body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #333;
}

header {
  background: #0b5cff;
  color: white;
  padding: 2rem;
  text-align: center;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: white;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

footer {
  text-align: center;
  padding: 1rem;
  color: #666;
}