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button:hover{background:#e0e0e0}.filter-buttons button.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.loading-state,.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;gap:1rem}.loading-state .spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}.loading-state p{color:#666;font-size:1rem}.empty-state svg{width:80px;height:80px;color:#ccc}.empty-state h3{font-size:1.5rem;color:#333;margin-top:.5rem}.empty-state p{color:#666;font-size:1rem;text-align:center;max-width:400px}@media (max-width: 768px){.header-content{flex-direction:column;align-items:flex-start;gap:1rem}.header-right{width:100%;justify-content:space-between}.dashboard-main{padding:1rem}.stats-grid{grid-template-columns:1fr}.messages-header{flex-direction:column;align-items:flex-start}.filter-buttons{width:100%;flex-wrap:wrap}.filter-buttons button{flex:1;min-width:100px}}.app{min-height:100vh;background:#f5f5f5}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:1rem}.spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #6B4EFF;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-container p{color:#666;font-size:1rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f5f5f5}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{min-height:100vh}