* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
}

/* Header Styles */
.navbar {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand img {
  height: 40px;
}
.navbar-expand-lg .navbar-nav .nav-link {
  padding-right: 1rem;
  padding-left: 1rem;
}

@media (max-width: 991px) {
  .navbar-nav .dropdown-menu {
    border: none;
    padding-left: 1.5rem;
  }
}

/* 当鼠标悬停在下拉项上时显示下拉菜单 (仅限桌面) */
@media (min-width: 992px) {
  .nav-item.dropdown:hover .dropdown-menu {
    display: block;
  }

  /* 可选：旋转箭头图标 */
  .nav-item.dropdown:hover .dropdown-toggle::after {
    transform: rotate(-90deg);
  }
}