:root{
  --bg:#ffffff;--ink:#1a1a1a;--muted:#777;--line:#e8e8e8;--code:#f6f6f6;
}
:root[data-theme="dark"]{
  --bg:#111417;--ink:#e6e6e6;--muted:#9aa0a6;--line:#2a2f35;--code:#1c2126;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
*,*::before,*::after{transition:background-color .3s ease,color .3s ease,border-color .3s ease}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.75;font-size:17px;-webkit-font-smoothing:antialiased}
.wrap{max-width:680px;margin:0 auto;padding:0 24px 120px}
header{padding:100px 0 22px;border-bottom:1px solid var(--line);position:relative}
.site{font-size:13px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase}
.title{font-size:42px;font-weight:700;letter-spacing:-.01em;margin:14px 0 10px}
.tagline{font-size:18px;color:var(--muted);margin:0}
#theme-toggle{position:absolute;top:22px;right:0;background:none;border:1px solid var(--line);color:var(--ink);
  border-radius:6px;padding:4px 10px;cursor:pointer;font-size:14px}
nav{padding:22px 0;border-bottom:1px solid var(--line)}
nav ol{list-style:none;margin:0;padding:0}
nav li{margin:0;padding:5px 0}
nav a{color:inherit;text-decoration:none;display:flex;gap:10px;align-items:baseline}
nav a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:4px}
.cat{font-size:12px;color:var(--muted);min-width:34px}
.item .t{font-weight:500}
.item .d{font-size:13px;color:var(--muted);margin-left:auto}
article{padding:64px 0 12px;border-bottom:1px solid var(--line)}
.meta{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
h2{font-size:27px;margin:10px 0 12px;letter-spacing:-.01em;line-height:1.3}
.lede{font-size:18px;font-weight:500;margin:0 0 22px;line-height:1.5}
p{margin:0 0 16px}
ul{margin:0 0 18px;padding-left:20px}
li{margin-bottom:7px}
code{background:var(--code);padding:1px 5px;border-radius:4px;font-size:.9em}
pre{background:var(--code);padding:14px;border-radius:8px;overflow-x:auto}
pre code{background:none;padding:0}
.back{display:inline-block;color:var(--muted);text-decoration:none;font-size:14px;padding:8px 0}
.back:hover{color:var(--ink)}
footer{padding:48px 0 0;color:var(--muted);font-size:14px}
@media(max-width:520px){.title{font-size:33px}header{padding-top:64px}body{font-size:16px}article{padding-top:48px}}