* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #1a1a1a;
  line-height: 1.5;
}

header, main, footer {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}