:root{
  --bg:#f7f8fa; --card:#fff; --ink:#14181f; --muted:#5b6472; --line:#e3e6eb;
  --brand:#0b6bcb; --brand-ink:#fff; --accent:#0f9d6b; --warn:#c2410c;
  --c1:#0b6bcb; --c2:#0f9d6b; --c3:#e59f16; --c4:#9b51e0;
  --radius:14px; --shadow:0 1px 2px rgba(0,0,0,.04),0 4px 16px rgba(0,0,0,.05);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f1217;--card:#171b22;--ink:#e8ebf0;--muted:#9aa3b2;--line:#2a303a;--brand:#4c9ff0;--accent:#34c38f;--shadow:none}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
a{color:var(--brand)}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px;flex-wrap:wrap}
.logo{font-weight:800;font-size:1.15rem;text-decoration:none;color:var(--ink)}
.logo span{color:var(--brand)}
nav.top a{margin-right:16px;color:var(--muted);text-decoration:none;font-size:.95rem}
nav.top a:hover{color:var(--ink)}
.hero{padding-top:28px;padding-bottom:8px}
.hero h1{font-size:clamp(1.6rem,4vw,2.3rem);line-height:1.2;margin:0 0 8px}
.hero p{color:var(--muted);margin:0;max-width:720px}
.grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:20px;margin:20px 0}
@media (max-width:820px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.card h2{margin:0 0 14px;font-size:1.15rem}
.field{margin-bottom:14px}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}
.field .hint{color:var(--muted);font-size:.8rem;font-weight:400}
.inp{position:relative;display:flex;align-items:center}
.inp input,.inp select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:var(--bg);color:var(--ink)}
.inp input:focus,.inp select:focus{outline:2px solid var(--brand);outline-offset:1px}
.inp .pre,.inp .suf{position:absolute;color:var(--muted);font-size:.9rem;pointer-events:none}
.inp .pre{left:12px}.inp .pre+input{padding-left:26px}
.inp .suf{right:12px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.btn{display:inline-block;background:var(--brand);color:var(--brand-ink);border:0;border-radius:10px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer;width:100%}
.btn:hover{filter:brightness(1.07)}
.big{font-size:clamp(1.9rem,5vw,2.6rem);font-weight:800;line-height:1.1;color:var(--brand);margin:4px 0 2px}
.sub{color:var(--muted);font-size:.9rem}
.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0}
.stat{border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat b{display:block;font-size:1.1rem}
.stat span{color:var(--muted);font-size:.8rem}
.legend{display:flex;flex-wrap:wrap;gap:12px;font-size:.85rem;color:var(--muted);margin-top:8px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.chart{width:100%;height:auto;display:block}
.tablewrap{max-height:380px;overflow:auto;border:1px solid var(--line);border-radius:10px;margin-top:12px}
table{width:100%;border-collapse:collapse;font-size:.88rem}
th,td{padding:8px 10px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{position:sticky;top:0;background:var(--card)}
details.sched summary{cursor:pointer;font-weight:600;margin-top:14px}
.ad-slot{margin:22px auto;min-height:100px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--line);border-radius:10px;color:var(--muted);font-size:.75rem;letter-spacing:.06em;text-transform:uppercase}
.ad-slot.side{min-height:250px}
article.content{max-width:760px;margin:10px auto 30px}
article.content h2{font-size:1.4rem;margin:30px 0 8px}
article.content h3{font-size:1.1rem;margin:22px 0 6px}
article.content p,article.content li{color:var(--ink)}
.formula{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:ui-monospace,Consolas,monospace;overflow-x:auto}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:8px 0}
.faq summary{cursor:pointer;font-weight:600}
.note{font-size:.85rem;color:var(--muted);border-left:3px solid var(--line);padding-left:12px}
.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;margin:14px 0}
.related a{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px;text-decoration:none;color:var(--ink);font-weight:600}
.related a:hover{border-color:var(--brand)}
footer.site{border-top:1px solid var(--line);background:var(--card);padding:22px 0;color:var(--muted);font-size:.85rem}
footer.site a{color:var(--muted);margin-right:14px}
.legal{max-width:760px;margin:30px auto}
.legal h1{font-size:1.8rem}