@layer

https://ishadeed.com/article/cascade-layers/

CSS 级联：

• Origin and Importance
• Inline Styles
• Layer
• Specificity
• Order of appearance

样式规则优先级：

• Important Browser Styles
• Important User Styles
• Important Developer Declarations
• Normal Developer Styles
• Normal User Styles
• Normal Browser Styles

layer 覆盖会忽略内部选择器权重

将第三方 css 分配给 layer: @import url(flickity.css) layer(vendors);