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/* 2026-10-05: visual motion, without animating reading text. */
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@media(max-width:760px){.scene-replay{left:2px;bottom:-8px;font-size:9px}.art-index{bottom:36px;left:5px;font-size:6px}.math-burst{font-size:18px}}
@media(max-width:380px){.books-art .book-one{animation-name:small-book-one}.books-art .book-three{animation-name:small-book-three}}@keyframes small-book-one{0%,100%{transform:rotate(-8deg) translateY(8px)}50%{transform:rotate(-9deg) translateY(-3px)}}@keyframes small-book-three{0%,100%{transform:rotate(8deg) translateY(10px)}50%{transform:rotate(9deg) translateY(0)}}
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.paused .math-scene,.paused .scene-depth,.paused .scene-slot{transition:none}.scene-replay:disabled{cursor:default}

/* A hands-on mathematical universe: canvas atmosphere + real keyboard controls. */
.universe{background:#10213c;color:#f5f2e9;padding:75px max(28px,calc((100% - 1152px)/2)) 50px;position:relative;isolation:isolate;overflow:hidden}.universe:before{content:'';position:absolute;inset:0;z-index:-1;background:radial-gradient(ellipse at 80% 50%,#325ced20,transparent 65%)}.universe-head{display:flex;align-items:flex-end;justify-content:space-between;gap:35px;margin-bottom:35px}.universe-head .eyebrow{color:#bbcdf0;font-size:9px}.universe-head h2{font-size:clamp(45px,5.2vw,74px);letter-spacing:-2.5px;line-height:1.03;margin:0}.universe-head h2 em{color:#d8e79d}.universe-head>p{color:#b9c9e2;font-size:14px;line-height:1.8;padding-bottom:5px}.universe-panel{border:1px solid #adc4ed35;border-radius:8px;background:#0c1c35;overflow:hidden}.universe-modes{display:flex;padding:16px 25px;gap:10px;border-bottom:1px solid #adc4ed25;position:relative;z-index:3}.universe-modes button{background:none;color:#b9c9e2;border:1px solid transparent;border-radius:30px;padding:12px 18px;min-height:44px;font-size:11px;letter-spacing:.3px}.universe-modes button[aria-pressed=true]{color:#10213c;background:#d8e79d}.universe-modes button:hover{border-color:#b9c9e2}.universe-stage{height:540px;position:relative;background:radial-gradient(ellipse at center,#26487c45,transparent 65%);overflow:hidden}.universe-stage canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.universe-center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;pointer-events:none}.universe-center span{font:italic 72px Georgia,serif;letter-spacing:-7px;color:#b9c9e21c}.universe-center small{display:block;color:#bbcdf070;font-size:8px;letter-spacing:2px;text-transform:uppercase;margin-top:15px}.universe-node{position:absolute;left:50%;top:50%;width:68px;height:68px;margin:-34px;border:1px solid #d0def880;border-radius:50%;display:grid;place-items:center;box-shadow:0 8px 30px #0003;color:#10213c;touch-action:none;cursor:grab;will-change:transform;transform:rotate(var(--initial-angle)) translateX(130px) rotate(calc(-1 * var(--initial-angle)));z-index:2;font:38px Georgia,serif;user-select:none}.universe-node span{pointer-events:none}.node-blue{background:#537bfa;color:white;border-radius:19px}.node-orange{background:#fa784b}.node-lime{background:#d8e79d;border-radius:18px}.node-paper{background:#f5f2e9}.universe-node:active,.universe-node.dragging{cursor:grabbing;box-shadow:0 0 0 10px #d8e79d15,0 0 40px #537bfa50;z-index:4}.universe-node:focus-visible{outline:3px solid #d8e79d;outline-offset:6px;z-index:4}.universe-axis{position:absolute;top:50%;font-size:8px;letter-spacing:2px;color:#b9c9e278;writing-mode:vertical-rl;pointer-events:none}.axis-left{left:20px;transform:translateY(-50%) rotate(180deg)}.axis-right{right:20px;transform:translateY(-50%)}.universe-controls{border-top:1px solid #adc4ed25;padding:18px 25px;display:flex;align-items:center;justify-content:space-between;gap:24px;position:relative;z-index:3;background:#10213c}.universe-controls button{border:1px solid #b9c9e255;background:none;color:#f5f2e9;padding:12px 18px;border-radius:30px;font-size:11px;min-height:44px}.universe-controls button:hover{background:#253d60}.universe-controls button:first-child{background:#f5f2e9;color:#10213c;border-color:#f5f2e9}.universe-controls button:first-child span{margin-left:22px}.universe-controls label{display:flex;align-items:center;gap:16px;font-size:10px;min-width:0}.universe-controls input{width:130px;min-height:44px;accent-color:#d8e79d;padding:0;border:0;background:none}.universe-controls output{font-variant-numeric:tabular-nums;width:32px}.universe-foot{display:flex;justify-content:space-between;gap:45px;align-items:center;margin-top:24px}.universe-foot p{font-size:11px;color:#b9c9e2;line-height:1.6;max-width:540px;margin:0}.universe-foot #universeStatus{color:#d8e79d;margin-top:10px}.universe-next{white-space:nowrap;color:#f5f2e9;border-bottom:1px solid #b9c9e26b;padding:12px 0;font-size:12px}.universe-next span{margin-left:18px}.universe-fallback{font-size:12px}.universe-fallback a{text-decoration:underline}.universe :focus-visible{outline-color:#d8e79d}.universe-controls button:disabled{opacity:.5;cursor:default}
@media(max-width:760px){.universe{padding:55px 20px 35px}.universe-head{display:block;margin-bottom:25px}.universe-head h2{font-size:49px}.universe-head>p{font-size:12px;margin:22px 0 0}.universe-stage{height:410px}.universe-modes{padding:12px 8px;gap:2px;justify-content:space-between}.universe-modes button{font-size:9px;padding:10px 12px}.universe-node{width:50px;height:50px;margin:-25px;font-size:28px}.universe-center span{font-size:54px}.universe-center small{font-size:6px;letter-spacing:1px}.universe-axis{font-size:6px}.axis-left{left:8px}.axis-right{right:8px}.universe-controls{padding:14px 12px;gap:12px;flex-wrap:wrap}.universe-controls label{order:3;justify-content:space-between;width:100%;gap:10px}.universe-controls input{flex:1;width:100px}.universe-controls button{font-size:9px;padding:10px 12px}.universe-controls button:first-child span{margin-left:9px}.universe-foot{display:block;margin-top:20px}.universe-foot p{font-size:10px}.universe-next{display:inline-block;margin-top:16px;font-size:11px}}