:root{--bg:#f7faf9;--fg:#14211f;--muted:#4b5e5a;--card:#fff;--line:#d5e2df;--accent:#0b6e63;--accent-2:#0a5a51;--accent-soft:#e3f2ef;--warn:#7a4b00;--warn-bg:#fff4dc;--radius:12px;--max:46rem;color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--bg:#0f1716;--fg:#e6efed;--muted:#a6b8b4;--card:#16211f;--line:#2a3b38;--accent:#4fd1bd;--accent-2:#7fe0d0;--accent-soft:#18302c;--warn:#ffd48a;--warn-bg:#2d2412}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:1rem/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--accent)}a:hover{color:var(--accent-2)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:#fff;padding:.5rem 1rem;z-index:10}.skip:focus{left:.5rem;top:.5rem}
.wrap{max-width:var(--max);margin:0 auto;padding:0 1rem}
header.site{border-bottom:1px solid var(--line);background:var(--card)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1rem;padding-top:.6rem;padding-bottom:.6rem}
.brand{font-weight:800;font-size:1.2rem;text-decoration:none;color:var(--fg);letter-spacing:-.01em}.brand span{color:var(--accent)}
nav.main{display:flex;gap:1rem;margin-right:auto}nav.main a{text-decoration:none;color:var(--muted);font-weight:600}nav.main a[aria-current=page]{color:var(--fg)}
.units{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.units button{font:inherit;font-size:.85rem;border:0;background:transparent;color:var(--muted);padding:.3rem .75rem;cursor:pointer;min-height:2.25rem}
.units button[aria-pressed=true]{background:var(--accent);color:#fff}
@media (prefers-color-scheme:dark){.units button[aria-pressed=true]{color:#0f1716}}
main{padding:1.5rem 0 3rem}
h1{font-size:clamp(1.6rem,5vw,2.2rem);line-height:1.2;margin:.25rem 0 .5rem;letter-spacing:-.02em}
h2{font-size:1.3rem;margin:2rem 0 .5rem}h3{font-size:1.05rem;margin:1.25rem 0 .25rem}
.lede{font-size:1.1rem;color:var(--muted);margin-top:0}
.crumbs{font-size:.85rem;color:var(--muted)}.crumbs a{color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1rem}
.tool{margin:1.25rem 0}
.tool fieldset{border:0;padding:0;margin:0 0 1rem}
.tool legend{font-weight:700;margin-bottom:.5rem}
.grid{display:grid;gap:.75rem;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr))}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.2rem}
.field .hint{display:block;font-weight:400;color:var(--muted);font-size:.8rem}
.inputwrap{display:flex;align-items:stretch;border:1px solid var(--line);border-radius:8px;background:var(--bg);overflow:hidden}
.inputwrap:focus-within{outline:3px solid var(--accent);outline-offset:1px}
.inputwrap input,.inputwrap select,.field select{font:inherit;font-size:1rem;border:0;background:transparent;color:var(--fg);padding:.55rem .6rem;width:100%;min-width:0;min-height:2.75rem}
.inputwrap input:focus,.inputwrap select:focus{outline:none}
.field>select{border:1px solid var(--line);border-radius:8px;background:var(--bg)}
.unit{display:flex;align-items:center;padding:0 .6rem;color:var(--muted);font-size:.85rem;background:var(--accent-soft);white-space:nowrap}
.tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1rem}
.tabs button{font:inherit;border:1px solid var(--line);background:var(--bg);color:var(--fg);border-radius:999px;padding:.35rem .9rem;cursor:pointer;min-height:2.5rem}
.tabs button[aria-selected=true]{background:var(--accent);border-color:var(--accent);color:#fff}
@media (prefers-color-scheme:dark){.tabs button[aria-selected=true]{color:#0f1716}}
.results{background:var(--accent-soft);border-radius:10px;padding:.85rem 1rem;margin-top:.5rem}
.results dl{display:grid;grid-template-columns:auto 1fr;gap:.25rem 1rem;margin:0}
.results dt{color:var(--muted)}.results dd{margin:0;font-weight:700;font-variant-numeric:tabular-nums}
.results .big{font-size:1.5rem}
.note{background:var(--warn-bg);color:var(--warn);border-radius:10px;padding:.6rem .9rem;font-size:.9rem}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:.6rem .8rem;overflow-x:auto;white-space:pre;font-size:.9rem}
table{border-collapse:collapse;width:100%;font-size:.92rem;font-variant-numeric:tabular-nums}
th,td{border-bottom:1px solid var(--line);padding:.4rem .5rem;text-align:left;vertical-align:top}
.tablewrap{overflow-x:auto}
.toolgrid{display:grid;gap:.75rem;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));padding:0;list-style:none}
.toolgrid a{display:block;height:100%;text-decoration:none;color:inherit}
.toolgrid a:hover .card{border-color:var(--accent)}
.toolgrid h3{margin:0 0 .25rem;color:var(--accent)}.toolgrid p{margin:0;color:var(--muted);font-size:.92rem}
.gear{border:1px dashed var(--line);border-radius:var(--radius);padding:1rem;margin:2rem 0}
.gear h2{margin-top:0;font-size:1.1rem}.gear ul{margin:.25rem 0 .5rem;padding-left:1.2rem}
.small{font-size:.85rem;color:var(--muted)}
ol.refs li{margin-bottom:.4rem;font-size:.92rem}
footer.site{border-top:1px solid var(--line);padding:1.5rem 0;font-size:.9rem;color:var(--muted)}
footer.site nav{display:flex;flex-wrap:wrap;gap:.5rem 1rem;margin-bottom:.5rem}footer.site a{color:var(--muted)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}