.decimal-hero{padding:55px 0 30px}.decimal-hero h1{font-size:55px}.golden{padding:18px;background:#f0eaf7;border-radius:12px;font-size:14px;line-height:1.6}.activity-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:25px 0}.activity-nav button,.modes button,.controls button,.choice,.coin{border:1px solid #cdd7c3;background:#fff;border-radius:9px;padding:13px;color:#243d2b;font:inherit;cursor:pointer}.activity-nav button{text-align:left;font-size:14px}.activity-nav button[aria-pressed=true],.modes button[aria-pressed=true]{background:#243d2b;color:white}.workbench{padding:30px;background:#fff;border:1px solid #d9dfcf;border-radius:20px}.workbench>p{line-height:1.7;color:#5f6d60}.modes,.controls{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0;align-items:center}.controls input[type=number],.controls select{padding:10px;border:1px solid #b9c8b0;border-radius:6px;font:inherit;width:110px}.controls label{font-size:14px}.panel{background:#f6f8f0;border-radius:12px;padding:20px;margin:15px 0}.model-row{display:flex;gap:24px;align-items:start;flex-wrap:wrap}.model{width:min(100%,280px);text-align:center;flex-shrink:0}.decimal-grid{display:grid;grid-template-columns:repeat(10,1fr);width:100%;aspect-ratio:1;border:2px solid #34513a;background:white;gap:1px;touch-action:none;user-select:none}.decimal-grid button,.decimal-grid span{border:0;border-radius:0;padding:0;background:#f0f2e8;min-width:0;min-height:0}.decimal-grid .filled{background:#85a34e}.decimal-grid button{cursor:crosshair}.decimal-grid button:focus-visible{outline:3px solid #785392;outline-offset:-3px}.readout{font-size:25px;font-weight:700;margin:15px 0;line-height:1.5}.subtext{font-size:13px;line-height:1.7;color:#5e6d5e}.place-mat{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.place{border:2px dashed #b6c6a7;background:white;border-radius:12px;padding:20px 8px;text-align:center}.place strong{font-size:38px;display:block}.place button{margin:5px;padding:9px 14px}.block{display:inline-block;padding:13px;border-radius:7px;background:#dceaaf;border:1px solid #8da55b;cursor:grab}.track{position:relative;height:84px;margin:32px 15px 0;border-top:4px solid #5e7941}.tick{position:absolute;top:-4px;transform:translateX(-50%);font-size:12px;padding-top:18px;white-space:nowrap}.tick:before{content:'';position:absolute;top:0;left:50%;height:12px;border-left:1px solid #5e7941}.pin{position:absolute;top:-30px;transform:translateX(-50%);color:#744799;font-weight:700;font-size:18px}.feedback-dec{padding:18px;background:#edf4df;border-radius:10px;line-height:1.7;margin-top:15px}.choice{display:block;width:100%;text-align:left;margin:8px 0}.choice:disabled{opacity:1;color:#243d2b}.choice.right{background:#deedc5;border:2px solid #698b38}.choice.wrong{background:#ffeadf;border:2px solid #b56b42}.mini-shop{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.item{padding:18px;background:white;border:1px solid #d9dfcf;border-radius:10px;text-align:center}.item span{display:block;font-size:32px}.coin{border-radius:30px;background:#fff2cc}.hint-dec{background:#fff4d4;padding:15px;border-radius:9px;margin-top:12px}.number-label{font-size:13px;display:flex;justify-content:space-between}.round-target{font-size:32px;color:#56752c}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9166af;outline-offset:3px}.workbench h3{line-height:1.5}button:disabled{cursor:default}@media(max-width:650px){.activity-nav{grid-template-columns:1fr 1fr}.workbench{padding:20px 14px}.decimal-hero h1{font-size:43px}.mini-shop{grid-template-columns:1fr}.model{width:min(100%,250px)}.place{padding:12px 3px}.place strong{font-size:30px}.tick{font-size:10px}.controls button{padding:11px}.modes button{padding:12px}}