:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--ink:#e8eeeb;--muted:#a4b4c0;--lime:#c7e6a6;--border:#2c3e4b;--panel:#14232eea;color:var(--ink);background:#0c1721;font-family:Arial,Helvetica,sans-serif;font-size:15px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--lime)}button{cursor:pointer;color:inherit;border:1px solid var(--border);background:#223440;border-radius:7px;justify-content:center;align-items:center;gap:7px;padding:9px 12px;display:inline-flex}button:hover{background:#334a55}button:disabled{opacity:.4;cursor:default}button[aria-pressed=true]{color:var(--lime);background:#2c403a;border-color:#69846e}a{color:var(--lime);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,p{margin-top:0}p{color:#bdcbd2;line-height:1.62}h1{letter-spacing:-1.1px;margin:13px 0 17px;font-size:29px;line-height:1.16}h2{font-size:19px;line-height:1.35}h3{font-size:16px}small{color:var(--muted)}.header{border-bottom:1px solid var(--border);background:#101d27;justify-content:space-between;align-items:center;gap:20px;height:80px;padding:0 25px;display:flex}.brand{color:#eaf1ec;letter-spacing:-1px;align-items:center;gap:9px;font-size:25px;font-weight:800;display:flex}.brand svg,.brand>span>span{color:var(--lime)}.header nav{gap:8px;display:flex}.header nav button{background:0 0;border-color:#0000;font-size:13px}.course{letter-spacing:1.5px;color:#a7b5c0;align-items:center;gap:9px;font-size:11px;display:flex}.course i{background:#54616c;width:1px;height:14px;margin:0 5px}.live-dot{background:var(--lime);border-radius:50%;width:6px;height:6px;display:inline-block;box-shadow:0 0 10px #c7e6a63d}.study-layout{grid-template-columns:330px minmax(400px,1fr) 285px;min-height:calc(100dvh - 80px);display:grid}.guide{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;height:calc(100dvh - 80px);display:flex;position:sticky;top:0}.chapter{text-transform:uppercase;letter-spacing:1px;color:var(--muted);justify-content:space-between;gap:8px;padding:19px 22px 15px;font-size:10px;display:flex}.progress{background:#293b47;height:2px}.progress i{background:var(--lime);height:2px;display:block}.guide-body{flex:1;padding:27px 23px;overflow:auto}.eyebrow{letter-spacing:1.65px;color:#9fb4bb;font-size:10px;font-weight:700}.intro{color:#c3d0d8;font-size:16px;line-height:1.55}.tabs{border-bottom:1px solid var(--border);gap:8px;margin:24px 0;display:flex}.tabs button{text-transform:capitalize;color:var(--muted);background:0 0;border:0;border-radius:0;flex:1;padding:10px 2px}.tabs button[aria-pressed=true]{border-bottom:2px solid var(--lime);color:var(--lime)}.guide-body section p{font-size:14px}.equation{background:#20352e;border:1px solid #426052;border-radius:9px;margin:22px 0;padding:18px 14px}.equation span{letter-spacing:1.2px;color:#9eb5a7;font-size:9px;display:block}.equation strong{color:#d6edbe;margin:12px 0;font-family:Georgia,serif;font-size:18px;font-weight:400;line-height:1.6;display:block}.equation small{font-size:11px;line-height:1.6;display:block}.primary{background:var(--lime);color:#15231b;border:0;width:100%;margin-top:14px;font-weight:600}.primary:hover{background:#d5edbb}.correction{color:#e0ca9f;background:#302c24;border:1px solid #6b5f45;border-radius:7px;margin:18px 0;padding:12px;font-size:12px}.correction p{margin:12px 0 0}.correction summary,.limits summary{cursor:pointer}.guide-footnote{color:#82999f;border-top:1px solid var(--border);align-items:center;gap:12px;margin-top:30px;padding-top:22px;font-size:11px;line-height:1.6;display:flex}.lesson-nav{border-top:1px solid var(--border);justify-content:space-between;gap:8px;padding:13px 18px;display:flex}.lesson-nav button:last-child{background:0 0;border-color:#0000;flex:1}.lab{background:radial-gradient(at 50% 30%,#172c3d,#0c1721 70%);min-width:0;position:relative}.lab-heading{z-index:2;justify-content:space-between;align-items:center;padding:24px 25px 0;display:flex;position:relative}.lab-heading h2{letter-spacing:-.45px;margin:7px 0 0;font-size:20px}.lab-heading button{background:0 0;border-color:#0000}.scene{height:470px;min-height:350px;position:relative}.scene canvas{touch-action:none}.scene-badge{letter-spacing:1.3px;pointer-events:none;flex-wrap:wrap;align-items:center;gap:7px;max-width:240px;font-size:10px;display:flex;position:absolute;top:20px;left:23px}.scene-badge small{letter-spacing:0;color:#8097a6;flex-basis:100%;margin-top:3px;font-size:10px}.scene-tools{gap:5px;display:flex;position:absolute;bottom:15px;right:20px}.scene-tools button{background:#142734d9;padding:7px 9px;font-size:10px}.scene-label{color:#d5e2df;white-space:nowrap;background:#142632e8;border:1px solid #3e5661;border-radius:4px;padding:5px 8px;font-size:10px;display:inline-block}.scene-fallback{color:#a8bbc6;text-align:center;flex-direction:column;justify-content:center;align-items:center;height:100%;min-height:300px;padding:30px;font-size:13px;display:flex}.scene-fallback svg{max-width:100%}.playback{border-top:1px solid var(--border);color:var(--muted);align-items:center;gap:12px;margin:0 25px;padding:10px 0;font-size:10px;display:flex}.playback input{flex:1;min-width:20px}.playback button{background:0 0;border-color:#0000;padding:7px}.metrics{grid-template-columns:repeat(4,1fr);gap:15px;padding:13px 25px 22px;display:grid}.metrics strong{letter-spacing:-.6px;color:#e5efdf;white-space:nowrap;font-variant-numeric:tabular-nums;font-size:22px;display:block}.metrics span{color:#91a6b5;margin-top:6px;font-size:10px;line-height:1.5;display:block}.chart-grid{border-top:1px solid var(--border);grid-template-columns:1fr 1fr;gap:18px;padding:19px 24px;display:grid}.chart-grid>div{min-width:0}.chart-grid h3{letter-spacing:.2px;color:#d4dfdf;justify-content:space-between;gap:6px;font-size:11px;font-weight:500;display:flex}.chart-grid h3 span{color:#8198a6;font-size:9px}.plot{width:100%;min-height:105px;display:block;overflow:visible}.plot text{fill:#839cab;font-size:10px}.overlay-chart{position:relative}.overlay-chart>div{position:absolute;inset:0}.overlay-chart>div text,.overlay-chart>div line{visibility:hidden}.orbit-bands{height:4px;margin-right:14px;display:flex}.orbit-bands>div{flex:1;display:flex}.orbit-bands i{background:#bfa46c}.orbit-bands b{background:#9b7db4}.legend{border-radius:50%;width:5px;height:5px;margin:0 3px;display:inline-block}.green{background:var(--lime)}.cyan{background:#8dc8eb}.energy-bars{padding:7px 5px}.energy-bars label{color:#acbdc8;justify-content:space-between;margin-bottom:10px;font-size:11px;display:flex}.energy-bars i{border-radius:3px;min-width:2px;height:10px;margin-bottom:20px;display:block}.factor-grid{grid-template-columns:1fr 1fr;gap:13px;padding:5px;display:grid}.factor-grid>div{color:#9db0be;padding-bottom:10px;font-size:10px;position:relative}.factor-grid strong{float:right;color:#dcebd9;font-weight:500}.factor-grid i{background:var(--lime);height:3px;position:absolute;bottom:0;left:0}.controls{border-left:1px solid var(--border);background:var(--panel);height:calc(100dvh - 80px);padding:22px 20px;position:sticky;top:0;overflow:auto}.controls-head{color:#c0cfcf;align-items:center;gap:9px;margin-bottom:22px;display:flex}.controls-head h2{margin:0;font-size:13px;font-weight:500}.preset{color:var(--muted);margin-bottom:22px;font-size:11px;display:block}.preset select{color:#dde5e7;background:#1c2d39;border:1px solid #3d505c;border-radius:6px;width:100%;margin-top:8px;padding:10px 8px;font-size:12px;display:block}.control{margin:0 0 22px}.control label{justify-content:space-between;gap:5px;font-size:11px;line-height:1.6;display:flex}.control strong{color:var(--lime);white-space:nowrap;font-size:13px;font-weight:500}.control strong small{font-size:10px}.control>small{color:#8097a7;margin-top:7px;font-size:10px;line-height:1.5;display:block}.control input[type=range]{vertical-align:middle;width:calc(100% - 61px);margin:13px 7px 0 0}.exact{color:#c3d1dc;background:#142532;border:1px solid #364d5b;border-radius:4px;width:52px;padding:3px;font-size:10px}.exact::-webkit-inner-spin-button{display:none}input[type=range]{accent-color:var(--lime);cursor:pointer;height:3px}.toggle{align-items:flex-start;gap:9px;margin:20px 0;font-size:12px;line-height:1.5;display:flex}.toggle input{accent-color:var(--lime);margin-top:3px}.secondary{background:0 0;width:100%;margin:8px 0;font-size:11px}.text-button{color:#9ab1be;background:0 0;border:0;width:100%;font-size:11px}.control-note{color:#97acb9;margin:12px 0 20px;font-size:11px;line-height:1.6}.limits{border-top:1px solid var(--border);color:#91aab9;margin-top:25px;padding-top:18px;font-size:11px}.limits p{margin:15px 0 0;font-size:11px}.model-note{color:#7c94a4;border-top:1px solid var(--border);margin:0 25px;padding:15px 0;font-size:10px;line-height:1.65}.model-status{color:#b2d2b7;background:#172d24;border:1px solid #365a4b;border-radius:6px;margin:0 25px 15px;padding:10px 15px;font-size:11px}.warn{color:#edc089!important}.model-status.warn{background:#30291d;border-color:#6b5334}.answers{flex-direction:column;gap:12px;margin-top:22px;display:flex}.answers button{text-align:left;justify-content:flex-start;padding:12px;font-size:13px;line-height:1.5}.answers span{background:#334a56;border-radius:3px;padding:4px;font-size:10px}.answers .correct{background:#27402b;border-color:#91b685}.answers .incorrect{border-color:#aa7972}.feedback{color:var(--lime);padding:17px 0;font-size:13px}.feedback p{margin-top:12px}.status{border-left:2px solid var(--lime);margin-top:16px;padding:8px 10px;font-size:12px}.sizing{border-top:1px solid var(--border);margin:0 25px 25px;padding-top:22px}.sizing p{font-size:12px}.section-head{justify-content:space-between;align-items:center;display:flex}.section-head button{font-size:10px}.section-head h3{margin:0}.table-scroll{overflow:auto}table{border-collapse:collapse;color:#bdcdd6;width:100%;margin:18px 0;font-size:11px}th{text-align:left;color:#dfe8df;background:#20323e;font-size:10px;font-weight:500}th,td{border-bottom:1px solid var(--border);padding:10px 8px}td:not(:first-child){font-variant-numeric:tabular-nums;white-space:nowrap}td:last-child{text-align:right}.modal{color:var(--ink);background:#14242f;border:1px solid #476070;border-radius:13px;width:min(780px,92vw);max-height:86dvh;padding:30px 35px;box-shadow:0 40px 130px #0008}.modal::backdrop{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#071018cf}.modal>header{justify-content:space-between;align-items:flex-start;gap:25px;margin-bottom:26px;display:flex}.modal header h2{margin:8px 0 0;font-size:24px}.modal header button{background:0 0;border:0}.modal p{font-size:14px}.modal h3{color:#d4e2dc;margin-top:25px}.modal small{font-size:12px}.search{color:#e9f2ed;background:#1d3342;border:1px solid #3e5768;border-radius:7px;width:100%;margin-bottom:15px;padding:13px 15px}.map-row{border:0;border-bottom:1px solid var(--border);text-align:left;background:0 0;border-radius:0;justify-content:flex-start;gap:15px;width:100%;padding:15px 8px;display:flex}.map-row>span{color:#88a195;width:25px;font-size:11px}.map-row div{flex:1}.map-row strong{font-size:14px;font-weight:500;display:block}.map-row small{margin-top:6px;font-size:10px;display:block}.glossary article{border-bottom:1px solid var(--border);gap:25px;padding:18px 0;display:flex}.glossary article>strong{width:85px;color:var(--lime);flex-shrink:0}.glossary article h3{margin:0 0 8px}.glossary article p{margin:0}.skip{background:var(--lime);color:#14251b;z-index:20;padding:12px;position:fixed;top:-100px;left:20px}.skip:focus{top:10px}.focused .guide,.focused .controls{display:none}.focused .study-layout{grid-template-columns:1fr}.focused .scene{height:65dvh}.focused .chart-grid,.focused .metrics{max-width:1100px;margin:auto}.focused .lab-heading{padding-left:35px}.focused .model-note{max-width:1050px;margin:auto}@media (min-width:1600px){.study-layout{grid-template-columns:360px minmax(400px,1fr) 310px}.scene{height:55dvh}.guide-body section p{font-size:15px}.control label{font-size:12px}.control>small{font-size:11px}}@media (max-width:1200px){.study-layout{grid-template-columns:285px minmax(320px,1fr) 240px}.course{display:none}.guide-body{padding:24px 18px}.controls{padding:22px 15px}.scene{height:390px}h1{font-size:25px}.chart-grid{grid-template-columns:1fr;gap:12px;padding:16px 20px}.plot{max-height:145px}.metrics{grid-template-columns:1fr 1fr;gap:15px}.metrics strong{font-size:23px}.scene-label{font-size:9px}.header nav button{font-size:12px}}@media (max-width:950px){.study-layout{grid-template-columns:300px 1fr}.controls{border-top:1px solid var(--border);grid-column:2;height:auto;position:static}.guide{grid-row:1/3;height:calc(100dvh - 80px)}.lab{grid-column:2}.chart-grid{grid-template-columns:1fr}.scene{height:400px}.controls .control{vertical-align:top;width:calc(50% - 12px);margin-right:10px;display:inline-block}.controls-head{margin-bottom:15px}.control-note{max-width:500px}.header{padding:0 18px}.header nav button span{display:none}.guide h1{font-size:26px}}@media (max-width:650px){.header{gap:7px;height:65px;padding:0 13px}.brand{font-size:21px}.brand svg{width:20px}.header nav{gap:2px}.header nav button{padding:8px 5px;font-size:10px}.study-layout{flex-direction:column;display:flex}.guide{border:0;order:1;height:auto;position:static}.guide-body{padding:23px 20px;overflow:visible}.guide-body h1{max-width:400px;font-size:29px}.guide-body section p{font-size:15px}.guide-footnote{display:none}.guide .chapter{padding:15px 20px}.lesson-nav{padding:10px 20px}.lab{order:2}.controls{border-left:0;order:3;padding:25px 20px}.scene{height:380px}.scene-label{font-size:9px}.lab-heading{padding:24px 20px 0}.lab-heading h2{font-size:20px}.chart-grid{grid-template-columns:1fr}.metrics{grid-template-columns:repeat(2,1fr);padding:15px 20px}.metrics strong{font-size:25px}.metrics span{font-size:11px}.controls .control{width:100%;margin-right:0}.control label{font-size:13px}.control>small{font-size:12px}.control input[type=range]{width:calc(100% - 79px);height:5px}.exact{width:68px;padding:5px;font-size:12px}.preset{font-size:13px}.preset select{font-size:14px}.control strong{font-size:15px}.controls-head h2{font-size:17px}.modal{padding:25px 20px}.modal header h2{font-size:22px}.sizing{margin:0 20px 22px}.sizing table{font-size:11px}.focused .guide,.focused .controls{display:none}.focused .scene{height:65dvh}.focused .lab{width:100%}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}.array-options{margin-bottom:24px}.array-options .eyebrow{margin-bottom:10px;display:block}.array-options button{margin:0 5px 7px 0;font-size:11px}.scene-label{white-space:normal;text-align:center;max-width:220px;font-size:11px;line-height:1.35}.scene-tools,.scene-badge{z-index:4}.model-status{color:#adbfcb;background:#192c38;border-color:#354c5b}.model-status.warn{color:#f0cd9b!important}.plot text{font-size:14px}@media (max-width:650px){.plot text{font-size:18px}.plot{min-height:120px}.orbit-bands{margin-left:54px!important}}
