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

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #f9f9f9;
}

header {
  background: #2c3e50;
  color: white;
  padding: 1.5rem 2rem;
}

header h1 {
  margin-bottom: 0.5rem;
}

nav a {
  color: #ecf0f1;
  text-decoration: none;
  margin-right: 1.5rem;
  font-weight: 500;
}

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

main {
  max-width: 700px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: #777;
  font-size: 0.9rem;
}