/* 浮动按钮 */
.float-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: #1677ff;
  color: #fff;
  border: none;
  font-size: 14px;
  text-align: center;
  line-height: 60px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 999;
}
.float-btn:hover {
  background: #0f6adc;
}

/* 遮罩 */
.modal-mask {
  position: fixed;
  left: 0; top: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

/* 弹窗 */
.modal-box {
  background: #fff;
  width: 90%;
  max-width: 400px;
  padding: 24px;
  border-radius: 12px;
  position: relative;
}
.modal-close {
  position: absolute;
  right: 16px; top: 16px;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
}