:root{color-scheme:light dark}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65;max-width:760px;margin:0 auto;padding:2rem 1.25rem;color:#222;background:#fff}
@media (prefers-color-scheme:dark){body{color:#ddd;background:#141414}a{color:#7ab7ff}}
h1{font-size:1.8rem;margin-bottom:.2rem}h2{margin-top:2rem;font-size:1.25rem;border-bottom:1px solid #8884;padding-bottom:.3rem}
nav{margin-bottom:1.5rem}nav a{margin-right:1rem}
.zh{margin-top:3rem;padding-top:1rem;border-top:2px solid #8886}
footer{margin-top:3rem;font-size:.9rem;color:#888}