function isTelegram() {
    return !!(
        window.TelegramWebview ||
        (window.Telegram?.WebApp) ||
        /Telegram/i.test(navigator.userAgent || '')
    );
}


function isFacebook() {
    const ua = navigator.userAgent || '';
    return /FBAN|FBAV/i.test(ua);
}

function isEmbeddedBrowser() {
    return isTelegram() || isFacebook();
}