/* Base styles */
* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background-color: #f4f4f4;
  color: #333;
}

header {
  background: #222;
  color: #fff;
  padding: 2rem 1rem;
  text-align: center;
}

.nav-links {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

header nav a {
  color: #f0f0f0;
  text-decoration: none;
  font-size: 1.1rem;
}

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

main {
  padding: 1rem;
  max-width: 900px;
  margin: auto;
}

section {
  margin-bottom: 2rem;
}

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

li {
  background: #fff;
  margin-bottom: 1rem;
  padding: 1rem;
  border-left: 5px solid #0078D4;
  border-radius: 4px;
}

footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1rem;
}

/* Mobile optimization */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.8rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  header nav a {
    font-size: 1rem;
    padding: 0.5rem;
    display: block;
  }

  li {
    font-size: 1rem;
  }

  section p, section li {
    padding: 0.75rem;
  }
}