:root{
  --ink:#111827; --sub:#6b7280; --line:#e6e8ee; --sea:#2f6fd0;
  --bg:#ffffff; --soft:#f7f9fc;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:16px/1.85 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
a{color:var(--sea);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{
  max-width:720px;margin:0 auto;padding:28px 22px 18px;
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
}
.brand{font-weight:600;color:var(--ink);font-size:17px}
.site-header nav a{color:var(--sub);margin-left:18px;font-size:14px}
main{max-width:720px;margin:0 auto;padding:8px 22px 40px}
.intro{padding:14px 0 6px}
.intro h1{font-size:30px;margin:0 0 6px;letter-spacing:-.01em}
.intro p{color:var(--sub);margin:0}
.page-title{font-size:24px;margin:18px 0 6px}
.post-list{list-style:none;padding:0;margin:18px 0 0}
.post-list li{padding:16px 0;border-top:1px solid var(--line)}
.post-list li:first-child{border-top:0}
.post-list a{font-size:17px;font-weight:550}
.post-list time{display:block;color:var(--sub);font-size:13px;margin-top:2px;font-variant-numeric:tabular-nums}
.excerpt{margin:6px 0 0;color:var(--sub);font-size:14px}
article h1{font-size:28px;line-height:1.35;margin:10px 0 8px}
.meta{color:var(--sub);font-size:13px;margin:0 0 24px}
.content p{margin:1.1em 0}
.content h2{font-size:20px;margin:1.8em 0 .6em}
.content h3{font-size:17px;margin:1.5em 0 .5em}
.content ul,.content ol{padding-left:1.3em}
.content li{margin:.35em 0}
.content blockquote{
  margin:1.2em 0;padding:.2em 0 .2em 1em;border-left:3px solid var(--line);color:var(--sub);
}
.content code{
  background:var(--soft);border:1px solid var(--line);border-radius:4px;
  padding:.1em .35em;font-size:.9em;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
.content pre{
  background:var(--soft);border:1px solid var(--line);border-radius:8px;
  padding:14px 16px;overflow:auto;
}
.content pre code{background:none;border:0;padding:0}
.content img{max-width:100%;border-radius:8px}
.back{margin-top:36px;font-size:14px}
.site-footer{
  max-width:720px;margin:0 auto;padding:22px;border-top:1px solid var(--line);
  color:var(--sub);font-size:12.5px;text-align:center;
}
.site-footer a{color:var(--sub)}
@media (max-width:520px){
  .site-header{flex-direction:column;align-items:flex-start;gap:8px}
  .site-header nav a{margin-left:0;margin-right:16px}
  .intro h1{font-size:25px}
}