/* 移动端导航窗口动画 */
.mobile-nav {
  position: absolute;
  top: 100%;
  right: 0;
  width: 100vw;
  height: 264px;
  background: #fff;
  z-index: 1000;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  flex-direction: column;
  align-items: stretch;
  opacity: 0;
  transform: translateY(-30px);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.5s, transform 0.5s;
}
.mobile-nav.active,
.mobile-nav.closing {
  visibility: visible;
  pointer-events: auto;
}
.mobile-nav.active {
  opacity: 1;
  transform: translateY(0);
}
.mobile-nav.closing {
  opacity: 0;
  transform: translateY(-30px);
}