:root{color-scheme:light;--bg:#f4f6f8;--ink:#18212f;--muted:#667085;--line:#d0d5dd;--blue:#2563eb}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 'Segoe UI',Arial,sans-serif}
.wrap{max-width:960px;margin:auto;padding:0 20px}header{background:#fff;border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:16px;padding-bottom:16px;flex-wrap:wrap}
.brand{font-size:20px;font-weight:750;color:var(--ink);text-decoration:none}nav{display:flex;flex-wrap:wrap;gap:8px 18px}
nav a,footer a{color:#1d4ed8;text-decoration:none}a{text-underline-offset:3px}a:hover{text-decoration:underline}
main{padding-top:32px;padding-bottom:44px}article,.callout{background:white;border:1px solid #e5e7eb;border-radius:14px;padding:26px 30px;margin-bottom:18px;box-shadow:0 8px 28px rgba(0,0,0,.04)}
h1{font-size:clamp(27px,4vw,36px);line-height:1.2;margin:0 0 10px}h2{font-size:21px;line-height:1.3;margin:30px 0 8px}h2:first-child{margin-top:0}
p,li{max-width:72ch}li{margin:8px 0}.lead{font-size:18px;color:#475467}.callout{background:#eff6ff;border-color:#bfdbfe}
.button{display:inline-block;padding:10px 16px;border-radius:8px;background:var(--blue);color:white;text-decoration:none;font-weight:650}
.button:hover{background:#1d4ed8;text-decoration:none}footer{border-top:1px solid var(--line);background:white;padding:28px 0;color:#475467;font-size:14px}
footer .links{display:flex;gap:10px 18px;flex-wrap:wrap;margin-top:10px}.muted{color:var(--muted);font-size:14px}
@media(max-width:600px){article,.callout{padding:20px}main{padding-top:20px}}
@media print{header,footer,.button{display:none}body{background:white}article,.callout{border:0;box-shadow:none;padding:0}main{padding:0}}