:root{
  --brand:#173a5e;--brand2:#2e6da4;--accent:#e0a339;--ink:#182430;--muted:#5c6b7a;--bg:#f4f7fa;--card:#fff;
  --line:#dde4ec;--green:#1e7d43;--amber:#b8781a;--red:#b3392e;--radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
a{color:var(--brand2)}
.wrap{max-width:920px;margin:0 auto;padding:0 20px}
header.site{background:#0e2338;color:#fff;padding:14px 0}
header.site .wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.logo{font-weight:800;font-size:19px;color:#fff;text-decoration:none}
.logo .tick{color:#7fb8e0}
nav.top{margin-left:auto;display:flex;gap:18px;font-size:14px;flex-wrap:wrap}
nav.top a{color:#b9d6ec;text-decoration:none}
.hero{padding:34px 22px 6px}
h1{font-size:28px;margin:0 0 8px;color:#0e2338}
.sub{color:var(--muted);max-width:720px;font-size:16px}
.badge-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.badge{font-size:12.5px;background:#e6eef7;color:var(--brand);padding:3px 10px;border-radius:20px}

.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
@media(max-width:760px){.grid{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 1px 4px rgba(14,40,60,.06)}
.card h2{margin:0 0 14px;font-size:18px;color:#0e2338}
label{display:block;font-size:13.5px;font-weight:700;color:var(--muted);margin:14px 0 6px}
label:first-of-type{margin-top:0}
input[type=number],input[type=text],select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:15px;background:#fbfcfe;color:var(--ink)}
input:focus,select:focus{outline:2px solid var(--brand2);outline-offset:1px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
button.primary{width:100%;margin-top:16px;padding:13px 14px;border:0;border-radius:9px;background:var(--brand);color:#fff;font:inherit;font-weight:800;font-size:15px;cursor:pointer}
button.primary:hover{background:var(--brand2)}
button.ghost{padding:10px 14px;border:1px solid var(--line);background:#fff;border-radius:9px;font:inherit;font-weight:700;font-size:14px;color:var(--brand);cursor:pointer}

.big-answer{text-align:center;padding:10px 0 6px}
.big-answer .round{font-size:34px;font-weight:800;color:var(--brand)}
.big-answer .round span{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-top:2px}
.big-answer .sub{font-size:13px;color:var(--muted);margin-top:6px}
.stat-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.stat{flex:1;min-width:100px;background:#f4f8fc;border:1px solid var(--line);border-radius:9px;padding:10px;text-align:center}
.stat b{display:block;font-size:18px;color:var(--brand)}
.stat span{font-size:11.5px;color:var(--muted)}
.copybox{display:flex;gap:8px;margin-top:10px}
.copybox input{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px}
.copybox button{white-space:nowrap}
.presets{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.presets button{padding:6px 11px;border:1px solid var(--line);background:#f7f9fc;border-radius:7px;font:inherit;font-weight:700;font-size:13px;color:var(--brand);cursor:pointer}
.presets button.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.hint{font-size:13px;color:var(--muted)}
.swatch{margin:12px auto 0;border:2px solid var(--brand2);background:#eaf1f8;border-radius:4px}

section.seo{background:#fff;border-top:1px solid var(--line);margin-top:34px;padding:34px 0}
section.seo h2{color:#0e2338;font-size:22px}
section.seo h3{color:var(--brand);font-size:17px;margin-top:22px}
section.seo p,section.seo li{font-size:15px;color:#31404f}
.faq dt{font-weight:700;margin-top:16px}
.faq dd{margin:4px 0 0}
table.dtable{width:100%;border-collapse:collapse;margin:14px 0;font-size:14.5px}
table.dtable th,table.dtable td{padding:8px;border:1px solid var(--line);text-align:left}
table.dtable th{background:#eef3f9}
table.dtable td.num,table.dtable th.num{text-align:right}

footer.site{background:#0e2338;color:#a8c2d8;font-size:13px;padding:24px 0;margin-top:0}
footer.site a{color:#b9d6ec}
footer.site .disc{font-size:12px;color:#7fa0bc;margin-top:8px}
@media(max-width:480px){h1{font-size:22px}.big-answer .round{font-size:28px}}