/* ====== Dark Neon Theme (revamped) ====== */
:root{
  --bg:#0b0f17;
  --surface:#101827;
  --surface-2:#121c2e;
  --text:#e6ebff;
  --muted:#aab4d4;
  --primary:#7aa2ff;
  --accent:#8b5cf6;
  --success:#22c55e;
  --warning:#f59e0b;
  --danger:#ef4444;
  --border:#20324d;
  --radius:16px;
  --shadow:0 10px 28px rgba(0,0,0,.45);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background: radial-gradient(1200px 700px at 10% -10%, rgba(123,74,226,.12), transparent 60%),
              radial-gradient(1200px 700px at 110% 110%, rgba(32,122,255,.10), transparent 60%),
              var(--bg);
  color:var(--text);
  font-family: Inter, system-ui, Segoe UI, Roboto, Arial, Helvetica, sans-serif;
  line-height:1.7;
}

/* Header & Nav */
header{
  position:sticky; top:0; z-index:50;
  background: rgba(12,18,30,0.75);
  backdrop-filter: saturate(130%) blur(12px);
  border-bottom:1px solid var(--border);
}
.header-wrap{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:14px 20px}
.logo img{height:40px;width:auto;display:block;filter:drop-shadow(0 2px 8px rgba(0,0,0,.35));}

nav ul{list-style:none;display:flex;gap:12px;margin:0;padding:0;flex-wrap:wrap}
nav a{
  display:inline-block;padding:10px 14px;border:1px solid transparent;border-radius:999px;
  color:var(--text); opacity:.9; text-decoration:none;
}
nav a:hover{background:var(--surface-2);border-color:var(--border);opacity:1}

/* Hero carousel */
.carousel{max-width:1350px;margin:20px auto 0;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--border)}
.carousel-track{display:flex;gap:0;overflow:hidden}
.carousel-track img{display:none;max-height:650px;width:100%;object-fit:cover}
.carousel-track img.active{display:block}

/* Layout */
.container{max-width:1200px;margin:24px auto;padding:0 16px;display:grid;grid-template-columns:280px 1fr;gap:24px}
.sidebar{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.sidebar h3{margin-top:0}
.sidebar p{color:var(--muted)}

.stack{display:grid;gap:10px}
.goto-button{
  display:block;width:100%;
  padding:12px 16px;border-radius:12px;
  background: linear-gradient(90deg,var(--primary),var(--accent));
  color:white;font-weight:800;text-align:center;text-decoration:none;
  box-shadow: 0 6px 16px rgba(122,162,255,.25);
  transition: transform .08s ease, filter .2s ease;
}
.goto-button:hover{transform:translateY(-1px);filter:saturate(110%)}

main{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
main h1{margin-top:0;letter-spacing:.2px}
section{background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:18px;margin:18px 0}
section h2{margin-top:0}

.cta-center{display:flex;justify-content:center;align-items:center;margin:28px 0}
.btn-register{
  display:inline-block;padding:14px 22px;border-radius:999px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  color:#fff;font-weight:800;letter-spacing:.3px;text-transform:uppercase;box-shadow:0 10px 24px rgba(139,92,246,.25);
  text-decoration:none;
}
.btn-register:hover{filter:saturate(115%)}

/* Tables */
table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);
  border-radius:12px;overflow:hidden}
th,td{border-bottom:1px solid var(--border);padding:12px 10px;text-align:left}
th{background:#1b2333;font-weight:800}
tr:hover td{background:rgba(122,162,255,0.06)}

/* Footer */
footer{border-top:1px solid var(--border);padding:28px 16px;background:#0e121a;margin-top:32px}
.footer-content{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px}
.footer-logo img{height:28px;filter:grayscale(10%) brightness(110%)}

/* Responsive */
@media (max-width: 1024px){
  .container{grid-template-columns:1fr}
  .sidebar{order:2}
  main{order:1}
}