/* 
 * Mobile-First Flip Card Component - Core Stylesheet
 * Version: 1.0.0
 * Features: Responsive, accessible, optimized for mobile devices
 */

/* Core flip card functionality with mobile-first approach */
.flip-card-mobile {
  perspective: 1000px;
  position: relative;
  height: 360px; /* Smaller default height for mobile */
  width: 100%;
  max-width: 320px; /* Smaller max-width for mobile */
  margin: 0 auto;
  border-radius: 0.75rem; /* Slightly smaller radius */
}

/* Increase card size on larger screens */
@media (min-width: 640px) {
  .flip-card-mobile {
    height: 420px;
    max-width: 380px;
  }
}

@media (min-width: 1024px) {
  .flip-card-mobile {
    height: 450px;
    max-width: 400px;
  }
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform-style: preserve-3d;
}

/* Explicitly using tap-to-flip instead of hover for mobile-first approach */
.flip-card-mobile.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

/* Only apply hover on devices that support it */
@media (hover: hover) {
  .flip-card-mobile:hover .flip-card-inner {
    transform: rotateY(180deg);
  }
}

/* Accessibility: Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .flip-card-inner {
    transition: none;
  }
  
  .flip-card-mobile.flipped .flip-card-inner {
    transition: none;
  }
}

.flip-card-front, 
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 0.75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  overflow: auto;
}

/* Optimize scrolling for touch devices */
.flip-card-front::-webkit-scrollbar,
.flip-card-back::-webkit-scrollbar {
  width: 6px;
}

.flip-card-front::-webkit-scrollbar-thumb,
.flip-card-back::-webkit-scrollbar-thumb {
  background-color: rgba(0,0,0,0.2);
  border-radius: 3px;
}

.flip-card-back {
  transform: rotateY(180deg);
}

/* Responsive typography for mobile */
.flip-card-mobile h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

@media (min-width: 640px) {
  .flip-card-mobile h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
  }
}

/* Mobile-optimized padding */
.flip-card-mobile .flip-card-front,
.flip-card-mobile .flip-card-back {
  padding: 0.75rem;
}

@media (min-width: 640px) {
  .flip-card-mobile .flip-card-front,
  .flip-card-mobile .flip-card-back {
    padding: 1rem;
  }
}

/* Responsive grid for card layouts - mobile first */
.card-grid-mobile {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem;
}

@media (min-width: 640px) {
  .card-grid-mobile {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 1rem;
  }
}

@media (min-width: 1024px) {
  .card-grid-mobile {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 1.5rem;
  }
}

/* Larger touch targets for mobile */
.flip-card-mobile .flip-trigger {
  width: 100%;
  min-height: 44px; /* Minimum recommended touch target size */
  margin-top: 0.5rem;
  padding: 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
}

@media (min-width: 640px) {
  .flip-card-mobile .flip-trigger {
    padding: 0.6rem;
    font-size: 1rem;
  }
}

/* Focus states for better accessibility */
.flip-card-mobile:focus-within {
  outline: none;
}

.flip-card-mobile:focus-within .flip-card-inner {
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

.flip-card-mobile .flip-trigger:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

/* Fallbacks for older browsers */
@supports not (transform-style: preserve-3d) {
  .flip-card-inner {
    position: relative;
  }
  
  .flip-card-back {
    display: none;
  }
  
  .flip-card-mobile.flipped .flip-card-front {
    display: none;
  }
  
  .flip-card-mobile.flipped .flip-card-back {
    display: block;
    transform: none;
  }
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}