* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

.header {
  position: sticky;
  top: 0;
  background: #fff;
}

.nav {
  display: flex;
  justify-content: space-between;
  padding: 15px;
}

.nav ul {
  display: flex;
  gap: 15px;
}

.nav a.active {
  color: red;
}

.hero {
  min-height: 100vh;
  display: grid;
  place-content: center;
  text-align: center;
  background: linear-gradient(120deg, #667eea, #764ba2);
  color: white;
}

.cta {
  padding: 10px 20px;
  margin-top: 20px;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 50px;
  gap: 20px;
}

.card {
  background: #eee;
  padding: 40px;
  text-align: center;
  transition: transform 0.3s;
}

.card:hover {
  transform: rotateY(10deg) scale(1.05);
}

.testimonial {
  padding: 50px;
}