*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}body{background:#f5f5f5;color:#333;font-family:Segoe UI,system-ui,sans-serif;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f0f0f0}::-webkit-scrollbar-thumb{background:#ccc;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#aaa}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}