:root{color-scheme:light;--ink:#17231f;--muted:#52645c;--line:#d9e2dc;--accent:#28664d;--wash:#f4f8f5;--error:#9e2c23}*{box-sizing:border-box}body{margin:0;background:#fff;color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}header{display:flex;justify-content:space-between;gap:20px;padding:18px max(22px,calc((100vw - 1000px)/2));border-bottom:1px solid var(--line);font-size:14px}a{color:var(--accent);text-underline-offset:3px}header a:first-child{font-weight:750;letter-spacing:.05em;color:var(--ink);text-decoration:none}.reading{max-width:900px;margin:40px auto;padding:0 22px 50px}h1{font-size:clamp(2rem,5vw,3rem);line-height:1.12;letter-spacing:-.035em;margin:0 0 18px}h2{font-size:1.55rem;line-height:1.25;margin:38px 0 10px}h3{font-size:1.12rem;margin:20px 0 4px}.answer{font-size:1.19rem;line-height:1.55;padding:18px 20px;margin:0 0 26px;background:var(--wash);border-left:4px solid var(--accent);border-radius:0 8px 8px 0}.table-wrap{overflow-x:auto;margin:16px 0}table{width:100%;border-collapse:collapse;font-size:.95rem}caption{text-align:left;color:var(--muted);font-weight:650;padding:0 0 8px}th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}thead th{background:var(--wash)}.calculator{margin:30px 0;padding:20px;border:1px solid var(--line);border-radius:12px;background:#fbfdfb}.calculator form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.calculator label{display:grid;gap:5px;font-size:.9rem;font-weight:600}.calculator input{min-width:0;width:100%;padding:10px;border:1px solid #aab9af;border-radius:7px;font:inherit}.calculator button{grid-column:1/-1;justify-self:start;padding:11px 17px;border:0;border-radius:7px;background:var(--accent);color:white;font:inherit;font-weight:700;cursor:pointer}.note,.answer+section p,.error{color:var(--muted)}.error{color:var(--error);font-weight:650}code{overflow-wrap:anywhere;background:var(--wash);padding:2px 4px;border-radius:4px}footer{border-top:1px solid var(--line);padding:20px;text-align:center;color:var(--muted);font-size:.85rem}@media(max-width:640px){body{font-size:16px}header{padding:14px 16px}.reading{margin:26px auto;padding:0 16px 38px}.calculator{padding:16px}.calculator form{grid-template-columns:1fr}th,td{padding:8px;font-size:.87rem}.answer{padding:15px}}