:root{--ink:#1e2a1f;--muted:#54634f;--bg:#f6f9f3;--card:#fff;--brand:#15803d;--brand2:#166534;--accent:#c2410c;--line:#d8e5d1;--tint:#e9f3e3}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
h1,h2,h3{font-family:system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif}
a{color:var(--brand)}a:hover{color:var(--brand2)}
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:60px;flex-wrap:wrap}
.brand{font-family:system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;font-weight:700;font-size:21px;color:var(--ink);text-decoration:none}.brand span{color:var(--accent)}
.nav a.link{margin-left:18px;text-decoration:none;color:var(--muted);font-size:15px}
.btn{display:inline-block;background:var(--accent);color:#fff!important;padding:11px 20px;border-radius:8px;font-weight:700;text-decoration:none;border:0;cursor:pointer;font-size:16px}
.btn:hover{filter:brightness(.9)}
.hero{padding:48px 0 16px}.hero h1{font-size:clamp(30px,5vw,44px);line-height:1.15;margin:0 0 12px}.hero p.lead{font-size:20px;color:var(--muted);max-width:740px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;margin:18px 0}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.grid .card{margin:0}.grid h3{margin-top:0;font-size:18px}
label{display:block;font-weight:600;font-size:14px;margin:12px 0 4px}
input[type=number],select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:16px;background:#fff}
.cols{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.out{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat{background:var(--tint);border-radius:10px;padding:12px 14px}.stat b{display:block;font-size:21px}.stat small{color:var(--muted)}
.q{display:flex;gap:10px;align-items:flex-start;padding:9px 0;border-bottom:1px solid var(--line);font-size:15.5px}.q input{margin-top:5px;width:18px;height:18px;flex:none}
.result{margin-top:14px;padding:14px;border-radius:8px;background:var(--tint)}
article h1{font-size:clamp(28px,4.4vw,40px);line-height:1.2;margin:32px 0 10px}article h2{margin-top:32px;font-size:25px}
article p,article li{max-width:740px}
.callout{background:var(--tint);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:8px;padding:16px 18px;margin:24px 0;font-size:16px}
table{border-collapse:collapse;width:100%;max-width:760px;margin:16px 0;display:block;overflow-x:auto}th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;font-size:15px;vertical-align:top}th{background:var(--tint)}
footer.site{background:#1e2a1f;color:#d3d8e0;margin-top:50px;padding:32px 0;font-size:15px}footer.site a{color:#fff}
.crumbs{font-size:14px;color:var(--muted);margin-top:22px}.note{font-size:14px;color:var(--muted)}
@media(max-width:560px){.out{grid-template-columns:1fr}.nav a.link{margin-left:0;margin-right:14px}}