:root{
  --bg:#f4f7fb;--paper:#fff;--paper2:#f9fbfe;--ink:#101827;--muted:#65748a;--line:#dbe4f0;--line2:#c5d1e1;--blue:#1f4ed8;--blue2:#315fcb;--blueDark:#17356d;--soft:#eef4ff;--green:#0f766e;--amber:#a16207;--red:#b42318;--radius:22px;--shadow:0 24px 70px rgba(15,23,42,.08);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:linear-gradient(180deg,#fff 0%,var(--bg) 36%,var(--bg) 100%);line-height:1.62;font-size:16px}a{color:inherit}.wrap{width:min(1180px,calc(100% - 40px));margin:0 auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.93);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-size:30px;font-weight:800;text-decoration:none;color:#10223f;letter-spacing:-.04em;white-space:nowrap}.logo span{color:var(--blue)}.links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;font-size:15px;font-weight:700}.links a{color:#233044;text-decoration:none}.links a:hover,.links a[aria-current=page]{color:var(--blue)}.access{padding:11px 18px;border-radius:999px;background:var(--blue);color:#fff!important;box-shadow:0 12px 24px rgba(31,78,216,.16)}
.progress{position:fixed;left:0;top:0;height:3px;background:linear-gradient(90deg,var(--blue),#62a6ff);width:0%;z-index:80}.breadcrumb{padding:18px 0 0;color:var(--muted);font-size:13px}.breadcrumb a{text-decoration:none;color:#475569}.breadcrumb a:hover{color:var(--blue)}.articleHero{padding:34px 0 26px}.heroCard{background:var(--paper);border:1px solid var(--line);border-radius:34px;padding:42px;box-shadow:var(--shadow);display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:28px;align-items:stretch;overflow:hidden;position:relative}.heroCard:after{content:"";position:absolute;right:-160px;top:-160px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(31,78,216,.12),transparent 70%)}.heroText,.heroAside{position:relative;z-index:1}.eyebrow{display:inline-flex;padding:8px 13px;border-radius:999px;background:var(--soft);color:var(--blueDark);font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.045em;margin-bottom:17px}h1{margin:0;max-width:820px;font-size:clamp(34px,5vw,58px);line-height:1.04;letter-spacing:-.055em}.lead{max-width:820px;margin:20px 0 0;color:var(--muted);font-size:19px}.heroMeta{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.metaPill{display:inline-flex;padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:var(--paper2);color:#334155;font-size:13px;font-weight:700}.heroAside{background:#10223f;color:#fff;border-radius:24px;padding:22px;display:flex;flex-direction:column;justify-content:space-between;gap:18px}.heroAside h2{margin:0 0 9px;font-size:20px;letter-spacing:-.025em}.heroAside p{margin:0;color:rgba(255,255,255,.78);font-size:14px}.asideGrid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.asideCell{border:1px solid rgba(255,255,255,.17);background:rgba(255,255,255,.08);border-radius:15px;padding:11px;font-size:13px}.asideCell b{display:block;color:#fff;margin-bottom:2px}.btnRow{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;min-height:48px;align-items:center;justify-content:center;padding:0 20px;border-radius:14px;font-weight:800;text-decoration:none;border:1px solid transparent}.btnBlue{background:var(--blue);color:#fff}.btnWhite{background:#fff;border-color:var(--line2);color:#1e293b}.layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:30px;align-items:start;padding-bottom:70px}.article{background:var(--paper);border:1px solid var(--line);border-radius:30px;padding:36px;box-shadow:0 14px 40px rgba(15,23,42,.045)}.article h2{margin:42px 0 14px;font-size:30px;line-height:1.15;letter-spacing:-.035em;scroll-margin-top:94px}.article h2:first-child{margin-top:0}.article h3{margin:28px 0 10px;font-size:21px;letter-spacing:-.02em}.article p{margin:0 0 16px;color:#263244}.article ul,.article ol{margin:0 0 18px;padding-left:22px;color:#263244}.article li{margin:7px 0}.article strong{color:#111827}.toc{position:sticky;top:92px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:0 10px 30px rgba(15,23,42,.045)}.tocTitle{font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);font-weight:800;margin-bottom:12px}.toc a{display:block;color:#475569;text-decoration:none;font-size:14px;padding:7px 0;border-bottom:1px solid #eef2f7}.toc a:hover{color:var(--blue)}.tocCta{margin-top:17px;border-radius:18px;background:var(--soft);padding:14px}.tocCta b{display:block;font-size:14px;margin-bottom:6px;color:var(--blueDark)}.tocCta p{font-size:13px;color:var(--muted);margin:0 0 10px}.tocCta a{display:inline-flex;border:0;background:var(--blue);color:#fff;text-decoration:none;border-radius:12px;padding:9px 12px;font-weight:800;font-size:13px}.note,.calcBox,.sourceNote{border-radius:20px;padding:20px;margin:22px 0;border:1px solid var(--line);background:var(--paper2)}.note{border-left:4px solid var(--blue);background:#f7fbff}.note b,.sourceNote b{display:block;margin-bottom:7px;color:var(--blueDark)}.calcBox{background:#10223f;color:#fff;border:0}.calcBox h3{color:#fff;margin-top:0}.calcBox p,.calcBox li{color:rgba(255,255,255,.82)}.formulaGrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.formula{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.formula code{font-family:"SF Mono",Consolas,monospace;color:#10223f;font-weight:800}.formula span{display:block;color:var(--muted);font-size:13px;margin-top:6px}.tableWrap{overflow:auto;border:1px solid var(--line);border-radius:20px;margin:22px 0;background:#fff}table{width:100%;border-collapse:collapse;min-width:680px}th,td{padding:13px 14px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left}th{background:#f3f7fc;color:#111827;font-size:14px}td{color:#334155;font-size:14px}tr:last-child td{border-bottom:0}.figure{margin:26px 0;background:#fff;border:1px solid var(--line);border-radius:24px;padding:16px}.figure img{display:block;width:100%;height:auto;border-radius:14px;border:1px solid #eef2f7;background:#fff}.caption{margin:12px 4px 0;color:var(--muted);font-size:14px}.caption b{color:#334155}.ctaBand{margin:34px 0;border-radius:26px;padding:26px;background:linear-gradient(135deg,var(--blueDark),var(--blue));color:#fff;display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;overflow:hidden;position:relative}.ctaBand:before{content:"";position:absolute;inset:0;background-image:linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(180deg,rgba(255,255,255,.07) 1px,transparent 1px);background-size:34px 34px}.ctaBand>*{position:relative}.ctaBand h3{margin:0 0 6px;color:#fff}.ctaBand p{margin:0;color:rgba(255,255,255,.78)}.ctaBand .btn{background:#fff;color:var(--blueDark);white-space:nowrap}.miniCards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:20px 0}.miniCard{border:1px solid var(--line);background:#fff;border-radius:18px;padding:16px}.miniCard b{display:block;margin-bottom:5px}.miniCard span{color:var(--muted);font-size:14px}.references{margin-top:46px;padding-top:28px;border-top:1px solid var(--line)}.references h2{margin-top:0}.references ol{font-size:14px;color:#334155}.references li{margin-bottom:10px}.foot{padding:32px 0 48px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}.foot a{color:var(--muted);text-decoration:none;margin-left:16px}.sup{font-size:.75em;vertical-align:super;color:var(--blue);font-weight:800;text-decoration:none}.statusDraft{display:inline-flex;margin-left:8px;padding:2px 7px;border-radius:999px;background:#fff7ed;color:#9a3412;border:1px solid #fed7aa;font-size:12px;font-weight:800}
@media(max-width:1000px){.heroCard,.layout{grid-template-columns:1fr}.toc{position:static;order:-1}.heroAside{min-height:260px}}@media(max-width:700px){.wrap{width:min(100% - 28px,1180px)}.nav{align-items:flex-start;flex-direction:column;padding:16px 0}.links{gap:12px}.heroCard,.article{padding:24px 18px;border-radius:24px}.formulaGrid,.miniCards,.ctaBand{grid-template-columns:1fr}.asideGrid{grid-template-columns:1fr}.ctaBand .btn{width:100%}}