:root{--ink:#0f172a;--muted:#475569;--line:#e2e8f0;--soft:#f8fafc;--blue:#2563eb;--blue-d:#1d4ed8;--blue-50:#eff6ff}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:#1e293b;background:#fff;line-height:1.7}
a{color:var(--blue-d)}img{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}.narrow{max-width:820px}
.hdr{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.hdr-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}.brand img{border:1px solid var(--line);border-radius:8px;padding:3px;background:var(--soft)}
.brand b{display:block;font-size:19px;line-height:1.1;white-space:nowrap}.brand small{display:block;font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
.nav{display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px;font-size:14px;font-weight:500}.nav a{color:#334155;text-decoration:none;white-space:nowrap}.nav a:hover,.nav a[aria-current]{color:var(--blue)}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;font-weight:700;text-decoration:none;font-size:15px}
.nav .btn{color:#fff;padding:8px 14px;font-size:14px}.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover{background:var(--blue)}
.btn-blue{background:var(--blue);color:#fff}.btn-blue:hover{background:var(--blue-d)}.btn-ghost{border:1px solid #cbd5e1;color:var(--ink);background:#fff}
.hero{background:linear-gradient(180deg,var(--blue-50),#fff);border-bottom:1px solid var(--line);padding:48px 0 40px}
.crumbs{font-size:13px;color:#64748b;margin:0 0 14px}.crumbs a{color:#64748b;text-decoration:none}.crumbs span{margin:0 4px}
.eyebrow{display:block;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin:0 0 8px}
h1{font-size:clamp(30px,5vw,46px);line-height:1.15;color:var(--ink);margin:0 0 16px;letter-spacing:-.02em}
.lead{font-size:19px;color:var(--muted);margin:0}
.prose{padding-top:36px;padding-bottom:48px;font-size:17px}
.prose h2{font-size:27px;line-height:1.25;color:var(--ink);margin:44px 0 12px}.prose h3{font-size:20px;color:var(--ink);margin:28px 0 8px}
.prose ul,.prose ol{padding-left:22px}.prose li{margin:6px 0}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:15px;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}.prose th{background:var(--soft)}
.note{background:var(--blue-50);border-left:4px solid var(--blue);padding:14px 18px;border-radius:6px}
.tags{display:flex;flex-wrap:wrap;gap:8px;padding:0;list-style:none}.tags li{background:#f1f5f9;border:1px solid var(--line);border-radius:999px;padding:3px 12px;font-size:14px;margin:0}
video{width:100%;border-radius:14px;border:1px solid var(--line);background:#0f172a;margin:8px 0 4px}
.faq{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:10px 0;background:var(--soft)}.faq summary{font-weight:700;cursor:pointer;color:var(--ink)}.faq p{margin:10px 0 0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin:20px 0}
.card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;padding:20px;text-decoration:none;color:inherit;background:#fff}.card:hover{border-color:var(--blue);box-shadow:0 6px 20px rgba(37,99,235,.08)}
.card h3{margin:0 0 6px;font-size:19px;color:var(--ink);line-height:1.3}.card p{margin:0 0 12px;font-size:15px;color:var(--muted)}.card .more{margin-top:auto;font-weight:700;color:var(--blue);font-size:14px}
.meta{font-size:14px;color:#64748b}
.cta{background:var(--ink);color:#cbd5e1;padding:48px 0}.cta h2{color:#fff;margin:0 0 10px;font-size:28px}.cta-btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.ftr{background:#0b1220;color:#94a3b8;font-size:14px;padding:36px 0 18px}.ftr a{color:#cbd5e1;text-decoration:none}.ftr b{color:#fff}
.ftr-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;line-height:1.9}.copy{margin-top:22px;font-size:13px}
@media (max-width:640px){.hero{padding:32px 0 28px}.lead{font-size:17px}.prose{font-size:16px}.nav{gap:4px 14px}}