/* 轻量 Reset（保留焦点样式以提升无障碍） */
:root{--bg:#fff;--fg:#000}
*,*::before,*::after{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue","Noto Sans",Arial,"Microsoft Yahei";line-height:1.5;color:var(--fg);background:var(--bg);-webkit-font-smoothing:antialiased}
img,video,svg{max-width:100%;height:auto;display:block}
button,input,textarea,select{font:inherit}
a{color:inherit;text-decoration:none}
ol,ul{list-style:none;padding:0;margin:0}
table{border-collapse:collapse;border-spacing:0}
[hidden]{display:none!important}