body {
    background-color: #f8f9fa;
  }

  label,
  .form-label {
    font-weight: normal !important;
    font-size: 0.85em;
    margin-bottom: 2px;
  }

  .container-sm {
    display: flex;
    justify-content: center;
    margin: 30px auto;
  }

  .card {
    max-width: 1000px;
    width: 100%;
    padding: 20px;
    border-radius: 12px;
    background-color: #fff;
  }

  .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .form-section {
    padding: 15px;
    background-color: #f1f1f1;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 20px;
  }

  .form-control {
    padding: 4px 6px;
    font-size: 0.85em;
    height: auto;
    margin-bottom: 2px;
  }

  .invalid-feedback {
    font-size: 0.75em;
    color: #dc3545;
    min-height: 1.25em;
    margin-top: 2px;
  }

  .form-columns-inner {
    display: flex;
    gap: 10px;
  }

  .form-column-inner {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .formaat-grid {
    display: grid;
    grid-template-columns: 1fr 160px;
    gap: 20px;
    align-items: stretch;
    height: 100%;
  }

  .form-illustratie {
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #ccc;
    border-radius: 4px;
    overflow: hidden;
    max-height: 220px;
  }

  .form-illustratie img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
  }

  .bottom-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
  }

  .bottom-row .center {
    flex: 2;
    text-align: center;
    font-size: 0.85em;
  }

  .bottom-row .left,
  .bottom-row .right {
    flex: 1;
    display: flex;
    justify-content: center;
  }

  h1 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    font-weight: normal;
  }

  h3 {
    font-size: 1rem;
    margin-top: 10px;
    text-align: center;
    font-weight: normal;
  }

  #offerteBtn:disabled {
    background-color: #ccc !important;
    border-color: #ccc !important;
    cursor: not-allowed;
  }

  .katern-input {
    width: 100px !important;
  }

  .katern-label {
    width: 80px;
    text-align: left;
  }

  @media (max-width: 768px) {
    .form-grid {
      grid-template-columns: 1fr;
    }

    .formaat-grid {
      flex-direction: column;
      align-items: stretch;
    }

    .bottom-row {
      flex-direction: column;
      align-items: stretch;
    }
  }