:root {
  --black: #0a0a0a;
  --green: #39ff14;
  --silver: #a0a0a0;
  --darkgray: #1c1c1c;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: 'Rajdhani', sans-serif;
  background: var(--black);
  color: #fff;
  line-height: 1.6;
}
header {
  background: linear-gradient(rgba(0,0,0,0.9), rgba(0,0,0,0.95)),
              url('https://images.unsplash.com/photo-1603584173870-7f23fdae1b7a?ixlib=rb-4.0.3&auto=format&fit=crop&q=80') center/cover no-repeat fixed;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}
.logo-img {
  width: 580px;
  max-width: 96vw;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 0 50px rgba(57,255,20,0.9)) drop-shadow(0 0 100px rgba(57,255,20,0.5));
  animation: pulse 5s infinite alternate;
}
@keyframes pulse {
  from { filter: drop-shadow(0 0 50px rgba(57,255,20,0.9)) drop-shadow(0 0 100px rgba(57,255,20,0.5)); }
  to   { filter: drop-shadow(0 0 70px rgba(57,255,20,1)) drop-shadow(0 0 140px rgba(57,255,20,0.8)); }
}
header h1 { font-size: 3.5rem; margin: 1rem 0; color: var(--green); text-shadow: 0 0 20px rgba(57,255,20,0.6); }
header p { font-size: 1.6rem; max-width: 800px; }
.btn {
  display: inline-block;
  background: var(--green);
  color: #000;
  padding: 1.2rem 3rem;
  font-weight: bold;
  font-size: 1.4rem;
  border-radius: 50px;
  text-decoration: none;
  margin-top: 2rem;
  box-shadow: 0 0 30px rgba(57,255,20,0.5);
  transition: all 0.3s;
}
.btn:hover { transform: scale(1.1); box-shadow: 0 0 50px rgba(57,255,20,0.8); }

nav {
  background: rgba(10,10,10,0.95);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}
nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 1.5rem 0;
}
nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 2rem;
  font-size: 1.3rem;
  font-weight: bold;
  position: relative;
}
nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 3px;
  background: var(--green);
  bottom: -8px;
  left: 0;
  transition: 0.3s;
}
nav a:hover::after { width: 100%; }

section { padding: 5rem 2rem; text-align:center; }
h2 {
  font-family: 'Orbitron', sans-serif;
  font-size: 3.5rem;
  color: var(--green);
  margin-bottom: 3rem;
  text-shadow: 0 0 20px rgba(57,255,20,0.4);
}
h3 {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  color: var(--green);
  margin: 4rem 0 2rem;
  text-shadow: 0 0 20px rgba(57,255,20,0.4);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px,1fr));
  gap: 2rem;
  max-width: 1300px;
  margin: 0 auto;
}
.card {
  background: var(--darkgray);
  border: 2px solid var(--silver);
  border-radius: 15px;
  padding: 2rem;
  transition: 0.4s;
}
.card:hover { border-color: var(--green); transform: translateY(-15px); box-shadow: 0 0 30px rgba(57,255,20,0.3); }
.card h3 { color: var(--green); font-size: 1.8rem; margin-bottom: 1rem; }

footer {
  background: #000;
  padding: 3rem;
  text-align: center;
  border-top: 2px solid var(--green);
}
footer a { color: var(--green); text-decoration: none; }

@media (max-width: 768px) {
  .logo-img { width: 380px; }
  header h1 { font-size: 2.5rem; }
  nav ul { flex-direction: column; }
  nav a { margin: 0.8rem 0; }
}