body,h1,h2,h3,p,ul,ol,dl,figure{margin:0;padding:0}
*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#1f2933;
     background:#fff;line-height:1.65}
@media (max-width: 900px){
  .doc-wrap{display:block!important}
  .doc-toc{position:static!important;width:auto!important;border:0!important;
           padding:0 0 18px 0!important}
}