:root { color-scheme: light dark; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; line-height: 1.55; margin: 0; padding: 0; }
main, header, footer { max-width: 920px; margin: 0 auto; padding: 20px; }
header { border-bottom: 1px solid rgba(127,127,127,.25); }
nav a { margin-right: 10px; }
section { margin: 18px 0; padding: 14px; border: 1px solid rgba(127,127,127,.25); border-radius: 10px; }
small, .muted { opacity: .8; }
code { padding: 2px 6px; border-radius: 6px; background: rgba(127,127,127,.12); }