:root { --bg: #fafaf9; --fg: #1c1917; --muted: #78716c; --line: #e7e5e4; --link: #1d4ed8; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #1c1917; --fg: #f5f5f4; --muted: #a8a29e; --line: #44403c; --link: #93c5fd; }
}
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.7 system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px; }
h1 { font-size: 1.6rem; margin: 0 0 .5rem; }
h2 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
.meta { color: var(--muted); margin-top: 0; }
a { color: var(--link); }
code { font-size: .9em; }
hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }