body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(180deg, #0a1f44, #2c3e66);
  color: #f1f1f1;
}

header {
  text-align: center;
  padding: 70px 20px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  background: rgba(255,255,255,0.1);
  padding: 15px;
}

nav a {
  color: #eaeaea;
  text-decoration: none;
  font-weight: 500;
}

.card {
  max-width: 900px;
  margin: 40px auto;
  background: #f6f6f6;
  color: #222;
  padding: 35px;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}

.card h2 {
  color: #0a1f44;
}

.highlight {
  background: #eceff5;
}

footer {
  text-align: center;
  padding: 30px;
  background: rgba(0,0,0,0.45);
}

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