:root{--ink:#14213d;--muted:#51607a;--bg:#f7f9fc;--card:#ffffff;--brand:#0b6bcb;--brand2:#0a4f99;--accent:#f97316;--line:#dfe6f0}
*{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)}
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:1040px;margin:0 auto;padding:0 20px}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:62px;flex-wrap:wrap}
.brand{font-weight:800;font-size:20px;color:var(--ink);text-decoration:none}.brand span{color:var(--brand)}
.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:12px 22px;border-radius:8px;font-weight:700;text-decoration:none;border:0;cursor:pointer;font-size:16px}
.btn:hover{background:#e8620a}.btn.alt{background:var(--brand)}.btn.alt:hover{background:var(--brand2)}
.hero{padding:56px 0 30px}.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.15;margin:0 0 14px}.hero p.lead{font-size:20px;color:var(--muted);max-width:760px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;margin:20px 0}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid .card{margin:0}.grid h3{margin-top:0}
label{display:block;font-weight:600;font-size:14px;margin:12px 0 4px}
input[type=number]{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:16px}
.cols{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.out{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:6px}
.stat{background:#eef4fc;border-radius:10px;padding:12px 14px}.stat b{display:block;font-size:22px}.stat small{color:var(--muted)}
.stat.good b{color:#0a7a3d}.stat.bad b{color:#b42318}
.note{font-size:14px;color:var(--muted)}
article h1{font-size:clamp(28px,4.4vw,40px);line-height:1.2;margin:34px 0 10px}article h2{margin-top:34px;font-size:26px}
article p,article li{max-width:760px}
.callout{background:#fff7ed;border:1px solid #fed7aa;border-radius:10px;padding:16px 18px;margin:24px 0}
table{border-collapse:collapse;width:100%;max-width:760px;margin:16px 0}th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;font-size:15px}th{background:#eef4fc}
footer.site{background:#0f1c36;color:#c8d3e6;margin-top:50px;padding:34px 0;font-size:15px}footer.site a{color:#fff}
.crumbs{font-size:14px;color:var(--muted);margin-top:22px}
@media(max-width:560px){.out{grid-template-columns:1fr}.nav a.link{margin-left:0;margin-right:14px}}