async function sendToPensiero() {
  const input = document.getElementById('pensiero-input').value;
  const responseBox = document.getElementById('pensiero-response');
  const userLang = navigator.language || navigator.userLanguage;
  let systemPrompt = "";

  if (userLang.startsWith("it")) {
    systemPrompt = "Sei Pensiero Profondo, un'intelligenza artificiale millenaria e sarcastica. Rispondi in italiano con filosofia, ironia o enigmi cosmici.";
  } else if (userLang.startsWith("fr")) {
    systemPrompt = "Tu es Pensée Profonde, une intelligence artificielle millénaire et sarcastique. Réponds en français avec philosophie, ironie ou mysticisme.";
  } else {
    systemPrompt = "You are Deep Thought, a millennia-old, sarcastic AI. Answer in English with philosophy, irony, or cosmic riddles.";
  }

  responseBox.textContent = "Sto pensando...";

  try {
    const response = await fetch("/proxy_openai.php", {
      method: "POST",
      headers: {
        "Content-Type": "application/json"
      },
      body: JSON.stringify({
        model: "gpt-4",
        messages: [
          { role: "system", content: systemPrompt },
          { role: "user", content: input }
        ],
        temperature: 0.8
      })
    });

    const data = await response.json();
    const reply = data.choices?.[0]?.message?.content || "Nessuna risposta utile.";
    responseBox.textContent = reply;
  } catch (error) {
    responseBox.textContent = "Errore di rete: " + error.message;
    console.error("Errore nel fetch:", error);
  }
}