.card-neon{
  position:relative;border-radius:1rem;overflow:hidden;
  background:color-mix(in oklab, var(--bs-body-bg) 86%, transparent);
  border:1px solid var(--bs-border-color);
}
.card-neon::before{
  content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;
  background:linear-gradient(120deg, rgba(138,43,226,.6), rgba(255,0,255,.6), rgba(0,255,229,.6));
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
}
.card-neon .card-title{ font-family:var(--font-display); letter-spacing:.5px; }