/* 返回按钮 */
.back-button {
  position: fixed;
  top: 20px;
  left: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.back-button:hover {
  background: rgba(15, 23, 42, 0.95);
  transform: translateX(-3px);
}

.back-button svg {
  width: 20px;
  height: 20px;
  stroke: #fff;
}

@media (max-width: 768px) {
  .back-button {
    top: 15px;
    left: 15px;
    width: 40px;
    height: 40px;
  }
  
  .back-button svg {
    width: 18px;
    height: 18px;
  }
}