:root { --bg: #f7f6f2; --ink: #17181b; --ink2: #5c5e66; --line: #e2e0d8; --link: #17181b; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #111214; --ink: #ecebe6; --ink2: #9a9ca3; --line: #2a2b2f; --link: #ecebe6; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.7 -apple-system, "PingFang SC", "Helvetica Neue", sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 36px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
p, li { margin: 8px 0; }
ul { padding-left: 20px; }
a { color: var(--link); text-underline-offset: 3px; }
.meta, .back { color: var(--ink2); font-size: 14px; }
.back a { color: var(--ink2); text-decoration: none; }