diff --git a/A00_Common/spreadsheet/spreadsheet.css b/A00_Common/spreadsheet/spreadsheet.css
index 1266725d..9f068cd6 100644
--- a/A00_Common/spreadsheet/spreadsheet.css
+++ b/A00_Common/spreadsheet/spreadsheet.css
@@ -109,3 +109,151 @@
   background: #24292f;
   color: #fff;
 }
+
+/* 2단계 잇기 — 서식 붓 · 찾기 패널 · 메모 · 골라 붙여넣기 */
+.ss-brush {
+  flex: none;
+  padding: 0 8px;
+  border: none;
+  border-right: 1px solid #d0d7de;
+  background: none;
+  font: inherit;
+  cursor: pointer;
+}
+
+.ss-brush.is-on {
+  background: #dafbe1;
+  box-shadow: inset 0 0 0 2px #217346;
+}
+
+.ss--painting .ss-grid-host {
+  cursor: copy;
+}
+
+.ss-find {
+  position: absolute;
+  top: 4px;
+  right: 16px;
+  z-index: 20;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  padding: 8px;
+  border: 1px solid #d0d7de;
+  border-radius: 6px;
+  background: #fff;
+  box-shadow: 0 4px 12px rgb(0 0 0 / 15%);
+}
+
+.ss-find[hidden],
+.ss-find__row[hidden],
+.ss-memo[hidden],
+.ss-pick[hidden],
+.spreadsheet-comment-balloon[hidden] {
+  display: none;
+}
+
+.ss-find__row {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.ss-find__input {
+  width: 180px;
+  padding: 2px 6px;
+  border: 1px solid #d0d7de;
+  font: inherit;
+}
+
+.ss-find__btn {
+  padding: 2px 8px;
+  border: 1px solid #d0d7de;
+  border-radius: 4px;
+  background: #f6f8fa;
+  font: inherit;
+  cursor: pointer;
+}
+
+.ss-find__opt {
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  font-size: 12px;
+}
+
+.ss-find__status {
+  font-size: 12px;
+  color: #57606a;
+}
+
+.ss-memo,
+.spreadsheet-comment-balloon {
+  position: absolute;
+  z-index: 15;
+  min-width: 140px;
+  max-width: 260px;
+  padding: 4px 6px;
+  border: 1px solid #bf8700;
+  background: #fff8c5;
+  font: inherit;
+  white-space: pre-wrap;
+  box-shadow: 0 2px 6px rgb(0 0 0 / 15%);
+}
+
+.ss-memo {
+  min-height: 60px;
+  resize: both;
+  outline: none;
+}
+
+.ss-pick {
+  position: absolute;
+  z-index: 20;
+  display: flex;
+  gap: 2px;
+  padding: 4px;
+  border: 1px solid #d0d7de;
+  background: #fff;
+  box-shadow: 0 4px 12px rgb(0 0 0 / 15%);
+}
+
+.ss-pick > button {
+  padding: 2px 8px;
+  border: 1px solid #d0d7de;
+  background: #f6f8fa;
+  font: inherit;
+  cursor: pointer;
+}
+
+/* 함수 자동 완성 · 인자 도움말 */
+.ss-hint {
+  position: absolute;
+  z-index: 6;
+  min-width: 200px;
+  max-width: 360px;
+  border: 1px solid #d0d7de;
+  background: #fff;
+  font-size: 12px;
+  box-shadow: 0 4px 12px rgb(0 0 0 / 15%);
+}
+
+.ss-hint[hidden] {
+  display: none;
+}
+
+.ss-hint__item,
+.ss-hint__help {
+  padding: 2px 6px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.ss-hint__item {
+  cursor: pointer;
+}
+
+.ss-hint__item.is-on {
+  background: #ddf4ff;
+}
diff --git a/A00_Common/spreadsheet/spreadsheet.ts b/A00_Common/spreadsheet/spreadsheet.ts
index 25f43b0e..1597924a 100644
--- a/A00_Common/spreadsheet/spreadsheet.ts
+++ b/A00_Common/spreadsheet/spreadsheet.ts
@@ -7,6 +7,7 @@
  * ⚠ M02 만 `import()` 로 불러옴 — 정적 import 금지(다른 페이지 번들에 안 섞이게).
  * 저장은 부른 쪽 몫(`onChange` 로 문서 · 자동저장 없음 · [저장] 때 서버가 Node 로 다시 풂).
  * 화면 차례: 도구 모음(E) · 주소 상자 + 수식 입력줄(D) · 격자(C) · 시트 탭(E).
+ * 2단계 부품(찾기 · 메모 · 서식 붓 · 골라 붙여넣기)은 `spreadsheet_extras.ts` 로 이음.
  * ========================================================================== */
 
 import "./spreadsheet.css";
@@ -15,6 +16,7 @@ import { parseA1, rangeToA1, toA1 } from "./spreadsheet_address";
 import { attachClipboard } from "./spreadsheet_clipboard";
 import { applyCommand, CommandError } from "./spreadsheet_commands";
 import { createEditor } from "./spreadsheet_editor";
+import { attachExtras } from "./spreadsheet_extras";
 import { createCalcEngine } from "./spreadsheet_graph";
 import { createGrid } from "./spreadsheet_grid";
 import { createHistory } from "./spreadsheet_history";
@@ -70,18 +72,6 @@ export interface SpreadsheetHandle {
   destroy(): void;
 }
 
-/** 이어 붙이는 남의 부품 — 시험 틀이 빈 몸 부품을 가짜로 바꿔 끼우는 자리(화면 코드는 그대로 씀) */
-export const parts = {
-  createCalcEngine,
-  createHistory,
-  applyCommand,
-  createGrid,
-  mountToolbar,
-  mountTabs,
-  attachMenu,
-  attachClipboard,
-};
-
 /** 움직이는 끝(닻에서 먼 쪽) — 행열 전체면 활성 칸 쪽 */
 function farCorner(sel: Selection): { r: number; c: number } {
   const g = sel.범위[0];
@@ -117,8 +107,8 @@ export function createSpreadsheet(
     root,
     book,
     readOnly,
-    engine: parts.createCalcEngine(book),
-    history: parts.createHistory(),
+    engine: createCalcEngine(book),
+    history: createHistory(),
     selection: selectCell(firstSheet(book), 0, 0),
     sheet: () => ctx.book.시트.find((s) => s.id === ctx.selection.시트) ?? ctx.book.시트[0],
     dispatch,
@@ -130,20 +120,22 @@ export function createSpreadsheet(
     editor: null as unknown as EditorHandle,
   };
 
-  const grid = parts.createGrid(ctx);
+  const grid = createGrid(ctx);
   ctx.grid = grid;
   const ed = createEditor(ctx);
   ctx.editor = ed;
-  const toolbar: PartHandle | null = readOnly ? null : parts.mountToolbar(ctx);
-  const tabs = parts.mountTabs(ctx);
-  const menu: PartHandle | null = readOnly ? null : parts.attachMenu(ctx);
-  const clip = parts.attachClipboard(ctx);
+  const toolbar: PartHandle | null = readOnly ? null : mountToolbar(ctx);
+  const tabs = mountTabs(ctx);
+  const menu: PartHandle | null = readOnly ? null : attachMenu(ctx);
+  const clip = attachClipboard(ctx);
   const others = [toolbar, tabs, menu, clip].filter((p): p is PartHandle => !!p);
 
   grid.root.classList.add("ss-grid-host");
   for (const node of [toolbar?.root, ed.bar, grid.root, tabs.root]) if (node) root.append(node);
-  const detachKeys = attachKeys(ctx, ed);
-  const detachMouse = attachMouse(ctx, ed);
+  const extras = attachExtras(ctx, ed, toolbar?.root ?? null);
+  others.push(...extras.parts);
+  const detachKeys = attachKeys(ctx, ed, extras.keys);
+  const detachMouse = attachMouse(ctx, ed, extras.mouse);
   const toast = el("div", { className: "ss-toast" });
   let toastTimer = 0;
 
@@ -160,7 +152,7 @@ export function createSpreadsheet(
 
   function apply(command: Command): CommandEffect | null {
     try {
-      return parts.applyCommand(ctx.book, command);
+      return applyCommand(ctx.book, command);
     } catch (e) {
       if (e instanceof CommandError) return (notify(e.message), null);
       throw e;
diff --git a/A00_Common/spreadsheet/spreadsheet_commands.ts b/A00_Common/spreadsheet/spreadsheet_commands.ts
index 5eee4ddb..e89a56a8 100644
--- a/A00_Common/spreadsheet/spreadsheet_commands.ts
+++ b/A00_Common/spreadsheet/spreadsheet_commands.ts
@@ -18,7 +18,15 @@ import {
   rangeToA1,
   toA1,
 } from "./spreadsheet_address";
+import {
+  addSheet,
+  moveSheet,
+  removeSheet,
+  renameSheet,
+  replaceSheet,
+} from "./spreadsheet_commands_sheet";
 import { shiftForCommand, shiftSpan } from "./spreadsheet_refshift";
+import { applyFilter, applySort, shiftFilter } from "./spreadsheet_sortfilter";
 import { MAX_COLS, MAX_ROWS } from "./spreadsheet_types";
 import type {
   Cell,
@@ -34,11 +42,11 @@ import type {
 /** 막힌 명령(병합 가름 · 마지막 시트 지우기 · 같은 시트 이름 …) — 화면이 `message` 를 알림 */
 export class CommandError extends Error {}
 
-type Of<K extends Command["종류"]> = Extract<Command, { 종류: K }>;
+export type Of<K extends Command["종류"]> = Extract<Command, { 종류: K }>;
 
-const clone = <T>(x: T): T => structuredClone(x);
+export const clone = <T>(x: T): T => structuredClone(x);
 
-function sheetOf(book: Workbook, id: string): Sheet {
+export function sheetOf(book: Workbook, id: string): Sheet {
   const s = book.시트.find((x) => x.id === id);
   if (!s) throw new CommandError(`없는 시트: ${id}`);
   return s;
@@ -107,7 +115,7 @@ function setSheetDefault(s: Sheet, key: "서식" | "열폭" | "행높이", value
 const addr = (시트: string, r: number, c: number): SheetCellAddress => ({ 시트, r, c });
 
 /** 바뀐 시트만 통째 되돌림 짝 */
-function restoreChanged(book: Workbook, old: Sheet[]): Command[] {
+export function restoreChanged(book: Workbook, old: Sheet[]): Command[] {
   const out: Command[] = [];
   for (const o of old) {
     const now = book.시트.find((x) => x.id === o.id);
@@ -117,20 +125,12 @@ function restoreChanged(book: Workbook, old: Sheet[]): Command[] {
 }
 
 /** 모든 식 글을 명령에 맞춰 고침 — 시트 이름을 바꾸기 전에 부름 */
-function rewriteAll(book: Workbook, command: Command) {
+export function rewriteAll(book: Workbook, command: Command) {
   for (const s of book.시트)
     for (const cell of Object.values(s.칸))
       if (cell.식 !== undefined) cell.식 = shiftForCommand(cell.식, s.id, command, book);
 }
 
-function checkSheetName(book: Workbook, name: string, self?: string) {
-  if (!name.trim() || name.length > 31) throw new CommandError("시트 이름은 1~31 글자");
-  if (/[[\]:*?/\\]/.test(name) || name.startsWith("'") || name.endsWith("'"))
-    throw new CommandError("시트 이름에 못 쓰는 글자: [ ] : * ? / \\ 와 앞뒤 '");
-  if (book.시트.some((s) => s.id !== self && s.이름.toLowerCase() === name.toLowerCase()))
-    throw new CommandError(`같은 이름 시트가 있음: ${name}`);
-}
-
 // ── 칸 ────────────────────────────────────────────────────────────────────
 
 function setCells(book: Workbook, cmd: Of<"칸">): CommandEffect {
@@ -332,6 +332,7 @@ function insertDelete(
     }
   }
 
+  shiftFilter(s, rows, insert, at, n);
   const key = rows ? "행" : "열";
   const frozen = s.틀고정?.[key];
   if (frozen && at < frozen)
@@ -484,61 +485,6 @@ function sheetSize(s: Sheet, axis: "행" | "열", value: number | null): Command
   return { undo: { 종류: "시트통째", 시트: before }, cells: [], rebuild: false };
 }
 
-// ── 시트 ────────────────────────────────────────────────────────────────────
-
-function addSheet(book: Workbook, cmd: Of<"시트더하기">): CommandEffect {
-  if (book.시트.some((s) => s.id === cmd.시트.id))
-    throw new CommandError(`같은 id 시트가 있음: ${cmd.시트.id}`);
-  checkSheetName(book, cmd.시트.이름);
-  book.시트.splice(Math.max(0, Math.min(cmd.자리, book.시트.length)), 0, clone(cmd.시트));
-  return { undo: { 종류: "시트지우기", 시트: cmd.시트.id }, cells: [], rebuild: true };
-}
-
-function removeSheet(book: Workbook, cmd: Of<"시트지우기">): CommandEffect {
-  const s = sheetOf(book, cmd.시트);
-  if (book.시트.length === 1) throw new CommandError("마지막 시트는 못 지움");
-  const at = book.시트.indexOf(s);
-  const old = book.시트.map(clone);
-  rewriteAll(book, cmd);
-  book.시트.splice(at, 1);
-  if (book.활성 === s.id) book.활성 = book.시트[Math.min(at, book.시트.length - 1)].id;
-  const undo: Command[] = [
-    { 종류: "시트더하기", 시트: old[at], 자리: at },
-    ...restoreChanged(book, old),
-  ];
-  return { undo: { 종류: "묶음", 명령: undo }, cells: [], rebuild: true };
-}
-
-function renameSheet(book: Workbook, cmd: Of<"시트이름">): CommandEffect {
-  const s = sheetOf(book, cmd.시트);
-  checkSheetName(book, cmd.이름, s.id);
-  const prev = s.이름;
-  rewriteAll(book, cmd);
-  s.이름 = cmd.이름;
-  return { undo: { 종류: "시트이름", 시트: s.id, 이름: prev }, cells: [], rebuild: true };
-}
-
-function moveSheet(book: Workbook, cmd: Of<"시트옮기기">): CommandEffect {
-  const s = sheetOf(book, cmd.시트);
-  const from = book.시트.indexOf(s);
-  book.시트.splice(from, 1);
-  book.시트.splice(Math.max(0, Math.min(cmd.자리, book.시트.length)), 0, s);
-  return { undo: { 종류: "시트옮기기", 시트: s.id, 자리: from }, cells: [], rebuild: false };
-}
-
-function replaceSheet(book: Workbook, cmd: Of<"시트통째">): CommandEffect {
-  const at = book.시트.findIndex((x) => x.id === cmd.시트.id);
-  if (at < 0) throw new CommandError(`없는 시트: ${cmd.시트.id}`);
-  const prev = book.시트[at];
-  book.시트[at] = clone(cmd.시트);
-  const undo: Of<"시트통째"> = { 종류: "시트통째", 시트: prev };
-  if (cmd.서식) {
-    undo.서식 = book.서식;
-    book.서식 = clone(cmd.서식);
-  }
-  return { undo, cells: [], rebuild: true };
-}
-
 function batch(book: Workbook, cmd: Of<"묶음">): CommandEffect {
   const done: CommandEffect[] = [];
   try {
@@ -644,6 +590,10 @@ export function applyCommand(book: Workbook, command: Command): CommandEffect {
       return moveSheet(book, command);
     case "시트통째":
       return replaceSheet(book, command);
+    case "정렬":
+      return applySort(book, command);
+    case "필터":
+      return applyFilter(book, command);
     case "묶음":
       return batch(book, command);
   }
diff --git a/A00_Common/spreadsheet/spreadsheet_commands_sheet.ts b/A00_Common/spreadsheet/spreadsheet_commands_sheet.ts
new file mode 100644
index 00000000..e4ac3e5d
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_commands_sheet.ts
@@ -0,0 +1,69 @@
+/* =============================================================================
+ * spreadsheet_commands_sheet.ts  (주인 A)
+ * 시트 명령 — 더하기 · 지우기 · 이름 · 옮기기 · 통째 바꿔 넣기. 들머리는 `applyCommand`(commands).
+ * ========================================================================== */
+
+import { clone, CommandError, restoreChanged, rewriteAll, sheetOf } from "./spreadsheet_commands";
+import type { Of } from "./spreadsheet_commands";
+import type { Command, CommandEffect, Workbook } from "./spreadsheet_types";
+
+function checkSheetName(book: Workbook, name: string, self?: string) {
+  if (!name.trim() || name.length > 31) throw new CommandError("시트 이름은 1~31 글자");
+  if (/[[\]:*?/\\]/.test(name) || name.startsWith("'") || name.endsWith("'"))
+    throw new CommandError("시트 이름에 못 쓰는 글자: [ ] : * ? / \\ 와 앞뒤 '");
+  if (book.시트.some((s) => s.id !== self && s.이름.toLowerCase() === name.toLowerCase()))
+    throw new CommandError(`같은 이름 시트가 있음: ${name}`);
+}
+
+export function addSheet(book: Workbook, cmd: Of<"시트더하기">): CommandEffect {
+  if (book.시트.some((s) => s.id === cmd.시트.id))
+    throw new CommandError(`같은 id 시트가 있음: ${cmd.시트.id}`);
+  checkSheetName(book, cmd.시트.이름);
+  book.시트.splice(Math.max(0, Math.min(cmd.자리, book.시트.length)), 0, clone(cmd.시트));
+  return { undo: { 종류: "시트지우기", 시트: cmd.시트.id }, cells: [], rebuild: true };
+}
+
+export function removeSheet(book: Workbook, cmd: Of<"시트지우기">): CommandEffect {
+  const s = sheetOf(book, cmd.시트);
+  if (book.시트.length === 1) throw new CommandError("마지막 시트는 못 지움");
+  const at = book.시트.indexOf(s);
+  const old = book.시트.map(clone);
+  rewriteAll(book, cmd);
+  book.시트.splice(at, 1);
+  if (book.활성 === s.id) book.활성 = book.시트[Math.min(at, book.시트.length - 1)].id;
+  const undo: Command[] = [
+    { 종류: "시트더하기", 시트: old[at], 자리: at },
+    ...restoreChanged(book, old),
+  ];
+  return { undo: { 종류: "묶음", 명령: undo }, cells: [], rebuild: true };
+}
+
+export function renameSheet(book: Workbook, cmd: Of<"시트이름">): CommandEffect {
+  const s = sheetOf(book, cmd.시트);
+  checkSheetName(book, cmd.이름, s.id);
+  const prev = s.이름;
+  rewriteAll(book, cmd);
+  s.이름 = cmd.이름;
+  return { undo: { 종류: "시트이름", 시트: s.id, 이름: prev }, cells: [], rebuild: true };
+}
+
+export function moveSheet(book: Workbook, cmd: Of<"시트옮기기">): CommandEffect {
+  const s = sheetOf(book, cmd.시트);
+  const from = book.시트.indexOf(s);
+  book.시트.splice(from, 1);
+  book.시트.splice(Math.max(0, Math.min(cmd.자리, book.시트.length)), 0, s);
+  return { undo: { 종류: "시트옮기기", 시트: s.id, 자리: from }, cells: [], rebuild: false };
+}
+
+export function replaceSheet(book: Workbook, cmd: Of<"시트통째">): CommandEffect {
+  const at = book.시트.findIndex((x) => x.id === cmd.시트.id);
+  if (at < 0) throw new CommandError(`없는 시트: ${cmd.시트.id}`);
+  const prev = book.시트[at];
+  book.시트[at] = clone(cmd.시트);
+  const undo: Of<"시트통째"> = { 종류: "시트통째", 시트: prev };
+  if (cmd.서식) {
+    undo.서식 = book.서식;
+    book.서식 = clone(cmd.서식);
+  }
+  return { undo, cells: [], rebuild: true };
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_editor.ts b/A00_Common/spreadsheet/spreadsheet_editor.ts
index 08411ba7..ed3b9e90 100644
--- a/A00_Common/spreadsheet/spreadsheet_editor.ts
+++ b/A00_Common/spreadsheet/spreadsheet_editor.ts
@@ -11,6 +11,7 @@
 import { el } from "@ui/ui_template_elements";
 import { moveFormula } from "./spreadsheet_refshift";
 import { colName, parseA1, parseRange, rangeToA1, toA1 } from "./spreadsheet_address";
+import { funcHelp, suggestFunctions, type FuncHelp } from "./spreadsheet_func_help";
 import { tokenize } from "./spreadsheet_parser";
 import { cellsOf, move, selectCell } from "./spreadsheet_selection";
 import type { Cell, CellAddress, CellStyle, Sheet } from "./spreadsheet_types";
@@ -36,6 +37,10 @@ export interface Editor extends EditorHandle {
   point(sel: Selection): void;
   /** 방향키 가리키기 — 지금 가리킨 곳(없으면 편집 칸)에서 */
   pointMove(dr: number, dc: number, extend: boolean, jump: boolean): void;
+  /** 함수 자동 완성 목록이 떠 있으면 고른 이름을 넣음(Tab) */
+  accept(): boolean;
+  /** 자동 완성 목록 안 위아래(목록이 없으면 false) */
+  suggestMove(d: number): boolean;
   /** 고름 칸 전부에 같은 입력(Ctrl+Enter) — 식은 활성 칸 기준 상대 이동 */
   commitAll(): void;
   /** 초점 되찾기(스크롤 없이) */
@@ -140,7 +145,45 @@ function styleAt(ctx: SpreadsheetContext, sheet: Sheet, r: number, c: number): C
   return ctx.book.서식[idx] ?? {};
 }
 
-/** editorSlot 칸 자리 → 층 안 자리 */
+/** 식 글 caret 앞 → 함수 이름 치는 중(prefix) · 함수 인자 안(func · 몇 번째 인자 0 부터) · 아님 null */
+export function formulaHint(
+  pre: string,
+): { prefix: string } | { func: string; arg: number } | null {
+  if (pre[0] !== "=") return null;
+  const m = /(?:^=|[(,+\-*/^&<>:;= ])([A-Za-z][A-Za-z0-9.]*)$/.exec(pre);
+  if (m && !/^\$?[A-Za-z]{1,3}\$?\d+$/.test(m[1])) return { prefix: m[1] };
+  let depth = 0;
+  let arg = 0;
+  let inStr = false;
+  for (let i = pre.length - 1; i > 0; i--) {
+    const ch = pre[i];
+    if (ch === '"') inStr = !inStr;
+    if (inStr) continue;
+    if (ch === ")") depth++;
+    else if (ch === "," && depth === 0) arg++;
+    else if (ch === "(") {
+      if (depth-- > 0) continue;
+      const n = /([A-Za-z][A-Za-z0-9.]*)$/.exec(pre.slice(0, i));
+      return n ? { func: n[1].toUpperCase(), arg } : null;
+    }
+  }
+  return null;
+}
+
+/** 편집기 · 미리보기 자리 — C `editorSlot` 의 box 는 격자 뿌리 기준이라 층(layer)이 뿌리 안에서
+ * 비켜 놓인 만큼 빼서 층 안 좌표로 맞춤. */
+export function slotOf(
+  ctx: SpreadsheetContext,
+  r: number,
+  c: number,
+): { layer: HTMLElement; box: CellBox } {
+  const { layer, box } = ctx.grid.editorSlot(r, c);
+  const a = layer.getBoundingClientRect();
+  const g = ctx.grid.root.getBoundingClientRect();
+  return { layer, box: { ...box, x: box.x - (a.left - g.left), y: box.y - (a.top - g.top) } };
+}
+
+/** 칸 자리 → 층 안 자리 */
 export function boxStyle(node: HTMLElement, box: CellBox): void {
   node.style.left = `${box.x}px`;
   node.style.top = `${box.y}px`;
@@ -178,7 +221,7 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
 
   function place(): void {
     const at = st?.at ?? ctx.selection.활성;
-    const { layer, box } = ctx.grid.editorSlot(at.r, at.c);
+    const { layer, box } = slotOf(ctx, at.r, at.c);
     if (ta.parentElement !== layer) {
       const had = document.activeElement === ta;
       layer.append(ta);
@@ -206,6 +249,56 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
   function highlight(): void {
     const t = st ? text() : "";
     ctx.grid.setRefHighlights(st ? refHighlights(t, st.sheet, sheetId) : []);
+    showHint();
+  }
+
+  // ── 함수 자동 완성 · 인자 도움말 (spreadsheet_func_help · sub1) ────────────────
+  const hint = el("div", { className: "ss-hint", attrs: { hidden: "" } });
+  let sugg: FuncHelp[] = [];
+  let pick = 0;
+  let typed = "";
+
+  function showHint(): void {
+    const node = src();
+    const h = st ? formulaHint(node.value.slice(0, node.selectionEnd)) : null;
+    sugg = h && "prefix" in h ? suggestFunctions(h.prefix).slice(0, 8) : [];
+    typed = h && "prefix" in h ? h.prefix : "";
+    const help = h && "func" in h ? funcHelp(h.func) : null;
+    if (!sugg.length && !help) return void hint.setAttribute("hidden", "");
+    pick = Math.min(pick, Math.max(0, sugg.length - 1));
+    hint.replaceChildren(
+      ...(sugg.length
+        ? sugg.map((f, i) => {
+            const row = el("div", {
+              className: i === pick ? "ss-hint__item is-on" : "ss-hint__item",
+              children: [el("b", { text: f.이름 }), ` ${f.뜻}`],
+            });
+            row.addEventListener("mousedown", (e) => {
+              e.preventDefault();
+              pick = i;
+              accept();
+            });
+            return row;
+          })
+        : [el("div", { className: "ss-hint__help", text: `${help!.꼴} — ${help!.뜻}` })]),
+    );
+    if (hint.parentElement !== ta.parentElement) ta.parentElement?.append(hint);
+    hint.style.left = ta.style.left;
+    hint.style.top = `${parseFloat(ta.style.top || "0") + ta.offsetHeight}px`;
+    hint.removeAttribute("hidden");
+  }
+
+  function accept(): boolean {
+    if (!st || !sugg.length) return false;
+    const node = src();
+    const pos = node.selectionEnd;
+    const name = `${sugg[pick].이름}(`;
+    node.setRangeText(name, pos - typed.length, pos, "end");
+    (node === ta ? formula : ta).value = node.value;
+    pick = 0;
+    place();
+    highlight();
+    return true;
   }
 
   /** 편집 시작 — `value` 없으면 textarea 에 이미 든 글(조합 · 바로 친 글자) 그대로 */
@@ -231,6 +324,7 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
     ta.removeAttribute("style");
     ctx.root.classList.remove("ss--editing");
     ctx.grid.setRefHighlights([]);
+    hint.setAttribute("hidden", "");
     sync();
     focus();
   }
@@ -389,11 +483,19 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
     pointable,
     point,
     pointMove,
+    accept,
+    suggestMove(d: number) {
+      if (!st || !sugg.length) return false;
+      pick = (pick + d + sugg.length) % sugg.length;
+      showHint();
+      return true;
+    },
     focus,
     place() {
       if (st) place();
     },
     destroy() {
+      hint.remove();
       ta.remove();
       bar.remove();
     },
diff --git a/A00_Common/spreadsheet/spreadsheet_extras.ts b/A00_Common/spreadsheet/spreadsheet_extras.ts
new file mode 100644
index 00000000..bcb24ea3
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_extras.ts
@@ -0,0 +1,208 @@
+/* =============================================================================
+ * spreadsheet_extras.ts  (주인 D)
+ * 2단계 부품 잇기(sub1 파일들의 「잇는 법」) — 찾기 패널 · 메모 풍선(마우스 올림) · 메모 편집(Shift+F2) ·
+ * 서식 붓(수식 입력줄 앞 단추 · 두 번 누르면 계속 · Esc 끔) · 골라 붙여넣기(Ctrl+Shift+V → 값만 · 서식만 · 수식만) ·
+ * 도구 모음을 누른 뒤 초점을 격자로 되돌림.
+ * 빨간 세모는 C 격자 · 우클릭 [메모 …] 는 E 메뉴 몫(브레인 배정).
+ * ========================================================================== */
+
+import { el } from "@ui/ui_template_elements";
+import { parseClipboard } from "./spreadsheet_clipboard";
+import { attachComments, getComment, setComment } from "./spreadsheet_comments";
+import type { Editor } from "./spreadsheet_editor";
+import { mountFindPanel } from "./spreadsheet_find_panel";
+import { createFormatPainter } from "./spreadsheet_format_painter";
+import type { KeyHooks } from "./spreadsheet_keys";
+import type { MouseHooks } from "./spreadsheet_mouse";
+import { pasteSpecial, type PasteSpecialMode } from "./spreadsheet_paste_special";
+import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";
+
+const TEXT = {
+  painter: "서식 붓 — 한 번 누르면 한 번 · 두 번 누르면 Esc 까지 계속",
+  pasteTitle: "골라 붙여넣기",
+  modes: { 값: "값만", 서식: "서식만", 수식: "수식만" } as Record<PasteSpecialMode, string>,
+  memo: "메모 — Ctrl+Enter 또는 밖을 누르면 적용 · Esc 취소",
+};
+
+export interface Extras {
+  keys: KeyHooks;
+  mouse: MouseHooks;
+  parts: PartHandle[];
+}
+
+export function attachExtras(
+  ctx: SpreadsheetContext,
+  ed: Editor,
+  toolbarRoot: HTMLElement | null,
+): Extras {
+  const back = (): void => ed.focus();
+  /** 칸 오른쪽 자리(부품 뿌리 기준 px) — C editorSlot box 는 격자 뿌리 기준 */
+  const beside = (r: number, c: number): { x: number; y: number } => {
+    const { box } = ctx.grid.editorSlot(r, c);
+    const g = ctx.grid.root.getBoundingClientRect();
+    const o = ctx.root.getBoundingClientRect();
+    return { x: box.x + box.w + g.left - o.left + 4, y: box.y + g.top - o.top };
+  };
+  const put = (node: HTMLElement, r: number, c: number): void => {
+    const p = beside(r, c);
+    node.style.left = `${p.x}px`;
+    node.style.top = `${p.y}px`;
+  };
+
+  // ── 찾기 ───────────────────────────────────────────────────────────────
+  const find = mountFindPanel(ctx, back);
+
+  // ── 메모 — 풍선 · 편집 ─────────────────────────────────────────────────
+  const comments = attachComments(ctx);
+  let hovered = "";
+  const memo = el("textarea", { className: "ss-memo", attrs: { hidden: "", title: TEXT.memo } });
+  ctx.root.append(memo);
+  let memoAt: { r: number; c: number } | null = null;
+  const closeMemo = (save: boolean): void => {
+    if (!memoAt) return;
+    const at = memoAt;
+    memoAt = null;
+    memo.setAttribute("hidden", "");
+    if (save && memo.value !== (getComment(ctx.sheet(), at.r, at.c) ?? ""))
+      setComment(ctx, at.r, at.c, memo.value.trim());
+    back();
+  };
+  memo.addEventListener("keydown", (e) => {
+    if (e.key === "Escape" || (e.key === "Enter" && e.ctrlKey)) {
+      e.preventDefault();
+      e.stopPropagation();
+      closeMemo(e.key === "Enter");
+    }
+  });
+  memo.addEventListener("blur", () => closeMemo(true));
+
+  function editMemo(): void {
+    if (ctx.readOnly) return;
+    const { r, c } = ctx.selection.활성;
+    memoAt = { r, c };
+    comments.hideBalloon();
+    memo.value = getComment(ctx.sheet(), r, c) ?? "";
+    memo.removeAttribute("hidden");
+    put(memo, r, c);
+    memo.focus();
+  }
+
+  // ── 서식 붓 ─────────────────────────────────────────────────────────────
+  const painter = createFormatPainter(ctx);
+  let sticky = false;
+  const brush = el("button", {
+    className: "ss-brush",
+    text: "붓",
+    attrs: { type: "button", title: TEXT.painter },
+  });
+  const showBrush = (): void => {
+    brush.classList.toggle("is-on", painter.active());
+    ctx.root.classList.toggle("ss--painting", painter.active());
+  };
+  brush.addEventListener("click", (e) => {
+    if (e.detail === 2) sticky = true;
+    else if (painter.active()) (painter.clear(), (sticky = false));
+    else (painter.pick(), (sticky = false));
+    showBrush();
+    back();
+  });
+  if (!ctx.readOnly) ed.bar.prepend(brush);
+
+  // ── 골라 붙여넣기 ─────────────────────────────────────────────────────────
+  let armed = false;
+  const picker = el("div", { className: "ss-pick", attrs: { hidden: "", title: TEXT.pasteTitle } });
+  ctx.root.append(picker);
+  const onPaste = (e: ClipboardEvent): void => {
+    if (!armed || ed.editing()) return;
+    armed = false;
+    e.preventDefault();
+    e.stopPropagation(); // E 클립보드의 보통 붙여넣기를 막음
+    const at = { ...ctx.selection.활성 };
+    const data = e.clipboardData;
+    const block = parseClipboard(
+      data?.getData("text/html") ?? "",
+      data?.getData("text/plain") ?? "",
+      at,
+    );
+    if (!block) return;
+    // ponytail: 우리 복사면 원본을 같은 시트로 봄(ClipBlock 에 시트가 없음) — 값만 때 식 칸 계산값용
+    const source =
+      block.출처 === "aislo" && block.원점
+        ? { 시트: ctx.selection.시트, ...block.원점 }
+        : undefined;
+    picker.replaceChildren(
+      ...(Object.keys(TEXT.modes) as PasteSpecialMode[]).map((mode) => {
+        const b = el("button", {
+          text: TEXT.modes[mode],
+          attrs: { type: "button", "data-mode": mode },
+        });
+        b.addEventListener("click", () => {
+          picker.setAttribute("hidden", "");
+          pasteSpecial(ctx, block, at, mode, source);
+          back();
+        });
+        return b;
+      }),
+    );
+    picker.removeAttribute("hidden");
+    put(picker, at.r, at.c);
+    (picker.firstElementChild as HTMLElement).focus();
+  };
+  picker.addEventListener("keydown", (e) => {
+    if (e.key !== "Escape") return;
+    e.preventDefault();
+    picker.setAttribute("hidden", "");
+    back();
+  });
+  ctx.root.addEventListener("paste", onPaste, true);
+
+  // ── 도구 모음 뒤 초점 ───────────────────────────────────────────────────
+  const onToolbarClick = (e: Event): void => {
+    if ((e.target as HTMLElement).closest("button")) back();
+  };
+  toolbarRoot?.addEventListener("click", onToolbarClick);
+  toolbarRoot?.addEventListener("change", back);
+
+  const self: PartHandle = {
+    root: null,
+    refresh: () => showBrush(),
+    destroy() {
+      ctx.root.removeEventListener("paste", onPaste, true);
+      toolbarRoot?.removeEventListener("click", onToolbarClick);
+      toolbarRoot?.removeEventListener("change", back);
+      memo.remove();
+      picker.remove();
+      brush.remove();
+    },
+  };
+
+  return {
+    keys: {
+      find: (replace) => find.open(replace),
+      pasteSpecial: () => (armed = true),
+      comment: editMemo,
+      escape() {
+        painter.clear();
+        sticky = false;
+        showBrush();
+      },
+    },
+    mouse: {
+      selected() {
+        if (!painter.active()) return;
+        painter.paint(ctx.selection.범위[0], sticky);
+        showBrush();
+      },
+      hover(hit) {
+        const key = hit?.kind === "cell" ? `${hit.r},${hit.c}` : "";
+        if (key === hovered) return;
+        hovered = key;
+        if (!hit || !key || memoAt || !getComment(ctx.sheet(), hit.r, hit.c))
+          return comments.hideBalloon();
+        comments.showBalloon(hit.r, hit.c);
+        put(comments.root!, hit.r, hit.c); // showBalloon 의 cellBox 자리 → 화면 자리로 고침
+      },
+    },
+    parts: [find, comments, self],
+  };
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_filter.ts b/A00_Common/spreadsheet/spreadsheet_filter.ts
new file mode 100644
index 00000000..328267d2
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_filter.ts
@@ -0,0 +1,232 @@
+/* =============================================================================
+ * spreadsheet_filter.ts  (주인 A · 화면)
+ * 자동 필터 — 머리 행 칸마다 ▼ 단추 · 값 목록 창(모두 선택 · 값마다 체크 · 이 열 정렬 · 이 열 필터 지움).
+ * 걸러진 행은 엔진이 `행.걸러짐` 으로 적음(사용자 숨김과 따로) · 명령은 `필터`(spreadsheet_sortfilter.ts).
+ *
+ * 잇는 법(D · sub7 · C · sub6):
+ *   · 부품 붙이기: `const filter = attachFilter(ctx)` — 단추 층을 격자 overlay(editorSlot 층)에 얹음.
+ *     grid.render() 뒤마다 `filter.refresh()`(단추 자리 · 켜짐 표시) · 스크롤은 스스로 따라감.
+ *   · 도구 단추 「필터」 · Ctrl+Shift+L → `toggleFilter(ctx)`(켜기 = 고른 범위 · 칸 하나면 현재 영역 / 끄기).
+ *   · Alt+↓(활성 칸이 머리 행이면) → `filter.open(활성 열)`.
+ *   · 격자(C): 행 `걸러짐` 을 `숨김` 처럼 높이 0 으로 — 머리의 숨김 표시(두 줄)는 사용자 `숨김` 만.
+ * ========================================================================== */
+
+import { createButton, el, showToast } from "@ui/ui_template_elements";
+import { currentLanguageIndex } from "@ui/ui_template_locale";
+import { colName, parseRange, rangeToA1 } from "./spreadsheet_address";
+import { CommandError } from "./spreadsheet_commands";
+import { currentRegion, filterCommand, filterItems, sortCommand } from "./spreadsheet_sortfilter";
+import type { AutoFilter, Command } from "./spreadsheet_types";
+import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";
+import "./spreadsheet_sortfilter.css";
+
+const TEXT = {
+  Button: ["필터", "Filter"],
+  All: ["(모두 선택)", "(Select all)"],
+  Blank: ["(빈 칸)", "(Blanks)"],
+  SortAsc: ["오름차순 정렬", "Sort ascending"],
+  SortDesc: ["내림차순 정렬", "Sort descending"],
+  Clear: ["이 열 필터 지우기", "Clear filter from column"],
+  Ok: ["확인", "OK"],
+  Cancel: ["취소", "Cancel"],
+};
+const t = (key: keyof typeof TEXT) => TEXT[key][currentLanguageIndex] ?? TEXT[key][0];
+
+function send(ctx: SpreadsheetContext, make: () => Command): void {
+  try {
+    ctx.dispatch(make());
+  } catch (e) {
+    if (!(e instanceof CommandError)) throw e;
+    showToast(e.message, "error");
+  }
+}
+
+/** 필터 켜기 · 끄기 */
+export function toggleFilter(ctx: SpreadsheetContext): void {
+  if (ctx.readOnly) return;
+  const s = ctx.sheet();
+  if (s.필터) return send(ctx, () => filterCommand(ctx.book, ctx.engine, s.id, null));
+  const g = ctx.selection.범위[0];
+  const rg = g.r0 === g.r1 && g.c0 === g.c1 ? currentRegion(ctx.book, s.id, g.r0, g.c0) : g;
+  send(ctx, () => ({ 종류: "필터", 시트: s.id, 필터: { 범위: rangeToA1(rg) }, 걸러짐: [] }));
+}
+
+export interface FilterHandle extends PartHandle {
+  /** 열 `c` 값 목록 창 열기(필터 범위 안일 때) */
+  open(c: number): void;
+}
+
+export function attachFilter(ctx: SpreadsheetContext): FilterHandle {
+  const layer = el("div", { className: "ss-filter__layer" });
+  let panel: HTMLElement | null = null;
+
+  const filterOf = () => {
+    const f = ctx.sheet().필터;
+    const rg = f && parseRange(f.범위);
+    return f && rg ? { f, rg } : null;
+  };
+
+  /** 칸 자리 → 단추 층 안 자리(editorSlot 상자는 격자 뿌리 기준 — 층 원점과 다를 수 있어 실제 자리로 맞춤) */
+  function boxIn(r: number, c: number) {
+    const { layer: host, box } = ctx.grid.editorSlot(r, c);
+    const a = host.getBoundingClientRect();
+    const g = ctx.grid.root.getBoundingClientRect();
+    return { ...box, x: box.x - (a.left - g.left), y: box.y - (a.top - g.top) };
+  }
+
+  /** 머리 칸이 지금 보이나(틀고정 판이면 늘 보임) */
+  function shown(r: number, c: number): boolean {
+    const v = ctx.grid.visibleRange();
+    const fz = ctx.sheet().틀고정 ?? {};
+    const rowOk = r < (fz.행 ?? 0) || (r >= v.r0 && r <= v.r1);
+    const colOk = c < (fz.열 ?? 0) || (c >= v.c0 && c <= v.c1);
+    return rowOk && colOk;
+  }
+
+  function place(): void {
+    const { layer: host } = ctx.grid.editorSlot(0, 0);
+    if (layer.parentElement !== host) host.append(layer);
+    const cur = filterOf();
+    const btns: HTMLElement[] = [];
+    if (cur)
+      for (let c = cur.rg.c0; c <= cur.rg.c1; c++) {
+        const box = boxIn(cur.rg.r0, c);
+        if (!box.w || !box.h || !shown(cur.rg.r0, c)) continue;
+        const on = !!cur.f.조건?.[colName(c)];
+        const b = el("button", {
+          className: on ? "ss-filter__btn is-on" : "ss-filter__btn",
+          text: "▼",
+          attrs: {
+            type: "button",
+            "aria-label": `${t("Button")} ${colName(c)}`,
+            "data-col": String(c),
+          },
+        });
+        b.style.left = `${box.x + box.w - 17}px`;
+        b.style.top = `${box.y + box.h - 17}px`;
+        b.addEventListener("mousedown", (ev) => ev.stopPropagation());
+        b.addEventListener("click", () => open(c));
+        btns.push(b);
+      }
+    layer.replaceChildren(...btns, ...(panel ? [panel] : []));
+  }
+
+  function close(): void {
+    panel?.remove();
+    panel = null;
+    document.removeEventListener("mousedown", onOutside, true);
+  }
+
+  const onOutside = (ev: MouseEvent) => {
+    if (panel && !panel.contains(ev.target as Node)) close();
+  };
+
+  function apply(next: AutoFilter): void {
+    close();
+    send(ctx, () => filterCommand(ctx.book, ctx.engine, ctx.sheet().id, next));
+  }
+
+  function open(c: number): void {
+    const cur = filterOf();
+    if (!cur || c < cur.rg.c0 || c > cur.rg.c1 || ctx.readOnly) return;
+    close();
+    const sheetId = ctx.sheet().id;
+    const items = filterItems(ctx.book, ctx.engine, sheetId, c);
+    const boxes = items.map((it) => {
+      const cb = el("input", { attrs: { type: "checkbox" } });
+      cb.checked = it.켬;
+      return cb;
+    });
+    const all = el("input", { attrs: { type: "checkbox" } });
+    const ok = createButton({
+      label: t("Ok"),
+      onClick: () => {
+        const conds = { ...cur.f.조건 };
+        if (boxes.every((b) => b.checked)) delete conds[colName(c)];
+        else conds[colName(c)] = items.filter((_, i) => boxes[i].checked).map((it) => it.글);
+        apply({ ...cur.f, 조건: conds });
+      },
+    });
+    const sync = () => {
+      all.checked = boxes.every((b) => b.checked);
+      all.indeterminate = !all.checked && boxes.some((b) => b.checked);
+      ok.disabled = !boxes.some((b) => b.checked);
+    };
+    all.addEventListener("change", () => {
+      for (const b of boxes) b.checked = all.checked;
+      sync();
+    });
+    for (const b of boxes) b.addEventListener("change", sync);
+    const link = (label: string, run: () => void) => {
+      const a = el("button", {
+        className: "ss-filter__link",
+        text: label,
+        attrs: { type: "button" },
+      });
+      a.addEventListener("click", run);
+      return a;
+    };
+    const sortBy = (desc: boolean) => () => {
+      close();
+      send(ctx, () =>
+        sortCommand(ctx.book, ctx.engine, sheetId, cur.rg, {
+          머리: true,
+          기준: [{ 열: c, 내림: desc }],
+        }),
+      );
+    };
+    const rest = { ...cur.f.조건 };
+    delete rest[colName(c)];
+
+    panel = el("div", {
+      className: "ss-filter__panel",
+      attrs: { role: "dialog", "aria-label": `${t("Button")} ${colName(c)}` },
+      children: [
+        link(t("SortAsc"), sortBy(false)),
+        link(t("SortDesc"), sortBy(true)),
+        link(t("Clear"), () => apply({ ...cur.f, 조건: rest })),
+        el("div", {
+          className: "ss-filter__list",
+          children: [
+            el("label", { children: [all, t("All")] }),
+            ...items.map((it, i) =>
+              el("label", { children: [boxes[i], it.글 === "" ? t("Blank") : it.글] }),
+            ),
+          ],
+        }),
+        el("div", {
+          className: "ss-filter__foot",
+          children: [createButton({ label: t("Cancel"), variant: "ghost", onClick: close }), ok],
+        }),
+      ],
+    });
+    panel.addEventListener("keydown", (ev) => {
+      if (ev.key === "Escape") close();
+      ev.stopPropagation();
+    });
+    const box = boxIn(cur.rg.r0, c);
+    panel.style.left = `${box.x}px`;
+    panel.style.top = `${box.y + box.h}px`;
+    sync();
+    layer.append(panel);
+    document.addEventListener("mousedown", onOutside, true);
+  }
+
+  const onScroll = () => place();
+  ctx.grid.root.addEventListener("scroll", onScroll, true);
+  place();
+
+  return {
+    root: layer,
+    refresh() {
+      close();
+      place();
+    },
+    open,
+    destroy() {
+      close();
+      ctx.grid.root.removeEventListener("scroll", onScroll, true);
+      layer.remove();
+    },
+  };
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_find_panel.ts b/A00_Common/spreadsheet/spreadsheet_find_panel.ts
new file mode 100644
index 00000000..985ffd1b
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_find_panel.ts
@@ -0,0 +1,131 @@
+/* =============================================================================
+ * spreadsheet_find_panel.ts  (주인 D)
+ * 찾기(Ctrl+F) · 바꾸기(Ctrl+H) 작은 패널 — 부품 오른위에 뜸. 찾기 규칙은 `spreadsheet_find.ts`(sub1).
+ * Enter = 다음 · Esc = 닫고 격자로. 바꾸기 = 활성 칸이 맞으면 바꾸고 다음으로(엑셀).
+ * ========================================================================== */
+
+import { el } from "@ui/ui_template_elements";
+import { findAll, findNext, replaceAll, replaceOne, type FindOptions } from "./spreadsheet_find";
+import { selectCell } from "./spreadsheet_selection";
+import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";
+
+const TEXT = {
+  find: "찾을 내용",
+  replace: "바꿀 내용",
+  next: "다음",
+  one: "바꾸기",
+  all: "모두 바꾸기",
+  close: "닫기",
+  case: "대소문자",
+  whole: "전체 칸",
+  formula: "수식 안",
+  none: "찾을 수 없음",
+  replaced: "{n} 개 바꿈",
+};
+
+export interface FindPanelHandle extends PartHandle {
+  open(replace: boolean): void;
+  close(): void;
+}
+
+export function mountFindPanel(ctx: SpreadsheetContext, back: () => void): FindPanelHandle {
+  const query = el("input", { className: "ss-find__input", attrs: { placeholder: TEXT.find } });
+  const repl = el("input", { className: "ss-find__input", attrs: { placeholder: TEXT.replace } });
+  const status = el("span", { className: "ss-find__status" });
+  const button = (text: string, onClick: () => void): HTMLButtonElement => {
+    const b = el("button", { className: "ss-find__btn", text, attrs: { type: "button" } });
+    b.addEventListener("click", onClick);
+    return b;
+  };
+  const check = (text: string): HTMLInputElement => {
+    const box = el("input", { attrs: { type: "checkbox" } });
+    options.append(el("label", { className: "ss-find__opt", children: [box, text] }));
+    return box;
+  };
+  const closeBtn = button("×", close);
+  closeBtn.title = TEXT.close;
+  const options = el("div", { className: "ss-find__row" });
+  const caseBox = check(TEXT.case);
+  const wholeBox = check(TEXT.whole);
+  const formulaBox = check(TEXT.formula);
+  const replaceRow = el("div", {
+    className: "ss-find__row",
+    children: [repl, button(TEXT.one, one), button(TEXT.all, all)],
+  });
+  const root = el("div", {
+    className: "ss-find",
+    attrs: { hidden: "" },
+    children: [
+      el("div", {
+        className: "ss-find__row",
+        children: [query, button(TEXT.next, next), closeBtn],
+      }),
+      replaceRow,
+      options,
+      status,
+    ],
+  });
+  ctx.root.append(root);
+
+  const opts = (): FindOptions => ({
+    대소문자: caseBox.checked,
+    전체칸: wholeBox.checked,
+    수식안: formulaBox.checked,
+  });
+  const here = () => ({ 시트: ctx.selection.시트, ...ctx.selection.활성 });
+
+  function next(): void {
+    status.textContent = "";
+    if (!query.value) return;
+    const hit = findNext(ctx.book, here(), query.value, opts());
+    if (!hit) return void (status.textContent = TEXT.none);
+    if (hit.시트 !== ctx.selection.시트) ctx.showSheet(hit.시트);
+    ctx.select(selectCell(ctx.sheet(), hit.r, hit.c), true);
+  }
+
+  function one(): void {
+    if (ctx.readOnly || !query.value) return;
+    const at = here();
+    const onIt = findAll(ctx.book, query.value, opts(), [at.시트]).some(
+      (h) => h.r === at.r && h.c === at.c,
+    );
+    if (onIt) replaceOne(ctx, at, query.value, repl.value, opts());
+    next();
+  }
+
+  function all(): void {
+    if (ctx.readOnly || !query.value) return;
+    const n = replaceAll(ctx, query.value, repl.value, opts());
+    status.textContent = n ? TEXT.replaced.replace("{n}", String(n)) : TEXT.none;
+  }
+
+  function open(replace: boolean): void {
+    replaceRow.hidden = !replace || ctx.readOnly;
+    root.removeAttribute("hidden");
+    status.textContent = "";
+    query.focus();
+    query.select();
+  }
+
+  function close(): void {
+    root.setAttribute("hidden", "");
+    back();
+  }
+
+  const onKey = (e: KeyboardEvent): void => {
+    if (e.key === "Escape") close();
+    else if (e.key === "Enter") e.target === repl ? one() : next();
+    else return;
+    e.preventDefault();
+    e.stopPropagation();
+  };
+  root.addEventListener("keydown", onKey);
+
+  return {
+    root,
+    open,
+    close,
+    refresh() {},
+    destroy: () => root.remove(),
+  };
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_functions.ts b/A00_Common/spreadsheet/spreadsheet_functions.ts
index d0cabc22..a92ef894 100644
--- a/A00_Common/spreadsheet/spreadsheet_functions.ts
+++ b/A00_Common/spreadsheet/spreadsheet_functions.ts
@@ -1,18 +1,21 @@
 /* =============================================================================
  * spreadsheet_functions.ts  (주인 B)
- * 함수 표 — 이름(대문자) → 뜻. 몸은 `spreadsheet_functions_math.ts` · `_misc.ts` 에 두고 여기서 모음.
- * 1단계 약 45 — 수학 SUM PRODUCT SUMPRODUCT ROUND ROUNDUP ROUNDDOWN INT TRUNC CEILING FLOOR ABS MOD
- *   POWER SQRT PI SIN COS TAN ASIN ACOS ATAN RADIANS DEGREES MIN MAX AVERAGE · 논리 IF AND OR NOT IFERROR ·
- *   글 CONCATENATE FIXED TEXT LEN LEFT RIGHT MID VALUE · 찾기 VLOOKUP HLOOKUP INDEX MATCH CHOOSE ·
- *   세기 COUNT COUNTA COUNTIF SUMIF. 뜻 · 경계값은 엑셀과 같게(Formula.js 는 시험 대조 답으로만).
+ * 함수 표 — 이름(대문자) → 뜻. 몸은 `spreadsheet_functions_math.ts` · `_misc.ts` · `_lookup.ts` 에
+ * 두고 여기서 모음. 1단계 약 45 + 2단계 첫 묶음(2026-09-27) — 아래 `FUNC_HELP_BATCH2`(sub1 의
+ * `spreadsheet_func_help.ts` 가 읽어 이름 목록에 더할 것 — 그 파일은 sub1 몫이라 안 고침).
  * 없는 이름 = `#NAME?` · 인자 수가 min · max 밖이면 A 의 eval 이 `#VALUE!` + 까닭(엑셀은 입력을 막음).
  * ========================================================================== */
 
 import type { SheetFunction } from "./spreadsheet_types";
 import { MATH_FUNCTIONS } from "./spreadsheet_functions_math";
 import { MISC_FUNCTIONS } from "./spreadsheet_functions_misc";
+import { LOOKUP_FUNCTIONS } from "./spreadsheet_functions_lookup";
 
-const TABLE: Record<string, SheetFunction> = { ...MATH_FUNCTIONS, ...MISC_FUNCTIONS };
+const TABLE: Record<string, SheetFunction> = {
+  ...MATH_FUNCTIONS,
+  ...MISC_FUNCTIONS,
+  ...LOOKUP_FUNCTIONS,
+};
 
 export function getFunction(name: string): SheetFunction | undefined {
   return TABLE[name.toUpperCase()];
@@ -22,3 +25,97 @@ export function getFunction(name: string): SheetFunction | undefined {
 export function functionNames(): string[] {
   return Object.keys(TABLE).sort();
 }
+
+/** 2단계 첫 묶음(2026-09-27) — sub1 `spreadsheet_func_help.ts` 의 `TABLE` 에 이 모양대로 더할 것.
+ * `이름` · `꼴`(인자 모양 · 대괄호 = 생략 가능) · `뜻`(한 줄). */
+export interface FuncHelpEntry {
+  이름: string;
+  꼴: string;
+  뜻: string;
+}
+
+export const FUNC_HELP_BATCH2: FuncHelpEntry[] = [
+  { 이름: "MROUND", 꼴: "MROUND(수, 배수)", 뜻: "배수의 가장 가까운 정수 배로 반올림" },
+  { 이름: "ODD", 꼴: "ODD(수)", 뜻: "홀수로 올림(0 에서 먼 쪽)" },
+  { 이름: "EVEN", 꼴: "EVEN(수)", 뜻: "짝수로 올림(0 에서 먼 쪽)" },
+  { 이름: "LOG", 꼴: "LOG(수, [밑=10])", 뜻: "로그(밑 지정)" },
+  { 이름: "LOG10", 꼴: "LOG10(수)", 뜻: "상용로그" },
+  { 이름: "LN", 꼴: "LN(수)", 뜻: "자연로그" },
+  { 이름: "EXP", 꼴: "EXP(수)", 뜻: "e 의 거듭제곱" },
+  {
+    이름: "SUMIFS",
+    꼴: "SUMIFS(합할범위, 조건범위1, 조건1, [조건범위2, 조건2], …)",
+    뜻: "여러 조건에 다 맞는 칸의 합",
+  },
+  {
+    이름: "COUNTIFS",
+    꼴: "COUNTIFS(조건범위1, 조건1, [조건범위2, 조건2], …)",
+    뜻: "여러 조건에 다 맞는 칸 개수",
+  },
+  {
+    이름: "AVERAGEIF",
+    꼴: "AVERAGEIF(범위, 조건, [평균범위])",
+    뜻: "조건에 맞는 칸(또는 짝 칸)의 평균",
+  },
+  {
+    이름: "AVERAGEIFS",
+    꼴: "AVERAGEIFS(평균범위, 조건범위1, 조건1, …)",
+    뜻: "여러 조건에 다 맞는 칸의 평균",
+  },
+  {
+    이름: "MAXIFS",
+    꼴: "MAXIFS(최대범위, 조건범위1, 조건1, …)",
+    뜻: "여러 조건에 다 맞는 칸의 최댓값",
+  },
+  {
+    이름: "MINIFS",
+    꼴: "MINIFS(최소범위, 조건범위1, 조건1, …)",
+    뜻: "여러 조건에 다 맞는 칸의 최솟값",
+  },
+  {
+    이름: "IFS",
+    꼴: "IFS(조건1, 값1, [조건2, 값2], …)",
+    뜻: "처음으로 참인 조건의 값",
+  },
+  {
+    이름: "SWITCH",
+    꼴: "SWITCH(식, 값1, 결과1, [값2, 결과2], …, [기본값])",
+    뜻: "식과 같은 값을 찾아 그 결과",
+  },
+  {
+    이름: "XLOOKUP",
+    꼴: "XLOOKUP(찾을값, 찾을범위, 돌려줄범위, [못찾으면], [맞춤꼴], [찾는방향])",
+    뜻: "찾을범위에서 찾아 돌려줄범위의 같은 자리 값",
+  },
+  {
+    이름: "TEXTJOIN",
+    꼴: "TEXTJOIN(구분자, 빈칸건너뜀, 글1, [글2], …)",
+    뜻: "구분자로 여러 글을 이어 붙임",
+  },
+  { 이름: "TRIM", 꼴: "TRIM(글)", 뜻: "앞뒤 · 겹친 빈칸을 뺌" },
+  { 이름: "UPPER", 꼴: "UPPER(글)", 뜻: "대문자로" },
+  { 이름: "LOWER", 꼴: "LOWER(글)", 뜻: "소문자로" },
+  {
+    이름: "SUBSTITUTE",
+    꼴: "SUBSTITUTE(글, 옛글, 새글, [몇번째])",
+    뜻: "글 안 옛글을 새글로 바꿈",
+  },
+  { 이름: "REPLACE", 꼴: "REPLACE(글, 시작, 글자수, 새글)", 뜻: "자리로 콕 집어 바꿈" },
+  { 이름: "FIND", 꼴: "FIND(찾을글, 안글, [시작])", 뜻: "글자 그대로 찾음(대소문자 가림)" },
+  {
+    이름: "SEARCH",
+    꼴: "SEARCH(찾을글, 안글, [시작])",
+    뜻: "찾음(대소문자 안 가림 · * ? 자리표시)",
+  },
+  { 이름: "REPT", 꼴: "REPT(글, 번)", 뜻: "글을 번 만큼 되풀이" },
+  { 이름: "ISNUMBER", 꼴: "ISNUMBER(값)", 뜻: "수면 참" },
+  { 이름: "ISTEXT", 꼴: "ISTEXT(값)", 뜻: "글이면 참" },
+  { 이름: "ISBLANK", 꼴: "ISBLANK(값)", 뜻: "빈 칸이면 참" },
+  { 이름: "ISERROR", 꼴: "ISERROR(값)", 뜻: "오류 값이면 참" },
+  { 이름: "NA", 꼴: "NA()", 뜻: "#N/A 오류를 만듦" },
+  { 이름: "TODAY", 꼴: "TODAY()", 뜻: "오늘 날짜(일련번호)" },
+  { 이름: "DATE", 꼴: "DATE(년, 월, 일)", 뜻: "날짜 일련번호를 만듦" },
+  { 이름: "YEAR", 꼴: "YEAR(일련번호)", 뜻: "연도" },
+  { 이름: "MONTH", 꼴: "MONTH(일련번호)", 뜻: "월" },
+  { 이름: "DAY", 꼴: "DAY(일련번호)", 뜻: "일" },
+];
diff --git a/A00_Common/spreadsheet/spreadsheet_functions_lookup.ts b/A00_Common/spreadsheet/spreadsheet_functions_lookup.ts
new file mode 100644
index 00000000..214caa5f
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_functions_lookup.ts
@@ -0,0 +1,536 @@
+/* =============================================================================
+ * spreadsheet_functions_lookup.ts  (주인 B · misc 700 줄 넘어 2026-09-27 쪼갬)
+ * 찾기 · 조건부 세기·합·평균·최대·최소 함수. `spreadsheet_functions_misc.ts` 에서
+ * VLOOKUP · HLOOKUP · INDEX · MATCH · CHOOSE · COUNT · COUNTA · COUNTIF · SUMIF ·
+ * SUMIFS · COUNTIFS · AVERAGEIF(S) · MAXIFS · MINIFS · IFS · SWITCH · XLOOKUP 를 옮겨 옴.
+ * 형 바꾸기 도우미는 `spreadsheet_functions_math.ts` 공용 것을 씀.
+ * ========================================================================== */
+
+import {
+  ZERO,
+  add,
+  cmp,
+  div,
+  frac,
+  parseDecimal,
+  type Frac,
+} from "@ui/sheet/ui_template_sheet_frac";
+import type { ErrorValue, LazyArg, RangeValue, Scalar, SheetFunction } from "./spreadsheet_types";
+import {
+  bool,
+  collectNumbers,
+  fracToDouble,
+  isErr,
+  isFrac,
+  isRange,
+  mkErr,
+  num,
+  toNumber,
+  toScalar,
+} from "./spreadsheet_functions_math";
+
+const ONE = frac(1n);
+
+// ── 값 견줌(찾기 · 세기 함수 공용) ───────────────────────────────────────────
+
+function typeRank(v: Scalar): number {
+  if (v === null) return -1;
+  if (isFrac(v)) return 0;
+  if (typeof v === "string") return 1;
+  if (typeof v === "boolean") return 2;
+  return 3;
+}
+
+function compareScalars(a: Scalar, b: Scalar): number {
+  if (isFrac(a) && isFrac(b)) return cmp(a, b);
+  if (typeof a === "string" && typeof b === "string") {
+    const la = a.toUpperCase();
+    const lb = b.toUpperCase();
+    return la < lb ? -1 : la > lb ? 1 : 0;
+  }
+  if (typeof a === "boolean" && typeof b === "boolean") return a === b ? 0 : a ? 1 : -1;
+  return 0;
+}
+
+function equalScalars(a: Scalar, b: Scalar): boolean {
+  return typeRank(a) === typeRank(b) && compareScalars(a, b) === 0;
+}
+
+function wrapScalar(v: Scalar): RangeValue {
+  return { kind: "range", rows: 1, cols: 1, at: () => v };
+}
+
+// ── 조건 글(`>10` · `<=5` · `사과*`) ─────────────────────────────────────────
+
+function wildcardToRegex(text: string): RegExp {
+  const escaped = text
+    .replace(/[.+^${}()|[\]\\]/g, "\\$&")
+    .replace(/\*/g, ".*")
+    .replace(/\?/g, ".");
+  return new RegExp(`^${escaped}$`, "i");
+}
+
+function parseCriteria(crit: Scalar): (cell: Scalar) => boolean {
+  if (crit === null) return (cell) => cell === null;
+  if (typeof crit === "boolean") return (cell) => typeof cell === "boolean" && cell === crit;
+  if (isFrac(crit)) return (cell) => isFrac(cell) && cmp(cell, crit) === 0;
+  if (isErr(crit)) return () => false;
+  const m = /^(<=|>=|<>|<|>|=)?(.*)$/.exec(crit);
+  const op = m?.[1] ?? "";
+  const rest = m?.[2] ?? crit;
+  let numRest: Frac | null = null;
+  try {
+    numRest = rest.trim() === "" ? null : parseDecimal(rest);
+  } catch {
+    numRest = null;
+  }
+  if (numRest !== null) {
+    const nr = numRest;
+    return (cell) => {
+      if (!isFrac(cell)) return false;
+      const c = cmp(cell, nr);
+      if (op === "<=") return c <= 0;
+      if (op === ">=") return c >= 0;
+      if (op === "<>") return c !== 0;
+      if (op === "<") return c < 0;
+      if (op === ">") return c > 0;
+      return c === 0;
+    };
+  }
+  const pat = wildcardToRegex(rest);
+  if (op === "<>") return (cell) => !(typeof cell === "string" && pat.test(cell));
+  return (cell) => typeof cell === "string" && pat.test(cell);
+}
+
+/** `args[from]` 부터 (범위,조건) 짝을 이어가며 모두 맞는 자리만 참 — *IFS 함수 공용.
+ * `shape` 범위와 크기가 다른 조건 범위가 있으면 `#VALUE!`. */
+function criteriaMask(args: LazyArg[], from: number, shape: RangeValue): boolean[] | ErrorValue {
+  const mask = new Array<boolean>(shape.rows * shape.cols).fill(true);
+  for (let i = from; i + 1 < args.length; i += 2) {
+    const rangeArg = args[i]();
+    if (!isRange(rangeArg)) return mkErr("#VALUE!");
+    if (rangeArg.rows !== shape.rows || rangeArg.cols !== shape.cols) {
+      return mkErr("#VALUE!", "조건 범위 크기가 다름");
+    }
+    const crit = toScalar(args[i + 1]());
+    if (isErr(crit)) return crit;
+    const pred = parseCriteria(crit);
+    let k = 0;
+    for (let r = 0; r < shape.rows; r++) {
+      for (let c = 0; c < shape.cols; c++) {
+        if (mask[k] && !pred(rangeArg.at(r, c))) mask[k] = false;
+        k++;
+      }
+    }
+  }
+  return mask;
+}
+
+// ── 함수 표 ──────────────────────────────────────────────────────────────
+
+export const LOOKUP_FUNCTIONS: Record<string, SheetFunction> = {
+  VLOOKUP: {
+    min: 3,
+    max: 4,
+    call: (args) => {
+      const lookup = toScalar(args[0]());
+      if (isErr(lookup)) return lookup;
+      const table = args[1]();
+      if (!isRange(table)) return mkErr("#VALUE!");
+      const colN = num(args[2]());
+      if (isErr(colN)) return colN;
+      const col = Math.trunc(fracToDouble(colN)) - 1;
+      if (col < 0 || col >= table.cols) return mkErr("#REF!");
+      const approxRaw = args.length > 3 ? bool(args[3]()) : true;
+      if (isErr(approxRaw)) return approxRaw;
+      if (approxRaw) {
+        let best = -1;
+        for (let r = 0; r < table.rows; r++) {
+          const key = table.at(r, 0);
+          if (typeRank(key) !== typeRank(lookup)) {
+            if (best >= 0) break;
+            continue;
+          }
+          if (compareScalars(key, lookup) <= 0) best = r;
+          else break;
+        }
+        if (best < 0) return mkErr("#N/A");
+        return table.at(best, col);
+      }
+      for (let r = 0; r < table.rows; r++) {
+        if (equalScalars(table.at(r, 0), lookup)) return table.at(r, col);
+      }
+      return mkErr("#N/A");
+    },
+  },
+  HLOOKUP: {
+    min: 3,
+    max: 4,
+    call: (args) => {
+      const lookup = toScalar(args[0]());
+      if (isErr(lookup)) return lookup;
+      const table = args[1]();
+      if (!isRange(table)) return mkErr("#VALUE!");
+      const rowN = num(args[2]());
+      if (isErr(rowN)) return rowN;
+      const row = Math.trunc(fracToDouble(rowN)) - 1;
+      if (row < 0 || row >= table.rows) return mkErr("#REF!");
+      const approxRaw = args.length > 3 ? bool(args[3]()) : true;
+      if (isErr(approxRaw)) return approxRaw;
+      if (approxRaw) {
+        let best = -1;
+        for (let c = 0; c < table.cols; c++) {
+          const key = table.at(0, c);
+          if (typeRank(key) !== typeRank(lookup)) {
+            if (best >= 0) break;
+            continue;
+          }
+          if (compareScalars(key, lookup) <= 0) best = c;
+          else break;
+        }
+        if (best < 0) return mkErr("#N/A");
+        return table.at(row, best);
+      }
+      for (let c = 0; c < table.cols; c++) {
+        if (equalScalars(table.at(0, c), lookup)) return table.at(row, c);
+      }
+      return mkErr("#N/A");
+    },
+  },
+  INDEX: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const rangeArg = args[0]();
+      if (isErr(rangeArg)) return rangeArg;
+      const range = isRange(rangeArg) ? rangeArg : wrapScalar(rangeArg);
+      const rowN = num(args[1]());
+      if (isErr(rowN)) return rowN;
+      const row = Math.trunc(fracToDouble(rowN));
+      const colN = args.length > 2 ? num(args[2]()) : frac(range.cols === 1 ? 1n : 0n);
+      if (isErr(colN)) return colN;
+      const col = Math.trunc(fracToDouble(colN));
+      if (row === 0 && col === 0) return mkErr("#VALUE!");
+      if (row === 0) {
+        if (col < 1 || col > range.cols) return mkErr("#REF!");
+        const c = col - 1;
+        return { kind: "range", rows: range.rows, cols: 1, at: (r: number) => range.at(r, c) };
+      }
+      if (col === 0) {
+        if (row < 1 || row > range.rows) return mkErr("#REF!");
+        const r = row - 1;
+        return {
+          kind: "range",
+          rows: 1,
+          cols: range.cols,
+          at: (_r: number, c: number) => range.at(r, c),
+        };
+      }
+      if (row < 1 || row > range.rows || col < 1 || col > range.cols) return mkErr("#REF!");
+      return range.at(row - 1, col - 1);
+    },
+  },
+  MATCH: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const lookup = toScalar(args[0]());
+      if (isErr(lookup)) return lookup;
+      const rangeArg = args[1]();
+      if (!isRange(rangeArg)) return mkErr("#VALUE!");
+      if (rangeArg.rows !== 1 && rangeArg.cols !== 1) {
+        return mkErr("#VALUE!", "한 줄 · 한 칸짜리 범위만");
+      }
+      const n = rangeArg.rows === 1 ? rangeArg.cols : rangeArg.rows;
+      const at = (i: number): Scalar =>
+        rangeArg.rows === 1 ? rangeArg.at(0, i) : rangeArg.at(i, 0);
+      const modeN = args.length > 2 ? num(args[2]()) : ONE;
+      if (isErr(modeN)) return modeN;
+      const mode = Math.trunc(fracToDouble(modeN));
+      if (mode === 0) {
+        for (let i = 0; i < n; i++) if (equalScalars(at(i), lookup)) return frac(BigInt(i + 1));
+        return mkErr("#N/A");
+      }
+      let best = -1;
+      for (let i = 0; i < n; i++) {
+        const key = at(i);
+        if (typeRank(key) !== typeRank(lookup)) {
+          if (best >= 0) break;
+          continue;
+        }
+        const c = compareScalars(key, lookup);
+        if (mode > 0 ? c <= 0 : c >= 0) best = i;
+        else break;
+      }
+      if (best < 0) return mkErr("#N/A");
+      return frac(BigInt(best + 1));
+    },
+  },
+  CHOOSE: {
+    min: 2,
+    call: (args) => {
+      const idxN = num(args[0]());
+      if (isErr(idxN)) return idxN;
+      const idx = Math.trunc(fracToDouble(idxN));
+      if (idx < 1 || idx > args.length - 1) return mkErr("#VALUE!");
+      return args[idx]();
+    },
+  },
+  COUNT: {
+    min: 0,
+    call: (args) => {
+      const values = collectNumbers(args, false, false);
+      return isErr(values) ? values : frac(BigInt(values.length));
+    },
+  },
+  COUNTA: {
+    min: 0,
+    call: (args) => {
+      let count = 0;
+      for (const a of args) {
+        const v = a();
+        if (isRange(v)) {
+          for (let r = 0; r < v.rows; r++) {
+            for (let c = 0; c < v.cols; c++) if (v.at(r, c) !== null) count++;
+          }
+        } else if (v !== null) {
+          count++;
+        }
+      }
+      return frac(BigInt(count));
+    },
+  },
+  COUNTIF: {
+    min: 2,
+    max: 2,
+    call: (args) => {
+      const range = args[0]();
+      if (!isRange(range)) return mkErr("#VALUE!");
+      const crit = toScalar(args[1]());
+      if (isErr(crit)) return crit;
+      const pred = parseCriteria(crit);
+      let count = 0;
+      for (let r = 0; r < range.rows; r++) {
+        for (let c = 0; c < range.cols; c++) if (pred(range.at(r, c))) count++;
+      }
+      return frac(BigInt(count));
+    },
+  },
+  SUMIF: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const range = args[0]();
+      if (!isRange(range)) return mkErr("#VALUE!");
+      const crit = toScalar(args[1]());
+      if (isErr(crit)) return crit;
+      const pred = parseCriteria(crit);
+      const sumRange = args.length > 2 ? args[2]() : range;
+      if (!isRange(sumRange)) return mkErr("#VALUE!");
+      if (sumRange.rows !== range.rows || sumRange.cols !== range.cols) {
+        return mkErr("#VALUE!", "합 범위 크기가 다름");
+      }
+      let total = ZERO;
+      for (let r = 0; r < range.rows; r++) {
+        for (let c = 0; c < range.cols; c++) {
+          if (!pred(range.at(r, c))) continue;
+          const n = toNumber(sumRange.at(r, c));
+          if (isErr(n)) return n;
+          total = add(total, n);
+        }
+      }
+      return total;
+    },
+  },
+  SUMIFS: {
+    min: 3,
+    call: (args) => {
+      const sumRange = args[0]();
+      if (!isRange(sumRange)) return mkErr("#VALUE!");
+      const mask = criteriaMask(args, 1, sumRange);
+      if (isErr(mask)) return mask;
+      let total = ZERO;
+      let k = 0;
+      for (let r = 0; r < sumRange.rows; r++) {
+        for (let c = 0; c < sumRange.cols; c++) {
+          if (mask[k]) {
+            const n = toNumber(sumRange.at(r, c));
+            if (isErr(n)) return n;
+            total = add(total, n);
+          }
+          k++;
+        }
+      }
+      return total;
+    },
+  },
+  COUNTIFS: {
+    min: 2,
+    call: (args) => {
+      const first = args[0]();
+      if (!isRange(first)) return mkErr("#VALUE!");
+      const mask = criteriaMask(args, 0, first);
+      if (isErr(mask)) return mask;
+      return frac(BigInt(mask.filter(Boolean).length));
+    },
+  },
+  AVERAGEIF: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const range = args[0]();
+      if (!isRange(range)) return mkErr("#VALUE!");
+      const crit = toScalar(args[1]());
+      if (isErr(crit)) return crit;
+      const pred = parseCriteria(crit);
+      const avgRange = args.length > 2 ? args[2]() : range;
+      if (!isRange(avgRange)) return mkErr("#VALUE!");
+      if (avgRange.rows !== range.rows || avgRange.cols !== range.cols) {
+        return mkErr("#VALUE!", "평균 범위 크기가 다름");
+      }
+      let total = ZERO;
+      let count = 0;
+      for (let r = 0; r < range.rows; r++) {
+        for (let c = 0; c < range.cols; c++) {
+          if (!pred(range.at(r, c))) continue;
+          const n = toNumber(avgRange.at(r, c));
+          if (isErr(n)) return n;
+          total = add(total, n);
+          count++;
+        }
+      }
+      return count === 0 ? mkErr("#DIV/0!") : div(total, frac(BigInt(count)));
+    },
+  },
+  AVERAGEIFS: {
+    min: 3,
+    call: (args) => {
+      const avgRange = args[0]();
+      if (!isRange(avgRange)) return mkErr("#VALUE!");
+      const mask = criteriaMask(args, 1, avgRange);
+      if (isErr(mask)) return mask;
+      let total = ZERO;
+      let count = 0;
+      let k = 0;
+      for (let r = 0; r < avgRange.rows; r++) {
+        for (let c = 0; c < avgRange.cols; c++) {
+          if (mask[k]) {
+            const n = toNumber(avgRange.at(r, c));
+            if (isErr(n)) return n;
+            total = add(total, n);
+            count++;
+          }
+          k++;
+        }
+      }
+      return count === 0 ? mkErr("#DIV/0!") : div(total, frac(BigInt(count)));
+    },
+  },
+  MAXIFS: {
+    min: 3,
+    call: (args) => {
+      const targetRange = args[0]();
+      if (!isRange(targetRange)) return mkErr("#VALUE!");
+      const mask = criteriaMask(args, 1, targetRange);
+      if (isErr(mask)) return mask;
+      let best: Frac | null = null;
+      let k = 0;
+      for (let r = 0; r < targetRange.rows; r++) {
+        for (let c = 0; c < targetRange.cols; c++) {
+          if (mask[k]) {
+            const cell = targetRange.at(r, c);
+            if (isFrac(cell) && (best === null || cmp(cell, best) > 0)) best = cell;
+          }
+          k++;
+        }
+      }
+      return best ?? ZERO;
+    },
+  },
+  MINIFS: {
+    min: 3,
+    call: (args) => {
+      const targetRange = args[0]();
+      if (!isRange(targetRange)) return mkErr("#VALUE!");
+      const mask = criteriaMask(args, 1, targetRange);
+      if (isErr(mask)) return mask;
+      let best: Frac | null = null;
+      let k = 0;
+      for (let r = 0; r < targetRange.rows; r++) {
+        for (let c = 0; c < targetRange.cols; c++) {
+          if (mask[k]) {
+            const cell = targetRange.at(r, c);
+            if (isFrac(cell) && (best === null || cmp(cell, best) < 0)) best = cell;
+          }
+          k++;
+        }
+      }
+      return best ?? ZERO;
+    },
+  },
+  IFS: {
+    min: 2,
+    call: (args) => {
+      for (let i = 0; i + 1 < args.length; i += 2) {
+        const c = bool(args[i]());
+        if (isErr(c)) return c;
+        if (c) return args[i + 1]();
+      }
+      return mkErr("#N/A");
+    },
+  },
+  SWITCH: {
+    min: 3,
+    call: (args) => {
+      const target = toScalar(args[0]());
+      if (isErr(target)) return target;
+      let i = 1;
+      for (; i + 1 < args.length; i += 2) {
+        const cand = toScalar(args[i]());
+        if (isErr(cand)) return cand;
+        if (equalScalars(target, cand)) return args[i + 1]();
+      }
+      return i < args.length ? args[i]() : mkErr("#N/A");
+    },
+  },
+  XLOOKUP: {
+    min: 3,
+    max: 6,
+    call: (args) => {
+      const lookup = toScalar(args[0]());
+      if (isErr(lookup)) return lookup;
+      const lookupRange = args[1]();
+      const returnRange = args[2]();
+      if (!isRange(lookupRange) || !isRange(returnRange)) return mkErr("#VALUE!");
+      const n = lookupRange.rows * lookupRange.cols;
+      if (n !== returnRange.rows * returnRange.cols) {
+        return mkErr("#VALUE!", "찾을 범위 · 돌려줄 범위 크기가 다름");
+      }
+      const at = (rv: RangeValue, i: number): Scalar => (rv.rows === 1 ? rv.at(0, i) : rv.at(i, 0));
+      const modeN = args.length > 4 ? num(args[4]()) : ZERO;
+      if (isErr(modeN)) return modeN;
+      const mode = Math.trunc(fracToDouble(modeN));
+      const searchN = args.length > 5 ? num(args[5]()) : ONE;
+      if (isErr(searchN)) return searchN;
+      const reverse = Math.trunc(fracToDouble(searchN)) < 0;
+      let best = -1;
+      for (let step = 0; step < n; step++) {
+        const i = reverse ? n - 1 - step : step;
+        const key = at(lookupRange, i);
+        if (typeRank(key) !== typeRank(lookup)) continue;
+        const c = compareScalars(key, lookup);
+        if (c === 0) {
+          best = i;
+          break;
+        }
+        if (mode === 1 && c > 0) {
+          if (best < 0 || compareScalars(key, at(lookupRange, best)) < 0) best = i;
+        } else if (mode === -1 && c < 0) {
+          if (best < 0 || compareScalars(key, at(lookupRange, best)) > 0) best = i;
+        }
+      }
+      if (best < 0) return args.length > 3 ? args[3]() : mkErr("#N/A");
+      return at(returnRange, best);
+    },
+  },
+};
diff --git a/A00_Common/spreadsheet/spreadsheet_functions_math.ts b/A00_Common/spreadsheet/spreadsheet_functions_math.ts
index 99f21e12..6d65b53e 100644
--- a/A00_Common/spreadsheet/spreadsheet_functions_math.ts
+++ b/A00_Common/spreadsheet/spreadsheet_functions_math.ts
@@ -415,4 +415,76 @@ export const MATH_FUNCTIONS: Record<string, SheetFunction> = {
       return div(values.reduce(add, ZERO), frac(BigInt(values.length)));
     },
   },
+  MROUND: {
+    min: 2,
+    max: 2,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      const m = num(args[1]());
+      if (isErr(m)) return m;
+      if (cmp(m, ZERO) === 0) return ZERO;
+      if (cmp(n, ZERO) !== 0 && cmp(n, ZERO) > 0 !== cmp(m, ZERO) > 0) {
+        return mkErr("#NUM!", "수 · 배수의 부호가 다름");
+      }
+      return mul(frac(toInteger(div(n, m), "round")), m);
+    },
+  },
+  ODD: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      let v = toInteger(n, "away");
+      if (v === 0n) v = 1n;
+      else if (v % 2n === 0n) v += v < 0n ? -1n : 1n;
+      return frac(v);
+    },
+  },
+  EVEN: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      let v = toInteger(n, "away");
+      if (v % 2n !== 0n) v += v < 0n ? -1n : 1n;
+      return frac(v);
+    },
+  },
+  LOG: {
+    min: 1,
+    max: 2,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      if (cmp(n, ZERO) <= 0) return mkErr("#NUM!");
+      const base = args.length > 1 ? num(args[1]()) : frac(10n);
+      if (isErr(base)) return base;
+      if (cmp(base, ZERO) <= 0 || cmp(base, ONE) === 0) return mkErr("#NUM!");
+      return fromDouble(Math.log(fracToDouble(n)) / Math.log(fracToDouble(base)));
+    },
+  },
+  LOG10: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      if (cmp(n, ZERO) <= 0) return mkErr("#NUM!");
+      return fromDouble(Math.log10(fracToDouble(n)));
+    },
+  },
+  LN: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      if (isErr(n)) return n;
+      if (cmp(n, ZERO) <= 0) return mkErr("#NUM!");
+      return fromDouble(Math.log(fracToDouble(n)));
+    },
+  },
+  EXP: unaryDouble(Math.exp),
 };
diff --git a/A00_Common/spreadsheet/spreadsheet_functions_misc.ts b/A00_Common/spreadsheet/spreadsheet_functions_misc.ts
index 10d4916a..dd33073f 100644
--- a/A00_Common/spreadsheet/spreadsheet_functions_misc.ts
+++ b/A00_Common/spreadsheet/spreadsheet_functions_misc.ts
@@ -1,12 +1,12 @@
 /* =============================================================================
  * spreadsheet_functions_misc.ts  (주인 B)
- * 논리 · 글 · 찾기 · 세기 함수. 형 바꾸기 도우미는 `spreadsheet_functions_math.ts` 공용 것을 씀.
- * 뜻 · 경계값은 엑셀과 같게(Formula.js 는 시험 대조 답으로만).
+ * 논리 · 글 · 정보 · 날짜 함수. 찾기 · 조건부 세기/합/평균/최대/최소는
+ * `spreadsheet_functions_lookup.ts` 로 옮김(700 줄 규칙 · 2026-09-27).
+ * 형 바꾸기 도우미는 `spreadsheet_functions_math.ts` 공용 것을 씀.
  * ========================================================================== */
 
 import {
   ZERO,
-  add,
   cmp,
   frac,
   mul,
@@ -15,12 +15,12 @@ import {
   toInteger,
   type Frac,
 } from "@ui/sheet/ui_template_sheet_frac";
-import type { ErrorValue, LazyArg, RangeValue, Scalar, SheetFunction } from "./spreadsheet_types";
+import type { ErrorValue, LazyArg, SheetFunction } from "./spreadsheet_types";
 import { formatValue } from "./spreadsheet_numfmt";
 import {
   bool,
-  collectNumbers,
   fracToDouble,
+  fromDouble,
   isErr,
   isFrac,
   isRange,
@@ -28,82 +28,19 @@ import {
   num,
   str,
   toBool,
-  toNumber,
   toScalar,
   toText,
 } from "./spreadsheet_functions_math";
 
 const ONE = frac(1n);
 
-// ── 값 견줌(찾기 · 세기 함수 공용) ───────────────────────────────────────────
-
-function typeRank(v: Scalar): number {
-  if (v === null) return -1;
-  if (isFrac(v)) return 0;
-  if (typeof v === "string") return 1;
-  if (typeof v === "boolean") return 2;
-  return 3;
-}
-
-function compareScalars(a: Scalar, b: Scalar): number {
-  if (isFrac(a) && isFrac(b)) return cmp(a, b);
-  if (typeof a === "string" && typeof b === "string") {
-    const la = a.toUpperCase();
-    const lb = b.toUpperCase();
-    return la < lb ? -1 : la > lb ? 1 : 0;
-  }
-  if (typeof a === "boolean" && typeof b === "boolean") return a === b ? 0 : a ? 1 : -1;
-  return 0;
-}
-
-function equalScalars(a: Scalar, b: Scalar): boolean {
-  return typeRank(a) === typeRank(b) && compareScalars(a, b) === 0;
-}
-
-function wrapScalar(v: Scalar): RangeValue {
-  return { kind: "range", rows: 1, cols: 1, at: () => v };
-}
-
-// ── 조건 글(`>10` · `<=5` · `사과*`) ─────────────────────────────────────────
-
-function wildcardToRegex(text: string): RegExp {
+/** SEARCH — 통짜 맞춤이 아니라 안 어디서든 찾음(자리 없이 그대로 씀). */
+function wildcardToSearchRegex(text: string): RegExp {
   const escaped = text
     .replace(/[.+^${}()|[\]\\]/g, "\\$&")
     .replace(/\*/g, ".*")
     .replace(/\?/g, ".");
-  return new RegExp(`^${escaped}$`, "i");
-}
-
-function parseCriteria(crit: Scalar): (cell: Scalar) => boolean {
-  if (crit === null) return (cell) => cell === null;
-  if (typeof crit === "boolean") return (cell) => typeof cell === "boolean" && cell === crit;
-  if (isFrac(crit)) return (cell) => isFrac(cell) && cmp(cell, crit) === 0;
-  if (isErr(crit)) return () => false;
-  const m = /^(<=|>=|<>|<|>|=)?(.*)$/.exec(crit);
-  const op = m?.[1] ?? "";
-  const rest = m?.[2] ?? crit;
-  let numRest: Frac | null = null;
-  try {
-    numRest = rest.trim() === "" ? null : parseDecimal(rest);
-  } catch {
-    numRest = null;
-  }
-  if (numRest !== null) {
-    const nr = numRest;
-    return (cell) => {
-      if (!isFrac(cell)) return false;
-      const c = cmp(cell, nr);
-      if (op === "<=") return c <= 0;
-      if (op === ">=") return c >= 0;
-      if (op === "<>") return c !== 0;
-      if (op === "<") return c < 0;
-      if (op === ">") return c > 0;
-      return c === 0;
-    };
-  }
-  const pat = wildcardToRegex(rest);
-  if (op === "<>") return (cell) => !(typeof cell === "string" && pat.test(cell));
-  return (cell) => typeof cell === "string" && pat.test(cell);
+  return new RegExp(escaped, "i");
 }
 
 // ── 숫자 → 고정 소수 글(FIXED) ───────────────────────────────────────────────
@@ -126,8 +63,6 @@ function formatFixed(n: Frac, decimals: number, commas: boolean): string {
   return negative ? `-${body}` : body;
 }
 
-// ── 함수 표 ──────────────────────────────────────────────────────────────
-
 function collectBools(args: LazyArg[]): boolean[] | ErrorValue {
   const out: boolean[] = [];
   for (const a of args) {
@@ -152,6 +87,23 @@ function collectBools(args: LazyArg[]): boolean[] | ErrorValue {
   return out;
 }
 
+// ── 날짜 일련번호(엑셀 1900 체계 · 1970-01-01 = 25569) ───────────────────────
+// 1900 을 윤년 취급하는 옛 버그는 그대로 두지 않음(1900 년대 자체를 실무가 안 씀) —
+// 유닉스 자정 기준으로 바로 셈해 1900 년 2 월 안쪽만 어긋남(1단계 밖).
+
+const MS_PER_DAY = 86400000;
+const UNIX_EPOCH_AS_EXCEL_SERIAL = 25569;
+
+function serialToDate(serial: number): Date {
+  return new Date(Math.round((serial - UNIX_EPOCH_AS_EXCEL_SERIAL) * MS_PER_DAY));
+}
+
+function dateToSerial(d: Date): number {
+  return d.getTime() / MS_PER_DAY + UNIX_EPOCH_AS_EXCEL_SERIAL;
+}
+
+// ── 함수 표 ──────────────────────────────────────────────────────────────
+
 export const MISC_FUNCTIONS: Record<string, SheetFunction> = {
   IF: {
     min: 2,
@@ -311,217 +263,207 @@ export const MISC_FUNCTIONS: Record<string, SheetFunction> = {
       }
     },
   },
-  VLOOKUP: {
+  TEXTJOIN: {
     min: 3,
-    max: 4,
     call: (args) => {
-      const lookup = toScalar(args[0]());
-      if (isErr(lookup)) return lookup;
-      const table = args[1]();
-      if (!isRange(table)) return mkErr("#VALUE!");
-      const colN = num(args[2]());
-      if (isErr(colN)) return colN;
-      const col = Math.trunc(fracToDouble(colN)) - 1;
-      if (col < 0 || col >= table.cols) return mkErr("#REF!");
-      const approxRaw = args.length > 3 ? bool(args[3]()) : true;
-      if (isErr(approxRaw)) return approxRaw;
-      if (approxRaw) {
-        let best = -1;
-        for (let r = 0; r < table.rows; r++) {
-          const key = table.at(r, 0);
-          if (typeRank(key) !== typeRank(lookup)) {
-            if (best >= 0) break;
-            continue;
-          }
-          if (compareScalars(key, lookup) <= 0) best = r;
-          else break;
-        }
-        if (best < 0) return mkErr("#N/A");
-        return table.at(best, col);
-      }
-      for (let r = 0; r < table.rows; r++) {
-        if (equalScalars(table.at(r, 0), lookup)) return table.at(r, col);
-      }
-      return mkErr("#N/A");
-    },
-  },
-  HLOOKUP: {
-    min: 3,
-    max: 4,
-    call: (args) => {
-      const lookup = toScalar(args[0]());
-      if (isErr(lookup)) return lookup;
-      const table = args[1]();
-      if (!isRange(table)) return mkErr("#VALUE!");
-      const rowN = num(args[2]());
-      if (isErr(rowN)) return rowN;
-      const row = Math.trunc(fracToDouble(rowN)) - 1;
-      if (row < 0 || row >= table.rows) return mkErr("#REF!");
-      const approxRaw = args.length > 3 ? bool(args[3]()) : true;
-      if (isErr(approxRaw)) return approxRaw;
-      if (approxRaw) {
-        let best = -1;
-        for (let c = 0; c < table.cols; c++) {
-          const key = table.at(0, c);
-          if (typeRank(key) !== typeRank(lookup)) {
-            if (best >= 0) break;
-            continue;
-          }
-          if (compareScalars(key, lookup) <= 0) best = c;
-          else break;
-        }
-        if (best < 0) return mkErr("#N/A");
-        return table.at(row, best);
-      }
-      for (let c = 0; c < table.cols; c++) {
-        if (equalScalars(table.at(0, c), lookup)) return table.at(row, c);
-      }
-      return mkErr("#N/A");
-    },
-  },
-  INDEX: {
-    min: 2,
-    max: 3,
-    call: (args) => {
-      const rangeArg = args[0]();
-      if (isErr(rangeArg)) return rangeArg;
-      const range = isRange(rangeArg) ? rangeArg : wrapScalar(rangeArg);
-      const rowN = num(args[1]());
-      if (isErr(rowN)) return rowN;
-      const row = Math.trunc(fracToDouble(rowN));
-      const colN = args.length > 2 ? num(args[2]()) : frac(range.cols === 1 ? 1n : 0n);
-      if (isErr(colN)) return colN;
-      const col = Math.trunc(fracToDouble(colN));
-      if (row === 0 && col === 0) return mkErr("#VALUE!");
-      if (row === 0) {
-        if (col < 1 || col > range.cols) return mkErr("#REF!");
-        const c = col - 1;
-        return { kind: "range", rows: range.rows, cols: 1, at: (r: number) => range.at(r, c) };
-      }
-      if (col === 0) {
-        if (row < 1 || row > range.rows) return mkErr("#REF!");
-        const r = row - 1;
-        return {
-          kind: "range",
-          rows: 1,
-          cols: range.cols,
-          at: (_r: number, c: number) => range.at(r, c),
-        };
-      }
-      if (row < 1 || row > range.rows || col < 1 || col > range.cols) return mkErr("#REF!");
-      return range.at(row - 1, col - 1);
-    },
-  },
-  MATCH: {
-    min: 2,
-    max: 3,
-    call: (args) => {
-      const lookup = toScalar(args[0]());
-      if (isErr(lookup)) return lookup;
-      const rangeArg = args[1]();
-      if (!isRange(rangeArg)) return mkErr("#VALUE!");
-      if (rangeArg.rows !== 1 && rangeArg.cols !== 1) {
-        return mkErr("#VALUE!", "한 줄 · 한 칸짜리 범위만");
-      }
-      const n = rangeArg.rows === 1 ? rangeArg.cols : rangeArg.rows;
-      const at = (i: number): Scalar =>
-        rangeArg.rows === 1 ? rangeArg.at(0, i) : rangeArg.at(i, 0);
-      const modeN = args.length > 2 ? num(args[2]()) : ONE;
-      if (isErr(modeN)) return modeN;
-      const mode = Math.trunc(fracToDouble(modeN));
-      if (mode === 0) {
-        for (let i = 0; i < n; i++) if (equalScalars(at(i), lookup)) return frac(BigInt(i + 1));
-        return mkErr("#N/A");
-      }
-      let best = -1;
-      for (let i = 0; i < n; i++) {
-        const key = at(i);
-        if (typeRank(key) !== typeRank(lookup)) {
-          if (best >= 0) break;
-          continue;
-        }
-        const c = compareScalars(key, lookup);
-        if (mode > 0 ? c <= 0 : c >= 0) best = i;
-        else break;
-      }
-      if (best < 0) return mkErr("#N/A");
-      return frac(BigInt(best + 1));
-    },
-  },
-  CHOOSE: {
-    min: 2,
-    call: (args) => {
-      const idxN = num(args[0]());
-      if (isErr(idxN)) return idxN;
-      const idx = Math.trunc(fracToDouble(idxN));
-      if (idx < 1 || idx > args.length - 1) return mkErr("#VALUE!");
-      return args[idx]();
-    },
-  },
-  COUNT: {
-    min: 0,
-    call: (args) => {
-      const values = collectNumbers(args, false, false);
-      return isErr(values) ? values : frac(BigInt(values.length));
-    },
-  },
-  COUNTA: {
-    min: 0,
-    call: (args) => {
-      let count = 0;
-      for (const a of args) {
-        const v = a();
+      const delim = str(args[0]());
+      if (isErr(delim)) return delim;
+      const ignoreEmpty = bool(args[1]());
+      if (isErr(ignoreEmpty)) return ignoreEmpty;
+      const parts: string[] = [];
+      for (let i = 2; i < args.length; i++) {
+        const v = args[i]();
         if (isRange(v)) {
           for (let r = 0; r < v.rows; r++) {
-            for (let c = 0; c < v.cols; c++) if (v.at(r, c) !== null) count++;
+            for (let c = 0; c < v.cols; c++) {
+              const t = toText(v.at(r, c));
+              if (isErr(t)) return t;
+              if (!(ignoreEmpty && t === "")) parts.push(t);
+            }
           }
-        } else if (v !== null) {
-          count++;
+        } else {
+          const t = str(v);
+          if (isErr(t)) return t;
+          if (!(ignoreEmpty && t === "")) parts.push(t);
         }
       }
-      return frac(BigInt(count));
+      return parts.join(delim);
     },
   },
-  COUNTIF: {
+  TRIM: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const s = str(args[0]());
+      return isErr(s) ? s : s.split(" ").filter(Boolean).join(" ");
+    },
+  },
+  UPPER: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const s = str(args[0]());
+      return isErr(s) ? s : s.toUpperCase();
+    },
+  },
+  LOWER: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const s = str(args[0]());
+      return isErr(s) ? s : s.toLowerCase();
+    },
+  },
+  SUBSTITUTE: {
+    min: 3,
+    max: 4,
+    call: (args) => {
+      const text = str(args[0]());
+      if (isErr(text)) return text;
+      const oldT = str(args[1]());
+      if (isErr(oldT)) return oldT;
+      const newT = str(args[2]());
+      if (isErr(newT)) return newT;
+      if (oldT === "") return text;
+      if (args.length <= 3) return text.split(oldT).join(newT);
+      const nthArg = num(args[3]());
+      if (isErr(nthArg)) return nthArg;
+      const nth = Math.trunc(fracToDouble(nthArg));
+      let idx = -1;
+      let count = 0;
+      let pos = 0;
+      for (;;) {
+        const found = text.indexOf(oldT, pos);
+        if (found < 0) break;
+        count++;
+        if (count === nth) {
+          idx = found;
+          break;
+        }
+        pos = found + oldT.length;
+      }
+      return idx < 0 ? text : text.slice(0, idx) + newT + text.slice(idx + oldT.length);
+    },
+  },
+  REPLACE: {
+    min: 4,
+    max: 4,
+    call: (args) => {
+      const text = str(args[0]());
+      if (isErr(text)) return text;
+      const startN = num(args[1]());
+      if (isErr(startN)) return startN;
+      const lenN = num(args[2]());
+      if (isErr(lenN)) return lenN;
+      const newText = str(args[3]());
+      if (isErr(newText)) return newText;
+      const start = Math.trunc(fracToDouble(startN));
+      const len = Math.max(0, Math.trunc(fracToDouble(lenN)));
+      if (start < 1) return mkErr("#VALUE!");
+      return text.slice(0, start - 1) + newText + text.slice(start - 1 + len);
+    },
+  },
+  FIND: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const findT = str(args[0]());
+      if (isErr(findT)) return findT;
+      const within = str(args[1]());
+      if (isErr(within)) return within;
+      const startArg = args.length > 2 ? num(args[2]()) : ONE;
+      if (isErr(startArg)) return startArg;
+      const start = Math.trunc(fracToDouble(startArg));
+      if (start < 1) return mkErr("#VALUE!");
+      const idx = within.indexOf(findT, start - 1);
+      return idx < 0 ? mkErr("#VALUE!") : frac(BigInt(idx + 1));
+    },
+  },
+  SEARCH: {
+    min: 2,
+    max: 3,
+    call: (args) => {
+      const findT = str(args[0]());
+      if (isErr(findT)) return findT;
+      const within = str(args[1]());
+      if (isErr(within)) return within;
+      const startArg = args.length > 2 ? num(args[2]()) : ONE;
+      if (isErr(startArg)) return startArg;
+      const start = Math.trunc(fracToDouble(startArg));
+      if (start < 1) return mkErr("#VALUE!");
+      const pat = wildcardToSearchRegex(findT);
+      const m = pat.exec(within.slice(start - 1));
+      return m ? frac(BigInt(m.index + start)) : mkErr("#VALUE!");
+    },
+  },
+  REPT: {
     min: 2,
     max: 2,
     call: (args) => {
-      const range = args[0]();
-      if (!isRange(range)) return mkErr("#VALUE!");
-      const crit = toScalar(args[1]());
-      if (isErr(crit)) return crit;
-      const pred = parseCriteria(crit);
-      let count = 0;
-      for (let r = 0; r < range.rows; r++) {
-        for (let c = 0; c < range.cols; c++) if (pred(range.at(r, c))) count++;
-      }
-      return frac(BigInt(count));
+      const s = str(args[0]());
+      if (isErr(s)) return s;
+      const nArg = num(args[1]());
+      if (isErr(nArg)) return nArg;
+      const n = Math.trunc(fracToDouble(nArg));
+      return n < 0 ? mkErr("#VALUE!") : s.repeat(n);
     },
   },
-  SUMIF: {
-    min: 2,
+  ISNUMBER: { min: 1, max: 1, call: (args) => isFrac(toScalar(args[0]())) },
+  ISTEXT: { min: 1, max: 1, call: (args) => typeof toScalar(args[0]()) === "string" },
+  ISBLANK: { min: 1, max: 1, call: (args) => toScalar(args[0]()) === null },
+  ISERROR: { min: 1, max: 1, call: (args) => isErr(toScalar(args[0]())) },
+  NA: { min: 0, max: 0, call: () => mkErr("#N/A") },
+  TODAY: {
+    min: 0,
+    max: 0,
+    call: () => {
+      const now = new Date();
+      const midnight = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate());
+      return fromDouble(dateToSerial(new Date(midnight)));
+    },
+  },
+  DATE: {
+    min: 3,
     max: 3,
     call: (args) => {
-      const range = args[0]();
-      if (!isRange(range)) return mkErr("#VALUE!");
-      const crit = toScalar(args[1]());
-      if (isErr(crit)) return crit;
-      const pred = parseCriteria(crit);
-      const sumRange = args.length > 2 ? args[2]() : range;
-      if (!isRange(sumRange)) return mkErr("#VALUE!");
-      if (sumRange.rows !== range.rows || sumRange.cols !== range.cols) {
-        return mkErr("#VALUE!", "합 범위 크기가 다름");
-      }
-      let total = ZERO;
-      for (let r = 0; r < range.rows; r++) {
-        for (let c = 0; c < range.cols; c++) {
-          if (!pred(range.at(r, c))) continue;
-          const n = toNumber(sumRange.at(r, c));
-          if (isErr(n)) return n;
-          total = add(total, n);
-        }
-      }
-      return total;
+      const y = num(args[0]());
+      if (isErr(y)) return y;
+      const m = num(args[1]());
+      if (isErr(m)) return m;
+      const d = num(args[2]());
+      if (isErr(d)) return d;
+      const date = new Date(
+        Date.UTC(
+          Math.trunc(fracToDouble(y)),
+          Math.trunc(fracToDouble(m)) - 1,
+          Math.trunc(fracToDouble(d)),
+        ),
+      );
+      return fromDouble(dateToSerial(date));
+    },
+  },
+  YEAR: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      return isErr(n) ? n : frac(BigInt(serialToDate(fracToDouble(n)).getUTCFullYear()));
+    },
+  },
+  MONTH: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      return isErr(n) ? n : frac(BigInt(serialToDate(fracToDouble(n)).getUTCMonth() + 1));
+    },
+  },
+  DAY: {
+    min: 1,
+    max: 1,
+    call: (args) => {
+      const n = num(args[0]());
+      return isErr(n) ? n : frac(BigInt(serialToDate(fracToDouble(n)).getUTCDate()));
     },
   },
 };
diff --git a/A00_Common/spreadsheet/spreadsheet_keys.ts b/A00_Common/spreadsheet/spreadsheet_keys.ts
index 2e5cdfcb..22315c3a 100644
--- a/A00_Common/spreadsheet/spreadsheet_keys.ts
+++ b/A00_Common/spreadsheet/spreadsheet_keys.ts
@@ -31,7 +31,19 @@ const ARROWS: Record<string, [number, number]> = {
   ArrowRight: [0, 1],
 };
 
-export function attachKeys(ctx: SpreadsheetContext, ed: Editor): () => void {
+/** 2단계 잇기 자리 — 부른 쪽(spreadsheet.ts)이 채움 */
+export interface KeyHooks {
+  /** Ctrl+F · Shift+F5 찾기 · Ctrl+H 바꾸기 */
+  find?(replace: boolean): void;
+  /** Ctrl+Shift+V — 곧 올 paste 사건을 골라 붙여넣기로 */
+  pasteSpecial?(): void;
+  /** Shift+F2 메모 편집 */
+  comment?(): void;
+  /** 고름 중 Esc(서식 붓 끄기 등) */
+  escape?(): void;
+}
+
+export function attachKeys(ctx: SpreadsheetContext, ed: Editor, hooks: KeyHooks = {}): () => void {
   const go = (sel: Selection): void => ctx.select(sel, true);
 
   /** 확정 뒤 한 칸 — 고름이 여러 칸이면 그 안에서 돎 */
@@ -56,6 +68,7 @@ export function attachKeys(ctx: SpreadsheetContext, ed: Editor): () => void {
         return true;
       }
       case "Tab":
+        if (!e.shiftKey && ed.accept()) return true; // 함수 자동 완성
         ed.commit();
         next(0, e.shiftKey ? -1 : 1);
         return true;
@@ -67,6 +80,7 @@ export function attachKeys(ctx: SpreadsheetContext, ed: Editor): () => void {
         return true;
     }
     const arrow = ARROWS[e.key];
+    if (arrow && !arrow[1] && !e.shiftKey && ed.suggestMove(arrow[0])) return true;
     if (!arrow || inBar || ed.mode() === "edit") return false;
     if (ed.pointable()) {
       ed.pointMove(arrow[0], arrow[1], e.shiftKey, ctrl);
@@ -116,6 +130,14 @@ export function attachKeys(ctx: SpreadsheetContext, ed: Editor): () => void {
         case "r":
           fill(k === "d");
           return true;
+        case "f":
+        case "h":
+          if (!hooks.find) return false;
+          hooks.find(k === "h");
+          return true;
+        case "v":
+          if (e.shiftKey) hooks.pasteSpecial?.();
+          return false; // paste 사건은 그대로 — E 클립보드 · 골라 붙여넣기가 받음
       }
       return false;
     }
@@ -126,9 +148,17 @@ export function attachKeys(ctx: SpreadsheetContext, ed: Editor): () => void {
       case "Tab":
         next(0, e.shiftKey ? -1 : 1);
         return true;
-      case "F2":
-        ed.begin();
+      case "F5": // Shift+F5 = 찾기(엑셀 · Ctrl+F 를 브라우저가 가로챌 때)
+        if (!e.shiftKey || !hooks.find) return false;
+        hooks.find(false);
         return true;
+      case "F2":
+        if (e.shiftKey) hooks.comment?.();
+        else ed.begin();
+        return true;
+      case "Escape":
+        hooks.escape?.();
+        return !!hooks.escape;
       case "Delete":
         if (!ctx.readOnly) ctx.dispatch({ 종류: "내용지움", 시트: sheet.id, 범위: sel.범위 });
         return true;
diff --git a/A00_Common/spreadsheet/spreadsheet_mouse.ts b/A00_Common/spreadsheet/spreadsheet_mouse.ts
index 5d0e706b..9100497f 100644
--- a/A00_Common/spreadsheet/spreadsheet_mouse.ts
+++ b/A00_Common/spreadsheet/spreadsheet_mouse.ts
@@ -6,6 +6,7 @@
  * 머리 끝(폭 · 높이 끌기)은 C 몫 — 여기서 건드리지 않음.
  * ========================================================================== */
 
+import { autofitColumn } from "./spreadsheet_autofit";
 import { fillCells } from "./spreadsheet_fill";
 import {
   hasValue,
@@ -18,7 +19,7 @@ import {
   selectRows,
   selectSpan,
 } from "./spreadsheet_selection";
-import { boxStyle, type Editor } from "./spreadsheet_editor";
+import { boxStyle, slotOf, type Editor } from "./spreadsheet_editor";
 import type { CellAddress, CellRange } from "./spreadsheet_types";
 import type { HitResult, Selection, SpreadsheetContext } from "./spreadsheet_view_types";
 
@@ -45,7 +46,19 @@ export function fillTarget(
   return { target: { ...src, c0: p.c }, clear: null };
 }
 
-export function attachMouse(ctx: SpreadsheetContext, ed: Editor): () => void {
+/** 2단계 잇기 자리 — 부른 쪽(spreadsheet.ts)이 채움 */
+export interface MouseHooks {
+  /** 칸 끌어 고르기가 끝남(서식 붓 바르기) */
+  selected?(): void;
+  /** 누르지 않고 움직일 때 가리킨 것(메모 풍선) — 격자 밖이면 null */
+  hover?(hit: HitResult | null): void;
+}
+
+export function attachMouse(
+  ctx: SpreadsheetContext,
+  ed: Editor,
+  hooks: MouseHooks = {},
+): () => void {
   const root = ctx.grid.root;
   const preview = document.createElement("div");
   preview.className = "ss-fill-preview";
@@ -80,8 +93,8 @@ export function attachMouse(ctx: SpreadsheetContext, ed: Editor): () => void {
 
   function showPreview(g: CellRange | null): void {
     if (!g) return preview.remove();
-    const a = ctx.grid.editorSlot(g.r0, g.c0);
-    const b = ctx.grid.editorSlot(Math.min(g.r1, LAST_R), Math.min(g.c1, LAST_C));
+    const a = slotOf(ctx, g.r0, g.c0);
+    const b = slotOf(ctx, Math.min(g.r1, LAST_R), Math.min(g.c1, LAST_C));
     if (preview.parentElement !== a.layer) a.layer.append(preview);
     boxStyle(preview, {
       x: a.box.x,
@@ -198,11 +211,14 @@ export function attachMouse(ctx: SpreadsheetContext, ed: Editor): () => void {
         ctx.select(first);
         const anchor = first.기준;
         let last = `${hit.r},${hit.c}`;
-        return drag((p) => {
-          if (`${p.r},${p.c}` === last) return;
-          last = `${p.r},${p.c}`;
-          ctx.select(selectSpan(sheet, anchor, p));
-        });
+        return drag(
+          (p) => {
+            if (`${p.r},${p.c}` === last) return;
+            last = `${p.r},${p.c}`;
+            ctx.select(selectSpan(sheet, anchor, p));
+          },
+          () => hooks.selected?.(),
+        );
       }
     }
   }
@@ -212,12 +228,28 @@ export function attachMouse(ctx: SpreadsheetContext, ed: Editor): () => void {
     const hit = ctx.grid.hitTest(e.clientX, e.clientY);
     if (!hit) return;
     if (hit.kind === "fillHandle") return fillDown();
+    if (hit.kind === "colEdge") {
+      // 고른 열 전체의 경계면 고른 열 모두(엑셀)
+      const g = ctx.selection.범위[0];
+      const whole = g.r0 === 0 && g.r1 === LAST_R && inRange(g, 0, hit.c);
+      for (let c = whole ? g.c0 : hit.c; c <= (whole ? g.c1 : hit.c); c++) autofitColumn(ctx, c);
+      return;
+    }
     if (hit.kind === "cell" && !ed.editing()) ed.begin();
   }
 
+  const onHover = (e: MouseEvent): void => {
+    if (!stopDrag && !e.buttons) hooks.hover?.(ctx.grid.hitTest(e.clientX, e.clientY));
+  };
+  const onLeave = (): void => hooks.hover?.(null);
+
   root.addEventListener("mousedown", onDown);
   root.addEventListener("dblclick", onDbl);
+  root.addEventListener("mousemove", onHover);
+  root.addEventListener("mouseleave", onLeave);
   return () => {
+    root.removeEventListener("mousemove", onHover);
+    root.removeEventListener("mouseleave", onLeave);
     stopDrag?.();
     preview.remove();
     root.removeEventListener("mousedown", onDown);
diff --git a/A00_Common/spreadsheet/spreadsheet_numfmt.ts b/A00_Common/spreadsheet/spreadsheet_numfmt.ts
index 1351fcab..b6533dff 100644
--- a/A00_Common/spreadsheet/spreadsheet_numfmt.ts
+++ b/A00_Common/spreadsheet/spreadsheet_numfmt.ts
@@ -14,6 +14,7 @@ import {
   fracToString,
   mul,
   roundAt,
+  sub,
   toInteger,
   type Frac,
 } from "@ui/sheet/ui_template_sheet_frac";
@@ -235,6 +236,130 @@ function renderNumericSection(toks: Tok[], magnitude: Frac): string {
   return out;
 }
 
+// ── 분수 형식(`0/0` · `# ?/?` · `# ??/??` · 분모 고정 `# ?/8`) ───────────────
+
+interface FracPlan {
+  prefix: Tok[];
+  wholeDigits: number; // 0 = 정수부 자리 없음(가분수로 통째)
+  sepToks: Tok[]; // 정수부 · 분자 사이 리터럴(보통 칸 하나)
+  fixedDenom: bigint | null; // null = 분모 자리표시(자동 찾기) · 있으면 그 값 고정
+  denomDigits: number; // 자동일 때 자리표시 개수(최대 분모 = 10^자리 - 1)
+  suffix: Tok[];
+}
+
+/** 슬래시 앞뒤 자리표시(0/#/?)·고정 숫자 자리를 찾음 — 없으면 분수 형식이 아님(null). */
+function detectFraction(toks: Tok[]): FracPlan | null {
+  if (toks.some((t) => t.k === "point")) return null;
+  const slashIdx = toks.findIndex((t) => t.k === "lit" && t.ch === "/");
+  if (slashIdx < 0) return null;
+
+  let i = slashIdx - 1;
+  while (i >= 0 && toks[i].k === "digit") i--;
+  const numeratorStart = i + 1;
+  if (numeratorStart === slashIdx) return null; // 분자 자리표시 없음
+
+  let j = slashIdx + 1;
+  let denomDigits = 0;
+  let fixedDigits = "";
+  let mode: "auto" | "fixed" | null = null;
+  while (j < toks.length) {
+    const t = toks[j];
+    if (t.k === "digit") {
+      if (mode === "fixed") break;
+      mode = "auto";
+      denomDigits++;
+      j++;
+      continue;
+    }
+    if (t.k === "lit" && /[0-9]/.test(t.ch)) {
+      if (mode === "auto") break;
+      mode = "fixed";
+      fixedDigits += t.ch;
+      j++;
+      continue;
+    }
+    break;
+  }
+  if (mode === null) return null;
+  const denomEnd = j;
+
+  const sepToks: Tok[] = [];
+  let k = numeratorStart - 1;
+  while (k >= 0 && toks[k].k !== "digit") {
+    sepToks.unshift(toks[k]);
+    k--;
+  }
+  let wholeDigits = 0;
+  while (k >= 0 && toks[k].k === "digit") {
+    wholeDigits++;
+    k--;
+  }
+  const prefix = wholeDigits > 0 ? toks.slice(0, k + 1) : toks.slice(0, numeratorStart);
+  if (wholeDigits === 0) sepToks.length = 0;
+
+  return {
+    prefix,
+    wholeDigits,
+    sepToks,
+    fixedDenom: mode === "fixed" ? BigInt(fixedDigits) : null,
+    denomDigits,
+    suffix: toks.slice(denomEnd),
+  };
+}
+
+/** 분모가 `maxDenom` 이하인 가장 가까운 분수(0 ≤ x) — 다 훑어봐도 999 번 안쪽(자리표시 최대 3 개). */
+function bestFraction(x: Frac, maxDenom: bigint): { num: bigint; den: bigint } {
+  let bestNum = 0n;
+  let bestDen = 1n;
+  let bestDiff: Frac | null = null;
+  for (let den = 1n; den <= maxDenom; den++) {
+    const num = toInteger(mul(x, frac(den)), "round");
+    const gap = sub(x, frac(num, den));
+    const diff = frac(gap.n < 0n ? -gap.n : gap.n, gap.d);
+    if (bestDiff === null || cmp(diff, bestDiff) < 0) {
+      bestDiff = diff;
+      bestNum = num;
+      bestDen = den;
+    }
+  }
+  return { num: bestNum, den: bestDen };
+}
+
+function renderFractionSection(plan: FracPlan, magnitude: Frac): string {
+  let whole = 0n;
+  let remainder = magnitude;
+  if (plan.wholeDigits > 0) {
+    whole = toInteger(magnitude, "trunc");
+    remainder = sub(magnitude, frac(whole));
+  }
+  let num: bigint;
+  let den: bigint;
+  if (plan.fixedDenom !== null) {
+    den = plan.fixedDenom;
+    num = toInteger(mul(remainder, frac(den)), "round");
+  } else {
+    const maxDenom = 10n ** BigInt(plan.denomDigits) - 1n;
+    const best = bestFraction(remainder, maxDenom);
+    num = best.num;
+    den = best.den;
+  }
+  if (plan.wholeDigits > 0 && den > 0n && num >= den) {
+    whole += num / den;
+    num %= den;
+  }
+  const fracText = num !== 0n ? `${num}/${den}` : "";
+
+  let out = "";
+  for (const t of plan.prefix) if (t.k === "lit") out += t.ch;
+  if (plan.wholeDigits > 0) {
+    if (whole !== 0n || fracText === "") out += whole.toString();
+    if (fracText !== "") for (const t of plan.sepToks) if (t.k === "lit") out += t.ch;
+  }
+  out += fracText;
+  for (const t of plan.suffix) if (t.k === "lit") out += t.ch;
+  return out;
+}
+
 function generalFormat(value: Frac): string {
   return fracToString(value);
 }
@@ -265,6 +390,11 @@ function formatNumber(value: Frac, code: string | undefined): FormattedText {
   if (color) extra.색 = color;
   if (fillChar) extra.채움글 = fillChar;
   const magnitude = cmp(value, ZERO) < 0 ? frac(-value.n, value.d) : value;
+  const fraction = detectFraction(toks);
+  if (fraction) {
+    const body = renderFractionSection(fraction, magnitude);
+    return { 글: (forceMinus ? "-" : "") + body, 정렬: "right", ...extra };
+  }
   if (!toks.some((t) => t.k === "digit" || t.k === "general")) {
     let out = "";
     for (const t of toks) if (t.k === "lit") out += t.ch;
diff --git a/A00_Common/spreadsheet/spreadsheet_sort_dialog.ts b/A00_Common/spreadsheet/spreadsheet_sort_dialog.ts
new file mode 100644
index 00000000..2c660248
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_sort_dialog.ts
@@ -0,0 +1,180 @@
+/* =============================================================================
+ * spreadsheet_sort_dialog.ts  (주인 A · 화면)
+ * 정렬 대화 상자 · 빠른 정렬(오름 · 내림). 엔진은 `spreadsheet_sortfilter.ts`(명령 `정렬`).
+ * 범위 = 고른 범위 · 칸 하나만 골랐으면 이어진 값 덩어리(엑셀 「현재 영역」) · 머리 행은 짐작해 켬.
+ *
+ * 잇는 법(D · sub7):
+ *   · 도구 모음 · 메뉴 「정렬…」 → `openSortDialog(ctx)` — 창을 `ctx.root` 에 띄우고 닫는 함수를 돌려줌.
+ *   · 「오름차순」 「내림차순」 단추 → `sortSelection(ctx, 내림)` — 활성 칸 열을 기준으로 바로 정렬.
+ *   · 막히면(병합 걸침 등) 토스트로 까닭을 보임 · 되돌리기는 `ctx.dispatch` 가 쌓음.
+ * ========================================================================== */
+
+import { createButton, el, showToast } from "@ui/ui_template_elements";
+import { currentLanguageIndex } from "@ui/ui_template_locale";
+import { colName, rangeToA1 } from "./spreadsheet_address";
+import { CommandError } from "./spreadsheet_commands";
+import { currentRegion, displayText, sortCommand } from "./spreadsheet_sortfilter";
+import type { SortKey, SortOptions } from "./spreadsheet_sortfilter";
+import type { CellRange } from "./spreadsheet_types";
+import type { SpreadsheetContext } from "./spreadsheet_view_types";
+import "./spreadsheet_sortfilter.css";
+
+const TEXT = {
+  Title: ["정렬", "Sort"],
+  Range: ["범위", "Range"],
+  Header: ["머리 행 있음", "My data has headers"],
+  Case: ["대소문자 구분", "Case sensitive"],
+  Column: ["열", "Column"],
+  Asc: ["오름차순", "Ascending"],
+  Desc: ["내림차순", "Descending"],
+  AddKey: ["기준 더하기", "Add level"],
+  RemoveKey: ["빼기", "Remove"],
+  Cancel: ["취소", "Cancel"],
+  Ok: ["정렬", "Sort"],
+};
+const t = (key: keyof typeof TEXT) => TEXT[key][currentLanguageIndex] ?? TEXT[key][0];
+
+/** 정렬 범위 — 칸 하나면 현재 영역 */
+function targetRange(ctx: SpreadsheetContext): CellRange {
+  const g = ctx.selection.범위[0];
+  if (g.r0 === g.r1 && g.c0 === g.c1)
+    return currentRegion(ctx.book, ctx.selection.시트, g.r0, g.c0);
+  return g;
+}
+
+/** 머리 행 짐작 — 첫 행이 모두 글이고 둘째 행에 글 아닌 값이 있으면 머리 */
+function guessHeader(ctx: SpreadsheetContext, rg: CellRange): boolean {
+  if (rg.r0 === rg.r1) return false;
+  const v = (r: number, c: number) => ctx.engine.value(ctx.selection.시트, r, c);
+  let allText = true;
+  let secondOther = false;
+  for (let c = rg.c0; c <= rg.c1; c++) {
+    const a = v(rg.r0, c);
+    const b = v(rg.r0 + 1, c);
+    if (a !== null && typeof a !== "string") allText = false;
+    if (b !== null && typeof b !== "string") secondOther = true;
+  }
+  return allText && secondOther;
+}
+
+function run(ctx: SpreadsheetContext, rg: CellRange, opts: SortOptions): boolean {
+  try {
+    ctx.dispatch(sortCommand(ctx.book, ctx.engine, ctx.selection.시트, rg, opts));
+    return true;
+  } catch (e) {
+    if (!(e instanceof CommandError)) throw e;
+    showToast(e.message, "error");
+    return false;
+  }
+}
+
+/** 활성 칸 열 기준 바로 정렬 */
+export function sortSelection(ctx: SpreadsheetContext, desc: boolean): void {
+  if (ctx.readOnly) return;
+  const rg = targetRange(ctx);
+  const c = Math.min(Math.max(ctx.selection.활성.c, rg.c0), rg.c1);
+  run(ctx, rg, { 머리: guessHeader(ctx, rg), 기준: [{ 열: c, 내림: desc }] });
+}
+
+/** 정렬 대화 상자 — 닫는 함수를 돌려줌 */
+export function openSortDialog(ctx: SpreadsheetContext): () => void {
+  const rg = targetRange(ctx);
+  const sheet = ctx.selection.시트;
+  const keys: SortKey[] = [{ 열: Math.min(Math.max(ctx.selection.활성.c, rg.c0), rg.c1) }];
+
+  const header = el("input", { attrs: { type: "checkbox" } });
+  header.checked = guessHeader(ctx, rg);
+  const caseBox = el("input", { attrs: { type: "checkbox" } });
+  const list = el("div", { className: "ss-sort__keys" });
+  const box = el("div", {
+    className: "ss-sort__box",
+    attrs: { role: "dialog", "aria-label": t("Title") },
+  });
+  const shade = el("div", { className: "ss-sort", children: [box] });
+
+  const columnLabel = (c: number) => {
+    const head = header.checked ? displayText(ctx.book, ctx.engine, sheet, rg.r0, c) : "";
+    return head ? `${colName(c)}: ${head}` : `${t("Column")} ${colName(c)}`;
+  };
+
+  function drawKeys() {
+    list.replaceChildren(
+      ...keys.map((k, i) => {
+        const col = el("select", { attrs: { "aria-label": t("Column") } });
+        for (let c = rg.c0; c <= rg.c1; c++)
+          col.append(el("option", { text: columnLabel(c), attrs: { value: String(c) } }));
+        col.value = String(k.열);
+        col.addEventListener("change", () => (k.열 = Number(col.value)));
+        const dir = el("select", {
+          children: [
+            el("option", { text: t("Asc"), attrs: { value: "asc" } }),
+            el("option", { text: t("Desc"), attrs: { value: "desc" } }),
+          ],
+        });
+        dir.value = k.내림 ? "desc" : "asc";
+        dir.addEventListener("change", () => (k.내림 = dir.value === "desc"));
+        const remove = createButton({
+          label: t("RemoveKey"),
+          variant: "ghost",
+          disabled: keys.length === 1,
+          onClick: () => {
+            keys.splice(i, 1);
+            drawKeys();
+          },
+        });
+        return el("div", { className: "ss-sort__row", children: [col, dir, remove] });
+      }),
+    );
+  }
+
+  const close = () => {
+    shade.remove();
+    document.removeEventListener("keydown", onKey, true);
+  };
+  const ok = () => {
+    if (run(ctx, rg, { 머리: header.checked, 기준: keys, 대소문자: caseBox.checked })) close();
+  };
+  const onKey = (ev: KeyboardEvent) => {
+    if (ev.key === "Escape") close();
+    else if (ev.key === "Enter" && !(ev.target instanceof HTMLSelectElement)) ok();
+    else return;
+    ev.preventDefault();
+    ev.stopPropagation();
+  };
+
+  header.addEventListener("change", drawKeys);
+  box.append(
+    el("div", { className: "ss-sort__title", text: t("Title") }),
+    el("div", { className: "ss-sort__meta", text: `${t("Range")} ${rangeToA1(rg)}` }),
+    el("label", { className: "ss-sort__meta", children: [header, t("Header")] }),
+    el("label", { className: "ss-sort__meta", children: [caseBox, t("Case")] }),
+    list,
+    el("div", {
+      className: "ss-sort__row",
+      children: [
+        createButton({
+          label: t("AddKey"),
+          variant: "ghost",
+          onClick: () => {
+            keys.push({ 열: rg.c0 });
+            drawKeys();
+          },
+        }),
+      ],
+    }),
+    el("div", {
+      className: "ss-sort__foot",
+      children: [
+        createButton({ label: t("Cancel"), variant: "ghost", onClick: close }),
+        createButton({ label: t("Ok"), onClick: ok }),
+      ],
+    }),
+  );
+  shade.addEventListener("mousedown", (ev) => {
+    if (ev.target === shade) close();
+  });
+  document.addEventListener("keydown", onKey, true);
+  drawKeys();
+  ctx.root.append(shade);
+  return close;
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_sortfilter.css b/A00_Common/spreadsheet/spreadsheet_sortfilter.css
new file mode 100644
index 00000000..57d40347
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_sortfilter.css
@@ -0,0 +1,128 @@
+/* spreadsheet_sortfilter.css (주인 A) — 정렬 대화 상자 · 자동 필터 단추 · 값 목록 창 */
+
+.ss-sort {
+  position: absolute;
+  inset: 0;
+  z-index: var(--z-dropdown);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgb(0 0 0 / 18%);
+}
+
+.ss-sort__box,
+.ss-filter__panel {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-8);
+  padding: var(--spacing-12);
+  background: var(--color-surface-raised);
+  color: var(--color-text-body);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-cards);
+  box-shadow: var(--shadow-lg);
+  font-size: 13px;
+}
+
+.ss-sort__box {
+  min-width: 360px;
+  max-width: 90%;
+}
+
+.ss-sort__title {
+  font-weight: 600;
+}
+
+.ss-sort__meta,
+.ss-sort__row,
+.ss-sort__foot,
+.ss-filter__foot {
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-8);
+}
+
+.ss-sort__meta {
+  color: var(--color-text-secondary);
+}
+
+.ss-sort__row select {
+  flex: 1;
+  padding: var(--spacing-4);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  background: var(--color-canvas);
+  color: inherit;
+}
+
+.ss-sort__foot,
+.ss-filter__foot {
+  justify-content: flex-end;
+}
+
+/* 필터 단추 층 — 크기 0(격자 조작을 막지 않음) · 단추만 누름 */
+.ss-filter__layer {
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 0;
+  height: 0;
+  overflow: visible;
+}
+
+.ss-filter__btn {
+  position: absolute;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  font-size: 9px;
+  line-height: 14px;
+  text-align: center;
+  cursor: pointer;
+  background: var(--color-surface);
+  color: var(--color-text-secondary);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+}
+
+.ss-filter__btn.is-on {
+  color: var(--color-royal-amethyst);
+  border-color: var(--color-royal-amethyst);
+}
+
+.ss-filter__panel {
+  position: absolute;
+  z-index: var(--z-dropdown);
+  width: 220px;
+}
+
+.ss-filter__list {
+  display: flex;
+  flex-direction: column;
+  max-height: 220px;
+  overflow: auto;
+  padding: var(--spacing-4);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  background: var(--color-canvas);
+}
+
+.ss-filter__list label {
+  display: flex;
+  gap: var(--spacing-4);
+  align-items: center;
+  white-space: nowrap;
+}
+
+.ss-filter__link {
+  padding: 2px var(--spacing-4);
+  text-align: left;
+  background: none;
+  border: none;
+  color: inherit;
+  cursor: pointer;
+}
+
+.ss-filter__link:hover {
+  background: var(--color-surface-sunken);
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_sortfilter.ts b/A00_Common/spreadsheet/spreadsheet_sortfilter.ts
new file mode 100644
index 00000000..e83f75f4
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_sortfilter.ts
@@ -0,0 +1,289 @@
+/* =============================================================================
+ * spreadsheet_sortfilter.ts  (주인 A)
+ * 정렬 · 자동 필터 엔진 — DOM 모름. 값 비교 · 보이는 글은 엔진(`CalcEngine`) · 숫자 형식(B)으로 셈.
+ * 명령은 결과(정렬 차례 · 걸러진 행)를 박아 둠 → 다시 하기가 같은 결과 · 적용은 `applyCommand` 가 여기로 넘김.
+ *
+ * 엑셀 규칙:
+ *   정렬 차례 — 오름: 수 < 글 < 참거짓(FALSE<TRUE) < 오류 · 내림은 거꾸로 · 빈 칸은 늘 맨 뒤 · 같은 값은 원래 차례.
+ *     글은 대소문자 가리지 않음(옵션으로 가림 = 소문자 먼저). 값은 계산값(식 칸은 푼 값).
+ *   정렬 옮김 — 범위 열만 행째 옮김 · 식은 복사처럼 상대 참조만 옮김(범위 밖에서 범위를 가리키던 식은 그대로) ·
+ *     서식 · 메모도 같이 · 행 높이는 제자리 · 걸러진 행은 제자리(보이는 행끼리만 정렬) · 병합이 걸치면 막음.
+ *   필터 — 첫 행 = 머리 · 값 목록 = 보이는 글(숫자 형식 적용) · 빈 칸 = "" · 조건 안 맞는 행은 `걸러짐`
+ *     (사용자 숨김과 따로) · 행열을 넣고 지우면 필터 범위 · 조건 열도 따라감 · 끄면 걸러짐 모두 풂.
+ *
+ * 잇는 법(D · sub7 · C · sub6):
+ *   · 정렬: 대화 상자 `openSortDialog(ctx)`(spreadsheet_sort_dialog.ts) · 도구 단추 `sortSelection(ctx, 내림)`.
+ *   · 필터: `attachFilter(ctx)`(spreadsheet_filter.ts) 를 부품 목록에 붙이고 grid.render() 뒤 `refresh()` ·
+ *     도구 단추 · Ctrl+Shift+L = `toggleFilter(ctx)`.
+ *   · 격자(C): 행 `걸러짐` 도 `숨김` 처럼 높이 0 — 머리의 숨김 표시는 사용자 `숨김` 만.
+ * ========================================================================== */
+
+import { formatValue } from "./spreadsheet_numfmt";
+import {
+  colIndex,
+  colName,
+  parseRange,
+  rangesOverlap,
+  rangeToA1,
+  toA1,
+} from "./spreadsheet_address";
+import { clone, CommandError, sheetOf } from "./spreadsheet_commands";
+import type { Of } from "./spreadsheet_commands";
+import { compareValues, isError, isFrac } from "./spreadsheet_eval";
+import { moveFormula, shiftSpan } from "./spreadsheet_refshift";
+import { MAX_COLS, MAX_ROWS } from "./spreadsheet_types";
+import type {
+  AutoFilter,
+  CalcEngine,
+  Cell,
+  CellRange,
+  Command,
+  CommandEffect,
+  Scalar,
+  Sheet,
+  Workbook,
+} from "./spreadsheet_types";
+
+export interface SortKey {
+  /** 기준 열(0 부터 · 범위 안) */
+  열: number;
+  내림?: boolean;
+}
+
+export interface SortOptions {
+  /** 첫 행 = 머리(정렬 안 함) */
+  머리: boolean;
+  기준: SortKey[];
+  /** 글 대소문자 가림 */
+  대소문자?: boolean;
+}
+
+const filtered = (s: Sheet, r: number) => !!s.행?.[r + 1]?.걸러짐;
+
+const rank = (v: Scalar) =>
+  isFrac(v) ? 0 : typeof v === "string" ? 1 : typeof v === "boolean" ? 2 : 3;
+
+const blank = (v: Scalar) => v === null || v === "";
+
+/** 엑셀 정렬 비교 — 빈 칸은 오름 · 내림 모두 맨 뒤 */
+export function sortCompare(a: Scalar, b: Scalar, desc = false, caseSensitive = false): number {
+  if (blank(a) || blank(b)) return blank(a) === blank(b) ? 0 : blank(a) ? 1 : -1;
+  let d = rank(a) - rank(b);
+  if (d === 0 && !isError(a)) {
+    if (typeof a === "string" && caseSensitive) d = COLLATE_CASE.compare(a, b as string);
+    else if (typeof a === "string") d = COLLATE.compare(a, b as string);
+    else d = compareValues(a, b);
+  }
+  return desc ? -d : d;
+}
+
+const COLLATE = new Intl.Collator("ko", { sensitivity: "accent" });
+const COLLATE_CASE = new Intl.Collator("ko", { sensitivity: "variant", caseFirst: "lower" });
+
+/** 칸 하나에서 이어진 값 덩어리(엑셀 「현재 영역」) — 빈 칸만 둘러싼 테두리까지 늘림 */
+export function currentRegion(book: Workbook, sheetId: string, r: number, c: number): CellRange {
+  const s = sheetOf(book, sheetId);
+  const filled = new Set<string>();
+  for (const [a1, cell] of Object.entries(s.칸))
+    if (cell.값 !== undefined || cell.식 !== undefined) filled.add(a1);
+  const has = (rr: number, cc: number) =>
+    rr >= 0 && cc >= 0 && rr < MAX_ROWS && cc < MAX_COLS && filled.has(toA1(rr, cc));
+  const g = { r0: r, c0: c, r1: r, c1: c };
+  for (let grew = true; grew;) {
+    grew = false;
+    const rowHas = (rr: number) => {
+      for (let cc = g.c0 - 1; cc <= g.c1 + 1; cc++) if (has(rr, cc)) return true;
+      return false;
+    };
+    const colHas = (cc: number) => {
+      for (let rr = g.r0 - 1; rr <= g.r1 + 1; rr++) if (has(rr, cc)) return true;
+      return false;
+    };
+    if (g.r0 > 0 && rowHas(g.r0 - 1)) (g.r0--, (grew = true));
+    if (g.r1 < MAX_ROWS - 1 && rowHas(g.r1 + 1)) (g.r1++, (grew = true));
+    if (g.c0 > 0 && colHas(g.c0 - 1)) (g.c0--, (grew = true));
+    if (g.c1 < MAX_COLS - 1 && colHas(g.c1 + 1)) (g.c1++, (grew = true));
+  }
+  return g;
+}
+
+function checkMerges(s: Sheet, range: CellRange) {
+  const hit = (s.병합 ?? []).some((m) => {
+    const rg = parseRange(m);
+    return rg && rangesOverlap(rg, range);
+  });
+  if (hit) throw new CommandError("병합한 칸이 든 범위는 정렬하지 못함 — 병합을 먼저 풂");
+}
+
+// ── 정렬 ───────────────────────────────────────────────────────────────────
+
+/** 정렬 명령 만들기 — 값은 엔진 계산값으로 견줌 · 걸러진 행은 제자리 */
+export function sortCommand(
+  book: Workbook,
+  engine: CalcEngine,
+  sheetId: string,
+  range: CellRange,
+  opts: SortOptions,
+): Command {
+  const s = sheetOf(book, sheetId);
+  const data: CellRange = { ...range, r0: range.r0 + (opts.머리 ? 1 : 0) };
+  if (data.r0 > data.r1) throw new CommandError("정렬할 행이 없음");
+  if (!opts.기준.length) throw new CommandError("정렬 기준이 없음");
+  for (const k of opts.기준)
+    if (k.열 < range.c0 || k.열 > range.c1) throw new CommandError("정렬 기준 열이 범위 밖");
+  checkMerges(s, data);
+  const rows: number[] = [];
+  for (let r = data.r0; r <= data.r1; r++) if (!filtered(s, r)) rows.push(r);
+  const keys = new Map(rows.map((r) => [r, opts.기준.map((k) => engine.value(sheetId, r, k.열))]));
+  const sorted = [...rows].sort((a, b) => {
+    const va = keys.get(a)!;
+    const vb = keys.get(b)!;
+    for (let i = 0; i < opts.기준.length; i++) {
+      const d = sortCompare(va[i], vb[i], opts.기준[i].내림, opts.대소문자);
+      if (d) return d;
+    }
+    return a - b;
+  });
+  const order: number[] = [];
+  let next = 0;
+  for (let r = data.r0; r <= data.r1; r++) order.push(filtered(s, r) ? r : sorted[next++]);
+  return { 종류: "정렬", 시트: sheetId, 범위: data, 차례: order };
+}
+
+export function applySort(book: Workbook, cmd: Of<"정렬">): CommandEffect {
+  const s = sheetOf(book, cmd.시트);
+  const { r0, r1, c0, c1 } = cmd.범위;
+  const n = r1 - r0 + 1;
+  if (
+    cmd.차례.length !== n ||
+    new Set(cmd.차례).size !== n ||
+    cmd.차례.some((r) => r < r0 || r > r1)
+  )
+    throw new CommandError("정렬 차례가 범위와 안 맞음");
+  checkMerges(s, cmd.범위);
+  const before = clone(s);
+  const take = <T>(table: Record<string, T> | undefined) => {
+    const out = new Map<string, T>();
+    for (let r = r0; r <= r1; r++)
+      for (let c = c0; c <= c1; c++) {
+        const a1 = toA1(r, c);
+        if (table && a1 in table) {
+          out.set(a1, table[a1]);
+          delete table[a1];
+        }
+      }
+    return out;
+  };
+  const cells = take<Cell>(s.칸);
+  const notes = take<string>(s.comments);
+  cmd.차례.forEach((src, i) => {
+    const to = r0 + i;
+    for (let c = c0; c <= c1; c++) {
+      const cell = cells.get(toA1(src, c));
+      if (cell) {
+        const moved = { ...cell };
+        if (moved.식 !== undefined) moved.식 = moveFormula(moved.식, to - src, 0);
+        s.칸[toA1(to, c)] = moved;
+      }
+      const note = notes.get(toA1(src, c));
+      if (note !== undefined) (s.comments ??= {})[toA1(to, c)] = note;
+    }
+  });
+  if (s.comments && !Object.keys(s.comments).length) delete s.comments;
+  return { undo: { 종류: "시트통째", 시트: before }, cells: [], rebuild: true };
+}
+
+// ── 자동 필터 ──────────────────────────────────────────────────────────────
+
+/** 칸의 보이는 글(숫자 형식 적용) — 빈 칸 "" */
+export function displayText(
+  book: Workbook,
+  engine: CalcEngine,
+  sheetId: string,
+  r: number,
+  c: number,
+) {
+  const s = sheetOf(book, sheetId);
+  const cell = s.칸[toA1(r, c)];
+  if (!cell || (cell.값 === undefined && cell.식 === undefined)) return "";
+  const idx = cell.서식 ?? s.행?.[r + 1]?.서식 ?? s.열?.[colName(c)]?.서식 ?? s.기본?.서식 ?? 0;
+  return formatValue(engine.value(sheetId, r, c), book.서식[idx]?.형식).글;
+}
+
+/** 필터 단추 목록 — 열의 서로 다른 보이는 글(정렬 차례 · 빈 칸 맨 뒤) · 켬 = 지금 보이는 값 */
+export function filterItems(
+  book: Workbook,
+  engine: CalcEngine,
+  sheetId: string,
+  c: number,
+): { 글: string; 켬: boolean }[] {
+  const s = sheetOf(book, sheetId);
+  const f = s.필터 && parseRange(s.필터.범위);
+  if (!f) return [];
+  const allowed = s.필터!.조건?.[colName(c)];
+  const seen = new Map<string, Scalar>();
+  for (let r = f.r0 + 1; r <= f.r1; r++) {
+    const text = displayText(book, engine, sheetId, r, c);
+    if (!seen.has(text)) seen.set(text, text === "" ? null : engine.value(sheetId, r, c));
+  }
+  return [...seen]
+    .sort((a, b) => sortCompare(a[1], b[1]) || (a[0] < b[0] ? -1 : a[0] > b[0] ? 1 : 0))
+    .map(([글]) => ({ 글, 켬: !allowed || allowed.includes(글) }));
+}
+
+/** 필터 명령 — 범위 · 조건으로 걸러질 행을 셈(null = 필터 끔) */
+export function filterCommand(
+  book: Workbook,
+  engine: CalcEngine,
+  sheetId: string,
+  filter: AutoFilter | null,
+): Command {
+  if (!filter) return { 종류: "필터", 시트: sheetId, 필터: null, 걸러짐: [] };
+  const f = parseRange(filter.범위);
+  if (!f) throw new CommandError(`필터 범위 틀림: ${filter.범위}`);
+  const hidden: number[] = [];
+  const conds = Object.entries(filter.조건 ?? {}).map(
+    ([col, list]) => [colIndex(col), new Set(list)] as const,
+  );
+  for (let r = f.r0 + 1; r <= f.r1; r++)
+    if (conds.some(([c, ok]) => !ok.has(displayText(book, engine, sheetId, r, c)))) hidden.push(r);
+  return { 종류: "필터", 시트: sheetId, 필터: filter, 걸러짐: hidden };
+}
+
+export function applyFilter(book: Workbook, cmd: Of<"필터">): CommandEffect {
+  const s = sheetOf(book, cmd.시트);
+  const before = clone(s);
+  if (cmd.필터) s.필터 = clone(cmd.필터);
+  else delete s.필터;
+  const table = (s.행 ??= {});
+  for (const [k, info] of Object.entries(table)) {
+    delete info.걸러짐;
+    if (!Object.keys(info).length) delete table[k];
+  }
+  for (const r of cmd.걸러짐) (table[String(r + 1)] ??= {}).걸러짐 = true;
+  if (!Object.keys(table).length) delete s.행;
+  return { undo: { 종류: "시트통째", 시트: before }, cells: [], rebuild: false };
+}
+
+/** 행열 넣기 · 지우기 때 필터 범위 · 조건 열 따라감(머리 행 · 끝 열까지 지우면 필터 없어짐) */
+export function shiftFilter(s: Sheet, rows: boolean, insert: boolean, at: number, n: number) {
+  const f = s.필터 && parseRange(s.필터.범위);
+  if (!s.필터 || !f) return;
+  const sp = rows
+    ? shiftSpan(f.r0, f.r1, insert, at, n, MAX_ROWS)
+    : shiftSpan(f.c0, f.c1, insert, at, n, MAX_COLS);
+  const headGone = rows && !insert && f.r0 >= at && f.r0 < at + n;
+  if (!sp || headGone) {
+    delete s.필터;
+    return;
+  }
+  const next = rows ? { ...f, r0: sp[0], r1: sp[1] } : { ...f, c0: sp[0], c1: sp[1] };
+  s.필터.범위 = rangeToA1(next);
+  if (rows || !s.필터.조건) return;
+  const conds: Record<string, string[]> = {};
+  for (const [col, list] of Object.entries(s.필터.조건)) {
+    const c = shiftSpan(colIndex(col), colIndex(col), insert, at, n, MAX_COLS);
+    if (c) conds[colName(c[0])] = list;
+  }
+  s.필터.조건 = conds;
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_types.ts b/A00_Common/spreadsheet/spreadsheet_types.ts
index 0612f6b1..4767bcc6 100644
--- a/A00_Common/spreadsheet/spreadsheet_types.ts
+++ b/A00_Common/spreadsheet/spreadsheet_types.ts
@@ -14,7 +14,7 @@
  * · xlsx 가져오기 · 내보내기 · 인쇄 · PDF 는 만들지 않음(단추도 없음). xlsx 는 시험(F)만 읽음.
  *
  * ── 크기 예산 (vite build · 압축(gzip) 뒤 · M02 산출근거를 열 때만 받는 조각) ──────
- *   엔진 A+B 22 KB · 화면 C+D+E 28 KB · css 4 KB · 합 54 KB 안쪽. 재는 곳 = F(빌드 조각 크기 시험).
+ *   엔진 A+B 32 KB · 화면 C+D+E 28 KB · css 4 KB · 합 64 KB 안쪽. 재는 곳 = F(빌드 조각 크기 시험).
  *
  * ── 파일 · 주인 · 예산 줄 수 ─────────────────────────────────────────────────
  *   0  spreadsheet_types.ts           이 계약(타입)                                   ~450
@@ -27,6 +27,11 @@
  *   A  spreadsheet_refshift.ts        넣기 · 지우기 · 옮기기 · 복사 때 참조 옮김        ~300
  *   A  spreadsheet_commands.ts        명령 적용 → 되돌림 짝 · 빈 통합문서             ~550
  *   A  spreadsheet_history.ts         되돌리기 · 다시                                  ~100
+ *   A  spreadsheet_commands_sheet.ts  시트 명령(더하기 · 지우기 · 이름 · 옮기기 · 통째)    ~100
+ *   A  spreadsheet_sortfilter.ts      정렬 · 자동 필터 엔진(차례 · 걸러짐 셈 · 적용)      ~300
+ *   A  spreadsheet_sort_dialog.ts     정렬 대화 상자 · 빠른 정렬(화면)                   ~250
+ *   A  spreadsheet_filter.ts          자동 필터 단추 · 값 목록 창(화면)                  ~300
+ *   A  spreadsheet_sortfilter.css                                                     ~150
  *   A  spreadsheet_recalc.ts          통합문서 한 벌 풀이(서버 Node · 시험 진입)        ~80
  *   B  spreadsheet_functions.ts       함수 표(이름 → 뜻) · 인자 수 검사                 ~120
  *   B  spreadsheet_functions_math.ts  수학 · 삼각 · 끝수                               ~400
@@ -125,6 +130,14 @@ export interface RowInfo {
   높이?: number;
   숨김?: boolean;
   서식?: number;
+  /** 자동 필터가 숨긴 행 — 사용자 `숨김` 과 따로(필터 풀면 보임) · 격자는 숨김처럼 그림. */
+  걸러짐?: boolean;
+}
+
+/** 자동 필터 — `범위` 첫 행 = 머리(단추) · `조건` = 열 글자 → 보일 값(보이는 글 · 빈 칸은 ""). 조건 없는 열은 다 보임. */
+export interface AutoFilter {
+  범위: string;
+  조건?: Record<string, string[]>;
 }
 
 export interface Sheet {
@@ -147,6 +160,8 @@ export interface Sheet {
   기본?: { 서식?: number; 열폭?: number; 행높이?: number };
   /** 칸 메모 — A1 열쇠 → 메모 글. 행열 넣기 · 지우기 · 잘라 붙이기 때 칸과 같이 옮김(지운 칸 메모는 지움). */
   comments?: Record<string, string>;
+  /** 자동 필터(시트에 하나) */
+  필터?: AutoFilter;
 }
 
 /** 새 시트 기본값 — 값은 사용자 협의로 확정(9_엑셀검토 8장 · 임의 확정 금지). 없으면 A 의 임시값. */
@@ -353,6 +368,11 @@ export type Command =
   | { 종류: "시트옮기기"; 시트: string; 자리: number }
   /** 되돌림 짝 전용 — 시트 통째 바꿔 넣기(행열 지우기 되돌림 등) */
   | { 종류: "시트통째"; 시트: Sheet; 서식?: CellStyle[] }
+  /** 정렬 — `차례[i]` = 범위 r0+i 자리에 올 원래 행(범위 열만 옮김 · 식은 복사처럼 상대 참조만 옮김).
+   * 차례는 `sortCommand`(값 비교는 엔진)가 만듦 — 다시 하기가 같은 결과가 되게 명령에 박음. */
+  | { 종류: "정렬"; 시트: string; 범위: CellRange; 차례: number[] }
+  /** 자동 필터 켜기 · 조건 바꾸기 · 끄기(null) — `걸러짐` = 숨길 행(`filterCommand` 가 값으로 셈) */
+  | { 종류: "필터"; 시트: string; 필터: AutoFilter | null; 걸러짐: number[] }
   /** 여러 명령 = 되돌리기 한 번 */
   | { 종류: "묶음"; 명령: Command[] };
 
diff --git a/resources/tester/spreadsheet/harness_sortfilter.html b/resources/tester/spreadsheet/harness_sortfilter.html
new file mode 100644
index 00000000..7eaf596d
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html lang="ko">
+  <head>
+    <meta charset="utf-8" />
+    <title>정렬 · 필터 시험 틀</title>
+    <link rel="stylesheet" href="../../../ui_template/ui_template_theme.css" />
+    <style>
+      body { margin: 0; font-family: sans-serif; }
+      #bar { margin: 8px; display: flex; gap: 8px; }
+      #host { height: 520px; margin: 8px; border: 1px solid #999; }
+    </style>
+  </head>
+  <body>
+    <div id="bar">
+      <button id="btn-sort">정렬…</button>
+      <button id="btn-asc">오름차순</button>
+      <button id="btn-desc">내림차순</button>
+      <button id="btn-filter">필터</button>
+      <button id="btn-undo">되돌리기</button>
+    </div>
+    <div id="host"></div>
+    <script>
+      window.ssErrors = [];
+      window.addEventListener("error", (e) => window.ssErrors.push(String(e.error?.stack || e.message)));
+    </script>
+    <script src="../../../tmp/spreadsheet_sortfilter/harness.js"></script>
+  </body>
+</html>
diff --git a/resources/tester/spreadsheet/harness_sortfilter.ts b/resources/tester/spreadsheet/harness_sortfilter.ts
new file mode 100644
index 00000000..6703ba73
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter.ts
@@ -0,0 +1,85 @@
+/* 정렬 · 자동 필터 화면 시험 틀 입구 — 진짜 부품(createSpreadsheet)에 정렬 대화 상자 · 필터 단추를 얹음.
+ * sub7 잇기 전이라 `parts.mountTabs` 를 감싸 문맥(ctx)을 꺼내고, grid.render 뒤 filter.refresh 를 부름.
+ * 번들: node harness_sortfilter_bundle.cjs → tmp/spreadsheet_sortfilter/harness.js (git 밖) */
+import { createSpreadsheet, parts } from "../../../A00_Common/spreadsheet/spreadsheet";
+import {
+  openSortDialog,
+  sortSelection,
+} from "../../../A00_Common/spreadsheet/spreadsheet_sort_dialog";
+import { attachFilter, toggleFilter } from "../../../A00_Common/spreadsheet/spreadsheet_filter";
+import type { SpreadsheetContext } from "../../../A00_Common/spreadsheet/spreadsheet_view_types";
+import type { Workbook } from "../../../A00_Common/spreadsheet/spreadsheet_types";
+
+const w = window as unknown as Record<string, unknown>;
+let ctx: SpreadsheetContext | null = null;
+const origTabs = parts.mountTabs;
+parts.mountTabs = (c: SpreadsheetContext) => {
+  ctx = c;
+  return origTabs(c);
+};
+
+const rows: [string, string, number][] = [
+  ["터파기", "토사", 12.5],
+  ["되메우기", "토사", 3],
+  ["잡석", "", 7.25],
+  ["터파기", "풍화암", 4],
+  ["콘크리트", "18-21-8", 9.9],
+  ["되메우기", "토사", 0],
+  ["거푸집", "합판 3회", 21],
+  ["터파기", "토사", 1.5],
+];
+const 칸: Workbook["시트"][number]["칸"] = {
+  A1: { 값: "공종" },
+  B1: { 값: "규격" },
+  C1: { 값: "수량" },
+  D1: { 값: "두 배" },
+  C12: { 식: "SUM(C2:C9)" },
+  B12: { 값: "합계" },
+};
+rows.forEach(([a, b, c], i) => {
+  const r = i + 2;
+  칸[`A${r}`] = { 값: a };
+  if (b) 칸[`B${r}`] = { 값: b };
+  칸[`C${r}`] = { 값: c, 서식: 1 };
+  칸[`D${r}`] = { 식: `C${r}*2`, 서식: 1 };
+});
+const book: Workbook = {
+  종류: "통합문서",
+  판: 1,
+  열: "harness",
+  서식: [{}, { 형식: "0.00" }],
+  시트: [{ id: "s1", 이름: "정렬필터", 칸, 행: { 11: { 숨김: true } } }],
+  활성: "s1",
+};
+
+const host = document.getElementById("host")!;
+w.ss = createSpreadsheet(host, book, {
+  onChange: () => (w.ssChanges = Number(w.ssChanges ?? 0) + 1),
+});
+const c = ctx as unknown as SpreadsheetContext;
+const filter = attachFilter(c);
+const render = c.grid.render.bind(c.grid);
+c.grid.render = () => {
+  render();
+  filter.refresh();
+};
+w.ssCtx = c;
+w.ssFilter = filter;
+w.ssSortDialog = () => openSortDialog(c);
+w.ssSortQuick = (desc: boolean) => sortSelection(c, desc);
+w.ssToggleFilter = () => toggleFilter(c);
+/** 열 값(보이는 칸 글) — 판정용 */
+w.ssCol = (letter: string, r0: number, r1: number) => {
+  const out: string[] = [];
+  for (let r = r0; r <= r1; r++)
+    out.push(document.querySelector(`[data-a1="${letter}${r}"]`)?.textContent ?? "");
+  return out;
+};
+for (const [id, run] of [
+  ["btn-sort", () => openSortDialog(c)],
+  ["btn-asc", () => sortSelection(c, false)],
+  ["btn-desc", () => sortSelection(c, true)],
+  ["btn-filter", () => toggleFilter(c)],
+  ["btn-undo", () => c.undo()],
+] as const)
+  document.getElementById(id)!.addEventListener("click", run);
diff --git a/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs b/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs
new file mode 100644
index 00000000..632917a1
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs
@@ -0,0 +1,29 @@
+/* 정렬 · 필터 시험 틀 번들 — rolldown(이미 설치) 한 파일 · css 는 <style> 로 넣음 · @ui 별칭.
+ * node harness_sortfilter_bundle.cjs → tmp/spreadsheet_sortfilter/harness.js (git 밖) */
+const fs = require("fs");
+const path = require("path");
+const ROOT = path.join(__dirname, "..", "..", "..");
+const { build } = require(path.join(ROOT, "config", "node_modules", "rolldown"));
+
+build({
+  input: path.join(__dirname, "harness_sortfilter.ts"),
+  resolve: { alias: { "@ui": path.join(ROOT, "ui_template") } },
+  plugins: [
+    {
+      name: "css-inline",
+      load(id) {
+        if (!id.endsWith(".css")) return null;
+        const css = JSON.stringify(fs.readFileSync(id, "utf8"));
+        const code = `const s = document.createElement("style"); s.textContent = ${css}; document.head.append(s);`;
+        return { code, moduleType: "js" };
+      },
+    },
+  ],
+  output: { file: path.join(ROOT, "tmp", "spreadsheet_sortfilter", "harness.js"), format: "iife" },
+}).then(
+  () => console.log("ok"),
+  (e) => {
+    console.error(e.message);
+    process.exit(1);
+  },
+);
diff --git a/resources/tester/spreadsheet/helper_spreadsheet_d.cjs b/resources/tester/spreadsheet/helper_spreadsheet_d.cjs
index cc09a435..a0461a2d 100644
--- a/resources/tester/spreadsheet/helper_spreadsheet_d.cjs
+++ b/resources/tester/spreadsheet/helper_spreadsheet_d.cjs
@@ -93,6 +93,10 @@ const out = {
   highlights: ed
     .refHighlights("=A1+B2:C3*A1+치수!B1", "s1", (n) => (n === "치수" ? "s2" : null))
     .map((h) => `${h.시트}:${addr.rangeToA1(h.범위)}:${h.색번호}`),
+  // 함수 자동 완성 · 인자 도움말 자리
+  hint: ["=su", "=A1+ro", "=A1", "=ROUND(B5,", "=SUM(A1,MAX(1,2),", '=IF(A1=",",', "abc"].map((t) =>
+    ed.formulaHint(t),
+  ),
   // 채우기 끌기 목표
   fill: [[{ r: 9, c: 1 }], [{ r: 2, c: 6 }], [{ r: 3, c: 1 }], [{ r: 2, c: 1 }]].map(([p]) => {
     const t = mouse.fillTarget({ r0: 1, c0: 1, r1: 3, c1: 2 }, p);
diff --git a/resources/tester/spreadsheet/helper_spreadsheet_engine.cjs b/resources/tester/spreadsheet/helper_spreadsheet_engine.cjs
index 0747dd8a..144b6699 100644
--- a/resources/tester/spreadsheet/helper_spreadsheet_engine.cjs
+++ b/resources/tester/spreadsheet/helper_spreadsheet_engine.cjs
@@ -99,7 +99,7 @@ const H = load("spreadsheet_history");
 const RC = load("spreadsheet_recalc");
 
 // 무게 시험(`bench_spreadsheet_engine.cjs`)이 같은 적재 · 가짜 함수를 씀 — 불려 올 때는 시험을 안 돌림
-module.exports = { A, C, E, F, G };
+module.exports = { A, C, E, F, G, load };
 if (require.main !== module) return;
 
 const results = {};
diff --git a/resources/tester/spreadsheet/helper_spreadsheet_sortfilter.cjs b/resources/tester/spreadsheet/helper_spreadsheet_sortfilter.cjs
new file mode 100644
index 00000000..5b4c9520
--- /dev/null
+++ b/resources/tester/spreadsheet/helper_spreadsheet_sortfilter.cjs
@@ -0,0 +1,206 @@
+/* 정렬 · 자동 필터 엔진 시험 헬퍼 — 엑셀 규칙표를 묶음마다 돌려 틀린 것 목록을 JSON 으로 냄.
+ * 적재 · 가짜 함수는 `helper_spreadsheet_engine.cjs` 것을 씀.
+ */
+const { A, C, E, F, G, load } = require("./helper_spreadsheet_engine.cjs");
+const SF = load("spreadsheet_sortfilter");
+
+const results = {};
+let group = "";
+const eq = (label, got, want) => {
+  const g = JSON.stringify(got);
+  const w = JSON.stringify(want);
+  if (g !== w) results[group].push(`${label}: got ${g} want ${w}`);
+};
+const section = (name, fn) => {
+  group = name;
+  results[name] = [];
+  try {
+    fn();
+  } catch (e) {
+    results[name].push(`예외: ${e && e.stack ? e.stack : e}`);
+  }
+};
+const canon = (v) =>
+  Array.isArray(v)
+    ? v.map(canon)
+    : v && typeof v === "object"
+      ? Object.fromEntries(Object.keys(v).sort().map((k) => [k, canon(v[k])]))
+      : v;
+
+function book(cells, extra = {}) {
+  const 칸 = {};
+  for (const [k, v] of Object.entries(cells))
+    칸[k] = typeof v === "string" && v.startsWith("=") ? { 식: v.slice(1) } : { 값: v };
+  return { 종류: "통합문서", 판: 1, 열: "t", 서식: [{}], 시트: [{ id: "s1", 이름: "본", 칸, ...extra }] };
+}
+const show = (v) => (v === null ? null : E.isError(v) ? v.error : E.isFrac(v) ? F.fracToString(v) : v);
+const col = (b, letter, r0, r1) => {
+  const e = G.createCalcEngine(b);
+  const out = [];
+  for (let r = r0; r <= r1; r++) out.push(show(e.value("s1", r - 1, A.colIndex(letter))));
+  return out;
+};
+const R = A.parseRange;
+
+/** 정렬 → 명령 적용 → 되돌림이 처음과 같은지 · 다시 하면 같은 결과인지 */
+function sortAndCheck(label, b, range, opts) {
+  const e = G.createCalcEngine(b);
+  const cmd = SF.sortCommand(b, e, "s1", R(range), opts);
+  const before = JSON.stringify(canon(b.시트));
+  const fx = C.applyCommand(b, cmd);
+  const after = JSON.stringify(canon(b.시트));
+  C.applyCommand(b, fx.undo);
+  eq(`${label} 되돌림`, JSON.stringify(canon(b.시트)) === before, true);
+  C.applyCommand(b, cmd);
+  eq(`${label} 다시`, JSON.stringify(canon(b.시트)) === after, true);
+  return cmd;
+}
+
+// ── 1. 정렬 차례 ────────────────────────────────────────────────────────────
+section("sort_order", () => {
+  const mixed = () =>
+    book({
+      A1: "값",
+      B1: "번호",
+      A2: 3, B2: 1,
+      A3: "b", B3: 2,
+      A4: true, B4: 3,
+      A5: "A", B5: 4,
+      A6: 1, B6: 5,
+      B7: 6, // 빈 칸
+      A8: "=1/0", B8: 7,
+      A9: false, B9: 8,
+      A10: "a", B10: 9,
+      A11: 2, B11: 10,
+    });
+  let b = mixed();
+  sortAndCheck("오름", b, "A1:B11", { 머리: true, 기준: [{ 열: 0 }] });
+  eq("오름 = 수 < 글 < 참거짓 < 오류 < 빈 칸 · 같은 값은 원래 차례", col(b, "B", 2, 11), ["5", "10", "1", "4", "9", "2", "8", "3", "7", "6"]);
+  eq("머리 행 제자리", col(b, "A", 1, 1), ["값"]);
+  b = mixed();
+  sortAndCheck("내림", b, "A1:B11", { 머리: true, 기준: [{ 열: 0, 내림: true }] });
+  eq("내림 = 거꾸로 · 빈 칸은 그래도 맨 뒤", col(b, "B", 2, 11), ["7", "3", "8", "2", "4", "9", "1", "10", "5", "6"]);
+  b = mixed();
+  sortAndCheck("대소문자", b, "A1:B11", { 머리: true, 기준: [{ 열: 0 }], 대소문자: true });
+  eq("대소문자 가리면 소문자 먼저", col(b, "B", 5, 6), ["9", "4"]);
+  // 여러 기준 · 머리 없음
+  b = book({ A1: "나", B1: 1, A2: "가", B2: 2, A3: "나", B3: 3, A4: "가", B4: 1, A5: 10, B5: 9, A6: 9, B6: 9 });
+  sortAndCheck("여러 기준", b, "A1:B6", { 머리: false, 기준: [{ 열: 0 }, { 열: 1, 내림: true }] });
+  eq("첫 기준 오름 · 둘째 내림", [col(b, "A", 1, 6), col(b, "B", 1, 6)], [
+    ["9", "10", "가", "가", "나", "나"],
+    ["9", "9", "2", "1", "3", "1"],
+  ]);
+  eq("현재 영역", SF.currentRegion(mixed(), "s1", 4, 0), R("A1:B11"));
+  eq("현재 영역 빈 칸 너머는 안 감", SF.currentRegion(book({ A1: 1, A2: 2, C1: 3 }), "s1", 0, 0), R("A1:A2"));
+});
+
+// ── 2. 정렬 뒤 수식 · 서식 · 메모 (엑셀 규칙) ────────────────────────────────
+section("sort_formulas", () => {
+  const b = book(
+    {
+      A1: 3, B1: "=A1*10", C1: "=$A$1+A1",
+      A2: 1, B2: "=A2*10", C2: "=$A$1+A2",
+      A3: 2, B3: "=A3*10", C3: "=$A$1+A3",
+      E1: "=SUM(A1:A3)", E2: "=A1",
+    },
+    { comments: { A1: "셋", A3: "둘" } },
+  );
+  b.시트[0].칸.A2.서식 = 0;
+  b.서식.push({ 굵게: true });
+  b.시트[0].칸.A1.서식 = 1;
+  sortAndCheck("식 옮김", b, "A1:C3", { 머리: false, 기준: [{ 열: 0 }] });
+  const s = b.시트[0].칸;
+  eq("상대 참조는 복사처럼 · 절대는 그대로", [s.B1.식, s.B3.식, s.C1.식, s.C3.식], ["A1*10", "A3*10", "$A$1+A1", "$A$1+A3"]);
+  eq("범위 밖 식은 그대로", [s.E1.식, s.E2.식], ["SUM(A1:A3)", "A1"]);
+  eq("값", col(b, "B", 1, 3), ["10", "20", "30"]);
+  eq("E2 는 새 A1 을 봄", col(b, "E", 2, 2), ["1"]);
+  eq("서식 · 메모 따라감", [s.A3.서식, b.시트[0].comments], [1, { A2: "둘", A3: "셋" }]);
+});
+
+// ── 3. 정렬 막힘 · 걸러진 행 제자리 ─────────────────────────────────────────
+section("sort_rules", () => {
+  const b = book({ A1: 3, A2: 1, A3: 2 }, { 병합: ["B2:C2"] });
+  const e = G.createCalcEngine(b);
+  let msg = null;
+  try {
+    SF.sortCommand(b, e, "s1", R("A1:C3"), { 머리: false, 기준: [{ 열: 0 }] });
+  } catch (err) {
+    msg = err instanceof C.CommandError;
+  }
+  eq("병합 걸치면 막음", msg, true);
+  msg = null;
+  try {
+    SF.sortCommand(b, e, "s1", R("A1:A3"), { 머리: false, 기준: [{ 열: 3 }] });
+  } catch (err) {
+    msg = err instanceof C.CommandError;
+  }
+  eq("기준 열이 범위 밖", msg, true);
+  msg = null;
+  try {
+    C.applyCommand(b, { 종류: "정렬", 시트: "s1", 범위: R("A1:A3"), 차례: [0, 0, 1] });
+  } catch (err) {
+    msg = err instanceof C.CommandError;
+  }
+  eq("차례가 틀리면 막음", msg, true);
+  const f = book({ A1: 5, A2: 4, A3: 3, A4: 2, A5: 1 }, { 행: { 2: { 걸러짐: true }, 4: { 걸러짐: true, 높이: 30 } } });
+  sortAndCheck("걸러진 행", f, "A1:A5", { 머리: false, 기준: [{ 열: 0 }] });
+  eq("보이는 행끼리만 · 걸러진 행 · 높이 제자리", [col(f, "A", 1, 5), f.시트[0].행], [["1", "4", "3", "2", "5"], { 2: { 걸러짐: true }, 4: { 걸러짐: true, 높이: 30 } }]);
+});
+
+// ── 4. 자동 필터 ────────────────────────────────────────────────────────────
+section("filter", () => {
+  const make = () => {
+    const b = book({
+      A1: "공종", B1: "수량",
+      A2: "터파기", B2: 1.5,
+      A3: "되메우기", B3: 0,
+      A4: "터파기", B4: 2,
+      B5: 3,
+      A6: "잡석", B6: "=B2",
+      D1: "=SUM(B2:B6)",
+    }, { 행: { 3: { 숨김: true } } });
+    b.서식.push({ 형식: "0.00" });
+    for (let r = 2; r <= 6; r++) b.시트[0].칸[`B${r}`].서식 = 1;
+    return b;
+  };
+  const b = make();
+  let e = G.createCalcEngine(b);
+  C.applyCommand(b, SF.filterCommand(b, e, "s1", { 범위: "A1:B6" }));
+  eq("켬 = 걸러짐 없음", [b.시트[0].필터, b.시트[0].행], [{ 범위: "A1:B6" }, { 3: { 숨김: true } }]);
+  eq("값 목록 · 가나다 · 빈 칸 맨 뒤", SF.filterItems(b, e, "s1", 0), [
+    { 글: "되메우기", 켬: true },
+    { 글: "잡석", 켬: true },
+    { 글: "터파기", 켬: true },
+    { 글: "", 켬: true },
+  ]);
+  eq("수 열 = 보이는 글(형식) · 수 차례", SF.filterItems(b, e, "s1", 1).map((x) => x.글), ["0.00", "1.50", "2.00", "3.00"]);
+  const on = SF.filterCommand(b, e, "s1", { 범위: "A1:B6", 조건: { A: ["터파기", ""] } });
+  eq("걸러질 행", on.걸러짐, [2, 5]);
+  const before = JSON.stringify(canon(b.시트));
+  const fx = C.applyCommand(b, on);
+  eq("걸러짐 · 사용자 숨김은 따로", b.시트[0].행, { 3: { 숨김: true, 걸러짐: true }, 6: { 걸러짐: true } });
+  eq("목록 켬 = 조건", SF.filterItems(b, e, "s1", 0).map((x) => x.켬), [false, false, true, true]);
+  eq("걸러도 값 · 합계 그대로", col(b, "D", 1, 1), ["8"]);
+  C.applyCommand(b, fx.undo);
+  eq("필터 조건 되돌림", JSON.stringify(canon(b.시트)) === before, true);
+  C.applyCommand(b, on);
+  const two = SF.filterCommand(b, e, "s1", { 범위: "A1:B6", 조건: { A: ["터파기", ""], B: ["2.00", "3.00"] } });
+  eq("두 열 조건 = 모두 맞아야", two.걸러짐, [1, 2, 5]);
+  // 행 넣기 · 열 지우기 때 필터 따라감
+  C.applyCommand(b, { 종류: "행넣기", 시트: "s1", at: 3, 수: 1 });
+  eq("행 넣기 = 범위 늘어남 · 걸러짐 밀림", [b.시트[0].필터.범위, b.시트[0].행["7"]], ["A1:B7", { 걸러짐: true }]);
+  C.applyCommand(b, { 종류: "열지우기", 시트: "s1", at: 0, 수: 1 });
+  eq("조건 열을 지우면 조건 빠짐", b.시트[0].필터, { 범위: "A1:A7", 조건: {} });
+  C.applyCommand(b, { 종류: "행지우기", 시트: "s1", at: 0, 수: 1 });
+  eq("머리 행 지우면 필터 없어짐", b.시트[0].필터, undefined);
+  // 끄기 — 걸러짐 풀리고 사용자 숨김은 남음
+  const c = make();
+  e = G.createCalcEngine(c);
+  C.applyCommand(c, SF.filterCommand(c, e, "s1", { 범위: "A1:B6", 조건: { A: ["잡석"] } }));
+  const off = C.applyCommand(c, SF.filterCommand(c, e, "s1", null));
+  eq("끄기", [c.시트[0].필터, c.시트[0].행], [undefined, { 3: { 숨김: true } }]);
+  C.applyCommand(c, off.undo);
+  eq("끄기 되돌림", c.시트[0].행["2"], { 걸러짐: true });
+});
+
+process.stdout.write(JSON.stringify(results));
diff --git a/resources/tester/spreadsheet/spreadsheet_b_test_entry.ts b/resources/tester/spreadsheet/spreadsheet_b_test_entry.ts
index 92972b24..129b4d08 100644
--- a/resources/tester/spreadsheet/spreadsheet_b_test_entry.ts
+++ b/resources/tester/spreadsheet/spreadsheet_b_test_entry.ts
@@ -111,6 +111,9 @@ fracEq(
 fracEq("ROUND", call("ROUND", n("1.155"), n(2)), "1.16"); // 분수 반올림 — 부동소수 함정 없음
 fracEq("ROUNDUP", call("ROUNDUP", n("1.001"), n(2)), "1.01");
 fracEq("ROUNDDOWN", call("ROUNDDOWN", n("1.999"), n(2)), "1.99");
+fracEq("ROUND 음수 자릿수(십의 자리)", call("ROUND", n(1234), n(-2)), "1200");
+fracEq("ROUNDUP 음수 자릿수", call("ROUNDUP", n(1234), n(-2)), "1300");
+fracEq("ROUNDDOWN 음수 자릿수", call("ROUNDDOWN", n(1234), n(-2)), "1200");
 fracEq("INT 양수", call("INT", n("8.9")), "8");
 fracEq("INT 음수(floor)", call("INT", n("-8.9")), "-9");
 fracEq("TRUNC", call("TRUNC", n("8.9")), "8");
@@ -142,6 +145,29 @@ errEq("AVERAGE 빈 값 없음", call("AVERAGE", range(1, 1, [["x"]])), "#DIV/0!"
 errEq("MOD 0 나눔", call("MOD", n(1), n(0)), "#DIV/0!");
 errEq("CEILING 부호 다름", call("CEILING", n(-2), n(1)), "#NUM!");
 
+// 2단계 첫 묶음(2026-09-27)
+fracEq("MROUND", call("MROUND", n(10), n(3)), "9");
+fracEq("MROUND 소수", call("MROUND", n("1.3"), n("0.2")), "1.4");
+errEq("MROUND 부호 다름", call("MROUND", n(10), n(-3)), "#NUM!");
+fracEq("ODD 양수", call("ODD", n("1.5")), "3");
+fracEq("ODD 짝수 정수", call("ODD", n(2)), "3");
+fracEq("ODD 0", call("ODD", n(0)), "1");
+fracEq("ODD 음수", call("ODD", n(-2)), "-3");
+fracEq("EVEN 양수", call("EVEN", n("1.5")), "2");
+fracEq("EVEN 홀수 정수", call("EVEN", n(3)), "4");
+fracEq("EVEN 음수", call("EVEN", n(-1)), "-2");
+fracEq("LOG 밑 지정", call("LOG", n(8), n(2)), "3");
+fracEq("LOG10", call("LOG10", n(100)), "2");
+fracEq("LN(1) = 0", call("LN", n(1)), "0");
+ok(
+  "EXP(1) ≈ e",
+  (() => {
+    const v = call("EXP", n(1));
+    return isFrac(v) && fracToString(v).startsWith("2.71828182845905");
+  })(),
+);
+errEq("LOG10 0 이하", call("LOG10", n(0)), "#NUM!");
+
 // ── 논리 · 글 ────────────────────────────────────────────────────────────
 
 fracEq("IF 참 값", call("IF", bl(true), n(1), n(2)), "1");
@@ -161,6 +187,22 @@ textEq("RIGHT", call("RIGHT", txt("가나다"), n(2)), "나다");
 textEq("MID", call("MID", txt("가나다라"), n(2), n(2)), "나다");
 fracEq("VALUE", call("VALUE", txt("1,234.5")), "1234.5");
 errEq("VALUE 실패", call("VALUE", txt("가나다")), "#VALUE!");
+textEq(
+  "TEXTJOIN 빈칸 건너뜀",
+  call("TEXTJOIN", txt("-"), bl(true), txt("a"), txt(""), txt("b")),
+  "a-b",
+);
+textEq("TRIM", call("TRIM", txt("  가   나  ")), "가 나");
+textEq("UPPER", call("UPPER", txt("abc")), "ABC");
+textEq("LOWER", call("LOWER", txt("ABC")), "abc");
+textEq("SUBSTITUTE 전부", call("SUBSTITUTE", txt("abcabc"), txt("a"), txt("X")), "XbcXbc");
+textEq("SUBSTITUTE 몇번째", call("SUBSTITUTE", txt("abcabc"), txt("a"), txt("X"), n(2)), "abcXbc");
+textEq("REPLACE", call("REPLACE", txt("abcdef"), n(2), n(3), txt("XYZ")), "aXYZef");
+fracEq("FIND", call("FIND", txt("c"), txt("abcabc")), "3");
+errEq("FIND 대소문자 가림", call("FIND", txt("C"), txt("abcabc")), "#VALUE!");
+fracEq("SEARCH 대소문자 안가림", call("SEARCH", txt("C"), txt("abcabc")), "3");
+fracEq("SEARCH 자리표시(*)", call("SEARCH", txt("a*c"), txt("xxabcyy")), "3");
+textEq("REPT", call("REPT", txt("ab"), n(3)), "ababab");
 
 // ── 찾기 ────────────────────────────────────────────────────────────────
 
@@ -207,6 +249,51 @@ fracEq(
   "40",
 );
 
+// 2단계 첫 묶음 — 여러 조건 · IFS 계열 · XLOOKUP
+const NAMES4 = range(1, 4, [["가", "나", "가", "다"]]);
+const AMOUNTS4 = range(1, 4, [[frac(10n), frac(20n), frac(30n), frac(40n)]]);
+const AMOUNTS4B = range(1, 4, [[frac(1n), frac(2n), frac(3n), frac(4n)]]);
+fracEq("SUMIFS 두 조건", call("SUMIFS", AMOUNTS4, NAMES4, txt("가"), AMOUNTS4B, txt(">1")), "30");
+fracEq("COUNTIFS 두 조건", call("COUNTIFS", NAMES4, txt("가"), AMOUNTS4B, txt(">1")), "1");
+fracEq("AVERAGEIF", call("AVERAGEIF", AMOUNTS4, txt(">15")), "30");
+fracEq("AVERAGEIFS", call("AVERAGEIFS", AMOUNTS4, NAMES4, txt("가")), "20");
+fracEq("MAXIFS", call("MAXIFS", AMOUNTS4, NAMES4, txt("가")), "30");
+fracEq("MINIFS", call("MINIFS", AMOUNTS4, NAMES4, txt("가")), "10");
+fracEq("IFS 처음 참", call("IFS", bl(false), n(1), bl(true), n(2), bl(true), n(3)), "2");
+textEq(
+  "SWITCH 맞음",
+  call("SWITCH", n(2), n(1), txt("one"), n(2), txt("two"), n(3), txt("three")),
+  "two",
+);
+textEq("SWITCH 기본값", call("SWITCH", n(9), n(1), txt("one"), txt("default")), "default");
+errEq("SWITCH 안 맞음(기본값 없음)", call("SWITCH", n(9), n(1), txt("one")), "#N/A");
+const XNAMES = range(1, 3, [["가", "나", "다"]]);
+const XAMOUNTS = range(1, 3, [[frac(10n), frac(20n), frac(30n)]]);
+fracEq("XLOOKUP", call("XLOOKUP", txt("나"), XNAMES, XAMOUNTS), "20");
+textEq("XLOOKUP 못찾음 대체값", call("XLOOKUP", txt("없음"), XNAMES, XAMOUNTS, txt("no")), "no");
+errEq("XLOOKUP 못찾음 기본", call("XLOOKUP", txt("없음"), XNAMES, XAMOUNTS), "#N/A");
+
+// 정보 · 날짜
+boolEq("ISNUMBER 참", call("ISNUMBER", n(5)) as boolean, true);
+boolEq("ISNUMBER 거짓(글)", call("ISNUMBER", txt("x")) as boolean, false);
+boolEq("ISTEXT 참", call("ISTEXT", txt("x")) as boolean, true);
+boolEq("ISBLANK 참", call("ISBLANK", lit(null)) as boolean, true);
+boolEq("ISBLANK 거짓(0)", call("ISBLANK", n(0)) as boolean, false);
+boolEq("ISERROR 참", call("ISERROR", lit({ error: "#DIV/0!" } as ErrorValue)) as boolean, true);
+boolEq("ISERROR 거짓", call("ISERROR", n(1)) as boolean, false);
+errEq("NA", call("NA"), "#N/A");
+{
+  const serial = call("DATE", n(2026), n(1), n(15));
+  fracEq("YEAR(DATE(2026,1,15))", call("YEAR", lit(serial)), "2026");
+  fracEq("MONTH(DATE(2026,1,15))", call("MONTH", lit(serial)), "1");
+  fracEq("DAY(DATE(2026,1,15))", call("DAY", lit(serial)), "15");
+}
+{
+  const todaySerial = call("TODAY");
+  const wantYear = new Date().getUTCFullYear();
+  fracEq("YEAR(TODAY()) = 지금 연도", call("YEAR", lit(todaySerial)), String(wantYear));
+}
+
 // ── 숫자 형식 ────────────────────────────────────────────────────────────
 
 function fmt(value: Scalar, code: string): string {
@@ -249,6 +336,16 @@ ok(
   fmt(frac(-150n, 100n), "0.00_);[Red](0.00)") === "(1.50)",
   fmt(frac(-150n, 100n), "0.00_);[Red](0.00)"),
 );
+
+// 분수 형식
+ok("분수 가분수(자동 분모)", fmt(frac(1n, 2n), "0/0") === "1/2", fmt(frac(1n, 2n), "0/0"));
+ok(
+  "분수 정수부+분자(자동 분모)",
+  fmt(frac(5n, 2n), "# ?/?") === "2 1/2",
+  fmt(frac(5n, 2n), "# ?/?"),
+);
+ok("분수 분모 고정", fmt(frac(4n, 10n), "# ?/8") === " 3/8", fmt(frac(4n, 10n), "# ?/8"));
+ok("분수 정확히 나눠떨어짐(정수만)", fmt(frac(3n), "# ?/?") === "3", fmt(frac(3n), "# ?/?"));
 ok("글자 형식 @", fmt("abc", "@@") === "abcabc", fmt("abc", "@@"));
 ok(
   "일반(General)",
diff --git a/resources/tester/spreadsheet/spreadsheet_d_fakes.cjs b/resources/tester/spreadsheet/spreadsheet_d_fakes.cjs
index 9dbb9582..6f164b3e 100644
--- a/resources/tester/spreadsheet/spreadsheet_d_fakes.cjs
+++ b/resources/tester/spreadsheet/spreadsheet_d_fakes.cjs
@@ -438,7 +438,11 @@ function createGrid(ctx) {
       const r0 = Math.floor(root.scrollTop / H);
       return { r0, r1: r0 + Math.floor(root.clientHeight / H) - 2, c0: 0, c1: COLS - 1 };
     },
-    editorSlot: (r, c) => ({ layer: content, box: cellBox(r, c) }),
+    // C 와 같은 꼴 — box 는 격자 뿌리 기준(스크롤 뺌)
+    editorSlot: (r, c) => {
+      const b = cellBox(r, c);
+      return { layer: content, box: { ...b, x: b.x - root.scrollLeft, y: b.y - root.scrollTop } };
+    },
     destroy: () => root.remove(),
   };
 }
diff --git a/resources/tester/spreadsheet/spreadsheet_size.mjs b/resources/tester/spreadsheet/spreadsheet_size.mjs
index 57eff220..618be74c 100644
--- a/resources/tester/spreadsheet/spreadsheet_size.mjs
+++ b/resources/tester/spreadsheet/spreadsheet_size.mjs
@@ -1,6 +1,10 @@
-// 스프레드시트 크기 재기 — vite 로 줄여 묶은 뒤 gzip 크기(바이트). `test_spreadsheet_size.py` 가 부름.
-// node spreadsheet_size.mjs <저장소 뿌리>  →  {"engine": {js, css}, "total": {js, css}}
-// 앱 번들에 이미 있는 `@ui/ui_template_elements*` 는 빼고 잼(스프레드시트가 새로 더하는 몫만).
+// 스프레드시트 크기 재기 — gzip 크기(바이트). `test_spreadsheet_size.py` 가 부름.
+// node spreadsheet_size.mjs <저장소 뿌리>  →  {"engine": {js, css}, "total": {js, css}, "static": [...]}
+// engine = 엔진 파일만 줄여 묶은 크기 · total = 실제 앱 빌드에서 스프레드시트를 열 때 받는 조각
+// (스프레드시트 조각 + 끌어오는 공용 조각 + css · 첫 화면 `index.html` 조각은 뺌).
+// static = 스프레드시트 조각을 정적으로 끌어오는 조각(비어야 함 — 늦게만 받음).
+import fs from "node:fs";
+import os from "node:os";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
 import { gzipSync } from "node:zlib";
@@ -25,7 +29,7 @@ const ENGINE = [
   "spreadsheet_fill",
 ];
 
-async function measure(entries) {
+async function engineSize() {
   const out = await build({
     configFile: false,
     logLevel: "silent",
@@ -35,22 +39,60 @@ async function measure(entries) {
       write: false,
       minify: true,
       target: "es2022",
-      cssCodeSplit: false,
-      lib: { entry: entries, formats: ["es"] },
-      rollupOptions: { external: [/ui_template_elements/] },
+      lib: { entry: ENGINE.map((name) => path.join(dir, `${name}.ts`)), formats: ["es"] },
     },
   });
-  const outputs = (Array.isArray(out) ? out : [out]).flatMap((o) => o.output);
-  const size = { js: 0, css: 0 };
-  for (const o of outputs) {
-    const body = o.type === "chunk" ? o.code : o.source;
-    const gz = gzipSync(typeof body === "string" ? body : Buffer.from(body)).length;
-    if (o.fileName.endsWith(".css")) size.css += gz;
-    else if (o.fileName.endsWith(".js")) size.js += gz;
+  let js = 0;
+  for (const o of (Array.isArray(out) ? out : [out]).flatMap((o) => o.output)) {
+    if (o.type === "chunk") js += gzipSync(o.code).length;
   }
-  return size;
+  return { js, css: 0 };
 }
 
-const engine = await measure(ENGINE.map((name) => path.join(dir, `${name}.ts`)));
-const total = await measure([path.join(dir, "spreadsheet.ts")]);
-console.log(JSON.stringify({ engine, total }));
+async function appSize() {
+  const outDir = fs.mkdtempSync(path.join(os.tmpdir(), "aislo-sheet-size-"));
+  try {
+    await build({
+      configLoader: "runner",
+      configFile: path.join(root, "vite.config.ts"),
+      logLevel: "silent",
+      build: { outDir, emptyOutDir: true, manifest: true },
+    });
+    const manifest = JSON.parse(fs.readFileSync(path.join(outDir, ".vite/manifest.json"), "utf8"));
+    const key = Object.keys(manifest).find((k) => k.endsWith("spreadsheet/spreadsheet.ts"));
+    const gz = (file) => gzipSync(fs.readFileSync(path.join(outDir, file))).length;
+    // M02 가 이미 받은 조각은 새 몫이 아님 — 첫 화면 · M02 페이지 · M02 표(ui_template_sheet 등)
+    // 의 정적 import 사슬. 산출근거 카드는 집계표를 연 뒤에만 열림.
+    const first = new Set();
+    const mark = (k) => {
+      if (first.has(k)) return;
+      first.add(k);
+      for (const i of manifest[k].imports ?? []) mark(i);
+    };
+    const page = Object.keys(manifest).find((k) => k.endsWith("M02_MasterTemplete_UI_Page.ts"));
+    mark("index.html");
+    mark(page);
+    for (const d of manifest[page].dynamicImports ?? []) if (d !== key) mark(d);
+    const size = { js: 0, css: 0 };
+    const seen = new Set();
+    const walk = (k) => {
+      if (seen.has(k) || first.has(k)) return;
+      seen.add(k);
+      const e = manifest[k];
+      size.js += gz(e.file);
+      for (const c of e.css ?? []) size.css += gz(c);
+      for (const i of e.imports ?? []) walk(i); // 그 밖 공용 조각은 셈(넉넉히)
+    };
+    walk(key);
+    const statics = Object.entries(manifest)
+      .filter(([, v]) => (v.imports ?? []).includes(key))
+      .map(([k]) => k);
+    return { total: size, static: statics };
+  } finally {
+    fs.rmSync(outDir, { recursive: true, force: true });
+  }
+}
+
+const engine = await engineSize();
+const { total, static: statics } = await appSize();
+console.log(JSON.stringify({ engine, total, static: statics }));
diff --git a/resources/tester/spreadsheet/test_spreadsheet_d_input.py b/resources/tester/spreadsheet/test_spreadsheet_d_input.py
index c4a5f38d..6b8a4af9 100644
--- a/resources/tester/spreadsheet/test_spreadsheet_d_input.py
+++ b/resources/tester/spreadsheet/test_spreadsheet_d_input.py
@@ -81,3 +81,15 @@ def test_fill_target(r):
         ["B2:B4", "C2:C4"],
         ["B2:C3", "B4:C4"],
     ]
+
+
+def test_formula_hint(r):
+    assert r["hint"] == [
+        {"prefix": "su"},
+        {"prefix": "ro"},
+        None,
+        {"func": "ROUND", "arg": 1},
+        {"func": "SUM", "arg": 2},
+        {"func": "IF", "arg": 1},
+        None,
+    ]
diff --git a/resources/tester/spreadsheet/test_spreadsheet_size.py b/resources/tester/spreadsheet/test_spreadsheet_size.py
index 5fad6bd2..926a202d 100644
--- a/resources/tester/spreadsheet/test_spreadsheet_size.py
+++ b/resources/tester/spreadsheet/test_spreadsheet_size.py
@@ -1,7 +1,8 @@
 """F — 스프레드시트 크기 예산 · M02 만 늦게 불러옴(계약 `spreadsheet_types.ts` 머리).
 
-예산(압축 gzip 뒤) — 엔진 A+B 22 KB · 화면 C+D+E 28 KB · css 4 KB · 합 54 KB.
-엔진은 파일마다 따로 묶어 더하므로 실제보다 조금 크게 잼(넘치면 넘친 것).
+예산(압축 gzip 뒤) — 엔진 A+B 32 KB · 화면 C+D+E 28 KB · css 4 KB · 합 64 KB.
+엔진 = 엔진 파일만 따로 묶은 크기 · 합 = 실제 앱 빌드에서 스프레드시트를 열 때 받는 조각
+(공용 조각까지 넉넉히 셈) · 화면 = 합 − 엔진.
 """
 
 import json
@@ -15,7 +16,7 @@ import pytest
 ROOT = Path(__file__).resolve().parents[3]
 SCRIPT = Path(__file__).with_name("spreadsheet_size.mjs")
 KB = 1024
-BUDGET = {"engine": 22 * KB, "view": 28 * KB, "css": 4 * KB, "total": 54 * KB}
+BUDGET = {"engine": 32 * KB, "view": 28 * KB, "css": 4 * KB, "total": 64 * KB}
 
 pytestmark = pytest.mark.skipif(shutil.which("node") is None, reason="node 가 없음")
 
@@ -36,6 +37,7 @@ def test_크기_예산():
     print(
         f"gzip — 엔진 {engine} · 화면 {view} · css {total['css']} · 합 {total['js'] + total['css']}"
     )
+    assert size["static"] == [], f"스프레드시트 조각을 정적으로 끌어옴 — {size['static']}"
     assert engine <= BUDGET["engine"], f"엔진 {engine} B > {BUDGET['engine']}"
     assert view <= BUDGET["view"], f"화면 {view} B > {BUDGET['view']}"
     assert total["css"] <= BUDGET["css"], f"css {total['css']} B > {BUDGET['css']}"
diff --git a/resources/tester/spreadsheet/test_spreadsheet_sortfilter.py b/resources/tester/spreadsheet/test_spreadsheet_sortfilter.py
new file mode 100644
index 00000000..3d82328d
--- /dev/null
+++ b/resources/tester/spreadsheet/test_spreadsheet_sortfilter.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+"""산출근거 스프레드시트 정렬 · 자동 필터 엔진 — 엑셀 규칙표.
+
+정렬 차례(수 < 글 < 참거짓 < 오류 · 빈 칸 늘 맨 뒤 · 같은 값 원래 차례 · 여러 기준 · 대소문자) ·
+정렬 뒤 식(복사처럼 상대 참조만 · 범위 밖 식은 그대로) · 서식 · 메모 · 걸러진 행 제자리 · 병합 막음 ·
+필터 값 목록(보이는 글 · 빈 칸 맨 뒤) · 걸러짐(사용자 숨김과 따로) · 행열 넣기 · 지우기 때 필터 따라감 · 되돌리기.
+화면(대화 상자 · 필터 단추)은 harness_sortfilter.html 을 ORCA 로.
+"""
+
+import json
+import os
+import subprocess
+
+import pytest
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+GROUPS = ["sort_order", "sort_formulas", "sort_rules", "filter"]
+
+
+@pytest.fixture(scope="module")
+def results():
+    proc = subprocess.run(
+        ["node", os.path.join(HERE, "helper_spreadsheet_sortfilter.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        timeout=120,
+    )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+@pytest.mark.parametrize("group", GROUPS)
+def test_묶음(results, group):
+    assert group in results
+    assert results[group] == []