body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  background: #1e3a8a;
  color: white;
  padding: 1em;
  text-align: center;
}
nav a {
  margin: 0 1em;
  color: white;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 2em;
}
footer {
  background: #111827;
  color: white;
  padding: 1em;
  text-align: center;
  margin-top: 2em;
}
.logo {
  max-width: 120px;
  margin-bottom: 1em;
}
.whatsapp-btn {
  display: inline-block;
  margin-top: 1em;
  padding: 0.5em 1em;
  background: #25D366;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}