body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(180deg, #0a1f44, #08162e);
  color: #ffffff;
}

header {
  text-align: center;
  padding: 60px 20px;
}

nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  background: rgba(255,255,255,0.1);
  padding: 15px;
}

nav a {
  color: #ffffff;
  text-decoration: none;
}

.card {
  max-width: 900px;
  margin: 40px auto;
  background: #ffffff;
  color: #222;
  padding: 30px;
  border-radius: 10px;
}

.highlight {
  background: #eef3ff;
}

footer {
  text-align: center;
  padding: 25px;
  background: rgba(0,0,0,0.4);
}