:root {
  --ground: #fdfcf8;
  --panel: #ecebe6;
  --ink: #1b1b1f;
  --soft: #63676e;
  --hairline: #dedbd2;
  --brand: #7c3aed;
  --brand-dark: #5b21b6;
  --brand-tint: #f0eafd;
  --blue: #2e6be6;
  --blue-tint: #e9f0fe;
  --amber: #f09d1e;
  --surface: #fff;
  --ui: 'Gabarito', system-ui, sans-serif;
  --mono: 'Spline Sans Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% -10%, rgba(124, 58, 237, .07), transparent 32rem),
    var(--ground);
  font-family: var(--ui);
}

button, input { font: inherit; }
button { color: inherit; }

.lab-shell { width: min(1500px, calc(100% - 40px)); margin: 0 auto; padding: 32px 0 48px; }
.lab-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 28px; }
.lab-header > div:first-child { max-width: 770px; }
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--soft); font: 600 11px/1 var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 4px var(--brand-tint); }
h1 { margin: 14px 0 8px; font-size: clamp(34px, 4.3vw, 62px); line-height: .97; letter-spacing: -.045em; }
h1 span { color: var(--brand); }
.lab-header p { margin: 0; color: var(--soft); font-size: 17px; line-height: 1.5; }
.header-proof { min-width: 245px; padding: 16px 18px 14px; border: 1.5px solid var(--ink); border-bottom: 3px solid var(--ink); background: var(--surface); }
.proof-label, .contract-kicker { display: block; color: var(--soft); font: 600 9px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.header-proof strong { display: block; margin: 7px 0 4px; font: 700 20px/1 var(--mono); }
.header-proof small { color: var(--soft); font: 500 10px/1.35 var(--mono); }

.lab-grid { display: grid; grid-template-columns: 250px minmax(480px, 1fr) 270px; gap: 18px; align-items: start; }
.panel { border: 1px solid var(--hairline); background: rgba(255,255,255,.72); box-shadow: 0 2px 0 #d4d0c7; }
.controls, .inspector { position: sticky; top: 18px; min-height: 620px; padding: 16px; }
.panel-title { display: flex; align-items: center; justify-content: space-between; padding-bottom: 13px; border-bottom: 1px solid var(--hairline); margin-bottom: 17px; }
.panel-title span { font-weight: 700; }
.panel-title i { padding: 4px 6px; border-radius: 3px; background: var(--brand-tint); color: var(--soft); font: normal 600 9px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.control-label { display: flex; justify-content: space-between; margin: 18px 0 8px; color: var(--soft); font: 600 10px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.control-label output { color: var(--ink); }
.segmented, .state-picker { display: flex; gap: 5px; }
.segmented button, .state-picker button { flex: 1; padding: 8px 7px; border: 1px solid var(--hairline); background: transparent; cursor: pointer; font-size: 12px; font-weight: 600; }
.segmented button.active, .state-picker button.active { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.mode-segments button { font-size: 10px; }
.family-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.family-grid button { min-height: 42px; padding: 7px; border: 1px solid var(--hairline); background: transparent; cursor: pointer; font-size: 11px; font-weight: 600; }
.family-grid button.active { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.hand-list { display: grid; gap: 7px; }
.hand-option { display: grid; grid-template-columns: 28px 1fr; gap: 10px; width: 100%; padding: 9px; text-align: left; border: 1px solid transparent; background: transparent; cursor: pointer; }
.hand-option.active { border-color: var(--brand); background: var(--brand-tint); box-shadow: 0 2px 0 #d8c8f5; }
.hand-option b { display: block; font-size: 13px; }
.hand-option small { display: block; margin-top: 3px; color: var(--soft); font-size: 10px; line-height: 1.25; }
.hand-swatch { width: 28px; height: 28px; border: 1.5px solid var(--ink); background: var(--ground); }
.swatch-kiln-exact { box-shadow: inset 0 8px 0 var(--brand-tint), 2px 2px 0 #c8c3ba; }
.swatch-technical-draft { background-image: repeating-linear-gradient(135deg, transparent 0 4px, rgba(27,27,31,.15) 4px 5px); }
.swatch-teacher-sketch { transform: rotate(-2deg); border-radius: 48% 45% 52% 44%; box-shadow: 1px 1px 0 var(--brand); }
.swatch-soft-geometry { border-radius: 9px; background: #e9ddfb; border-color: #7c3aed; }
.swatch-editorial-contrast { border-radius: 0; background: linear-gradient(90deg, #d94f3d 0 50%, #f6c8c1 50%); border-color: #d94f3d; }
.swatch-living-line { border-radius: 50% 42% 48% 45%; background: #dcefe2; border-color: #2f855a; box-shadow: inset -6px -3px 0 #eee8f6; }
input[type='range'] { width: 100%; accent-color: var(--brand); }
.range-labels { display: flex; justify-content: space-between; color: var(--soft); font: 500 9px/1 var(--mono); }
.toggle-row { display: grid; grid-template-columns: 18px 1fr; gap: 9px; align-items: start; margin-top: 20px; padding-top: 15px; border-top: 1px solid var(--hairline); cursor: pointer; }
.toggle-row input { margin: 3px 0 0; accent-color: var(--brand); }
.toggle-row b, .toggle-row small { display: block; }
.toggle-row b { font-size: 12px; }
.toggle-row small { margin-top: 2px; color: var(--soft); font-size: 10px; line-height: 1.3; }
.mode-note { margin-top: 20px; padding: 12px; border-left: 4px solid var(--blue); background: var(--blue-tint); }
.mode-note span { font: 700 9px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.mode-note p { margin: 6px 0 0; color: var(--soft); font-size: 10px; line-height: 1.4; }

.stage-column { min-width: 0; }
.stage-meta { display: flex; align-items: flex-end; justify-content: space-between; gap: 22px; min-height: 103px; margin-bottom: 12px; }
.stage-meta h2 { margin: 8px 0 3px; font-size: clamp(21px, 2.2vw, 30px); line-height: 1.05; letter-spacing: -.025em; }
.stage-meta p { margin: 0; color: var(--soft); font-size: 13px; }
.view-chip { padding: 5px 7px; background: var(--blue-tint); border-left: 4px solid var(--blue); color: var(--ink); font: 700 9px/1 var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.state-picker { flex: 0 0 auto; }
.state-picker button { white-space: nowrap; padding-inline: 10px; }
.lesson-code { flex: 0 0 auto; max-width: 260px; padding: 10px 12px; border: 1px solid var(--hairline); background: var(--surface); color: var(--brand-dark); font: 600 11px/1.35 var(--mono); overflow-wrap: anywhere; }
.stage-wrap { display: grid; place-items: center; min-height: 520px; padding: 22px; overflow: hidden; background: var(--panel); }
.stage-wrap.feedback-wrong { box-shadow: inset 0 0 0 2px var(--soft), 0 2px 0 #d4d0c7; }
.stage-wrap.feedback-correct { box-shadow: inset 0 0 0 2px var(--brand), 0 2px 0 #d4d0c7; }
.figure-svg { display: block; width: 100%; max-height: min(64vh, 650px); aspect-ratio: var(--stage-ratio); touch-action: manipulation; }
.hit-region { cursor: crosshair; outline: none; }
.hit-region:hover, .hit-region:focus { stroke: var(--brand); stroke-width: 1.5; stroke-dasharray: 4 4; }
.scene-shape { vector-effect: non-scaling-stroke; transition: opacity 160ms ease, stroke-width 160ms ease; }
.scene-shape[data-motion] { transform-box: view-box; transform-origin: center; }
.scene-shape[data-motion='enter'] { animation: object-enter 420ms cubic-bezier(.2,.75,.25,1) both; }
.scene-shape[data-motion='move'] { animation: object-move 460ms cubic-bezier(.2,.75,.25,1) both; }
.figure-svg.selection-wrong .scene-shape.is-selected { stroke: var(--soft); }
.figure-svg.selection-correct .scene-shape.is-selected { stroke: var(--brand); }
.debug-bound { fill: rgba(240,157,30,.08); stroke: var(--amber); stroke-width: 1; stroke-dasharray: 3 3; vector-effect: non-scaling-stroke; }
.debug-anchor circle { fill: var(--brand); stroke: var(--ground); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.debug-anchor text { fill: var(--brand-dark); font: 600 8px var(--mono); }
.provenance { display: flex; gap: 9px; align-items: center; margin-top: 10px; color: var(--soft); font: 500 10px/1.3 var(--mono); }
.provenance span { padding: 4px 6px; background: var(--panel); color: var(--ink); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
.warnings { margin-top: 8px; color: var(--ink); font-size: 11px; }
.warnings span { display: block; padding-left: 12px; border-left: 4px solid var(--amber); }

.lesson-console { margin-top: 12px; padding: 15px; background: rgba(255,255,255,.86); }
.lesson-status { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.lesson-status span { display: block; color: var(--soft); font: 600 9px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.lesson-status strong { display: block; margin-top: 5px; font-size: 17px; }
.lesson-status small { padding: 6px 8px; background: var(--ink); color: var(--ground); font: 700 10px/1 var(--mono); }
.checkpoint-track { position: relative; display: grid; grid-template-columns: repeat(var(--checkpoint-count, 3), 1fr); gap: 8px; margin-top: 14px; }
.checkpoint-track::before { content: ''; position: absolute; z-index: 0; top: 13px; left: 16%; right: 16%; height: 1px; background: var(--hairline); }
.checkpoint-track button { position: relative; z-index: 1; display: grid; place-items: center; gap: 5px; border: 0; background: transparent; cursor: pointer; color: var(--soft); font-size: 10px; }
.checkpoint-track i { display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--hairline); border-radius: 50%; background: var(--ground); font: normal 700 10px/1 var(--mono); }
.checkpoint-track button.active { color: var(--ink); font-weight: 700; }
.checkpoint-track button.active i { border-color: var(--brand); background: var(--brand); color: white; box-shadow: 0 0 0 4px var(--brand-tint); }
.checkpoint-track button.complete i { border-color: var(--ink); background: var(--ink); color: white; }
.checkpoint-explanation { margin: 15px 0 0; color: var(--soft); font-size: 12px; line-height: 1.45; }
.challenge { margin-top: 13px; padding: 12px 14px; border-left: 4px solid var(--blue); background: var(--blue-tint); }
.challenge > span { display: block; color: var(--soft); font: 700 9px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.challenge strong { display: block; margin-top: 6px; font-size: 14px; line-height: 1.3; }
.challenge small { display: block; margin-top: 6px; color: var(--soft); }
.challenge.correct { border-color: var(--brand); background: var(--brand-tint); }
.challenge.wrong { border-color: var(--soft); background: var(--panel); }
.playback-controls { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 12px; }
.playback-controls button { min-height: 34px; border: 1px solid var(--hairline); background: var(--ground); cursor: pointer; font-size: 11px; font-weight: 700; }
.playback-controls button.primary { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.playback-controls button:disabled { opacity: .35; cursor: default; }

@keyframes object-enter {
  from { opacity: 0; transform: translate(var(--motion-x), var(--motion-y)) scale(.94); }
  to { opacity: 1; transform: translate(0, 0) scale(1); }
}

@keyframes object-move {
  from { transform: translate(var(--motion-x), var(--motion-y)); }
  to { transform: translate(0, 0); }
}

.empty-inspector { display: grid; place-items: center; min-height: 365px; text-align: center; color: var(--soft); }
.empty-inspector b { color: var(--ink); }
.empty-inspector p { margin: -45px 12px 0; font-size: 12px; line-height: 1.45; }
.crosshair { position: relative; width: 54px; height: 54px; border: 1px solid var(--hairline); border-radius: 50%; }
.crosshair::before, .crosshair::after { content: ''; position: absolute; background: var(--brand); }
.crosshair::before { width: 72px; height: 1px; left: -10px; top: 26px; }
.crosshair::after { width: 1px; height: 72px; left: 26px; top: -10px; }
.selection-id { padding: 11px; background: var(--brand-tint); border-left: 4px solid var(--brand); }
.selection-id span { display: block; color: var(--soft); font: 600 9px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.selection-id strong { display: block; margin-top: 6px; font: 700 15px/1.2 var(--mono); overflow-wrap: anywhere; }
.selection dl { margin: 16px 0 0; }
.selection dt { margin-top: 14px; color: var(--soft); font: 600 9px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.selection dd { display: grid; gap: 5px; margin: 7px 0 0; }
.selection code { padding: 5px 6px; background: var(--panel); font: 500 9px/1.3 var(--mono); overflow-wrap: anywhere; }
.selection em { color: var(--soft); font-size: 11px; }
.relation { padding: 7px; border: 1px solid var(--hairline); }
.relation b, .relation span, .relation small { display: block; }
.relation b { font-size: 11px; }
.relation span { margin: 3px 0; font: 500 8px/1.3 var(--mono); overflow-wrap: anywhere; }
.relation small { color: var(--soft); font-size: 9px; }
.debug-controls { display: flex; gap: 12px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--hairline); color: var(--soft); font: 500 9px/1 var(--mono); }
.debug-controls input { accent-color: var(--brand); vertical-align: -2px; }
.engine-contract { margin-top: 18px; padding: 11px; border: 1px solid var(--hairline); background: var(--ground); }
.engine-contract p { margin: 5px 0 0; color: var(--soft); font-size: 11px; line-height: 1.4; }
.engine-contract code { color: var(--ink); font: 700 10px var(--mono); }

/* Foundation Pack catalogue */
.foundation-shell { width: min(1440px, calc(100% - 48px)); margin: 0 auto; padding: 30px 0 60px; }
.foundation-hero { padding: 5px 0 28px; }
.foundation-nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-bottom: 22px; border-bottom: 1px solid var(--hairline); }
.foundation-actions { display: flex; gap: 8px; }
.foundation-actions button, .foundation-actions a, .foundation-card footer button { padding: 9px 13px; border: 1px solid var(--ink); background: var(--ink); color: var(--ground); cursor: pointer; font-size: 11px; font-weight: 700; text-decoration: none; }
.foundation-actions button:last-child { background: transparent; color: var(--ink); }
.foundation-actions a { background: var(--brand); border-color: var(--brand); color: white; }
.drawing-hands-entry { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin: 0 0 24px; padding: 20px 22px; background: var(--brand); color: white; text-decoration: none; }
.drawing-hands-entry span { display: grid; gap: 4px; }
.drawing-hands-entry b { font-size: 15px; }
.drawing-hands-entry small { max-width: 700px; font-size: 12px; line-height: 1.45; opacity: .82; }
.drawing-hands-entry strong { flex: none; font: 700 12px var(--mono); }
.foundation-headline { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, .5fr); gap: 60px; align-items: end; padding: 42px 0 32px; }
.foundation-headline h1 { margin: 0 0 14px; font-size: clamp(48px, 6.7vw, 96px); }
.foundation-headline p { max-width: 770px; margin: 0; color: var(--soft); font-size: clamp(15px, 1.5vw, 20px); line-height: 1.5; }
.foundation-proof { padding: 20px; border: 1.5px solid var(--ink); border-bottom: 4px solid var(--ink); background: white; }
.foundation-proof > span { display: block; color: var(--soft); font: 600 9px var(--mono); text-transform: uppercase; letter-spacing: .12em; }
.foundation-proof strong { display: block; margin: 10px 0 15px; color: var(--brand); font: 700 clamp(36px, 4vw, 58px)/.95 var(--mono); }
.foundation-proof div { color: var(--soft); font: 500 10px/1.6 var(--mono); }
.foundation-proof b { color: var(--ink); }
.compiler-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; gap: 10px; padding: 15px; border: 1px solid var(--hairline); background: rgba(255,255,255,.7); }
.compiler-flow span { display: flex; gap: 9px; align-items: center; font: 600 11px var(--mono); }
.compiler-flow b { display: grid; place-items: center; flex: 0 0 25px; height: 25px; background: var(--ink); color: white; font-size: 8px; }
.compiler-flow i { color: var(--brand); font: normal 700 16px var(--mono); }
.hand-lock { display: grid; grid-template-columns: minmax(260px, 1fr) minmax(440px, 1.4fr) auto; gap: 30px; align-items: center; margin-bottom: 18px; padding: 18px; background: rgba(255,255,255,.78); }
.hand-lock strong { display: block; margin-top: 5px; font-size: 20px; }
.hand-lock p { margin: 4px 0 0; color: var(--soft); font-size: 11px; line-height: 1.35; }
.variation-control { display: grid; gap: 7px; }
.variation-control > div { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.variation-control button { padding: 7px; border: 1px solid var(--hairline); background: transparent; cursor: pointer; font-size: 10px; font-weight: 700; }
.variation-control button.active { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.variation-control code { width: max-content; padding: 5px 7px; background: var(--panel); font: 600 8px var(--mono); }
.hand-switch { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.hand-switch button { display: grid; grid-template-columns: 26px 1fr; align-items: center; gap: 8px; min-height: 46px; padding: 7px; border: 1px solid var(--hairline); background: transparent; text-align: left; cursor: pointer; }
.hand-switch button.active { border-color: var(--brand); background: var(--brand-tint); }
.hand-switch b { font-size: 11px; }
.evidence-register { margin: 46px 0; padding: 0; background: transparent; }
.evidence-register > header { display: block; max-width: 680px; margin-bottom: 18px; }
.evidence-register h2 { margin: 6px 0 3px; font-size: 26px; }
.evidence-register header p { margin: 0; color: var(--soft); font-size: 12px; }
.surface-switch { display: flex; gap: 5px; }
.surface-switch button { padding: 8px 11px; border: 1px solid var(--hairline); background: transparent; cursor: pointer; font-size: 10px; font-weight: 700; }
.surface-switch button.active { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.evidence-grid { display: grid; grid-template-columns: minmax(0, 1fr); width: min(100%, 820px); gap: 12px; }
.evidence-grid article { min-width: 0; border: 1px solid var(--hairline); background: var(--panel); }
.evidence-grid article > span { display: block; padding: 8px 10px; border-bottom: 1px solid var(--hairline); background: var(--ground); font: 700 8px var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.evidence-grid article > div { padding: 4px; }
.evidence-grid .figure-svg { max-height: 540px; }
.evidence-register [data-object-id^="artifact.runner.sheet"] { animation: runner-sheet-in 280ms cubic-bezier(.2,.8,.2,1) both; }
@keyframes runner-sheet-in { from { opacity: 0; transform: translateY(90px); } to { opacity: 1; transform: translateY(0); } }
.runtime-contract { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 28px; align-items: center; margin-bottom: 18px; padding: 20px; background: var(--ink); color: var(--ground); }
.runtime-contract h2 { margin: 6px 0 3px; font-size: 25px; }
.runtime-contract p { margin: 0; color: #c9c6bd; font-size: 11px; line-height: 1.4; }
.runtime-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.runtime-stats span { padding: 8px; border: 1px solid #49494d; font: 600 9px var(--mono); }
.runtime-stats b { color: #a78bfa; font-size: 16px; }
.program-fingerprints { display: grid; gap: 4px; }
.program-fingerprints code { color: #c9c6bd; font: 500 8px var(--mono); overflow-wrap: anywhere; }
.foundation-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.foundation-card { min-width: 0; overflow: hidden; background: rgba(255,255,255,.82); }
.foundation-card:last-child:nth-child(odd) { grid-column: 1 / -1; }
.foundation-card > header { display: flex; justify-content: space-between; gap: 16px; padding: 18px 18px 14px; }
.foundation-card > header span { color: var(--soft); font: 700 9px var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.foundation-card h2 { margin: 7px 0 3px; font-size: 25px; letter-spacing: -.02em; }
.foundation-card header p { margin: 0; color: var(--soft); font-size: 12px; }
.foundation-card header > code { flex: 0 0 auto; height: max-content; padding: 5px 7px; background: var(--brand-tint); color: var(--brand-dark); font: 700 9px var(--mono); }
.foundation-stage { display: grid; place-items: center; min-height: 390px; padding: 14px; border-block: 1px solid var(--hairline); background: var(--panel); }
.foundation-stage .figure-svg { max-height: 430px; }
.foundation-card footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 18px; color: var(--soft); font: 500 10px var(--mono); }
.foundation-card footer b { color: var(--ink); }
.foundation-card details { border-top: 1px solid var(--hairline); }
.foundation-card summary { padding: 12px 18px; cursor: pointer; color: var(--soft); font: 600 10px var(--mono); }
.source-proof { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 18px 10px; }
.source-proof span { padding: 4px 6px; background: var(--brand-tint); color: var(--brand-dark); font: 700 8px var(--mono); }
.foundation-card pre { max-height: 350px; margin: 0; padding: 18px; overflow: auto; background: var(--ink); color: #f4f1e9; font: 500 9px/1.55 var(--mono); }
.constitution { display: grid; grid-template-columns: 1.1fr .65fr 1.4fr; gap: 32px; align-items: center; margin-top: 18px; padding: 24px; background: white; }
.constitution h2 { margin: 7px 0 5px; font-size: 25px; }
.constitution p { margin: 0; color: var(--soft); font-size: 12px; line-height: 1.45; }
.token-stack { display: grid; gap: 9px; }
.token-stack span { display: flex; align-items: center; gap: 9px; font: 600 10px var(--mono); }
.token-dot { width: 15px; height: 15px; border-radius: 50%; }
.token-purple { background: var(--brand); }.token-blue { background: var(--blue); }.token-amber { background: var(--amber); }
.token-line { width: 24px; height: 2px; background: var(--ink); }
.primitive-cloud { display: flex; flex-wrap: wrap; gap: 5px; }
.primitive-cloud code { padding: 5px 6px; border: 1px solid var(--hairline); background: var(--ground); color: var(--soft); font: 500 8px var(--mono); }

@media (max-width: 1120px) {
  .lab-grid { grid-template-columns: 220px minmax(470px, 1fr); }
  .inspector { position: static; grid-column: 1 / -1; min-height: 0; }
  .empty-inspector { min-height: 160px; }
  .empty-inspector p { margin: 0; }
}

@media (max-width: 780px) {
  .lab-shell { width: min(100% - 24px, 680px); padding-top: 20px; }
  .lab-header { display: block; }
  .header-proof { margin-top: 18px; }
  .lab-grid { display: flex; flex-direction: column; }
  .controls, .inspector { position: static; width: 100%; min-height: 0; }
  .stage-column { order: -1; width: 100%; }
  .stage-meta { display: block; }
  .state-picker { margin-top: 12px; overflow-x: auto; }
  .lesson-code { display: block; max-width: none; margin-top: 12px; }
  .stage-wrap { min-height: 0; padding: 8px; }
  .figure-svg { max-height: none; }
  .provenance { align-items: flex-start; }
  .playback-controls { grid-template-columns: repeat(2, 1fr); }
  .foundation-shell { width: min(100% - 20px, 680px); padding-top: 18px; }
  .foundation-nav, .foundation-card footer { align-items: flex-start; }
  .foundation-headline { grid-template-columns: 1fr; gap: 25px; padding-top: 32px; }
  .foundation-headline h1 { font-size: clamp(43px, 13vw, 70px); }
  .compiler-flow { grid-template-columns: 1fr; }
  .compiler-flow i { transform: rotate(90deg); justify-self: center; }
  .hand-lock, .constitution { grid-template-columns: 1fr; gap: 18px; }
  .evidence-register > header { display: grid; }
  .evidence-grid { grid-template-columns: 1fr; }
  .runtime-contract { grid-template-columns: 1fr; }
  .hand-switch { grid-template-columns: 1fr; }
  .foundation-grid { grid-template-columns: 1fr; }
  .foundation-card:last-child:nth-child(odd) { grid-column: auto; }
  .foundation-stage { min-height: 0; padding: 5px; }
}

@media (max-width: 480px) {
  .foundation-nav, .foundation-actions, .foundation-card > header, .foundation-card footer { display: grid; }
  .foundation-actions { grid-template-columns: repeat(3, 1fr); }
  .drawing-hands-entry { align-items: flex-start; flex-direction: column; }
  .foundation-card > header > code { width: max-content; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

/* Go lesson reading surface: the code and its captured result are evidence; the
   figure below is the compact semantic explanation, never decoration. */
.go-lesson-shell { width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 22px 0 56px; display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 48px; }
.go-lesson-nav { grid-column: 1 / -1; display: flex; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--hairline); color: var(--soft); font: 600 10px var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.go-lesson-nav a { color: var(--ink); text-decoration: none; }
.go-lesson-list { position: sticky; top: 18px; align-self: start; }
.go-lesson-list h1 { margin: 13px 0 25px; font-size: 43px; }.go-lesson-list h1 em { color: var(--brand); font-style: normal; }
.go-lesson-list button { display: grid; gap: 5px; width: 100%; padding: 14px; border: 1px solid var(--hairline); border-bottom: 0; background: rgba(255,255,255,.65); text-align: left; cursor: pointer; }
.go-lesson-list button:last-child { border-bottom: 1px solid var(--hairline); }.go-lesson-list button.active { background: var(--ink); color: white; border-color: var(--ink); }
.go-lesson-list button small { font: 600 8px var(--mono); letter-spacing: .1em; text-transform: uppercase; opacity: .72; }.go-lesson-list button b { font-size: 14px; }.go-lesson-list button span { color: var(--soft); font-size: 10px; line-height: 1.35; }.go-lesson-list button.active span { color: #c9c6bd; }
.go-lesson-stage { min-width: 0; }.go-lesson-progress { display: flex; justify-content: space-between; color: var(--soft); font: 700 9px var(--mono); text-transform: uppercase; letter-spacing: .1em; }.go-lesson-copy { margin: 13px 0 19px; }.go-lesson-copy h2 { margin: 8px 0 6px; font-size: clamp(31px, 4vw, 47px); line-height: .99; letter-spacing: -.045em; }.go-lesson-copy p { max-width: 650px; margin: 0; color: var(--soft); font-size: 15px; line-height: 1.5; }
.go-code-evidence { display: grid; grid-template-columns: 1.25fr .75fr; gap: 12px; margin: 18px 0; }.go-code-evidence section { overflow: hidden; border: 1px solid #34343b; background: #1b1b1f; }.go-code-evidence header { display: flex; justify-content: space-between; padding: 9px 12px; border-bottom: 1px solid #3f3f47; color: #c9c6bd; font: 700 9px var(--mono); text-transform: uppercase; letter-spacing: .08em; }.go-code-evidence header i { color: #b99bf6; font-style: normal; }.go-code-evidence pre { margin: 0; padding: 14px; overflow: auto; color: #f4f1e9; font: 500 11px/1.6 var(--mono); white-space: pre-wrap; }.go-code-evidence .go-output { background: #111119; }.go-output pre { color: #b9d4ff; }
.go-lesson-figure { border: 1px solid var(--hairline); background: var(--panel); padding: 14px; }.go-figure-note { display: flex; justify-content: space-between; gap: 14px; padding: 0 3px 10px; color: var(--soft); font: 500 9px var(--mono); }.go-figure-note b { color: var(--ink); font-size: 10px; }.go-lesson-figure .figure-svg { max-height: 490px; }
.go-lesson-stage footer { display: flex; justify-content: space-between; margin-top: 15px; }.go-lesson-stage footer button { min-width: 108px; padding: 11px 16px; border: 1px solid var(--ink); background: transparent; cursor: pointer; font-weight: 700; }.go-lesson-stage footer [data-next] { background: var(--ink); color: var(--ground); }.go-lesson-stage footer button:disabled { opacity: .32; cursor: default; }
@media (max-width: 780px) { .go-lesson-shell { display: block; width: min(100% - 22px, 680px); padding-top: 16px; }.go-lesson-nav { margin-bottom: 22px; }.go-lesson-nav span { display: none; }.go-lesson-list { position: static; margin-bottom: 26px; }.go-lesson-list h1 { font-size: 36px; margin-bottom: 16px; }.go-lesson-list { display: grid; grid-template-columns: 1fr; }.go-code-evidence { grid-template-columns: 1fr; }.go-figure-note { display: block; }.go-figure-note span { display: block; margin-top: 4px; }.go-lesson-figure { padding: 7px; } }

/* ---------------------------------------------------------------- Go lessons
   Scene-by-scene lesson surface. Additive: nothing above is changed. Text law:
   all running text is ink or soft ink; state arrives through the violet rail
   marker and the taught-element tint inside the compiled figure only. */
.lsn-shell { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 20px 0 64px; }
.lsn-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--hairline); }
.lsn-back { color: var(--ink); font: 600 12px var(--ui); text-decoration: none; }
.lsn-toolchain { color: var(--soft); font: 500 11px var(--mono); }

.lsn-lessons { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 18px 0 22px; }
.lsn-lessons button { display: grid; gap: 4px; padding: 12px 13px; border: 1px solid var(--hairline); border-radius: 3px; background: var(--surface); text-align: left; cursor: pointer; }
.lsn-lessons button.is-current { border-color: var(--ink); box-shadow: 0 2px 0 var(--ink); }
.lsn-lessons small { color: var(--soft); font: 700 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.lsn-lessons b { font-size: 15px; letter-spacing: -.02em; }
.lsn-lessons span { color: var(--soft); font-size: 12px; line-height: 1.4; }

.lsn-rail { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.lsn-rail button { display: inline-flex; align-items: center; gap: 7px; padding: 7px 11px 7px 8px; border: 1px solid var(--hairline); border-radius: 999px; background: var(--surface); color: var(--ink); cursor: pointer; }
.lsn-rail button i { display: grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--panel); font: 700 11px var(--mono); font-style: normal; }
.lsn-rail button span { font: 600 12px var(--ui); letter-spacing: .01em; }
.lsn-rail button.is-done i { background: var(--brand-tint); color: var(--brand-dark); }
.lsn-rail button.is-current { border-color: var(--ink); box-shadow: 0 2px 0 var(--ink); }
.lsn-rail button.is-current i { background: var(--brand); color: #fff; }

.lsn-progress { display: flex; justify-content: space-between; color: var(--soft); font: 700 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.lsn-copy { margin: 12px 0 20px; }
.lsn-stage-label { color: var(--soft); font: 700 11px var(--mono); letter-spacing: .14em; text-transform: uppercase; white-space: nowrap; overflow: hidden; }
.lsn-copy h1 { max-width: 18ch; margin: 10px 0 8px; font-size: clamp(28px, 4.4vw, 44px); line-height: 1.02; letter-spacing: -.04em; }
.lsn-copy p { max-width: 62ch; margin: 0; color: var(--soft); font-size: 15px; line-height: 1.5; }

.lsn-evidence { display: grid; grid-template-columns: 1fr; gap: 10px; margin-bottom: 12px; align-items: start; }
.lsn-card { overflow: hidden; border: 1px solid var(--hairline); border-radius: 3px; background: var(--surface); }
.lsn-card header { display: flex; justify-content: space-between; gap: 10px; padding: 8px 11px; border-bottom: 1px solid var(--hairline); background: var(--panel); color: var(--ink); font: 700 11px var(--mono); }
.lsn-card header i { color: var(--soft); font-style: normal; font-weight: 500; text-transform: uppercase; letter-spacing: .08em; }
.lsn-card pre { margin: 0; padding: 12px; max-height: 340px; overflow-y: auto; color: var(--ink); font: 500 12px/1.55 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; tab-size: 2; }
.lsn-card pre span { display: block; min-height: 1.55em; padding-left: 18px; text-indent: -18px; }
.lsn-card-output pre { color: var(--ink); }
.lsn-card-output header { background: var(--brand-tint); }

.lsn-determinism, .lsn-why, .lsn-provenance { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 12px; padding: 10px 12px; border: 1px solid var(--hairline); border-radius: 3px; margin-bottom: 12px; background: var(--surface); }
.lsn-determinism b, .lsn-why b, .lsn-provenance b { color: var(--soft); font: 700 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.lsn-determinism span, .lsn-why span, .lsn-provenance span { color: var(--ink); font-size: 12.5px; line-height: 1.5; }
.lsn-provenance span { color: var(--soft); font-family: var(--mono); font-size: 11px; }

.lsn-figure { margin: 0 0 12px; padding: 14px; border: 1px solid var(--hairline); border-radius: 3px; background: var(--panel); }
.lsn-figure figcaption { display: grid; gap: 3px; margin-bottom: 12px; }
.lsn-figure figcaption b { font-size: 14px; letter-spacing: -.01em; }
.lsn-figure figcaption span { color: var(--soft); font-size: 12px; line-height: 1.45; }
.lsn-plate { max-width: 100%; margin: 0 auto; }
.lsn-plate .figure-svg { display: block; width: 100%; height: auto; }
.lsn-figure-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 11px; color: var(--soft); font: 500 11px var(--mono); }
.lsn-figure-meta code { color: var(--ink); font-family: var(--mono); }
.lsn-warnings { display: grid; gap: 5px; margin-bottom: 12px; }
.lsn-warnings span { padding: 8px 11px; border: 1px solid var(--hairline); border-left: 3px solid var(--amber); border-radius: 3px; background: var(--surface); color: var(--ink); font: 500 11.5px/1.45 var(--mono); }

.lsn-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 18px; }
.lsn-actions button { min-width: 132px; padding: 12px 18px; border: 1px solid var(--ink); border-radius: 3px; background: transparent; font-weight: 700; cursor: pointer; }
.lsn-actions .is-primary { background: var(--ink); color: var(--ground); box-shadow: 0 2px 0 var(--brand-dark); }
.lsn-actions button:disabled { opacity: .3; cursor: default; box-shadow: none; }

@media (max-width: 780px) {
  .lsn-shell { width: calc(100% - 24px); padding-top: 14px; }
  .lsn-lessons { grid-template-columns: 1fr; }
  .lsn-evidence { grid-template-columns: 1fr; }
  .lsn-determinism, .lsn-why, .lsn-provenance { grid-template-columns: 1fr; gap: 5px; }
  .lsn-copy h1 { max-width: none; }
  .lsn-figure { padding: 9px; }
  .lsn-rail button span { display: none; }
  .lsn-rail button { padding: 6px; }
}

/* Lessons index inside the foundation catalogue. Additive. */
.lesson-library { margin: 34px 0; }
.lesson-library-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 16px; }
.lesson-library-head h2 { margin: 10px 0 6px; font-size: clamp(24px, 3vw, 34px); letter-spacing: -.035em; }
.lesson-library-head p { max-width: 62ch; margin: 0; color: var(--soft); font-size: 14px; line-height: 1.5; }
.lesson-library-head button { padding: 12px 18px; border: 1px solid var(--ink); border-radius: 3px; background: var(--ink); color: var(--ground); font-weight: 700; cursor: pointer; box-shadow: 0 2px 0 var(--brand-dark); }
.lesson-library-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; }
.lesson-library-card { display: grid; gap: 12px; padding: 14px; }
.lesson-library-card header span { color: var(--soft); font: 700 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.lesson-library-card h3 { margin: 8px 0 5px; font-size: 19px; letter-spacing: -.02em; }
.lesson-library-card p { margin: 0; color: var(--soft); font-size: 13px; line-height: 1.45; }
.lesson-library-stage { border: 1px solid var(--hairline); border-radius: 3px; background: var(--panel); padding: 8px; }
.lesson-library-stage .figure-svg { display: block; width: 100%; height: auto; }
.lesson-library-beats { display: grid; gap: 4px; margin: 0; padding: 0; list-style: none; }
.lesson-library-beats button { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 10px; width: 100%; padding: 7px 9px; border: 1px solid var(--hairline); border-radius: 3px; background: var(--surface); text-align: left; cursor: pointer; }
.lesson-library-beats b { color: var(--soft); font: 700 10.5px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.lesson-library-beats span { color: var(--ink); font-size: 12.5px; line-height: 1.35; }
@media (max-width: 780px) { .lesson-library-head { display: block; } .lesson-library-head button { margin-top: 14px; } }