:root{
  --ink:#17212b;--muted:#5e6a75;--paper:#fbfaf7;--card:#ffffff;--line:#dfe5e8;
  --brand:#4055a8;--brand2:#769f91;--soft:#eef2ff;--warm:#f2eee4;--accent:#e8f2ed;
  --max:1180px;--radius:18px;--shadow:0 14px 40px rgba(23,33,43,.08);
}
*{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(--brand);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration-thickness:2px}
.container{width:min(var(--max),calc(100% - 32px));margin:auto}
.topbar{background:#111923;color:#eef4f7;font-size:.9rem}.topbar .container{padding:8px 0;display:flex;justify-content:center;text-align:center}
header{position:sticky;top:0;z-index:30;background:rgba(251,250,247,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:20px}.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,var(--brand),var(--brand2));display:grid;place-items:center;color:white;font-weight:900}
.navlinks{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.navlinks a{color:var(--ink);text-decoration:none;font-weight:650;font-size:.95rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:12px 18px;background:var(--brand);color:white!important;text-decoration:none!important;font-weight:750;border:1px solid transparent}.btn.secondary{background:white;color:var(--ink)!important;border-color:var(--line)}.btn.small{padding:9px 14px;font-size:.92rem}
.hero{padding:72px 0 50px;background:radial-gradient(circle at 80% 10%,#e8f2ed 0,transparent 33%),radial-gradient(circle at 15% 10%,#eef2ff 0,transparent 34%)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-weight:800;font-size:.78rem;color:var(--brand)}
h1,h2,h3{line-height:1.12;letter-spacing:-.035em}h1{font-size:clamp(2.55rem,6vw,5.5rem);margin:.18em 0 .28em}h2{font-size:clamp(1.75rem,3.8vw,3rem);margin:1.8em 0 .5em}h3{font-size:1.3rem;margin:1.5em 0 .45em}
.lede{font-size:clamp(1.08rem,2vw,1.28rem);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:var(--shadow)}
.hero-card{padding:26px}.signal{display:grid;grid-template-columns:48px 1fr;gap:14px;align-items:start;padding:14px 0;border-bottom:1px solid var(--line)}.signal:last-child{border:0}.icon{width:42px;height:42px;border-radius:12px;background:var(--soft);display:grid;place-items:center;font-weight:900;color:var(--brand)}
.section{padding:56px 0}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.card{padding:24px}.card p{color:var(--muted)}.card h3{margin-top:0}.meta{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.pill{display:inline-flex;padding:6px 10px;border-radius:999px;background:var(--soft);font-size:.82rem;font-weight:700}
.article{display:grid;grid-template-columns:minmax(0,760px) 290px;gap:48px;align-items:start}.content{font-size:1.04rem}.content p{margin:0 0 1.1em}.content ul,.content ol{padding-left:1.4em}.content li{margin:.42em 0}.toc{padding:18px;position:sticky;top:96px}.toc strong{display:block;margin-bottom:8px}.toc a{display:block;color:var(--muted);text-decoration:none;padding:5px 0}
.breadcrumbs{font-size:.88rem;color:var(--muted);padding:20px 0 0}.breadcrumbs a{color:var(--muted)}
.callout{padding:24px;margin:32px 0;background:linear-gradient(135deg,#eef2ff,#f5faf7)}.callout h3{margin-top:0}.disclosure{font-size:.86rem;color:var(--muted);border-left:3px solid var(--brand2);padding-left:12px;margin:12px 0}
table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:24px 0;background:white}th,td{padding:13px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}th{background:#f4f6f7}tr:last-child td{border-bottom:0}
.note{padding:16px 18px;background:var(--warm);border-radius:14px;margin:22px 0}.kicker{font-weight:800;color:var(--brand)}.steps{counter-reset:steps}.step{position:relative;padding:0 0 18px 52px}.step:before{counter-increment:steps;content:counter(steps);position:absolute;left:0;top:0;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:white;font-weight:800}
footer{margin-top:60px;background:#111923;color:#dbe3e7;padding:48px 0 28px}footer a{color:#dbe3e7}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}.fine{font-size:.86rem;color:#9eabb3;margin-top:30px}.cluster-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 20px}.cluster-list a{padding:8px 0}
.mobile-toggle{display:none}
@media(max-width:860px){.hero-grid,.article,.grid3,.grid2,.footer-grid{grid-template-columns:1fr}.article{gap:10px}.toc{position:relative;top:auto;order:-1}.navlinks{display:none}.mobile-toggle{display:inline-flex}.nav.open .navlinks{display:flex;position:absolute;left:0;right:0;top:72px;background:var(--paper);padding:18px 16px;border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start}.hero{padding-top:46px}.cluster-list{grid-template-columns:1fr}h1{font-size:3rem}}
@media(max-width:500px){.container{width:min(var(--max),calc(100% - 22px))}.hero-card,.card,.callout{padding:19px}.btn{width:100%}.nav .btn.small{width:auto}}