:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --link: #0366d6;
  --border: #eaeaea;
  --code-bg: #f6f8fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #8b949e;
    --link: #58a6ff;
    --border: #30363d;
    --code-bg: #161b22;
  }
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
header { margin-bottom: 2rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
header h1 { font-size: 1.25rem; margin: 0; }
nav { font-size: 0.9rem; margin-top: 0.5rem; color: var(--muted); }
nav a { margin-right: 1rem; }
article h1 { margin-top: 0; }
.meta { color: var(--muted); font-size: 0.9em; margin-bottom: 1.5rem; }
.meta a { margin-right: 0.5em; }
pre { background: var(--code-bg); padding: 1rem; overflow-x: auto; border-radius: 6px; border: 1px solid var(--border); }
code { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace; font-size: 0.9em; }
:not(pre) > code { background: var(--code-bg); padding: 0.15em 0.4em; border-radius: 3px; }
img { max-width: 100%; height: auto; }
hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
ul li { margin-bottom: 0.25em; }