:root {
  --primary-color: #003366;
  --secondary-color: #0055a5;
  --accent-color: #e0f0ff;
  --text-color: #333;
  --bg-color: #fff;
}

body {
  font-family: 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
}

header {
  background-color: var(--primary-color);
  color: white;
  padding: 1rem;
  text-align: center;
  position: relative;
}

.language-buttons {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.language-buttons button {
  margin-left: 0.5rem;
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 999px;
  font-weight: bold;
  cursor: pointer;
  background-color: var(--secondary-color);
  color: white;
}

.language-buttons button.active {
  background-color: var(--accent-color);
  color: black;
}


ul {
  list-style-type: disc; /* 黒丸 */
  padding-left: 1.5rem;  /* インデント調整 */
}

nav {
  background-color: var(--secondary-color);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0.2rem;
}

nav a {
  color: white;
  margin: 0.2rem;
  text-decoration: none;
}

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

main {
  padding: 2rem;
}

.img-box {
   text-align: center;
}
.img-box img {
   width: 70%;
}

footer {
  margin-top: 2rem;
}

.footer-top {
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 1rem;
}

.footer-bottom {
  background-color: white;
  text-align: center;
  padding: 1rem;
}

.footer-logo {
  height: 40px;
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: center;
  }

  main {
    padding: 1rem;
  }

  .language-buttons {
    top: 0.5rem;
    right: 0.5rem;
  }
}