.App{display:flex;height:100%;width:100%;background:#0a0a0a;color:#e0e0e0;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif}.App.app-light{background:#fff;color:#222}.mobile-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:999;display:none}.sidebar-container{flex-shrink:0;height:100%;z-index:1000}.main-container{flex:1;display:flex;flex-direction:column;height:100%;overflow:hidden;transition:all .2s ease}.top-nav{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid #333;background:#1a1a1a;flex-shrink:0;height:60px;box-sizing:border-box}.app-light .top-nav{background:#fff;border-bottom:1px solid 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.chat-title-edit:focus{background:#fafafa;border-color:#0477d1}.new-chat-nav-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:#e0e0e0;cursor:pointer;transition:all .2s ease;padding:0}.new-chat-nav-btn:hover{background:#ffffff26;border-color:#ffffff4d;transform:translateY(-1px)}.new-chat-nav-btn:active{transform:translateY(0)}.nav-right{display:flex;align-items:center}.mobile-menu-btn,.desktop-collapse-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:transparent;border:1px solid #444;border-radius:6px;color:#e0e0e0;cursor:pointer;transition:all .2s ease}.mobile-menu-btn:hover,.desktop-collapse-btn:hover{background:#2a2a2a;border-color:#555}.app-light .mobile-menu-btn,.app-light .desktop-collapse-btn{border:1px solid rgb(227,227,227);color:#575757}.app-light .mobile-menu-btn:hover,.app-light 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solid #444;border-radius:6px;padding:6px 12px;cursor:pointer;font-size:12px;color:#e0e0e0;transition:all .2s ease}.logout-btn:hover{background:#333;border-color:#555}.app-light .logout-btn{border:1px solid rgb(227,227,227);color:#575757}.app-light .logout-btn:hover{background:#0477d10d;border-color:#0477d1;color:#0477d1}.logout-btn span{color:inherit}.chat-main{flex:1;overflow:hidden;display:flex;flex-direction:column}@media (min-width: 769px){.mobile-menu-btn{display:none}.desktop-collapse-btn{display:flex}}@media (max-width: 768px){.mobile-overlay{display:block}.sidebar-container{position:fixed;top:0;left:0;height:100%;transform:translate(-100%);transition:transform .3s ease;z-index:1000}.sidebar-container.open{transform:translate(0)}.main-container{width:100%}.top-nav{padding:12px 16px}.user-info-nav{padding:6px 12px;gap:12px}.logout-btn span,.username-nav{display:none}}@media (max-width: 480px){.top-nav{padding:8px 12px;height:56px}.user-info-nav{padding:4px 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