body {
  font-family: -apple-system, "Hiragino Sans", "Yu Gothic", Arial, sans-serif;
  margin: 2rem;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.7;
}

main {
  max-width: 640px;
  margin: 0 auto;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.1rem;
}

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

nav ul li {
  margin: 1rem 0;
  text-align: center;
}

nav a {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: #4a6741;
  color: white;
  border-radius: 5px;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

nav a:hover,
nav a:focus {
  background-color: #33492c;
  outline: none;
}

.meta {
  color: #777;
  font-size: 0.9rem;
}

.lang-switch {
  text-align: right;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

@media (max-width: 480px) {
  body {
    margin: 1rem;
  }
  nav a {
    width: 100%;
    box-sizing: border-box;
  }
}