:root{
  --ink:#12202d; --muted:#52616d; --paper:#f7f9fb; --card:#ffffff;
  --line:#dfe6ec; --accent:#2868d8; --accent2:#0e8b7b; --warm:#f2a65a;
  --max:1120px; --radius:18px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:var(--accent);text-decoration-thickness:1.5px;text-underline-offset:2px}
img{max-width:100%;height:auto}
.wrap{width:min(var(--max),calc(100% - 36px));margin:auto}
.topnote{background:#0e1b2a;color:#dce8f5;font-size:.86rem;padding:.62rem 0}
.topnote a{color:#fff}
header{background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;backdrop-filter:blur(8px)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 0}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;color:white;font-size:.8rem}
nav{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
nav a{color:#2e3a45;text-decoration:none;font-size:.94rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:white!important;border-radius:999px;padding:11px 18px;text-decoration:none;font-weight:750;border:1px solid transparent}
.btn.secondary{background:white;color:var(--accent)!important;border-color:#bcd0ee}
.hero{padding:72px 0 50px;background:radial-gradient(circle at 85% 15%,#dfeafd 0,transparent 26%),linear-gradient(#fff,#f7f9fb)}
.hero-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:44px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.11em;font-size:.78rem;font-weight:800;color:var(--accent2)}
h1{font-size:clamp(2.15rem,5vw,4.7rem);line-height:1.04;letter-spacing:-.035em;margin:.35rem 0 1rem}
h2{font-size:clamp(1.55rem,3vw,2.35rem);line-height:1.16;letter-spacing:-.02em;margin:2.2rem 0 .7rem}
h3{font-size:1.18rem;line-height:1.28;margin:1.5rem 0 .4rem}
.lead{font-size:1.18rem;color:var(--muted);max-width:760px}
.hero-card,.card,.callout,.toc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 30px rgba(20,39,58,.05)}
.hero-card{padding:26px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{padding:22px}
.card h3{margin-top:.25rem}
.card p{color:var(--muted)}
.pill{display:inline-block;padding:5px 9px;border-radius:999px;background:#edf4ff;color:#2a5ba5;font-weight:750;font-size:.75rem}
main article{padding:45px 0 70px}
.article-grid{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:42px;align-items:start}
.prose{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.prose p,.prose li{color:#31414d}
.prose ul,.prose ol{padding-left:1.25rem}
.toc{padding:18px;position:sticky;top:92px}
.toc strong{display:block;margin-bottom:8px}
.toc a{display:block;text-decoration:none;padding:5px 0;font-size:.9rem}
.callout{padding:20px 22px;margin:24px 0;background:#f9fcff}
.callout.aff{border-color:#bfd4f4;background:#f3f8ff}
.callout.warn{border-color:#f3d1a8;background:#fff9f2}
.disclosure{font-size:.9rem;color:#435462;background:#f1f5f7;border:1px solid var(--line);padding:12px 14px;border-radius:12px;margin:18px 0}
.breadcrumbs{font-size:.86rem;color:var(--muted);padding-top:18px}
.breadcrumbs a{text-decoration:none}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;margin:18px 0}
table{width:100%;border-collapse:collapse;background:white;min-width:620px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f4f7fa}
.hero-robot{width:min(220px,80%);margin:auto;display:block}
.links{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}
.links a{background:#f5f8fb;border:1px solid var(--line);border-radius:999px;padding:7px 11px;text-decoration:none;font-size:.9rem}
footer{background:#0e1b2a;color:#c7d4df;padding:46px 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:30px}
footer a{color:#eaf2f8;text-decoration:none;display:block;margin:.35rem 0}
footer .small{font-size:.85rem;color:#9fb0bd;max-width:520px}
@media(max-width:850px){
  .hero-grid,.article-grid,.footer-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr 1fr}
  .toc{position:static}
  nav a:not(.btn){display:none}
}
@media(max-width:560px){.grid{grid-template-columns:1fr}.wrap{width:min(var(--max),calc(100% - 24px))}.prose{padding:22px}.hero{padding-top:48px}}