body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #1f4037, #99f2c8);
  color: #fff;
  animation: backgroundFade 20s infinite alternate;
}

@keyframes backgroundFade {
  0% { background: linear-gradient(135deg, #1f4037, #99f2c8); }
  100% { background: linear-gradient(135deg, #0f2027, #2c5364); }
}

header {
  text-align: center;
  padding: 50px 20px 20px;
  background-color: rgba(0,0,0,0.4);
}

header h1 {
  font-size: 2.8rem;
  margin-bottom: 10px;
}

nav {
  background: #222;
  padding: 10px 0;
  text-align: center;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav li {
  display: inline-block;
  margin: 0 15px;
}

nav a {
  color: #99f2c8;
  text-decoration: none;
  font-weight: bold;
}

section {
  padding: 40px 20px;
  max-width: 800px;
  margin: auto;
  background-color: rgba(0,0,0,0.3);
  border-radius: 10px;
  margin-top: 20px;
}

.whatsapp-button {
  display: inline-block;
  padding: 12px 20px;
  background-color: #25D366;
  color: white;
  text-decoration: none;
  border-radius: 30px;
  font-weight: bold;
  transition: 0.3s;
}

.whatsapp-button:hover {
  background-color: #128C7E;
}

footer {
  text-align: center;
  padding: 20px;
  background: #111;
  color: #ccc;
  margin-top: 40px;
}