*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;background:#f0f2f5;color:#1a1f2e;font-size:14px;line-height:1.6;min-height:100vh}button{cursor:pointer}a{color:inherit;text-decoration:none}