:root{--ink:#173d3a;--muted:#59716c;--paper:#faf7f2;--line:#d7dfd5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,sans-serif}header,footer,main{max-width:1180px;margin:auto;padding:28px}header{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);font-size:12px;font-weight:750;letter-spacing:.08em}footer{border-top:1px solid var(--line);font-size:12px;color:var(--muted);margin-top:50px}a{color:inherit;text-underline-offset:4px}h1{font-size:clamp(36px,6vw,68px);line-height:1.05;letter-spacing:-.05em;font-weight:750;max-width:850px;margin:25px 0}h2{font-size:27px;line-height:1.2;letter-spacing:-.02em}h3{font-size:19px;line-height:1.5}h4{font-size:16px}.eyebrow{font-size:11px;letter-spacing:.12em;font-weight:700;color:var(--muted);margin-top:35px}.lede{font-size:20px;max-width:780px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:38px 0}.card{display:block;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fffdf8;text-decoration:none;min-width:0}.card:nth-child(2){background:#f5e8ce}.card:nth-child(3){background:#e6edef}.card h2{font-size:24px}.card picture{display:block}.card img{width:100%;height:auto;object-fit:contain}.card p{font-size:14px}.button,button{display:inline-block;background:var(--ink);border:1px solid var(--ink);color:white;border-radius:8px;padding:12px 19px;font:inherit;text-decoration:none;cursor:pointer;min-height:44px}.secondary{background:transparent;color:var(--ink)}.actions{display:flex;gap:12px;flex-wrap:wrap}.intro{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:35px;margin:20px 0 45px}.intro img{width:100%;height:auto}.intro picture{background:#e5ebdf;border-radius:22px}.parts{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.parts li{background:#fffdf8;border:1px solid var(--line);border-radius:12px;min-width:0}.parts label{display:flex;align-items:center;gap:8px;padding:12px;font-size:13px}.parts img{width:72px;height:72px;object-fit:contain}input[type=checkbox]{width:20px;height:20px;flex-shrink:0;accent-color:var(--ink)}details{padding:18px 0;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:650;min-height:30px}.instruction{padding:35px 0;border-top:1px solid var(--line);scroll-margin-top:10px}.step-title{display:flex;gap:22px;align-items:baseline}.step-title>span{font-size:36px;font-weight:750;color:#6c826f}.step-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:30px}.step-layout picture{display:block;background:#e6ebdf;border-radius:16px;overflow:hidden}.step-layout img{width:100%;height:auto;display:block}.step-layout ul{padding-left:20px}.step-layout aside>p{color:var(--muted);font-size:13px}.step-nav{display:flex;justify-content:space-between;gap:15px;margin-top:20px}.step-nav a{padding:10px}.fine{font-size:11px;overflow-wrap:anywhere}.callout{padding:25px 32px;background:#e7ecdf;border-radius:18px;margin:40px 0}.model-view{height:300px;position:relative}.model-view canvas{max-width:100%}.model-view[hidden],.instruction[hidden]{display:none}.graphics-status{font-size:12px}.storage-status{font-size:13px}@media(max-width:760px){header,footer,main{padding:20px}.cards,.parts{grid-template-columns:1fr 1fr}.intro,.step-layout{grid-template-columns:1fr}.intro{gap:10px}.intro picture{max-width:480px}.step-title{gap:14px}.step-title h3{font-size:17px}.step-nav{font-size:14px}}@media(max-width:480px){.cards,.parts{grid-template-columns:1fr}.card picture{max-width:340px;margin:auto}.parts img{width:75px}.step-nav span{align-self:center;font-size:12px}header{font-size:10px}h1{font-size:38px}}@media print{header,footer,.step-nav,button,.actions,nav{display:none}.instruction[hidden]{display:block}.instruction{break-before:page}.step-layout{grid-template-columns:1.5fr 1fr}.parts{grid-template-columns:1fr 1fr}.step-layout picture{background:white}body{background:white}main{padding:0}}
.activity-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.menu figure{margin:0}.menu figcaption{font-weight:700;text-align:center}.route{display:block;max-width:650px;width:100%;height:auto;margin:30px 0}.route text{font:700 18px system-ui,sans-serif}@media(max-width:480px){.activity-cards{grid-template-columns:1fr}}
.cards>figure{margin:0}
@font-face{font-family:Nunito;src:url(nunito-latin.woff2) format('woff2');font-weight:400 900;font-display:swap}h1,h2,h3,h4{font-family:Nunito,system-ui,sans-serif}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #a94422;outline-offset:4px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:absolute;top:-100px;left:12px;background:white;padding:10px;z-index:100}.skip-link:focus{top:8px}.guide-jumps{display:flex;gap:12px;flex-wrap:wrap;margin:25px 0}.guide-jumps a{padding:10px 0}.before-build{margin:24px 0}.before-build p{max-width:780px}.credits{margin-top:40px}.step-title h3{scroll-margin-top:24px}#play{scroll-margin-top:24px;margin:45px 0}.step-nav a{min-height:44px}html:not(.js) [data-3d],html:not(.js) [data-restart]{display:none}.pack-content{overflow-wrap:break-word}

.viewer-actions{display:flex;flex-wrap:wrap;gap:.35rem}.viewer-actions button,.step-nav a{min-height:44px}.step-nav a{display:inline-flex;align-items:center}

.guide-sections{display:flex;gap:20px;flex-wrap:wrap;margin:25px 0}.guide-sections a{padding:10px 0;min-height:44px}.intro>*{min-width:0}.printable-preview{max-width:360px;margin:30px 0}.printable-preview img{max-width:100%;height:auto}.step-nav{flex-wrap:wrap;align-items:center}.viewer-actions{margin:12px 0}