@font-face{font-family:Manrope;src:url(assets/manrope.ttf);font-display:swap}*{box-sizing:border-box}body{margin:0;background:#f1eee5;color:#253138;font-family:Manrope,Arial,sans-serif;overflow-anchor:none}button,select,a{font:inherit}button,select{border:0;background:none;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #1558a6;outline-offset:4px}header{height:80px;padding:14px 42px;display:flex;align-items:center;gap:26px;position:fixed;inset:0 0 auto;z-index:20;background:#f1eee5ef;border-bottom:1px solid #26343d24}.brand{display:flex;align-items:center;gap:14px;margin-right:auto;font-size:12px;font-weight:800;letter-spacing:.14em;color:inherit;text-decoration:none}.brand img{width:48px;height:46px;object-fit:contain}.edition{font-size:12px;color:#637077}header select,header button{font-size:13px;padding:12px 0}#motion{text-decoration:underline;text-underline-offset:5px}#scroll-world{height:1400vh}#pin{position:sticky;top:0;height:100vh;overflow:hidden}#world{width:100%;height:100%;display:block}#pin:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#f1eee5 0%,#f1eee5ed 20%,#f1eee500 42%);z-index:1}.editorial{position:absolute;left:5%;top:16%;width:34%;z-index:3;pointer-events:none}#kicker{font-size:13px;letter-spacing:.14em;font-weight:800;color:#1558a6;margin:0 0 22px}h1{font-size:clamp(42px,4.8vw,78px);font-weight:650;letter-spacing:-.05em;line-height:1.04;margin:0 0 24px}#caption{font-size:21px;line-height:1.5;max-width:360px;color:#566369;margin:0}#loading{position:absolute;inset:0;display:grid;place-items:center;background:#f1eee5;z-index:30;font-size:22px}.bottom{position:absolute;left:5%;right:5%;bottom:92px;display:flex;justify-content:space-between;align-items:center;gap:20px;z-index:4}#annotation{font-size:15px;max-width:50%;color:#53626a}.controls{display:flex;gap:8px}.controls button{height:48px;border:1px solid #9da6a8;padding:10px 18px;background:#f1eee5e6;font-size:13px}.controls button:first-child,.controls button:last-child{width:48px;font-size:23px;padding:0}.rail{position:absolute;left:5%;right:5%;bottom:34px;display:flex;gap:16px;align-items:center;z-index:4;font-size:12px;color:#5c6870}.rail>div{height:2px;background:#26343d30;flex:1}.rail i{height:2px;display:block;background:#1558a6;width:0}#leaders{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:4}#leaders path{fill:none;stroke:#375766;stroke-width:1.25}#leaders circle{fill:#1558a6}.node-label{position:absolute;font-size:16px;font-weight:650;line-height:1.25;color:#263e4b;z-index:5;pointer-events:none;background:#f1eee5e8;padding:5px 8px;max-width:205px}.node-label small{display:block;font-size:11px;font-weight:500;letter-spacing:.04em;margin-top:4px;color:#647176}#material-controls{position:absolute;z-index:6;left:5%;bottom:185px;max-width:34%}.material-tabs{display:flex;gap:8px}.material-tabs button{font-size:17px;border-bottom:2px solid #a4aaa9;padding:10px 14px}.material-tabs button[aria-pressed=true]{border-color:#1558a6;color:#1558a6;font-weight:800}#material-note{font-size:18px;line-height:1.4;margin:15px 0 8px}#material-controls small{color:#637077;font-size:12px}.after{max-width:1200px;margin:auto;padding:100px 6%;font-size:20px;line-height:1.6}.after h2{font-size:58px;line-height:1.1;letter-spacing:-.04em;margin:20px 0}.eyebrow{font-size:12px;letter-spacing:.14em;color:#1558a6;font-weight:800}.after p{max-width:730px}.links{display:flex;gap:26px;flex-wrap:wrap;margin:35px 0}.links a{color:#1558a6}.note{font-size:13px;color:#667178}details{font-size:17px;margin:40px 0}#debug{position:absolute;right:12px;top:90px;background:#16323deb;color:#e6f0e6;padding:12px;z-index:30;font:11px/1.5 monospace;pointer-events:none}#seek{position:absolute;right:12px;top:335px;z-index:31;background:#16323d;color:white;padding:12px;max-width:200px}.reduced #scroll-world{height:100vh}.reduced #play{display:none}.reduced .rail>span:last-child{visibility:hidden}[hidden]{display:none!important}
@media(max-width:1100px){.edition{display:none}.brand span{display:none}header{padding:12px 24px}h1{font-size:48px}.editorial{width:37%}#caption{font-size:18px}.node-label{font-size:14px}}
@media(max-width:1100px) and (orientation:portrait){.editorial{top:110px;left:24px;right:24px;width:auto;max-width:640px}#caption{max-width:530px}#pin:after{background:linear-gradient(180deg,#f1eee5 0%,#f1eee5e0 23%,#f1eee500 42%)}#material-controls{left:24px;bottom:auto;top:315px;max-width:90%}.bottom{left:24px;right:24px;bottom:72px}.bottom #annotation{max-width:50%}.rail{left:24px;right:24px}.node-label{font-size:14px;max-width:175px}}
@media(max-width:700px){header{height:64px;padding:8px 18px;gap:18px}.brand img{width:38px;height:38px}header select,header button{font-size:11px}.editorial{top:96px;left:20px;right:20px}#kicker{font-size:10px;margin-bottom:14px}h1{font-size:39px;margin-bottom:16px}#caption{font-size:16px;line-height:1.4;max-width:345px}.bottom{left:20px;right:20px;bottom:53px;display:block}#annotation{display:none}.controls{justify-content:space-between}.controls button{height:44px;padding:8px 14px;font-size:12px}.rail{left:20px;right:20px;bottom:24px}.rail>span:last-child{display:none}#scroll-world{height:1100vh}#material-controls{left:20px;top:285px;max-width:calc(100% - 40px)}.material-tabs button{font-size:14px;padding:7px 10px}#material-note{font-size:14px;margin:10px 0 5px}#material-controls small{font-size:10px}.node-label{font-size:12px;padding:3px 5px;max-width:135px}.node-label small{font-size:9px}.after{padding:70px 24px;font-size:17px}.after h2{font-size:40px}#debug{top:66px;font-size:9px;right:3px}#seek{top:auto;bottom:130px;font-size:11px}.reduced #scroll-world{height:100vh}}

#cad-ui{position:absolute;left:43%;right:3%;top:14%;bottom:20%;border:1px solid #81959580;border-radius:8px;pointer-events:none;z-index:2;box-shadow:0 8px 35px #26343d08}.cad-top{display:flex;gap:20px;align-items:center;padding:12px 16px;border-bottom:1px solid #81959550;background:#e4e8e1e8;font-size:11px}.cad-top b{color:#1558a6}.cad-top span:last-child{margin-left:auto}.cad-tree{position:absolute;top:66px;left:16px;font-size:11px;color:#526365}.cad-tree small{letter-spacing:.12em;font-size:9px}.cad-tree p{margin:12px 0}.cad-axis{position:absolute;bottom:16px;left:16px;display:flex;gap:12px;font:12px monospace}.cad-axis b:nth-child(1){color:#b56450}.cad-axis b:nth-child(2){color:#5f8766}.cad-axis b:nth-child(3){color:#1558a6}.cad-axis span{margin-left:10px}.cad-active .node-label{font:600 17px monospace;color:#1558a6}
@media(max-width:1100px) and (orientation:portrait){#cad-ui{left:3%;right:3%;top:36%;bottom:15%}.cad-tree{font-size:10px}.cad-top span:last-child{display:none}.cad-active .node-label{font-size:14px}}
@media(max-width:700px){#cad-ui{top:37%;bottom:15%}.cad-tree{top:50px;font-size:9px}.cad-tree p{margin:9px 0}.cad-top{font-size:10px;padding:9px}.cad-axis{font-size:10px}.cad-active .node-label{font-size:12px}}

.cad-tree{padding:10px;background:#edf0e8e8;border-left:2px solid #1558a640}.cad-top{font-size:12px}.cad-axis{background:#edf0e8d9;padding:5px}

.cad-tree p{transition:background .2s,color .2s;padding:5px 7px;margin:5px -5px}.cad-tree p.active{background:#1558a618;color:#1558a6;box-shadow:inset 2px 0 #1558a6}.cad-tree b{font-weight:600;font-variant-numeric:tabular-nums}#cad-operation{color:#1558a6}#slicer-ui{position:absolute;z-index:3;left:43%;right:3%;top:14%;bottom:20%;border:1px solid #71909780;border-radius:8px;pointer-events:none}.slicer-title{padding:13px 17px;background:#e2e8e4dd;border-bottom:1px solid #71909750;font-size:13px}.slicer-title span{float:right;color:#536870;font-size:11px}.slicer-legend{display:flex;gap:14px;font-size:11px;padding:15px 17px;color:#45616e}.slicer-legend span:before{content:'';display:inline-block;width:12px;height:3px;background:#316b95;margin-right:6px;vertical-align:middle}.slicer-legend span:nth-child(2):before{background:#b97636}.slicer-legend span:nth-child(3):before{background:#e99945}.slicer-layer{position:absolute;left:17px;right:17px;bottom:30px;display:flex;gap:12px;align-items:center;font-size:12px;background:#f1eee5ea;padding:10px;pointer-events:auto}.slicer-layer input{min-width:50px;flex:1;accent-color:#1558a6;cursor:ew-resize}.slicer-layer b{font-weight:600;font-variant-numeric:tabular-nums}.slicer-note{position:absolute;bottom:0;left:27px;font-size:10px;color:#637078}
@media(max-width:1100px) and (orientation:portrait){#slicer-ui{left:3%;right:3%;top:36%;bottom:15%}.slicer-legend{font-size:10px;gap:10px;flex-wrap:wrap}.slicer-layer{display:grid;grid-template-columns:1fr 1fr;gap:8px}.slicer-layer input{grid-column:1/-1;grid-row:2;width:100%}.slicer-layer>span{text-align:right}.slicer-note{font-size:9px}}
@media(max-width:700px){#slicer-ui{top:37%;bottom:15%}.slicer-title{font-size:11px;padding:10px}.slicer-title span{font-size:9px}.slicer-legend{padding:10px;font-size:9px;gap:8px}.slicer-layer{left:7px;right:7px;font-size:11px;bottom:24px;padding:6px}.slicer-note{left:15px}.cad-tree p{padding:3px 4px}}
/* Release shell; scene geometry and camera choreography stay intact */
html{scroll-padding-top:96px}button,select,input,a{-webkit-tap-highlight-color:transparent}header select,header button{min-height:44px}.top-lesson{font-size:13px;color:#1558a6;text-decoration:none;border-bottom:1px solid #1558a660;padding:12px 0}.skip-link{position:fixed;top:-80px;left:20px;z-index:99;padding:12px 20px;background:#1558a6;color:#fff}.skip-link:focus{top:12px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.chapter-control{position:absolute;left:5%;bottom:150px;z-index:6}.chapter-control select{max-width:290px;border-bottom:1px solid #81959580;padding:10px 28px 10px 0;font-size:12px;min-height:44px}.scene-fallback{display:none;position:absolute;inset:90px 5% 30px;z-index:8;flex-direction:column;align-items:center;justify-content:center;background:#f1eee5;text-align:center}.scene-fallback img{width:min(800px,100%);max-height:65%;object-fit:contain}.scene-fallback p{max-width:520px;font-size:18px}.scene-fallback a{color:#1558a6}.no-webgl #scroll-world{height:80vh}.no-webgl #pin{height:80vh}.no-webgl .scene-fallback{display:flex}.no-webgl .editorial,.no-webgl .bottom,.no-webgl .rail,.no-webgl .chapter-control,.no-webgl #labels,.no-webgl #leaders,.no-webgl #cad-ui,.no-webgl #slicer-ui,.no-webgl #material-controls,.no-webgl #world{display:none!important}.learning{border-top:1px solid #26343d24;padding-top:90px;padding-bottom:56px}.learning h2{max-width:900px;font-size:clamp(34px,4.2vw,54px)}.learning>article>p{color:#566369;max-width:850px}.learning-steps{list-style:none;padding:0;margin:56px 0;display:grid;grid-template-columns:1fr 1fr;gap:0 52px}.learning-steps li{display:flex;gap:20px;padding:28px 0;border-top:1px solid #26343d30}.step-no{color:#1558a6;font-size:16px;font-variant-numeric:tabular-nums;padding-top:4px}.learning-steps h3,.ai-note h3{font-size:22px;font-weight:700;margin:0 0 12px;line-height:1.3}.learning-steps p,.ai-note p{font-size:17px;line-height:1.6;color:#566369;margin:0}.ai-note{padding:28px 32px;border-left:3px solid #1558a6;background:#e5e9e4}.booking-next{padding-top:30px}.booking-next .links a:first-child{background:#1558a6;color:#fff;text-decoration:none;padding:15px 22px;border-radius:8px}.booking-next .links{align-items:center}summary{cursor:pointer;padding:14px 0;min-height:44px}#reading li{margin:16px 0}.node-label small{font-size:12px;letter-spacing:0}#material-controls{bottom:205px}.rail{padding-bottom:env(safe-area-inset-bottom)}
@media(max-width:1100px){header{gap:20px}.top-lesson{font-size:12px}}
@media(max-width:1100px) and (orientation:portrait){.chapter-control{left:auto;right:24px;bottom:136px}.chapter-control select{max-width:260px}.learning-steps{gap:0 28px}}
@media(max-width:700px){header{gap:10px}.top-lesson{font-size:11px;max-width:85px;line-height:1.35}header select{max-width:98px}header button{font-size:10px}.chapter-control{left:20px;right:auto;bottom:108px}.chapter-control select{max-width:260px;font-size:10px;min-height:36px}.node-label small{font-size:10px}.learning{padding-top:50px}.learning-steps{display:block;margin-top:32px}.learning-steps li{gap:16px;padding:22px 0}.learning-steps h3,.ai-note h3{font-size:21px}.learning-steps p,.ai-note p{font-size:16px}.ai-note{padding:22px 20px}.booking-next h2{font-size:36px}.scene-fallback{inset:75px 20px 20px}.scene-fallback p{font-size:16px}.controls button{border-radius:6px}#material-controls{bottom:auto}}
@media(max-height:600px) and (orientation:landscape){header{height:54px;padding:4px 24px}.brand img{height:38px;width:38px}.editorial{top:72px}h1{font-size:34px;margin-bottom:12px}#caption{font-size:15px;max-width:300px}#kicker{font-size:10px;margin-bottom:10px}.bottom{bottom:48px}.rail{bottom:18px}.chapter-control{bottom:100px}.node-label{font-size:12px}.node-label small{font-size:10px}#material-controls{bottom:145px}#material-note{font-size:13px;margin:6px 0}.material-tabs button{padding:6px 9px;font-size:13px}#cad-ui,#slicer-ui{top:18%;bottom:23%}.cad-tree{font-size:9px;top:44px}.cad-tree p{margin:2px 0;padding:1px 4px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}