diff --git a/app/modules/cupang/templates/cupang/box_calc.html b/app/modules/cupang/templates/cupang/box_calc.html
index 0abaad1..2eca0a5 100644
--- a/app/modules/cupang/templates/cupang/box_calc.html
+++ b/app/modules/cupang/templates/cupang/box_calc.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
@@ -19,6 +19,8 @@
   </div>
   {% else %}
 
+  <div class="cpg-calc-layout">
+
   <div class="erp-card cpg-form-card cpg-calc-card">
     <div class="cpg-card-head">
       <h2>박스 계산</h2>
@@ -66,6 +68,8 @@
     <div class="cpg-sum-boxes" id="cpg-sum-boxes"></div>
   </div>
 
+  </div><!-- /cpg-calc-layout -->
+
   <script type="application/json" id="cpg-calc-rules">{{ box_rules | tojson }}</script>
   <script>
   // 박스 계산기 — 행 추가/삭제, 수량 수정 후 재계산.
diff --git a/app/modules/cupang/templates/cupang/box_rules.html b/app/modules/cupang/templates/cupang/box_rules.html
index b6769db..6f5c78a 100644
--- a/app/modules/cupang/templates/cupang/box_rules.html
+++ b/app/modules/cupang/templates/cupang/box_rules.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/modules/cupang/templates/cupang/centers.html b/app/modules/cupang/templates/cupang/centers.html
index 3e9cca3..3f8d552 100644
--- a/app/modules/cupang/templates/cupang/centers.html
+++ b/app/modules/cupang/templates/cupang/centers.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/modules/cupang/templates/cupang/detail.html b/app/modules/cupang/templates/cupang/detail.html
index 3aead7a..74f3a88 100644
--- a/app/modules/cupang/templates/cupang/detail.html
+++ b/app/modules/cupang/templates/cupang/detail.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/modules/cupang/templates/cupang/form.html b/app/modules/cupang/templates/cupang/form.html
index e258325..77b3d32 100644
--- a/app/modules/cupang/templates/cupang/form.html
+++ b/app/modules/cupang/templates/cupang/form.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/modules/cupang/templates/cupang/index.html b/app/modules/cupang/templates/cupang/index.html
index 1ef8ad3..2198f10 100644
--- a/app/modules/cupang/templates/cupang/index.html
+++ b/app/modules/cupang/templates/cupang/index.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/modules/cupang/templates/cupang/products.html b/app/modules/cupang/templates/cupang/products.html
index f36f2a2..92e8fb7 100644
--- a/app/modules/cupang/templates/cupang/products.html
+++ b/app/modules/cupang/templates/cupang/products.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828t" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260828u" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/static/cupang.css b/app/static/cupang.css
index f64eb3a..f8325c3 100644
--- a/app/static/cupang.css
+++ b/app/static/cupang.css
@@ -346,7 +346,7 @@
 
 .cpg-sum-kpis {
   display: grid;
-  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
+  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
   gap: 10px;
 }
 .cpg-kpi {
@@ -364,7 +364,7 @@
 
 .cpg-sum-prods {
   display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
+  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
   gap: 8px;
 }
 .cpg-sum-prod {
@@ -394,7 +394,7 @@
 /* 혼합 박스 카드 */
 .cpg-sum-boxes {
   display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
+  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
   gap: 12px;
 }
 .cpg-box-card {
@@ -489,3 +489,28 @@
   }
   .cpg-box-fill { opacity: .16; }
 }
+
+/* 박스 계산 2열 레이아웃 — 왼쪽 입력표 / 오른쪽 요약. 좁으면 세로로 쌓임. */
+.cpg-calc-layout {
+  display: grid;
+  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
+  gap: 16px;
+  align-items: start;
+}
+.cpg-calc-layout > .erp-card { margin-bottom: 0; }
+@media (max-width: 1280px) {
+  .cpg-calc-layout { grid-template-columns: minmax(0, 1fr); }
+}
+
+/* 행이 많아도 카드가 잘리지 않도록 표 자체를 스크롤시킨다. */
+.cpg-calc-card .erp-table-wrap {
+  overflow: auto;
+  max-height: min(58vh, 560px);
+}
+.cpg-calc-card .cpg-calc-table thead th {
+  position: sticky;
+  top: 0;
+  z-index: 1;
+  background: var(--color-canvas-white);
+}
+.cpg-calc-actions { flex-wrap: wrap; }