body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9fafb;
  color: #222;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header, main, footer {
  padding: 1rem;
  max-width: 700px;
  margin: auto;
}

footer {
  margin-top: auto;
  text-align: center;
  color: #666;
  font-size: 0.9rem;
}