body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
}
header {
  background: #f5f5f5;
  padding: 10px 0;
}
nav {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 15px;
}
nav a {
  text-decoration: none;
  color: #333;
  margin-right: 15px;
}
nav a:hover {
  color: #000;
}
main {
  max-width: 800px;
  margin: 20px auto;
  padding: 0 15px;
}
footer {
  background: #f5f5f5;
  text-align: center;
  padding: 10px;
  font-size: 0.9em;
  color: #555;
}
h1, h2, h3 {
  color: #333;
}
.lang-switch {
  float: right;
}