/* Button Container with Metallic Gradient and Depth */
.card-container {
  position: relative;
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, #e0e0e000, #c0c0c000);
  border-radius: 30px;
  box-shadow:
    6px 6px 12px rgba(0, 0, 0, 0.3),
    -6px -6px 12px rgba(255, 255, 255, 0.3),
    inset 2px 2px 4px rgba(255, 255, 255, 0.4),
    inset -2px -2px 4px rgba(0, 0, 0, 0.5);
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

/* Shining Effect Overlay */
.card-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    45deg,
    transparent,
    rgba(255, 255, 255, 0.7),
    transparent
  );
  background-size: 200% 200%;
  animation: shine 2s infinite ease-in-out;
  border-radius: 30px;
}

@keyframes shine {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}