body {
    font-family: Arial, sans-serif;
    background: #c6ede3;
    margin: 0;
    padding: 20px;
  }
  .container {
    max-width: 650px;
    margin: 40px auto;
    background: #ffffff;
    padding: 25px;
    border-radius: 10px;
    border: 2px solid #0fd3a0;
    box-shadow: 0 0 12px rgba(0, 128, 96, 0.15);
    background-color: #fefefe;
    overflow: visible;
  }
  .form-box { width: 100%; }
  h1 {
    text-align: center; color: #0033a0; font-size: 22px; margin-bottom: 30px; position: relative;
  }
  h1::after {
    content: ""; display: block; width: 100%; height: 1.5px; background: #0fd3a0; margin: 12px auto 0 auto; border-radius: 2px;
  }
  .form-group { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
  .form-group label { font-weight: bold; margin-bottom: 4px; color: #005177; }
  input[type="number"], input[type="date"], select {
    width: 100%; padding: 10px; font-size: 16px; border: 1px solid #ccc; border-radius: 6px; background: #f8fbff; box-sizing: border-box;
  }
  .radio-group { display: flex; flex-direction: column; gap: 4px; margin-top: 4px; }
  .radio-group label { font-weight: normal; display: flex; align-items: center; gap: 8px; }
  .radio-group input[type="number"] { width: 100%; padding: 8px; margin-top: 5px; font-size: 15px; }
  .btn-calculate {
    width: 100%; max-width: 240px; background-color: #0033a0; color: white; border: none; padding: 12px; font-size: 16px;
    border-radius: 6px; cursor: pointer; font-weight: bold; text-align: center; display: block; text-decoration: none; margin: 10px auto;
  }
  .btn-calculate:hover { background-color: #002080; }
  .result-group {
    display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid #eee; font-size: 16px;
  }
  .result-label { font-weight: 600; color: #444; }
  .result-value { text-align: right; color: #222; font-weight: 500; }
  .result-group.highlight { background: #f0f8f5; padding: 12px; border-radius: 6px; font-size: 17px; margin-top: 15px; }
  .blue { color: #0033a0; }
  /* Scroll vertical activé */
  html, body { overflow-x: hidden; overflow-y: auto; height: auto; min-height: 100%; margin: 0; padding: 0; }
  * { max-width: 100%; box-sizing: border-box; }
  @media (max-width: 576px) {
    .container { margin: 10px auto; padding: 15px; }
    h1 { font-size: 20px; margin-bottom: 20px; }
    .form-group { margin-bottom: 12px; }
  }