:root{color-scheme:light;--ink:#24333b;--muted:#617078;--teal:#006f7e;--line:#d8e4e4;--soft:#f2f7f7;--draw-0:#2563a4;--draw-1:#bd4b25;--draw-2:#008376;--draw-3:#9252a3;--draw-4:#9c7411}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#f9fbfb;font:16px/1.6 Georgia,"Times New Roman",serif}main{padding:22px;max-width:1100px;margin:auto}h2,h3,.eyebrow,.controls,.legend,.plot-caption,.metrics,.status,.caveat{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}p{margin:0 0 14px}h2{font-size:21px;line-height:1.3;letter-spacing:-.02em;margin:0 0 12px}h3{font-size:13px;font-weight:600;line-height:1.5;margin:0 0 10px}.eyebrow{font-size:11px;letter-spacing:.075em;text-transform:uppercase;color:var(--teal);margin:0 0 8px}.intro{max-width:820px}.math{white-space:nowrap}.formula{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:20px 50px;font-size:19px;margin:20px 0 24px}.fraction{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.35}.fraction>span:first-child{padding:0 6px 5px;border-bottom:1px solid var(--ink)}.fraction>span:last-child{padding:4px 6px 0}.formula sub,.formula sup{font-size:.7em}.population-formula{color:#111}
.controls{display:grid;grid-template-columns:1fr 1fr auto;align-items:center;gap:20px;background:var(--soft);border-radius:5px;padding:16px;margin:18px 0}.controls label{display:grid;grid-template-columns:1fr auto;gap:6px 8px;font-size:13px;line-height:1.5;min-width:0}output{font-variant-numeric:tabular-nums}.controls output{font-weight:650;color:var(--teal)}input[type=range]{grid-column:1/-1;width:100%;margin:7px 0;accent-color:var(--teal)}.control-help{grid-column:1/-1;font-size:11px;color:var(--muted)}button{font:13px/1.4 system-ui,sans-serif;color:var(--teal);background:#fff;border:1px solid #8ba9ac;border-radius:4px;padding:10px 12px;cursor:pointer}button:hover{background:#e8f0f0}button:focus-visible,input:focus-visible{outline:3px solid #dc9d4e;outline-offset:3px}.legend{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;font-size:12px;margin:15px 0}.legend span:before{content:"";display:inline-block;width:20px;height:2px;background:var(--curve,#111);vertical-align:middle;margin-right:6px}.draw-0{--curve:var(--draw-0)}.draw-1{--curve:var(--draw-1)}.draw-2{--curve:var(--draw-2)}.draw-3{--curve:var(--draw-3)}.draw-4{--curve:var(--draw-4)}
.plot{background:#fff;border:1px solid var(--line);border-radius:5px;padding:13px 12px 10px;margin-top:12px;min-width:0}.plot h3{margin:0 8px}.plot canvas{display:block;width:100%;height:300px}.error-panel canvas{height:200px}.plot-caption{font-size:11px;color:var(--muted);line-height:1.5;margin:0 8px}.metrics{margin:20px 0 0}.norms{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:10px 0 12px}.norms p{border-top:3px solid var(--curve);background:#fff;padding:8px 10px;margin:0;line-height:1.5}.norms span{display:block;font-size:11px;color:var(--muted)}.norms output{display:block;font-size:18px;font-weight:550;color:var(--curve)}.caveat{font-size:11px;line-height:1.65;color:var(--muted);margin-bottom:0}.status{font-size:12px;line-height:1.7;border-top:1px solid var(--line);margin:16px 0 10px;padding-top:12px;font-variant-numeric:tabular-nums;min-height:34px}noscript{display:block;background:#fff4db;padding:15px}
@media(max-width:650px){main{padding:16px 12px}.controls{grid-template-columns:1fr 1fr;gap:14px;padding:12px}.controls button{grid-column:1/-1;justify-self:start}.control-help{min-height:33px}h2{font-size:19px}.formula{font-size:17px;gap:12px 30px}.plot{padding:12px 4px 8px}.plot canvas{height:280px}.error-panel canvas{height:200px}.norms{gap:6px}.norms p{padding:6px}.norms output{font-size:15px}.legend{gap:6px 12px}.legend span:before{width:15px}}
@media(max-width:370px){.controls{grid-template-columns:1fr}.control-help{min-height:0}.norms{grid-template-columns:repeat(3,1fr)}.formula{gap:16px}.plot-caption{margin:0 6px}}
@media print{.controls{display:none}main{padding:0}.plot,.metrics{break-inside:avoid}}