:root{font-family:Avenir Next,Avenir,Segoe UI,sans-serif;color:#213a38;background:#eef3f2;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;border:1px solid #bccdca;background:#f8fbfa;padding:11px 17px;border-radius:9px;cursor:pointer;transition:background .15s,transform .15s}button:hover:not(:disabled){background:#ddeae7}button:active:not(:disabled){transform:scale(.98)}button:disabled{opacity:.42;cursor:default}button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #138478;outline-offset:4px}header{display:flex;justify-content:space-between;align-items:center;padding:28px 40px;gap:24px;border-bottom:1px solid #d5e0dd}.brand{font-size:25px;letter-spacing:-1px;font-weight:650;color:inherit;text-decoration:none;white-space:nowrap}.brand span{display:block;font-size:12px;font-weight:450;letter-spacing:.2px;margin-top:6px;color:#52716b}.header-actions{display:flex;gap:9px}#enter-xr,#next{background:#216c60;color:#fff;border-color:#216c60}#enter-xr:hover:not(:disabled),#next:hover:not(:disabled){background:#19594e}main{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:20px;padding-right:40px;max-width:1600px;margin:auto;min-height:680px}.play-area{position:relative;min-width:0;min-height:620px;overflow:hidden}#scene-container{width:100%;height:100%;position:absolute;inset:0}#scene-container canvas{display:block;width:100%;height:100%;touch-action:manipulation}.scene-caption{position:absolute;left:40px;bottom:18px;font-size:13px;color:#5d7771;pointer-events:none}#loading{position:absolute;inset:45% 0 auto;text-align:center;font-size:16px}#simulation-label{position:absolute;top:14px;left:25px;font-size:10px;letter-spacing:1.2px;padding:8px 10px;background:#fff;border-radius:6px;pointer-events:none}aside{padding:46px 0 32px}.eyebrow{font-size:10px;letter-spacing:2px;color:#5c7b72;margin:0 0 16px}h1{font-size:36px;line-height:1.05;font-weight:550;letter-spacing:-1.4px;margin:0 0 15px}#level-note{line-height:1.65;color:#5b7770;font-size:14px;min-height:69px}.stats{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #c8d9d3;border-bottom:1px solid #c8d9d3;padding:18px 0;margin-top:25px;gap:14px}.stats strong{font-size:25px;font-weight:500;display:block}.stats span{font-size:11px;color:#55756c;display:block;margin-top:5px}#status{min-height:43px;font-size:13px;line-height:1.6}.action-row{display:flex;gap:8px}.action-row button{flex:1;font-size:12px}#next{width:100%;margin-top:9px;font-size:13px}.instructions{font-size:12px;color:#557269;line-height:1.7;margin-top:29px}.instructions b{color:#294b40;font-weight:600}.local-note{font-size:10px;color:#667c76;line-height:1.6}details{font-size:12px;margin:20px 0}summary{cursor:pointer}#accessible-board{display:grid;gap:4px;margin-top:12px}#accessible-board button{padding:7px;font-size:11px;min-width:0}#accessible-board button.wet{background:#216c60;color:#fff}footer{border-top:1px solid #d5e0dd;padding:18px 40px;display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#5f7771}footer button{border:0;background:none;padding:4px;font-size:11px;text-decoration:underline}dialog{border:1px solid #cadad4;border-radius:14px;max-width:510px;padding:28px;color:#213a38;background:#f8fbfa}dialog::backdrop{background:#213a3866}dialog p{font-size:14px;line-height:1.7}h2{font-size:24px;font-weight:550;letter-spacing:-.6px}dialog button{width:100%;margin-top:8px}@media(max-width:850px){header{padding:20px;flex-wrap:wrap}.header-actions{width:100%;gap:5px}.header-actions button{font-size:11px;padding:10px;flex:1}main{grid-template-columns:1fr;padding:0;gap:0;min-height:0}.play-area{min-height:440px}.scene-caption{left:20px;bottom:0;font-size:10px}aside{padding:18px 24px 30px}h1{font-size:30px}#level-note{min-height:0}.instructions{max-width:450px}footer{padding:15px 24px}.stats{margin-top:15px}#simulation-label{left:15px;font-size:8px}}@media(prefers-reduced-motion:reduce){button{transition:none}}footer a{color:inherit;text-decoration:underline}.footer-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}footer{flex-wrap:wrap;gap:12px}