/* 导航栏容器 */
.main-nav {
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  padding: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

/* Logo */
.nav-logo {
  color: #1f2937;
  font-size: 1.25rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-logo:hover {
  color: #3b82f6;
}

/* 导航菜单 */
.nav-menu {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

/* 导航链接 */
.nav-link {
  color: #374151;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  transition: all 0.2s;
  display: block;
}

.nav-link:hover {
  color: #3b82f6;
  background-color: #eff6ff;
}

.nav-link.active {
  color: #3b82f6;
  background-color: #eff6ff;
  font-weight: 500;
}

/* 下拉菜单容器 */
.nav-dropdown {
  position: relative;
}

/* 下拉按钮 */
.nav-dropdown-toggle {
  color: #374151;
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: all 0.2s;
}

.nav-dropdown-toggle:hover {
  color: #3b82f6;
  background-color: #eff6ff;
}

/* 下拉图标 */
.nav-dropdown-icon {
  transition: transform 0.2s;
}

.nav-dropdown-toggle[aria-expanded="true"] .nav-dropdown-icon {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  list-style: none;
  padding: 0.5rem 0;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s;
  z-index: 1000;
}

.nav-dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 下拉菜单项 */
.nav-dropdown-menu li {
  margin: 0;
}

.nav-dropdown-link {
  color: #374151;
  text-decoration: none;
  padding: 0.5rem 1rem;
  display: block;
  transition: all 0.2s;
}

.nav-dropdown-link:hover {
  color: #3b82f6;
  background-color: #eff6ff;
}

.nav-dropdown-link.active {
  color: #3b82f6;
  background-color: #eff6ff;
  font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    height: auto;
    padding: 1rem;
    gap: 1rem;
  }
  
  .nav-menu {
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .nav-dropdown {
    width: 100%;
  }
  
  .nav-dropdown-toggle {
    width: 100%;
    justify-content: space-between;
  }
  
  .nav-dropdown-menu {
    position: static;
    margin-top: 0.5rem;
    box-shadow: none;
    border: none;
    border-top: 1px solid #e5e7eb;
    border-radius: 0;
  }
}