/* 返回顶部按钮样式 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #d4af37 0%, #b8941f 100%);
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #fff;
  transform: translateY(20px);
}

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

.back-to-top:hover {
  background: linear-gradient(135deg, #e6c158 0%, #d4af37 100%);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  transform: translateY(-5px);
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
  font-size: 12px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.back-to-top-inner svg {
  width: 24px;
  height: 24px;
  margin-bottom: 2px;
  stroke: #fff;
  stroke-width: 3;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 80px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
  
  .back-to-top-inner svg {
    width: 20px;
    height: 20px;
  }
  
  .back-to-top-inner span {
    font-size: 10px;
  }
}