body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  background: #0f172a;
  color: #e2e8f0;
}

header {
  text-align: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, #1e3a8a, #0ea5e9);
}

.logo {
  width: 150px;
  border-radius: 20px;
}

h1 {
  margin: 10px 0 5px;
}

main {
  padding: 20px;
  max-width: 900px;
  margin: auto;
}

.card {
  background: #1e293b;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 20px;
}

footer {
  text-align: center;
  padding: 20px;
  opacity: 0.6;
}