async function send() {
  const key = document.getElementById("apiKey").value;
  const model = document.getElementById("model").value;
  const prompt = document.getElementById("prompt").value;

  const res = await fetch("https://openrouter.ai/api/v1/chat/completions", {
    method: "POST",
    headers: {
      "Authorization": "Bearer " + key,
      "Content-Type": "application/json",
      "HTTP-Referer": "https://example.com"
    },
    body: JSON.stringify({
      model,
      messages: [{ role: "user", content: prompt }],
      temperature: 0.7
    })
  });

  const data = await res.json();
  document.getElementById("response").textContent =
    data.choices?.[0]?.message?.content || JSON.stringify(data, null, 2);
}