Function transform

frontend/postcss.config.cjs:16–27

(prefix, selector)

      ? require("postcss-prefix-selector")({
          prefix: ".marimo",
          transform(prefix, selector) {
            // Global selectors → replace with prefix
            if (GLOBAL_SELECTORS.has(selector)) {
              return prefix;
            }
            // Already scoped under .marimo
            if (selector.startsWith(".marimo")) {
              return selector;
            }
            // Normal prefixing: .flex → .marimo .flex
            return `${prefix} ${selector}`;
          },
        })
      : undefined,
    process.env.NODE_ENV === "production" ? require("cssnano") : undefined,