:root{
  --bg:#ffffff; --fg:#16181d; --muted:#5c636e; --line:#e4e7ec;
  --accent:#1a56db; --panel:#f7f8fa;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#101216; --fg:#e8eaee; --muted:#9aa2ae; --line:#262b33;
         --accent:#6b93f5; --panel:#171a20; }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
.wrap{max-width:720px;margin:0 auto;padding:0 20px}
.site-head{border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px}
.brand{font-weight:700;font-size:18px;text-decoration:none;color:var(--fg);letter-spacing:-.01em}
nav a{margin-left:18px;text-decoration:none;color:var(--muted);font-size:15px}
nav a:hover{color:var(--accent)}
main{padding:44px 20px 64px}
h1{font-size:30px;line-height:1.25;margin:0 0 16px;letter-spacing:-.02em}
h2{font-size:20px;line-height:1.35;margin:36px 0 12px;letter-spacing:-.01em}
h3{font-size:16px;margin:24px 0 8px}
p{margin:0 0 16px}
ul{margin:0 0 16px;padding-left:22px}
li{margin-bottom:7px}
a{color:var(--accent)}
.lead{font-size:18px;color:var(--muted)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px;margin:0 0 16px}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
.meta{color:var(--muted);font-size:14px}
.site-foot{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:14px}
.foot-inner{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;padding:0 20px}
.foot-inner p{margin:0}
.site-foot a{color:var(--muted)}
@media(max-width:520px){ h1{font-size:25px} main{padding-top:32px} }