body {
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #222;
  margin: 0;
  padding: 0;
}

header {
  background: #263238;
  color: white;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header h1 a {
  color: white;
  text-decoration: none;
}

nav a {
  color: #90caf9;
  text-decoration: none;
  margin-left: 1rem;
}

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

main {
  padding: 2rem;
}

h2, h3 {
  color: #37474f;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 0.5rem 0;
}

footer {
  background: #263238;
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}