<!DOCTYPE html>
<title>チョコchat</title>
<style>
body{margin:0;display:flex;flex-direction:column;height:100vh;font-family:sans-serif}
nav{height:50px;background:#1a1a2e;display:flex;align-items:center;padding:0 16px}
a{color:#fff;text-decoration:none;padding:8px;background:#8b4513;border-radius:8px;font-size:14px}
iframe{flex:1;border:0}
</style>
<nav><a href="/">🍫 チョコTubeに戻る</a></nav>
<iframe src="https://bbs-be-ta2-bl9w.onrender.com"></iframe>