:root{--bg:#fbfbf9;--surface:#fff;--text:#1c1f1e;--muted:#5a6260;--line:#e2e5e3;--accent:#0f766e;--accent-text:#fff;--accent-soft:#e6f2f0;--code-bg:#f1f4f3;--radius:10px;--wrap:68rem;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--bg:#111413;--surface:#181c1b;--text:#e8ecea;--muted:#9ea8a5;--line:#2a302e;--accent:#2dd4bf;--accent-text:#08201d;--accent-soft:#15302c;--code-bg:#1f2523}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font:1.0625rem/1.65 system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}a{color:var(--accent);text-underline-offset:.15em}a:hover{text-decoration-thickness:2px}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}h1,h2,h3{letter-spacing:-.01em;line-height:1.2}h1{margin:0 0 1rem;font-size:clamp(2rem,5vw + .5rem,3.4rem)}h2{margin:0 0 1rem;font-size:clamp(1.5rem,2.5vw + .5rem,2.1rem)}h3{margin:0 0 .4rem;font-size:1.15rem}.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1rem}@media (width>=40rem){.wrap{padding:0 1.5rem}}.skip{position:absolute;left:-999px}.skip:focus{background:var(--surface);z-index:10;padding:.5rem 1rem;top:1rem;left:1rem}.suggest{background:var(--accent-soft);justify-content:center;align-items:center;gap:1rem;padding:.5rem 1rem;font-size:.95rem;display:flex}.suggest[hidden]{display:none}.suggest p{margin:0}.suggest button{color:var(--text);cursor:pointer;background:0 0;border:0;padding:.2rem .5rem;font-size:1.4rem;line-height:1}.site-header{border-bottom:1px solid var(--line)}.header-inner{justify-content:space-between;align-items:center;min-height:4rem;display:flex}.wordmark{color:var(--text);letter-spacing:-.02em;font-size:1.35rem;font-weight:800;text-decoration:none}.wordmark:first-letter{color:var(--accent)}.site-header nav a{color:var(--muted);font-size:.95rem;text-decoration:none}.site-header nav a:hover{color:var(--text)}section{padding:clamp(3rem,7vw,5.5rem) 0}section+section{border-top:1px solid var(--line)}.lead{color:var(--muted);max-width:42rem;font-size:clamp(1.1rem,1vw + .9rem,1.35rem)}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 .75rem;font-size:.85rem;font-weight:700}.prose{max-width:44rem}.hero{padding-top:clamp(3.5rem,10vw,7rem)}.hero .actions{flex-wrap:wrap;gap:.75rem;margin-top:2rem;display:flex}.button{border-radius:var(--radius);background:var(--accent);color:var(--accent-text);border:2px solid var(--accent);padding:.8rem 1.4rem;font-weight:650;text-decoration:none;display:inline-block}.button.secondary{color:var(--accent);background:0 0}.grid{grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:1rem;margin-top:2rem;display:grid}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem}.card p{color:var(--muted);margin:0}.formulas{gap:1rem;margin:2rem 0 1rem;display:grid}.formula{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.4rem}.formula h3{margin-bottom:.6rem}.formula code{white-space:pre-wrap;background:var(--code-bg);border-radius:6px;padding:.7rem .9rem;font:.95rem/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;display:block;overflow-x:auto}.formula p{color:var(--muted);margin:.6rem 0 0;font-size:.95rem}.checks{gap:.6rem;margin:1.5rem 0 0;padding:0;list-style:none;display:grid}.checks li{padding-left:1.8rem;position:relative}.checks li:before{content:"✓";color:var(--accent);font-weight:800;position:absolute;left:0}.notice{background:var(--accent-soft);border-radius:var(--radius);max-width:44rem;padding:1.4rem}.notice p:last-child{margin-bottom:0}details{border-bottom:1px solid var(--line);max-width:44rem;padding:1rem 0}details summary{cursor:pointer;font-weight:650}details p{color:var(--muted);margin:.6rem 0 0}.legal{padding-top:3rem}.legal h2{margin-top:2rem;font-size:1.3rem}.site-footer{border-top:1px solid var(--line);color:var(--muted);padding:2rem 0 2.5rem;font-size:.92rem}.footer-inner{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:.5rem 2rem;display:flex}.footer-inner p{margin:0}.footer-inner nav{flex-wrap:wrap;gap:.5rem 1.25rem;display:flex}.footer-inner a{color:var(--muted)}.version{font-variant-numeric:tabular-nums}