*{box-sizing:border-box}body{margin:0;font:15px/1.6 -apple-system,Segoe UI,Roboto,Arial,sans-serif;color:#1f2328;background:#fff}
.wrap{max-width:920px;margin:0 auto;padding:0 20px}header{border-bottom:1px solid #e5e7eb;padding:18px 0}
header .wrap{display:flex;align-items:center;justify-content:space-between}h1{font-size:18px;margin:0}
nav a{margin-left:18px;color:#2563eb;text-decoration:none;font-size:14px}
main{padding:36px 0 60px}h2{font-size:24px;margin:0 0 14px}ul{padding-left:20px}
.muted{color:#6b7280;font-size:13px}footer{border-top:1px solid #e5e7eb;padding:18px 0;color:#6b7280;font-size:13px}