diff --git a/app/static/erp-shell.css b/app/static/erp-shell.css
index 8a5d3b8..f096cb8 100644
--- a/app/static/erp-shell.css
+++ b/app/static/erp-shell.css
@@ -285,18 +285,23 @@ body.erp-app-body { background: var(--color-canvas-white); height: 100vh; overfl
 
 /* ── 반응형 ── */
 @media (max-width: 900px) {
-  /* 데스크탑 접힘(:has collapsed) 규칙보다 특이도 맞춰 모바일에서 사이드바 칸 0 강제 */
+  /* 모바일: grid 자체 해제(데스크탑 collapsed :has 규칙과의 특이도 싸움 회피).
+     사이드바는 흐름 밖 떠있는 오버레이, 본문은 풀폭 block. */
+  body.erp-app-body { height: auto; overflow: auto; }
   .erp-app,
-  .erp-app:has(.erp-sidebar[data-collapsed="true"]) { grid-template-columns: 0 1fr; }
+  .erp-app:has(.erp-sidebar[data-collapsed="true"]) { display: block; }
   .erp-sidebar {
-    position: fixed; left: 0; top: 0; height: 100vh;
+    position: fixed; left: 0; top: 0; height: 100vh; z-index: 1000;
     width: var(--erp-sidebar-w);
     transform: translateX(-100%);
     transition: transform .2s ease;
     box-shadow: 0 0 0 1px var(--color-subtle-ash);
   }
+  /* 모바일선 데스크탑 접힘 무시 — 메뉴 열면 풀폭으로 */
+  .erp-sidebar[data-collapsed="true"] { width: var(--erp-sidebar-w); }
   .erp-sidebar.is-open { transform: translateX(0); }
   .erp-sidebar-mobile-toggle { display: inline-flex; }
+  .erp-content { width: 100%; min-width: 0; }
   .erp-form-grid { grid-template-columns: 1fr 1fr; }
   .erp-field-wide { grid-column: span 2; }
 }
diff --git a/app/templates/erp_base.html b/app/templates/erp_base.html
index ec69a5a..dd6f5b9 100644
--- a/app/templates/erp_base.html
+++ b/app/templates/erp_base.html
@@ -4,8 +4,8 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>{{ page_title or "ERP" }} — DBX Corporation</title>
-    <link rel="stylesheet" href="/static/erp.css?v=20260615a" />
-    <link rel="stylesheet" href="/static/erp-shell.css?v=20260615a" />
+    <link rel="stylesheet" href="/static/erp.css?v=20260615b" />
+    <link rel="stylesheet" href="/static/erp-shell.css?v=20260615b" />
     <link rel="stylesheet" href="/static/erp-attach-viewer.css" />
     {% block head_extra %}{% endblock %}
   </head>