:root{--sidebar-bg:#292929;--sidebar-icon:#b3b3b3;--sidebar-active:#6264a7;--panel-bg:#f5f5f5;--panel-border:#e0e0e0;--chat-bg:#fff;--msg-sent:#e8ebfa;--msg-sent-border:#6264a7;--msg-received:#f0f0f0;--primary:#6264a7;--primary-dark:#464775;--text-primary:#242424;--text-secondary:#616161;--text-light:#fff}*{box-sizing:border-box;margin:0;padding:0}body{color:var(--text-primary);font-family:Segoe UI,-apple-system,sans-serif}.mobile-tab-bar{background:var(--bg-sidebar,#292929);border-top:1px solid var(--panel-border,#e0e0e0);z-index:1000;justify-content:space-around;align-items:center;height:56px;display:flex;position:fixed;bottom:0;left:0;right:0}.mobile-tab-item{cursor:pointer;color:var(--sidebar-icon,#b3b3b3);flex-direction:column;justify-content:center;align-items:center;padding:4px 12px;transition:color .15s;display:flex}.mobile-tab-item.active{color:var(--primary,#6264a7)}@media (width<=768px){.mobile-fullscreen-view{flex:1;width:100%;height:calc(100vh - 56px);overflow-y:auto}.mobile-layout{flex-direction:column}.login-card{max-width:380px;width:90%!important;padding:24px!important}.profile-panel{width:100%!important;max-width:100%!important}.dialog-overlay .dialog-content{width:95%!important;max-width:100%!important;max-height:90vh!important}.chat-area-mobile p{font-size:15px!important}}