background: var(--color-background-secondary); }
.xor-answer strong { font-size: 80px; font-weight: 500; line-height: 1.2; }
.xor-answer > :last-child { font-size: 15px; }
.xor-answer[data-value="1"] { background: var(--one-wash); border-color: var(--one); color: var(--one); }
.four-cases { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; }
.case-button { padding: 10px 4px; color: var(--ink2); background: transparent; text-align: center; font-variant-numeric: tabular-nums; }
.case-button[aria-pressed="true"] { color: var(--ink); border-color: var(--ink); background: var(--color-background-secondary); box-shadow: inset 0 -2px var(--ink); }
.case-input { font-size: 15px; letter-spacing: .03em; }
.case-target { display: block; margin-top: 3px; font-size: 12px; color: var(--ink2); }
.small-note { font-size: 12px; color: var(--ink2); line-height: 1.6; }
#switches-scene > .small-note { margin-top: 14px; text-align: center; }
.plot-layout { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(0,1fr); gap: 26px; align-items: center; }
.plot-column { min-width: 0; }
.plot-key { display: flex; flex-wrap: wrap; justify-content: center; gap: 5px 8px; align-items: center; font-size: 11px; color: var(--ink2); margin-top: 4px; }
.key-one, .key-zero { font-size: 18px; line-height: 1; }
.key-one { color: var(--one); }
.key-zero { color: var(--ink2); margin-left: 5px; }
.key-region { display: inline-block; width: 12px; height: 12px; background: var(--one-wash); border: 1px solid var(--one); margin-left: 4px; }
.control-intro { font-size: 17px; line-height: 1.5; margin: 0 0 20px; }
.range-label { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; font-size: 13px; margin-top: 12px; }
.range-label output { color: var(--ink2); font-family: var(--mono); font-size: 12px; }
input[type="range"] { width: 100%; min-height: 32px; margin: 0; accent-color: var(--one); }
.button-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.button-row button { font-size: 12px; padding-inline: 10px; }
.subtle-button { font-size: 12px; padding: 5px 0; border: 0; margin-top: 2px; text-decoration: underline; text-underline-offset: 3px; }
.subtle-button[aria-pressed="true"] { color: var(--one); }
.feedback { font-size: 13px; color: var(--ink2); line-height: 1.6; margin-top: 10px; }
.prediction-strip { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 6px; margin-top: 20px; }
.prediction-cell { text-align: center; border-top: 2px solid var(--line); padding: 10px 2px; font-size: 12px; }
.prediction-cell[data-correct="false"] { border-color: var(--miss); background: var(--miss-wash); }
.prediction-cell b { display: block; font-weight: 500; color: var(--ink2); font-size: 12px; }
.prediction-cell span { display: block; margin-top: 4px; font-size: 13px; }
.prediction-cell em { display: block; font-style: normal; font-size: 11px; margin-top: 4px; color: var(--ink2); }
.prediction-cell[data-correct="false"] em { color: var(--miss); }
.rule-strip { display: flex; flex-wrap: wrap; column-gap: 20px; row-gap: 6px; margin-top: 10px; padding: 14px 16px; background: var(--color-background-secondary); border-radius: 6px; font-size: 14px; }
.rule-label { color: var(--ink2); font-size: 12px; }
.rule-strip .small-note { flex-basis: 100%; }
.mono { font-family: var(--mono); font-size: 12px; }
#line-equation { flex-basis: 100%; }
.plot-bg { fill: var(--color-background-secondary); }
.plot-region { fill: var(--one); fill-opacity: .13; }
.plot-grid { stroke: var(--line); stroke-width: 1; }
.plot-axis { stroke: var(--ink3); stroke-width: 1; }
.plot-boundary { stroke: var(--one); stroke-width: 2; fill: none; }
.plot-boundary.second { stroke-dasharray: 5 4; }
.axis-label { fill: var(--ink2); font: 13px var(--sans); }
.target-dot { stroke-width: 2; }
.target-one { fill: var(--one); stroke: var(--one); }
.target-zero { fill: var(--card); stroke: var(--ink2); }
.target-label { text-anchor: middle; dominant-baseline: central; font: 600 15px var(--sans); fill: var(--ink); }
.target-label.one { fill: var(--card); }
.point-caption { text-anchor: middle; fill: var(--ink2); font: 12px var(--sans); }
.error-ring { fill: none; stroke: var(--miss); stroke-width: 2; stroke-dasharray: 4 3; }
.selection-ring { fill: none; stroke: var(--ink); stroke-width: 1; }
.proof-line { stroke: var(--ink2); stroke-dasharray: 4 4; stroke-width: 1.5; }
.proof-text { text-anchor: middle; font: 12px var(--sans); fill: var(--ink); paint-order: stroke; stroke: var(--card); stroke-width: 5px; stroke-linejoin: round; }
.network-layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); align-items: start; gap: 22px; margin-top: 20px; }
.network-notation { margin-top: 10px; text-align: center; }
.network-trace { text-align: center; }
.sum-node { border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
.sum-node strong { display: block; font-size: 23px; font-weight: 500; margin-top: 3px; }
.branch-lines { display: grid; grid-template-columns: 1fr 1fr; height: 25px; font-size: 20px; color: var(--ink3); line-height: 25px; }
.hidden-nodes { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.neuron { padding: 12px 4px 10px; border: 1px solid var(--line); border-radius: 7px; background: var(--color-background-secondary); display: flex; align-items: center; flex-direction: column; gap: 7px; }
.neuron[data-active="true"] { color: var(--one); border-color: var(--one); background: var(--one-wash); }
.neuron .node-label { font-size: 10px; letter-spacing: .025em; }
.node-rule { display: block; font-size: 11px; color: var(--ink2); }
.node-calc { display: block; font: 11px var(--mono); color: var(--ink2); }
.neuron strong { font-size: 32px; font-weight: 500; line-height: 1.1; }
.node-meaning { font-size: 11px; color: var(--ink2); }
.output-node { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: var(--color-background-secondary); display: flex; align-items: center; flex-direction: column; gap: 7px; }
.output-node strong { font-size: 35px; line-height: 1; font-weight: 500; }
.output-node[data-correct="true"] { border-color: var(--one); background: var(--one-wash); }
.output-node[data-correct="false"] { border-color: var(--miss); background: var(--miss-wash); }
#network-verdict { font-size: 12px; }
.cutoff-controls { margin: 16px 12px 0; }
.network-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.network-actions button { font-size: 12px; }
#activation-toggle[aria-pressed="true"] { color: var(--one); border-color: var(--one); background: var(--one-wash); }
#activation-toggle[aria-pressed="false"] { color: var(--miss); border-color: var(--miss); background: var(--miss-wash); }
#network-scene > .small-note { margin-top: 8px; }
@media(prefers-color-scheme:dark) { .xor-lab { --one-wash: #71c2a311; --miss: #eea08a; --miss-wash: #eea08a11; } }
@media(max-width:560px) {
  .plot-layout, .network-layout { grid-template-columns: minmax(0,1fr); gap: 20px; }
  .plot-column > svg { max-width: 360px; margin-inline: auto; }
  .line-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .control-intro { grid-column: 1/-1; font-size: 15px; margin-bottom: 6px; }
  .control-intro br { display: none; }
  .control-intro br::after { content: ' '; }
  .line-controls label[for="line-angle"] { grid-column: 1; grid-row: 2; }
  .line-controls label[for="line-bias"] { grid-column: 2; grid-row: 2; }
  #line-angle { grid-column: 1; grid-row: 3; }
  #line-bias { grid-column: 2; grid-row: 3; }
  .button-row, .line-controls .feedback { grid-column: 1/-1; }
  .subtle-button { grid-column: 1/-1; text-align: left; justify-self: start; }
  .line-controls .feedback { margin-top: 0; }
  .prediction-strip { margin-top: 14px; }
  .switch-board { gap: 6px; grid-template-columns: 1.3fr 20px 1fr; }
  .input-switches { gap: 6px; }
  .bit-switch { min-height: 168px; padding: 12px 4px; }
  .switch-name { font-size: 11px; }
  .flow-arrow { font-size: 20px; }
  .xor-answer { min-height: 168px; }
  .xor-answer strong { font-size: 62px; }
  .xor-answer > :last-child { font-size: 11px; }
  .four-cases { gap: 5px; }
  .case-input { font-size: 13px; }
  .case-target { font-size: 11px; }
  .cutoff-controls { margin-top: 12px; }
  .network-trace { margin: 0 4px; }
  .neuron .node-label { font-size: 11px; }
  .node-rule, .node-calc { font-size: 12px; }
  .eyebrow { font-size: 10px; letter-spacing: .06em; }
  .score-badge { padding: 5px 9px; font-size: 12px; }
}