    <h2>Buttons</h2>
            <div class="demo-grid">
                <div class="demo-item">
                    <h3>Basic Buttons</h3>
                    <button class="fc-btn fc-btn-primary">Primary Button</button>
                    <button class="fc-btn fc-btn-secondary">Secondary Button</button>
                    <button class="fc-btn fc-btn-success">Success Button</button>
                    <button class="fc-btn fc-btn-danger">Danger Button</button>
                    <button class="fc-btn 