html,body{padding:0;margin:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#1a1a2e;background:transparent;line-height:1.5}*,*:before,*:after{box-sizing:border-box}.app-shell{width:100%;max-width:960px;margin:0 auto;padding:1.5rem}