style(seller): 发布页价格卡固定右侧两栏布局

frontend/src/styles/mobile-seller.css

@@ -173,6 +173,11 @@
   display: none;
 }
 
+.mobile-seller-host .seller-form-layout {
+  grid-template-columns: 1fr;
+  gap: 16px;
+}
+
 .mobile-seller-host .seller-summary {
   position: static;
 }

frontend/src/styles/seller.css

@@ -658,7 +658,7 @@ button.seller-code:not(:disabled):hover {
 
 /* 发布页：主表单 + 右侧悬浮价格栏 */
 .seller-form-page {
-  max-width: 1240px;
+  max-width: 1280px;
 }
 
 .seller-draft-status {
@@ -671,11 +671,11 @@ button.seller-code:not(:disabled):hover {
   margin-bottom: 16px;
 }
 
-/* 发布页：主体占满内容宽度，结算栏在大屏时独立到右侧留白 */
+/* 发布页：主体与结算栏始终两栏，价格卡固定在右侧 */
 .seller-form-layout {
   display: grid;
-  grid-template-columns: minmax(0, 1fr);
-  gap: 24px;
+  grid-template-columns: minmax(0, 1fr) 320px;
+  gap: 20px;
 }
 
 .seller-form-main {
@@ -689,18 +689,6 @@ button.seller-code:not(:disabled):hover {
   margin-left: auto;
 }
 
-@media (min-width: 1920px) {
-  .seller-form-layout {
-    grid-template-columns: minmax(0, 1fr) 320px;
-    gap: 20px;
-    margin-right: -340px;
-  }
-
-  .seller-form-aside {
-    max-width: none;
-  }
-}
-
 /* 点选式选项，替代下拉框 */
 .seller-pill-group {
   display: flex;
@@ -839,10 +827,6 @@ button.seller-code:not(:disabled):hover {
 }
 
 @media (max-width: 1100px) {
-  .seller-form-layout {
-    grid-template-columns: 1fr;
-  }
-
   .seller-stat-strip {
     grid-template-columns: repeat(3, minmax(0, 1fr));
   }
@@ -855,12 +839,6 @@ button.seller-code:not(:disabled):hover {
     width: 100%;
     min-width: 0;
   }
-
-  .seller-summary {
-    position: static;
-    max-height: none;
-    overflow: visible;
-  }
 }
 
 @media (max-width: 768px) {