custom 툴발 적용

frontend/src/App.css

@@ -1103,6 +1103,34 @@ html.theme-blue {
   animation: flyout-in-right 0.1s ease;
 }
 
+/* Custom / Custom1 — body 포털, 차트 레이어 위·항목 색상 통일 */
+.tv-side-flyout--custom-overlay {
+  z-index: 10050;
+  background: var(--bg2);
+  isolation: isolate;
+}
+.tv-side-flyout--custom-overlay .tv-side-flyout-item {
+  color: var(--text2);
+  background: transparent;
+}
+.tv-side-flyout--custom-overlay .tv-side-flyout-item:hover,
+.tv-side-flyout--custom-overlay .tv-side-flyout-item:focus-visible {
+  background: var(--bg3);
+  color: var(--text);
+}
+.tv-side-flyout--custom-overlay .tv-side-flyout-item.active {
+  background: rgba(122, 162, 247, 0.15);
+  color: var(--accent);
+}
+.tv-side-flyout--custom-overlay .tv-side-flyout-item.active:hover {
+  background: rgba(122, 162, 247, 0.22);
+  color: var(--accent);
+}
+.tv-side-flyout--custom-overlay .tv-side-flyout-icon,
+.tv-side-flyout--custom-overlay .tv-side-flyout-title {
+  color: inherit;
+}
+
 @keyframes flyout-in-right {
   from { opacity: 0; transform: translateX(calc(-100% + 6px)); }
   to   { opacity: 1; transform: translateX(-100%); }
@@ -2561,6 +2589,74 @@ html.theme-blue {
   border-color: rgba(122, 162, 247, 0.65);
   background: rgba(122, 162, 247, 0.22);
 }
+.chart-right-toolbar-btn--custom1 {
+  position: relative;
+}
+.chart-right-toolbar-custom1-badge {
+  position: absolute;
+  right: 2px;
+  bottom: 2px;
+  font-size: 8px;
+  font-weight: 700;
+  line-height: 1;
+  color: var(--text-muted, #787b86);
+  pointer-events: none;
+}
+.chart-right-toolbar-btn--custom1.active .chart-right-toolbar-custom1-badge {
+  color: var(--accent, #2962ff);
+}
+.chart-right-toolbar-btn--custom.active,
+.chart-right-toolbar-btn--custom1.active {
+  color: var(--accent);
+  border-color: rgba(122, 162, 247, 0.65);
+  background: rgba(122, 162, 247, 0.22);
+}
+
+/* Custom 오버레이 설정 모달 (보조지표 설정 ibsm 스타일) */
+.ccos-dialog {
+  max-height: 88vh;
+}
+.ccos-hint {
+  margin: 0;
+  padding: 8px 14px 0;
+}
+.ccos-body {
+  padding-top: 8px;
+}
+.ccos-item-grid {
+  display: grid;
+  gap: 8px 12px;
+  align-items: center;
+}
+.ccos-item-grid--2 {
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+.ccos-item-grid--3 {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+}
+.ccos-grid-item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-height: 28px;
+  padding: 4px 6px;
+  border-radius: 4px;
+  cursor: pointer;
+  user-select: none;
+}
+.ccos-grid-item:hover {
+  background: rgba(255, 255, 255, 0.04);
+}
+.ccos-grid-toggle {
+  flex-shrink: 0;
+}
+.ccos-grid-label {
+  font-size: 12px;
+  color: var(--text);
+  line-height: 1.3;
+  flex: 1;
+  min-width: 0;
+}
 
 /* ── PaneLegend 드래그 핸들 ─────────────────────────────────────────── */
 .pane-legend-item {

frontend/src/App.tsx

@@ -54,6 +54,15 @@ import {
   DEFAULT_CHART_OVERLAY_VISIBILITY,
   listChartOverlayToggleItems,
 } from './utils/chartOverlayVisibility';
+import {
+  type ChartCustomOverlaySelection,
+  type ChartCustomOverlaySlotId,
+  createDefaultChartCustomOverlaySelection,
+  isCustomOverlaySlotActive,
+  resolveActiveCustomOverlaySlot,
+  syncChartManagerCustomOverlaysByActiveSlot,
+} from './utils/chartCustomOverlay';
+import ChartCustomOverlaySettingsModal from './components/ChartCustomOverlaySettingsModal';
 import { isUpbitMarket, UPBIT_MARKETS } from './utils/upbitApi';
 import { getFavorites, saveFavorites, initFavoritesFromDb, initHoldingsFromDb, FAVORITES_CHANGED_EVENT } from './utils/marketStorage';
 import { useChartRealtimeData, type WsStatus } from './hooks/useChartRealtimeData';
@@ -1455,6 +1464,73 @@ function App() {
     [overlayVisibility],
   );
 
+  const [customOverlaySelection, setCustomOverlaySelection] = useState<ChartCustomOverlaySelection>(
+    () => createDefaultChartCustomOverlaySelection(),
+  );
+  const [custom1OverlaySelection, setCustom1OverlaySelection] = useState<ChartCustomOverlaySelection>(
+    () => createDefaultChartCustomOverlaySelection(),
+  );
+  const [activeCustomOverlaySlot, setActiveCustomOverlaySlot] = useState<ChartCustomOverlaySlotId | null>(null);
+  const [customOverlaySettingsSlot, setCustomOverlaySettingsSlot] = useState<ChartCustomOverlaySlotId | null>(null);
+  const customOverlayActive = isCustomOverlaySlotActive(activeCustomOverlaySlot, 'custom');
+  const custom1OverlayActive = isCustomOverlaySlotActive(activeCustomOverlaySlot, 'custom1');
+
+  const syncCustomOverlaysToManager = useCallback((mgr: import('./utils/ChartManager').ChartManager) => {
+    syncChartManagerCustomOverlaysByActiveSlot(
+      mgr,
+      activeCustomOverlaySlot,
+      customOverlaySelection,
+      custom1OverlaySelection,
+    );
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleCustomOverlayActiveChange = useCallback((active: boolean) => {
+    const nextSlot = resolveActiveCustomOverlaySlot('custom', active, activeCustomOverlaySlot);
+    setActiveCustomOverlaySlot(nextSlot);
+    const mgr = managerRef.current;
+    if (mgr) {
+      syncChartManagerCustomOverlaysByActiveSlot(
+        mgr,
+        nextSlot,
+        customOverlaySelection,
+        custom1OverlaySelection,
+      );
+    }
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleCustom1OverlayActiveChange = useCallback((active: boolean) => {
+    const nextSlot = resolveActiveCustomOverlaySlot('custom1', active, activeCustomOverlaySlot);
+    setActiveCustomOverlaySlot(nextSlot);
+    const mgr = managerRef.current;
+    if (mgr) {
+      syncChartManagerCustomOverlaysByActiveSlot(
+        mgr,
+        nextSlot,
+        customOverlaySelection,
+        custom1OverlaySelection,
+      );
+    }
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleSaveCustomOverlaySelection = useCallback((
+    slot: ChartCustomOverlaySlotId,
+    selection: ChartCustomOverlaySelection,
+  ) => {
+    const nextCustomSel = slot === 'custom' ? selection : customOverlaySelection;
+    const nextCustom1Sel = slot === 'custom1' ? selection : custom1OverlaySelection;
+    if (slot === 'custom') setCustomOverlaySelection(selection);
+    else setCustom1OverlaySelection(selection);
+    setCustomOverlaySettingsSlot(null);
+    const mgr = managerRef.current;
+    if (!mgr) return;
+    syncChartManagerCustomOverlaysByActiveSlot(
+      mgr,
+      activeCustomOverlaySlot,
+      nextCustomSel,
+      nextCustom1Sel,
+    );
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
   const handleToggleCandleOverlay = useCallback((key: ChartOverlayToggleKey) => {
     setOverlayVisibility(prev => {
       const next = { ...prev, [key]: !prev[key] };
@@ -2451,7 +2527,9 @@ function App() {
             onCrosshair={setLegend}
             onTradeOrderRequest={applyTradeFill}
             onDataLoaded={() => {
-              managerRef.current?.setChartOverlayVisibility(overlayVisibilityRef.current);
+              const mgr = managerRef.current;
+              mgr?.setChartOverlayVisibility(overlayVisibilityRef.current);
+              if (mgr) syncCustomOverlaysToManager(mgr);
               syncBacktestMarkersRef.current();
             }}
             onCandlesReady={handleCandlesReady}
@@ -2474,6 +2552,7 @@ function App() {
               mgr.setPaneSeparatorOptions(chartPaneSeparator);
               mgr.setDisplayTimezone(displayTimezone, timeframe, chartTimeFormat);
               mgr.setChartOverlayVisibility(overlayVisibilityRef.current);
+              syncCustomOverlaysToManager(mgr);
               syncBacktestMarkersRef.current();
               // 왼쪽 스크롤 감지 → 과거 데이터 추가 로드
               mgr.subscribeVisibleLogicalRange(r => {
@@ -2520,8 +2599,30 @@ function App() {
             paneSeparatorOptions={chartPaneSeparator}
             candleOverlayToggles={candleOverlayToggles}
             onToggleCandleOverlay={handleToggleCandleOverlay}
+            customOverlayActive={customOverlayActive}
+            onCustomOverlayActiveChange={handleCustomOverlayActiveChange}
+            onOpenCustomOverlaySettings={() => setCustomOverlaySettingsSlot('custom')}
+            custom1OverlayActive={custom1OverlayActive}
+            onCustom1OverlayActiveChange={handleCustom1OverlayActiveChange}
+            onOpenCustom1OverlaySettings={() => setCustomOverlaySettingsSlot('custom1')}
             showHoverToolbar={chartHoverToolbarVisible}
           />
+          {customOverlaySettingsSlot === 'custom' && (
+            <ChartCustomOverlaySettingsModal
+              title="Custom 표시 설정"
+              selection={customOverlaySelection}
+              onSave={sel => handleSaveCustomOverlaySelection('custom', sel)}
+              onCancel={() => setCustomOverlaySettingsSlot(null)}
+            />
+          )}
+          {customOverlaySettingsSlot === 'custom1' && (
+            <ChartCustomOverlaySettingsModal
+              title="Custom1 표시 설정"
+              selection={custom1OverlaySelection}
+              onSave={sel => handleSaveCustomOverlaySelection('custom1', sel)}
+              onCancel={() => setCustomOverlaySettingsSlot(null)}
+            />
+          )}
           {isSingleLoadingMore && (
             <div className="chart-history-loading">
               <div className="loading-spinner" style={{ width: 14, height: 14 }} />

frontend/src/components/ChartCustomOverlaySettingsModal.tsx

@@ -0,0 +1,267 @@
+import React, { useState, useCallback, useRef, useEffect } from 'react';
+import {
+  type ChartCustomOverlaySelection,
+  type CustomOverlaySectionId,
+  cloneChartCustomOverlaySelection,
+  smaMaLabel,
+  BB_CUSTOM_LABELS,
+  ICHIMOKU_CUSTOM_ROWS,
+  isCustomSectionAllSelected,
+  setCustomSectionAllSelected,
+} from '../utils/chartCustomOverlay';
+import { SMA_MA_COUNT, smaPlotId } from '../utils/smaConfig';
+import { useDraggablePanel } from '../hooks/useDraggablePanel';
+
+interface ChartCustomOverlaySettingsModalProps {
+  title?: string;
+  selection: ChartCustomOverlaySelection;
+  onSave: (selection: ChartCustomOverlaySelection) => void;
+  onCancel: () => void;
+}
+
+const SECTION_META: Array<{
+  id: CustomOverlaySectionId;
+  ko: string;
+  en: string;
+  cols: 2 | 3;
+}> = [
+  { id: 'sma', ko: '이동평균선', en: 'Simple Moving Average (SMA)', cols: 3 },
+  { id: 'bollinger', ko: '볼린저 밴드', en: 'Bollinger Bands', cols: 2 },
+  { id: 'ichimoku', ko: '일목균형표', en: 'Ichimoku Cloud', cols: 3 },
+  { id: 'candle', ko: '캔들차트', en: 'Candlestick', cols: 2 },
+];
+
+const ALL_SECTIONS = new Set<CustomOverlaySectionId>(SECTION_META.map(s => s.id));
+
+const GridToggle: React.FC<{
+  label: string;
+  checked: boolean;
+  onChange: (v: boolean) => void;
+}> = ({ label, checked, onChange }) => (
+  <div className="ccos-grid-item">
+    <label className="ibsm-toggle ccos-grid-toggle" onClick={e => e.stopPropagation()}>
+      <input
+        type="checkbox"
+        checked={checked}
+        onChange={e => onChange(e.target.checked)}
+      />
+      <span className="ism-toggle-slider" />
+    </label>
+    <span className="ccos-grid-label">{label}</span>
+  </div>
+);
+
+const ChartCustomOverlaySettingsModal: React.FC<ChartCustomOverlaySettingsModalProps> = ({
+  title = 'Custom 표시 설정',
+  selection,
+  onSave,
+  onCancel,
+}) => {
+  const draftRef = useRef(cloneChartCustomOverlaySelection(selection));
+  const [, bump] = useState(0);
+  const refresh = useCallback(() => bump(n => n + 1), []);
+  const [expanded, setExpanded] = useState<Set<CustomOverlaySectionId>>(
+    () => new Set(ALL_SECTIONS),
+  );
+
+  const {
+    panelRef,
+    dragging,
+    onHeaderPointerDown,
+    headerTouchStyle,
+    panelStyle,
+    headerCursor,
+  } = useDraggablePanel({ centerOnMount: true });
+
+  useEffect(() => {
+    draftRef.current = cloneChartCustomOverlaySelection(selection);
+    setExpanded(new Set(ALL_SECTIONS));
+    refresh();
+  }, [selection, refresh]);
+
+  const draft = draftRef.current;
+
+  const patch = useCallback((patchFn: (d: ChartCustomOverlaySelection) => void) => {
+    patchFn(draftRef.current);
+    refresh();
+  }, [refresh]);
+
+  const toggleSectionExpand = useCallback((id: CustomOverlaySectionId) => {
+    setExpanded(prev => {
+      const next = new Set(prev);
+      if (next.has(id)) next.delete(id);
+      else next.add(id);
+      return next;
+    });
+  }, []);
+
+  const toggleSectionAll = useCallback((id: CustomOverlaySectionId) => {
+    patch(d => {
+      const allOn = isCustomSectionAllSelected(d, id);
+      setCustomSectionAllSelected(d, id, !allOn);
+    });
+  }, [patch]);
+
+  const renderSectionItems = (sectionId: CustomOverlaySectionId) => {
+    switch (sectionId) {
+      case 'sma':
+        return Array.from({ length: SMA_MA_COUNT }, (_, i) => {
+          const pid = smaPlotId(i);
+          return (
+            <GridToggle
+              key={pid}
+              label={smaMaLabel(i)}
+              checked={draft.smaPlots[pid] !== false}
+              onChange={v => patch(d => { d.smaPlots[pid] = v; })}
+            />
+          );
+        });
+      case 'bollinger':
+        return (
+          <>
+            <GridToggle
+              label={BB_CUSTOM_LABELS.plot0}
+              checked={draft.bollinger.basis}
+              onChange={v => patch(d => { d.bollinger.basis = v; })}
+            />
+            <GridToggle
+              label={BB_CUSTOM_LABELS.plot1}
+              checked={draft.bollinger.upper}
+              onChange={v => patch(d => { d.bollinger.upper = v; })}
+            />
+            <GridToggle
+              label={BB_CUSTOM_LABELS.plot2}
+              checked={draft.bollinger.lower}
+              onChange={v => patch(d => { d.bollinger.lower = v; })}
+            />
+            <GridToggle
+              label="백그라운드 그리기"
+              checked={draft.bollinger.background}
+              onChange={v => patch(d => { d.bollinger.background = v; })}
+            />
+          </>
+        );
+      case 'ichimoku':
+        return ICHIMOKU_CUSTOM_ROWS.map(row => (
+          <GridToggle
+            key={row.key}
+            label={row.label}
+            checked={draft.ichimoku[row.key]}
+            onChange={v => patch(d => { d.ichimoku[row.key] = v; })}
+          />
+        ));
+      case 'candle':
+        return (
+          <GridToggle
+            label="캔들차트"
+            checked={draft.candle}
+            onChange={v => patch(d => { d.candle = v; })}
+          />
+        );
+      default:
+        return null;
+    }
+  };
+
+  return (
+    <div
+      className="ibsm-overlay"
+      onMouseDown={e => { if (e.target === e.currentTarget) onCancel(); }}
+    >
+      <div
+        ref={panelRef}
+        className="ibsm-dialog ibsm-dialog-wide ccos-dialog"
+        onMouseDown={e => e.stopPropagation()}
+        style={{
+          ...panelStyle,
+          zIndex: 5002,
+          cursor: dragging ? 'grabbing' : undefined,
+        }}
+      >
+        <div
+          className="gc-popup-header ibsm-header"
+          onPointerDown={onHeaderPointerDown}
+          style={{ cursor: headerCursor, ...headerTouchStyle }}
+        >
+          <span className="gc-popup-title ibsm-header-title">{title}</span>
+          <div className="ibsm-header-actions">
+            <button type="button" className="gc-popup-close ibsm-icon-btn" onClick={onCancel} title="닫기">
+              ✕
+            </button>
+          </div>
+        </div>
+
+        <p className="ibsm-hint ccos-hint">
+          Custom <strong>적용</strong> 시 아래에서 켠 항목만 차트에 표시됩니다. 각 지표 설정의 on/off와는 별개이며,
+          지표 우측 스위치는 해당 지표의 모든 항목을 한 번에 선택·해제합니다.
+        </p>
+
+        <div className="ibsm-body ccos-body">
+          {SECTION_META.map(meta => {
+            const isExpanded = expanded.has(meta.id);
+            const allOn = isCustomSectionAllSelected(draft, meta.id);
+            return (
+              <div
+                key={meta.id}
+                className={`ibsm-card ibsm-main-row${allOn ? ' ibsm-main-row--active' : ''}${isExpanded ? ' ibsm-card-expanded' : ''}`}
+              >
+                <div className="ibsm-card-main ibsm-main-row-head">
+                  <div className="ibsm-main-row-info">
+                    <span className="ibsm-main-row-ko">{meta.ko}</span>
+                    <span className="ibsm-main-row-en">{meta.en}</span>
+                  </div>
+                  <div className="ibsm-main-row-badges">
+                    <span className={allOn ? 'ibsm-main-badge ibsm-main-badge--on' : 'ibsm-main-badge'}>
+                      {allOn ? '전체 선택' : '일부 선택'}
+                    </span>
+                  </div>
+                  <label
+                    className="ibsm-toggle"
+                    title={allOn ? '전체 해제' : '전체 선택'}
+                    onClick={e => e.stopPropagation()}
+                  >
+                    <input
+                      type="checkbox"
+                      checked={allOn}
+                      onChange={() => toggleSectionAll(meta.id)}
+                    />
+                    <span className="ism-toggle-slider" />
+                  </label>
+                  <button
+                    type="button"
+                    className="ibsm-expand"
+                    onClick={() => toggleSectionExpand(meta.id)}
+                    aria-expanded={isExpanded}
+                    title={isExpanded ? '접기' : '펼치기'}
+                  >
+                    {isExpanded ? '▲' : '▼'}
+                  </button>
+                </div>
+                {isExpanded && (
+                  <div className={`ibsm-card-expand ccos-item-grid ccos-item-grid--${meta.cols}`}>
+                    {renderSectionItems(meta.id)}
+                  </div>
+                )}
+              </div>
+            );
+          })}
+        </div>
+
+        <div className="ibsm-footer">
+          <button type="button" className="ism-btn-cancel" onClick={onCancel}>
+            취소
+          </button>
+          <button
+            type="button"
+            className="ism-btn-ok"
+            onClick={() => onSave(cloneChartCustomOverlaySelection(draftRef.current))}
+          >
+            적용
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default ChartCustomOverlaySettingsModal;

frontend/src/components/ChartRightToolbar.tsx

@@ -3,6 +3,7 @@
  * pane 하단: 드래그 핸들 + 펼침메뉴(분리·복사·전체보기·종료)
  */
 import React, { useState, useEffect, useCallback, useRef } from 'react';
+import { createPortal } from 'react-dom';
 import type { IndicatorConfig } from '../types';
 import { ChartManager } from '../utils/ChartManager';
 import { getPaneHostId } from '../utils/indicatorPaneMerge';
@@ -35,6 +36,13 @@ export interface ChartRightToolbarProps {
   onToggleHidden?: (id: string) => void;
   /** 지표명 툴바 — 설정 모달 */
   onSettings?: (id: string) => void;
+  /** Custom / Custom1 오버레이 — 적용 여부 (동시 적용 불가, 설정은 슬롯별 분리) */
+  customOverlayActive?: boolean;
+  onCustomOverlayActiveChange?: (active: boolean) => void;
+  onOpenCustomOverlaySettings?: () => void;
+  custom1OverlayActive?: boolean;
+  onCustom1OverlayActiveChange?: (active: boolean) => void;
+  onOpenCustom1OverlaySettings?: () => void;
 }
 
 const BTN_SIZE = 32;
@@ -159,6 +167,24 @@ const IconEye = ({ hidden }: { hidden?: boolean }) => hidden ? (
   </svg>
 );
 
+const CUSTOM_MENU_ID = '__custom_overlay__';
+const CUSTOM1_MENU_ID = '__custom1_overlay__';
+
+const IconCustom = () => (
+  <svg width="14" height="14" viewBox="0 0 14 14" fill="none"
+    stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
+    <path d="M2 4h10M2 7h10M2 10h6"/>
+    <circle cx="10.5" cy="10" r="1.2" fill="currentColor" stroke="none"/>
+  </svg>
+);
+
+const IconCheck = () => (
+  <svg width="14" height="14" viewBox="0 0 14 14" fill="none"
+    stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <polyline points="2,7.5 5.5,11 12,3"/>
+  </svg>
+);
+
 const IconGear = () => (
   <svg width="14" height="14" viewBox="0 0 14 14" fill="none" stroke="currentColor" strokeWidth="1.4">
     <circle cx="7" cy="7" r="2.3"/>
@@ -166,6 +192,62 @@ const IconGear = () => (
   </svg>
 );
 
+const CustomOverlayFlyoutMenu: React.FC<{
+  title: string;
+  flyoutPos: { top: number; left: number };
+  overlayActive: boolean;
+  onToggleActive: () => void;
+  onOpenSettings: () => void;
+  onCancelClose: () => void;
+  onScheduleClose: () => void;
+  onCloseFlyout: () => void;
+}> = ({
+  title,
+  flyoutPos,
+  overlayActive,
+  onToggleActive,
+  onOpenSettings,
+  onCancelClose,
+  onScheduleClose,
+  onCloseFlyout,
+}) => createPortal(
+  <div
+    className="tv-side-flyout tv-side-flyout--right-anchor tv-side-flyout--custom-overlay"
+    style={{ top: flyoutPos.top, left: flyoutPos.left }}
+    onMouseEnter={onCancelClose}
+    onMouseLeave={onScheduleClose}
+  >
+    <div className="tv-side-flyout-header">{title}</div>
+    <button
+      type="button"
+      className={`tv-side-flyout-item${overlayActive ? ' active' : ''}`}
+      onClick={e => {
+        e.stopPropagation();
+        onToggleActive();
+        onCloseFlyout();
+      }}
+    >
+      <span className="tv-side-flyout-icon"><IconCheck /></span>
+      <span className="tv-side-flyout-title">
+        {overlayActive ? '미적용' : '적용'}
+      </span>
+    </button>
+    <button
+      type="button"
+      className="tv-side-flyout-item"
+      onClick={e => {
+        e.stopPropagation();
+        onOpenSettings();
+        onCloseFlyout();
+      }}
+    >
+      <span className="tv-side-flyout-icon"><IconGear /></span>
+      <span className="tv-side-flyout-title">설정</span>
+    </button>
+  </div>,
+  document.body,
+);
+
 interface MenuItemDef {
   key: string;
   title: string;
@@ -266,6 +348,12 @@ const ChartRightToolbar: React.FC<ChartRightToolbarProps> = ({
   manager, indicators, chartHeight, paused = false,
   candleOverlayToggles,
   onToggleCandleOverlay,
+  customOverlayActive = false,
+  onCustomOverlayActiveChange,
+  onOpenCustomOverlaySettings,
+  custom1OverlayActive = false,
+  onCustom1OverlayActiveChange,
+  onOpenCustom1OverlaySettings,
   onSplit, onRemove, onDuplicate,
   onExpand, onRestore, focusedId,
   onDragStart, onToggleHidden, onSettings,
@@ -341,6 +429,10 @@ const ChartRightToolbar: React.FC<ChartRightToolbarProps> = ({
 
   const candlePane = paneLayouts.find(l => l.paneIndex === 0);
   const showOverlayIcons = !!(candleOverlayToggles?.length && candlePane && onToggleCandleOverlay);
+  const showCustomBtn = !!(showOverlayIcons && onCustomOverlayActiveChange && onOpenCustomOverlaySettings);
+  const showCustom1Btn = !!(showOverlayIcons && onCustom1OverlayActiveChange && onOpenCustom1OverlaySettings);
+  const customMenuOpen = openMenuId === CUSTOM_MENU_ID;
+  const custom1MenuOpen = openMenuId === CUSTOM1_MENU_ID;
 
   const focusedLayoutId = focusedId
     ? resolveFocusedPaneLayoutId(focusedId, indicators)
@@ -395,6 +487,33 @@ const ChartRightToolbar: React.FC<ChartRightToolbarProps> = ({
                 {OVERLAY_ICONS[item.key]}
               </button>
             ))}
+            {showCustomBtn && (
+              <button
+                type="button"
+                className={`tv-side-btn tv-side-group-btn chart-right-toolbar-btn chart-right-toolbar-btn--custom${customOverlayActive ? ' active' : ''}${customMenuOpen ? ' active' : ''}`}
+                title="Custom 표시"
+                style={{ marginTop: BTN_GAP }}
+                onMouseEnter={e => openFlyout(CUSTOM_MENU_ID, e.currentTarget)}
+                onMouseLeave={scheduleClose}
+              >
+                <IconCustom />
+                <span className="tv-side-expand-arrow" />
+              </button>
+            )}
+            {showCustom1Btn && (
+              <button
+                type="button"
+                className={`tv-side-btn tv-side-group-btn chart-right-toolbar-btn chart-right-toolbar-btn--custom1${custom1OverlayActive ? ' active' : ''}${custom1MenuOpen ? ' active' : ''}`}
+                title="Custom1 표시"
+                style={{ marginTop: BTN_GAP }}
+                onMouseEnter={e => openFlyout(CUSTOM1_MENU_ID, e.currentTarget)}
+                onMouseLeave={scheduleClose}
+              >
+                <IconCustom />
+                <span className="chart-right-toolbar-custom1-badge">1</span>
+                <span className="tv-side-expand-arrow" />
+              </button>
+            )}
           </div>
         )}
 
@@ -457,7 +576,33 @@ const ChartRightToolbar: React.FC<ChartRightToolbarProps> = ({
         })}
       </div>
 
-      {openItem && openMenuId && (() => {
+      {customMenuOpen && showCustomBtn && (
+        <CustomOverlayFlyoutMenu
+          title="Custom"
+          flyoutPos={flyoutPos}
+          overlayActive={customOverlayActive}
+          onToggleActive={() => onCustomOverlayActiveChange?.(!customOverlayActive)}
+          onOpenSettings={() => onOpenCustomOverlaySettings?.()}
+          onCancelClose={cancelClose}
+          onScheduleClose={scheduleClose}
+          onCloseFlyout={closeFlyout}
+        />
+      )}
+
+      {custom1MenuOpen && showCustom1Btn && (
+        <CustomOverlayFlyoutMenu
+          title="Custom1"
+          flyoutPos={flyoutPos}
+          overlayActive={custom1OverlayActive}
+          onToggleActive={() => onCustom1OverlayActiveChange?.(!custom1OverlayActive)}
+          onOpenSettings={() => onOpenCustom1OverlaySettings?.()}
+          onCancelClose={cancelClose}
+          onScheduleClose={scheduleClose}
+          onCloseFlyout={closeFlyout}
+        />
+      )}
+
+      {openItem && openMenuId && openMenuId !== CUSTOM_MENU_ID && openMenuId !== CUSTOM1_MENU_ID && (() => {
         const menuItems = buildMenuItems(openItem, indicators, paneItems, {
           focusedId, onSplit, onDuplicate, onExpand, onRestore, onRemove,
           onToggleHidden, onSettings,

frontend/src/components/ChartSlot.tsx

@@ -51,6 +51,15 @@ import {
   DEFAULT_CHART_OVERLAY_VISIBILITY,
   listChartOverlayToggleItems,
 } from '../utils/chartOverlayVisibility';
+import {
+  type ChartCustomOverlaySelection,
+  type ChartCustomOverlaySlotId,
+  createDefaultChartCustomOverlaySelection,
+  isCustomOverlaySlotActive,
+  resolveActiveCustomOverlaySlot,
+  syncChartManagerCustomOverlaysByActiveSlot,
+} from '../utils/chartCustomOverlay';
+import ChartCustomOverlaySettingsModal from './ChartCustomOverlaySettingsModal';
 import { saveSlot } from '../utils/backendApi';
 import type {
   OHLCVBar, ChartType, Theme, Timeframe,
@@ -672,6 +681,73 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
     [overlayVisibility],
   );
 
+  const [customOverlaySelection, setCustomOverlaySelection] = useState<ChartCustomOverlaySelection>(
+    () => createDefaultChartCustomOverlaySelection(),
+  );
+  const [custom1OverlaySelection, setCustom1OverlaySelection] = useState<ChartCustomOverlaySelection>(
+    () => createDefaultChartCustomOverlaySelection(),
+  );
+  const [activeCustomOverlaySlot, setActiveCustomOverlaySlot] = useState<ChartCustomOverlaySlotId | null>(null);
+  const [customOverlaySettingsSlot, setCustomOverlaySettingsSlot] = useState<ChartCustomOverlaySlotId | null>(null);
+  const customOverlayActive = isCustomOverlaySlotActive(activeCustomOverlaySlot, 'custom');
+  const custom1OverlayActive = isCustomOverlaySlotActive(activeCustomOverlaySlot, 'custom1');
+
+  const syncCustomOverlaysToManager = useCallback((mgr: ChartManager) => {
+    syncChartManagerCustomOverlaysByActiveSlot(
+      mgr,
+      activeCustomOverlaySlot,
+      customOverlaySelection,
+      custom1OverlaySelection,
+    );
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleCustomOverlayActiveChange = useCallback((active: boolean) => {
+    const nextSlot = resolveActiveCustomOverlaySlot('custom', active, activeCustomOverlaySlot);
+    setActiveCustomOverlaySlot(nextSlot);
+    const mgr = managerRef.current;
+    if (mgr) {
+      syncChartManagerCustomOverlaysByActiveSlot(
+        mgr,
+        nextSlot,
+        customOverlaySelection,
+        custom1OverlaySelection,
+      );
+    }
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleCustom1OverlayActiveChange = useCallback((active: boolean) => {
+    const nextSlot = resolveActiveCustomOverlaySlot('custom1', active, activeCustomOverlaySlot);
+    setActiveCustomOverlaySlot(nextSlot);
+    const mgr = managerRef.current;
+    if (mgr) {
+      syncChartManagerCustomOverlaysByActiveSlot(
+        mgr,
+        nextSlot,
+        customOverlaySelection,
+        custom1OverlaySelection,
+      );
+    }
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
+  const handleSaveCustomOverlaySelection = useCallback((
+    slot: ChartCustomOverlaySlotId,
+    selection: ChartCustomOverlaySelection,
+  ) => {
+    const nextCustomSel = slot === 'custom' ? selection : customOverlaySelection;
+    const nextCustom1Sel = slot === 'custom1' ? selection : custom1OverlaySelection;
+    if (slot === 'custom') setCustomOverlaySelection(selection);
+    else setCustom1OverlaySelection(selection);
+    setCustomOverlaySettingsSlot(null);
+    const mgr = managerRef.current;
+    if (!mgr) return;
+    syncChartManagerCustomOverlaysByActiveSlot(
+      mgr,
+      activeCustomOverlaySlot,
+      nextCustomSel,
+      nextCustom1Sel,
+    );
+  }, [activeCustomOverlaySlot, customOverlaySelection, custom1OverlaySelection]);
+
   const handleToggleCandleOverlay = useCallback((key: ChartOverlayToggleKey) => {
     setOverlayVisibility(prev => {
       const next = { ...prev, [key]: !prev[key] };
@@ -937,6 +1013,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
             mgr.setVolumeVisible(chartVolumeVisible);
             if (chartPaneSeparator) mgr.setPaneSeparatorOptions(chartPaneSeparator);
             mgr.setChartOverlayVisibility(overlayVisibilityRef.current);
+            syncCustomOverlaysToManager(mgr);
             // Time sync: 가시 시간 범위 변화 구독
             mgr.subscribeVisibleTimeRange(r => {
               if (!r || isSyncingTimeRef.current) return;
@@ -962,6 +1039,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
             const mgr = managerRef.current;
             if (!mgr) return;
             mgr.setChartOverlayVisibility(overlayVisibilityRef.current);
+            syncCustomOverlaysToManager(mgr);
             if (skipSyncApplyRef.current) {
               skipSyncApplyRef.current = false;
               const fb = mgr.hasIchimoku() ? 28 : 0;
@@ -1016,8 +1094,31 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
           onFullView={onFullView ? () => onFullView(symbolRef.current) : undefined}
           candleOverlayToggles={compactMode ? undefined : candleOverlayToggles}
           onToggleCandleOverlay={compactMode ? undefined : handleToggleCandleOverlay}
+          customOverlayActive={compactMode ? undefined : customOverlayActive}
+          onCustomOverlayActiveChange={compactMode ? undefined : handleCustomOverlayActiveChange}
+          onOpenCustomOverlaySettings={compactMode ? undefined : () => setCustomOverlaySettingsSlot('custom')}
+          custom1OverlayActive={compactMode ? undefined : custom1OverlayActive}
+          onCustom1OverlayActiveChange={compactMode ? undefined : handleCustom1OverlayActiveChange}
+          onOpenCustom1OverlaySettings={compactMode ? undefined : () => setCustomOverlaySettingsSlot('custom1')}
         />
 
+        {customOverlaySettingsSlot === 'custom' && !compactMode && (
+          <ChartCustomOverlaySettingsModal
+            title="Custom 표시 설정"
+            selection={customOverlaySelection}
+            onSave={sel => handleSaveCustomOverlaySelection('custom', sel)}
+            onCancel={() => setCustomOverlaySettingsSlot(null)}
+          />
+        )}
+        {customOverlaySettingsSlot === 'custom1' && !compactMode && (
+          <ChartCustomOverlaySettingsModal
+            title="Custom1 표시 설정"
+            selection={custom1OverlaySelection}
+            onSave={sel => handleSaveCustomOverlaySelection('custom1', sel)}
+            onCancel={() => setCustomOverlaySettingsSlot(null)}
+          />
+        )}
+
         {/* 컨텍스트 툴바 */}
         {ctxToolbar && (() => {
           const cfg = ctxToolbar.entryId !== '__main__'

frontend/src/components/TradingChart.tsx

@@ -165,6 +165,12 @@ interface TradingChartProps {
   /** 캔들 오버레이(이동평균·일목·볼린저) 표시 토글 — 우측 툴바 상단 */
   candleOverlayToggles?: CandleOverlayToggleItem[];
   onToggleCandleOverlay?: (key: import('../utils/chartOverlayVisibility').ChartOverlayToggleKey) => void;
+  customOverlayActive?: boolean;
+  onCustomOverlayActiveChange?: (active: boolean) => void;
+  onOpenCustomOverlaySettings?: () => void;
+  custom1OverlayActive?: boolean;
+  onCustom1OverlayActiveChange?: (active: boolean) => void;
+  onOpenCustom1OverlaySettings?: () => void;
 }
 
 const TradingChart: React.FC<TradingChartProps> = ({
@@ -209,6 +215,12 @@ const TradingChart: React.FC<TradingChartProps> = ({
   showCandlePaneControls = true,
   candleOverlayToggles,
   onToggleCandleOverlay,
+  customOverlayActive,
+  onCustomOverlayActiveChange,
+  onOpenCustomOverlaySettings,
+  custom1OverlayActive,
+  onCustom1OverlayActiveChange,
+  onOpenCustom1OverlaySettings,
 }) => {
   const containerRef  = useRef<HTMLDivElement>(null);
   const wrapperRef    = useRef<HTMLDivElement>(null);   // 스크롤 래퍼
@@ -1609,6 +1621,12 @@ const TradingChart: React.FC<TradingChartProps> = ({
             paused={paneLegendPaused}
             candleOverlayToggles={candleOverlayToggles}
             onToggleCandleOverlay={onToggleCandleOverlay}
+            customOverlayActive={customOverlayActive}
+            onCustomOverlayActiveChange={onCustomOverlayActiveChange}
+            onOpenCustomOverlaySettings={onOpenCustomOverlaySettings}
+            custom1OverlayActive={custom1OverlayActive}
+            onCustom1OverlayActiveChange={onCustom1OverlayActiveChange}
+            onOpenCustom1OverlaySettings={onOpenCustom1OverlaySettings}
             onSplit={onSplitIndicatorPane}
             onRemove={onRemoveIndicator}
             onDuplicate={onDuplicateIndicator}

frontend/src/utils/ChartManager.ts

@@ -64,7 +64,15 @@ import {
   type ChartOverlayVisibility,
   DEFAULT_CHART_OVERLAY_VISIBILITY,
   chartOverlayKeyForType,
+  isMovingAverageOverlayType,
 } from './chartOverlayVisibility';
+import {
+  type ChartCustomOverlaySelection,
+  type ChartCustomOverlaySlotId,
+  createDefaultChartCustomOverlaySelection,
+  isCustomIchimokuCloudVisible,
+  isCustomPlotSelected,
+} from './chartCustomOverlay';
 import type { PlotDef, HLineStyle } from './indicatorRegistry';
 import { mapHistogramSeriesData, histogramBarColor } from './plotColorUtils';
 import {
@@ -171,8 +179,13 @@ function shouldShowBbBandFill(config: IndicatorConfig): boolean {
   return true;
 }
 
-function attachBbBandFill(entry: IndicatorEntry, config: IndicatorConfig): void {
+function attachBbBandFill(
-  if (!shouldShowBbBandFill(config)) {
+  entry: IndicatorEntry,
+  config: IndicatorConfig,
+  showFill?: boolean,
+): void {
+  const show = showFill ?? shouldShowBbBandFill(config);
+  if (!show) {
     detachBbBandFill(entry);
     return;
   }
@@ -240,6 +253,36 @@ export class ChartManager {
   private _chartOverlayVisibility: ChartOverlayVisibility = {
     ...DEFAULT_CHART_OVERLAY_VISIBILITY,
   };
+  private _customOverlaySlots: Record<
+    ChartCustomOverlaySlotId,
+    { active: boolean; selection: ChartCustomOverlaySelection }
+  > = {
+    custom: {
+      active: false,
+      selection: createDefaultChartCustomOverlaySelection(),
+    },
+    custom1: {
+      active: false,
+      selection: createDefaultChartCustomOverlaySelection(),
+    },
+  };
+
+  private _appliedCustomOverlaySlot(): ChartCustomOverlaySlotId | null {
+    if (this._customOverlaySlots.custom1.active) return 'custom1';
+    if (this._customOverlaySlots.custom.active) return 'custom';
+    return null;
+  }
+
+  private _isCustomOverlayApplied(): boolean {
+    return this._appliedCustomOverlaySlot() !== null;
+  }
+
+  private _getAppliedCustomOverlaySelection(): ChartCustomOverlaySelection {
+    const slot = this._appliedCustomOverlaySlot();
+    return slot
+      ? this._customOverlaySlots[slot].selection
+      : createDefaultChartCustomOverlaySelection();
+  }
 
   // ── 인디케이터 실시간 갱신 스로틀 ─────────────────────────────────────────
   private _indUpdateTimer:  ReturnType<typeof setTimeout> | null = null;
@@ -731,7 +774,10 @@ export class ChartManager {
           series.setData(mapHistogramSeriesData(filtered, plotDef));
           seriesMeta.push({ plotId: plotDef.id, isHistogram: true, color: plotDef.color });
         } else {
-          const isPlotVisible = !indicatorHidden && config.plotVisibility?.[plotDef.id] !== false;
+          const isPlotVisible = !indicatorHidden
+            && (this._isCustomOverlayApplied() && (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud')
+              ? isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotDef.id)
+              : config.plotVisibility?.[plotDef.id] !== false);
           const showPriceLabel = this.shouldShowSeriesPriceLabel(config, true, pane);
           const showSeriesTitle = pane < 2 && showPriceLabel;
           series = this.chart.addSeries(LineSeries, {
@@ -804,7 +850,7 @@ export class ChartManager {
       this.indicators.set(config.id, entry);
       this.applyIndicatorStyle(config);
       if (config.type === 'BollingerBands' && !indicatorHidden) {
-        attachBbBandFill(entry, config);
+        attachBbBandFill(entry, config, this._shouldShowBbBandFillForConfig(config));
         entry.bbFillPrimitive?.requestRefresh();
       }
     } catch (e) {
@@ -1790,13 +1836,21 @@ export class ChartManager {
 
     // bullishVisible/bearishVisible 가 둘 다 false 이면 DB 잘못된 저장값으로 간주하고
     // 기본값(표시)으로 복원한다. 하나만 false 인 경우는 사용자 의도이므로 유지.
-    const bullishVis = colors.bullishVisible !== false;
+    let bullishVis = colors.bullishVisible !== false;
-    const bearishVis = colors.bearishVisible !== false;
+    let bearishVis = colors.bearishVisible !== false;
+    if (this._isCustomOverlayApplied()) {
+      const sel = this._getAppliedCustomOverlaySelection();
+      bullishVis = isCustomIchimokuCloudVisible(sel, 'bullish');
+      bearishVis = isCustomIchimokuCloudVisible(sel, 'bearish');
+    } else {
       const effectiveBullish = (!bullishVis && !bearishVis) ? true : bullishVis;
       const effectiveBearish = (!bullishVis && !bearishVis) ? true : bearishVis;
+      bullishVis = effectiveBullish;
+      bearishVis = effectiveBearish;
+    }
 
     plugin.setColors(colors.bullishColor, colors.bearishColor);
-    plugin.setVisibility(effectiveBullish, effectiveBearish);
+    plugin.setVisibility(bullishVis, bearishVis);
 
     if (!this._isIndicatorEffectivelyVisible(config)) {
       plugin.setCloudData([]);
@@ -2379,16 +2433,87 @@ export class ChartManager {
     return config.hidden !== true;
   }
 
+  getChartCustomOverlayActive(slot: ChartCustomOverlaySlotId = 'custom'): boolean {
+    return this._customOverlaySlots[slot].active;
+  }
+
+  getChartCustomOverlaySelection(slot: ChartCustomOverlaySlotId = 'custom'): ChartCustomOverlaySelection {
+    const sel = this._customOverlaySlots[slot].selection;
+    return {
+      smaPlots: { ...sel.smaPlots },
+      bollinger: { ...sel.bollinger },
+      ichimoku: { ...sel.ichimoku },
+      candle: sel.candle,
+    };
+  }
+
+  setChartCustomOverlaySelection(
+    selection: ChartCustomOverlaySelection,
+    slot: ChartCustomOverlaySlotId = 'custom',
+  ): void {
+    this._customOverlaySlots[slot].selection = {
+      smaPlots: { ...selection.smaPlots },
+      bollinger: { ...selection.bollinger },
+      ichimoku: { ...selection.ichimoku },
+      candle: selection.candle,
+    };
+    if (this._customOverlaySlots[slot].active) {
+      this.syncChartOverlayVisibility();
+    }
+  }
+
+  /** 슬롯 적용 시 다른 슬롯은 자동 미적용 (Custom ↔ Custom1 상호 배타) */
+  setChartCustomOverlayActive(active: boolean, slot: ChartCustomOverlaySlotId = 'custom'): void {
+    if (this._customOverlaySlots[slot].active === active) return;
+    this._customOverlaySlots[slot].active = active;
+    if (active) {
+      const other: ChartCustomOverlaySlotId = slot === 'custom' ? 'custom1' : 'custom';
+      this._customOverlaySlots[other].active = false;
+    }
+    this.syncChartOverlayVisibility();
+  }
+
+  /** custom 미적용 시 지표 설정 plotVisibility, 적용 시 custom 선택만 반영 */
+  private _resolveSeriesVisible(config: IndicatorConfig, plotId: string | undefined): boolean {
+    if (!plotId || !this._isIndicatorEffectivelyVisible(config)) return false;
+    if (!this._isCustomOverlayApplied()) {
+      return config.plotVisibility?.[plotId] !== false;
+    }
+    if (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud') {
+      return isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotId);
+    }
+    if (isMovingAverageOverlayType(config.type)) {
+      return config.plotVisibility?.[plotId] !== false;
+    }
+    return config.plotVisibility?.[plotId] !== false;
+  }
+
+  private _resolveCandleVisible(): boolean {
+    if (!this._chartOverlayVisibility.candle) return false;
+    if (!this._isCustomOverlayApplied()) return true;
+    return this._getAppliedCustomOverlaySelection().candle;
+  }
+
+  private _shouldShowBbBandFillForConfig(config: IndicatorConfig): boolean {
+    if (!this._isIndicatorEffectivelyVisible(config)) return false;
+    if (!this._isCustomOverlayApplied()) {
+      const bg = resolveBbBandBackground(config.bandBackground);
+      if (!bg.visible) return false;
+      if (config.plotVisibility?.plot1 === false || config.plotVisibility?.plot2 === false) return false;
+      return true;
+    }
+    const b = this._getAppliedCustomOverlaySelection().bollinger;
+    return b.background && b.upper && b.lower;
+  }
+
   /** 오버레이·plotVisibility 반영해 시리즈 visible 만 갱신 (플롯 정의 없어도 전체 시리즈 대상) */
   private _applySeriesVisibilityToEntry(entry: IndicatorEntry): void {
     const config = entry.config;
     if (!config) return;
-    const indicatorVisible = this._isIndicatorEffectivelyVisible(config);
 
     entry.seriesList.forEach((series, i) => {
       const plotId = entry.seriesMeta[i]?.plotId;
-      const visible = indicatorVisible
+      const visible = this._resolveSeriesVisible(config, plotId);
-        && (plotId == null || config.plotVisibility?.[plotId] !== false);
       try {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         series.applyOptions({ visible } as any);
@@ -2402,7 +2527,7 @@ export class ChartManager {
       try {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         (this.mainSeries as ISeriesApi<any>).applyOptions({
-          visible: this._chartOverlayVisibility.candle,
+          visible: this._resolveCandleVisible(),
         });
       } catch { /* ok */ }
     }
@@ -2416,8 +2541,8 @@ export class ChartManager {
 
       if (entry.type === 'BollingerBands') {
         detachBbBandFill(entry);
-        if (this._isIndicatorEffectivelyVisible(config)) {
+        if (this._shouldShowBbBandFillForConfig(config)) {
-          attachBbBandFill(entry, config);
+          attachBbBandFill(entry, config, true);
           entry.bbFillPrimitive?.requestRefresh();
         }
       }
@@ -2551,15 +2676,13 @@ export class ChartManager {
     const plotDefs = config.plots ?? def?.plots ?? [];
 
     const plotById = Object.fromEntries(plotDefs.map((p: PlotDef) => [p.id, p]));
-
     const indicatorVisible = this._isIndicatorEffectivelyVisible(config);
 
     entry.seriesList.forEach((series, i) => {
       let plot: PlotDef | undefined;
       const pid = entry.seriesMeta[i]?.plotId;
       plot = (pid ? plotById[pid] : undefined) ?? plotDefs[i];
-      const visible = indicatorVisible
+      const visible = this._resolveSeriesVisible(config, pid);
-        && (pid == null || config.plotVisibility?.[pid] !== false);
       if (!plot) {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         series.applyOptions({ visible } as any);
@@ -2645,8 +2768,8 @@ export class ChartManager {
 
     if (entry.type === 'BollingerBands') {
       detachBbBandFill(entry);
-      if (indicatorVisible) {
+      if (this._shouldShowBbBandFillForConfig(config)) {
-        attachBbBandFill(entry, config);
+        attachBbBandFill(entry, config, true);
         entry.bbFillPrimitive?.requestRefresh();
       }
     }

frontend/src/utils/chartCustomOverlay.ts

@@ -0,0 +1,237 @@
+import { SMA_MA_COUNT, smaPlotId } from './smaConfig';
+
+/** Custom / Custom1 — 동일 기능, 설정만 분리 (세션만, DB 미저장) */
+export type ChartCustomOverlaySlotId = 'custom' | 'custom1';
+
+export const CHART_CUSTOM_OVERLAY_SLOTS: ChartCustomOverlaySlotId[] = ['custom', 'custom1'];
+
+/** Custom 적용 시 표시할 항목 (세션만, DB 미저장) */
+export type ChartCustomOverlaySelection = {
+  smaPlots: Record<string, boolean>;
+  bollinger: {
+    basis: boolean;
+    upper: boolean;
+    lower: boolean;
+    background: boolean;
+  };
+  ichimoku: {
+    conversion: boolean;
+    base: boolean;
+    lagging: boolean;
+    spanA: boolean;
+    spanB: boolean;
+    bullishCloud: boolean;
+    bearishCloud: boolean;
+  };
+  candle: boolean;
+};
+
+export const BB_CUSTOM_PLOT_IDS = ['plot0', 'plot1', 'plot2'] as const;
+export const BB_CUSTOM_LABELS: Record<(typeof BB_CUSTOM_PLOT_IDS)[number], string> = {
+  plot0: '중앙값',
+  plot1: '어퍼',
+  plot2: '로우어',
+};
+
+export function createDefaultChartCustomOverlaySelection(): ChartCustomOverlaySelection {
+  const smaPlots: Record<string, boolean> = {};
+  for (let i = 0; i < SMA_MA_COUNT; i++) {
+    smaPlots[smaPlotId(i)] = true;
+  }
+  return {
+    smaPlots,
+    bollinger: {
+      basis: true,
+      upper: true,
+      lower: true,
+      background: true,
+    },
+    ichimoku: {
+      conversion: true,
+      base: true,
+      lagging: true,
+      spanA: true,
+      spanB: true,
+      bullishCloud: true,
+      bearishCloud: true,
+    },
+    candle: true,
+  };
+}
+
+export function cloneChartCustomOverlaySelection(
+  sel: ChartCustomOverlaySelection,
+): ChartCustomOverlaySelection {
+  return {
+    smaPlots: { ...sel.smaPlots },
+    bollinger: { ...sel.bollinger },
+    ichimoku: { ...sel.ichimoku },
+    candle: sel.candle,
+  };
+}
+
+export function smaMaLabel(plotIndex: number): string {
+  return `MA${plotIndex + 1}`;
+}
+
+export const ICHIMOKU_CUSTOM_ROWS: Array<{
+  key: keyof ChartCustomOverlaySelection['ichimoku'];
+  plotId?: string;
+  label: string;
+}> = [
+  { key: 'conversion', plotId: 'plot0', label: '전환선' },
+  { key: 'base', plotId: 'plot1', label: '기준선' },
+  { key: 'lagging', plotId: 'plot2', label: '후행스팬' },
+  { key: 'spanA', plotId: 'plot3', label: '선행스팬1' },
+  { key: 'spanB', plotId: 'plot4', label: '선행스팬2' },
+  { key: 'bullishCloud', label: '상승 구름' },
+  { key: 'bearishCloud', label: '하락 구름' },
+];
+
+/** 지표 설정 plotVisibility 와 무관 — custom 적용 시 이 맵만 사용 */
+export function isCustomPlotSelected(
+  sel: ChartCustomOverlaySelection,
+  type: string,
+  plotId: string,
+): boolean {
+  if (type === 'SMA') {
+    return sel.smaPlots[plotId] === true;
+  }
+  if (type === 'BollingerBands') {
+    if (plotId === 'plot0') return sel.bollinger.basis;
+    if (plotId === 'plot1') return sel.bollinger.upper;
+    if (plotId === 'plot2') return sel.bollinger.lower;
+    return false;
+  }
+  if (type === 'IchimokuCloud') {
+    const row = ICHIMOKU_CUSTOM_ROWS.find(r => r.plotId === plotId);
+    if (!row) return false;
+    return sel.ichimoku[row.key] === true;
+  }
+  return true;
+}
+
+export function isCustomIchimokuCloudVisible(
+  sel: ChartCustomOverlaySelection,
+  which: 'bullish' | 'bearish',
+): boolean {
+  return which === 'bullish'
+    ? sel.ichimoku.bullishCloud
+    : sel.ichimoku.bearishCloud;
+}
+
+export type CustomOverlaySectionId = 'sma' | 'bollinger' | 'ichimoku' | 'candle';
+
+export function isCustomSectionAllSelected(
+  sel: ChartCustomOverlaySelection,
+  section: CustomOverlaySectionId,
+): boolean {
+  switch (section) {
+    case 'sma':
+      return Array.from({ length: SMA_MA_COUNT }, (_, i) =>
+        sel.smaPlots[smaPlotId(i)] !== false,
+      ).every(Boolean);
+    case 'bollinger':
+      return sel.bollinger.basis
+        && sel.bollinger.upper
+        && sel.bollinger.lower
+        && sel.bollinger.background;
+    case 'ichimoku':
+      return ICHIMOKU_CUSTOM_ROWS.every(r => sel.ichimoku[r.key]);
+    case 'candle':
+      return sel.candle;
+    default:
+      return false;
+  }
+}
+
+export function setCustomSectionAllSelected(
+  sel: ChartCustomOverlaySelection,
+  section: CustomOverlaySectionId,
+  on: boolean,
+): void {
+  switch (section) {
+    case 'sma':
+      for (let i = 0; i < SMA_MA_COUNT; i++) {
+        sel.smaPlots[smaPlotId(i)] = on;
+      }
+      break;
+    case 'bollinger':
+      sel.bollinger.basis = on;
+      sel.bollinger.upper = on;
+      sel.bollinger.lower = on;
+      sel.bollinger.background = on;
+      break;
+    case 'ichimoku':
+      for (const row of ICHIMOKU_CUSTOM_ROWS) {
+        sel.ichimoku[row.key] = on;
+      }
+      break;
+    case 'candle':
+      sel.candle = on;
+      break;
+    default:
+      break;
+  }
+}
+
+export type ChartCustomOverlaySlotState = {
+  active: boolean;
+  selection: ChartCustomOverlaySelection;
+};
+
+/** UI·Manager 공통: 한 번에 하나의 슬롯만 적용 (다른 슬롯 적용 시 기존 슬롯 자동 해제) */
+export function isCustomOverlaySlotActive(
+  activeSlot: ChartCustomOverlaySlotId | null,
+  slot: ChartCustomOverlaySlotId,
+): boolean {
+  return activeSlot === slot;
+}
+
+export function resolveActiveCustomOverlaySlot(
+  slot: ChartCustomOverlaySlotId,
+  turnOn: boolean,
+  current: ChartCustomOverlaySlotId | null,
+): ChartCustomOverlaySlotId | null {
+  if (turnOn) return slot;
+  return current === slot ? null : current;
+}
+
+type CustomOverlayManagerApi = {
+  setChartCustomOverlaySelection(
+    selection: ChartCustomOverlaySelection,
+    slot: ChartCustomOverlaySlotId,
+  ): void;
+  setChartCustomOverlayActive(active: boolean, slot: ChartCustomOverlaySlotId): void;
+};
+
+/** React → ChartManager: 두 슬롯 선택값 동기화 후 적용 중인 슬롯만 활성화 */
+export function syncChartManagerCustomOverlays(
+  mgr: CustomOverlayManagerApi,
+  custom: ChartCustomOverlaySlotState,
+  custom1: ChartCustomOverlaySlotState,
+): void {
+  mgr.setChartCustomOverlaySelection(custom.selection, 'custom');
+  mgr.setChartCustomOverlaySelection(custom1.selection, 'custom1');
+  mgr.setChartCustomOverlayActive(false, 'custom');
+  mgr.setChartCustomOverlayActive(false, 'custom1');
+  if (custom1.active) {
+    mgr.setChartCustomOverlayActive(true, 'custom1');
+  } else if (custom.active) {
+    mgr.setChartCustomOverlayActive(true, 'custom');
+  }
+}
+
+/** 적용 슬롯 하나만 — Custom 적용 중 Custom1 적용 시 Custom 자동 미적용 */
+export function syncChartManagerCustomOverlaysByActiveSlot(
+  mgr: CustomOverlayManagerApi,
+  activeSlot: ChartCustomOverlaySlotId | null,
+  customSelection: ChartCustomOverlaySelection,
+  custom1Selection: ChartCustomOverlaySelection,
+): void {
+  syncChartManagerCustomOverlays(
+    mgr,
+    { active: activeSlot === 'custom', selection: customSelection },
+    { active: activeSlot === 'custom1', selection: custom1Selection },
+  );
+}