:root {
  --bg: #0b0d12;
  --panel: #111520;
  --surface: #0f131c;
  --text: #e8edf7;
  --muted: #a9b3c7;
  --line: rgba(255,255,255,.10);
  --brand: #7aa2ff;
  --brand2: #9a7dff;
  --link: #9bb8ff;
  --shadow: 0 16px 40px rgba(0,0,0,.35);
  --radius: 14px;
  --radius2: 10px;
  --max: 1040px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 25% 0%, rgba(122,162,255,.15), transparent 60%),
    radial-gradient(900px 600px at 85% 10%, rgba(154,125,255,.10), transparent 55%),
    linear-gradient(180deg, #07080c, var(--bg));
  line-height:1.55;
}

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

.container{max-width:var(--max); margin:0 auto; padding:26px 18px 64px}

/* Top nav */
.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(11,13,18,.72);
  border-bottom: 1px solid var(--line);
}
.topbar-inner{max-width:var(--max); margin:0 auto; padding:14px 18px; display:flex; align-items:center; justify-content:space-between; gap:14px}
.brand{display:flex; align-items:center; gap:10px; font-weight:800; letter-spacing:.2px}
.brand-badge{width:28px; height:28px; border-radius:9px; box-shadow: var(--shadow)}
.brand span{color:var(--text)}

.nav{display:flex; align-items:center; gap:8px; flex-wrap:wrap}
.nav a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  border-radius: 10px;
  color: var(--muted);
  border: 1px solid transparent;
}
.nav a:hover{color:var(--text); border-color: var(--line); background: rgba(255,255,255,.04)}
.nav a.active{color:var(--text); border-color: rgba(122,162,255,.35); background: rgba(122,162,255,.10)}

.hero{
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17,21,32,.85), rgba(17,21,32,.60));
  box-shadow: var(--shadow);
}
.hero h1{margin:0 0 6px; font-size:26px; letter-spacing:.2px}
.hero p{margin:0; color: var(--muted)}

.card{
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(17,21,32,.55);
}

.grid{display:grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 14px}
.tile{padding:14px; border:1px solid var(--line); border-radius: var(--radius); background: rgba(15,19,28,.55)}
.tile h2{margin:0 0 6px; font-size:15px}
.tile p{margin:0; color: var(--muted)}

.meta{color:var(--muted); font-size:13px}

h2{margin:18px 0 8px; font-size:16px}
h3{margin:14px 0 6px; font-size:14px}

p,li{color: var(--muted)}
ul{margin: 8px 0 0 18px}

hr{border:0; border-top:1px solid var(--line); margin:16px 0}

code{font-family: var(--mono); font-size: 12.5px; background: rgba(255,255,255,.08); padding: 2px 6px; border-radius: 8px; color: var(--text)}

.callout{
  border: 1px solid rgba(122,162,255,.30);
  background: rgba(122,162,255,.09);
  padding: 12px;
  border-radius: var(--radius2);
  color: var(--text);
}
.callout p{margin:0; color: var(--text)}

.footer{margin-top: 18px; color: var(--muted); font-size: 13px}

@media (max-width: 680px){
  .topbar-inner{flex-direction:column; align-items:flex-start}
}