body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f9fafb;
  color: #333;
  line-height: 1.6;
}

header {
  background: #1e40af;
  color: white;
  padding: 1rem;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

nav {
  margin-top: 0.5rem;
}

nav a {
  color: #e0e7ff;
  margin-right: 1rem;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: white;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  padding: 1rem;
  background: #f1f5f9;
  color: #555;
  margin-top: 2rem;
  font-size: 0.9rem;
}