:root{--ink:#273a3a;--green:#38685d;--paper:#f7f5ef;--line:#d8dfdc;font-family:system-ui,Arial,sans-serif;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--paper);line-height:1.75}.shell{width:min(1080px,calc(100% - 36px));margin-inline:auto}.head{display:flex;justify-content:space-between;align-items:center;min-height:72px;border-bottom:1px solid var(--line)}.brand{font-weight:800;text-decoration:none;color:inherit}nav{display:flex;gap:18px}nav a{color:inherit;text-decoration:none}.hero,.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;padding-block:58px}.hero h1{font-size:clamp(2.3rem,5vw,4.3rem);line-height:1.2;margin:.25em 0}.hero figure,.split figure{margin:0}.hero img,.split img{display:block;width:100%;aspect-ratio:1.55;object-fit:cover;border-radius:14px}.tag{font-weight:750;color:var(--green)}.button{display:inline-block;background:var(--green);color:white;padding:11px 18px;border-radius:5px;text-decoration:none;font-weight:750}.muted,figcaption{font-size:.9rem;color:#596763}.split{border-block-start:1px solid var(--line)}.split h2,.calc h2{font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.25}.reverse figure{order:2}.calc{background:#e9efeb;padding-block:52px}.formula{background:#fff;padding:14px;border-inline-start:4px solid #d49361}.wide{display:block;max-width:360px;margin-block:18px}.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}fieldset{background:white;border:1px solid #bac8c1;border-radius:12px;padding:18px}legend{font-weight:800}label{display:block;font-weight:650;margin-block:11px}input,textarea{display:block;width:100%;margin-block-start:5px;padding:10px;border:1px solid #afbeb7;border-radius:6px;background:white;color:var(--ink);font:inherit}input[type=number]{direction:ltr;text-align:right}input:focus-visible,textarea:focus-visible{outline:3px solid #dda574}output{display:block;margin-block-start:15px;font-size:1.15rem;font-weight:800;direction:ltr;text-align:right}.difference{font-weight:800}.foot{border-block-start:1px solid var(--line);padding-block:24px 40px}.skip{position:absolute;inset-inline-start:-9999px}.skip:focus{inset-inline-start:10px;top:10px;background:#fff;padding:8px}@media(max-width:760px){.shell{width:calc(100% - 28px)}.head{align-items:flex-start;flex-direction:column;padding-block:13px;gap:8px}nav{gap:14px;flex-wrap:wrap}.hero,.split{grid-template-columns:1fr;gap:22px;padding-block:38px}.reverse figure{order:0}.cards{grid-template-columns:1fr}.calc{padding-block:40px}}