:root{
  --ground:#f6f7f9; --surface:#fff; --ink:#151a24; --muted:#5d6675;
  --line:rgba(21,26,36,.12); --accent:#3f7fcf;
}
@media (prefers-color-scheme:dark){
  :root{--ground:#0f1216;--surface:#171b22;--ink:#e6e9ef;--muted:#99a1b0;
        --line:rgba(230,233,239,.14);--accent:#74b0f5;}
}
*{box-sizing:border-box}
body{margin:0;background:var(--ground);color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  padding:0 20px 72px}
.wrap{max-width:720px;margin:0 auto}
header{display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;padding:26px 0 18px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:18px;letter-spacing:-.01em;text-decoration:none;color:var(--ink)}
.brand span{color:var(--accent)}
nav{display:flex;gap:18px;flex-wrap:wrap}
nav a{color:var(--muted);text-decoration:none;font-size:14px}
nav a:hover,nav a:focus{color:var(--accent)}
h1{font-size:clamp(26px,5vw,34px);line-height:1.15;letter-spacing:-.02em;
  margin:36px 0 10px;text-wrap:balance}
h2{font-size:19px;margin:34px 0 10px;letter-spacing:-.01em}
h3{font-size:16px;margin:22px 0 6px}
p,li{color:var(--muted)}
p{margin:0 0 14px}
ul{margin:0 0 14px;padding-left:20px}
li{margin-bottom:6px}
strong{color:var(--ink);font-weight:600}
a{color:var(--accent)}
.updated{font-size:13px;color:var(--muted);margin-bottom:26px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;
  padding:20px 22px;margin:22px 0}
.card p:last-child{margin-bottom:0}
footer{margin-top:52px;padding-top:20px;border-top:1px solid var(--line);
  font-size:13px;color:var(--muted)}
footer a{color:var(--muted)}