// ==UserScript==
// @name         Hide Promotion Advertisement at Zhihu Site
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Hide specific advertisement elements on Zhihu
// @author       aspen138
// @match        *://*.zhihu.com/*
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // Function to hide the advertisement elements
    function hideAds() {
        // Hide elements with class name 'Pc-word-card'
        var adElements1 = document.querySelectorAll('.Pc-word-card');
        adElements1.forEach(function(element) {
            element.style.display = 'none';
        });

        // Hide elements with class name 'Banner-link' (common in ads)
        var adElements2 = document.querySelectorAll('.Banner-link');
        adElements2.forEach(function(element) {
            element.style.display = 'none';
        });

        // Hide elements with class name 'Banner-adTag' (label for ads)
        var adElements3 = document.querySelectorAll('.Banner-adTag');
        adElements3.forEach(function(element) {
            element.style.display = 'none';
        });

        // Hide elements with class containing 'AdvertImg' (common in ads)
        var adElements4 = document.querySelectorAll('.AdvertImg');
        adElements4.forEach(function(element) {
            element.style.display = 'none';
        });

        // Hide iframe advertisements
        var adIframes = document.querySelectorAll('iframe[src*="baidu.com"]');
        adIframes.forEach(function(iframe) {
            iframe.style.display = 'none';
        });

        // Hide close button on ads (optional)
        var closeButtons = document.querySelectorAll('.Pc-card-button-close');
        closeButtons.forEach(function(button) {
            button.style.display = 'none';
        });
    }

    // Run the function to hide the elements when the page loads
    window.addEventListener('load', hideAds);

    // Observe the page for dynamic content loading and hide ads accordingly
    var observer = new MutationObserver(hideAds);
    observer.observe(document.body, { childList: true, subtree: true });
})();