diff --git a/frontend/current_screen.png b/frontend/current_screen.png
index 2e00bea8..8e3924e2 100644
Binary files a/frontend/current_screen.png and b/frontend/current_screen.png differ
diff --git a/frontend/src/shared/ui/components/KsSplitter.vue b/frontend/src/shared/ui/components/KsSplitter.vue
new file mode 100644
index 00000000..0ff0ff92
--- /dev/null
+++ b/frontend/src/shared/ui/components/KsSplitter.vue
@@ -0,0 +1,197 @@
+<script setup lang="ts">
+import { ref, onMounted, watch } from 'vue'
+
+const props = withDefaults(
+  defineProps<{
+    storageKey?: string
+    initialRatio?: number // percentage for left panel, e.g. 65 (meaning 65% master, 35% detail)
+    minLeftPx?: number
+    minRightPx?: number
+  }>(),
+  {
+    storageKey: 'ks_splitter_ratio_default',
+    initialRatio: 65,
+    minLeftPx: 280,
+    minRightPx: 300,
+  }
+)
+
+const emit = defineEmits<{
+  'update:ratio': [value: number]
+}>()
+
+const leftRatio = ref<number>(props.initialRatio)
+const isDragging = ref(false)
+const containerRef = ref<HTMLElement | null>(null)
+
+// Restore saved ratio from localStorage
+onMounted(() => {
+  if (props.storageKey) {
+    const saved = localStorage.getItem(props.storageKey)
+    if (saved) {
+      const parsed = parseFloat(saved)
+      if (!isNaN(parsed) && parsed >= 15 && parsed <= 85) {
+        leftRatio.value = parsed
+      }
+    }
+  }
+})
+
+// Watch ratio changes to save to localStorage
+watch(leftRatio, (newRatio) => {
+  if (props.storageKey) {
+    localStorage.setItem(props.storageKey, newRatio.toFixed(2))
+  }
+  emit('update:ratio', newRatio)
+})
+
+let startX = 0
+let startLeftWidth = 0
+let containerWidth = 0
+
+const startDrag = (e: MouseEvent | TouchEvent) => {
+  if (!containerRef.value) return
+  isDragging.value = true
+
+  const clientX = 'touches' in e ? e.touches[0].clientX : e.clientX
+  startX = clientX
+  containerWidth = containerRef.value.getBoundingClientRect().width
+  startLeftWidth = (containerWidth * leftRatio.value) / 100
+
+  document.addEventListener('mousemove', onDrag)
+  document.addEventListener('mouseup', stopDrag)
+  document.addEventListener('touchmove', onDrag)
+  document.addEventListener('touchend', stopDrag)
+  document.body.style.cursor = 'col-resize'
+  document.body.style.userSelect = 'none'
+}
+
+const onDrag = (e: MouseEvent | TouchEvent) => {
+  if (!isDragging.value || containerWidth <= 0) return
+  const clientX = 'touches' in e ? e.touches[0].clientX : e.clientX
+  const deltaX = clientX - startX
+  let newLeftPx = startLeftWidth + deltaX
+
+  // Enforce min widths
+  if (newLeftPx < props.minLeftPx) {
+    newLeftPx = props.minLeftPx
+  }
+  if (containerWidth - newLeftPx < props.minRightPx) {
+    newLeftPx = containerWidth - props.minRightPx
+  }
+
+  const newRatio = (newLeftPx / containerWidth) * 100
+  leftRatio.value = Math.min(Math.max(newRatio, 15), 85)
+}
+
+const stopDrag = () => {
+  if (!isDragging.value) return
+  isDragging.value = false
+  document.removeEventListener('mousemove', onDrag)
+  document.removeEventListener('mouseup', stopDrag)
+  document.removeEventListener('touchmove', onDrag)
+  document.removeEventListener('touchend', stopDrag)
+  document.body.style.cursor = ''
+  document.body.style.userSelect = ''
+}
+
+const handleDoubleClick = () => {
+  // Reset to initial ratio on double click
+  leftRatio.value = props.initialRatio
+}
+</script>
+
+<template>
+  <div ref="containerRef" class="ks-splitter" :class="{ 'is-dragging': isDragging }">
+    <!-- Left / Master Pane -->
+    <div class="ks-splitter__pane ks-splitter__pane--left" :style="{ width: `calc(${leftRatio}% - 4px)` }">
+      <slot name="left" />
+    </div>
+
+    <!-- Resizer Handle Bar -->
+    <div
+      class="ks-splitter__resizer"
+      role="separator"
+      tabindex="0"
+      aria-label="패널 크기 조절"
+      title="드래그하여 크기 조절 (더블클릭 시 초기화)"
+      @mousedown="startDrag"
+      @touchstart="startDrag"
+      @dblclick="handleDoubleClick"
+    >
+      <div class="ks-splitter__resizer-handle">
+        <span></span>
+        <span></span>
+        <span></span>
+      </div>
+    </div>
+
+    <!-- Right / Detail Pane -->
+    <div class="ks-splitter__pane ks-splitter__pane--right" :style="{ width: `calc(${100 - leftRatio}% - 4px)` }">
+      <slot name="right" />
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.ks-splitter {
+  display: flex;
+  width: 100%;
+  height: 100%;
+  min-height: 0;
+  flex: 1;
+  position: relative;
+  overflow: hidden;
+}
+
+.ks-splitter__pane {
+  min-width: 0;
+  min-height: 0;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.ks-splitter__resizer {
+  width: 8px;
+  height: 100%;
+  background: var(--ks-color-canvas, #f8fafc);
+  border-left: 1px solid var(--ks-color-border, #e2e8f0);
+  border-right: 1px solid var(--ks-color-border, #e2e8f0);
+  cursor: col-resize;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  z-index: 10;
+  transition: background-color 0.15s ease, border-color 0.15s ease;
+  user-select: none;
+}
+
+.ks-splitter__resizer:hover,
+.ks-splitter.is-dragging .ks-splitter__resizer {
+  background: #e0f2fe;
+  border-color: var(--ks-color-action, #2563eb);
+}
+
+.ks-splitter__resizer-handle {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  padding: 4px 0;
+}
+
+.ks-splitter__resizer-handle span {
+  width: 2px;
+  height: 2px;
+  border-radius: 50%;
+  background-color: var(--ks-color-neutral-400, #94a3b8);
+  transition: background-color 0.15s ease;
+}
+
+.ks-splitter__resizer:hover .ks-splitter__resizer-handle span,
+.ks-splitter.is-dragging .ks-splitter__resizer-handle span {
+  background-color: var(--ks-color-action, #2563eb);
+}
+</style>
diff --git a/frontend/src/shared/ui/components/index.ts b/frontend/src/shared/ui/components/index.ts
index 67b42f18..34698073 100644
--- a/frontend/src/shared/ui/components/index.ts
+++ b/frontend/src/shared/ui/components/index.ts
@@ -23,3 +23,4 @@ export { default as KsFormGrid } from './KsFormGrid.vue'
 export { default as KsFormSection } from './KsFormSection.vue'
 export { default as KsFormSpan } from './KsFormSpan.vue'
 export { default as KsValidationSummary } from './KsValidationSummary.vue'
+export { default as KsSplitter } from './KsSplitter.vue'
diff --git a/frontend/src/shared/ui/screen-types/v2/MasterDetailCrudPage.vue b/frontend/src/shared/ui/screen-types/v2/MasterDetailCrudPage.vue
index 35010950..cbf88959 100644
--- a/frontend/src/shared/ui/screen-types/v2/MasterDetailCrudPage.vue
+++ b/frontend/src/shared/ui/screen-types/v2/MasterDetailCrudPage.vue
@@ -1,2 +1,2 @@
-<script setup lang="ts">import { computed } from 'vue'; import PageLayout from '../../layouts/PageLayout.vue'; import StandardScreenBoundary from './StandardScreenBoundary.vue'; import type { StandardScreenProps } from '../../contracts/screenContract'; const props=defineProps<StandardScreenProps>(); const hideDetail = computed(() => props.state === 'UNAUTHORIZED' || props.state === 'FORBIDDEN'); defineEmits<{retry:[]}>()</script>
-<template><PageLayout :title="props.title" :subtitle="props.subtitle" :status="props.state" :as-of="props.evidence?.asOf" :version="props.evidence?.version" aside-width="28rem"><template v-if="$slots.actions" #actions><slot name="actions"/></template><template v-if="$slots.filters" #filters><slot name="filters"/></template><StandardScreenBoundary :state="props.state" :warning="props.warning" @retry="$emit('retry')"><slot name="master"/></StandardScreenBoundary><template #aside><slot v-if="!hideDetail" name="detail"/></template><template v-if="$slots.footer" #footer><slot name="footer"/></template></PageLayout></template>
+<script setup lang="ts">import { computed } from 'vue'; import PageLayout from '../../layouts/PageLayout.vue'; import StandardScreenBoundary from './StandardScreenBoundary.vue'; import KsSplitter from '../../components/KsSplitter.vue'; import type { StandardScreenProps } from '../../contracts/screenContract'; const props=defineProps<StandardScreenProps & { storageKey?: string }>(); const hideDetail = computed(() => props.state === 'UNAUTHORIZED' || props.state === 'FORBIDDEN'); defineEmits<{retry:[]}>()</script>
+<template><PageLayout :title="props.title" :subtitle="props.subtitle" :status="props.state" :as-of="props.evidence?.asOf" :version="props.evidence?.version"><template v-if="$slots.actions" #actions><slot name="actions"/></template><template v-if="$slots.filters" #filters><slot name="filters"/></template><StandardScreenBoundary :state="props.state" :warning="props.warning" @retry="$emit('retry')"><KsSplitter :storage-key="props.storageKey ?? 'ks_splitter_master_detail'"><template #left><slot name="master"/></template><template #right><slot v-if="!hideDetail" name="detail"/></template></KsSplitter></StandardScreenBoundary><template v-if="$slots.footer" #footer><slot name="footer"/></template></PageLayout></template>