:root{--primary-color: #3b82f6;--bg-color: #f5f5f5;--chat-bg: #ffffff;--text-color: #333333;--border-color: #e5e7eb}*{margin:0;padding:0;box-sizing:border-box}html,body,#app{width:100%;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif}#app{display:flex;flex-direction:column}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a8a8a8}