参考サイト

function applyTheme(theme) {
let actualTheme;
if (theme === 'system') {
actualTheme = getSystemTheme();
} else {
actualTheme = theme;
}
window.document.documentElement.dataset.theme = actualTheme;
}

const storedTheme = localStorage.getItem('theme');
const theme = storedTheme || 'system';
applyTheme(theme);

// システムテーマの変更を監視
if (window.matchMedia) {
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function() {
const currentTheme = localStorage.getItem('theme') || 'system';
if (currentTheme === 'system') {
applyTheme('system');
}
});
}</script><script nonce="GazV6XFl7LZK1zSP0IJaucCB+78kViJeDvwRcttKD3A=">var newDataLayer = {};

// display_modeを追加
if (window.matchMedia('(display-mode: standalone)').matches) {
newDataLayer.display_mode = 'standalone'; // PWA
} else if (window.navigator.standalone === true) {
newDataLayer.display_mode = 'standalone'; // PWA on iOS Safari
} else {
newDataLayer.display_mode = 'browser'; // Web
}

// user_idを追加
// ページ初期化時に取得したいため、ローカルストレージからcachedUser.idを取得する
var zennCurrentUserValue = localStorage.getItem('zenn_current_user');
if (zennCurrentUserValue) {
try {
var currentUser = JSON.parse(zennCurrentUserValue);
if (currentUser.cachedUser) {
newDataLayer.user_id = currentUser.cachedUser.id;
}
} catch {}
}