/* 回到顶部按钮样式 */
.scroll-to-top-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  background-color: #808080;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.scroll-to-top-btn:hover {
  background-color: #666666;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.scroll-to-top-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.scroll-to-top-btn svg {
  width: 24px;
  height: 24px;
}

/* 淡入淡出动画 */
.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.fade-enter-from {
  opacity: 0;
  transform: translateY(10px);
}

.fade-leave-to {
  opacity: 0;
  transform: translateY(10px);
}

.fade-enter-to,
.fade-leave-from {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .scroll-to-top-btn {
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
  }

  .scroll-to-top-btn svg {
    width: 20px;
    height: 20px;
  }
}

/* 大屏幕优化 */
@media (min-width: 1440px) {
  .scroll-to-top-btn {
    width: 40px;
    height: 40px;
  }
}