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42%)}._5l0SBq_labHeader{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:1rem;padding:clamp(.8rem,2vw,1.2rem) clamp(.9rem,3vw,1.7rem) .55rem;display:grid}._5l0SBq_labHeader>div:first-child{min-width:0}._5l0SBq_labHeader p{color:var(--pfb-blue-dark);letter-spacing:.12em;text-transform:uppercase;margin:0 0 .35rem;font-size:.72rem;font-weight:900}._5l0SBq_labHeader h2{color:var(--pfb-ink);letter-spacing:0;overflow-wrap:anywhere;margin:0;font-size:clamp(1.55rem,4vw,2.45rem);font-weight:950;line-height:1.03}._5l0SBq_historyControls{flex-wrap:wrap;justify-content:flex-end;gap:.55rem;min-width:0;display:flex}._5l0SBq_historyControls button,._5l0SBq_primaryControl,._5l0SBq_secondaryControl,._5l0SBq_symbolButton,._5l0SBq_ideaButton,._5l0SBq_pieceHitTarget{font:inherit;-webkit-tap-highlight-color:transparent}._5l0SBq_historyControls button{min-width:4.8rem;min-height:2.9rem;color:var(--pfb-ink);cursor:pointer;background:#ffffffc7;border:1px solid #387c8c4d;border-radius:.9rem;padding:.55rem .8rem;font-weight:850;box-shadow:0 6px 17px #1f4e5c14}._5l0SBq_historyControls button:disabled{color:#5b7280;opacity:1;cursor:not-allowed;box-shadow:none;background:#eef5f6;border-color:#b8c8cf}._5l0SBq_progressWrap{width:min(100% - 2rem,52rem);margin:0 auto .65rem}._5l0SBq_progressText{color:var(--pfb-muted);justify-content:space-between;align-items:center;margin-bottom:.3rem;font-size:.72rem;font-weight:800;display:flex}._5l0SBq_progressText strong{color:var(--pfb-blue-dark)}._5l0SBq_progress{grid-template-columns:repeat(7,minmax(0,1fr));margin:0;padding:0;list-style:none;display:grid;position:relative}._5l0SBq_progress:before{content:"";background:#4a8f9e2e;border-radius:3px;height:3px;position:absolute;top:.9rem;left:7%;right:7%}._5l0SBq_progress li{z-index:1;color:var(--pfb-muted);text-align:center;justify-items:center;gap:.3rem;display:grid}._5l0SBq_progress li>span{color:#5a7884;background:#f8fcfc;border:2px solid #bddde4;border-radius:50%;place-items:center;width:1.85rem;height:1.85rem;font-size:.68rem;font-weight:900;display:grid}._5l0SBq_progress li small{font-size:.66rem;font-weight:800;line-height:1.1}._5l0SBq_progress ._5l0SBq_done>span{border-color:var(--pfb-green);color:#fff;background:var(--pfb-green)}._5l0SBq_progress ._5l0SBq_current{color:var(--pfb-ink)}._5l0SBq_progress ._5l0SBq_current>span{border-color:var(--pfb-blue-dark);color:var(--pfb-blue-dark);background:#fff;box-shadow:0 0 0 5px #1aa4c226}._5l0SBq_labCanvas{overflow-anchor:none;background:linear-gradient(#ffffffb8,#ffffffb8),repeating-linear-gradient(0deg,#0000 0 31px,#2a74860d 31px 32px),repeating-linear-gradient(90deg,#0000 0 31px,#2a74860d 31px 32px),#f1fafb;border:1px solid #458c9c52;border-radius:clamp(1.15rem,3vw,1.7rem);justify-items:center;gap:clamp(.6rem,1.4vw,.82rem);margin:0 clamp(.5rem,2.5vw,1.4rem);padding:clamp(.75rem,1.8vw,1.05rem);display:grid;overflow:hidden;box-shadow:inset 0 1px #fff,0 16px 45px #1f505f17}._5l0SBq_prompt{text-align:center;justify-items:center;gap:.25rem;max-width:42rem;display:grid}._5l0SBq_prompt>span{color:var(--pfb-blue-dark);letter-spacing:.11em;text-transform:uppercase;font-size:.7rem;font-weight:900}._5l0SBq_prompt h3{color:var(--pfb-ink);letter-spacing:0;margin:0;font-size:clamp(1.4rem,3.4vw,2.15rem);font-weight:950;line-height:1.04}._5l0SBq_prompt h3:focus{outline:none}._5l0SBq_prompt p{color:var(--pfb-muted);margin:0;font-size:clamp(.92rem,2vw,1.06rem);line-height:1.35}._5l0SBq_viewport{background:radial-gradient(circle at 28% 42%,#cff3f894,#0000 27%),radial-gradient(circle at 74% 44%,#ffebcb6e,#0000 25%),linear-gradient(160deg,#ffffffd6,#eef8f9c7);border:1px solid #2a7a8d2e;border-radius:clamp(1rem,2.5vw,1.45rem);width:min(100%,clamp(52rem,72vw,60rem));min-width:0;position:relative;overflow:hidden;box-shadow:inset 0 1px #fff,inset 0 -18px 42px #2d71810a,0 13px 31px #1c4c5a14}._5l0SBq_stageVisual{align-content:center;justify-items:center;gap:clamp(.75rem,1.4vw,1rem);width:100%;min-height:clamp(17.75rem,29vw,23.25rem);display:grid}._5l0SBq_stageVisualStacked ._5l0SBq_viewport{width:min(100%,42rem)}._5l0SBq_scene{width:100%;height:100%;display:block}._5l0SBq_viewport[data-layout=mobile] ._5l0SBq_zoneLabels text{letter-spacing:1.5px;font-size:14px}._5l0SBq_viewport[data-layout=mobile] ._5l0SBq_sceneCaptions text{font-size:16px}._5l0SBq_workspaceGrid path{fill:none;stroke:#2d77881a;stroke-dasharray:6 12;stroke-width:2px}._5l0SBq_workspaceGrid circle{fill:none;stroke:#2d778812;stroke-width:2px}._5l0SBq_zoneLabels text,._5l0SBq_sceneCaptions text{fill:var(--pfb-muted);text-anchor:middle;font-family:inherit}._5l0SBq_zoneLabels text{letter-spacing:2.3px;font-size:12px;font-weight:900}._5l0SBq_sceneCaptions text{font-size:15px;font-weight:850}._5l0SBq_dockDepth{fill:#31718017}._5l0SBq_dockSurfaceActive{fill:#e6fafdc7;stroke:var(--pfb-blue);stroke-dasharray:9 10;stroke-width:4px}._5l0SBq_dockMagnetActive{fill:none;stroke:var(--pfb-blue-dark);stroke-linecap:round;stroke-width:5px;opacity:.52}._5l0SBq_wholeObject{animation:.52s cubic-bezier(.2,.85,.2,1) both _5l0SBq_objectArrive}._5l0SBq_objectOutline,._5l0SBq_pieceTop,._5l0SBq_pieceSide{stroke:var(--pfb-ink);stroke-linecap:round;stroke-linejoin:round;stroke-width:3.5px;vector-effect:non-scaling-stroke}._5l0SBq_objectShine{fill:#ffffff61;pointer-events:none;transform-origin:50%;transform:rotate(-18deg)}._5l0SBq_predictionLine{fill:none;stroke:#ffffffd1;stroke-dasharray:9 9;stroke-linecap:round;stroke-width:5px;animation:1.8s ease-in-out infinite _5l0SBq_lineBreathe}._5l0SBq_partitionedObject{filter:drop-shadow(0 13px 11px #11455429)}._5l0SBq_pieceSide{opacity:.98}._5l0SBq_pieceTop{transition:filter .18s}._5l0SBq_objectRing{fill:none;stroke:var(--pfb-ink);stroke-width:4.2px;vector-effect:non-scaling-stroke}._5l0SBq_missingPiece{stroke:#1c66796b;stroke-dasharray:8 7;stroke-linejoin:round;stroke-width:3px;vector-effect:non-scaling-stroke}._5l0SBq_splitReveal{opacity:0;transform-box:fill-box;transform-origin:50%;animation:.48s cubic-bezier(.2,.86,.22,1) forwards _5l0SBq_splitReveal;animation-delay:calc(var(--piece-index) * 55ms)}._5l0SBq_movingPiece{will-change:transform;transition:transform .54s cubic-bezier(.2,.86,.22,1)}._5l0SBq_movablePiece ._5l0SBq_selectedEdge{stroke:#fff;stroke-width:5px;filter:drop-shadow(0 0 7px #08728db3)}._5l0SBq_movingPiece._5l0SBq_isDragging{transition:none}._5l0SBq_selectedEdge{stroke:#ffffffd1;stroke-width:3px;vector-effect:non-scaling-stroke}._5l0SBq_pieceHitTarget{top:var(--hit-top);left:var(--hit-left);width:var(--hit-size-x);height:var(--hit-size-y);cursor:grab;touch-action:none;background:0 0;border:3px solid #0000;border-radius:50%;padding:0;position:absolute}._5l0SBq_pieceHitTarget:hover{background:radial-gradient(circle,#0000 58%,#1aa4c214);border-color:#08728d47}._5l0SBq_pieceHitTarget._5l0SBq_hitDragging{cursor:grabbing}._5l0SBq_pieceHitTarget:focus-visible{outline-offset:4px;border-color:#fff;outline:5px solid #7c3aed}._5l0SBq_controlDock{flex-wrap:wrap;justify-content:center;align-items:center;gap:.7rem;width:min(100%,48rem);min-height:3.3rem;display:flex}._5l0SBq_primaryControl,._5l0SBq_secondaryControl,._5l0SBq_ideaButton{cursor:pointer;border-radius:.95rem;justify-content:center;align-items:center;min-height:3.15rem;padding:.7rem 1.15rem;font-weight:900;line-height:1.18;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex}._5l0SBq_primaryControl{color:#fff;background:linear-gradient(145deg,#1dafcc,#087892);border:1px solid #066a83;box-shadow:0 7px #065a6e,0 13px 24px #085b712e}._5l0SBq_secondaryControl,._5l0SBq_ideaButton{color:var(--pfb-ink);background:#ffffffe6;border:1px solid #35778757;box-shadow:0 5px #487e8b2b,0 11px 20px #1d4c5a14}._5l0SBq_primaryControl:active,._5l0SBq_secondaryControl:active,._5l0SBq_ideaButton:active{transform:translateY(3px);box-shadow:0 2px #065a6e,0 7px 12px #085b711c}._5l0SBq_keyboardGuide{color:var(--pfb-muted);text-align:center;margin:0;font-size:.76rem;font-weight:700;line-height:1.35}@media (hover:none),(pointer:coarse),(max-width:700px){._5l0SBq_keyboardGuide{display:none}}._5l0SBq_comparisonRail,._5l0SBq_barExtension{background:linear-gradient(145deg,#ffffffe0,#eef8f9cc);border:1px solid #3f849438;border-radius:1.25rem;align-items:center;width:min(100%,59rem);padding:clamp(1rem,2.2vw,1.35rem);animation:.44s cubic-bezier(.2,.84,.22,1) both _5l0SBq_railArrive;display:grid;box-shadow:0 14px 31px #1c4c5a17,inset 0 1px #fff}._5l0SBq_comparisonRail{grid-template-columns:minmax(0,1fr) auto minmax(0,1.25fr) auto minmax(0,1fr);gap:clamp(.7rem,2vw,1.15rem);min-height:16rem}._5l0SBq_comparisonRail>div,._5l0SBq_barExtension>div{justify-items:center;gap:clamp(.7rem,1.2vw,.9rem);min-width:0;padding:clamp(.25rem,1vw,.5rem);display:grid}._5l0SBq_comparisonRail>div>span,._5l0SBq_barExtension>div>span{color:var(--pfb-muted);letter-spacing:.08em;text-align:center;text-transform:uppercase;margin-bottom:.05rem;font-size:.68rem;font-weight:900;line-height:1.25}._5l0SBq_comparisonRail>div>strong{color:var(--pfb-ink);margin-top:.25rem;font-size:.85rem}._5l0SBq_comparisonRail>i,._5l0SBq_barExtension>i{color:var(--pfb-green);font-size:1.35rem;font-style:normal;font-weight:950}._5l0SBq_miniCircle{filter:drop-shadow(0 7px 6px #1c4c5a1f);width:min(100%,8.2rem)}._5l0SBq_miniSelected{fill:#42b8cf;stroke:var(--pfb-ink);stroke-width:2.5px}._5l0SBq_miniEmpty{fill:var(--pfb-paper);stroke:var(--pfb-ink);stroke-width:2.5px}._5l0SBq_miniOutline{fill:none;stroke:var(--pfb-ink);stroke-width:3px}._5l0SBq_barModel{filter:drop-shadow(0 7px 6px #1c4c5a1f);width:min(100%,14.5rem);display:block}._5l0SBq_barDepth{fill:#0c6b82;stroke:var(--pfb-ink);stroke-width:2.5px}._5l0SBq_barSurface{fill:var(--pfb-paper)}._5l0SBq_barPart{stroke:none}._5l0SBq_barDivider{stroke:var(--pfb-ink);stroke-width:2.5px}._5l0SBq_barOutline{fill:none;stroke:var(--pfb-ink);stroke-width:3px}._5l0SBq_diagonalModel{filter:drop-shadow(0 7px 6px #1c4c5a1f);width:min(100%,10rem)}._5l0SBq_diagonalFill{fill:#42b8cf}._5l0SBq_diagonalOutline{fill:var(--pfb-paper);fill-opacity:.18;stroke:var(--pfb-ink);stroke-linejoin:round;stroke-width:4px}._5l0SBq_diagonalDivider{fill:none;stroke:var(--pfb-ink);stroke-width:3px}._5l0SBq_barExtension{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:clamp(.9rem,2vw,1.25rem);width:min(100%,43rem)}._5l0SBq_symbolControls,._5l0SBq_explanationControls{flex-wrap:wrap;justify-content:center;align-items:center;gap:.75rem;width:100%;display:flex}._5l0SBq_symbolControls>span{color:var(--pfb-muted);font-size:.82rem;font-weight:850}._5l0SBq_symbolButton{min-width:4.7rem;min-height:4.7rem;color:var(--pfb-ink);cursor:pointer;background:#ffffffe6;border:2px solid #3d7f8f47;border-radius:1rem;place-items:center;padding:.45rem;display:grid;box-shadow:0 7px 18px #1d4c5a17}._5l0SBq_symbolSelected{border-color:var(--pfb-green);background:var(--pfb-green-pale);box-shadow:0 0 0 4px #14775921}._5l0SBq_symbolTry{border-style:dashed;border-color:var(--pfb-amber);background:var(--pfb-amber-pale)}._5l0SBq_fractionSymbol{min-width:2.2rem;font-size:1.85rem;font-weight:950;line-height:1;display:inline-grid}._5l0SBq_fractionSymbol span{padding:.1rem .35rem}._5l0SBq_fractionSymbol span:first-child{border-bottom:2.5px solid}._5l0SBq_ideaCorrect{border-color:var(--pfb-green);background:var(--pfb-green-pale);box-shadow:0 0 0 4px #14775921}._5l0SBq_ideaTry{border-style:dashed;border-color:var(--pfb-amber);background:var(--pfb-amber-pale)}._5l0SBq_feedback{background:#ffffffc7;border:1px solid #397f8f38;border-radius:1rem;justify-content:center;align-items:center;gap:.65rem;min-height:4rem;margin:.7rem clamp(.65rem,2.5vw,1.4rem) clamp(.65rem,2.5vw,1.1rem);padding:.8rem 1rem;display:flex}._5l0SBq_feedback>span{border:1px solid;border-radius:50%;flex:none;place-items:center;width:1.8rem;height:1.8rem;font-weight:900;display:grid}._5l0SBq_feedback p{margin:0;font-weight:850;line-height:1.35}._5l0SBq_feedbackNotice{color:var(--pfb-blue-dark);background:var(--pfb-blue-pale)}._5l0SBq_feedbackSuccess{color:var(--pfb-green);background:var(--pfb-green-pale);border-color:#14775947}._5l0SBq_feedbackTry{border-style:dashed;border-color:var(--caution-border);color:var(--caution-text);background:var(--caution-bg)}._5l0SBq_srOnly{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}._5l0SBq_builder :where(button):focus-visible{outline-offset:3px;outline:4px solid #7c3aed}._5l0SBq_historyControls button:hover:not(:disabled),._5l0SBq_primaryControl:hover,._5l0SBq_secondaryControl:hover,._5l0SBq_symbolButton:hover,._5l0SBq_ideaButton:hover{transform:translateY(-1px)}@keyframes _5l0SBq_objectArrive{0%{opacity:0;transform:translateY(10px)scale(.96)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes _5l0SBq_splitReveal{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}@keyframes _5l0SBq_railArrive{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes _5l0SBq_lineBreathe{0%,to{opacity:.45}50%{opacity:.95}}@media (max-width:700px){._5l0SBq_progressWrap{width:calc(100% - 1.2rem)}._5l0SBq_progress li small{display:none}._5l0SBq_progress ._5l0SBq_current small{white-space:nowrap;display:block;position:absolute;top:2.2rem}._5l0SBq_progress{margin-bottom:1.25rem}._5l0SBq_comparisonRail{grid-template-columns:repeat(3,minmax(0,1fr));gap:.55rem;width:100%;min-height:11.5rem}._5l0SBq_comparisonRail>i{display:none}._5l0SBq_barExtension{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:.55rem;width:100%}._5l0SBq_barExtension>i{transform:none}._5l0SBq_barModel{width:min(100%,16rem)}._5l0SBq_stageVisual{min-height:17.75rem}._5l0SBq_stageVisualStacked ._5l0SBq_viewport{width:min(100%,18rem)}}@media (max-width:480px){._5l0SBq_labHeader{grid-template-columns:1fr;align-items:flex-start;gap:.7rem;padding-inline:.85rem}._5l0SBq_labHeader h2{max-width:none;font-size:clamp(1.45rem,9vw,1.8rem);line-height:1.08}._5l0SBq_historyControls{grid-template-columns:repeat(2,minmax(0,1fr));justify-content:stretch;width:min(100%,20rem);display:grid}._5l0SBq_historyControls button{min-width:0;min-height:2.9rem}._5l0SBq_labCanvas{margin-inline:.38rem;padding:.75rem .55rem}._5l0SBq_controlDock,._5l0SBq_explanationControls{grid-template-columns:1fr;width:min(100%,20rem);display:grid}._5l0SBq_symbolControls{grid-template-columns:repeat(2,minmax(0,1fr));width:min(100%,20rem);display:grid}._5l0SBq_symbolControls>span,._5l0SBq_symbolControls>._5l0SBq_primaryControl{grid-column:1/-1}._5l0SBq_primaryControl,._5l0SBq_secondaryControl,._5l0SBq_ideaButton{width:100%}._5l0SBq_symbolControls>span{text-align:center}._5l0SBq_symbolButton{width:100%}}@media (prefers-reduced-motion:reduce){._5l0SBq_builder *,._5l0SBq_builder :before,._5l0SBq_builder :after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}:root[data-theme=dark] ._5l0SBq_builder{--pfb-ink:#e5f6f9;--pfb-muted:#b6ccd3;--pfb-blue:#3bc0dc;--pfb-blue-dark:#83def0;--pfb-blue-pale:#173e4a;--pfb-paper:#18323c;--pfb-cream:#10242d;--pfb-green:#8ee2c0;--pfb-green-pale:#173c32;--pfb-amber:#f0bd90;--pfb-amber-pale:#3f2d21;background:radial-gradient(circle at 95% -12%, #844e2f4d, transparent 29rem), radial-gradient(circle at -8% 4%, #166a7e57, transparent 31rem), var(--pfb-cream);border-color:#5499aa7a;box-shadow:0 30px 90px #00000057,inset 0 1px #ffffff0f}:root[data-theme=dark] ._5l0SBq_labCanvas{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_viewport{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_comparisonRail{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_barExtension{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_historyControls button{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_secondaryControl{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_ideaButton{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_symbolButton{background:#142d37f5;border-color:#63a7b84f;box-shadow:0 14px 34px #00000030,inset 0 1px #ffffff0d}:root[data-theme=dark] ._5l0SBq_labCanvas{background:repeating-linear-gradient(0deg,#0000 0 31px,#7dd3fc12 31px 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