:root {
  --paper: #fbfbfd;
  --ink: #1d1f2b;
  --soft: #5a5f73;
  --rule: #e2e4ec;
  --accent: #4338ca;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #15161d; --ink: #e9eaf1; --soft: #a3a7ba; --rule: #2c2e3a; --accent: #a5b4fc; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 38rem; margin: 0 auto; padding: 3.5rem 1rem 3rem; }
header { border-bottom: 1px solid var(--rule); padding-bottom: 1.5rem; margin-bottom: 0.5rem; }
.by { margin: 0 0 0.25rem; color: var(--soft); font-size: 0.95rem; }
h1 { margin: 0; font-size: 2.25rem; line-height: 1.15; letter-spacing: -0.02em; }
.lead { margin: 0.75rem 0 0; color: var(--soft); font-size: 1.1rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; }
p, ul { margin: 0 0 0.75rem; }
ul { padding-left: 1.2rem; }
li { margin-bottom: 0.4rem; }
a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
footer { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); color: var(--soft); font-size: 0.95rem; }