/* 全局 Toast 提示样式 */
.toast{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 16px;
  z-index: 9999;
  display: none;
  animation: fadeInOut 0.3s ease;
}
@keyframes fadeInOut {
  from { opacity: 0; }
  to { opacity: 1; }
}