diff --git a/app/builder.py b/app/builder.py
index c33af61..8ded6b9 100644
--- a/app/builder.py
+++ b/app/builder.py
@@ -38,7 +38,8 @@ def output_path(dist,route):
 
 def copy_blocks_css(theme_dir,dist_assets):
     """Theme-provided blocks.css wins; platform default is the fallback."""
-    src=theme_dir/'blocks.css' if (theme_dir/'blocks.css').is_file() else ROOT/'app'/'static'/'blocks.css'
+    candidate=theme_dir/'blocks.css'
+    src=candidate if candidate.is_file() else ROOT/'app'/'static'/'blocks.css'
     shutil.copy2(src,dist_assets/'blocks.css')
 
 def link(path):
diff --git a/docs/superpowers/plans/2026-10-22-trade-pro-theme-port.md b/docs/superpowers/plans/2026-10-22-trade-pro-theme-port.md
index 817b5cc..af6d253 100644
--- a/docs/superpowers/plans/2026-10-22-trade-pro-theme-port.md
+++ b/docs/superpowers/plans/2026-10-22-trade-pro-theme-port.md
@@ -362,7 +362,7 @@ def test_theme_color_map_covers_trade_pro():
 ### Task 12: 预设、编辑器与全量验收（Phase 4）
 
 - [ ] `page-presets.json` 13 种按 cms 首页/产品页实际区块结构重写（编辑器初始布局与真实设计一致）
-- [ ] 编辑器验证：hero/cta/features/collection/attributes 在 trade-pro 下可编辑、预览、保存草稿、发布（spec §6）
+- [ ] 编辑器验证：hero/cta/features/collection/attributes 在 trade-pro 下可编辑、预览、保存草稿、发布（spec §6）。**已知观察（Task 4 质量审查）**：main.py 编辑器侧读平台版 blocks.css，而构建产物可能用主题版——编辑器预览与最终站点可能样式不一致；本项验收时确认影响，必要时编辑器预览也走主题版
 - [ ] 全站设计草稿验证：页眉/页脚/导航配置生效（显式值渲染、中文默认被值比对替换为英文兜底）
 - [ ] 全量回归：`python -m pytest -q`（≥210+新增全绿）、`node --check` 全部 JS
 - [ ] 实战验收：站点 483295c29ea0 最终构建 ≥203 页零错误；视觉对照两层标准（spec §6）逐页记录
diff --git a/tests/test_theme_registry.py b/tests/test_theme_registry.py
index 6941b98..30fd719 100644
--- a/tests/test_theme_registry.py
+++ b/tests/test_theme_registry.py
@@ -99,8 +99,8 @@ def test_theme_blocks_css_overrides_platform(tmp_path):
     (theme_dir / 'blocks.css').write_text('/* theme version */', encoding='utf-8')
     builder.copy_blocks_css(theme_dir, dist)
     assert (dist / 'blocks.css').read_text(encoding='utf-8') == '/* theme version */'
-    # 无主题版时回落平台版
+    # 无主题版时回落平台版（精确断言内容一致）
     dist2 = tmp_path / 'assets2'; dist2.mkdir()
     builder.copy_blocks_css(tmp_path / 'nonexistent', dist2)
-    assert (dist2 / 'blocks.css').is_file()
-    assert (dist2 / 'blocks.css').read_text(encoding='utf-8') != '/* theme version */'
+    platform = (builder.ROOT / 'app' / 'static' / 'blocks.css').read_text(encoding='utf-8')
+    assert (dist2 / 'blocks.css').read_text(encoding='utf-8') == platform