/**
 * 🚀 Fast Gallery CSS - Optimized styles for smooth image transitions
 */

/* Image loading states */
.gallery-image {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, filter;
}

.gallery-image.loading {
    opacity: 0.6;
    filter: blur(1px);
}

.gallery-image.loaded {
    opacity: 1;
    filter: none;
}

/* Loading spinner */
.gallery-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.gallery-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(59, 130, 246, 0.3);
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    animation: gallery-spin 1s linear infinite;
}

@keyframes gallery-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Progressive loading placeholder */
.gallery-placeholder {
    background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
    background-size: 200% 100%;
    animation: gallery-shimmer 1.5s infinite;
}

@keyframes gallery-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Smooth navigation arrows */
.gallery-nav-arrow {
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.gallery-nav-arrow:hover {
    background-color: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

.gallery-nav-arrow:active {
    transform: scale(0.95);
}

/* Dot navigation improvements */
.gallery-dots {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    padding: 8px 12px;
}

.gallery-dot {
    transition: all 0.2s ease;
    cursor: pointer;
}

.gallery-dot:hover {
    transform: scale(1.2);
}

.gallery-dot.active {
    background-color: #3b82f6 !important;
    transform: scale(1.3);
}

/* Fullscreen optimizations */
.gallery-fullscreen {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.gallery-fullscreen img {
    transition: opacity 0.3s ease;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Touch feedback */
.gallery-touchable {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

/* Performance optimizations */
.gallery-container {
    contain: layout style paint;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

.gallery-image-container {
    position: relative;
    overflow: hidden;
    contain: layout style paint;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .gallery-nav-arrow {
        width: 44px;
        height: 44px;
    }
    
    .gallery-dot {
        width: 12px;
        height: 12px;
    }
    
    .gallery-dots {
        padding: 6px 10px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .gallery-image {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
    .gallery-image,
    .gallery-nav-arrow,
    .gallery-dot {
        transition: none;
    }
    
    .gallery-spinner {
        animation: none;
    }
    
    .gallery-placeholder {
        animation: none;
        background: #4b5563;
    }
}

/* Error state */
.gallery-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: #9ca3af;
    background: #374151;
    border-radius: 8px;
    padding: 2rem;
}

.gallery-error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.gallery-error-message {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.gallery-error-hint {
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Loading states for different image sizes */
.gallery-thumb-loading {
    background: #4b5563;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.gallery-thumb-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: gallery-loading-slide 1.5s infinite;
}

@keyframes gallery-loading-slide {
    0% { left: -100%; }
    100% { left: 100%; }
}