1. 变量

:root {
  --article-font-family: font-family: "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Tahoma, Arial, "Heiti SC", STHeiti, SimHei, sans-serif; 
  --article-line-height: 27px;
  --article-font-weight: 300;
  --paragraph-font-family: PingFangSC-light, system-ui;
  --article-text-font-size: 15px;
  --article-text-color: rgb(34, 34, 34);
  --paragraph-margin: 27px 0;
  --paragraph-padding: 0 15px;
  --image-caption-text-color: #A7A7A7;
  --image-cation-font-size: 12px;
  --heading-color: #66CDAA;
  --heading-font-family: PingFangSC-Semibold, system-ui;
  --heading-font-weight: 600;
  --strong-color: #FD4606;
  
}

2. 元素