/* 加载动画样式 - 在 JavaScript 执行前显示，避免页面空白 */
#appLoading {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
  z-index: 9999;
}

#appLoading .spinner {
  position: relative;
  width: 80px;
  height: 80px;
}

#appLoading .arc {
  position: absolute;
  border: 3px solid transparent;
  border-radius: 50%;
}

#appLoading .arc1 {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-top-color: #FF5F57;
  animation: spin 1.6s linear infinite;
}

#appLoading .arc2 {
  top: 10%;
  left: 10%;
  width: 80%;
  height: 80%;
  border-right-color: #FFBD2E;
  animation: spin 1.2s linear reverse infinite;
}

#appLoading .arc3 {
  top: 20%;
  left: 20%;
  width: 60%;
  height: 60%;
  border-bottom-color: #28C840;
  animation: spin 1s ease-in-out infinite;
}

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