:root{
  --bg:#000; --bg-soft:#141922; --card:#171d27; --line:#242c39;
  --text:#e9edf4; --muted:#9aa6b8; --accent:#3b8cff;
}
*{box-sizing:border-box}
body{
  position:relative;margin:0;background:var(--bg);color:var(--text);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;
}
::selection{background:var(--accent);color:#0e1116}
.wrap{max-width:740px;margin:0 auto;padding:0 24px}
header{border-bottom:1px solid var(--line);background:rgba(0,0,0,.9);backdrop-filter:blur(14px);position:sticky;top:0;z-index:5}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;text-decoration:none;color:var(--text);letter-spacing:-.01em}
.brand img{width:26px;height:26px;object-fit:contain;mix-blend-mode:screen}
.back{color:var(--muted);text-decoration:none;font-size:15px}
.back:hover{color:var(--text)}
main{padding:64px 0 96px}
h1{font-family:"Instrument Serif",Georgia,serif;font-weight:400;font-size:clamp(2.1rem,5vw,3rem);letter-spacing:-.02em;margin:0 0 10px}
.sub{color:var(--muted);margin:0 0 48px;font-size:15px}
h2{font-size:1.1rem;letter-spacing:-.01em;margin:40px 0 10px;padding-top:24px;border-top:1px solid var(--line)}
h2:first-of-type{border-top:0;padding-top:0;margin-top:0}
h3{font-size:1rem;margin:24px 0 6px}
p,li{color:var(--muted)}
p{margin:0 0 14px}
ul{padding-left:20px;margin:0 0 14px}
li{margin-bottom:6px}
a{color:var(--accent)}
.todo{
  display:inline-block;background:rgba(255,211,77,.12);border:1px dashed #ffd34d;
  color:#ffd34d;border-radius:6px;padding:1px 8px;font-size:14px;font-weight:600;
}
.note{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:0 0 40px}
.note p{margin:0;font-size:15.5px}
footer{border-top:1px solid var(--line);padding:28px 0;font-size:14px;color:var(--muted)}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--text)}
.foot{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between}
@media (max-width:600px){body{font-size:16px}main{padding:44px 0 72px}}

body::before{
  content:"";position:absolute;top:68px;left:0;right:0;height:640px;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 62% 70% at 0% 0%,rgba(8,102,214,.80) 0%,rgba(8,72,160,.42) 38%,transparent 72%),
    radial-gradient(ellipse 46% 66% at 100% 0%,rgba(146,72,196,.70) 0%,rgba(110,54,160,.35) 40%,transparent 72%);
  -webkit-mask:linear-gradient(180deg,#000 55%,transparent 100%);mask:linear-gradient(180deg,#000 55%,transparent 100%);
}