diff --git a/src/App.tsx b/src/App.tsx
index 65e4b37..f5d1550 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -423,6 +423,7 @@ export default function App() {
                   groups={groups}
                   sprintFieldId={sprintFieldResolved}
                   ganttSprintRowMetric={dashboardCfg.ganttSprintRowMetric}
+                  ganttNonWorkingDates={dashboardCfg.ganttNonWorkingDates}
                   onGanttSprintRowMetricChange={setGanttSprintRowMetric}
                   onOpenSettings={() => setSettingsOpen(true)}
                 />
diff --git a/src/components/DashboardSettingsModal.tsx b/src/components/DashboardSettingsModal.tsx
index 8162325..551daa1 100644
--- a/src/components/DashboardSettingsModal.tsx
+++ b/src/components/DashboardSettingsModal.tsx
@@ -5,6 +5,7 @@ import {
   GANTT_SPRINT_METRIC_OPTIONS,
   mergeImportedConfig,
   normalizeFunctionalGapsForSave,
+  parseGanttNonWorkingDatesFromText,
   sanitizeExcludedSprintIds,
   type DashboardConfig,
   type FunctionalGapBadge,
@@ -108,11 +109,18 @@ export function DashboardSettingsModal({ open, config, onClose, onSave, boardSpr
   const fileRef = useRef<HTMLInputElement>(null)
   const titleId = useId()
   const [draft, setDraft] = useState<DashboardConfig>(config)
+  const [ganttNonWorkInput, setGanttNonWorkInput] = useState('')
 
   useEffect(() => {
     if (open) setDraft(config)
   }, [open, config])
 
+  const configNonWorkKey = config.ganttNonWorkingDates.join('|')
+  useEffect(() => {
+    if (!open) return
+    setGanttNonWorkInput(config.ganttNonWorkingDates.join('\n'))
+  }, [open, configNonWorkKey])
+
   useEffect(() => {
     const el = dialogRef.current
     if (!el) return
@@ -146,8 +154,10 @@ export function DashboardSettingsModal({ open, config, onClose, onSave, boardSpr
       try {
         const parsed = JSON.parse(String(reader.result)) as unknown
         const merged = mergeImportedConfig(draft, parsed)
-        if (merged) setDraft(merged)
-        else alert('Fichier JSON invalide (configuration v1 ou bundle Synology v1).')
+        if (merged) {
+          setDraft(merged)
+          setGanttNonWorkInput(merged.ganttNonWorkingDates.join('\n'))
+        } else alert('Fichier JSON invalide (configuration v1 ou bundle Synology v1).')
       } catch {
         alert('Impossible de lire ce fichier JSON.')
       }
@@ -373,6 +383,21 @@ export function DashboardSettingsModal({ open, config, onClose, onSave, boardSpr
               </option>
             ))}
           </select>
+          <label className="mt-3 block text-[10px] font-semibold uppercase tracking-wide text-indigo-200/80">
+            Jours non travaillés (Gantt)
+          </label>
+          <p className="mt-1 text-[10px] leading-relaxed text-slate-500">
+            Une date par ligne au format <span className="font-mono text-slate-400">AAAA-MM-JJ</span> (fuseau
+            local du navigateur). Même style que sam. / dim. : fériés, ponts, fermeture.
+          </p>
+          <textarea
+            rows={4}
+            spellCheck={false}
+            placeholder={'2026-05-01\n2026-05-08'}
+            className="mt-1.5 w-full resize-y rounded-lg border border-white/10 bg-black/30 px-2 py-1.5 font-mono text-[11px] leading-relaxed text-slate-200 outline-none ring-indigo-500/20 focus:ring-1"
+            value={ganttNonWorkInput}
+            onChange={(e) => setGanttNonWorkInput(e.target.value)}
+          />
           <p className="mt-3 text-[10px] font-semibold uppercase tracking-wide text-indigo-200/80">
             Sprints à masquer
           </p>
@@ -649,6 +674,7 @@ export function DashboardSettingsModal({ open, config, onClose, onSave, boardSpr
               ...draft,
               functionalGaps: normalizeFunctionalGapsForSave(draft.functionalGaps),
               excludedSprintIds: sanitizeExcludedSprintIds(draft.excludedSprintIds),
+              ganttNonWorkingDates: parseGanttNonWorkingDatesFromText(ganttNonWorkInput),
             })
             onClose()
           }}
diff --git a/src/components/SprintGanttView.tsx b/src/components/SprintGanttView.tsx
index a785da3..910f06b 100644
--- a/src/components/SprintGanttView.tsx
+++ b/src/components/SprintGanttView.tsx
@@ -31,6 +31,8 @@ type Props = {
   groups: StoryGroup[]
   sprintFieldId: string | null
   ganttSprintRowMetric: GanttSprintRowMetric
+  /** Dates yyyy-mm-dd (local) en plus des week-ends pour le fond du Gantt. */
+  ganttNonWorkingDates: string[]
   onGanttSprintRowMetricChange: (m: GanttSprintRowMetric) => void
   onOpenSettings: () => void
 }
@@ -105,7 +107,7 @@ function GanttTimelineBackdrop({
   return (
     <>
       {dayColumns
-        .filter((c) => c.isWeekend)
+        .filter((c) => c.isGanttNonWork)
         .map((c) => (
           <div
             key={c.dayStartMs}
@@ -145,6 +147,7 @@ export function SprintGanttView({
   groups,
   sprintFieldId,
   ganttSprintRowMetric,
+  ganttNonWorkingDates,
   onGanttSprintRowMetricChange,
   onOpenSettings,
 }: Props) {
@@ -187,9 +190,10 @@ export function SprintGanttView({
     [startMs, endMs, ppd],
   )
 
+  const nonWorkingSet = useMemo(() => new Set(ganttNonWorkingDates), [ganttNonWorkingDates])
   const dayColumns = useMemo(
-    () => ganttDayColumns(startMs, endMs, widthPx),
-    [startMs, endMs, widthPx],
+    () => ganttDayColumns(startMs, endMs, widthPx, nonWorkingSet),
+    [startMs, endMs, widthPx, nonWorkingSet],
   )
   const monthBands = useMemo(
     () => ganttMonthBands(startMs, endMs, widthPx),
@@ -271,8 +275,9 @@ export function SprintGanttView({
           <p className="mt-1 max-w-3xl text-xs leading-relaxed text-slate-500">
             Échelle <span className="text-slate-400">jour / semaine / mois</span> et zoom (loupe) : la
             timeline s’étire en pixels par jour — faites défiler horizontalement. En-tête : mois puis
-            jours / repères ; week-ends en fond plus sombre. Barre = charge (champ Sprint) ou
-            avancement calendaire. Losanges = jalons (survol pour le détail).
+            jours (sans répéter le mois) ; week-ends et jours configurés en fond plus sombre. Remplissage
+            des barres = % de sous-tâches terminées (champ Sprint). Losanges = jalons (survol pour le
+            détail).
           </p>
         </div>
         <button
@@ -286,9 +291,10 @@ export function SprintGanttView({
 
       {!sprintFieldId && (
         <p className="mb-3 rounded-lg border border-sky-500/20 bg-sky-500/10 px-3 py-2 text-xs text-sky-100/90">
-          Sans champ Sprint, la barre reflète surtout l’
-          <span className="font-medium text-sky-50">avancement temporel</span>. Ajoutez{' '}
-          <code className="rounded bg-black/30 px-1 font-mono">customfield_…</code> pour la charge réelle.
+          Sans champ Sprint, le <span className="font-medium text-sky-50">remplissage des barres reste à 0 %</span>{' '}
+          (aucune sous-tâche rattachée au sprint). Ajoutez{' '}
+          <code className="rounded bg-black/30 px-1 font-mono">customfield_…</code> pour agréger les sous-tâches
+          par sprint.
         </p>
       )}
 
@@ -457,8 +463,10 @@ export function SprintGanttView({
             )
             const barTitle =
               sprintFieldId && delivery.total > 0
-                ? `${s.name}\n${formatSprintRangeFr(s)}\nSous-tâches : ${delivery.done} / ${delivery.total} (${delivery.percent} %)\n${subtitleLines.join('\n')}`
-                : `${s.name}\n${formatSprintRangeFr(s)}\nAvancée calendaire : ${fill} %\n${subtitleLines.join('\n')}`
+                ? `${s.name}\n${formatSprintRangeFr(s)}\nBarre : ${delivery.percent} % des sous-tâches terminées (${delivery.done} / ${delivery.total})\n${subtitleLines.join('\n')}`
+                : sprintFieldId
+                  ? `${s.name}\n${formatSprintRangeFr(s)}\nBarre : 0 % — aucune sous-tâche (non annulée) dans ce sprint avec le champ Sprint.\n${subtitleLines.join('\n')}`
+                  : `${s.name}\n${formatSprintRangeFr(s)}\nBarre : 0 % — configurez le champ Sprint dans les réglages.\n${subtitleLines.join('\n')}`
 
             return (
               <div key={s.id} className="contents">
diff --git a/src/lib/dashboardConfig.ts b/src/lib/dashboardConfig.ts
index 48455bd..e08a3b2 100644
--- a/src/lib/dashboardConfig.ts
+++ b/src/lib/dashboardConfig.ts
@@ -149,6 +149,28 @@ export function sanitizeExcludedSprintIds(raw: unknown): number[] {
   return [...new Set(out)]
 }
 
+const ISO_DATE_RE = /^\d{4}-\d{2}-\d{2}$/
+
+/** Jours fériés / ponts (clé locale yyyy-mm-dd) — même fond atténué que les week-ends sur le Gantt. */
+export function sanitizeGanttNonWorkingDates(raw: unknown): string[] {
+  if (!Array.isArray(raw)) return []
+  const out: string[] = []
+  for (const x of raw) {
+    const s = typeof x === 'string' ? x.trim().slice(0, 10) : ''
+    if (ISO_DATE_RE.test(s)) out.push(s)
+  }
+  return [...new Set(out)].sort()
+}
+
+/** Parse une zone de texte (lignes ou séparateurs virgule / point-virgule). */
+export function parseGanttNonWorkingDatesFromText(raw: string): string[] {
+  const parts = raw
+    .split(/[\n,;\t]+/)
+    .map((s) => s.trim())
+    .filter(Boolean)
+  return sanitizeGanttNonWorkingDates(parts)
+}
+
 export type DashboardConfig = {
   version: 1
   milestones: Milestone[]
@@ -174,6 +196,8 @@ export type DashboardConfig = {
   excludedSprintIds: number[]
   /** Lignes d’info sous les barres de sprint (Gantt). */
   ganttSprintRowMetric: GanttSprintRowMetric
+  /** Dates non travaillées (yyyy-mm-dd, fuseau local) — fond Gantt comme week-end. */
+  ganttNonWorkingDates: string[]
 }
 
 const STORAGE_KEY = 'dcc-dashboard-config-v1'
@@ -189,6 +213,7 @@ export const defaultDashboardConfig = (): DashboardConfig => ({
   functionalGaps: defaultFunctionalGaps(),
   excludedSprintIds: [],
   ganttSprintRowMetric: defaultGanttSprintRowMetric(),
+  ganttNonWorkingDates: [],
 })
 
 /** Import : configuration seule, ou bundle Synology `{ bundleVersion, dashboard }`. */
@@ -246,6 +271,7 @@ export function loadDashboardConfig(): DashboardConfig {
       functionalGaps: sanitizeFunctionalGapsArray(parsed.functionalGaps, defaultFunctionalGaps()),
       excludedSprintIds: sanitizeExcludedSprintIds(parsed.excludedSprintIds),
       ganttSprintRowMetric: sanitizeGanttSprintRowMetric(parsed.ganttSprintRowMetric),
+      ganttNonWorkingDates: sanitizeGanttNonWorkingDates(parsed.ganttNonWorkingDates),
     }
   } catch {
     return defaultDashboardConfig()
@@ -329,5 +355,9 @@ export function mergeImportedConfig(
       o.ganttSprintRowMetric !== undefined
         ? sanitizeGanttSprintRowMetric(o.ganttSprintRowMetric)
         : current.ganttSprintRowMetric,
+    ganttNonWorkingDates:
+      o.ganttNonWorkingDates !== undefined
+        ? sanitizeGanttNonWorkingDates(o.ganttNonWorkingDates)
+        : current.ganttNonWorkingDates,
   }
 }
diff --git a/src/lib/sprintGantt.ts b/src/lib/sprintGantt.ts
index 55433c2..78622dd 100644
--- a/src/lib/sprintGantt.ts
+++ b/src/lib/sprintGantt.ts
@@ -200,19 +200,33 @@ export function monthTicksBetween(startMs: number, endMs: number): { ms: number;
   return ticks
 }
 
-/** Colonne calendaire (jour) projetée sur la timeline — week-ends, grille jour. */
+/** Colonne calendaire (jour) projetée sur la timeline — week-ends, jours configurés, grille. */
 export type GanttDayColumn = {
   dayStartMs: number
   weekday: number
   x0: number
   x1: number
-  isWeekend: boolean
+  /** Fond atténué : samedi / dimanche ou date listée dans les réglages Gantt. */
+  isGanttNonWork: boolean
+}
+
+function localIsoDateKey(dayStartMs: number): string {
+  const d = new Date(dayStartMs)
+  const y = d.getFullYear()
+  const m = String(d.getMonth() + 1).padStart(2, '0')
+  const day = String(d.getDate()).padStart(2, '0')
+  return `${y}-${m}-${day}`
 }
 
 /**
  * Une entrée par jour local qui intersecte [startMs, endMs] (bornes en pixels pour le fond).
  */
-export function ganttDayColumns(startMs: number, endMs: number, widthPx: number): GanttDayColumn[] {
+export function ganttDayColumns(
+  startMs: number,
+  endMs: number,
+  widthPx: number,
+  nonWorkingKeys?: ReadonlySet<string>,
+): GanttDayColumn[] {
   const cols: GanttDayColumn[] = []
   const iter = new Date(startMs)
   iter.setHours(0, 0, 0, 0)
@@ -229,12 +243,15 @@ export function ganttDayColumns(startMs: number, endMs: number, widthPx: number)
       const x0 = msToX(Math.max(dayStart, startMs), startMs, endMs, widthPx)
       const x1 = msToX(Math.min(dayEnd, endMs), startMs, endMs, widthPx)
       if (x1 > x0 + 0.02) {
+        const key = localIsoDateKey(dayStart)
+        const isWeekend = wd === 0 || wd === 6
+        const isConfigured = nonWorkingKeys?.has(key) ?? false
         cols.push({
           dayStartMs: dayStart,
           weekday: wd,
           x0,
           x1,
-          isWeekend: wd === 0 || wd === 6,
+          isGanttNonWork: isWeekend || isConfigured,
         })
       }
     }
@@ -308,10 +325,10 @@ export function ganttSubheaderTicks(
     for (let i = 0; i < cols.length; i += step) {
       const c = cols[i]!
       const d = new Date(c.dayStartMs)
+      const wdShort = d.toLocaleDateString('fr-FR', { weekday: 'short' }).replace(/\.$/, '')
+      const dom = d.getDate()
       const label =
-        step === 1 && avgW >= 26
-          ? d.toLocaleDateString('fr-FR', { weekday: 'short', day: 'numeric', month: 'short' })
-          : d.toLocaleDateString('fr-FR', { day: '2-digit', month: 'short' })
+        step === 1 && avgW >= 26 ? `${wdShort} ${dom}` : `${dom}`
       const x = (c.x0 + c.x1) / 2
       const major = d.getDate() === 1 || d.getDay() === 1
       out.push({ ms: c.dayStartMs, label, x, major })
@@ -326,7 +343,8 @@ export function ganttSubheaderTicks(
     while (t <= endMs + MS_DAY && guard++ < 140) {
       if (t + 6 * MS_DAY >= startMs) {
         const d = new Date(t)
-        const label = d.toLocaleDateString('fr-FR', { day: 'numeric', month: 'short' })
+        const wdShort = d.toLocaleDateString('fr-FR', { weekday: 'short' }).replace(/\.$/, '')
+        const label = `${wdShort} ${d.getDate()}`
         const x = msToX(t + 3.5 * MS_DAY, startMs, endMs, widthPx)
         out.push({ ms: t, label, x, major: true })
       }
@@ -427,8 +445,8 @@ export function sprintTimeElapsedPercent(s: JiraSprintSnapshot, nowMs = Date.now
 }
 
 /**
- * Remplissage de la barre : priorité au % sous-tâches terminées (périmètre + champ Sprint),
- * sinon avancement calendaire du sprint.
+ * Remplissage de la barre : uniquement le % de sous-tâches terminées (périmètre + champ Sprint).
+ * Pas d’avancement calendaire : sans données, la barre reste à 0 %.
  */
 export function sprintBarFillPercent(
   s: JiraSprintSnapshot,
@@ -437,8 +455,8 @@ export function sprintBarFillPercent(
   cfg: StatusBucketConfig,
 ): number {
   const delivery = epicScopeSprintProgress(groups, s.id, fieldId, cfg)
-  if (fieldId && delivery.total > 0) return Math.min(100, delivery.percent)
-  return sprintTimeElapsedPercent(s)
+  if (!fieldId || delivery.total === 0) return 0
+  return Math.min(100, delivery.percent)
 }
 
 export function milestoneTooltipText(m: Milestone): string {