body {
  margin:0;
  font-family:'Poppins', sans-serif;
  background:#f5f5f5;
  color:#333;
}

.hero {
  height:90vh;
  background:linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)),
  url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f');
  background-size:cover;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  color:#fff;
}

.overlay h1 {
  font-size:3em;
}

.btn {
  display:inline-block;
  margin-top:20px;
  padding:12px 25px;
  background:#fff;
  color:#000;
  text-decoration:none;
  border-radius:30px;
}

nav {
  background:#111;
  padding:15px;
  text-align:center;
}
nav a {
  color:#fff;
  margin:0 15px;
  text-decoration:none;
}

.section {
  padding:60px 20px;
  max-width:1100px;
  margin:auto;
}

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

.card {
  background:#fff;
  padding:30px;
  border-radius:15px;
  box-shadow:0 5px 20px rgba(0,0,0,0.1);
  transition:0.3s;
}
.card:hover {
  transform:translateY(-5px);
}

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