diff --git a/src/views/account/AccountView.vue b/src/views/account/AccountView.vue
index e65625c..a3af97a 100644
--- a/src/views/account/AccountView.vue
+++ b/src/views/account/AccountView.vue
@@ -1012,8 +1012,8 @@ onMounted(async () => {
     <!-- 추가/수정 모달 -->
     <Teleport to="body">
       <Transition name="fade">
-        <div v-if="formOpen" class="modal-backdrop" @click.self="formOpen = false">
-          <div class="modal" role="dialog" aria-modal="true">
+        <div v-if="formOpen" class="modal-backdrop entry-backdrop">
+          <div class="modal entry-modal" role="dialog" aria-modal="true">
             <button class="close" type="button" @click="formOpen = false">×</button>
             <h2>{{ editId ? '내역 수정' : '내역 추가' }}</h2>
 
@@ -1661,6 +1661,27 @@ button.primary {
   font-size: 0.8rem;
   opacity: 0.6;
 }
+/* 내역 추가/수정: 전체화면 모달 — 바깥 영역이 없어 실수로 닫히지 않음(× 로만 닫힘) */
+.entry-backdrop {
+  padding: 0;
+}
+.modal.entry-modal {
+  width: 100%;
+  height: 100%;
+  max-width: none;
+  max-height: 100%;
+  border: 0;
+  border-radius: 0;
+  box-shadow: none;
+  padding-top: calc(1.5rem + env(safe-area-inset-top));
+}
+/* 넓은 화면(PC)에서도 입력 내용은 읽기 좋은 폭으로 가운데 정렬 */
+.modal.entry-modal > h2,
+.modal.entry-modal .entry-form {
+  max-width: 460px;
+  margin-left: auto;
+  margin-right: auto;
+}
 .modal {
   position: relative;
   width: 100%;
diff --git a/src/views/account/CategoryView.vue b/src/views/account/CategoryView.vue
index 5d3203c..6293600 100644
--- a/src/views/account/CategoryView.vue
+++ b/src/views/account/CategoryView.vue
@@ -65,6 +65,18 @@ async function reload() {
 // 스크롤하다 실수로 순서가 바뀌는 것 방지: 기본은 드래그 비활성, '순서변경' 버튼으로 켠다.
 const majorListEl = ref(null)
 const reorderMode = ref(false)
+
+// ===== 대분류 펼침(아코디언) — 삼각형 누르면 소분류 표시 =====
+const expanded = ref(new Set())
+function toggleExpand(id) {
+  const s = new Set(expanded.value)
+  if (s.has(id)) s.delete(id)
+  else s.add(id)
+  expanded.value = s
+}
+function isExpanded(id) {
+  return expanded.value.has(id)
+}
 let sortables = []
 function destroySortables() {
   sortables.forEach((s) => s.destroy())
@@ -128,9 +140,16 @@ async function addCategory() {
   if (!name) return
   error.value = null
   try {
-    await accountApi.createCategory({ type: activeType.value, name, parentId: newParent.value || null })
+    const parentId = newParent.value || null
+    await accountApi.createCategory({ type: activeType.value, name, parentId })
     newName.value = ''
     await reload()
+    // 소분류를 추가했으면 그 대분류를 펼쳐 바로 보이게
+    if (parentId) {
+      const s = new Set(expanded.value)
+      s.add(Number(parentId))
+      expanded.value = s
+    }
   } catch (e) {
     showError(e, '추가에 실패했습니다.')
   }
@@ -226,12 +245,18 @@ onBeforeUnmount(destroySortables)
         <div class="cat-row major-row">
           <div class="cat-main">
             <span v-show="reorderMode" class="drag-handle major-handle" title="대분류 순서 변경(소분류 함께 이동)">≡</span>
+            <button
+              type="button" class="expand-btn" :class="{ open: isExpanded(g.major.id), empty: !g.children.length }"
+              :title="g.children.length ? (isExpanded(g.major.id) ? '소분류 접기' : '소분류 펼치기') : '소분류 없음'"
+              :disabled="!g.children.length" @click="toggleExpand(g.major.id)"
+            >▶</button>
             <input v-model="g.major.name" class="cat-name" @keyup.enter="saveCategory(g.major)" />
+            <span v-if="g.children.length && !isExpanded(g.major.id)" class="sub-count">{{ g.children.length }}</span>
             <IconBtn icon="check" title="저장" size="sm" @click="saveCategory(g.major)" />
             <IconBtn icon="trash" title="삭제" variant="danger" size="sm" @click="removeCategory(g.major)" />
           </div>
         </div>
-        <ul class="sub-list" :data-parent="g.major.id">
+        <ul v-show="isExpanded(g.major.id) || reorderMode" class="sub-list" :data-parent="g.major.id">
           <li v-for="s in g.children" :key="s.id" :data-id="s.id" class="sub-item cat-row child">
             <div class="cat-main">
               <span v-show="reorderMode" class="drag-handle sub-handle" title="소분류 순서 변경">≡</span>
@@ -440,6 +465,37 @@ button.danger {
 .sub-mark {
   opacity: 0.45;
 }
+/* 대분류 펼침 삼각형 */
+.expand-btn {
+  flex: none;
+  width: 1.4rem;
+  height: 1.4rem;
+  border: 0;
+  background: transparent;
+  color: var(--color-text);
+  font-size: 0.7rem;
+  cursor: pointer;
+  transition: transform 0.15s ease;
+  opacity: 0.7;
+}
+.expand-btn.open {
+  transform: rotate(90deg);
+}
+.expand-btn.empty {
+  opacity: 0.15;
+  cursor: default;
+}
+.sub-count {
+  flex: none;
+  min-width: 1.2rem;
+  text-align: center;
+  font-size: 0.72rem;
+  padding: 0.05rem 0.3rem;
+  border-radius: 999px;
+  background: var(--color-border);
+  color: var(--color-text);
+  opacity: 0.75;
+}
 .hint.sm {
   font-size: 0.78rem;
   margin: 0 0 0.75rem;