/* 返回顶部按钮样式 */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 26px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  color: #fff;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--primary-dark, #d25600);
  transform: translateY(-3px);
}

.back-to-top svg {
  width: 64px;
  height: 64px;
}

/* 移动设备样式调整 */
@media (max-width: 768px) {
  .back-to-top {
    width: 40px;
    height: 40px;
    bottom: 20px;
    right: 20px;
  }

  .back-to-top svg {
    width: 40px;
    height: 40px;
  }
}