*{box-sizing:border-box;margin:0;padding:0;font-family:Arial,sans-serif}body{background:#f4f6f9}.container{width:90%;max-width:1200px;margin:auto}.card{background:#fff;border-radius:10px;padding:20px;box-shadow:0 2px 10px #0000001a}.btn{cursor:pointer;color:#fff;background:#2563eb;border:none;border-radius:5px;padding:10px 20px}.btn:hover{opacity:.9}.input{border:1px solid #ccc;border-radius:5px;width:100%;margin-top:10px;margin-bottom:15px;padding:10px}.center{justify-content:center;align-items:center;min-height:100vh;display:flex}.flex{gap:10px;display:flex}.navbar{color:#fff;background:#2563eb;margin-bottom:20px;padding:15px}.chat-container{background:#fff;border-radius:10px;width:700px;margin:30px auto;overflow:hidden;box-shadow:0 2px 10px #0000001a}.chat-header{color:#fff;background:#2563eb;padding:15px;font-weight:700}.chat-body{background:#f8fafc;height:500px;padding:20px;overflow-y:auto}.bot-message{background:#e5e7eb;border-radius:10px;width:fit-content;max-width:70%;margin-bottom:10px;padding:10px}.user-message{color:#fff;background:#2563eb;border-radius:10px;width:fit-content;max-width:70%;margin-bottom:10px;margin-left:auto;padding:10px}.chat-input{gap:10px;padding:10px;display:flex}.chat-input input{flex:1;padding:10px}