/* Mobile-first responsive design */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
}

header a {
    color: #fff;
    text-decoration: none;
}

header a:hover {
    text-decoration: underline;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.chat-container {
    width: 100%;
    max-width: 600px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    height: 80vh;
    max-height: 500px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    border-bottom: 1px solid #ddd;
}

.message {
    margin-bottom: 1rem;
}

.message.user {
    text-align: right;
}

.message.bot {
    text-align: left;
}

.chat-input-container {
    display: flex;
    padding: 1rem;
}

#user-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 0.5rem;
}

#send-button {
    padding: 0.5rem 1rem;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#send-button:hover {
    background-color: #0056b3;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .chat-container {
        height: 90vh;
    }
}