function speakText(text, lang = 'en-US') {    if ('speechSynthesis' in window) {        const utterance = new SpeechSynthesisUtterance(text);        utterance.lang = lang;                // Mevcut sesleri al        const voices = window.speechSynthesis.getVoices();                // İngilizce ses seç (Microsoft David, Google US English gibi)        const englishVoice = voices.find(voice =>            voice.lang.includes('en') &&            voice.name.includes('English')        );                if (englishVoice) {            utterance.voice = englishVoice;        }                // Konuşma hızı ve tonu ayarla        utterance.rate = 1.0;  // Normal hız        utterance.pitch = 1.0; // Normal ton                window.speechSynthesis.speak(utterance);    } else {        console.warn('SpeechSynthesis API not supported in this browser.');    } }