body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: #0f172a;
  color: white;
}

.header {
  position: fixed;
  width: 100%;
  background: rgba(0,0,0,0.7);
  padding: 15px 30px;
}

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  color: #38bdf8;
}

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

.btn-nav {
  background: #38bdf8;
  padding: 8px 15px;
  border-radius: 20px;
}

.hero {
  height: 100vh;
  background: url('https://images.unsplash.com/photo-1551288049-bebda4e38f71') center/cover;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
}

.hero-content {
  position: relative;
  text-align: center;
}

.btn-primary {
  background: #38bdf8;
  padding: 12px 25px;
  border-radius: 30px;
  color: black;
  text-decoration: none;
}

.section {
  padding: 80px 20px;
  text-align: center;
}

.dark {
  background: #020617;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px,1fr));
  gap: 20px;
}

.card {
  background: #1e293b;
  padding: 20px;
  border-radius: 10px;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-10px);
}

.whatsapp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25D366;
  padding: 15px;
  border-radius: 50%;
  color: white;
  text-decoration: none;
}