:root{
  color-scheme:dark;
  --bg:#07090f;--line:rgba(255,255,255,0.09);--line-2:rgba(255,255,255,0.16);
  --text:#f2f5fb;--muted:#8b96ab;--accent:#3b82f6;--accent-2:#22c55e;
}
*{box-sizing:border-box}
body{
  margin:0;background:var(--bg);color:var(--text);line-height:1.7;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:#93c5fd}
.bar{border-bottom:1px solid var(--line);background:rgba(11,15,24,.6)}
.bar-in{max-width:860px;margin:0 auto;padding:0 28px;display:flex;align-items:center;height:70px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none;color:var(--text)}
.mark{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:.8rem;
  font-weight:800;color:#04070d;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
main{max-width:860px;margin:0 auto;padding:64px 28px 96px}
.kicker{font-size:.78rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px}
h1{font-size:clamp(2rem,4vw,2.9rem);letter-spacing:-.04em;line-height:1.1;margin:0 0 12px;font-weight:800}
.updated{color:var(--muted);font-size:.92rem;margin:0 0 14px}
h2{font-size:1.3rem;letter-spacing:-.02em;margin:52px 0 14px;font-weight:700;
  padding-top:26px;border-top:1px solid var(--line)}
h2:first-of-type{border-top:0;padding-top:0;margin-top:40px}
h3{font-size:1.02rem;margin:26px 0 8px;font-weight:650}
p{margin:0 0 16px;color:#c3ccdb}
ul,ol{margin:0 0 16px;padding-left:22px;color:#c3ccdb}
li{margin-bottom:9px}
.toc{border:1px solid var(--line);border-radius:16px;padding:24px 28px;margin:0 0 48px;
  background:rgba(255,255,255,.03)}
.toc h2{margin:0 0 12px;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);border:0;padding:0;font-weight:700}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:32px}
.toc li{margin-bottom:6px;font-size:.93rem;break-inside:avoid}
.toc a{text-decoration:none;color:#c3ccdb}
.toc a:hover{color:var(--text);text-decoration:underline}
.foot{border-top:1px solid var(--line);margin-top:64px;padding-top:28px;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  color:var(--muted);font-size:.88rem}
.foot a{color:var(--muted);text-decoration:none;margin-left:18px}
.foot a:hover{color:var(--text)}
@media (max-width:640px){ .toc ol{columns:1} }