:root { color-scheme: dark; }
  body { margin:0; padding:2rem 1.25rem 4rem; background:#07171d; color:#dff9ff;
         font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; }
  main { max-width: 46rem; margin:0 auto; }
  h1 { font-size:1.6rem; line-height:1.25; margin:0 0 .35rem; }
  h2 { font-size:1.05rem; margin:2rem 0 .5rem; color:#8ff0ff; }
  p, li { color:#cfe9f0; }
  ul { padding-left:1.15rem; }
  a { color:#8ff0ff; }
  strong { color:#e9fbff; }