diff --git a/apps/web/src/layouts/MainLayout.css b/apps/web/src/layouts/MainLayout.css
index 42efc44..d6e2f17 100644
--- a/apps/web/src/layouts/MainLayout.css
+++ b/apps/web/src/layouts/MainLayout.css
@@ -2,6 +2,11 @@
     min-height: 100vh;
 }
 
+/* 除左侧菜单外的完整内容区域，供页面按实际可用宽度响应。 */
+.main-content-layout {
+    container-type: inline-size;
+}
+
 .main-sider {
     background: var(--sider-bg) !important;
     display: flex;
diff --git a/apps/web/src/pages/products/ProductEditPage.css b/apps/web/src/pages/products/ProductEditPage.css
index 3ef0fa5..bf96d20 100644
--- a/apps/web/src/pages/products/ProductEditPage.css
+++ b/apps/web/src/pages/products/ProductEditPage.css
@@ -55,6 +55,16 @@
     gap: 16px;
 }
 
+/*
+ * 主内容区不足 1360px 时，采集面板移至编辑卡片下方；大于等于该宽度时
+ * 保持两列。断点依据除菜单栏外的实际内容宽度，不依赖浏览器窗口宽度。
+ */
+@container (max-width: 1199px) {
+    .editor-workspace {
+        grid-template-columns: 1fr;
+    }
+}
+
 /* 区块卡片公共外框 */
 .editor-section.ant-card {
     border: 1px solid #e9e7ef;
@@ -69,6 +79,52 @@
     font-weight: 600;
 }
 
+/*
+ * 01 / 02 / 04 共用的横向表单：Label 与控件列作为最大 780px 的整体居中。
+ * 宽度充足时控件不超过 680px；卡片变窄时先吃掉两侧留白，再收缩控件列。
+ * 容器查询以卡片实际宽度为准，不受左侧菜单或采集面板布局的间接影响。
+ */
+.editor-horizontal-section.ant-card {
+    container-type: inline-size;
+}
+.editor-horizontal-section .ant-form-item-row {
+    justify-content: center;
+    min-width: 0;
+}
+.editor-horizontal-section .ant-form-item-label {
+    flex: 0 0 100px !important;
+    max-width: 100px !important;
+}
+.editor-horizontal-section .ant-form-item-control {
+    flex: 0 1 min(680px, calc(100% - 100px)) !important;
+    width: auto;
+    max-width: min(680px, calc(100% - 100px)) !important;
+    min-width: 0;
+}
+
+/*
+ * 100px 标签列与包装尺寸输入组在 480px 以下已没有足够可读空间；此时才
+ * 切换为纵向表单。该断点读取卡片宽度，非浏览器窗口宽度。
+ */
+@container (max-width: 479px) {
+    .editor-horizontal-section .ant-form-item-row {
+        flex-direction: column;
+        row-gap: 4px;
+    }
+    .editor-horizontal-section .ant-form-item-row > .ant-form-item-label {
+        flex: 0 0 auto !important;
+        max-width: 100% !important;
+        padding: 0;
+        text-align: left;
+    }
+    .editor-horizontal-section .ant-form-item-row > .ant-form-item-control {
+        flex: 1 1 auto !important;
+        width: 100%;
+        max-width: 100% !important;
+        min-width: 0;
+    }
+}
+
 /* 表单栅格（主要信息与其它区块使用） */
 .editor-form-grid {
     display: grid;
@@ -123,12 +179,6 @@
     display: flex;
 }
 
-@media (max-width: 1180px) {
-    /* 窄屏：采集面板移到主编辑列下方 */
-    .editor-workspace {
-        grid-template-columns: 1fr;
-    }
-}
 /*
  * ≤700px：整张表单切换为纵向布局（标签在上、控件在下）。
  * 更宽时保持"标签 | 控件"同行，随宽度缩小优先压缩控件长度
@@ -136,17 +186,23 @@
  * labelCol/wrapperCol 以内联样式注入 flex，故此处需要 !important 覆盖。
  */
 @media (max-width: 700px) {
-    .product-editor .ant-form-item-row {
+    .product-editor .editor-section:not(.editor-horizontal-section) .ant-form-item-row {
         flex-direction: column;
         row-gap: 4px;
     }
-    .product-editor .ant-form-item-row > .ant-form-item-label {
+    .product-editor
+        .editor-section:not(.editor-horizontal-section)
+        .ant-form-item-row
+        > .ant-form-item-label {
         flex: 0 0 auto !important;
         max-width: 100% !important;
         padding: 0;
         text-align: left;
     }
-    .product-editor .ant-form-item-row > .ant-form-item-control {
+    .product-editor
+        .editor-section:not(.editor-horizontal-section)
+        .ant-form-item-row
+        > .ant-form-item-control {
         flex: 1 1 auto !important;
         width: 100%;
         max-width: 100% !important;
diff --git a/apps/web/src/pages/products/ProductEditPage.tsx b/apps/web/src/pages/products/ProductEditPage.tsx
index 7ba8444..f36492b 100644
--- a/apps/web/src/pages/products/ProductEditPage.tsx
+++ b/apps/web/src/pages/products/ProductEditPage.tsx
@@ -889,7 +889,7 @@ const ProductEditPage = () => {
             form={form}
             layout="horizontal"
             labelAlign="right"
-            labelCol={{ flex: '190px' }}
+            labelCol={{ flex: '0 0 100px' }}
             wrapperCol={{ flex: '0 1 680px' }}
             onFinish={save}
             requiredMark
diff --git a/apps/web/src/pages/products/components/CollectedProductInfoPanel.css b/apps/web/src/pages/products/components/CollectedProductInfoPanel.css
index b310457..1ef837e 100644
--- a/apps/web/src/pages/products/components/CollectedProductInfoPanel.css
+++ b/apps/web/src/pages/products/components/CollectedProductInfoPanel.css
@@ -171,8 +171,8 @@
     aspect-ratio: 3 / 4;
     object-fit: cover;
 }
-@media (max-width: 1180px) {
-    /* 窄屏下面板退化为工作区下方整行，不再固定高度 */
+@container (max-width: 1199px) {
+    /* 主内容区不足 1360px 时，面板退化为工作区下方整行，不再固定高度。 */
     .editor-aside {
         position: static;
     }
diff --git a/apps/web/src/pages/products/components/ProductAttributeSection.tsx b/apps/web/src/pages/products/components/ProductAttributeSection.tsx
index 830c144..2bbcf55 100644
--- a/apps/web/src/pages/products/components/ProductAttributeSection.tsx
+++ b/apps/web/src/pages/products/components/ProductAttributeSection.tsx
@@ -69,7 +69,7 @@ export function ProductAttributeSection({
         setDictionarySearches({});
     }, [selectedCategoryId]);
     return (
-        <Card className="editor-section" bordered={false}>
+        <Card className="editor-section editor-horizontal-section" bordered={false}>
             <SectionTitle
                 number="02"
                 title="产品属性"
diff --git a/apps/web/src/pages/products/components/ProductMainInfoSection.css b/apps/web/src/pages/products/components/ProductMainInfoSection.css
index d369ffa..d56df6f 100644
--- a/apps/web/src/pages/products/components/ProductMainInfoSection.css
+++ b/apps/web/src/pages/products/components/ProductMainInfoSection.css
@@ -41,7 +41,8 @@
     display: flex;
     align-items: center;
 }
-@media (max-width: 860px) {
+/* 包装尺寸跟随主要信息卡片的实际宽度，和表单 Label 的换行阈值保持一致。 */
+@container (max-width: 479px) {
     .package-dimensions-controls {
         width: 100%;
         grid-template-columns: 1fr;
diff --git a/apps/web/src/pages/products/components/ProductMainInfoSection.tsx b/apps/web/src/pages/products/components/ProductMainInfoSection.tsx
index 3b7cc54..c4b9ce7 100644
--- a/apps/web/src/pages/products/components/ProductMainInfoSection.tsx
+++ b/apps/web/src/pages/products/components/ProductMainInfoSection.tsx
@@ -68,7 +68,7 @@ export function ProductMainInfoSection({
     onCategorySearch,
 }: Props) {
     return (
-        <Card className="editor-section" bordered={false}>
+        <Card className="editor-section editor-horizontal-section" bordered={false}>
             <SectionTitle
                 number="01"
                 title="主要信息"
diff --git a/apps/web/src/pages/products/components/ProductOtherSection.tsx b/apps/web/src/pages/products/components/ProductOtherSection.tsx
index 99d7a40..6b51d9a 100644
--- a/apps/web/src/pages/products/components/ProductOtherSection.tsx
+++ b/apps/web/src/pages/products/components/ProductOtherSection.tsx
@@ -10,7 +10,7 @@ type Props = {
 /** 「04 其它」区块：货源链接与备注；已上架 SKU 仅保存 Atlas 草稿，不回写平台商品。 */
 export function ProductOtherSection({ canOpenSupplyUrl, platformName, onOpenSupplyUrl }: Props) {
     return (
-        <Card className="editor-section" bordered={false}>
+        <Card className="editor-section editor-horizontal-section" bordered={false}>
             <div className="editor-section-heading" style={{ marginBottom: 8 }}>
                 <div>
                     <Typography.Title level={4}>
diff --git a/apps/web/src/pages/products/components/ProductVariantSection.css b/apps/web/src/pages/products/components/ProductVariantSection.css
index ba56e2b..163308b 100644
--- a/apps/web/src/pages/products/components/ProductVariantSection.css
+++ b/apps/web/src/pages/products/components/ProductVariantSection.css
@@ -98,10 +98,12 @@
     font-weight: 500;
 }
 .sku-card-field {
-    flex: 1 1 120px;
+    /* 三个可编辑字段在同一行时，输入框允许收缩至 100px 后才换行。 */
+    flex: 1 1 100px;
+    min-width: 100px;
 }
 .sku-price-field {
-    flex: 1 1 130px;
+    flex: 1 1 100px;
 }
 .sku-card-field > span,
 .sku-card-value > span {
@@ -157,34 +159,59 @@
     margin-left: auto;
 }
 
-/* 展开区：左侧采集图片、右侧规格面板 */
+/* 展开区：图片与规格使用同层级面板，宽度不足时再改为上下排列。 */
 .sku-card-expanded {
     display: grid;
-    grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr);
-    gap: 32px;
+    grid-template-columns: minmax(0, 1fr) minmax(360px, 1fr);
+    gap: 20px;
     margin-top: 16px;
     padding-top: 16px;
     border-top: 1px solid #f0edf3;
 }
+.sku-media-panel,
+.sku-spec-panel {
+    padding: 18px;
+    border: 1px solid #eeeaf3;
+    border-radius: 10px;
+    background: #fcfbfd;
+}
 .sku-media-panel h5.ant-typography,
 .sku-spec-panel h5.ant-typography {
     margin: 0 0 12px;
 }
 .sku-media-grid {
     display: grid;
-    grid-template-columns: repeat(2, minmax(0, 1fr));
+    grid-template-columns: repeat(4, minmax(0, 1fr));
     gap: 10px;
     align-items: start;
 }
 .sku-media-item {
     position: relative;
     min-width: 0;
+    /* 每张图片框固定为 3:4；实际图片使用 contain，完整居中展示。 */
     aspect-ratio: 3 / 4;
+    align-self: start;
     overflow: hidden;
     border: 1px solid #ece8f0;
     border-radius: 8px;
     background: #f5f3f7;
 }
+.sku-media-item--main {
+    grid-column: span 2;
+    grid-row: span 2;
+}
+.sku-media-main-badge {
+    position: absolute;
+    top: 6px;
+    left: 6px;
+    z-index: 1;
+    padding: 2px 6px;
+    border-radius: 4px;
+    background: rgb(64 57 79 / 72%);
+    color: #fff;
+    font-size: 11px;
+    line-height: 18px;
+}
 .sku-media-item .ant-btn {
     position: absolute;
     right: 6px;
@@ -200,24 +227,28 @@
     height: 100%;
 }
 .sku-media-item img {
+    display: block;
     object-fit: contain;
+    object-position: center;
 }
-.sku-media-empty {
+.sku-media-picker.ant-btn {
     display: flex;
-    grid-column: 1 / -1;
-    min-height: 190px;
+    width: 100%;
+    height: 100%;
+    aspect-ratio: 3 / 4;
+    align-self: start;
     align-items: center;
     justify-content: center;
-    border: 1px dashed #d9d4df;
     border-radius: 8px;
     color: #90889c;
     font-size: 13px;
 }
+.sku-media-picker--empty {
+    grid-column: span 2;
+    grid-row: span 2;
+}
 .sku-spec-panel {
-    padding: 18px 18px 6px;
-    border: 1px solid #eeeaf3;
-    border-radius: 10px;
-    background: #fcfbfd;
+    padding-bottom: 6px;
 }
 .sku-spec-panel .ant-form-item {
     margin-bottom: 16px;
diff --git a/apps/web/src/pages/products/components/ProductVariantSection.tsx b/apps/web/src/pages/products/components/ProductVariantSection.tsx
index 5c6940c..39e8eea 100644
--- a/apps/web/src/pages/products/components/ProductVariantSection.tsx
+++ b/apps/web/src/pages/products/components/ProductVariantSection.tsx
@@ -354,7 +354,7 @@ export function ProductVariantSection({
                                                     </Typography.Title>
                                                     {imageCandidates.length ? (
                                                         <div className="sku-media-grid">
-                                                            {imageCandidates.map((candidate) => {
+                                                            {imageCandidates.map((candidate, imageIndex) => {
                                                                 // 仅"转存成功"的候选可直接勾选；
                                                                 // 其余按转存状态展示对应按钮。
                                                                 const selectable =
@@ -368,9 +368,14 @@ export function ProductVariantSection({
                                                                     );
                                                                 return (
                                                                     <div
-                                                                        className={`sku-media-item ${selected ? 'selected' : ''}`}
+                                                                        className={`sku-media-item ${imageIndex === 0 ? 'sku-media-item--main' : ''} ${selected ? 'selected' : ''}`}
                                                                         key={candidate.id}
                                                                     >
+                                                                        {imageIndex === 0 && (
+                                                                            <span className="sku-media-main-badge">
+                                                                                主图
+                                                                            </span>
+                                                                        )}
                                                                         <Image
                                                                             src={
                                                                                 candidate.source_url
@@ -428,10 +433,23 @@ export function ProductVariantSection({
                                                                     </div>
                                                                 );
                                                             })}
+                                                            {/* 仅提供素材选择入口的视觉占位，实际选择流程后续接入。 */}
+                                                            <Button
+                                                                className="sku-media-picker"
+                                                                type="dashed"
+                                                            >
+                                                                选择图片
+                                                            </Button>
                                                         </div>
                                                     ) : (
-                                                        <div className="sku-media-empty">
-                                                            暂无采集图片
+                                                        <div className="sku-media-grid">
+                                                            {/* 没有采集图片时仍保留选择素材的入口。 */}
+                                                            <Button
+                                                                className="sku-media-picker sku-media-picker--empty"
+                                                                type="dashed"
+                                                            >
+                                                                选择图片
+                                                            </Button>
                                                         </div>
                                                     )}
                                                 </div>