.virtualized-message-container{contain:layout style paint;will-change:transform}.virtualized-message-container *{overflow-anchor:none}@keyframes messageHighlight{0%{background-color:rgba(59,130,246,.2);transform:scale(1.01)}50%{background-color:rgba(59,130,246,.1)}to{background-color:transparent;transform:scale(1)}}.highlight-message{animation:messageHighlight 2s ease-in-out;border-radius:8px}.message-optimistic{opacity:.7;position:relative}.message-optimistic:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:repeating-linear-gradient(45deg,transparent,transparent 4px,rgba(255,255,255,.1) 0,rgba(255,255,255,.1) 8px);pointer-events:none;border-radius:inherit}.scroll-to-bottom-button{transition:all .2s ease-in-out;animation:bounceIn .3s ease-out;transform:scale(1)}@keyframes bounceIn{0%{opacity:0;transform:scale(.3) translateY(20px)}50%{opacity:.8;transform:scale(1.05)}to{opacity:1;transform:scale(1) translateY(0)}}.message-group{transition:opacity .2s ease-in-out}.message-group-enter{opacity:0;transform:translateY(10px)}.message-group-enter-active{opacity:1;transform:translateY(0);transition:opacity .3s ease-out,transform .3s ease-out}.message-group-exit{opacity:1}.message-group-exit-active{opacity:0;transform:translateY(-10px);transition:opacity .2s ease-in,transform .2s ease-in}.date-separator{position:sticky;top:0;z-index:10;backdrop-filter:blur(8px);background:rgba(255,255,255,.8);padding:8px 0;margin:16px 0}.dark .date-separator{background:rgba(0,0,0,.8)}.loading-more-indicator{display:flex;align-items:center;justify-content:center;padding:16px;opacity:.8}.loading-more-indicator .spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.message-bubble{contain:layout style;transform:translateZ(0)}.message-content{contain:layout style paint}.virtualized-scroll-container{contain:strict;overflow-anchor:none}.message-avatar{contain:layout style paint;transform:translateZ(0)}.file-attachment{contain:layout style;will-change:transform}.image-loading{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.dark .image-loading{background:linear-gradient(90deg,#2a2a2a 25%,#3a3a3a 50%,#2a2a2a 75%);background-size:200% 100%}.message-actions{opacity:0;transform:translateX(10px);transition:opacity .2s ease-out,transform .2s ease-out}.message-bubble:hover .message-actions{opacity:1;transform:translateX(0)}.reply-preview{animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.typing-indicator{contain:layout style paint;will-change:opacity}@media (max-width:768px){.message-actions,.message-bubble{transform:none}}@media (min-resolution:120dpi){.virtualized-message-container{will-change:scroll-position}}@media (prefers-reduced-motion:reduce){.highlight-message,.message-group-enter-active,.message-group-exit-active,.reply-preview,.scroll-to-bottom-button{animation:none;transition:none}}