@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{font-family:'DM Sans',sans-serif;color:#203a3b;background:#f8faf9;font-size:16px;font-synthesis:none;--teal:#086b68;--line:#dce4e1;--muted:#657b79}*{box-sizing:border-box}body{margin:0}button,select,input{font:inherit}button,select{cursor:pointer}button{color:inherit;background:transparent;border:1px solid var(--line);border-radius:6px;padding:9px 13px}button:hover{background:#e3eeea}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #008e86;outline-offset:3px}header{height:78px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 32px;gap:50px;background:#fff}.brand{font:800 27px 'Manrope',sans-serif;letter-spacing:-1.5px;color:#154541;text-decoration:none}.brand span{font-weight:400}.edition{font-size:12px;letter-spacing:2px;color:var(--muted)}.text-button{margin-left:auto;border:0;font-size:14px}main{display:grid;grid-template-columns:240px minmax(380px,1fr) 355px;min-height:760px}.navigation{padding:32px 20px 24px 28px;border-right:1px solid var(--line);background:#fff}.eyebrow{font-size:11px;letter-spacing:1.8px;font-weight:700;color:var(--teal)}h1{font:500 48px/1.08 'Manrope',sans-serif;letter-spacing:-2.5px;margin:18px 0}p{font-size:16px;line-height:1.65;margin:12px 0}.intro p{font-size:14px;color:var(--muted);margin-bottom:25px}nav{display:flex;flex-direction:column;gap:6px}nav button{text-align:left;border:0;padding:12px 10px;display:flex;align-items:center;gap:12px;font-size:14px}nav button .chapter-icon{width:25px;font-size:21px;color:#6b928c}nav button.active{background:#e5f1ec;color:#096862;font-weight:700}nav button.active .chapter-icon{color:#096862}.level-control{margin-top:30px;border-top:1px solid var(--line);padding-top:23px}.level-control label{font-size:14px;font-weight:600}.level-control select{width:100%;margin-top:10px;font-size:13px;padding:12px 4px;border:1px solid var(--line);border-radius:5px;background:#fff;color:#203a3b}.level-control p{font-size:12px;color:var(--muted)}.workspace{background:#eef3f0;display:flex;flex-direction:column;min-width:0}.scene-top{display:flex;justify-content:space-between;align-items:center;padding:20px 22px 0;gap:10px;z-index:2}.scene-top>span{font-size:11px;letter-spacing:1.5px;color:var(--muted)}.scene-top button{font-size:12px;border:0;padding:7px 9px}.scene-top button[aria-pressed=true]{background:#d9e8e0}#viewport{height:540px;position:relative;overflow:hidden;flex:1;min-height:420px}canvas{display:block;width:100%;height:100%;touch-action:none}#label-layer{position:absolute;inset:0;pointer-events:none;overflow:hidden}.model-label{position:absolute;transform:translate(-50%,-50%);background:#fffffff0;padding:5px 9px;border:1px solid #cfdbd3;border-radius:4px;font-size:12px;white-space:nowrap;pointer-events:auto;box-shadow:0 3px 8px #173e3910;cursor:pointer}.model-label:before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--label-color,#1d8b7c);margin-right:6px}.scene-caption{position:absolute;top:28px;left:28px;pointer-events:none;max-width:70%}.scene-caption>span{font-size:10px;letter-spacing:1.7px;color:#57817a}.scene-caption h2{font:500 25px/1.25 'Manrope',sans-serif;letter-spacing:-.8px;margin-top:10px}.orbit-hint{position:absolute;bottom:12px;left:0;right:0;text-align:center;color:#768c84;font-size:11px}.transport{display:flex;align-items:center;gap:14px;background:#ffffffab;padding:14px 22px;border-top:1px solid #dfe7e1}.transport button{border:0;font-size:22px;padding:4px}.timeline{flex:1}.timeline span{font-size:12px;color:#53746e;display:block;margin-bottom:6px}input[type=range]{width:100%;accent-color:var(--teal);height:4px;display:block}.transport select{font-size:12px;background:transparent;border:0}.scene-options{padding:15px 20px 9px;display:flex;flex-wrap:wrap;gap:14px;align-items:center}#conditions{display:flex;gap:3px;background:#e0e9e3;padding:4px;border-radius:7px}#conditions button{font-size:12px;padding:8px;border:0}#conditions .selected{background:#fff;box-shadow:0 1px 3px #1232}.scene-options>span{font-size:10px;color:#6b817b}.legend{display:flex;gap:14px;flex-wrap:wrap;padding:9px 24px 20px;font-size:12px;color:#55736c}.legend span:before{content:'';display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--dot);margin-right:6px}.explanation{padding:27px 26px 22px;background:#fff;border-left:1px solid var(--line);display:flex;flex-direction:column}.reading-head{display:flex;justify-content:space-between;font-size:10px;letter-spacing:1px;color:#6e8580;gap:12px}.reading-head span:last-child{color:var(--teal)}.explanation>h2{font:600 28px/1.25 'Manrope',sans-serif;letter-spacing:-1px;margin:25px 0 8px}#lesson-body p{font-size:15px;line-height:1.7;color:#45605c}.focus-card{margin-top:20px;background:#f1f6f2;border:1px solid #e4ece6;padding:16px;border-radius:8px}#process-steps{display:flex;flex-direction:column;margin-top:10px;gap:5px}#process-steps button{text-align:left;border:0;font-size:13px;padding:9px 6px;color:#72847d;border-left:2px solid #cad8ce;border-radius:0}#process-steps button.current{color:#086b68;border-left-color:#086b68;background:#e3eee5}.inspect-card{margin-top:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px;color:#4f6c63}.inspect-card strong{display:block;color:#22574d;margin-bottom:5px}.lesson-sources{font-size:11px;line-height:1.9;padding:16px 0}.lesson-sources a{color:#54766c;margin-right:10px}.chapter-actions{display:flex;justify-content:space-between;margin-top:auto;padding-top:16px;gap:8px}.chapter-actions button{font-size:13px}.chapter-actions #next{background:#086b68;color:#fff;border-color:#086b68}.chapter-actions button:disabled{opacity:.4;cursor:default}.below{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);padding:35px 7%;gap:8%;background:#fff}.below h2{font:500 25px 'Manrope',sans-serif;letter-spacing:-.8px}.below p{color:#536b66;font-size:15px}footer{padding:23px 32px;font-size:11px;color:#70867f;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:30px}dialog{max-width:830px;width:calc(100% - 30px);max-height:85vh;padding:30px;border:1px solid var(--line);border-radius:12px;color:#24463c}dialog::backdrop{background:#12352d88;backdrop-filter:blur(5px)}.dialog-top{display:flex;align-items:center;justify-content:space-between}.dialog-top h2{font:500 28px 'Manrope',sans-serif}.dialog-top button{border:0}#all-sources article{border-top:1px solid var(--line);padding:15px 0}#all-sources a{font-weight:600;color:#086b68}#all-sources p,.fine{font-size:13px}#scene-fallback{position:absolute;top:48%;padding:30px;line-height:1.7}.stat-compare{display:flex;gap:12px;margin-top:14px}.stat-compare div{flex:1;background:#edf3ef;padding:13px}.stat-compare strong{font-size:25px;display:block}.stat-compare span{font-size:12px}.evidence-note{font-size:12px!important;color:#71847b!important}@media(min-width:1600px){main{grid-template-columns:265px minmax(380px,1fr) 400px;min-height:840px}#viewport{min-height:570px}.explanation{padding:30px 34px}}@media(max-width:1150px){main{grid-template-columns:205px minmax(300px,1fr) 305px}.navigation{padding-left:20px}.explanation{padding:24px 20px}.scene-caption h2{font-size:21px}.scene-options{padding-left:12px}header{gap:25px}}@media(max-width:950px){main{grid-template-columns:195px 1fr}.explanation{grid-column:1/-1;display:block;padding:28px 7%}.explanation>h2{margin-top:16px}.chapter-actions{margin-top:20px}.workspace{min-height:630px}.reading-head{justify-content:flex-start;gap:25px}.focus-card{max-width:650px}.edition{display:none}#viewport{min-height:440px}.below{gap:5%}}@media(max-width:600px){header{height:66px;padding:0 18px}.brand{font-size:25px}.text-button{font-size:12px;padding:6px}main{display:block}.navigation{padding:20px 18px 12px}.intro{display:none}nav{flex-direction:row;overflow-x:auto;gap:5px;padding-bottom:8px}nav button{white-space:nowrap;padding:8px;font-size:12px}nav button .chapter-icon{display:none}.level-control{margin:8px 0 0;padding:8px 0;border-top:0;display:flex;align-items:center;gap:10px}.level-control label{font-size:12px;white-space:nowrap}.level-control select{margin:0;font-size:12px;padding:9px}.level-control p{display:none}.workspace{min-height:570px}#viewport{height:400px;min-height:400px}.scene-top{padding:12px 14px 0}.scene-caption{left:18px;top:22px}.scene-caption h2{font-size:21px}.scene-caption>span{font-size:9px}.model-label{font-size:10px;padding:4px 6px}.transport{padding:13px 15px}.scene-options{padding:12px 14px 5px;gap:8px}#conditions{width:100%}#conditions button{flex:1}.legend{padding:9px 15px 16px;gap:11px;font-size:11px}.explanation{padding:25px 22px}.below{grid-template-columns:1fr;padding:30px 22px;gap:25px}footer{padding:20px 22px;line-height:1.6}footer span{display:none}dialog{padding:20px}.dialog-top h2{font-size:23px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
/* Detailed model stage */
.workspace{background:#f1f0ed}.scene-top{gap:8px;padding-top:15px}.scene-top>div{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:2px}.scene-top>span{max-width:155px;line-height:1.5}.scene-top select{font-size:12px;padding:7px 5px;background:#ffffffa8;border:1px solid #d9dcd6;border-radius:5px;max-width:185px;color:#375c53}.scene-caption{top:20px}.scene-caption h2{font-size:23px}.scene-caption>span{font-size:10px}#viewport{min-height:560px}.scene-options>span{font-size:11px}#fidelity-label{padding:0 24px 14px;font-size:10px;letter-spacing:1.5px;color:#687c72}.legend{padding-bottom:10px}#model-loading{position:absolute;left:50%;top:53%;transform:translate(-50%,-50%);padding:14px 20px;border:1px solid #d8ded8;border-radius:7px;background:#fffffff0;font-size:14px;color:#55746a;text-align:center;width:max-content;max-width:85%;box-shadow:0 8px 30px #183d3010}#model-dialog figure{margin:20px 0}#model-dialog img{width:100%;max-height:55vh;object-fit:contain;background:radial-gradient(ellipse at 50% 40%,#fff,#eceeea);border-radius:8px}#model-dialog figcaption{font-size:12px;color:#667e74;line-height:1.6;margin-top:10px}#model-dialog a{color:#086b68}#model-dialog summary{cursor:pointer;font-weight:600;padding:15px 0}.reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.reference-grid figure:last-child{grid-column:1/-1}.reference-grid img{height:240px;object-fit:contain}button:disabled{pointer-events:none}canvas:focus-visible{outline-offset:-4px}@media(min-width:1200px){main{grid-template-columns:215px minmax(460px,1fr) 330px}.navigation{padding-left:24px}.explanation{padding:26px 23px}}@media(min-width:1600px){main{grid-template-columns:240px minmax(550px,1fr) 390px}#viewport{min-height:660px}}@media(max-width:950px){#viewport{min-height:500px}.scene-top{padding-left:16px;padding-right:14px}.scene-top>span{font-size:10px}.scene-top button{padding:6px}.scene-caption{max-width:58%}.scene-caption h2{font-size:21px}}@media(max-width:600px){#viewport{min-height:430px}.scene-top{align-items:flex-start}.scene-top>span{max-width:110px;font-size:9px}.scene-top>div{max-width:230px}.scene-top select{max-width:168px;font-size:11px}.scene-top button{font-size:11px}.scene-caption{top:14px}.scene-caption h2{font-size:20px}.scene-caption>span{font-size:8px}.reference-grid{display:block}#fidelity-label{font-size:9px;padding-left:15px}.model-label{white-space:normal;max-width:160px;width:max-content;text-align:left}}