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.simplify-board{margin:1.4rem 0;padding:1.25rem;border-radius:20px;background:linear-gradient(135deg,#f4f8ff,#eefbf7);text-align:center}.simplify-board__label{margin:0 0 .45rem;font-size:.68rem;font-weight:800;letter-spacing:.12em;color:#637891}.simplify-question{font:700 clamp(1.7rem,5vw,2.8rem) Georgia;color:#172438}.term-map{display:flex;justify-content:center;gap:.65rem;flex-wrap:wrap;margin-top:1rem}.term-map span{padding:.45rem .65rem;border-radius:10px;font-weight:700}.term-map__x{background:#fff0bd;color:#60480b}.term-map__number{background:#c9f0e4;color:#075039}.simplify-options{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem}.simplify-option{min-height:84px;border:2px solid #dce4ef;border-radius:16px;background:#fff;color:#253950;font:700 1.3rem Georgia;cursor:pointer;transition:.16s}.simplify-option:hover:not(:disabled){border-color:#0b8e67;transform:translateY(-2px)}.simplify-option.is-correct{background:#e5f8f1;border-color:#0b8e67;color:#075039}.simplify-option.is-wrong{background:#fff0ee;border-color:#e36750;color:#8f2817}@media(max-width:650px){.simplify-options{grid-template-columns:1fr}.simplify-option{min-height:66px}}
/* Balance Lab: show equal groups and matching operations without tall tile stacks. */
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/* A physical balance: a one-sided move tilts the beam toward the heavier pan. */
.physical-balance{transition:background .25s}.physical-balance .balance-line,.physical-balance .balance-pivot,.physical-balance .balance-equals{transition:transform .42s cubic-bezier(.2,.8,.2,1)}.physical-balance.is-right-heavy .balance-line{transform:rotate(7deg);transform-origin:center}.physical-balance.is-right-heavy .balance-pivot{transform:translateY(3px)}.physical-balance.is-right-heavy .balance-equals{transform:rotate(7deg) translateY(-2px)}.physical-balance.is-right-heavy #left-pan{transform:translateY(-8px)}.physical-balance.is-right-heavy #right-pan{transform:translateY(8px)}.physical-balance .balance-side{transition:transform .42s cubic-bezier(.2,.8,.2,1)}.movable-block,.target-block,.equal-group{cursor:pointer;border:0;font:inherit}.movable-block{outline:3px solid #f7c84b;outline-offset:3px;animation:balance-pulse 1.4s infinite}.target-block{outline:0}.equal-group{font:inherit}.physical-balance.is-right-heavy{background:linear-gradient(110deg,#fff8dc,#eff9f5)}@keyframes balance-pulse{50%{transform:translateY(-4px);box-shadow:0 8px 16px #d99b2440}}
/* Review-driven interaction and accessibility refinements. */
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/* Guided Balance Workbench */
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