:root{
  --bg:#0b0f1a;
  --card:#101a2b;
  --text:#e8eefc;
  --muted:#b7c4e6;
  --link:#8ab4ff;
  --border:rgba(255,255,255,.12);
  --accent:rgba(138,180,255,.18);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;
  --max: 980px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 20% 0%, rgba(138,180,255,.20), transparent 55%),
              radial-gradient(1200px 600px at 85% 10%, rgba(170, 120, 255, .18), transparent 60%),
              var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:var(--link); text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:var(--max); margin:0 auto}
header{padding:42px 18px 18px}

.badge{
  display:inline-flex; align-items:center; gap:10px;
  padding:10px 14px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.04);
  border-radius:999px;
  font-size:.92rem;
  color:var(--muted);
}

.hero{
  margin-top:18px;
  padding:22px 18px;
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.topbar{
  display:flex; gap:12px; align-items:center; justify-content:space-between;
  padding:12px 0 0;
  border-top:1px solid var(--border);
  margin-top:22px;
  flex-wrap:wrap;
}

h1{font-size:2.1rem; line-height:1.2; margin:0 0 12px}
.sub{color:var(--muted); margin:0 0 6px}

nav.toc{
  margin-top:14px;
  display:flex; flex-wrap:wrap; gap:10px;
}
nav.toc a{
  display:inline-block;
  padding:9px 12px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  border-radius:999px;
  font-size:.95rem;
}

main{padding:18px 18px 70px}
section{
  margin-top:18px;
  padding:18px;
  background:rgba(255,255,255,.03);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:0 6px 18px rgba(0,0,0,.22);
}
h2{margin:0 0 10px; font-size:1.45rem}
h3{margin:16px 0 8px; font-size:1.10rem; color:var(--text)}
p{margin:10px 0; color:var(--text)}
ul{margin:10px 0 0 20px}
li{margin:6px 0; color:var(--text)}

.grid{
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap:12px;
  margin-top:12px;
}
.card{
  grid-column: span 6;
  padding:14px 14px;
  border:1px solid var(--border);
  border-radius:16px;
  background:rgba(0,0,0,.14);
}
.card p{color:var(--muted); margin:8px 0 0}

.kicker{
  display:inline-block;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--accent);
  color:var(--text);
  font-size:.85rem;
}

.note{
  margin-top:10px;
  padding:12px 14px;
  border:1px solid var(--border);
  border-radius:14px;
  background:rgba(255,255,255,.035);
  color:var(--muted);
  font-size:.95rem;
}

.cta{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:12px;
}
.btn{
  display:inline-block;
  padding:10px 14px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.05);
  color:var(--text);
  font-weight:600;
}
.btn.primary{
  background:rgba(138,180,255,.18);
  border-color:rgba(138,180,255,.35);
}

details{
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px 14px;
  background:rgba(0,0,0,.12);
  margin-top:10px;
}
summary{cursor:pointer; font-weight:700}

footer{
  padding:26px 18px 42px;
  border-top:1px solid var(--border);
  color:var(--muted);
}
.small{font-size:.92rem; color:var(--muted)}
.mini{font-size:.85rem; color:var(--muted)}

.two{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:12px;
  margin-top:12px;
}

.skip{
  position:absolute; left:-9999px; top:auto;
  width:1px; height:1px; overflow:hidden;
}
.skip:focus{
  position:static; width:auto; height:auto;
  padding:10px 12px; display:inline-block;
  background:rgba(138,180,255,.18);
  border:1px solid rgba(138,180,255,.35);
  border-radius:12px;
  margin:10px;
}

@media (max-width: 860px){
  .card{grid-column: span 12}
  .two{grid-template-columns: 1fr}
  h1{font-size:1.8rem}
}