:root { --paper:#f6f8fa; --ink:#12161b; --ink-2:#414b55; --ink-3:#626d79; --rule:#e1e6eb;
  --accent:#1c5cab; --serif: Georgia, 'Iowan Old Style', 'Times New Roman', serif; }
* { box-sizing: border-box; }
body { margin:0; background:var(--paper); color:var(--ink-2); font-size:15px; line-height:1.62;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; }
.wrap { max-width: 44rem; margin: 0 auto; padding: 3rem 1.5rem 4rem; }
h1, h2 { font-family: var(--serif); color: var(--ink); font-weight: 600; }
h1 { font-size: 1.75rem; margin: 0 0 .35rem; }
h2 { font-size: 1.15rem; margin: 2.2rem 0 .6rem; }
a { color: var(--accent); }
.lede { color: var(--ink-3); font-size: .875rem; margin: 0 0 2rem; }
.back { display:inline-block; margin-bottom:2rem; font-size:.82rem; }
ul { padding-left: 1.15rem; }
li { margin-bottom: .5rem; }
code { background:#eceff3; padding:.08rem .3rem; border-radius:2px; font-size:.86em; }
footer { border-top:1px solid var(--rule); margin-top:3rem; padding-top:1rem;
  font-size:.8rem; color:var(--ink-3); }