*,::after,::before{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;line-height:1.6;color:#1a1a1a}a{color:inherit}main{max-width:900px;margin:0 auto;padding:2rem 1rem}header{padding:1rem;border-bottom:1px solid #e5e5e5}header nav a{margin-right:1rem;text-decoration:none}footer{padding:2rem 1rem;border-top:1px solid #e5e5e5;text-align:center;font-size:.875rem;color:#666}