:root {
  --bg: #f6f7fb; --fg: #1d2333; --muted: #5d6679; --line: #d8dce6; --head: #eceff6; --link: #3e63dd; --brand: #4a37b4;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14121f; --fg: #e8e9f0; --muted: #a3a8ba; --line: #34314a; --head: #211e33; --link: #9db4ff; --brand: #8f7cf2; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--fg); }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
header.site img { width: 48px; height: 48px; border-radius: 12px; }
header.site a { color: var(--fg); text-decoration: none; font-weight: 700; font-size: 18px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
.muted { color: var(--muted); }
a { color: var(--link); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.table { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
td, th { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--head); }
nav.toc { background: var(--head); border-radius: 12px; padding: 12px 18px; margin: 20px 0; font-size: 15px; }
nav.toc ol { margin: 6px 0; padding-left: 20px; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px; }
.btn { display: inline-block; background: var(--brand); color: #fff; padding: 10px 18px; border-radius: 10px; text-decoration: none; font-weight: 600; margin: 4px 8px 4px 0; }