:root {
  --ink: #1d1d1b;
  --mid: #5c5a55;
  --paper: #fbfaf7;
  --rule: #e4e1da;
  --link: #2f4a6b;
  --todo: #fff1b8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #ecebe7; --mid: #a9a69f; --paper: #161614; --rule: #2e2d2a; --link: #9cb8dc; --todo: #5a4a00; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}
.top, main, footer { max-width: 44rem; margin: 0 auto; padding: 0 20px; }
.top { padding-top: 28px; }
.mark { color: var(--ink); text-decoration: none; font-weight: 800; font-size: 15px; line-height: 0.95; letter-spacing: 0.02em; }
h1 { font-size: 2rem; line-height: 1.2; margin: 1.6em 0 0.4em; }
h2 { font-size: 1.15rem; margin: 2em 0 0.4em; }
.lead { color: var(--mid); font-size: 1.05rem; }
ul { padding-left: 1.2em; }
li { margin: 0.35em 0; }
a { color: var(--link); }
footer { margin-top: 4em; padding-top: 1em; padding-bottom: 3em; border-top: 1px solid var(--rule); color: var(--mid); font-size: 14px; }
.todo { background: var(--todo); padding: 0 4px; border-radius: 3px; }