r(--fc-dark, #343a40);
            color: var(--fc-light, #f8f9fa);
            padding: 15px;
            border-radius: var(--fc-radius-base, 8px);
            font-family: 'SFMono-Regular', Monaco, Consolas, monospace;
            font-size: 14px;
            overflow-x: auto;
            margin: 10px 0;
        }
    </style>
</head>
<body>
    <!-- Theme Switcher -->
    <div class="theme-switcher">
        <button onclick="FC.theme.apply('default')">Default</button>
        <button onclick="FC.theme.a