:root{
--bg:#f8fafc;
    --card:#ffffff;
    --text:#0f172a;
    --muted:#475569;
    --border:#e2e8f0;
    --accent:#2563eb;
    --link:#1d4ed8;
    --code:#f1f5f9;
}
/*@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b0f19;
  --card:#111827;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --border:#1f2937;
  --accent:#60a5fa;
  --link:#93c5fd;
  --code:#0f172a;
  }
}*/
*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}
header{
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, rgba(96,165,250,.14), transparent);
}
.wrap{
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 16px;
}
.title{
  margin: 8px 0 4px;
  font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing:-.02em;
}
.meta{
  margin:0;
  color:var(--muted);
  font-size: 14px;
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}
main .card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:16px;
  padding: 20px;
  margin: 18px 0;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
h2{
  margin: 22px 0 10px;
  font-size: 22px;
}
h3{
  margin: 16px 0 8px;
  font-size: 18px;
}
h4{
  margin: 14px 0 6px;
  font-size: 16px;
  color: var(--text);
}
p{margin: 10px 0}
ul{margin: 8px 0 8px 20px}
li{margin: 6px 0}
a{color:var(--link)}
a:hover{opacity:.9}
.badge{
  display:inline-block;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  margin-left: 6px;
  vertical-align: middle;
}
.note{
  border-left: 4px solid var(--accent);
  background: rgba(96,165,250,.08);
  padding: 12px 14px;
  border-radius: 10px;
  color: var(--text);
}
code{
  background: var(--code);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: .95em;
}
footer{
  border-top:1px solid var(--border);
  color:var(--muted);
  padding: 18px 0 28px;
  font-size: 13px;
}