fix(single): place the video footer breadcrumb like the reference

Drop the invented .post-breadcrumbs wrapper and echo the breadcrumb
inside the reference's flex jsb at row; split .single-video .breadcrumb
out of the cover-overlay rule (-6px pull and opacity reset belong to
title-over-cover contexts only) and restore the legacy 15px footer
padding. Pin the structure in the cover contract test and rebuild the
homepage aggregates.

assets/css/build/homepage.css

@@ -839,12 +839,11 @@ ul.breadcrumb > li:last-child,
   color: var(--main-color, var(--color-ink-2, #4e5358));
 }
 
-/* Cover / video footer breadcrumb — legacy single-cover-con / single-video */
+/* Cover overlay breadcrumb — legacy .single-cover-con：标题叠加封面，
+   面包屑需要 -6px 左拉与不透明度还原。 */
 .single-cover-con .breadcrumb,
 .single-cover-con ul.breadcrumb,
-.single-cover-con .breadcrumb-nav,
-.post-breadcrumbs .breadcrumb,
-.single-video .breadcrumb {
+.single-cover-con .breadcrumb-nav {
   font-size: 13px;
   margin: 5px 0 0 -6px;
   opacity: unset;
@@ -852,6 +851,9 @@ ul.breadcrumb > li:last-child,
   background: transparent;
 }
 
+/* Video footer breadcrumb — legacy .single-video .breadcrumb：标题在下方
+   footer（flex jsb at 行）不叠加封面，只归零内边距，保留基础弱化样式
+   （opacity .6 与 12px 下边距），对齐 zibll main.css。 */
 .single-video .breadcrumb {
   padding: 0;
 }

assets/css/frontend/breadcrumb.css

@@ -69,12 +69,11 @@ ul.breadcrumb > li:last-child,
   color: var(--main-color, var(--color-ink-2, #4e5358));
 }
 
-/* Cover / video footer breadcrumb — legacy single-cover-con / single-video */
+/* Cover overlay breadcrumb — legacy .single-cover-con：标题叠加封面，
+   面包屑需要 -6px 左拉与不透明度还原。 */
 .single-cover-con .breadcrumb,
 .single-cover-con ul.breadcrumb,
-.single-cover-con .breadcrumb-nav,
-.post-breadcrumbs .breadcrumb,
-.single-video .breadcrumb {
+.single-cover-con .breadcrumb-nav {
   font-size: 13px;
   margin: 5px 0 0 -6px;
   opacity: unset;
@@ -82,6 +81,9 @@ ul.breadcrumb > li:last-child,
   background: transparent;
 }
 
+/* Video footer breadcrumb — legacy .single-video .breadcrumb：标题在下方
+   footer（flex jsb at 行）不叠加封面，只归零内边距，保留基础弱化样式
+   （opacity .6 与 12px 下边距），对齐 zibll main.css。 */
 .single-video .breadcrumb {
   padding: 0;
 }

assets/css/frontend/single-post/cover.css

@@ -50,13 +50,6 @@
     background: var(--color-bg-2, #f5f5f5);
 }
 
-/* ===== 面包屑 ===== */
-.post-breadcrumbs {
-    margin-bottom: 12px;
-    font-size: 13px;
-    color: var(--color-ink-4, var(--color-ink-4));
-}
-
 .article-title + .img-badge,
 .single-head-cover .img-badge.right,
 .article-header .img-badge.right {
@@ -101,7 +94,8 @@
 
 
 /* ===== Video footer (legacy single-video-footer) ===== */
-.single-head-cover .single-video-footer { padding: 12px 4px 4px; }
+/* 内边距沿用 legacy 契约 .single-video-footer{padding:15px}（与 zibll 一致），
+   面包屑在 flex jsb at 行首，不再额外包装。 */
 .single-head-cover .single-video-footer .article-title {
     font-size: clamp(1.1rem, 2.4vw, 1.45rem); font-weight: 700; margin: 8px 0 0; line-height: 1.35;
 }

inc/helpers/aksrt-single-render.php

@@ -38,9 +38,9 @@ if (!function_exists('aksrt_single_render_cover')) :
 						<div class="aksrt-video single-cover__player" data-aksrt-video data-src="<?php echo esc_url($ctx['cover_url']); ?>"<?php echo $poster !== '' ? ' data-poster="' . esc_url($poster) . '"' : ''; ?> style="position:absolute;inset:0;width:100%;height:100%;"></div>
 					</div>
 					<div class="single-video-footer dplayer-featured">
-						<?php if ($crumbs !== '') : ?>
-							<div class="post-breadcrumbs"><?php echo $crumbs; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?></div>
-						<?php endif; ?>
+						<div class="flex jsb at">
+							<?php echo $crumbs; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
+						</div>
 						<h1 class="article-title">
 							<?php
 							$episodes = is_array($ctx['video_episodes'] ?? null) ? $ctx['video_episodes'] : [];

tests/widget-system/single-cover-height-contract.test.cjs

@@ -123,6 +123,34 @@ test('video cover: play never runs against a sourceless player', () => {
   assert.doesNotMatch(player, /querySelectorAll\('\.switch-video, \.switch-iframe'\)/);
 });
 
+test('video cover: footer breadcrumb sits in the reference flex row', () => {
+  const breadcrumbCss = read('assets/css/frontend/breadcrumb.css');
+  const coverCss = read('assets/css/frontend/single-post/cover.css');
+
+  // 对齐 zibll：footer 里面包屑直接位于 flex jsb at 行，无自造包装层。
+  assert.match(
+    singleRender,
+    /single-video-footer dplayer-featured">\s*\n\s*<div class="flex jsb at">\s*\n\s*<\?php echo \$crumbs;/,
+    '视频 footer 面包屑必须在 flex jsb at 行内直出'
+  );
+  assert.doesNotMatch(
+    singleRender + breadcrumbCss + coverCss,
+    /post-breadcrumbs/,
+    '自造的 .post-breadcrumbs 包装层已死，禁止回归'
+  );
+
+  // 视频面包屑只归零 padding、保留基础弱化样式；-6px 左拉仅属封面叠加层。
+  assert.match(breadcrumbCss, /\.single-video \.breadcrumb \{\s*\n  padding: 0;\s*\n\}/);
+  assert.doesNotMatch(
+    breadcrumbCss,
+    /\.single-video \.breadcrumb,[\s\S]{0,200}margin: 5px 0 0 -6px/,
+    '.single-video 不得并入 -6px 叠加组，否则面包屑贴出左边界'
+  );
+
+  // footer 内边距恢复 legacy 15px 契约，禁止 4px 侧边距覆盖。
+  assert.doesNotMatch(coverCss, /\.single-video-footer \{ padding:/);
+});
+
 test('resource singles get the cover leaf versioned, never via the aggregate @import', () => {
   // 聚合文件的 @import 无版本号：浏览器会拿旧缓存（含已废弃的 .single-cover
   // padding 规则）把封面高度链挤成 0，资源型文章封面直接空白。