body {
  font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f9fa;
  color: #222;
}
header {
  background: #222;
  color: #fff;
  padding: 2rem 1rem 1rem 1rem;
  text-align: center;
}
main {
  max-width: 700px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  padding: 2rem;
}
section + section {
  margin-top: 2rem;
}
footer {
  text-align: center;
  color: #888;
  font-size: 0.9rem;
  margin: 2rem 0 1rem 0;
}
.lang-switch {
  text-align: right;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}
.lang-switch a {
  color: #0070f3;
  text-decoration: none;
  margin: 0 0.2em;
}
.lang-switch a:hover {
  text-decoration: underline;
}
.lang-switch span {
  font-weight: bold;
  color: #888;
}