*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
  color: #1a1a1a;
}

header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ddd;
}

header a {
  color: inherit;
  text-decoration: none;
  font-weight: 600;
}

main {
  flex: 1;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  font-size: 0.875rem;
  color: #666;
}