/* 页面加载动画 */
.page-loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* 页面内容过渡 */
main {
  transition: opacity 0.3s ease;
  opacity: 1;
}

/* 导航Tab动画 */
.tab-icon {
  transition: transform 0.2s ease, opacity 0.3s ease;
}

.nav-tab.active .tab-icon {
  transform: translateY(-3px);
}