:root{color-scheme:dark;--bg:#071725;--panel:#11283a;--line:#29495e;--text:#eef5f9;--muted:#adc3d1;--blue:#69d5ed;--gold:#f8ce81;--purple:#c6a7ff}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 80% 0,#12364b,transparent 50%),var(--bg);color:var(--text);font:16px/1.6 Inter,Segoe UI,Arial,sans-serif}a{color:var(--blue)}header{padding:20px 5vw;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}.brand{font-weight:800;letter-spacing:.12em;text-decoration:none;color:var(--text)}.brand small{display:block;font-size:10px;color:var(--muted)}header nav{display:flex;gap:20px;flex-wrap:wrap}main{max-width:1450px;margin:auto;padding:42px 4vw 70px}.hero{max-width:850px}.hero h1{font-size:clamp(30px,4vw,56px);line-height:1.12;letter-spacing:-.03em;margin:12px 0 20px}.hero p,.heading p{color:var(--muted)}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.17em;color:var(--blue)}.lab-nav{display:flex;gap:10px;flex-wrap:wrap;margin:32px 0}.lab-nav a{padding:12px 16px;border:1px solid var(--line);border-radius:10px;text-decoration:none}.lab-nav a[aria-current=page]{background:var(--blue);color:var(--bg);font-weight:750}.lab{scroll-margin-top:20px}.heading{margin:35px 0 22px}.heading h2{font-size:30px;line-height:1.2;margin:8px 0}.two-col{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.2fr);gap:18px;align-items:start}.panel{padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:16px;margin:0 0 18px;min-width:0}.panel h3{margin-top:0;font-size:18px}.panel p,.panel li{font-size:14px;color:var(--muted);overflow-wrap:break-word}.fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}label{font-size:12px;color:var(--muted);display:block}input,select,button{font:inherit;color:var(--text);background:#173146;border:1px solid var(--line);border-radius:8px;padding:10px;max-width:100%}input,select{display:block;width:100%;margin-top:5px;font-size:15px}button{cursor:pointer;margin-top:18px;font-size:14px;font-weight:650}button:hover{border-color:var(--blue)}:focus-visible{outline:3px solid var(--gold);outline-offset:4px}.check{display:flex;gap:8px;margin-top:18px;align-items:center}.check input{width:auto;margin:0}output{display:block;font-size:25px;font-weight:700;color:var(--blue);margin-top:20px}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.metric{padding:12px;background:#071d2b;border:1px solid var(--line);border-radius:10px;min-width:0}.metric small{display:block;color:var(--muted);font-size:10px}.metric strong{font-size:18px;overflow-wrap:anywhere}.error{color:#ffc4a0!important}.legend{font-size:12px;display:flex;gap:15px;flex-wrap:wrap}.blue{color:var(--blue)}.gold{color:var(--gold)}.purple{color:var(--purple)}svg{display:block;width:100%;height:auto;margin:20px 0}.axis{stroke:#537489}.grid{stroke:#29495e;stroke-width:.7}.tick{font-size:13px;fill:var(--muted)}.curve{fill:none;stroke-width:2.5}.curve-blue{stroke:var(--blue)}.curve-gold{stroke:var(--gold)}.curve-purple{stroke:var(--purple)}summary{cursor:pointer;font-weight:650}.challenge{padding:18px;border-left:3px solid var(--gold);background:#17314670;font-size:14px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:right;padding:9px;border-bottom:1px solid var(--line)}th:first-child,td:first-child{text-align:left}caption{text-align:left;color:var(--muted);padding:10px 0}.footer-actions{display:flex;gap:22px;align-items:center}footer{padding:20px 5vw;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.skip{position:absolute;top:-100px}.skip:focus{top:10px}[hidden]{display:none!important}@media(max-width:900px){.two-col{grid-template-columns:1fr}.hero{max-width:none}}@media(max-width:480px){main{padding:28px 16px}.panel{padding:16px}.fields{grid-template-columns:1fr}.metrics{grid-template-columns:1fr 1fr}.heading h2{font-size:25px}.lab-nav a{width:100%;font-size:14px}.metric strong{font-size:16px}}@media print{:root{color-scheme:light;--bg:white;--panel:white;--line:#bbb;--text:#111;--muted:#333;--blue:#07547a;--gold:#875100;--purple:#613582}body{background:white}header,.lab-nav,form,button,.footer-actions,footer{display:none!important}main{padding:0}.two-col{display:block}.panel,.metric{background:white;box-shadow:none}.heading{margin:12px 0}.curve{stroke-width:2}svg,.metrics{break-inside:avoid}.challenge{background:white}}

.export-actions{display:flex;gap:14px;align-items:end;flex-wrap:wrap}.export-actions label{max-width:290px}.export-actions button{margin:0}.study-export{margin-top:28px}@media print{.study-export{display:none!important}}

@media print{.export-panel{display:none!important}}