fix: 添加禁用状态样式和逻辑，防止无效点击

public/themes/dist_static/static/css/product.css

@@ -139,6 +139,10 @@
   background: var(--color-primary);
   color: var(--color-white);
 }
+.p-subnav__cta.disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
 
 body.is-p-subnav .site-header {
   transform: translateY(-100%);

public/themes/dist_static/static/js/product.js

@@ -140,6 +140,7 @@ function selectionModalInit() {
 	};
 	document.querySelectorAll("[data-selection-trigger]").forEach((trigger) => {
 		trigger.addEventListener("click", (event) => {
+			if (trigger.classList.contains("disabled")) return;
 			event.preventDefault();
 			open();
 		});

public/themes/website/1/zh/demo/product.html

@@ -147,7 +147,7 @@
           <a class="p-subnav__link" href="#p-download" data-p-nav="p-download" role="listitem">资料下载</a>
           <a class="p-subnav__link" href="#p-related" data-p-nav="p-related" role="listitem">相关产品</a>
         </div>
-        <a class="p-subnav__cta" href="#p-spec" data-selection-trigger>查看选型表</a>
+        <a class="p-subnav__cta {if empty($content)}disabled{/if}" href="#p-spec" data-selection-trigger>查看选型表</a>
       </div>
     </nav>
 
@@ -155,7 +155,7 @@
       <section class="p-hero section__wrap">
         <div class="p-hero__inner">
           <h1 class="section__title">{$title}</h1>
-          <a class="s-btn s-btn--light s-btn--pill" href="#p-spec" data-selection-trigger>查看选型表</a>
+          <a class="s-btn s-btn--light s-btn--pill {if empty($content)}disabled{/if}" href="javascript:;" data-selection-trigger>查看选型表</a>
           <div class="p-hero__media">
             <div class="p-hero__mark" aria-hidden="true">{$sub_title}</div>
             <img src="/{:deal_image_url($thumbnail_url)}" width="434" height="601" alt="RA3系列伺服驱动器" />