(function() {
    const stylesheetId = 'zeninternet-custom-styles';
    
    // Create or get our stylesheet element
    function getStylesheet() {
        let stylesheet = document.getElementById(stylesheetId);
        if (!stylesheet) {
            stylesheet = document.createElement('style');
            stylesheet.id = stylesheetId;
            stylesheet.type = 'text/css';
            document.head.appendChild(stylesheet);
        }
        return stylesheet;
    }
    
    // Update our stylesheet content
    function updateStyles(css) {
        const stylesheet = getStylesheet();
        stylesheet.textContent = css || '';
        console.log('ZenInternet: Styles were ' + (css ? 'updated' : 'removed'));
    }
    
    // Announce content script is ready and provide current hostname
    function announceReady() {
        browser.runtime.sendMessage({
            action: 'contentScriptReady',
            hostname: window.location.hostname,
        });
    }
    
    // Listen for messages from background script
    browser.runtime.onMessage.addListener((message) => {
        if (message.action === 'applyStyles') {
            updateStyles(message.css);
            return Promise.resolve({ success: true });
        }
        return false;
    });
    
    // Announce content script is ready on load
    announceReady();
})();