:root{--fg:#1f2328;--muted:#57606a;--line:#d0d7de;--brand:#0b5c5c}
*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;max-width:860px;margin:0 auto;padding:0 20px;color:var(--fg);line-height:1.6}
header.site{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:18px 0;margin-bottom:28px;flex-wrap:wrap;gap:10px}
.brand{font-weight:700;font-size:18px;color:var(--brand);text-decoration:none}
nav a{margin-left:18px;color:var(--fg);text-decoration:none;font-size:15px}
nav a:hover{color:var(--brand)}
h1{font-size:26px;margin:8px 0 16px}h2{font-size:18px;margin-top:28px}
.lead{font-size:18px;color:var(--muted)}
ul{padding-left:20px}li{margin:6px 0}a{color:var(--brand)}
footer{border-top:1px solid var(--line);margin-top:48px;padding:20px 0;font-size:13px;color:var(--muted)}
@media(max-width:560px){header.site{flex-direction:column;align-items:flex-start}nav a{margin:0 14px 0 0}}