diff --git a/.gitignore b/.gitignore
index 08c0512..6de998a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ __pycache__/
 
 # dispatch 라벨 PDF 샘플(실제 고객 PII — 커밋 금지)
 docs/samples/
+tests/js/.out/
diff --git a/app/modules/cupang/templates/cupang/box_calc.html b/app/modules/cupang/templates/cupang/box_calc.html
index 32e2075..7ff0223 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
@@ -59,7 +59,7 @@
     <div class="erp-card cpg-form-card cpg-calc-sum">
       <div class="cpg-card-head">
         <h2>② 박스 요약</h2>
-        <span class="erp-muted">카드를 ③ 센터로 끌어다 놓으면 잔여가 줄어듭니다.</span>
+        <span class="erp-muted">카드를 ③ 센터로 끌어다 놓거나, 카드를 클릭해 담습니다.</span>
       </div>
 
       <div id="cpg-sum-empty" class="erp-muted">왼쪽에서 제품과 수량을 넣고 계산하세요.</div>
@@ -75,11 +75,11 @@
       </div>
     </div>
 
-    <!-- ③ 센터 분배 — 드래그해서 담고 수량 입력 -->
+    <!-- ③ 센터 분배 — 선택한 센터만 표시 -->
     <div class="erp-card cpg-form-card cpg-dist-card">
       <div class="cpg-card-head">
         <h2>③ 센터 분배</h2>
-        <span class="erp-muted">입고센터 관리에 등록한 센터만 표시됩니다.</span>
+        <span class="erp-muted">담을 센터를 골라 추가하세요.</span>
       </div>
 
       {% if not centers %}
@@ -87,31 +87,47 @@
         등록된 입고센터가 없습니다. <a href="/cupang/centers">입고센터 관리</a>에서 먼저 센터를 추가하세요.
       </p>
       {% else %}
-      <div class="cpg-dist-list" id="cpg-dist-list">
-        {% for c in centers %}
-        <div class="cpg-dist-center" data-center-id="{{ c.id }}" data-center-name="{{ c.name }}">
-          <div class="cpg-dist-head">
-            <strong>{{ c.name }}</strong>
-            <span class="erp-badge erp-badge-neutral cpg-dist-total" data-total-for="{{ c.id }}">0박스</span>
-          </div>
-          <div class="cpg-dist-drop" data-drop-for="{{ c.id }}">
-            <span class="cpg-dist-hint">여기로 박스를 끌어다 놓기</span>
-            <ul class="cpg-dist-items" data-items-for="{{ c.id }}"></ul>
-          </div>
-        </div>
-        {% endfor %}
+      <div class="cpg-inline-form cpg-center-pick">
+        <select class="erp-select" id="cpg-center-pick">
+          {% for c in centers %}
+          <option value="{{ c.id }}">{{ c.name }}</option>
+          {% endfor %}
+        </select>
+        <button type="button" class="erp-btn erp-btn-primary" id="cpg-center-add">+ 센터 추가</button>
       </div>
+      <div class="cpg-dist-list" id="cpg-dist-list"></div>
+      <p class="erp-muted" id="cpg-dist-empty">추가한 센터가 여기에 표시됩니다.</p>
       {% endif %}
     </div>
 
   </div><!-- /cpg-calc3 -->
 
+  <!-- 담을 박스 수량 입력 대화상자 -->
+  <div class="cpg-modal" id="cpg-dlg" hidden>
+    <div class="cpg-modal-back" data-dlg-close></div>
+    <div class="cpg-modal-box" role="dialog" aria-modal="true" aria-labelledby="cpg-dlg-title">
+      <h3 id="cpg-dlg-title">센터에 담기</h3>
+      <p class="cpg-dlg-item" id="cpg-dlg-item"></p>
+      <label class="erp-field"><span>센터</span>
+        <select class="erp-select" id="cpg-dlg-center"></select></label>
+      <label class="erp-field"><span>박스 수량</span>
+        <input class="erp-input" type="number" id="cpg-dlg-qty" min="1" step="1" /></label>
+      <p class="erp-muted" id="cpg-dlg-hint"></p>
+      <div class="erp-page-actions cpg-dlg-actions">
+        <button type="button" class="erp-btn erp-btn-primary" id="cpg-dlg-ok">담기</button>
+        <button type="button" class="erp-btn erp-btn-outline" id="cpg-dlg-all">잔여 전부 담기</button>
+        <button type="button" class="erp-btn erp-btn-outline" data-dlg-close>취소</button>
+      </div>
+    </div>
+  </div>
+
   <script type="application/json" id="cpg-calc-rules">{{ box_rules | tojson }}</script>
+  <script type="application/json" id="cpg-centers">{{ centers | tojson }}</script>
   <script>
   // 박스 계산 3열 화면.
   //  ① 제품명·수량 입력 → 서버(POST /cupang/api/box-calc)에서 계산
-  //  ② 계산 결과 요약(제품별 박스 / 자투리 혼합 박스) — 드래그 소스
-  //  ③ 센터별 분배 — 드롭 대상. 배분한 수량만큼 ② 의 잔여가 줄어든다.
+  //  ② 계산 결과 요약 — 드래그(또는 클릭) 소스
+  //  ③ 선택한 센터에만 분배. 담은 수량만큼 ② 의 잔여가 즉시 줄어든다.
   // 분배 내역은 화면 안에서만 유지된다(DB 저장 없음).
   (function () {
     var tbody = document.getElementById("cpg-calc-rows");
@@ -127,9 +143,23 @@
     var sumBoxes = document.getElementById("cpg-sum-boxes");
     var sumMixNote = document.getElementById("cpg-sum-mix-note");
     var distList = document.getElementById("cpg-dist-list");
+    var distEmpty = document.getElementById("cpg-dist-empty");
+    var centerPick = document.getElementById("cpg-center-pick");
+    var centerAdd = document.getElementById("cpg-center-add");
+    var dlg = document.getElementById("cpg-dlg");
+    var dlgItem = document.getElementById("cpg-dlg-item");
+    var dlgCenter = document.getElementById("cpg-dlg-center");
+    var dlgQty = document.getElementById("cpg-dlg-qty");
+    var dlgHint = document.getElementById("cpg-dlg-hint");
+    var dlgOk = document.getElementById("cpg-dlg-ok");
+    var dlgAll = document.getElementById("cpg-dlg-all");
 
-    var rules = [];
-    try { rules = JSON.parse(document.getElementById("cpg-calc-rules").textContent || "[]"); } catch (e) {}
+    function readJson(id) {
+      var el = document.getElementById(id);
+      try { return JSON.parse((el && el.textContent) || "[]"); } catch (e) { return []; }
+    }
+    var rules = readJson("cpg-calc-rules");
+    var centers = readJson("cpg-centers");
 
     function esc(s) { var d = document.createElement("div"); d.textContent = s == null ? "" : s; return d.innerHTML; }
 
@@ -139,10 +169,22 @@
                      esc(r.product_name_snapshot || r.product_code) + "</option>";
     });
 
-    // 계산 결과 + 센터 배분 상태
-    var calc = { results: [], mixes: [] };
-    var alloc = {};   // centerId -> [{id, key, kind, label, count}]
+    // ── 상태 ─────────────────────────────────────────
+    var calc = { results: [], mixes: [] };   // 서버 계산 결과
+    var units = {};                          // key -> 박스 1개당 상품 수
+    var labels = {};                         // key -> 표시 이름
+    var openCenters = [];                    // ③ 에 추가한 센터 id (문자열)
+    var alloc = {};                          // centerId -> [{id, key, count}]
     var seq = 0;
+    var pending = null;                      // 대화상자 대상 {key, centerId}
+
+    function prodKey(code) { return "p:" + code; }
+    function mixKey(boxName, idx) { return "m:" + boxName + "#" + idx; }
+
+    function centerName(cid) {
+      var hit = centers.filter(function (c) { return String(c.id) === String(cid); })[0];
+      return hit ? hit.name : cid;
+    }
 
     // ── ① 입력 표 ─────────────────────────────────────
     function addRow(code, qty) {
@@ -185,6 +227,20 @@
         .then(function (data) {
           calc.results = ((data && data.results) || []).filter(function (r) { return r.configured; });
           calc.mixes = (data && data.mixes) || [];
+          units = {};
+          labels = {};
+          calc.results.forEach(function (r) {
+            units[prodKey(r.product_code)] = r.units_per_box;
+            labels[prodKey(r.product_code)] = r.product_name;
+          });
+          calc.mixes.forEach(function (m) {
+            m.boxes.forEach(function (b, i) {
+              var n = 0;
+              b.items.forEach(function (it) { n += it.quantity; });
+              units[mixKey(m.box_name, i)] = n;
+              labels[mixKey(m.box_name, i)] = m.box_name + " 혼합 #" + (i + 1);
+            });
+          });
           var had = Object.keys(alloc).some(function (k) { return alloc[k].length; });
           alloc = {};   // 계산이 바뀌면 이전 배분은 근거가 사라지므로 비운다.
           render();
@@ -203,9 +259,6 @@
       return n;
     }
 
-    function mixKey(boxName, idx) { return "m:" + boxName + "#" + idx; }
-    function prodKey(code) { return "p:" + code; }
-
     function totalFor(key) {
       if (key.indexOf("p:") === 0) {
         var code = key.slice(2);
@@ -217,6 +270,18 @@
 
     function remainFor(key) { return Math.max(0, totalFor(key) - allocatedFor(key)); }
 
+    function addAlloc(cid, key, count) {
+      cid = String(cid);
+      var room = remainFor(key);
+      var n = Math.min(Math.max(parseInt(count, 10) || 0, 0), room);
+      if (n <= 0) return 0;
+      alloc[cid] = alloc[cid] || [];
+      var same = alloc[cid].filter(function (a) { return a.key === key; })[0];
+      if (same) { same.count += n; }
+      else { seq += 1; alloc[cid].push({ id: seq, key: key, count: n }); }
+      return n;
+    }
+
     // ── ② 요약 렌더 ───────────────────────────────────
     function boxSvg(fill, label) {
       var f = Math.max(0, Math.min(100, fill || 0));
@@ -274,14 +339,15 @@
         var used = r.full_boxes - remain;
         ph += '<div class="cpg-sum-prod' + (remain ? "" : " is-done") + '"' +
                 (remain ? ' draggable="true"' : "") +
-                ' data-key="' + esc(key) + '" data-kind="product" data-label="' + esc(r.product_name) + '">' +
+                ' data-key="' + esc(key) + '">' +
                 '<div class="cpg-sum-prod-head">' +
                   '<span class="cpg-sum-prod-name">' + esc(r.product_name) + "</span>" +
                   '<span class="erp-badge erp-badge-neutral">' + esc(r.box_name) + "</span>" +
                 "</div>" +
                 '<div class="cpg-sum-prod-nums">' +
                   "<strong>" + remain + "박스</strong>" +
-                  '<span class="erp-muted">총 ' + r.full_boxes + "박스" + (used ? " · 배분 " + used : "") + "</span>" +
+                  '<span class="erp-muted">' + (remain * r.units_per_box) + "개 · 총 " + r.full_boxes + "박스" +
+                    (used ? " · 배분 " + used : "") + "</span>" +
                   (r.remainder_units
                     ? '<span class="cpg-sum-left">자투리 ' + r.remainder_units + "개</span>"
                     : '<span class="cpg-sum-exact">딱 맞음</span>') +
@@ -305,8 +371,7 @@
             }).join("");
             bh += '<div class="cpg-box-card' + (remain ? "" : " is-done") + '"' +
                     (remain ? ' draggable="true"' : "") +
-                    ' data-key="' + esc(key) + '" data-kind="mix"' +
-                    ' data-label="' + esc(m.box_name + " 혼합 #" + (i + 1)) + '"' +
+                    ' data-key="' + esc(key) + '"' +
                     ' style="animation-delay:' + (n * 60) + 'ms">' +
                     '<div class="cpg-box-art">' + boxSvg(b.fill_percent, m.box_name) + "</div>" +
                     '<div class="cpg-box-info">' +
@@ -314,7 +379,7 @@
                         (remain ? "" : ' <span class="erp-badge erp-badge-success">배분됨</span>') + "</div>" +
                       '<ul class="cpg-box-items">' + items + "</ul>" +
                       '<div class="cpg-box-bar"><span style="width:' + b.fill_percent + '%"></span></div>' +
-                      '<div class="cpg-box-fillnum">' + b.fill_percent + "% 채움</div>" +
+                      '<div class="cpg-box-fillnum">' + b.fill_percent + "% 채움 · " + units[key] + "개</div>" +
                     "</div>" +
                   "</div>";
             n += 1;
@@ -327,41 +392,94 @@
     // ── ③ 센터 분배 렌더 ──────────────────────────────
     function renderDist() {
       if (!distList) return;
-      Array.prototype.forEach.call(distList.querySelectorAll(".cpg-dist-center"), function (box) {
-        var cid = box.getAttribute("data-center-id");
-        var list = box.querySelector("[data-items-for]");
-        var totalEl = box.querySelector("[data-total-for]");
+      if (distEmpty) distEmpty.hidden = openCenters.length > 0;
+
+      var html = "";
+      openCenters.forEach(function (cid) {
         var rows = alloc[cid] || [];
-        var total = 0;
-        var html = "";
+        var boxes = 0, pieces = 0, items = "";
         rows.forEach(function (a) {
-          total += a.count;
-          var max = a.count + remainFor(a.key);
-          html += '<li class="cpg-dist-item" data-entry="' + a.id + '">' +
-                    '<span class="cpg-dist-name">' + esc(a.label) + "</span>" +
-                    '<input class="erp-input cpg-dist-qty" type="number" min="1" max="' + max + '" value="' + a.count + '" />' +
-                    '<span class="cpg-dist-unit">박스</span>' +
-                    '<button type="button" class="erp-btn erp-btn-danger cpg-dist-del" title="빼기" aria-label="빼기">✕</button>' +
-                  "</li>";
+          var per = units[a.key] || 0;
+          boxes += a.count;
+          pieces += a.count * per;
+          items += '<li class="cpg-dist-item" data-entry="' + a.id + '">' +
+                     '<span class="cpg-dist-name">' + esc(labels[a.key] || a.key) + "</span>" +
+                     '<input class="erp-input cpg-dist-qty" type="number" min="1" step="1" value="' + a.count + '" />' +
+                     '<span class="cpg-dist-unit">박스 · ' + (a.count * per) + "개</span>" +
+                     '<button type="button" class="erp-btn erp-btn-danger cpg-dist-del" title="빼기" aria-label="빼기">✕</button>' +
+                   "</li>";
         });
-        list.innerHTML = html;
-        box.classList.toggle("has-items", rows.length > 0);
-        totalEl.textContent = total + "박스";
+        html += '<div class="cpg-dist-center' + (rows.length ? " has-items" : "") + '" data-drop-for="' + esc(cid) + '">' +
+                  '<div class="cpg-dist-head">' +
+                    "<strong>" + esc(centerName(cid)) + "</strong>" +
+                    '<span class="cpg-dist-sum">' +
+                      '<span class="erp-badge erp-badge-neutral">' + boxes + "박스</span>" +
+                      '<span class="erp-badge erp-badge-neutral">' + pieces + "개</span>" +
+                      '<button type="button" class="erp-btn erp-btn-outline cpg-dist-close" title="센터 빼기" aria-label="센터 빼기">✕</button>' +
+                    "</span>" +
+                  "</div>" +
+                  (rows.length
+                    ? '<ul class="cpg-dist-items">' + items + "</ul>"
+                    : '<p class="cpg-dist-hint">여기로 박스를 끌어다 놓기</p>') +
+                "</div>";
       });
+      distList.innerHTML = html;
     }
 
     function render() { renderSummary(); renderDist(); }
 
-    // ── 드래그 앤 드롭 ────────────────────────────────
+    // ── 수량 대화상자 ─────────────────────────────────
+    function openDialog(key, centerId) {
+      if (!openCenters.length) { msg.textContent = "먼저 ③ 에서 센터를 추가하세요."; return; }
+      var remain = remainFor(key);
+      if (remain <= 0) { msg.textContent = "남은 박스가 없습니다."; return; }
+
+      pending = { key: key };
+      dlgItem.textContent = (labels[key] || key) + " — 잔여 " + remain + "박스 (" + (remain * (units[key] || 0)) + "개)";
+      dlgCenter.innerHTML = openCenters.map(function (cid) {
+        return '<option value="' + esc(cid) + '"' + (String(cid) === String(centerId) ? " selected" : "") + ">" +
+               esc(centerName(cid)) + "</option>";
+      }).join("");
+      dlgQty.max = remain;
+      dlgQty.value = key.indexOf("m:") === 0 ? 1 : remain;
+      dlgHint.textContent = "1박스 = " + (units[key] || 0) + "개 · 최대 " + remain + "박스";
+      dlg.hidden = false;
+      dlgQty.focus();
+      dlgQty.select();
+    }
+
+    function closeDialog() { dlg.hidden = true; pending = null; }
+
+    function commitDialog(all) {
+      if (!pending) return;
+      var key = pending.key;
+      var cid = dlgCenter.value;
+      var want = all ? remainFor(key) : parseInt(dlgQty.value, 10);
+      var got = addAlloc(cid, key, want);
+      closeDialog();
+      render();
+      msg.textContent = got
+        ? centerName(cid) + " ← " + (labels[key] || key) + " " + got + "박스"
+        : "담을 수량이 없습니다.";
+    }
+
+    dlgOk.addEventListener("click", function () { commitDialog(false); });
+    dlgAll.addEventListener("click", function () { commitDialog(true); });
+    dlg.addEventListener("click", function (e) {
+      if (e.target.hasAttribute && e.target.hasAttribute("data-dlg-close")) closeDialog();
+    });
+    dlgQty.addEventListener("keydown", function (e) {
+      if (e.key === "Enter") { e.preventDefault(); commitDialog(false); }
+    });
+    document.addEventListener("keydown", function (e) {
+      if (e.key === "Escape" && !dlg.hidden) closeDialog();
+    });
+
+    // ── 드래그 앤 드롭 (+ 클릭 대체 경로) ─────────────
     sumBody.addEventListener("dragstart", function (e) {
       var card = e.target.closest("[data-key]");
       if (!card || card.getAttribute("draggable") !== "true") return;
-      var payload = {
-        key: card.getAttribute("data-key"),
-        kind: card.getAttribute("data-kind"),
-        label: card.getAttribute("data-label")
-      };
-      e.dataTransfer.setData("text/plain", JSON.stringify(payload));
+      e.dataTransfer.setData("text/plain", card.getAttribute("data-key"));
       e.dataTransfer.effectAllowed = "copy";
       card.classList.add("is-dragging");
     });
@@ -369,8 +487,14 @@
       var card = e.target.closest("[data-key]");
       if (card) card.classList.remove("is-dragging");
     });
+    sumBody.addEventListener("click", function (e) {
+      var card = e.target.closest("[data-key]");
+      if (!card) return;
+      openDialog(card.getAttribute("data-key"), openCenters[0]);
+    });
 
     if (distList) {
+      // 드롭 대상은 센터 패널 전체 — 여백에 놓아도 인식된다.
       distList.addEventListener("dragover", function (e) {
         var zone = e.target.closest("[data-drop-for]");
         if (!zone) return;
@@ -387,27 +511,15 @@
         if (!zone) return;
         e.preventDefault();
         zone.classList.remove("is-over");
-        var data;
-        try { data = JSON.parse(e.dataTransfer.getData("text/plain") || "{}"); } catch (err) { return; }
-        if (!data.key) return;
-        if (remainFor(data.key) <= 0) { msg.textContent = "남은 박스가 없습니다."; return; }
-
-        var cid = zone.getAttribute("data-drop-for");
-        alloc[cid] = alloc[cid] || [];
-        var same = alloc[cid].filter(function (a) { return a.key === data.key; })[0];
-        if (same) { same.count += 1; }
-        else {
-          seq += 1;
-          alloc[cid].push({ id: seq, key: data.key, kind: data.kind, label: data.label, count: 1 });
-        }
-        render();
+        var key = e.dataTransfer.getData("text/plain");
+        if (!key) return;
+        openDialog(key, zone.getAttribute("data-drop-for"));
       });
 
       distList.addEventListener("input", function (e) {
         if (!e.target.classList.contains("cpg-dist-qty")) return;
         var li = e.target.closest(".cpg-dist-item");
-        var centerEl = e.target.closest(".cpg-dist-center");
-        var cid = centerEl.getAttribute("data-center-id");
+        var cid = e.target.closest("[data-drop-for]").getAttribute("data-drop-for");
         var entry = (alloc[cid] || []).filter(function (a) { return String(a.id) === li.getAttribute("data-entry"); })[0];
         if (!entry) return;
         var want = parseInt(e.target.value, 10);
@@ -415,19 +527,49 @@
         var max = entry.count + remainFor(entry.key);
         if (want > max) { want = max; e.target.value = max; }
         entry.count = want;
-        // 입력 중에는 목록을 다시 그리지 않는다(포커스 유지) — 합계와 요약만 갱신.
-        var sum = 0;
-        (alloc[cid] || []).forEach(function (a) { sum += a.count; });
-        centerEl.querySelector("[data-total-for]").textContent = sum + "박스";
+        li.querySelector(".cpg-dist-unit").textContent = "박스 · " + (want * (units[entry.key] || 0)) + "개";
         renderSummary();
+        updateCenterTotals(cid);
       });
 
       distList.addEventListener("click", function (e) {
-        if (!e.target.closest(".cpg-dist-del")) return;
-        var li = e.target.closest(".cpg-dist-item");
-        var cid = e.target.closest(".cpg-dist-center").getAttribute("data-center-id");
-        alloc[cid] = (alloc[cid] || []).filter(function (a) { return String(a.id) !== li.getAttribute("data-entry"); });
-        render();
+        var zone = e.target.closest("[data-drop-for]");
+        if (!zone) return;
+        var cid = zone.getAttribute("data-drop-for");
+        if (e.target.closest(".cpg-dist-close")) {         // 센터 자체를 목록에서 뺀다
+          openCenters = openCenters.filter(function (x) { return x !== cid; });
+          delete alloc[cid];
+          render();
+          return;
+        }
+        if (e.target.closest(".cpg-dist-del")) {           // 담은 항목 제거 → 잔여로 복귀
+          var li = e.target.closest(".cpg-dist-item");
+          alloc[cid] = (alloc[cid] || []).filter(function (a) { return String(a.id) !== li.getAttribute("data-entry"); });
+          render();
+        }
+      });
+    }
+
+    function updateCenterTotals(cid) {
+      var zone = distList.querySelector('[data-drop-for="' + cid + '"]');
+      if (!zone) return;
+      var boxes = 0, pieces = 0;
+      (alloc[cid] || []).forEach(function (a) {
+        boxes += a.count;
+        pieces += a.count * (units[a.key] || 0);
+      });
+      var badges = zone.querySelectorAll(".cpg-dist-sum .erp-badge");
+      if (badges[0]) badges[0].textContent = boxes + "박스";
+      if (badges[1]) badges[1].textContent = pieces + "개";
+    }
+
+    if (centerAdd) {
+      centerAdd.addEventListener("click", function () {
+        var cid = centerPick.value;
+        if (!cid) return;
+        if (openCenters.indexOf(cid) >= 0) { msg.textContent = "이미 추가된 센터입니다."; return; }
+        openCenters.push(cid);
+        renderDist();
       });
     }
 
diff --git a/app/modules/cupang/templates/cupang/box_rules.html b/app/modules/cupang/templates/cupang/box_rules.html
index 0c64627..4d4d6e4 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% 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 dd59d6b..01d84c4 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% 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 59b5803..6e77cdb 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% 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 7eac1c4..3bf51fa 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% 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 762ba43..76e5f77 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% 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 9361385..38ce1e4 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=20260829b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260829c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
diff --git a/app/static/cupang.css b/app/static/cupang.css
index 7810942..de30422 100644
--- a/app/static/cupang.css
+++ b/app/static/cupang.css
@@ -625,19 +625,25 @@
   margin-bottom: 8px;
   font-size: 14px;
 }
-.cpg-dist-drop {
-  border: 1.5px dashed var(--color-subtle-ash);
-  border-radius: 8px;
-  padding: 8px;
-  min-height: 52px;
-  transition: background .15s ease, border-color .15s ease;
-}
-.cpg-dist-drop.is-over {
+/* 드롭 대상은 센터 패널 전체 */
+.cpg-dist-center { transition: background .15s ease, border-color .15s ease; }
+.cpg-dist-center.is-over {
   border-color: var(--color-rich-black);
   background: var(--color-ghost-gray);
 }
-.cpg-dist-hint { font-size: 12px; color: var(--color-midtone-gray); }
-.cpg-dist-center.has-items .cpg-dist-hint { display: none; }
+.cpg-dist-hint {
+  margin: 0;
+  padding: 10px 8px;
+  border: 1.5px dashed var(--color-subtle-ash);
+  border-radius: 8px;
+  font-size: 12px;
+  color: var(--color-midtone-gray);
+  text-align: center;
+}
+.cpg-dist-sum { display: inline-flex; align-items: center; gap: 6px; }
+.cpg-dist-close { padding: 0 6px; line-height: 1.5; }
+.cpg-center-pick { display: flex; gap: 8px; margin-bottom: 10px; }
+.cpg-center-pick .erp-select { flex: 1 1 auto; min-width: 0; }
 .cpg-dist-items { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
 .cpg-dist-item {
   display: flex;
@@ -649,3 +655,23 @@
 .cpg-dist-qty { width: 62px; min-width: 0; text-align: right; padding: 2px 6px; }
 .cpg-dist-unit { font-size: 12px; color: var(--color-midtone-gray); }
 .cpg-dist-del { padding: 2px 8px; line-height: 1.4; }
+
+/* 박스 수량 입력 대화상자 */
+.cpg-modal { position: fixed; inset: 0; z-index: 1200; display: flex; align-items: center; justify-content: center; }
+.cpg-modal[hidden] { display: none; }
+.cpg-modal-back { position: absolute; inset: 0; background: rgba(10, 10, 10, .45); }
+.cpg-modal-box {
+  position: relative;
+  width: min(420px, calc(100vw - 32px));
+  background: var(--color-canvas-white);
+  border-radius: 12px;
+  box-shadow: 0 18px 48px rgba(0, 0, 0, .28);
+  padding: 20px;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+.cpg-modal-box h3 { margin: 0; font-size: 17px; }
+.cpg-dlg-item { margin: 0; font-weight: 600; }
+.cpg-dlg-actions { margin: 4px 0 0; flex-wrap: wrap; }
+.cpg-modal-box .erp-input, .cpg-modal-box .erp-select { width: 100%; min-width: 0; }
diff --git a/tests/js/README.md b/tests/js/README.md
new file mode 100644
index 0000000..8cf25bd
--- /dev/null
+++ b/tests/js/README.md
@@ -0,0 +1,15 @@
+# 박스 계산 화면 UI 테스트 (jsdom)
+
+`app/modules/cupang/templates/cupang/box_calc.html` 의 드래그 분배·수량 대화상자·
+잔여 계산을 브라우저 없이 검증한다. 서버 API 응답은 고정값으로 대체한다.
+
+```bash
+# 1) 템플릿을 HTML 로 렌더 (프로젝트 루트에서)
+python tests/js/render_box_calc.py            # → tests/js/.out/box_calc_render.html
+
+# 2) jsdom 설치 후 실행
+npm install jsdom
+node tests/js/box_calc_ui.test.js
+```
+
+성공하면 마지막 줄에 `ALL PASS`, 실패하면 실패한 항목명이 출력되고 종료코드 1.
diff --git a/tests/js/box_calc_ui.test.js b/tests/js/box_calc_ui.test.js
new file mode 100644
index 0000000..84b9d4a
--- /dev/null
+++ b/tests/js/box_calc_ui.test.js
@@ -0,0 +1,139 @@
+const fs = require("fs");
+const { JSDOM } = require("jsdom");
+
+const path = require("path");
+const RENDER = path.join(__dirname, ".out", "box_calc_render.html");
+const html = fs.readFileSync(RENDER, "utf8");   // 먼저 render_box_calc.py 실행
+
+// 서버 응답 고정: 미라네 1호 18개(2박스+자투리2), 미라네 4호 12개(1박스+자투리4)
+const apiResponse = {
+  results: [
+    {product_code:"MS-1001", product_name:"미라네 1호 세트", box_name:"쿠팡박스", units_per_box:8,
+     quantity:18, configured:true, full_boxes:2, remainder_units:2, required_boxes:3},
+    {product_code:"MS-1004", product_name:"미라네 4호 세트", box_name:"쿠팡박스", units_per_box:8,
+     quantity:12, configured:true, full_boxes:1, remainder_units:4, required_boxes:2},
+  ],
+  totals: [],
+  mixes: [{box_name:"쿠팡박스", box_count:1, leftover_units:6, boxes:[
+    {items:[{product_code:"MS-1004",product_name:"미라네 4호 세트",quantity:4},
+            {product_code:"MS-1001",product_name:"미라네 1호 세트",quantity:2}], fill_percent:75.0}]}],
+  grand_total_boxes: 4,
+};
+
+const dom = new JSDOM(html, { runScripts: "dangerously", pretendToBeVisual: true });
+const w = dom.window, d = w.document;
+w.fetch = () => Promise.resolve({ ok: true, json: () => Promise.resolve(apiResponse) });
+
+const fails = [];
+function check(name, cond, extra) {
+  if (cond) console.log("PASS  " + name);
+  else { console.log("FAIL  " + name + (extra ? "  → " + extra : "")); fails.push(name); }
+}
+const $ = (s) => d.querySelector(s);
+const $$ = (s) => Array.from(d.querySelectorAll(s));
+const text = (s) => ($(s) ? $(s).textContent.replace(/\s+/g, " ").trim() : "<none>");
+
+function fire(el, type, init) { el.dispatchEvent(new w.Event(type, Object.assign({bubbles:true}, init))); }
+
+(async () => {
+  // ── ① 입력 → 계산 ──────────────────────────────────
+  const row1 = $(".cpg-calc-row");
+  row1.querySelector(".cpg-calc-name").value = "MS-1001";
+  row1.querySelector(".cpg-calc-qty").value = "18";
+
+  // Tab 으로 다음 행 생성 + 포커스 이동
+  const ke = new w.KeyboardEvent("keydown", { key: "Tab", bubbles: true, cancelable: true });
+  row1.querySelector(".cpg-calc-qty").dispatchEvent(ke);
+  check("Tab 이 새 행을 만든다", $$(".cpg-calc-row").length === 2, "행수=" + $$(".cpg-calc-row").length);
+  check("Tab 후 포커스가 새 행 수량", d.activeElement === $$(".cpg-calc-row")[1].querySelector(".cpg-calc-qty"));
+
+  const row2 = $$(".cpg-calc-row")[1];
+  row2.querySelector(".cpg-calc-name").value = "MS-1004";
+  row2.querySelector(".cpg-calc-qty").value = "12";
+
+  $("#cpg-calc-run").click();
+  await new Promise(r => setTimeout(r, 20));
+
+  check("요약이 표시된다", $("#cpg-sum-body").hidden === false);
+  check("제품 카드 2장", $$(".cpg-sum-prod").length === 2, String($$(".cpg-sum-prod").length));
+  check("혼합 박스 1장", $$(".cpg-box-card").length === 1);
+  check("제품별 잔여 = 2박스(16개)", text(".cpg-sum-prod .cpg-sum-prod-nums").startsWith("2박스16개"), text(".cpg-sum-prod .cpg-sum-prod-nums"));
+  check("KPI 총 박스 4", text(".cpg-kpi .cpg-kpi-value") === "4박스", text(".cpg-kpi .cpg-kpi-value"));
+
+  // ── ③ 센터는 추가한 것만 표시 ─────────────────────
+  check("초기 센터 패널 없음", $$(".cpg-dist-center").length === 0);
+  $("#cpg-center-pick").value = "1";
+  $("#cpg-center-add").click();
+  check("센터 추가 후 1개 표시", $$(".cpg-dist-center").length === 1, String($$(".cpg-dist-center").length));
+  check("추가한 센터 이름", text(".cpg-dist-center strong") === "대구3", text(".cpg-dist-center strong"));
+
+  // ── 드래그 → 드롭 → 대화상자 ──────────────────────
+  const card = $(".cpg-sum-prod[draggable='true']");
+  const dt = { data: {}, setData(t, v) { this.data[t] = v; }, getData(t) { return this.data[t]; } };
+  const ds = new w.Event("dragstart", { bubbles: true }); ds.dataTransfer = dt;
+  card.dispatchEvent(ds);
+  check("dragstart 가 key 를 싣는다", dt.getData("text/plain") === "p:MS-1001", dt.getData("text/plain"));
+
+  const zone = $(".cpg-dist-center");
+  const dov = new w.Event("dragover", { bubbles: true, cancelable: true }); dov.dataTransfer = dt;
+  zone.dispatchEvent(dov);
+  check("dragover 가 기본동작을 막는다(드롭 허용)", dov.defaultPrevented);
+
+  const drop = new w.Event("drop", { bubbles: true, cancelable: true }); drop.dataTransfer = dt;
+  zone.dispatchEvent(drop);
+  check("드롭하면 대화상자가 열린다", $("#cpg-dlg").hidden === false);
+  check("대화상자에 잔여/개수 표시", text("#cpg-dlg-item").includes("잔여 2박스 (16개)"), text("#cpg-dlg-item"));
+  check("대화상자 센터 = 드롭한 센터", $("#cpg-dlg-center").value === "1");
+
+  // 1박스만 담기
+  $("#cpg-dlg-qty").value = "1";
+  $("#cpg-dlg-ok").click();
+  check("대화상자가 닫힌다", $("#cpg-dlg").hidden === true);
+  check("센터에 항목 1줄", $$(".cpg-dist-item").length === 1);
+  check("센터 항목에 박스·개수 표시", text(".cpg-dist-item .cpg-dist-unit") === "박스 · 8개", text(".cpg-dist-item .cpg-dist-unit"));
+  check("센터 합계 배지 1박스/8개", text(".cpg-dist-sum").startsWith("1박스 8개✕") || text(".cpg-dist-sum").startsWith("1박스8개"), text(".cpg-dist-sum"));
+  check("요약 잔여가 1박스로 줄어든다", text(".cpg-sum-prod .cpg-sum-prod-nums").startsWith("1박스8개"), text(".cpg-sum-prod .cpg-sum-prod-nums"));
+  check("KPI 센터 배분 1박스", $$(".cpg-kpi-value")[1].textContent === "1박스", $$(".cpg-kpi-value")[1].textContent);
+
+  // ── 잔여 전부 담기 ────────────────────────────────
+  $$(".cpg-sum-prod")[0].click();          // 클릭 대체 경로
+  check("클릭으로도 대화상자가 열린다", $("#cpg-dlg").hidden === false);
+  $("#cpg-dlg-all").click();
+  check("전량 담기 후 잔여 0", text(".cpg-sum-prod .cpg-sum-prod-nums").startsWith("0박스0개"), text(".cpg-sum-prod .cpg-sum-prod-nums"));
+  check("잔여 0 카드는 드래그 불가", $$(".cpg-sum-prod")[0].getAttribute("draggable") === null);
+  check("센터 합계 2박스/16개", text(".cpg-dist-sum").replace(/\s/g,"").startsWith("2박스16개"), text(".cpg-dist-sum"));
+
+  // ── 수량 직접 수정 (상한 = 잔여+자기수량) ─────────
+  const qty = $(".cpg-dist-item .cpg-dist-qty");
+  qty.value = "5"; fire(qty, "input");
+  check("잔여 초과 입력은 최대치로 잘림", qty.value === "2", qty.value);
+
+  qty.value = "1"; fire(qty, "input");
+  check("수량 줄이면 개수 표시 갱신", text(".cpg-dist-item .cpg-dist-unit") === "박스 · 8개", text(".cpg-dist-item .cpg-dist-unit"));
+  check("수량 줄이면 요약 잔여 복귀", text(".cpg-sum-prod .cpg-sum-prod-nums").startsWith("1박스8개"), text(".cpg-sum-prod .cpg-sum-prod-nums"));
+
+  // ── 혼합 박스 담기 ────────────────────────────────
+  const mix = $(".cpg-box-card[draggable='true']");
+  const dt2 = { data:{}, setData(t,v){this.data[t]=v;}, getData(t){return this.data[t];} };
+  const ds2 = new w.Event("dragstart", { bubbles: true }); ds2.dataTransfer = dt2;
+  mix.dispatchEvent(ds2);
+  const drop2 = new w.Event("drop", { bubbles: true, cancelable: true }); drop2.dataTransfer = dt2;
+  $(".cpg-dist-center").dispatchEvent(drop2);
+  check("혼합 박스도 대화상자가 열린다", $("#cpg-dlg").hidden === false);
+  check("혼합 박스 잔여 1박스(6개)", text("#cpg-dlg-item").includes("잔여 1박스 (6개)"), text("#cpg-dlg-item"));
+  $("#cpg-dlg-ok").click();
+  check("혼합 박스가 센터에 담긴다", $$(".cpg-dist-item").length === 2);
+  check("혼합 담은 뒤 배분됨 표시", $(".cpg-box-card").className.includes("is-done"));
+
+  // ── 항목 빼기 / 센터 빼기 ─────────────────────────
+  $$(".cpg-dist-del")[1].click();
+  check("항목 빼면 줄이 사라진다", $$(".cpg-dist-item").length === 1);
+  check("항목 빼면 혼합 박스 복귀", !$(".cpg-box-card").className.includes("is-done"));
+
+  $(".cpg-dist-close").click();
+  check("센터 빼기", $$(".cpg-dist-center").length === 0);
+  check("센터 빼면 전량 잔여 복귀", text(".cpg-sum-prod .cpg-sum-prod-nums").startsWith("2박스16개"), text(".cpg-sum-prod .cpg-sum-prod-nums"));
+
+  console.log("\n" + (fails.length ? "FAILED: " + fails.join(" | ") : "ALL PASS"));
+  process.exit(fails.length ? 1 : 0);
+})();
diff --git a/tests/js/render_box_calc.py b/tests/js/render_box_calc.py
new file mode 100644
index 0000000..419fc1f
--- /dev/null
+++ b/tests/js/render_box_calc.py
@@ -0,0 +1,39 @@
+"""box_calc.html 을 테스트용 HTML 로 렌더한다 (erp_base.html 은 최소 스텁으로 대체)."""
+
+from __future__ import annotations
+
+import io
+import os
+
+import jinja2
+
+ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+OUT_DIR = os.path.join(ROOT, "tests", "js", ".out")
+
+BASE_STUB = "{% block head_extra %}{% endblock %}<body>{% block content %}{% endblock %}</body>"
+
+BOX_RULES = [
+    {"product_code": "MS-1001", "product_name_snapshot": "미라네 1호 세트",
+     "box_name": "쿠팡박스", "units_per_box": 8},
+    {"product_code": "MS-1004", "product_name_snapshot": "미라네 4호 세트",
+     "box_name": "쿠팡박스", "units_per_box": 8},
+]
+CENTERS = [{"id": 1, "name": "대구3"}, {"id": 2, "name": "인천32"}]
+
+
+def main() -> None:
+    env = jinja2.Environment(
+        loader=jinja2.ChoiceLoader([
+            jinja2.DictLoader({"erp_base.html": BASE_STUB}),
+            jinja2.FileSystemLoader(os.path.join(ROOT, "app", "modules", "cupang", "templates")),
+        ])
+    )
+    html = env.get_template("cupang/box_calc.html").render(box_rules=BOX_RULES, centers=CENTERS)
+    os.makedirs(OUT_DIR, exist_ok=True)
+    path = os.path.join(OUT_DIR, "box_calc_render.html")
+    io.open(path, "w", encoding="utf-8", newline="\n").write(html)
+    print("rendered:", path)
+
+
+if __name__ == "__main__":
+    main()