.performance-critical{visibility:visible;opacity:1}.preload-hidden{visibility:hidden;opacity:0;transition:opacity .3s ease-in-out,visibility .3s ease-in-out}.preload-visible{visibility:visible;opacity:1}.font-display-swap{font-display:swap}.layout-stable{contain:layout}.performance-animation{will-change:transform;transform:translateZ(0)}.performance-indicator{position:fixed;top:10px;right:10px;background:rgba(0,0,0,.8);color:white;padding:5px 10px;border-radius:4px;font-size:12px;z-index:9999;display:none}.performance-indicator.show{display:block}.loading-skeleton{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:loading 1.5s infinite}@keyframes loading{0%{background-position:200% 0}to{background-position:-200% 0}}.image-optimized{image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges}.paint-optimized{contain:paint}.scroll-optimized{overflow-anchor:auto}.critical-path{contain:layout style paint}