body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

#app {
    width: 100%;
    max-width: 400px;
    background: white;
    padding: 20px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    text-align: center;
}

input {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #218838;
}

#chat-page {
    display: none;
}

#chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    margin-bottom: 10px;
}

#chat-messages {
    height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    background: #fafafa;
    border-radius: 5px;
}

#message-input {
    width: calc(100% - 22px);
}