.flash-border-card {
  width: 200px;
  height: 200px;
  padding: 24px;
  border: 2px solid transparent;
  border-radius: 16px;
  background: #111827;
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  cursor: pointer;
  transition: border-color 0.3s ease;
}

.title {
  font-size: 24px;
  font-weight: 800;
}

.flash-border-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0; 
  border-radius: 16px;
  padding: 2px; 
  background: linear-gradient(90deg, #8b5cf6, #3b82f6, #06b6d4, #8b5cf6);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box, 
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;
  mask-composite: exclude;
  opacity: 0;
  filter: blur(6px); 
  transition: opacity 0.3s ease, filter 0.3s ease;
  pointer-events: none;
  z-index: 0;
}

.flash-border-card:hover::before {
  opacity: 1;
  filter: blur(4px); 
}

.flash-border-card:hover {
  border-color: transparent;
  z-index: 1;
}