/* ===================================================================
 * Lazy Loading Styles
 * =================================================================== */

/* Base class for lazy-loaded elements */
.lazy-load {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.blur-up {
    filter: blur(10px);
    transform: scale(1.05);
    transition: filter 0.6s ease, transform 0.6s ease;
}

.blur-up.loaded,
.blur-up:not(.lazy-load) {
    filter: blur(0);
    transform: scale(1);
}

/* Shimmer placeholder for background images */
.bg-placeholder {
    background-color: var(--bg-midnight-archive);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.bg-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg,
            var(--bg-midnight-archive) 0%,
            var(--bg-obsidian-veil) 50%,
            var(--bg-midnight-archive) 100%);
    animation: shimmer 2s infinite;
    z-index: 1;
}

@keyframes shimmer {
    0% {
        opacity: 0.3;
    }

    50% {
        opacity: 0.6;
    }

    100% {
        opacity: 0.3;
    }
}

.bg-loaded {
    animation: none;
}

.bg-loaded::before {
    display: none;
}

/* Fallback placeholder box */
.lazy-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    background-color: var(--bg-midnight-archive);
    color: var(--text-whispered-sigil);
    font-family: 'Libre Franklin', sans-serif;
    font-size: 1.1rem;
    border: 1px solid var(--border-silver-thread);
    border-radius: var(--radius-subtle);
    margin: 1rem 0;
}

/* Fade-in transition for loaded content */
.lazy-load.loaded {
    opacity: 1;
    transform: translateY(0);
}

.lazy-load:not(.loaded) {
    opacity: 0;
    transform: translateY(20px);
}

/* GPU acceleration for smoother animations */
img.lazy-load,
div.lazy-load {
    will-change: transform, filter, opacity;
    backface-visibility: hidden;
    perspective: 1000px;
}

@media (max-width: 768px) {
    .blur-up {
        filter: blur(8px);
        transform: scale(1.02);
    }

    .lazy-placeholder {
        min-height: 150px;
        font-size: 1rem;
    }
}

@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
    .blur-up {
        filter: blur(12px);
    }
}

/* Accessibility: Reduced motion */
@media (prefers-reduced-motion: reduce) {

    .blur-up,
    .lazy-load,
    .bg-placeholder::before {
        animation: none;
        transition: none;
    }

    .blur-up {
        filter: blur(5px);
    }
}