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rgba(203,213,225,.95);border-bottom:0;border-radius:9px 9px 0 0;box-shadow:0 -7px 18px #1f293314;font-size:.84rem;font-weight:900;line-height:1}.rule-block{display:grid;grid-template-columns:20px minmax(0,1fr);align-items:center;gap:8px}.rule-number{display:grid;place-items:center;align-self:start;width:18px;height:18px;margin-top:4px;color:#475569;background:#f1f5f9;border:1px solid #d5dce6;border-radius:999px;font-size:.72rem;font-weight:800;line-height:1}.rule-panel-section{display:grid;justify-items:center;gap:1px}.rule-diagram-row{--rule-left-column: 120px;--rule-action-column: 56px;--rule-right-column: 120px;display:grid;grid-template-columns:var(--rule-left-column) var(--rule-action-column) var(--rule-right-column);align-items:center;justify-items:center;width:calc(var(--rule-left-column) + var(--rule-action-column) + var(--rule-right-column))}.rule-diagram-row-transform{--rule-left-column: 42px;--rule-action-column: 38px;--rule-right-column: 42px}.rule-diagram-row-merge{align-items:center}.rule-action{position:relative;display:grid;place-items:center;width:var(--rule-action-column);height:30px;color:#64748b}.rule-action-label{position:absolute;left:50%;top:-4px;min-height:12px;transform:translate(-50%,-100%);font-size:.64rem;font-weight:800;line-height:1;letter-spacing:0}.rule-diagram-row-transform 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#cbd5e1;border-radius:8px;cursor:pointer}.text-button:hover:not(:disabled){background:#edf2f7}.text-button:disabled{color:#98a2b3;cursor:not-allowed}.board{position:relative;flex:1;min-height:620px;overflow:hidden;background:linear-gradient(rgba(36,48,67,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(36,48,67,.045) 1px,transparent 1px),#fbfaf7;background-size:32px 32px}.board.is-stage-board{height:100%;min-height:0;overflow:hidden}.stage-goal-banner{position:sticky;left:0;top:0;z-index:8;display:grid;gap:3px;width:max-content;max-width:min(760px,calc(100% - 32px));margin:18px auto 0;padding:4px 18px 10px;pointer-events:none;text-align:center}.stage-goal-stage{color:#64748b;font-size:.82rem;font-weight:900;letter-spacing:0}.stage-goal-text{color:#1f2933;font-size:clamp(1.8rem,4vw,3.1rem);font-weight:950;letter-spacing:0;line-height:1.04;text-shadow:0 2px 0 rgba(255,255,255,.9)}.stage-completion-overlay{position:absolute;inset:0;z-index:40;display:grid;place-items:center;width:100%;min-height:100%;padding:28px;background:#fbfaf79e;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.stage-completion-card{position:relative;z-index:2;display:grid;justify-items:center;gap:12px;min-width:min(360px,calc(100vw - 48px));padding:26px 28px 24px;background:#fffffff5;border:1px solid #cbd5e1;border-radius:10px;box-shadow:0 22px 54px #1f29332e;animation:completion-card-enter .42s cubic-bezier(.16,1,.3,1) both}.stage-completion-title{color:#1f2933;font-size:2.2rem;font-weight:950;line-height:1}.stage-completion-term{display:grid;place-items:center;min-height:76px}.stage-completion-subtitle{color:#64748b;font-size:.95rem;font-weight:800}.stage-next-button{min-height:40px;padding:0 18px;color:#fff;background:#243043;border:1px solid #1f2933;border-radius:8px;box-shadow:0 7px 16px #1f29332e;cursor:pointer;font-weight:900}.stage-next-button:hover{background:#111827}.stage-completion-burst{position:absolute;left:50%;top:50%;z-index:1;width:1px;height:1px;pointer-events:none}.stage-completion-particle{position:absolute;left:0;top:0;width:9px;height:9px;background:#f97316;border-radius:2px;opacity:0;transform:rotate(var(--particle-angle)) translate(0) rotate(calc(var(--particle-angle) * -1));animation:completion-particle .98s ease-out var(--particle-delay) 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infinite}.factor-button.is-active-factor.is-math-factor:before{opacity:0;background:none;box-shadow:none;filter:none;animation:none}.factor-button.is-active-factor{z-index:3}.factor-button.is-dimmed-factor{background:transparent}.factor-button:hover:not(.is-disabled){background:transparent}.factor-button.is-dimmed-factor:hover:not(.is-disabled){background:transparent}.factor-button:focus-visible{outline:2px solid #2f80ed;outline-offset:2px}.factor-button.is-disabled{cursor:grab}.factor-button.is-math-factor{width:auto;height:auto;min-width:0;min-height:0;padding:1px 3px;border-radius:4px;color:#1f2937;transition:transform .12s ease,background .12s ease}.factor-button.is-math-factor:hover:not(.is-disabled){background:#0f172a0d}.factor-button.is-reordering-factor{z-index:4;cursor:grabbing;transition:none}.factor-button.is-math-factor.is-reordering-factor{z-index:8;transition:transform 55ms linear,background .12s ease}.factor-button.is-transition-locked-factor,.factor-button.is-transition-locked-factor .factor-shape{transition:none}.factor-button.is-auto-sorting-factor{animation:factor-auto-sort .19s ease-out both}.factor-button.is-math-factor.is-auto-sorting-factor{animation:math-factor-auto-sort .18s cubic-bezier(.16,1,.3,1) both}.factor-shape{position:relative;z-index:1;width:var(--factor-shape-size, 40px);height:var(--factor-shape-size, 40px);filter:drop-shadow(0 2px 2px rgba(31,41,51,.16));transform:scale(var(--factor-scale, 1));transform-origin:50% 50%;transition:transform .16s ease;will-change:transform}.factor-button.is-active-factor:not(.is-math-factor) .factor-shape{filter:drop-shadow(0 2px 2px rgba(31,41,51,.14)) drop-shadow(0 0 4px rgba(255,236,140,.5)) drop-shadow(0 0 9px rgba(255,185,50,.32))}.math-factor-content{position:relative;z-index:1;display:inline-flex;align-items:baseline;justify-content:center;gap:4px;min-width:max-content;color:#1f2937;white-space:nowrap;transform:none;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.math-factor-content.is-previewing-unselect{display:inline-grid;align-items:baseline;justify-items:center;position:relative}.math-factor-measure-state,.math-factor-core-state{grid-area:1 / 1;display:inline-flex;align-items:baseline;justify-content:center}.math-factor-measure-state{visibility:hidden}.math-factor-core-state{z-index:1}.math-selection-shell{position:absolute;inset:0 -1px;z-index:2;display:flex;align-items:baseline;justify-content:space-between;color:#475569;pointer-events:none}.math-selection-left,.math-selection-right{animation:math-selection-detach .36s ease-out 90ms forwards}.math-selection-left{transform-origin:right center;--math-selection-x: -5px}.math-selection-right{transform-origin:left center;--math-selection-x: 5px}.factor-button.is-dimmed-factor .math-factor-content{opacity:1;transform:none}.factor-button.is-dimmed-factor .factor-shape{transform:scale(var(--factor-scale, 1))}.factor-button.is-reordering-factor .factor-shape{animation:factor-wiggle .22s ease-in-out infinite}.factor-button.is-reordering-factor .math-factor-content{animation:none}.factor-button.is-math-factor.is-reordering-factor .math-factor-content{transform:translateY(-4px);border-radius:6px;background:#fffffff0;box-shadow:0 5px 12px #1f293324,0 0 0 1px #9ab7df61}.factor-button.is-merge-pulled-factor{z-index:5;animation:factor-merge-pull .42s cubic-bezier(.45,0,.2,1) forwards}.factor-button.is-merge-anchor-factor{z-index:9;animation:factor-merge-anchor .72s cubic-bezier(.45,0,.2,1) forwards}.factor-button.is-split-spit-factor{z-index:5;animation:factor-split-spit .38s cubic-bezier(.16,1,.3,1) both}.factor-button.is-split-anchor-factor{z-index:9;animation:factor-split-anchor .38s ease-out both}@keyframes merge-pop{0%{transform:scale(.92)}52%{transform:scale(1.08)}to{transform:scale(1)}}@keyframes snap-slot-open{0%{height:18px;opacity:0}to{height:calc(var(--term-cell-size, 44px) + 18px);opacity:1}}@keyframes factor-merge-pull{0%{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}68%{opacity:.95;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--merge-x, 0px)),var(--merge-y, 0px)) scale(.56)}to{opacity:0;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--merge-x, 0px)),var(--merge-y, 0px)) scale(.18)}}@keyframes factor-merge-anchor{0%{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}45%{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}62%{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}to{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--settle-x, 0px)),var(--settle-y, 0px)) scale(1)}}@keyframes factor-split-spit{0%{opacity:0;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--split-x, 0px)),var(--split-y, 0px)) scale(.22)}62%{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1.08)}to{opacity:1;transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}}@keyframes factor-split-anchor{0%{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(.82)}48%{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1.2)}to{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px))) scale(1)}}@keyframes group-card-merge-shrink{0%{left:-8px;top:-8px;width:calc(100% + 16px);height:calc(100% + 16px)}45%,62%{left:-8px;top:-8px;width:calc(100% + 16px);height:calc(100% + 16px)}to{left:var(--merge-card-left, 0px);top:var(--merge-card-top, 0px);width:var(--merge-card-width, 0px);height:var(--merge-card-height, 0px)}}@keyframes group-card-split-grow{0%{width:calc(var(--group-collapsed-width, 0px) + 16px);height:calc(var(--group-collapsed-height, 0px) + 16px)}to{width:calc(var(--group-full-width, 0px) + 16px);height:calc(var(--group-full-height, 0px) + 16px)}}@keyframes term-preview-move{0%{transform:translate(var(--term-dx, 0px),var(--term-dy, 0px))}to{transform:translate(0)}}@keyframes math-card-gather{0%{opacity:1;transform:scaleY(1)}to{opacity:.88;transform:scaleY(var(--math-merge-card-scale-y, .5))}}@keyframes math-card-release{0%{opacity:.88;transform:scaleY(var(--math-merge-card-scale-y, .5))}to{opacity:1;transform:scaleY(1)}}@keyframes math-term-gather{0%{opacity:1;transform:translateY(0) scale(1)}to{opacity:var(--math-term-gather-opacity, 0);transform:translateY(var(--math-merge-y, 0px)) scale(.985)}}@keyframes math-term-release{0%{opacity:var(--math-term-release-opacity, 0);transform:translateY(var(--math-term-release-y, 0px)) scale(.985)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes math-inline-fade{to{opacity:0}}@keyframes math-selection-detach{to{opacity:0;transform:translate(var(--math-selection-x, 0px),-3px) scale(.96)}}@keyframes connection-flow-down{0%{background-position-x:0}to{background-position-x:11px}}@keyframes connection-flow-up{0%{background-position-x:0}to{background-position-x:-11px}}@keyframes connection-line-move{0%{left:var(--from-left);top:var(--from-top);width:var(--from-length);transform:translateY(-50%) rotate(var(--from-angle))}to{left:var(--to-left);top:var(--to-top);width:var(--to-length);transform:translateY(-50%) rotate(var(--to-angle))}}@keyframes connection-line-eat-vertical{0%{top:var(--vertical-top);height:var(--vertical-height);opacity:.52}to{top:var(--vertical-collapsed-top);height:0;opacity:0}}@keyframes connection-line-spit-vertical{0%{top:var(--vertical-collapsed-top);height:0;opacity:0}to{top:var(--vertical-top);height:var(--vertical-height);opacity:.5}}@keyframes factor-wiggle{0%{transform:translate(-.35px,-3px) rotate(-1deg) scale(var(--factor-wiggle-scale, 1.035))}25%{transform:translate(.55px,-3.35px) rotate(.7deg) scale(var(--factor-wiggle-scale, 1.035))}50%{transform:translate(-.55px,-2.75px) rotate(1deg) scale(var(--factor-wiggle-scale, 1.035))}75%{transform:translate(.35px,-3.25px) rotate(-.7deg) scale(var(--factor-wiggle-scale, 1.035))}to{transform:translate(-.35px,-3px) rotate(-1deg) scale(var(--factor-wiggle-scale, 1.035))}}@keyframes selected-halo-pulse{0%,to{opacity:.72;transform:scale(.96)}50%{opacity:.96;transform:scale(1.08)}}@keyframes factor-auto-sort{0%{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--sort-dx, 0px)))}to{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px)))}}@keyframes math-factor-auto-sort{0%{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px) + var(--sort-dx, 0px)))}to{transform:translate(calc(var(--drag-x, 0px) + var(--slot-x, 0px)))}}@keyframes completion-card-enter{0%{opacity:0;transform:translateY(14px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes completion-particle{0%{opacity:0;transform:rotate(var(--particle-angle)) translate(0) rotate(calc(var(--particle-angle) * -1)) scale(.4)}18%{opacity:1}to{opacity:0;transform:rotate(var(--particle-angle)) translate(var(--particle-distance)) rotate(calc(var(--particle-angle) * -1)) scale(1)}}@keyframes rule-flow-down{0%{background-position-y:0}to{background-position-y:8px}}@keyframes rule-flow-up{0%{background-position-y:0}to{background-position-y:-8px}}@media(max-width:640px){.game-layout{grid-template-columns:1fr}.stage-panel,.palette-panel{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;max-height:220px;border-right:0;border-bottom:1px solid #d7dde5}.stage-panel.is-collapsed{width:100%;max-height:58px}.stage-panel-header,.palette-title{grid-column:1 / -1;margin-bottom:0}.stage-list{grid-column:1 / -1;grid-template-columns:1fr 1fr;max-height:138px}.top-bar{align-items:flex-start;flex-direction:column;padding:14px 16px}.top-actions{justify-content:flex-start}.board{min-height:680px}.stage-goal-text{font-size:1.75rem}.rule-panel{top:auto;right:10px;bottom:10px;width:min(350px,calc(100vw - 20px))}}