:root {
  font-family: Arial, sans-serif;
  color: #222;
}

body {
  margin: 0;
  background: #f8f9fa;
}

.page-container {
  max-width: 960px;
  margin: 1.5rem auto 3rem;
  padding: 0 1rem;
}

.calculator-panel {
  margin-bottom: 2rem;
}

h1 {
  margin-bottom: 0.5rem;
}

.well {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1.5rem;
}

.button-row {
  margin-top: 1rem;
}

.resultContent {
  padding-top: 2rem;
  padding-bottom: 2rem;
  font-weight: bold;
  font-size: 1.35rem;
}

.hidden {
  display: none;
}

.detail-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1.8rem;
}

.detail-card h2 {
  margin-top: 1.2rem;
}

.detail-card p {
  line-height: 1.6;
}