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

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: #ffffff;
  color: #333333;
  line-height: 1.8;
  font-size: 16px;
}

header {
  background-color: #ffffff;
  padding: 2rem 1rem;
  text-align: center;
  border-bottom: 1px solid #eee;
}

header h1 {
  font-size: 2rem;
  color: #222222;
}

nav {
  display: flex;
  justify-content: center;
  background-color: #f9f9f9;
  border-bottom: 1px solid #e5e5e5;
}

nav a {
  color: #007acc;
  text-decoration: none;
  padding: 1rem 1.5rem;
  font-weight: 500;
}

nav a:hover {
  background-color: #e6f2fa;
}

.container {
  max-width: 960px;
  margin: 3rem auto;
  padding: 0 1rem;
}

.container h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #222222;
}

.container p, .container ul {
  margin-bottom: 1.5rem;
}

.container ul {
  list-style: disc inside;
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 14px;
  color: #777;
  border-top: 1px solid #e5e5e5;
  margin-top: 4rem;
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
  }
  nav a {
    padding: 0.8rem;
    border-top: 1px solid #eee;
  }
}