/* Hide expand arrow - cards are always expanded */

.card-expand-btn {
  display: none;
  
  /* Size */
  width: 40px;
  height: 40px;
  
  /* Styling */
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  cursor: pointer;
  
  /* Transitions */
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Remove default button styles */
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* Arrow SVG */
.expand-arrow {
  width: 20px;
  height: 20px;
  color: rgba(255, 255, 255, 0.7);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hover effect - Makes it pop */
.card-expand-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.card-expand-btn:hover .expand-arrow {
  color: rgba(255, 255, 255, 1);
  transform: translateY(2px);
}

/* Active/pressed state */
.card-expand-btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition-duration: 0.1s;
}

/* When card is expanded - rotate arrow 180° */
.card.expanded .expand-arrow {
  transform: rotate(180deg);
  color: rgba(255, 255, 255, 0.9);
}

.card.expanded .card-expand-btn {
  background: rgba(255, 255, 255, 0.08);
  border-width: 2px;
}

.card.expanded .card-expand-btn:hover .expand-arrow {
  transform: rotate(180deg) translateY(-2px);
  color: rgba(255, 255, 255, 1);
}

/* Color-coded by card type */
.card.philosophy .card-expand-btn {
  border-color: var(--philosophy);
}

.card.philosophy .card-expand-btn:hover {
  background: rgba(46, 236, 184, 0.15);
  border-color: var(--philosophy);
  box-shadow: 0 4px 12px rgba(46, 236, 184, 0.3);
}

.card.philosophy .expand-arrow {
  color: var(--philosophy);
}

.card.web3 .card-expand-btn {
  border-color: var(--web3);
}

.card.web3 .card-expand-btn:hover {
  background: rgba(227, 102, 247, 0.15);
  border-color: var(--web3);
  box-shadow: 0 4px 12px rgba(227, 102, 247, 0.3);
}

.card.web3 .expand-arrow {
  color: var(--web3);
}

.card.edge .card-expand-btn {
  border-color: var(--transdisciplinary);
}

.card.edge .card-expand-btn:hover {
  background: rgba(254, 199, 72, 0.15);
  border-color: var(--transdisciplinary);
  box-shadow: 0 4px 12px rgba(254, 199, 72, 0.3);
}

.card.edge .expand-arrow {
  color: var(--transdisciplinary);
}

/* Subtle bounce animation to draw attention */
@keyframes gentle-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.card-expand-btn {
  animation: gentle-bounce 2s ease-in-out infinite;
  animation-delay: 1s; /* Start after page loads */
}

/* Stop bouncing when card is expanded */
.card.expanded .card-expand-btn {
  animation: none;
}

/* Stop bouncing on hover (user found it) */
.card-expand-btn:hover {
  animation: none;
}

/* Pulsing glow effect on hover */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); }
  50% { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3); }
}

.card-expand-btn:hover {
  animation: pulse-glow 1.5s ease-in-out infinite;
}

/* Focus state for keyboard navigation */
.card-expand-btn:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.card-expand-btn:focus:not(:focus-visible) {
  outline: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .card-expand-btn {
    width: 44px;
    height: 44px;
  }
  
  .expand-arrow {
    width: 22px;
    height: 22px;
  }
}

/* Smooth entrance animation */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-expand-btn {
  animation: fade-in-up 0.6s ease-out, gentle-bounce 2s ease-in-out infinite;
  animation-delay: 0.3s, 1.5s;
  opacity: 0;
  animation-fill-mode: forwards;
}

/* Stagger the arrow appearances */
.card:nth-child(1) .card-expand-btn {
  animation-delay: 0.3s, 1.5s;
}

.card:nth-child(2) .card-expand-btn {
  animation-delay: 0.4s, 1.6s;
}

.card:nth-child(3) .card-expand-btn {
  animation-delay: 0.5s, 1.7s;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card-expand-btn {
    border-width: 3px;
  }
  
  .expand-arrow {
    stroke-width: 3;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .card-expand-btn,
  .expand-arrow {
    animation: none !important;
    transition: none !important;
  }
}

/* Touch device optimization */
@media (hover: none) and (pointer: coarse) {
  .card-expand-btn {
    /* Larger touch target */
    width: 48px;
    height: 48px;
  }
  
  /* Immediate feedback on touch */
  .card-expand-btn:active {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(0.95);
  }
}