/* カスタムナビゲーションスタイル - Bootstrapと組み合わせて使用 */
.navbar {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
}

.navbar-brand {
  font-weight: bold;
  font-size: 1.6rem;
  padding: 0;
}

.navbar-brand a {
  color: #0066cc;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand a:hover {
  text-decoration: none;
}

.site-logo {
  width: 48px;
  height: 48px;
  vertical-align: middle;
  border-radius: 3px;
}

.navbar-nav .nav-item {
  margin: 0 5px;
}

.navbar-nav .nav-link {
  color: #333;
  transition: color 0.3s;
  padding: 5px 10px;
}

.navbar-nav .nav-link:hover {
  color: #0066cc;
  text-decoration: none;
}

.navbar-nav .nav-item.active .nav-link {
  color: #0066cc;
  font-weight: bold;
}

/* ハンバーガーメニューカスタマイズ */
.navbar-toggler {
  padding: 0;
  border: none;
  background: transparent;
}

.navbar-toggler:focus {
  box-shadow: none;
  outline: none;
}

.navbar-toggler .hamburger-icon {
  display: inline-block;
  width: 30px;
  height: 22px;
  position: relative;
}

.navbar-toggler .hamburger-icon span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: #333;
  border-radius: 3px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: .25s ease-in-out;
}

.navbar-toggler .hamburger-icon span:nth-child(1) {
  top: 0px;
}

.navbar-toggler .hamburger-icon span:nth-child(2) {
  top: 9px;
}

.navbar-toggler .hamburger-icon span:nth-child(3) {
  top: 18px;
}

.navbar-toggler[aria-expanded="true"] .hamburger-icon span:nth-child(1) {
  top: 9px;
  transform: rotate(135deg);
}

.navbar-toggler[aria-expanded="true"] .hamburger-icon span:nth-child(2) {
  opacity: 0;
  left: -60px;
}

.navbar-toggler[aria-expanded="true"] .hamburger-icon span:nth-child(3) {
  top: 9px;
  transform: rotate(-135deg);
}

/* モバイルメニュー */
@media (max-width: 991.98px) {
  .navbar-brand {
    font-size: 1.4rem;
  }
  
  .navbar-brand a {
    gap: 8px;
  }
  
  .navbar-collapse {
    background-color: #fff;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  }
  
  .navbar-nav {
    padding: 0.5rem 0;
    width: 100%;
  }
  
  .navbar-nav .nav-item {
    margin: 0;
    border-bottom: 1px solid #eee;
    width: 100%;
  }
  
  .navbar-nav .nav-item:last-child {
    border-bottom: none;
  }
  
  .navbar-nav .nav-link {
    padding: 12px 15px;
  }
}

/* スモールモバイル向け */
@media (max-width: 480px) {
  .navbar-brand {
    font-size: 1.2rem;
  }
  
  .navbar-brand a {
    gap: 6px;
  }
  
  .site-logo {
    width: 36px;
    height: 36px;
  }
}