body{margin:0;background:#f6f7fb;color:#172033;font:17px/1.65 system-ui,sans-serif}main{max-width:850px;margin:auto;padding:32px 24px}section{scroll-margin-top:24px;margin:36px 0}a{color:#4930b5}nav{margin:24px 0}button{font:inherit;padding:10px 20px;cursor:pointer}button:disabled{cursor:wait}h1,h2,h3{line-height:1.25}