:root {
  --bg: #ffffff; --text: #1d1d1f; --muted: #5c5c66; --line: #dcdce2;
  --link: #0b57b0; --note-bg: #f3f3f6; --code-bg: #f3f3f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141417; --text: #e8e8ec; --muted: #a2a2ad; --line: #34343b;
    --link: #8ab8ff; --note-bg: #1f1f24; --code-bg: #1f1f24;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; color-scheme: light dark; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 0 16px; }
header { padding-top: 24px; }
header a { color: var(--text); font-weight: 600; text-decoration: none; }
main { padding-bottom: 32px; }
h1 { font-size: 2rem; line-height: 1.25; margin: 24px 0 8px; }
h2 { font-size: 1.25rem; margin: 36px 0 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 6px; }
p, ul, ol { margin: 0 0 12px; }
ul, ol { padding-left: 1.3em; }
li { margin-bottom: 6px; }
a { color: var(--link); overflow-wrap: anywhere; }
.lead { font-size: 1.15rem; }
.muted { color: var(--muted); }
.note { background: var(--note-bg); border-left: 4px solid var(--line); padding: 10px 14px; }
code, pre { font: 0.92em/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { background: var(--code-bg); padding: 1px 4px; border-radius: 3px; }
pre { background: var(--code-bg); padding: 10px 14px; overflow-x: auto; border-radius: 4px; }
pre code { background: none; padding: 0; }
table { border-collapse: collapse; margin: 0 0 12px; }
th, td { text-align: left; padding: 6px 16px 6px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; color: var(--muted); font-size: 0.95rem; }
footer nav a { margin-right: 16px; display: inline-block; }