body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
    color: #333;
    text-align: center;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    color: #00B900; /* LINE Green */
}

.hidden {
    display: none;
}

#profile img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin-bottom: 10px;
}

#displayName {
    font-weight: bold;
    font-size: 1.2em;
    margin: 5px 0;
}

#statusMessage {
    color: #666;
    font-size: 0.9em;
}

button {
    background-color: #00B900;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 1em;
    cursor: pointer;
    margin-top: 20px;
}

button:hover {
    background-color: #009900;
}