diff --git a/server/src/window/candidate_presenter.cpp b/server/src/window/candidate_presenter.cpp
index 7b2c889c..80ab5b66 100644
--- a/server/src/window/candidate_presenter.cpp
+++ b/server/src/window/candidate_presenter.cpp
@@ -109,6 +109,8 @@ struct CandSkinTokens
     float itemExtraHeight = 2.0f;
     float itemPadLeft = 0.0f;
     float itemPadRight = 0.0f;
+    // 横排时把卡片多出的宽度均分给同一行各项，铺满高亮的皮肤（杨柳青）末项才能贴到卡片右边。
+    bool justifyRows = false;
     msimeui::Thickness preeditMargin{};
     D2D1_COLOR_F rowTextSelected = D2D1::ColorF(0, 0.0f);
     D2D1_COLOR_F rowLabelSelected = D2D1::ColorF(0, 0.0f);
@@ -424,6 +426,7 @@ void CandidatePresenter::ApplySkin()
         tokens.itemRadius = 0.0f;
         tokens.outerItemRadius = 9.0f;
         tokens.itemGap = 0.0f;
+        tokens.justifyRows = true;
         // 行内边距对齐 CSS 的 .row.cand padding（加上 .text 的左内边距），预编辑行对齐 .row.pinyin。
         if (GetConfiguredCandidateWindowLayout() == "horizontal")
         {
@@ -620,6 +623,9 @@ void CandidatePresenter::ApplySkin()
     appearance.annotationFontSize = fontSize;
     appearance.contentPadLeft = tokens.itemPadLeft;
     appearance.contentPadRight = tokens.itemPadRight;
+    // itemExtraHeight 上下各半：横排翻译换到第二行时从下半段内边距上方开始，内边距留在翻译下面，
+    // 对应 CSS 里 .row.cand 的 padding 包住整个 .text（杨柳青横排上下各 6px）。
+    appearance.contentPadBottom = tokens.itemExtraHeight * 0.5f;
     appearance.textPadLeft = 5.0f;
     appearance.labelGap = 1.5f;
     appearance.selectedBarWidth = 3.0f;
@@ -631,6 +637,7 @@ void CandidatePresenter::ApplySkin()
     const bool preeditHidden = GetConfiguredCandidateWindowPreeditStyle() == "empty";
     appearance.outerCornerRadius = tokens.outerItemRadius;
     appearance.outerTopCornersEnabled = preeditHidden;
+    appearance.justifyHorizontalRows = tokens.justifyRows;
     // 隐藏的预编辑行高度为 0，但 body 仍在它和列表之间留 2px 行距；贴角皮肤把它抵掉，
     // 让首项贴着卡片的内容顶边（秋桂四边内边距一致，杨柳青高亮直抵卡片顶边）。
     if (preeditHidden)
diff --git a/ui/include/msimeui/Controls.h b/ui/include/msimeui/Controls.h
index f83f9e9b..87e73466 100644
--- a/ui/include/msimeui/Controls.h
+++ b/ui/include/msimeui/Controls.h
@@ -530,8 +530,16 @@ class CandidateList : public Visual
         // row) sits between the list and the frame's top edge.
         float outerCornerRadius = 0.0f;
         bool outerTopCornersEnabled = true;
+        // Horizontal only: when the list is arranged wider than a line of
+        // items, spread the spare width evenly over that line's items so the
+        // last one reaches the list's right edge (full-bleed highlights).
+        bool justifyHorizontalRows = false;
         float contentPadLeft = 5.0f;
         float contentPadRight = 5.0f;
+        // Part of itemHeight that is the row's bottom padding. Lines stacked
+        // under the first one (wrapped annotation, horizontal translation)
+        // start above it, and the padding is restored below the last line.
+        float contentPadBottom = 0.0f;
         float textPadLeft = 0.0f;
         float labelGap = 1.5f;
         float selectedBarWidth = 3.0f;
diff --git a/ui/src/CandidateList.cpp b/ui/src/CandidateList.cpp
index 55939081..d25fcc98 100644
--- a/ui/src/CandidateList.cpp
+++ b/ui/src/CandidateList.cpp
@@ -325,6 +325,10 @@ CandidateList::ItemGeometry CandidateList::MeasureItem(size_t index, float width
     geometry.text = {textX, 0.0f, textW, textH};
     float height = textH;
     float lineEnd = textW;
+    // height 末尾属于行底内边距的部分：只有单行高度（itemHeight）里才含这段内边距，
+    // 换到下方的辅助码和翻译从它上面开始排，排完再把它补回最后一行下面。
+    const float padBottom = std::clamp(appearance_.contentPadBottom, 0.0f, appearance_.itemHeight * 0.5f);
+    float padBelow = textH > appearance_.itemHeight ? 0.0f : padBottom;
 
     // 短字段保持原有并排方式；空间不足时让辅助码和翻译完整换行。
     if (!item.annotation.empty())
@@ -334,9 +338,13 @@ CandidateList::ItemGeometry CandidateList::MeasureItem(size_t index, float width
         const bool inlineAnnotation = lineEnd + 4.0f + annotationW <= contentWidth;
         const float annotationH = std::max(
             appearance_.itemHeight, MeasureTextHeight(item.annotation, appearance_.annotationFontSize, annotationW));
-        geometry.annotation = {textX + (inlineAnnotation ? lineEnd + 4.0f : 0.0f), inlineAnnotation ? 0.0f : height,
-                               annotationW, annotationH};
-        height = std::max(height, geometry.annotation.y + annotationH);
+        geometry.annotation = {textX + (inlineAnnotation ? lineEnd + 4.0f : 0.0f),
+                               inlineAnnotation ? 0.0f : height - padBelow, annotationW, annotationH};
+        if (geometry.annotation.y + annotationH > height)
+        {
+            height = geometry.annotation.y + annotationH;
+            padBelow = annotationH > appearance_.itemHeight ? 0.0f : padBottom;
+        }
         lineEnd = geometry.annotation.x - textX + annotationW;
     }
     if (!item.translation.empty())
@@ -353,9 +361,9 @@ CandidateList::ItemGeometry CandidateList::MeasureItem(size_t index, float width
                 : (naturalTranslationWidth <= contentWidth
                        ? fontSize * 1.25f
                        : std::max(fontSize * 1.25f, MeasureTextHeight(item.translation, fontSize, translationW)));
-        geometry.translation = {textX + (inlineTranslation ? lineEnd + gap : 0.0f), inlineTranslation ? 0.0f : height,
-                                translationW, translationH};
-        height = std::max(height, geometry.translation.y + translationH);
+        geometry.translation = {textX + (inlineTranslation ? lineEnd + gap : 0.0f),
+                                inlineTranslation ? 0.0f : height - padBelow, translationW, translationH};
+        height = std::max(height, geometry.translation.y + translationH + (inlineTranslation ? 0.0f : padBelow));
     }
     geometry.bounds = {0.0f, 0.0f, width, height};
     return geometry;
@@ -377,6 +385,26 @@ RectF CandidateList::ItemRect(size_t index) const
         rect.x = bounds_.x;
         rect.width = bounds_.width;
     }
+    else if (appearance_.justifyHorizontalRows)
+    {
+        // 横排铺满：列表比这一行的自然宽度宽时（卡片保持了同一输入下更宽的尺寸），把多出的宽度
+        // 均分给这一行的每一项，末项右边贴着列表右边，高亮不会在行尾留下一截空白。
+        const float lineY = itemGeometry_[index].bounds.y;
+        size_t first = index;
+        while (first > 0 && itemGeometry_[first - 1].bounds.y == lineY)
+            --first;
+        size_t last = index;
+        while (last + 1 < itemGeometry_.size() && itemGeometry_[last + 1].bounds.y == lineY)
+            ++last;
+        const RectF &tail = itemGeometry_[last].bounds;
+        const float extra = bounds_.width - (tail.x + tail.width);
+        if (extra > 0.0f)
+        {
+            const float share = extra / static_cast<float>(last - first + 1);
+            rect.x += share * static_cast<float>(index - first);
+            rect.width += share;
+        }
+    }
     return rect;
 }
 
diff --git a/ui/tests/src/test_layout.cpp b/ui/tests/src/test_layout.cpp
index 9a9f62d9..05a9509f 100644
--- a/ui/tests/src/test_layout.cpp
+++ b/ui/tests/src/test_layout.cpp
@@ -244,6 +244,46 @@ TEST_CASE(horizontal_candidate_translation_uses_a_second_line)
     REQUIRE_NEAR(list.MeasureInLayout({1000.0f, 1000.0f}).height, plain.height);
 }
 
+TEST_CASE(horizontal_candidate_translation_keeps_the_row_bottom_padding_below_it)
+{
+    // 行高里的底部内边距挪到翻译下面，而不是夹在候选与翻译之间；挪动不应让整行变高。
+    CandidateList list(38.0f);
+    CandidateList::Appearance appearance;
+    appearance.itemHeight = 38.0f;
+    appearance.contentPadBottom = 5.0f;
+    list.SetAppearance(appearance);
+    list.SetOrientation(CandidateList::Orientation::Horizontal);
+    list.SetItems({{L"1", L"candidate", L"", L"word"}});
+    const float translationH = appearance.fontSize * 0.78f * 1.25f;
+    REQUIRE_NEAR(list.MeasureInLayout({1000.0f, 1000.0f}).height, 38.0f + translationH);
+    list.ArrangeInLayout({0.0f, 0.0f, 1000.0f, 38.0f + translationH});
+    const RectF item = list.GetItemBounds(0);
+    REQUIRE_NEAR(item.height, 38.0f + translationH);
+}
+
+TEST_CASE(justified_horizontal_candidates_spread_spare_width_to_the_right_edge)
+{
+    CandidateList list(28.0f);
+    CandidateList::Appearance appearance;
+    appearance.itemHeight = 28.0f;
+    appearance.itemGap = 0.0f;
+    appearance.justifyHorizontalRows = true;
+    list.SetAppearance(appearance);
+    list.SetOrientation(CandidateList::Orientation::Horizontal);
+    list.SetItems({{L"1", L"候选", L"", L""}, {L"2", L"候选", L"", L""}});
+    const SizeF natural = list.MeasureInLayout({1000.0f, 1000.0f});
+    const float naturalFirstWidth = list.GetItemBounds(0).width;
+
+    // 卡片保持了更宽的尺寸：多出的 40 均分给两项，末项右边贴着列表右边。
+    list.ArrangeInLayout({10.0f, 0.0f, natural.width + 40.0f, natural.height});
+    const RectF first = list.GetItemBounds(0);
+    const RectF second = list.GetItemBounds(1);
+    REQUIRE_NEAR(first.x, 10.0f);
+    REQUIRE_NEAR(first.width, naturalFirstWidth + 20.0f);
+    REQUIRE_NEAR(second.x, first.x + first.width);
+    REQUIRE_NEAR(second.x + second.width, 10.0f + natural.width + 40.0f);
+}
+
 TEST_CASE(vertical_candidate_rows_fill_a_wider_arranged_width)
 {
     // 竖排候选项的自然宽度较窄，但被分配到更宽的行宽时（如卡片最小宽度撑大），