:root {
  --bg: #ffffff;
  --fg: #1f2329;
  --muted: #5b6370;
  --line: #e5e7eb;
  --code-bg: #f3f4f6;
  --accent: #15803d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --line: #2a2e36;
    --code-bg: #1d2127;
    --accent: #4ade80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.75 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Segoe UI", sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header {
  display: flex; align-items: center; gap: 18px;
  padding-top: 48px; padding-bottom: 24px; border-bottom: 1px solid var(--line);
}
header img { border-radius: 16px; flex: none; }
header h1 { margin: 0; font-size: 30px; line-height: 1.2; }
header p { margin: 4px 0 0; color: var(--muted); }
header nav { margin-left: auto; align-self: flex-start; font-size: 15px; }
h2 { font-size: 23px; margin: 40px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
a { color: var(--accent); }
code { background: var(--code-bg); border-radius: 5px; padding: 1px 6px; font: 0.88em ui-monospace, SFMono-Regular, Menlo, monospace; }
pre { background: var(--code-bg); border-radius: 10px; padding: 14px 16px; overflow-x: auto; }
pre code { padding: 0; background: none; }
details { border-top: 1px solid var(--line); padding: 10px 0; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
footer { margin-top: 56px; padding-top: 20px; padding-bottom: 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
@media (max-width: 560px) {
  header { flex-wrap: wrap; padding-top: 28px; }
  header nav { margin-left: 0; }
}