.lazy-loading{opacity:0;transition:opacity .3s ease-in-out}.lazy-loading.loaded{opacity:1}.skeleton{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:skeleton-loading 1.5s infinite}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.blur-placeholder{filter:blur(10px);transform:scale(1.1);transition:filter .3s ease-out,transform .3s ease-out}.blur-placeholder.loaded{filter:blur(0);transform:scale(1)}.progressive-image{position:relative;overflow:hidden}.progressive-image img{transition:opacity .3s ease-in-out}.progressive-image img.low-quality{filter:blur(2px);opacity:.7}.progressive-image img.high-quality{filter:blur(0);opacity:1}.video-lazy-container{position:relative;background:#f0f0f0;display:flex;align-items:center;justify-content:center}.video-lazy-container.loaded{background:transparent}.loading-spinner{width:40px;height:40px;border:3px solid #f3f3f3;border-top-color:#3498db;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@supports not (aspect-ratio:16/9){.aspect-ratio-fallback{position:relative;padding-bottom:56.25%}.aspect-ratio-fallback>*{position:absolute;top:0;left:0;width:100%;height:100%}}@media (prefers-reduced-motion:reduce){.blur-placeholder,.lazy-loading,.progressive-image img{transition:none}.loading-spinner,.skeleton{animation:none}}@media (prefers-contrast:high){.skeleton{background:#000}.loading-spinner{border-color:#fff #000 #000}}@media print{.lazy-loading,.loading-spinner,.skeleton{display:none!important}}