        <small class="text-muted">✗ Advanced Analytics</small><br>
                        <small class="text-muted">✗ Priority Support</small><br>
                        <small class="text-muted">✗ Custom Themes</small>
                    `;
                    premiumIcon.style.display = 'none';
                }
            });

            // Dark mode switch (demo)
            const darkModeSwitch = document.getElementById('darkModeSwitch');
            darkModeSwitch.addEventListener('change',