.accordion-flat .accordion-item{
  border: none;
  border-bottom: 1px solid #ddd;
  background: transparent;
}
.accordion-button{
  background: transparent !important;
  box-shadow: none !important;
  color: #BA0020 !important;
}

.accordion-button::after{ display:none; }

.acc-custom{
  font-weight: 700;
  color: var(--color-green);
  padding-left: 28px;
  position: relative;
}
.acc-custom::before{
  content:"+";
  position:absolute;
  left:0;
  font-size:22px;
  font-weight:800;
  line-height:1;
  color: var(--color-green);
}
.acc-custom:not(.collapsed)::before{ content:"−"; }

.accordion-body{ padding-left: 28px; }