body{font-family:Arial,sans-serif;background:#f5f7fb}#chat-toggle{position:fixed;bottom:20px;right:20px;width:60px;height:60px;border-radius:50%;background:#4a90e2;color:#fff;display:flex;align-items:center;justify-content:center;font-size:28px;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.2)}#chat-window{position:fixed;bottom:90px;right:20px;width:360px;height:520px;border-radius:16px;box-shadow:0 6px 20px rgba(0,0,0,.15);display:none;flex-direction:column;overflow:hidden;background:#fff}#chat-header{background:#4a90e2;padding:16px;color:#fff;font-weight:bold;display:flex;gap:10px;align-items:center}#chat-box{flex:1;padding:15px;overflow-y:auto;background:#f0f3f9}.msg{max-width:80%;padding:10px 14px;border-radius:14px;margin-bottom:12px;font-size:15px;line-height:1.4}.user{margin-left:auto;background:#4a90e2;color:#fff;border-bottom-right-radius:2px}.bot{background:#fff;color:#333;border-bottom-left-radius:2px;box-shadow:0 2px 6px rgba(0,0,0,.08)}#chat-input{display:flex;padding:10px;background:#fff;border-top:1px solid #ddd}#chat-input input{flex:1;padding:10px;border-radius:10px;border:1px solid #ccc}#chat-input button{margin-left:10px;padding:10px 16px;border-radius:10px;border:none;background:#4a90e2;color:#fff;cursor:pointer}