body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(to bottom right, #d1fae5, #dbeafe);
  color: #1f2937;
}
header {
  background: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
nav a {
  margin-left: 1rem;
  color: #2563eb;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  text-align: center;
  padding: 5rem 2rem;
}
footer {
  text-align: center;
  padding: 1rem;
  background: white;
  font-size: 0.875rem;
  color: #6b7280;
  box-shadow: 0 -1px 4px rgba(0,0,0,0.05);
}