:root{--ink:#242729;--muted:#92989c;--sans:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color-scheme:light}
*{box-sizing:border-box}
body{margin:0;background:#fff;color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a,button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible{outline:2px solid #748986;outline-offset:6px}
[hidden]{display:none!important}
html[data-language=zh] [data-article-language=en],html[data-language=en] [data-article-language=zh]{display:none}
.skip-link{position:fixed;z-index:10;top:12px;left:16px;padding:10px 14px;background:#f3f5f4;transform:translateY(-180%)}
.skip-link:focus{transform:none}
.reading-nav,.reading-main{width:min(780px,calc(100% - 64px));margin-inline:auto}
.reading-nav{display:flex;align-items:center;justify-content:space-between;padding-top:26px;min-height:70px;color:#80878b;font-size:13px}
.reading-back{display:inline-flex;align-items:center;min-height:44px}
.language-toggle{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px 0;border:0;background:none;color:inherit;font:400 13px/1.4 var(--sans);cursor:pointer;text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1px}
.reading-main{padding:54px 0 80px}
.article-heading h1{margin:0;font:600 clamp(32px,4.1vw,52px)/1.22 var(--sans);letter-spacing:-.025em;overflow-wrap:anywhere;text-wrap:pretty}
.article-date{display:block;margin-top:20px;color:#a0a5a8;font-size:15px;line-height:1.7;font-variant-numeric:tabular-nums}
.article-body{margin-top:64px;font:400 18px/1.95 var(--sans);color:#52595d;overflow-wrap:anywhere}
.article-body [lang=en]{line-height:1.85}
.article-body p{margin:0 0 1.4em}
.article-body h2{margin:2.1em 0 .85em;font-size:27px;font-weight:550;line-height:1.45;color:var(--ink);letter-spacing:-.015em}
.article-body h3{margin:1.8em 0 .75em;font-size:21px;font-weight:550;line-height:1.5;color:var(--ink)}
.article-body h4{margin:1.6em 0 .7em;font-size:19px;font-weight:550;color:var(--ink)}
.article-body strong{font-weight:600;color:#3d4448}
.article-body a{text-decoration:underline;text-decoration-color:#c9cecf;text-decoration-thickness:1px;text-underline-offset:4px}
.article-body a:hover{text-decoration-color:currentColor}
.article-body img{display:block;max-width:100%;height:auto;margin:30px auto}
.article-body blockquote{margin:30px 0;padding:0 0 0 23px;border-left:2px solid #e4e8e7;color:#697176}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body [data-article-language=zh] q{quotes:"“" "”" "‘" "’"}
.article-body ul,.article-body ol{margin:0 0 1.4em;padding-left:1.5em}
.article-body li{margin:.45em 0}
.article-body code{padding:.1em .3em;background:#f5f6f5;border-radius:3px;font:400 .88em/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;color:#3b4144}
.article-body pre{padding:20px;background:#f6f7f6;border-radius:4px;overflow-x:auto;white-space:pre-wrap;tab-size:2}
.article-body pre code{padding:0;background:none}
.article-body hr{margin:42px 0;border:0;border-top:1px solid #e8ebea}
.article-body table{display:block;width:100%;overflow:auto;border-collapse:collapse;margin:25px 0;font-size:15px}
.article-body th,.article-body td{padding:10px 14px;border:1px solid #e3e7e5;text-align:left}
.article-media-link{font-size:14px;color:#8a9295}
.article-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:18px;margin-top:64px;padding-top:25px;border-top:1px solid #edf0ee;color:#9aa1a4;font-size:12px;line-height:1.8}
.article-footer a:hover,.reading-back:hover{color:#343d40}
@media(max-width:700px){
  .reading-nav,.reading-main{width:calc(100% - 44px)}
  .reading-nav{padding-top:14px;min-height:58px}
  .reading-main{padding:36px 0 52px}
  .article-heading h1{font-size:32px;line-height:1.3;letter-spacing:-.02em}
  .article-date{margin-top:16px;font-size:13px}
  .article-body{margin-top:42px;font-size:16px;line-height:1.95}
  .article-body [lang=en]{line-height:1.85}
  .article-body h2{font-size:24px}
  .article-body h3{font-size:20px}
  .article-body blockquote{padding-left:16px}
  .article-body pre{padding:15px;font-size:14px}
  .article-footer{margin-top:46px;font-size:11px}
}