.new-bill-button {
  min-width: 140px;
  transition: transform 0.2s;
}
.view-bill-button:hover {
  background: #3498db;
  color: white;
}
.save-button {
  padding: 0.75rem 2rem !important;
}
.billing-form {
  max-width: 600px;
  margin: 20px auto;
  padding: 30px;
  background-color: #ffffff;
  border-radius: 15px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.billing-form * {
  box-sizing: border-box;
}
.billing-form label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
}
.billing-form input,
.billing-form select,
.billing-form textarea {
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}
.billing-form input:focus,
.billing-form select:focus,
.billing-form textarea:focus {
  outline: none;
  border-color: #0073aa;
  box-shadow: 0 0 0 2px rgba(0, 115, 170, 0.2);
}
.billing-form button {
  width: 100%;
  padding: 12px 20px;
  background-color: #0073aa;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.1s ease;
}
.billing-form button:hover {
  background-color: #005a87;
}
.billing-form button:active {
  transform: scale(0.98);
}
#choose_photo_button {
  background-color: #f0f0f0;
  color: #333;
  border: 1px solid #ddd;
}
#choose_photo_button:hover {
  background-color: #e0e0e0;
}
#user_photo_preview {
  display: block;
  max-width: 100px;
  max-height: 100px;
  margin: 10px auto;
  border-radius: 50%;
  object-fit: cover;
}
@media (max-width: 768px) {
  .billing-form {
    padding: 20px;
  }
  .billing-form input,
  .billing-form select,
  .billing-form textarea,
  .billing-form button {
    font-size: 16px;
    padding: 10px;
  }
}