:root{--fg:#1b1f23;--bg:#fff;--link:#0b57d0}*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,sans-serif;color:var(--fg);background:var(--bg)}
.wrap{max-width:900px;margin:40px auto;padding:0 20px;line-height:1.6}
h1{font-size:2rem;margin:.2rem 0 1rem}h2{font-size:1.25rem;margin:1.5rem 0 .5rem}
a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}