/* ベース設定 */
body {
  margin: 0;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  background-color: #f8f9fa;
  color: #333;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ヘッダー */
.site-header {
  background-color: #ffffff;
  padding: 1rem 0;
  border-bottom: 1px solid #ddd;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.logo {
  flex: 0 0 auto;
}

.logo img {
  height: auto;
  width: auto;
  max-height: 90px;
  min-height: 50px;
  display: block;
}

.header-nav {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  flex: 1 1 auto;
}

.language-selector {
  margin-bottom: 0.5rem;
}

.main-nav {
  display: flex;
  flex-direction: row;
  gap: 1rem;
}

.main-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1rem;
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  text-decoration: none;
  color: #007bff;
  font-weight: bold;
}

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

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown .dir {
  cursor: pointer;
  background-color: #007bff;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

.dropdown ul {
  display: none;
  position: absolute;
  background-color: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 0.5rem 0;
  right: 0;
  z-index: 1000;
}

.dropdown:hover ul {
  display: block;
}

.dropdown ul li {
  padding: 0.5rem 1rem;
}

.dropdown ul li a {
  color: #007bff;
  text-decoration: none;
}

.dropdown ul li a:hover {
  text-decoration: underline;
}

/* メインコンテンツ */
.content {
  padding: 2rem 0;
  width: 100%;
}

h1, h2, h3 {
  color: #003366;
}

ul {
  padding-left: 1.2rem;
}

/* フッター */
.site-footer {
  background-color: #0779b2;
  color: #ffffff;
  padding: 2rem 1rem;
  margin-top: 3rem;
}

.site-footer a {
  color: #ffcc00;
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.copyright {
  text-align: center;
  font-size: 0.875rem;
  margin-top: 1rem;
  border-top: 1px solid #eee;
  padding-top: 1rem;
}

/* メディアクエリ：モバイル対応 */
@media (min-width: 768px) {
  .site-header {
    flex-direction: row;
  }

  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
  }

  .main-nav {
    flex-direction: row;
  }

  .main-nav ul {
    justify-content: flex-end;
  }
}