/* Timeline Card Stack Styles */
.card-stack {
  position: relative;
  width: 100%;
  max-width: 350px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  perspective: 1000px;
  cursor: pointer;
}

.card-stack-card {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(244, 114, 182, 0.2);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
  background: white;
}

.card-stack-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 1rem;
}

/* Stack effect - 3 cards layered */
.card-stack-card:nth-child(1) {
  z-index: 3;
  transform: translateY(0) translateX(0) rotate(0deg);
}

.card-stack-card:nth-child(2) {
  z-index: 2;
  transform: translateY(-8px) translateX(-6px) rotate(-3deg);
  opacity: 0.9;
}

.card-stack-card:nth-child(3) {
  z-index: 1;
  transform: translateY(-16px) translateX(-12px) rotate(-6deg);
  opacity: 0.8;
}

/* Hover effect - fan out cards */
.card-stack:hover .card-stack-card:nth-child(1) {
  transform: translateY(0) translateX(20px) rotate(5deg);
}

.card-stack:hover .card-stack-card:nth-child(2) {
  transform: translateY(-8px) translateX(0) rotate(0deg);
  opacity: 1;
}

.card-stack:hover .card-stack-card:nth-child(3) {
  transform: translateY(-16px) translateX(-20px) rotate(-5deg);
  opacity: 1;
}

/* Hover me indicator */
.card-stack::before {
  content: 'xem kỷ niệm';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  color: white;
  font-size: 1.2rem;
  font-weight: 600;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  font-family: 'Playpen Sans', cursive;
}

.card-stack:hover::before {
  opacity: 1;
}

/* Active/Click effect */
.card-stack:active .card-stack-card {
  transform: scale(0.98);
}

/* Responsive adjustments for mobile */
@media (max-width: 767px) {
  .card-stack {
    max-width: 100%;
  }

  .card-stack::before {
    font-size: 1rem;
  }

  /* Reduce offset on mobile for better visibility */
  .card-stack-card:nth-child(2) {
    transform: translateY(-6px) translateX(-4px) rotate(-3deg);
  }

  .card-stack-card:nth-child(3) {
    transform: translateY(-12px) translateX(-8px) rotate(-6deg);
  }

  .card-stack:hover .card-stack-card:nth-child(1) {
    transform: translateY(0) translateX(15px) rotate(4deg);
  }

  .card-stack:hover .card-stack-card:nth-child(3) {
    transform: translateY(-12px) translateX(-15px) rotate(-4deg);
  }
}

/* Add pink overlay on hover for better visibility */
.card-stack-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(244, 114, 182, 0.1), rgba(248, 113, 113, 0.1));
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card-stack:hover .card-stack-card::after {
  opacity: 1;
}