/* 警告消息样式 */
.alert-message {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(255, 76, 76, 0.9);
  color: white;
  padding: 12px 20px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  max-width: 80%;
  text-align: center;
  font-size: 16px;
  animation: fadeInOut 3s forwards;
}

/* 成功消息样式 */
.success-message {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(76, 175, 80, 0.9);
  color: white;
  padding: 12px 20px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  max-width: 80%;
  text-align: center;
  font-size: 16px;
  animation: fadeInOut 3s forwards;
}

/* 加载中指示器 */
.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

/* 动画关键帧 */
@keyframes fadeInOut {
  0% { opacity: 0; transform: translate(-50%, -20px); }
  10% { opacity: 1; transform: translate(-50%, 0); }
  90% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, -20px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 响应式调整 */
@media (max-width: 768px) {
  .alert-message,
  .success-message {
    font-size: 14px;
    max-width: 90%;
    padding: 10px 15px;
  }
}