:root{--primary-color: #2563eb;--secondary-color: #4f46e5;--bg-color: #f3f4f6}body{margin:0;padding:0;box-sizing:border-box}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#888;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#555}