body{margin:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#f0f2f5}.main-container{min-height:100vh;display:flex;flex-direction:column;justify-content:space-between}.header{text-align:center;padding:30px 20px 10px}.title{margin:0;font-size:28px;color:#333}.description{color:#666;font-size:14px}.chat-container{max-width:600px;margin:20px auto;background:#fff;border-radius:12px;box-shadow:0 8px 16px #0000001a;display:flex;flex-direction:column;overflow:hidden}.conversation{flex:1;padding:20px;overflow-y:auto}.message{margin:10px 0;padding:12px;border-radius:8px;line-height:1.4}.message.user{background:#e0f7fa;text-align:right}.message.assistant{background:#f1f1f1}.typing{font-style:italic}.input-area{display:flex;border-top:1px solid #eee;padding:10px}.input-message{flex:1;padding:10px;border:1px solid #ddd;border-radius:8px;outline:none;font-size:14px}.send-btn{background:#007bff;border:none;color:#fff;padding:0 16px;margin-left:10px;border-radius:8px;cursor:pointer;font-size:20px;display:flex;align-items:center;justify-content:center;transition:background .3s ease}.send-btn:hover{background:#0056b3}.footer{text-align:center;padding:20px;font-size:12px;color:#888}.footer-link{color:#007bff;text-decoration:none}.footer-link:hover{text-decoration:underline}