body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f8ff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

h1 {
    color: #4A90E2;
    font-size: 2.5em;
    margin-bottom: 20px;
}

.chat-container {
    width: 80%;
    max-width: 600px;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-box {
    padding: 20px;
    height: 400px;
    overflow-y: auto;
    border-bottom: 1px solid #ddd;
    display: flex;
    flex-direction: column;
}

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

.chat-input input {
    flex: 1;
    padding: 15px;
    border: none;
    font-size: 16px;
    border-radius: 0 0 0 10px;
}

.chat-input button {
    padding: 15px;
    border: none;
    background: #4A90E2;
    color: white;
    cursor: pointer;
    font-size: 16px;
    border-radius: 0 0 10px 0;
}

.chat-input button:hover {
    background: #357ABD;
}

.message {
    margin: 10px 0;
    padding: 10px;
    border-radius: 10px;
    max-width: 80%;
}

.message.user {
    align-self: flex-end;
    background: #4A90E2;
    color: white;
}

.message.bot {
    align-self: flex-start;
    background: #f1f1f1;
    color: #333;
}

.message-time {
    font-size: 0.8em;
    color: #1378ca;
    text-align: right;
    margin-top: 5px;
}