/* 头部菜单响应式样式 */
.header-nav {
  transition: all 0.3s ease;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  background-color: white;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  z-index: 40;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* 移动端菜单激活状态 */
.mobile-menu.active {
  display: block;
  opacity: 1;
  visibility: visible;
}

/* 移动端菜单项 */
.mobile-menu-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #f3f4f6;
}

/* 移动端子菜单 */
.mobile-submenu {
  padding-left: 1.5rem;
  background-color: #f9fafb;
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .header-nav nav {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
}

/* 平板断点 */
@media (min-width: 768px) and (max-width: 1023px) {
  .header-nav .max-w-\[1440px\] {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* 手机断点 */
@media (max-width: 767px) {
  .header-nav .max-w-\[1440px\] {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
  
  .header-nav img {
    width: 2rem;
  }
}

/* 小屏幕手机断点 */
@media (max-width: 375px) {
  .header-nav .max-w-\[1440px\] {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }
  
  .header-nav img {
    width: 1.75rem;
  }
}

/* 滚动时固定头部 */
.header-nav.scrolled {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* 下拉菜单动画 */
.header-nav .group:hover .group-hover\:block {
  animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}