进行了一些小修复

assets/js/cms-download.js

@@ -228,14 +228,8 @@
 
 	// ===== 主流程 =====
 	function collectCaptchaPayload(sourceEl) {
-		// 优先从触发按钮所属的下载卡片中查找验证码容器（支持双下载框场景：侧栏+移动端）
-		var container = null;
-		if (sourceEl) {
-			var box = sourceEl.closest('.resource-download-box');
-			if (box) container = box.querySelector('[data-aksrt-download-captcha]');
-		}
-		// 回退到全局查找
-		if (!container) container = document.querySelector('[data-aksrt-download-captcha]');
+		const box = sourceEl ? sourceEl.closest('[data-aksrt-download-box]') : null;
+		const container = box ? box.querySelector('[data-aksrt-download-captcha]') : null;
 		if (!container) return {};
 		const out = {};
 		const keys = [
@@ -252,14 +246,14 @@
 		return out;
 	}
 
-	function isCaptchaActive() {
-		const card = document.querySelector('.resource-download-box');
+	function isCaptchaActive(sourceEl) {
+		const card = sourceEl ? sourceEl.closest('[data-aksrt-download-box]') : null;
 		if (!card) return false;
 		return card.getAttribute('data-captcha') === '1';
 	}
 
-	function ensureCaptchaThen(callback) {
-		if (!isCaptchaActive()) { callback(); return; }
+	function ensureCaptchaThen(sourceEl, callback) {
+		if (!isCaptchaActive(sourceEl)) { callback(); return; }
 		const state = window.AKSRTCaptchaState;
 		const scene = state && state.scenes && state.scenes.download;
 		if (!scene || typeof scene.verify !== 'function') {
@@ -274,7 +268,7 @@
 	}
 
 	function performDownloadRequest(button) {
-		const card = button.closest('.resource-download-box');
+		const card = button.closest('[data-aksrt-download-box]');
 		if (!card) return;
 		const postId = parseInt(card.getAttribute('data-post-id'), 10);
 		const sourceIndex = parseInt(button.getAttribute('data-source-index'), 10);
@@ -323,7 +317,7 @@
 	}
 
 	function requestDownload(button) {
-		ensureCaptchaThen(function () {
+		ensureCaptchaThen(button, function () {
 			performDownloadRequest(button);
 		});
 	}