@charset "UTF-8";
body {
  font-family: "Yu Gothic", "Meiryo", sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}

header {
  background: #3498db;
  color: #fff;
  padding: 1em 0;
  text-align: center;
}

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

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

main {
  max-width: 800px;
  margin: 2em auto;
  background: #fff;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

section {
  margin-bottom: 2em;
}

footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1em 0;
}