body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  background: #0e0e0e;
  color: #fff;
}

header {
  display: flex;
  justify-content: space-between;
  padding: 20px 40px;
  background: rgba(20,20,20,0.9);
  position: sticky;
  top: 0;
}

header .logo {
  font-size: 20px;
  font-weight: bold;
}

nav a {
  margin: 0 10px;
  color: #aaa;
  text-decoration: none;
}

nav a.active, nav a:hover {
  color: #fff;
}

.hero {
  text-align: center;
  padding: 120px 20px;
  background: linear-gradient(135deg, #1a1a1a, #222, #1a1a1a);
}

.hero h1 {
  font-size: 42px;
}

.hero .btn {
  margin-top: 20px;
  display: inline-block;
  padding: 12px 24px;
  background: #06f;
  border-radius: 6px;
  color: #fff;
  text-decoration: none;
}

.features .grid,
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  padding: 40px;
}

.card {
  background: #1c1c1c;
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

footer {
  text-align: center;
  padding: 20px;
  background: #111;
  color: #666;
}