diff --git a/frontend/src/components/InstrumentChart.tsx b/frontend/src/components/InstrumentChart.tsx
index 52228d1..ec0b2ea 100644
--- a/frontend/src/components/InstrumentChart.tsx
+++ b/frontend/src/components/InstrumentChart.tsx
@@ -38,6 +38,8 @@ interface Props {
   chartType?:   'candles' | 'line'
   onDateHover?: (date: string | null) => void
   theoryCurve?: TheoPoint[]
+  /** Called once the chart is ready with (dateToCoord, canvasPageLeft) — lets external components align with the chart's x-axis */
+  onChartReady?: (dateToCoord: (d: string) => number | null, canvasPageLeft: number) => void
 }
 
 export type { TheoPoint }
@@ -67,7 +69,7 @@ const CAT_LABELS: Record<string, string> = {
   technical:      'Tech.',
 }
 
-export default function InstrumentChart({ priceData, indicators, events = [], height = 420, chartType = 'candles', onDateHover, theoryCurve }: Props) {
+export default function InstrumentChart({ priceData, indicators, events = [], height = 420, chartType = 'candles', onDateHover, theoryCurve, onChartReady }: Props) {
   const containerRef    = useRef<HTMLDivElement>(null)
   const cleanupRef      = useRef<(() => void) | null>(null)
   const onHoverRef      = useRef(onDateHover)
@@ -208,6 +210,12 @@ export default function InstrumentChart({ priceData, indicators, events = [], he
 
       chart.timeScale().fitContent()
 
+      // Expose coordinate mapping so siblings can align with the chart x-axis
+      if (onChartReady && containerRef.current) {
+        const canvasLeft = containerRef.current.getBoundingClientRect().left
+        onChartReady((d: string) => chart.timeScale().timeToCoordinate(d as any), canvasLeft)
+      }
+
       // ── Star overlay — ★ icons positioned via chart coordinate API ────────
       const candleMap: Record<string, number> = {}
       for (const c of priceData) candleMap[c.time] = c.high
@@ -318,6 +326,7 @@ export default function InstrumentChart({ priceData, indicators, events = [], he
         chart.timeScale().unsubscribeVisibleLogicalRangeChange(renderStars)
         if (starsOverlay.parentNode) starsOverlay.parentNode.removeChild(starsOverlay)
         chart.remove()
+        onChartReady?.(null as any, 0)
       }
     })
 
@@ -326,7 +335,7 @@ export default function InstrumentChart({ priceData, indicators, events = [], he
       cleanupRef.current?.()
       cleanupRef.current = null
     }
-  }, [priceData, indicators, events, height, chartType, theoryCurve])
+  }, [priceData, indicators, events, height, chartType, theoryCurve, onChartReady])
 
   return (
     <div className="bg-dark-900/60 rounded-xl border border-slate-700/40 overflow-hidden">
diff --git a/frontend/src/pages/InstrumentDashboard.tsx b/frontend/src/pages/InstrumentDashboard.tsx
index 2643ba3..d3452e1 100644
--- a/frontend/src/pages/InstrumentDashboard.tsx
+++ b/frontend/src/pages/InstrumentDashboard.tsx
@@ -697,27 +697,37 @@ const FRISE_POPUP_W  = 220  // largeur du popup
 
 function CausalFrise({
   events, templates, priceData, selectedDate, causalInsts,
+  chartDateToX, chartCanvasLeft, chartReady,
 }: {
-  events:       SnapshotEvent[]
-  templates:    CausalTemplate[]
-  priceData:    PriceCandle[]
-  selectedDate: string | null
-  causalInsts:  string[]
+  events:          SnapshotEvent[]
+  templates:       CausalTemplate[]
+  priceData:       PriceCandle[]
+  selectedDate:    string | null
+  causalInsts:     string[]
+  chartDateToX?:   (d: string) => number | null
+  chartCanvasLeft?: number
+  chartReady?:     number
 }) {
   const navigate     = useNavigate()
   const containerRef = useRef<HTMLDivElement>(null)
   const [contWidth, setContWidth]   = useState(400)
+  const [contLeft,  setContLeft]    = useState(0)
   const [activeChip, setActiveChip] = useState<{
     tmpl: CausalTemplate; ev: SnapshotEvent; chipX: number; chipY: number
   } | null>(null)
 
   useEffect(() => {
     const el = containerRef.current; if (!el) return
-    setContWidth(el.getBoundingClientRect().width)
-    const obs = new ResizeObserver(e => setContWidth(e[0].contentRect.width))
+    const update = () => {
+      const rect = el.getBoundingClientRect()
+      setContWidth(rect.width)
+      setContLeft(rect.left)
+    }
+    update()
+    const obs = new ResizeObserver(update)
     obs.observe(el)
     return () => obs.disconnect()
-  }, [])
+  }, [chartReady])  // re-measure when chart is ready (layout may have changed)
 
   // Close popup on outside click (tiny delay avoids self-close)
   useEffect(() => {
@@ -745,7 +755,20 @@ function CausalFrise({
   const minDate = priceData[0].time
   const maxDate = priceData[priceData.length - 1].time
   const usable  = Math.max(contWidth, 1)
-  const tdToX   = makeTdToX(priceData, usable)
+
+  // If chart coordinate bridge is available, use it for pixel-perfect alignment.
+  // chart.timeToCoordinate() gives x relative to chart canvas left edge.
+  // We subtract (chartCanvasLeft - contLeft) to convert to frise container coords.
+  // canvasOffset > 0 means chart canvas starts to the right of the frise container.
+  const canvasOffset = (chartCanvasLeft ?? 0) - contLeft
+  const tdToX: (d: string) => number = chartDateToX
+    ? (d: string) => {
+        const x = chartDateToX(d)
+        if (x !== null) return x - canvasOffset
+        // Fallback for out-of-range dates: clamp to edges
+        return d <= minDate ? -canvasOffset : usable - canvasOffset
+      }
+    : makeTdToX(priceData, usable)
 
   // Build chips (one per event × template)
   type Chip = {
@@ -1004,6 +1027,10 @@ export default function InstrumentDashboard() {
   const [theoryCurve, setTheoryCurve]   = useState<TheoPoint[] | null>(null)
   const [loadingTheory, setLoadingTheory] = useState(false)
   const [showTheory, setShowTheory]     = useState(false)
+  // Chart coordinate bridge — lets CausalFrise align with the chart's x-axis
+  const chartDateToXRef = useRef<((d: string) => number | null) | null>(null)
+  const chartCanvasLeftRef = useRef<number>(0)
+  const [chartReady, setChartReady] = useState(0)   // bump to trigger frise re-render
 
   const instrumentId = id.toUpperCase()
 
@@ -1020,6 +1047,8 @@ export default function InstrumentDashboard() {
     setMacroAtDate(null)
     setTheoryCurve(null)
     setShowTheory(false)
+    chartDateToXRef.current = null
+    setChartReady(0)
     api.get(`/instruments/${instrumentId}/snapshot?period=${period}`)
       .then(r => {
         setSnapshot(r.data)
@@ -1042,6 +1071,12 @@ export default function InstrumentDashboard() {
     if (date) setSelectedDate(date)
   }, [])
 
+  const handleChartReady = useCallback((fn: ((d: string) => number | null) | null, left: number) => {
+    chartDateToXRef.current = fn
+    chartCanvasLeftRef.current = left
+    setChartReady(k => k + 1)
+  }, [])
+
   const toggleTheory = useCallback(() => {
     if (showTheory) {
       setShowTheory(false)
@@ -1253,6 +1288,7 @@ export default function InstrumentDashboard() {
             chartType={chartStyle}
             onDateHover={handleDateHover}
             theoryCurve={showTheory && theoryCurve ? theoryCurve : undefined}
+            onChartReady={handleChartReady}
           />
 
           {/* Date badge */}
@@ -1342,6 +1378,9 @@ export default function InstrumentDashboard() {
                   priceData={snapshot.price_data}
                   selectedDate={effectiveDate}
                   causalInsts={causalInsts}
+                  chartDateToX={chartDateToXRef.current ?? undefined}
+                  chartCanvasLeft={chartCanvasLeftRef.current}
+                  chartReady={chartReady}
                 />
               </div>