:root{--bg:#091417;--panel:#122127;--panel2:#182a30;--line:rgba(178,212,205,.15);--cream:#e6e5d7;--muted:#9aada9;--gold:#d9a45e;--mint:#7bc7ad;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--cream);font-family:'DM Sans',system-ui,sans-serif;line-height:1.55}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline:2px solid var(--gold);outline-offset:2px}a{color:inherit} .app-shell{max-width:1680px;padding:0 clamp(14px,3.2vw,58px);margin:auto}.top{display:flex;justify-content:space-between;align-items:center;gap:16px;height:84px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px}.crest{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--gold);font:700 25px Georgia;color:var(--gold);position:relative}.crest span{position:absolute;font-size:8px;right:2px;top:1px}.brand strong{display:block;font-size:17px;letter-spacing:.31em;font-weight:800}.brand small{color:var(--muted);font-size:9px;letter-spacing:.13em;font-weight:700}.righthead{display:flex;align-items:center;gap:20px}.righthead>a{text-decoration:none;font-size:11px;letter-spacing:.13em;color:var(--muted)}.mark{color:var(--mint);font-size:10px;letter-spacing:.13em}.mark i,.dot{display:inline-block;background:var(--mint);width:6px;height:6px;border-radius:50%;margin-right:7px;box-shadow:0 0 9px var(--mint)}.intro{max-width:820px;padding:48px 0 33px}.eyebrow,.overline{font-size:10px;letter-spacing:.21em;font-weight:800;color:var(--gold)}.eyebrow span{padding:0 9px;color:#556767}.intro h1{font:400 clamp(38px,5vw,76px)/1.06 Georgia,serif;letter-spacing:-.045em;margin:18px 0}.intro h1 em{color:var(--gold);font-weight:400}.intro p{max-width:610px;color:var(--muted);font-size:15px;margin:0}.viewer-shell{border:1px solid var(--line);background:#0e1b20;box-shadow:0 28px 80px #0004}.modebar{height:61px;padding:0 10px;display:flex;align-items:center;gap:3px;border-bottom:1px solid var(--line);background:#14262c}.mode{border:0;border-bottom:2px solid transparent;padding:16px 17px;background:transparent;color:#7f9a9b;font-size:10px;letter-spacing:.04em}.mode b{font-size:12px;margin-left:6px;font-weight:700}.mode.active{border-bottom:2px solid var(--gold);color:var(--cream);background:#1c3339}.mode:hover,.smallbtn:hover{background:#263941}.spacer{flex:1}.smallbtn{background:none;color:var(--muted);border:1px solid var(--line);padding:8px 13px}.viewer-body{display:grid;grid-template-columns:minmax(0,1fr) 345px;min-height:645px}.stage{position:relative;min-height:645px;overflow:hidden;background:radial-gradient(ellipse at 51% 49%,#24383b 0%,#132228 43%,#09161a 100%)}canvas{display:block;width:100%;height:100%;touch-action:none;cursor:grab}canvas:active{cursor:grabbing}.stage-top,.stage-bottom{position:absolute;left:24px;right:24px;display:flex;justify-content:space-between;align-items:center;pointer-events:none}.stage-top{top:21px;color:#aac0bc;font-size:10px;letter-spacing:.17em}.stage-bottom{bottom:19px;color:#899e9a;font-size:10px;letter-spacing:.09em}.stage-bottom button{pointer-events:auto;border:1px solid var(--line);background:#102126c4;color:var(--cream);padding:8px 16px}.legend{position:absolute;top:56px;left:24px;font-size:10px;letter-spacing:.1em;color:#a4b6af}.sep{padding:0 10px;color:#5a7378}.hint{position:absolute;left:50%;top:51%;transform:translate(-50%,-50%);padding:9px 13px;background:#091619b8;font-size:12px;color:#e2d7c4;opacity:0;transition:opacity .3s;pointer-events:none}.inspector{background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;max-height:745px;overflow:auto}.panel-header{padding:24px 22px 20px;border-bottom:1px solid var(--line)}.panel-header strong{display:block;margin:12px 0 4px;font:23px/1.15 Georgia}.panel-header p,.detail p{color:var(--muted);font-size:12px;margin-bottom:0}.panel-section{border-bottom:1px solid var(--line);padding:17px 22px}.field-label{display:block;color:var(--mint);font-size:10px;letter-spacing:.13em;font-weight:800;margin:0 0 9px}.field-label output{float:right;color:var(--gold)}input[type=search],input#searchPart{width:100%;background:#0c1b20;border:1px solid #2a4446;border-radius:0;color:var(--cream);padding:11px 12px;font-size:12px}.result-list{max-height:102px;overflow:auto;margin-top:7px}.result-list button{display:block;width:100%;background:none;color:#b7c5c0;text-align:left;border:0;border-bottom:1px solid #25404638;padding:5px 4px;font-size:11px}.result-list button:hover{color:var(--gold)}.detail h3{margin:10px 0;font:19px/1.2 Georgia}.detail .micro,.micro{font-size:11px!important;color:#829b96!important}.part-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.part-meta span{padding:5px 6px;background:#1c3339;color:var(--mint);font-size:9px}.part-actions{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0 0}.part-actions button{background:#234048;border:1px solid #33535a;color:#d6e1d8;font-size:11px;padding:7px 9px}.part-actions button:hover{border-color:var(--gold)}.hidden{display:none!important}.sliderlabel{display:block;color:#a9bcb7;font-size:11px;margin:10px 0}.sliderlabel output{float:right;color:var(--cream)}input[type=range]{width:100%;accent-color:var(--gold);cursor:pointer;margin:9px 0}.note{float:right;color:#a08c79;font-size:9px}.readouts{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:13px}.readouts>div{padding:10px;background:#0a1a1f}.readouts span{display:block;color:var(--muted);letter-spacing:.07em;font-size:8px}.readouts strong{color:var(--cream);font-size:17px;font-weight:700}.mathnote{font-size:10px;line-height:1.55;color:#8ca59b}.assembly-status{display:flex;justify-content:space-between;font-size:12px}.assembly-status b{color:var(--gold)}.progress{height:3px;background:#31434a;margin:12px 0}.progress div{width:8%;height:100%;background:var(--gold)}.panel-bottom{margin-top:auto;display:flex;justify-content:space-between;gap:4px;padding:11px 22px;color:#6d8a87;font-size:9px;letter-spacing:.07em}.learning{margin-top:75px;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.learning h2,.quiz h2{font:400 clamp(28px,3vw,43px)/1.2 Georgia;margin:14px 0}.learning p{color:var(--muted);max-width:620px;font-size:14px}.callouts{border-top:1px solid var(--line)}.callouts>div{padding:17px 4px;display:grid;grid-template-columns:45px 145px 1fr;gap:7px;border-bottom:1px solid var(--line);align-items:center}.callouts b{color:var(--gold);font:24px Georgia}.callouts strong{font-size:11px;letter-spacing:.1em}.callouts span{font-size:12px;color:var(--muted)}.quiz{margin-top:68px;padding:30px;border:1px solid var(--line);background:#102027}.quiz h2{margin-bottom:20px}.quizitem{padding:13px 0;border-top:1px solid var(--line)}.quizitem legend{font-weight:700;font-size:13px;margin-bottom:10px}.quizitem label{display:inline-flex;align-items:center;gap:5px;font-size:12px;margin:5px 20px 5px 0;color:#bccac5}.quizitem input{accent-color:var(--gold)}.quizfooter{display:flex;align-items:center;gap:15px;margin-top:18px}.quizfooter button{border:0;background:var(--gold);padding:11px 19px;font-weight:800;color:#1b2426}.quizfooter span{color:var(--mint)}.sources{margin:70px 0 34px;border-top:1px solid var(--line);padding:25px 0;max-width:1000px}.sources strong{font-size:11px;color:var(--gold);letter-spacing:.15em}.sources p{color:var(--muted);font-size:12px}.sourcelinks{display:flex;gap:18px;flex-wrap:wrap}.sourcelinks a{font-size:12px;color:var(--mint)}footer{padding:25px 0;border-top:1px solid var(--line);color:#637e7b;letter-spacing:.1em;font-size:10px}@media(max-width:1100px){.viewer-body{grid-template-columns:minmax(0,1fr) 295px}.mode{padding:16px 10px}.inspector{max-height:645px}.callouts>div{grid-template-columns:40px 110px 1fr}}@media(max-width:800px){.viewer-body{display:block}.stage{height:65vw;min-height:400px}.inspector{max-height:none;border-left:0;border-top:1px solid var(--line)}.panel-header{padding:16px 18px}.modebar{overflow-x:auto;white-space:nowrap}.mode{flex:0 0 auto}.mode b{font-size:11px}.learning{grid-template-columns:1fr;gap:24px}.intro{padding:30px 0}.mark{display:none}.stage-bottom span{font-size:9px}.panel-section{padding:16px 18px}}@media(max-width:530px){.top{height:67px}.brand strong{font-size:14px}.brand small{font-size:8px}.righthead>a{display:none}.intro h1{font-size:43px}.intro p{font-size:13px}.stage{min-height:330px;height:62vh;max-height:470px}.stage-top{left:12px;right:12px}.stage-top span{font-size:8px}.stage-bottom{left:11px;right:11px}.stage-bottom span{font-size:8px;max-width:215px}.stage-bottom button{padding:6px 9px;font-size:11px}.legend{left:12px;top:42px;font-size:8px}.callouts>div{grid-template-columns:27px 92px 1fr}.callouts b{font-size:20px}.callouts strong,.callouts span{font-size:10px}.quiz{padding:18px}.quizitem label{display:flex}.learning{margin-top:44px}.sources{margin-top:44px}}@media(max-height:500px) and (min-width:800px){.stage{min-height:450px}.viewer-body{min-height:450px}}
.stage>canvas{position:absolute;inset:0;width:100%;height:100%}