:root{--serif:"SHSerif","Source Han Serif SC","Noto Serif SC","Songti SC",serif;--sans:"PingFang SC","Lantinghei SC","Helvetica Neue",Helvetica,Arial,"Microsoft YaHei",sans-serif}
html{scroll-behavior:smooth}body{margin:0;font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased}