body {
  font-family: system-ui, sans-serif;
  margin: 2rem auto;
  max-width: 900px;
  padding: 1rem;
  line-height: 1.6;
  background: #fdfdfd;
  color: #333;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  color: #2c3e50;
  font-size: 2.4rem;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
}

nav a {
  text-decoration: none;
  color: #0077cc;
  font-weight: 500;
}

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

main {
  text-align: center;
  font-size: 1.1rem;
}

ul#timeline {
  list-style: none;
  padding: 0;
  margin-top: 2rem;
}

ul#timeline li {
  margin-bottom: 1rem;
  padding-left: 1rem;
  border-left: 3px solid #0077cc;
}