:root{--g:#2f6b3a;--g2:#e9f2ea;--ink:#1d2421;--mut:#5b6660;--line:#dde3df;--bg:#f7f8f6;--card:#fff;--acc:#b8860b;--r:12px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
[hidden]{display:none!important}
a{color:var(--g)}a:hover{color:#1f4a28}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.2rem;text-decoration:none;color:var(--ink)}.logo span span{color:var(--g)}
.top nav a{margin-left:18px;text-decoration:none;color:var(--mut);font-weight:500}.top nav a:hover{color:var(--g)}
h1{font-size:clamp(1.7rem,4vw,2.4rem);line-height:1.2;margin:.4em 0 .3em}
h2{font-size:1.35rem;margin:1.6em 0 .5em;line-height:1.3}
.lede{font-size:1.08rem;color:var(--mut);max-width:760px}
.crumbs{font-size:.88rem;color:var(--mut);margin-top:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:0 1px 2px rgba(0,0,0,.04)}
form.calc{display:grid;grid-template-columns:1.15fr 1fr;gap:0;margin:22px 0;overflow:hidden}
.inputs{padding:20px}.out{padding:20px;background:var(--g2);border-left:1px solid var(--line)}
.out h2{margin:0 0 10px;font-size:1.15rem}
.f{display:flex;flex-direction:column;margin-bottom:12px;min-width:0}
.f>span:first-child{font-size:.9rem;font-weight:600;margin-bottom:4px}
.f small{color:var(--mut);font-size:.8rem;margin-top:3px}
.in{display:flex;align-items:stretch;border:1px solid #c9d2cc;border-radius:8px;background:#fff;overflow:hidden}
.in:focus-within,select:focus{outline:2px solid var(--g);outline-offset:0}
.in input{flex:1;min-width:0;border:0;padding:10px 12px;font-size:1rem;background:transparent;outline:none}
.in em{font-style:normal;color:var(--mut);background:#f1f4f2;padding:10px 10px;font-size:.9rem;white-space:nowrap}
select{width:100%;padding:10px 12px;font-size:1rem;border:1px solid #c9d2cc;border-radius:8px;background:#fff;color:var(--ink)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.units{border:0;padding:0;margin:0 0 14px;display:flex;gap:16px;flex-wrap:wrap}.units legend{font-weight:600;font-size:.9rem;margin-bottom:4px;padding:0}
.units label{font-size:.95rem;display:flex;gap:6px;align-items:center}
.results .r{display:flex;justify-content:space-between;gap:10px;padding:7px 0;border-bottom:1px dashed #c8d8cb;font-size:.95rem}
.results .r b{font-variant-numeric:tabular-nums;text-align:right}
.results .big b{font-size:1.25rem;color:var(--g)}
.err{color:#a33}.small{font-size:.82rem;color:var(--mut)}
.content{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:8px 26px 22px;margin:24px 0}
.content.page{margin-top:24px}
.content ul,.content ol{padding-left:1.3em}.content li{margin:.3em 0}
.formula{background:#f6f3e8;border-left:4px solid var(--acc);padding:9px 14px;border-radius:6px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92rem;overflow-x:auto}
.faq details{border:1px solid var(--line);border-radius:8px;padding:10px 14px;margin:8px 0;background:#fcfdfc}
.faq summary{cursor:pointer;font-weight:600}.faq p{margin:.6em 0 .2em}
.related ul,.grid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.related li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;display:flex;flex-direction:column}
.related li span{color:var(--mut);font-size:.88rem}
.tile-link{display:flex;flex-direction:column;padding:16px;text-decoration:none;color:var(--ink);height:100%;transition:border-color .15s,transform .15s}
.tile-link:hover{border-color:var(--g);transform:translateY(-1px)}.tile-link b{color:var(--g);font-size:1.05rem}.tile-link span{color:var(--mut);font-size:.9rem}
.hero{padding:34px 0 8px}.hero h1{font-size:clamp(2rem,5vw,2.9rem)}
.placeholder{color:var(--mut)}
.foot{border-top:1px solid var(--line);background:#fff;margin-top:40px;padding:18px 0;color:var(--mut);font-size:.92rem}
@media (max-width:760px){form.calc{grid-template-columns:1fr}.out{border-left:0;border-top:1px solid var(--line)}.content{padding:4px 16px 16px}.top nav a{margin-left:12px;font-size:.92rem}}
@media (max-width:420px){.row{grid-template-columns:1fr}.top nav a:first-child{display:none}}