.card-spotlight {
  position: relative;
  overflow: hidden;
  --mouse-x: 50%;
  --mouse-y: 50%;
  --spotlight-color: rgba(30, 100, 200, 0.90);
}

.card-spotlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle 400px at var(--mouse-x) var(--mouse-y), var(--spotlight-color), transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
  z-index: 1;
}

.card-spotlight:hover::before,
.card-spotlight:focus-within::before {
  opacity: 0.9;
}

.card-spotlight > * {
  position: relative;
  z-index: 2;
}