/**
 * Photo Gallery Molecule
 *
 * Elegant, accessible photo gallery with lightbox modal for therapeutic space photos.
 * Features masonry layout, keyboard navigation, touch gestures, and smooth animations.
 *
 * @package HubTerapeutico
 * @since 1.0.0
 */

/* ============================================
   GALLERY GRID
   ============================================ */

.hub-photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-4);
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Tablet and larger - 3 columns */
@media (min-width: 768px) {
  .hub-photo-gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-5);
  }
}

/* Desktop - 4 columns */
@media (min-width: 1024px) {
  .hub-photo-gallery {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-6);
  }
}

/* ============================================
   GALLERY ITEM
   ============================================ */

.hub-photo-gallery__item {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-gray-100);
  cursor: pointer;
  transition: transform var(--transition-base), 
              box-shadow var(--transition-base);
}

.hub-photo-gallery__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hub-photo-gallery__item:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.hub-photo-gallery__item:active {
  transform: translateY(-2px);
}

/* ============================================
   GALLERY IMAGE
   ============================================ */

.hub-photo-gallery__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform var(--transition-slow);
}

.hub-photo-gallery__item:hover .hub-photo-gallery__image {
  transform: scale(1.05);
}

/* ============================================
   GALLERY OVERLAY
   ============================================ */

.hub-photo-gallery__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0%,
    rgba(0, 0, 0, 0) 50%,
    rgba(0, 0, 0, 0.7) 100%
  );
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-4);
}

.hub-photo-gallery__item:hover .hub-photo-gallery__overlay,
.hub-photo-gallery__item:focus .hub-photo-gallery__overlay {
  opacity: 1;
}

/* ============================================
   GALLERY CAPTION
   ============================================ */

.hub-photo-gallery__caption {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin: 0;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  transform: translateY(8px);
  transition: transform var(--transition-base);
}

.hub-photo-gallery__item:hover .hub-photo-gallery__caption,
.hub-photo-gallery__item:focus .hub-photo-gallery__caption {
  transform: translateY(0);
}

/* ============================================
   LIGHTBOX MODAL
   ============================================ */

.hub-photo-gallery-lightbox {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow),
              visibility var(--transition-slow),
              background-color var(--transition-slow);
  padding: var(--spacing-4);
  cursor: zoom-out;
}

.hub-photo-gallery-lightbox.is-open {
  opacity: 1;
  visibility: visible;
  background: rgba(0, 0, 0, 0.92);
}

/* Prevent body scroll when lightbox is open */
body.hub-photo-gallery-lightbox-open {
  overflow: hidden;
}

/* ============================================
   LIGHTBOX CONTAINER
   ============================================ */

.hub-photo-gallery-lightbox__container {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  transform: scale(0.9);
  transition: transform var(--transition-slow);
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__container {
  transform: scale(1);
}

/* ============================================
   LIGHTBOX IMAGE
   ============================================ */

.hub-photo-gallery-lightbox__image {
  max-width: 100%;
  max-height: 90vh;
  width: auto;
  height: auto;
  display: block;
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.hub-photo-gallery-lightbox__image.is-loaded {
  opacity: 1;
}

/* ============================================
   LIGHTBOX CONTROLS
   ============================================ */

/* Close button */
.hub-photo-gallery-lightbox__close {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  z-index: calc(var(--z-modal) + 1);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  line-height: 1;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast);
  opacity: 0;
  transform: translateY(-10px);
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__close {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 200ms;
}

.hub-photo-gallery-lightbox__close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: scale(1.1);
}

.hub-photo-gallery-lightbox__close:active {
  transform: scale(0.95);
}

.hub-photo-gallery-lightbox__close:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Navigation arrows */
.hub-photo-gallery-lightbox__nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: calc(var(--z-modal) + 1);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-white);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              opacity var(--transition-fast);
  opacity: 0;
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__nav {
  opacity: 1;
}

.hub-photo-gallery-lightbox__nav--prev {
  left: var(--spacing-4);
  transition-delay: 250ms;
}

.hub-photo-gallery-lightbox__nav--next {
  right: var(--spacing-4);
  transition-delay: 300ms;
}

.hub-photo-gallery-lightbox__nav:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-50%) scale(1.1);
}

.hub-photo-gallery-lightbox__nav--prev:hover {
  transform: translateY(-50%) translateX(-4px) scale(1.1);
}

.hub-photo-gallery-lightbox__nav--next:hover {
  transform: translateY(-50%) translateX(4px) scale(1.1);
}

.hub-photo-gallery-lightbox__nav:active {
  transform: translateY(-50%) scale(0.95);
}

.hub-photo-gallery-lightbox__nav:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.hub-photo-gallery-lightbox__nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.hub-photo-gallery-lightbox__nav:disabled:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-50%);
}

/* Mobile: Smaller navigation buttons */
@media (max-width: 767px) {
  .hub-photo-gallery-lightbox__nav,
  .hub-photo-gallery-lightbox__close {
    width: 40px;
    height: 40px;
    font-size: var(--font-size-lg);
  }

  .hub-photo-gallery-lightbox__nav--prev {
    left: var(--spacing-2);
  }

  .hub-photo-gallery-lightbox__nav--next {
    right: var(--spacing-2);
  }

  .hub-photo-gallery-lightbox__close {
    top: var(--spacing-2);
    right: var(--spacing-2);
  }
}

/* ============================================
   LIGHTBOX COUNTER
   ============================================ */

.hub-photo-gallery-lightbox__counter {
  position: fixed;
  top: var(--spacing-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: calc(var(--z-modal) + 1);
  padding: var(--spacing-2) var(--spacing-4);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  opacity: 0;
  transform: translateX(-50%) translateY(-10px);
  transition: opacity var(--transition-base),
              transform var(--transition-base);
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__counter {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  transition-delay: 150ms;
}

@media (max-width: 767px) {
  .hub-photo-gallery-lightbox__counter {
    top: var(--spacing-2);
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
  }
}

/* ============================================
   LIGHTBOX CAPTION
   ============================================ */

.hub-photo-gallery-lightbox__caption {
  position: fixed;
  bottom: var(--spacing-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: calc(var(--z-modal) + 1);
  max-width: 600px;
  padding: var(--spacing-3) var(--spacing-5);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  color: var(--color-white);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: center;
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
  transition: opacity var(--transition-base),
              transform var(--transition-base);
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__caption {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  transition-delay: 200ms;
}

@media (max-width: 767px) {
  .hub-photo-gallery-lightbox__caption {
    bottom: var(--spacing-2);
    max-width: calc(100% - var(--spacing-8));
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
  }
}

/* ============================================
   LOADING STATE
   ============================================ */

.hub-photo-gallery-lightbox__loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.hub-photo-gallery-lightbox__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: hub-spinner-rotate 0.8s linear infinite;
}

@keyframes hub-spinner-rotate {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   TOUCH GESTURES & SWIPE INDICATOR
   ============================================ */

.hub-photo-gallery-lightbox__container.is-swiping {
  transition: none;
}

.hub-photo-gallery-lightbox__container.is-swiping-left {
  transform: translateX(-50px) scale(0.98);
}

.hub-photo-gallery-lightbox__container.is-swiping-right {
  transform: translateX(50px) scale(0.98);
}

/* ============================================
   KEYBOARD HINTS (Optional)
   ============================================ */

.hub-photo-gallery-lightbox__hints {
  position: fixed;
  bottom: var(--spacing-20);
  left: 50%;
  transform: translateX(-50%);
  z-index: calc(var(--z-modal) + 1);
  display: flex;
  gap: var(--spacing-3);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.hub-photo-gallery-lightbox.is-open .hub-photo-gallery-lightbox__hints {
  opacity: 0.6;
  transition-delay: 1s;
}

.hub-photo-gallery-lightbox__hints:hover {
  opacity: 0;
}

.hub-photo-gallery-lightbox__hint {
  padding: var(--spacing-1) var(--spacing-2);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

@media (max-width: 767px) {
  .hub-photo-gallery-lightbox__hints {
    display: none;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus visible enhancements */
.hub-photo-gallery__item:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .hub-photo-gallery__item,
  .hub-photo-gallery__image,
  .hub-photo-gallery__overlay,
  .hub-photo-gallery__caption,
  .hub-photo-gallery-lightbox,
  .hub-photo-gallery-lightbox__container,
  .hub-photo-gallery-lightbox__image,
  .hub-photo-gallery-lightbox__close,
  .hub-photo-gallery-lightbox__nav,
  .hub-photo-gallery-lightbox__counter,
  .hub-photo-gallery-lightbox__caption {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* Screen reader only text */
.hub-photo-gallery__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;
}