.portfolio-gallery__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  padding: 1rem 1rem;
}

.portfolio-filters {
  text-align: center;
  padding: 0;
}

.filter-btn {
  border-radius: 35px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.filter-btn:active {
  transform: scale(0.98);
}

.artwork-card {
  border-radius: 10px;
  overflow: hidden;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  width: 100%;
  max-width: 380px;
  will-change: transform;
}

.artwork-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.artwork-card__image-wrapper {
  position: relative;
  width: 100%;
  display: block;
  /* Add containment for better performance */
  contain: layout style paint;
}

.artwork-card__image {
  width: 100%;
  height: auto;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  display: block;
  /* Only animate transform, not all properties */
  transition: transform 0.3s ease;
  /* Hint browser this will transform */
  will-change: transform;
  /* Improve rendering */
  backface-visibility: hidden;
  transform: translateZ(0);
}

.artwork-card__image-wrapper:hover .artwork-card__image {
  transform: scale(1.03);
}

/* Overlay */
.artwork-card__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  opacity: 0;
  /* Use GPU-accelerated properties only */
  transition: opacity 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1rem;
  border-radius: 6px;
  box-sizing: border-box;
  z-index: 2;
  will-change: opacity;
  pointer-events: none; 
}

.artwork-card__image-wrapper:hover .artwork-card__overlay {
  opacity: 1;
  pointer-events: auto; 
}

.artwork-card__overlay-title {
  font-size: 1rem;
  text-rendering: optimizeLegibility;
}

.artwork-card__overlay-medium,
.artwork-card__overlay-size {
  font-size: 1rem;
}

.artwork-card__overlay-medium strong,
.artwork-card__overlay-size strong {
  color: var(--color-accent, #ffd700);
}

.artwork-card__overlay-sold {
  font-size: 1.2rem;
  font-weight: 600;
}

.sold-tag,
.featured-tag {
  display: none;
}

.floating-home-btn {
  position: fixed;
  top: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--color-accent, #ffd700);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
  color: #000;
}

.floating-home-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  .floating-home-btn {
    width: 45px;
    height: 45px;
    top: 1rem;
    right: 1rem;
  }
}

@keyframes fadeUp {
  0% {
    opacity: 0;
    /* Use transform for GPU acceleration */
    transform: translateY(15px) translateZ(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) translateZ(0);
  }
}

.artwork-card {
  opacity: 0;
  transform: translateY(15px) translateZ(0);
}

.artwork-card.visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}

.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
  z-index: 2000;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.lightbox.show {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.lightbox__image {
  max-width: 90%;
  max-height: 90%;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  will-change: transform;
  backface-visibility: hidden;
}

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  user-select: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
  backface-visibility: hidden;
}

.lightbox__close:hover {
  transform: scale(1.1);
  opacity: 0.8;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .artwork-card {
    transition: none;
  }

  .artwork-card__image {
    transition: none;
  }

  .artwork-card__overlay {
    transition: none;
  }
}

@media (max-width: 768px) {
  .portfolio-gallery__grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
  }

  .artwork-card__overlay-title {
    font-size: 1.3rem;
  }

  .artwork-card__overlay-medium,
  .artwork-card__overlay-size,
  .artwork-card__overlay-price {
    font-size: 0.95rem;
  }

  .artwork-card:hover {
    transform: none;
    box-shadow: none;
  }

  .artwork-card__image-wrapper:hover .artwork-card__image {
    transform: none;
  }

  .artwork-card__image-wrapper:active .artwork-card__overlay {
    opacity: 1;
  }
}

/* Performance optimization for many cards */
@media (min-width: 769px) {
  .artwork-card {
    contain: layout style paint;
  }
}