/* 計算機外框 */
.calculator-container {
  max-width: 400px;
  margin: 40px auto;
  padding: 24px 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.calculator-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.calculator-form > div {
  display: flex;
  align-items: center;
  margin-bottom: 0;
}

.calculator-form > div > input[type="number"] {
  margin-left: 4px;
  flex: 1 1 auto;
  min-width: 0;
}

.calculator-form input[type="number"] {
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 16px;
}

.calculator-result {
  background: #f7f7f7;
  border-radius: 8px;
  padding: 16px 12px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 16px;
}

.result-label {
  color: #555;
}

.result-value {
  font-weight: bold;
  color: #1a73e8;
}

.core-error-msg {
  text-align: center;
  color: #d32f2f;
  font-size: 18px;
  font-weight: bold;
  margin-top: 24px;
}