:root{color-scheme:dark;--bg:#09161e;--panel:#10232d;--edge:#2b404a;--fg:#e7f1f1;--muted:#91aab5;--mint:#67e3c1;--amber:#eabc7b;--blue:#72c9ee}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{border:1px solid var(--edge);background:#172b35;color:var(--fg);padding:9px 13px;border-radius:7px;cursor:pointer;min-height:42px;font-size:14px}button:hover{border-color:var(--mint)}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,#canvasHost:focus-visible{outline:2px solid var(--mint);outline-offset:4px}button[aria-pressed=true]{background:#24443f;color:var(--mint);border-color:#4a8070}a{color:var(--mint);text-decoration:none}header{max-width:1600px;margin:auto;height:76px;padding:0 36px;border-bottom:1px solid var(--edge);display:flex;align-items:center;justify-content:space-between}.brand{font-size:21px;letter-spacing:2px;color:var(--fg);font-weight:750}.brand span{font:12px ui-monospace,monospace;color:var(--muted);letter-spacing:1px;margin-left:20px}.back{font-size:14px;color:var(--muted)}main{max-width:1600px;margin:auto;padding:26px 36px}.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.eyebrow{font:12px/1.4 ui-monospace,monospace;letter-spacing:2px;color:var(--mint);margin:0 0 10px}h1{font-size:34px;letter-spacing:-1px;line-height:1.25;margin:0 0 8px;font-weight:650}h1 span{font-weight:350;color:#b8cdd4}h2{font-size:22px;line-height:1.4;margin:8px 0 15px}h3{font-size:17px;margin:10px 0}p{margin:8px 0 15px}.intro p:not(.eyebrow){color:var(--muted);margin:0}.intro-note{text-align:right;font-size:14px;color:#c7d8dc}.intro-note small{font-size:12px;color:var(--muted)}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--mint);margin-right:5px}.workbench{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px;align-items:stretch}.viewer{border:1px solid var(--edge);border-radius:14px;background:radial-gradient(ellipse at 50% 30%,#213845 0%,#0c1d27 70%);overflow:hidden;position:relative;min-width:0}.viewer-top{display:flex;justify-content:space-between;align-items:center;padding:18px;gap:10px;position:relative;z-index:2}.seg{display:flex;gap:5px}.seg button{font-size:14px;min-height:40px;background:#0d202b}.model-badge{font-size:12px;letter-spacing:1px;color:var(--muted)}#canvasHost{height:490px;position:relative;outline-offset:-3px;touch-action:pan-y}#canvasHost canvas{display:block;touch-action:none;width:100%;height:100%}#loading{position:absolute;inset:35% 10% auto;text-align:center;color:var(--muted);z-index:3}.axis-note{position:absolute;bottom:12px;left:20px;font:11px/1.8 ui-monospace,monospace;color:#72909d;pointer-events:none}#labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}.part-label{position:absolute;transform:translate(-50%,-50%);white-space:nowrap;pointer-events:auto;padding:5px 9px;min-height:32px;font-size:12px;border-radius:5px;background:#0a1b24db;backdrop-filter:blur(8px);color:#c8dadf;box-shadow:0 2px 10px #0003}.part-label.selected{background:#245144;color:#a9ffe5;border-color:var(--mint)}.viewer-bottom{padding:8px 18px 15px;display:flex;justify-content:space-between;gap:10px;align-items:center}.view-actions{display:flex;gap:5px}.view-actions button{padding:7px 10px;font-size:12px;min-height:36px;background:#0c2029}.hint{font-size:12px;color:var(--muted)}.explode-control{border-top:1px solid var(--edge);padding:16px 22px;background:#0c1d26}.explode-control>div:first-child{display:flex;justify-content:space-between;font-size:14px}output{font:14px ui-monospace,monospace;color:var(--mint)}input[type=range]{width:100%;accent-color:var(--mint);height:22px;margin:5px 0}.range-caption{display:flex;justify-content:space-between;color:#8ba4af;font-size:12px}.toggles{display:flex;gap:22px;margin-top:10px;flex-wrap:wrap;font-size:13px;color:#b9ccd3}input[type=checkbox]{accent-color:var(--mint);width:15px;height:15px;vertical-align:middle}.learning{background:var(--panel);border:1px solid var(--edge);border-radius:14px;overflow:hidden;min-width:0}.mode-tabs{display:flex;border-bottom:1px solid var(--edge);padding:8px;gap:4px}.mode-tabs button{flex:1;border:0;background:transparent;border-radius:7px;padding:11px 4px;white-space:nowrap}.mode-tabs button[aria-pressed=true]{background:#233e3b;color:var(--mint)}#learningContent{padding:21px}.field{display:block;font-size:13px;color:var(--muted);margin-bottom:15px}.field select{display:block;width:100%;padding:10px 11px;margin-top:7px;background:#0b1c26;color:var(--fg);border:1px solid #3b5360;border-radius:7px;font-size:15px}.type-note{font-size:14px;color:var(--muted);border-bottom:1px solid var(--edge);padding-bottom:16px;margin-bottom:17px}.parts{display:grid;grid-template-columns:1fr 1fr;gap:7px}.parts button{text-align:left;padding:8px 9px;font-size:13px;line-height:1.6}.parts button small{font-size:11px;color:var(--muted);margin-right:6px}.part-detail{margin-top:19px;padding:17px 0 0;border-top:1px solid var(--edge)}.part-detail .eyebrow{font-size:11px}.part-detail h2{font-size:22px;margin:4px 0 9px}.part-detail p{font-size:15px;color:#c1d2d8}.tip{font-size:13px!important;background:#0c1d27;border-left:2px solid var(--mint);padding:12px;color:#97b4bc!important}.connection{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);margin-bottom:16px}.connection button{padding:5px 10px;min-height:32px;font-size:12px}.cycle-states{display:flex;gap:6px;margin:14px 0}.cycle-states button{flex:1}.big-action{width:100%;background:var(--mint);color:#092b24;border:none;font-weight:700;margin:10px 0}.legend{display:flex;gap:12px;font-size:12px;color:var(--muted);flex-wrap:wrap;margin:15px 0}.legend i{display:inline-block;width:7px;height:7px;background:var(--mint);border-radius:50%;margin-right:5px}.legend .amber i{background:var(--amber)}.legend .blue i{background:var(--blue)}.steps-list{padding:0;list-style:none;counter-reset:s}.steps-list li{padding:13px 0;border-bottom:1px solid var(--edge);font-size:14px;counter-increment:s}.steps-list li:before{content:'0' counter(s);font:12px ui-monospace,monospace;color:var(--mint);margin-right:12px}.phase-title{font-size:28px;margin:14px 0 8px}.phase-ticker{height:4px;border-radius:4px;background:#263f49;overflow:hidden;margin:15px 0}.phase-ticker i{display:block;height:100%;background:var(--mint);width:0}.question-count{font:12px ui-monospace,monospace;color:var(--muted)}.answer{width:100%;text-align:left;margin:6px 0}.feedback{background:#203f35;border-left:3px solid var(--mint);padding:13px;font-size:14px;margin:13px 0}.feedback.bad{background:#422f28;border-color:var(--amber)}.score{font:56px ui-monospace,monospace;color:var(--mint)}.quiz-actions{display:flex;gap:8px;margin-top:16px}.quiz-actions button{flex:1}.principle{border-top:1px solid var(--edge);margin-top:32px;padding:25px 0;display:flex;align-items:center;justify-content:space-between;gap:24px}.principle h2{margin:0;font-size:23px}.principle ol{display:flex;list-style:none;padding:0;gap:25px;margin:0}.principle li{display:flex;gap:11px;align-items:center;font-size:14px}.principle b{font:24px ui-monospace,monospace;color:var(--mint)}.principle small{display:block;color:var(--muted);font-size:12px}.amber{color:var(--amber)!important}.blue{color:var(--blue)!important}.source{border-top:1px solid var(--edge);padding:20px 0;color:var(--muted);font-size:14px}.source summary{cursor:pointer;color:#c0d4dc}.source p{max-width:1050px;margin-top:14px}.source-links{display:flex;gap:22px;flex-wrap:wrap}footer{border-top:1px solid var(--edge);max-width:1600px;margin:auto;padding:20px 36px;display:flex;justify-content:space-between;gap:20px;color:#7995a2;font-size:12px}.hidden{display:none!important}@media(min-width:1400px){#canvasHost{height:535px}}@media(max-width:1100px){.workbench{grid-template-columns:minmax(0,1fr) 325px}main{padding:25px 22px}.hint{display:none}.principle{display:block}.principle ol{margin-top:20px;justify-content:space-between;gap:12px}.brand span{display:none}}@media(max-width:800px){header{height:64px;padding:0 18px}.brand{font-size:19px}.back{font-size:12px}main{padding:22px 14px}.intro{margin-bottom:20px}.intro h1{font-size:27px}.intro p:not(.eyebrow){font-size:14px}.intro-note{display:none}.workbench{grid-template-columns:1fr;gap:16px}.viewer-top{padding:12px}.model-badge{font-size:11px}#canvasHost{height:390px}.viewer-bottom{padding:8px 12px 12px}.explode-control{padding:13px 17px}.toggles{gap:15px}.learning{min-height:0}.parts{grid-template-columns:1fr 1fr 1fr}.principle ol{display:grid;grid-template-columns:1fr 1fr;gap:20px}.principle{margin-top:24px}.source-links{gap:12px}footer{padding:16px;display:block}footer span{display:block}.part-label{font-size:11px;padding:4px 6px;min-height:29px}.eyebrow{font-size:11px}.mode-tabs button{font-size:14px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.label-lines{position:absolute;width:100%;height:100%;inset:0;pointer-events:none}.label-lines line{stroke:#72979f;stroke-width:1;opacity:.45}.small{font-size:14px;color:var(--muted)}

.environment{border-top:1px solid #28434d;padding:24px;background:#0a1b25}.env-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.env-heading h2{margin:0 0 18px;font-size:21px}.env-heading button{color:#6ee5c6;border:1px solid #3b796d;padding:10px;border-radius:8px;background:#15312f}.env-inputs{display:grid;grid-template-columns:1fr 1fr;gap:22px 28px}.env-inputs label{font-size:14px;color:#b8ced4}.env-inputs output{float:right;color:#fff;font-variant-numeric:tabular-nums}.env-inputs input{display:block;width:100%;accent-color:#6ce4c6;margin-top:12px}.env-options{display:flex;flex-wrap:wrap;gap:16px;margin:20px 0;font-size:14px;align-items:center}.env-options select{background:#152d38;color:#d8e9ee;padding:6px;border:1px solid #33505d;border-radius:6px}.pressure-readouts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.pressure-readouts>div{background:#132a35;border:1px solid #294652;border-radius:9px;padding:12px}.pressure-readouts small{display:block;font-size:12px;color:#a9c1cb}.pressure-readouts strong{display:block;font-size:21px;margin:7px 0;font-variant-numeric:tabular-nums}.pressure-readouts span{font-size:13px;color:#73dac5}.thermal-note{font-size:14px;line-height:1.7;color:#c7d9df}.environment details{font-size:14px;line-height:1.8;color:#a7bfc8}.environment summary{cursor:pointer;color:#d3e5eb}.env-warning{color:#f1bf79!important}.density-key{position:absolute;left:18px;bottom:18px;font-size:12px;pointer-events:none;color:#a8c5d0;background:#091923dd;padding:8px 10px;border-radius:6px}.density-key b{color:#79e2cd}@media(max-width:600px){.environment{padding:18px}.env-heading{align-items:flex-start}.env-heading button{font-size:13px}.pressure-readouts strong{font-size:17px}.pressure-readouts>div{padding:9px}.env-inputs{gap:20px 15px}.env-inputs output{float:none;display:block;margin-top:4px}}