(function() {
    function injectCSS(id, file) {
        if (!file) return;
        window.addEventListener("DOMNodeRemoved", function() {
            if (document.getElementById(id) == null) {
                const head = document.getElementsByTagName("head")[0];
                const link = document.createElement("link");
                link.id = id;
                link.rel = "stylesheet";
                link.type = "text/css";
                link.href = chrome.extension.getURL("css/" + file + ".css");
                link.media = "all";
                head.appendChild(link);
            }
        });
    }
    injectCSS("lezpluscss_main", "main");
    const stylesheets = {
        "/lez/tutor/review": "review",
        "/lez/tutor/solution": "solution",
    }
    injectCSS("lezpluscss_special", stylesheets[window.location.pathname]);
})()