body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #333;
}

.chat-container {
    width: 90%;
    max-width: 600px;
    height: 80vh;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: #667eea;
    color: #fff;
    padding: 20px;
    text-align: center;
    border-radius: 10px 10px 0 0;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f9f9f9;
}

.message {
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 20px;
    max-width: 70%;
    word-wrap: break-word;
}

.bot-message {
    background: #667eea;
    color: #fff;
    align-self: flex-start;
    margin-right: auto;
}

.user-message {
    background: #e1e1e1;
    color: #333;
    align-self: flex-end;
    margin-left: auto;
}

.chat-input {
    display: flex;
    padding: 20px;
    background: #fff;
    border-top: 1px solid #ddd;
}

#user-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 20px;
    outline: none;
    margin-right: 10px;
}

#send-button {
    padding: 10px 20px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s;
}

#send-button:hover {
    background: #5a67d8;
}

@media (max-width: 600px) {
    .chat-container {
        width: 95%;
        height: 90vh;
    }
    .message {
        max-width: 85%;
    }
}