:root { color-scheme: light dark; font: 16px/1.85 -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif; color: #2b3c52; background: #f5f7fa; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 48px 24px 72px; overflow-wrap: anywhere; }
h1, h2 { line-height: 1.45; }
h1 { font-size: 28px; margin: 24px 0 8px; }
h2 { font-size: 19px; margin-top: 36px; }
p { margin: 12px 0; }
a { color: #3d5474; text-underline-offset: 4px; }
a:focus-visible { outline: 2px solid currentColor; outline-offset: 4px; }
.brand { font-weight: 600; text-decoration: none; }
.date { font-size: 13px; color: #627187; }
.intro { font-size: 18px; margin: 28px 0; }
li { margin: 8px 0; }
code { font-size: 0.9em; }
@media (prefers-color-scheme: dark) { :root { color: #e9eef6; background: #131a24; } a { color: #a8c0e8; } .date { color: #a0aec2; } }