diff --git a/src/frontend/src/views/templates/FactorParamDetailLayout.vue b/src/frontend/src/views/templates/FactorParamDetailLayout.vue
index a45afe00..483ef004 100644
--- a/src/frontend/src/views/templates/FactorParamDetailLayout.vue
+++ b/src/frontend/src/views/templates/FactorParamDetailLayout.vue
@@ -73,136 +73,214 @@ onMounted(loadFactors);
 </script>
 
 <template>
-  <div class="split-layout-container">
-    <!-- 좌측 마스터 테이블 영역 -->
-    <div class="master-panel">
-      <div class="panel-header">
-        <h3 class="panel-title">📊 팩터 수식 원장 (factor_version_history)</h3>
-        <span class="panel-subtitle">수식을 클릭하면 우측 상세 매개변수가 바인딩됩니다.</span>
-      </div>
-      <div class="panel-body">
-        <table class="douzone-grid-table">
-          <thead>
-            <tr>
-              <th>팩터 ID</th>
-              <th>수식 명칭</th>
-              <th>카테고리</th>
-              <th>보정 상태</th>
-            </tr>
-          </thead>
-          <tbody>
-            <tr v-for="item in factors" :key="item.factor_id" 
-                @click="selectFactor(item)"
-                :class="{ 'selected-row': selectedFactor?.factor_id === item.factor_id }">
-              <td class="font-mono font-bold">{{ item.factor_id }}</td>
-              <td>{{ item.formula_name }}</td>
-              <td><span class="badge badge-category">{{ item.category }}</span></td>
-              <td>
-                <span class="badge badge-status" :class="item.calibration_state.toLowerCase()">
-                  {{ item.calibration_state }}
-                </span>
-              </td>
-            </tr>
-          </tbody>
-        </table>
-      </div>
+  <div class="split-screen-wrapper">
+    <div class="page-top-bar">
+      <h3 class="page-title">타입 A: 마스터-디테일 스플릿 화면 (Master-Detail Split View)</h3>
+      <span class="page-desc">좌측 수식 목록과 우측 파라미터 제어 폼이 6:4 비율 Split Pane으로 세분화됩니다.</span>
     </div>
 
-    <!-- 우측 디테일 폼 영역 -->
-    <div class="detail-panel" v-if="selectedFactor">
-      <div class="panel-header">
-        <h3 class="panel-title">⚙️ 임계 한도 매개변수 설정 [{{ selectedFactor.factor_id }}]</h3>
+    <!-- 2단 Split 구도 컨테이너 -->
+    <div class="split-pane-container">
+      <!-- 1. 좌측 마스터 패널 (60%) -->
+      <div class="master-panel">
+        <div class="panel-header">
+          <span class="panel-badge">Master List</span>
+          <h4 class="panel-heading">📊 팩터 수식 원장 (factor_version_history)</h4>
+        </div>
+        <div class="panel-content">
+          <table class="douzone-grid-table">
+            <thead>
+              <tr>
+                <th>팩터 ID</th>
+                <th>수식 명칭</th>
+                <th>카테고리</th>
+                <th>보정 상태</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr v-for="item in factors" :key="item.factor_id" 
+                  @click="selectFactor(item)"
+                  :class="{ 'selected-row': selectedFactor?.factor_id === item.factor_id }">
+                <td class="font-mono font-bold">{{ item.factor_id }}</td>
+                <td>{{ item.formula_name }}</td>
+                <td><span class="badge badge-category">{{ item.category }}</span></td>
+                <td>
+                  <span class="badge badge-status" :class="item.calibration_state.toLowerCase()">
+                    {{ item.calibration_state }}
+                  </span>
+                </td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
       </div>
-      <div class="panel-body form-body">
-        <div class="form-group">
-          <label class="form-label">팩터 명칭</label>
-          <input type="text" class="form-input readonly" :value="selectedFactor.formula_name" readonly />
-        </div>
-        <div class="form-group">
-          <label class="form-label">상한 Threshold (Upper Limit)</label>
-          <input type="number" class="form-input" v-model.number="selectedFactor.threshold_params.upper" />
-        </div>
-        <div class="form-group">
-          <label class="form-label">하한 Threshold (Lower Limit)</label>
-          <input type="number" class="form-input" v-model.number="selectedFactor.threshold_params.lower" />
-        </div>
-        <div class="form-group">
-          <label class="form-label">보정 상태 (Calibration State)</label>
-          <select class="form-input" v-model="selectedFactor.calibration_state">
-            <option value="CALIBRATED">CALIBRATED (검증 완료)</option>
-            <option value="OPTIMIZING">OPTIMIZING (최적화 중)</option>
-            <option value="STALE">STALE (만료됨)</option>
-          </select>
-        </div>
-        <button class="btn-save-action" :disabled="isSaving" @click="saveThreshold">
-          {{ isSaving ? '저장 처리 중...' : '💾 PostgreSQL 원장 업데이트 저장' }}
-        </button>
+
+      <!-- 2. 중앙 물리 스플릿 구분선 (Split Divider Bar) -->
+      <div class="split-divider">
+        <div class="divider-line"></div>
+      </div>
+
+      <!-- 3. 우측 디테일 패널 (40%) -->
+      <div class="detail-panel" v-if="selectedFactor">
+        <div class="panel-header">
+          <span class="panel-badge badge-active">Detail Form</span>
+          <h4 class="panel-heading">⚙️ 임계 한도 매개변수 설정 [{{ selectedFactor.factor_id }}]</h4>
+        </div>
+        <div class="panel-content form-container">
+          <div class="form-group">
+            <label class="form-label">팩터 식별자</label>
+            <input type="text" class="form-input readonly" :value="selectedFactor.factor_id" readonly />
+          </div>
+          <div class="form-group">
+            <label class="form-label">수식 명칭</label>
+            <input type="text" class="form-input readonly" :value="selectedFactor.formula_name" readonly />
+          </div>
+          <div class="form-group">
+            <label class="form-label">상한 Threshold (Upper Limit)</label>
+            <input type="number" class="form-input" v-model.number="selectedFactor.threshold_params.upper" />
+          </div>
+          <div class="form-group">
+            <label class="form-label">하한 Threshold (Lower Limit)</label>
+            <input type="number" class="form-input" v-model.number="selectedFactor.threshold_params.lower" />
+          </div>
+          <div class="form-group">
+            <label class="form-label">보정 상태 (Calibration State)</label>
+            <select class="form-input" v-model="selectedFactor.calibration_state">
+              <option value="CALIBRATED">CALIBRATED (검증 완료)</option>
+              <option value="OPTIMIZING">OPTIMIZING (최적화 중)</option>
+              <option value="STALE">STALE (만료됨)</option>
+            </select>
+          </div>
+          <button class="btn-save-action" :disabled="isSaving" @click="saveThreshold">
+            {{ isSaving ? '저장 처리 중...' : '💾 PostgreSQL 원장 업데이트 저장' }}
+          </button>
+        </div>
+      </div>
+
+      <!-- 선택 없을 때 스플릿 디테일 엠티 패널 -->
+      <div class="detail-panel empty-panel" v-else>
+        <div class="panel-header">
+          <span class="panel-badge">Detail Form</span>
+          <h4 class="panel-heading">⚙️ 임계 한도 매개변수 설정</h4>
+        </div>
+        <div class="empty-message-box">
+          <span class="empty-icon">👈</span>
+          <p class="empty-title">팩터 항목이 선택되지 않았습니다.</p>
+          <p class="empty-desc">좌측 마스터 테이블에서 수식 항목을 클릭하면 40% 영역에 상세 설정 폼이 바인딩됩니다.</p>
+        </div>
       </div>
-    </div>
-    <div class="detail-panel empty-panel" v-else>
-      <p>좌측 팩터 수식을 선택하면 상세 파라미터 편집 폼이 노출됩니다.</p>
     </div>
   </div>
 </template>
 
 <style scoped>
-.split-layout-container {
+.split-screen-wrapper {
   display: flex;
+  flex-direction: column;
   height: calc(100vh - 110px);
-  background-color: #F1F5F9;
-  gap: 16px;
   padding: 16px;
+  background-color: #F1F5F9;
   box-sizing: border-box;
+  gap: 12px;
 }
 
-.master-panel {
-  flex: 2;
-  background: #FFFFFF;
-  border: 1px solid #CBD5E1;
-  border-radius: 6px;
-  display: flex;
-  flex-direction: column;
-  overflow: hidden;
+.page-top-bar {
+  border-bottom: 1px solid #CBD5E1;
+  padding-bottom: 8px;
 }
 
-.detail-panel {
-  flex: 1;
-  background: #FFFFFF;
-  border: 1px solid #CBD5E1;
-  border-radius: 6px;
-  display: flex;
-  flex-direction: column;
-  overflow: hidden;
-}
-
-.empty-panel {
-  justify-content: center;
-  align-items: center;
-  color: #94A3B8;
-  font-size: 0.85rem;
-  padding: 24px;
-  text-align: center;
-}
-
-.panel-header {
-  padding: 12px 16px;
-  background-color: #F8FAFC;
-  border-bottom: 1px solid #E2E8F0;
-}
-
-.panel-title {
-  font-size: 0.9rem;
+.page-title {
+  font-size: 1rem;
   font-weight: 700;
   color: #1E293B;
   margin: 0;
 }
 
-.panel-subtitle {
+.page-desc {
   font-size: 0.75rem;
   color: #64748B;
 }
 
-.panel-body {
+.split-pane-container {
+  display: flex;
+  flex: 1;
+  width: 100%;
+  overflow: hidden;
+}
+
+.master-panel {
+  flex: 6;
+  background: #FFFFFF;
+  border: 1px solid #CBD5E1;
+  border-radius: 6px 0 0 6px;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.split-divider {
+  width: 8px;
+  background-color: #CBD5E1;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  cursor: col-resize;
+  transition: background-color 0.2s ease;
+}
+
+.split-divider:hover {
+  background-color: #2563EB;
+}
+
+.divider-line {
+  width: 2px;
+  height: 30px;
+  background-color: #94A3B8;
+  border-radius: 1px;
+}
+
+.detail-panel {
+  flex: 4;
+  background: #FFFFFF;
+  border: 1px solid #CBD5E1;
+  border-left: none;
+  border-radius: 0 6px 6px 0;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.panel-header {
+  padding: 10px 16px;
+  background-color: #F8FAFC;
+  border-bottom: 1px solid #E2E8F0;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.panel-badge {
+  font-size: 0.65rem;
+  font-weight: 700;
+  padding: 2px 6px;
+  background-color: #E2E8F0;
+  color: #475569;
+  border-radius: 3px;
+}
+
+.panel-badge.badge-active {
+  background-color: #2563EB;
+  color: #FFFFFF;
+}
+
+.panel-heading {
+  font-size: 0.85rem;
+  font-weight: 700;
+  color: #1E293B;
+  margin: 0;
+}
+
+.panel-content {
   flex: 1;
   overflow-y: auto;
   padding: 12px;
@@ -242,13 +320,8 @@ onMounted(loadFactors);
   font-weight: 700;
 }
 
-.font-mono {
-  font-family: monospace;
-}
-
-.font-bold {
-  font-weight: 700;
-}
+.font-mono { font-family: monospace; }
+.font-bold { font-weight: 700; }
 
 .badge {
   display: inline-block;
@@ -258,31 +331,21 @@ onMounted(loadFactors);
   font-weight: 700;
 }
 
-.badge-category {
-  background-color: #E2E8F0;
-  color: #475569;
-}
+.badge-category { background-color: #E2E8F0; color: #475569; }
+.badge-status.calibrated { background-color: #DCFCE7; color: #166534; }
+.badge-status.optimizing { background-color: #FEF3C7; color: #92400E; }
 
-.badge-status.calibrated {
-  background-color: #DCFCE7;
-  color: #166534;
-}
-
-.badge-status.optimizing {
-  background-color: #FEF3C7;
-  color: #92400E;
-}
-
-.form-body {
+.form-container {
   display: flex;
   flex-direction: column;
-  gap: 16px;
+  gap: 14px;
+  padding: 16px;
 }
 
 .form-group {
   display: flex;
   flex-direction: column;
-  gap: 6px;
+  gap: 4px;
 }
 
 .form-label {
@@ -297,11 +360,6 @@ onMounted(loadFactors);
   border-radius: 4px;
   font-size: 0.85rem;
   outline: none;
-  transition: border-color 0.15s ease;
-}
-
-.form-input:focus {
-  border-color: #2563EB;
 }
 
 .form-input.readonly {
@@ -319,15 +377,22 @@ onMounted(loadFactors);
   border: none;
   border-radius: 4px;
   cursor: pointer;
-  transition: background-color 0.15s ease;
 }
 
-.btn-save-action:hover {
-  background-color: #1D4ED8;
+.btn-save-action:hover { background-color: #1D4ED8; }
+
+.empty-message-box {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  padding: 24px;
+  text-align: center;
+  color: #64748B;
 }
 
-.btn-save-action:disabled {
-  background-color: #94A3B8;
-  cursor: not-allowed;
-}
+.empty-icon { font-size: 2rem; margin-bottom: 8px; }
+.empty-title { font-size: 0.9rem; font-weight: 700; color: #334155; margin: 0 0 4px 0; }
+.empty-desc { font-size: 0.75rem; color: #94A3B8; margin: 0; max-width: 240px; }
 </style>