:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --accent:#147a8a;
  --glow:#f7ff00;
}

[data-theme="blade"]{
  --bg:#0b0f19;
  --card:#111827;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --line:#1f2937;
  --accent:#00f0ff;
  --glow:#ff00c8;
}

body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  transition:all .3s ease;
}

.container{max-width:1100px;margin:0 auto;padding:40px 24px 80px}

.topnav{
  position:sticky;top:0;
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 24px;
  backdrop-filter:blur(8px);
  background:rgba(255,255,255,.75);
  border-bottom:1px solid var(--line);
}
[data-theme="blade"] .topnav{
  background:rgba(10,15,25,.85);
}

.brand{font-weight:800;letter-spacing:.5px}

.navlinks a{
  margin:0 10px;
  text-decoration:none;
  color:var(--muted);
  font-weight:600;
}
.navlinks a:hover{color:var(--accent)}

.theme-toggle{
  cursor:pointer;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--card);
  font-size:12px;
  font-weight:700;
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:22px;
  padding:32px;
  margin-bottom:28px;
  box-shadow:0 20px 40px rgba(0,0,0,.05);
  transition:all .3s ease;
}

[data-theme="blade"] .card{
  box-shadow:0 0 30px rgba(0,240,255,.08),
             0 0 60px rgba(255,0,200,.05);
}

h1{
  font-size:34px;
  margin-top:0;
}

.footer{
  padding:60px 24px 50px;
  border-top:1px solid var(--line);
  margin-top:100px;
  font-size:13px;
  color:var(--muted);
}

.footergrid{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:20px;
}

@media(max-width:900px){
  .footergrid{grid-template-columns:1fr}
}

.glow{
  color:var(--accent);
  text-shadow:0 0 10px var(--glow);
}