:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --accent: #2f6bff; --rule: #e5e5ea; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --fg: #f5f5f7; --muted: #a1a1a6; --accent: #5b8cff; --rule: #2c2c2e; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Apple SD Gothic Neo", "Helvetica Neue", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 8px 0 12px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, li { color: var(--fg); }
.meta, .lang { color: var(--muted); font-size: 15px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 48px 0; }
ul { padding-left: 1.2em; }