:root{
  --bg:#03040A;
  --panel:#080a12;
  --line:#151a26;
  --ink:#E7EEFB;
  --muted:#8592ab;
  --glow:#2F7BFF;
  --glow-soft:#EAF6FF;
  --maxw:720px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.7;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--glow);text-decoration:none}
a:hover{text-decoration:underline}

/* top bar */
.nav{
  border-bottom:1px solid var(--line);
  position:sticky;top:0;
  background:rgba(3,4,10,.82);
  backdrop-filter:saturate(120%) blur(8px);
  z-index:5;
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:18px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em;color:var(--ink)}
.brand:hover{text-decoration:none}
.mark{
  width:14px;height:14px;border-radius:50%;
  background:radial-gradient(circle at 50% 40%,var(--glow-soft),var(--glow) 55%,transparent 72%);
  box-shadow:0 0 14px 2px rgba(47,123,255,.65);
}
.nav a.small{color:var(--muted);font-size:14px;font-weight:500}
.nav a.small:hover{color:var(--ink);text-decoration:none}

/* layout */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
main.doc{padding:56px 0 96px}
.updated{color:var(--muted);font-size:14px;margin:0 0 40px}
footer{
  border-top:1px solid var(--line);color:var(--muted);font-size:14px;
  padding:34px 0 60px;
}
footer .wrap{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;align-items:center}
footer a{color:var(--muted)}
footer a:hover{color:var(--ink)}

/* type */
h1{font-size:34px;line-height:1.2;letter-spacing:-.01em;margin:0 0 10px}
h2{font-size:21px;margin:44px 0 12px;letter-spacing:-.005em}
h3{font-size:17px;margin:26px 0 8px;color:var(--glow-soft)}
p,li{color:#cdd6e6}
strong{color:var(--ink)}
ul{padding-left:22px;margin:12px 0}
li{margin:6px 0}
hr{border:none;border-top:1px solid var(--line);margin:40px 0}
.lead{font-size:18px;color:#cdd6e6}

/* hero (landing) */
.hero{padding:110px 0 90px;position:relative;overflow:hidden}
.hero:before{
  content:"";position:absolute;left:50%;top:0;transform:translateX(-50%);
  width:2px;height:100%;
  background:linear-gradient(to bottom,transparent,rgba(47,123,255,.55),transparent);
  box-shadow:0 0 22px 3px rgba(47,123,255,.35);opacity:.5;
}
.hero .wrap{position:relative;text-align:center}
.hero h1{font-size:44px;margin-bottom:14px}
.hero p{max-width:34ch;margin:0 auto 34px;color:var(--muted);font-size:19px}
.links{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-block;padding:12px 22px;border-radius:12px;
  border:1px solid var(--line);color:var(--ink);font-weight:600;font-size:15px;
}
.btn:hover{border-color:var(--glow);text-decoration:none}
.btn.primary{background:var(--glow);border-color:var(--glow);color:#fff}
.btn.primary:hover{filter:brightness(1.08)}

@media (max-width:520px){
  h1{font-size:28px}.hero h1{font-size:34px}body{font-size:16px}
}