:root {
  --bg: #ffffff; --fg: #1c1d22; --muted: #5d6170; --line: #e4e6ec; --accent: #3a6ff7; --card: #f6f7fa;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111318; --fg: #eceef3; --muted: #a2a7b5; --line: #262a33; --accent: #8cb0ff; --card: #181b22; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 80px; }
header.site { display: flex; align-items: center; gap: 10px; margin-bottom: 40px; }
header.site a { color: var(--fg); text-decoration: none; font-weight: 650; font-size: 18px; }
header.site nav { margin-left: auto; display: flex; gap: 18px; }
header.site nav a { font-weight: 500; font-size: 15px; color: var(--muted); }
img.logo { width: 28px; height: 28px; border-radius: 7px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 36px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p, li { color: var(--fg); }
.lead { font-size: 19px; color: var(--muted); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
ul { padding-left: 22px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 8px 0 16px; display: block; overflow-x: auto; }
th, td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 10px 8px 0; vertical-align: top; }
kbd { font: 13px ui-monospace, Menlo, monospace; background: var(--card); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 20px 0; }
footer { margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }