body {
    font-family: Arial, sans-serif;
    background-color: #fefefe;
    color: #333;
    margin: 0;
    padding: 0;
}
header {
    background-color: #6a9fb5;
    color: white;
    padding: 1em;
    text-align: center;
}
nav a {
    margin: 0 1em;
    color: white;
    text-decoration: none;
}
footer {
    text-align: center;
    padding: 1em;
    background-color: #eee;
    margin-top: 2em;
}
main {
    padding: 2em;
}
#chatbox {
    border: 1px solid #ccc;
    height: 300px;
    overflow-y: scroll;
    padding: 1em;
    margin-bottom: 1em;
    background-color: #f9f9f9;
}
.chat-message {
    margin-bottom: 0.8em;
}
.chat-message.assistant {
    color: #006699;
}
.chat-message.user {
    text-align: right;
    color: #444;
}
input[type="text"] {
    width: 80%;
    padding: 0.5em;
}
button {
    padding: 0.5em 1em;
}