【定制】全局样式与自定义样式

Requirements In most cases, it is enough to write a set of configurations. However, sometimes there are niche requirements, so we wrote a small piece of CSS, which was originally intended to be limited to individual articles, but there is currently no distinction between global styles and local styles. As a result, when reviewing articles, it is necessary to switch back and forth, which makes the browsing experience poor, and even we may forget what the configuration was like before. Let's add an option to control whether the current article uses a general style configuration or a custom style configuration. This configuration not only refers to "custom CSS", but also includes theme and color scheme options.