YouTube Hover Copy Button Correct

Hover to show copy button on YouTube subscription videos
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// ==UserScript==
// @name         YouTube Hover Copy Button Correct
// @namespace    yt-copy
// @version      8.0
// @match        https://www.youtube.com/feed/subscriptions*
// @grant        none
// @description Hover to show copy button on YouTube subscription videos
// ==/UserScript==

(function() {
    'use strict';

    function injectButtons() {
        const items = document.querySelectorAll("ytd-rich-item-renderer");

        items.forEach(item => {
            if (item.querySelector(".yt-copy-btn")) return;

            const link = item.querySelector('a[href^="/watch"]');
            const thumbContainer = item.querySelector('a.yt-lockup-view-model__content-image');

            if (!link || !thumbContainer) return;

            const url = "https://www.youtube.com" + link.getAttribute("href");

            // 给缩略图容器 relative
            thumbContainer.style.position = "relative";

            // 创建按钮
            const btn = document.createElement("div");
            btn.className = "yt-copy-btn";
            btn.textContent = "复制";
            Object.assign(btn.style, {
                position: "absolute",
                top: "8px",
                right: "8px",
                background: "rgba(0,0,0,0.75)",
                color: "#fff",
                padding: "4px 8px",
                fontSize: "12px",
                borderRadius: "6px",
                cursor: "pointer",
                opacity: "0",
                transition: "opacity 0.15s",
                zIndex: "9999",
                pointerEvents: "auto"
            });

            btn.addEventListener("click", e => {
                e.preventDefault();
                e.stopPropagation();
                navigator.clipboard.writeText(url);
                btn.textContent = "已复制";
                setTimeout(() => btn.textContent = "复制", 1200);
            });

            thumbContainer.appendChild(btn);

            // ✅ 核心修复：hover 绑定在整个视频卡片
            item.addEventListener("mouseenter", () => btn.style.opacity = "1");
            item.addEventListener("mouseleave", () => btn.style.opacity = "0");
        });
    }

    // 无限滚动处理
    setInterval(injectButtons, 1500);

})();