/* 外层容器居中 */
#cell-calc-wrapper {
  display: flex;
  justify-content: center; /* 水平居中 */
  margin-top: 40px;        /* 距顶部留一点空 */
}

/* 小程序本体样式 */
#cell-calc {
  font-family: Arial, sans-serif;
  border: 1px solid #ccc;
  padding: 20px;
  width: 320px;
  background: #f9f9f9;
  border-radius: 8px;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.1);
}
#cell-calc input, #cell-calc select {
  width: 100%;
  margin: 5px 0 10px;
  padding: 5px;
}
#cell-calc .output {
  margin-top: 10px;
  font-weight: bold;
}