diff --git a/components/jira/BurndownChart.tsx b/components/jira/BurndownChart.tsx
index a7fbc65..cb33ff0 100644
--- a/components/jira/BurndownChart.tsx
+++ b/components/jira/BurndownChart.tsx
@@ -131,12 +131,12 @@ export function BurndownChart({ sprintHistory, className }: BurndownChartProps)
       {/* Légende visuelle */}
       <div className="mb-4 flex justify-center gap-6 text-sm">
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-green-500 border-dashed border-t-2 border-green-500"></div>
-          <span className="text-green-500">Idéal</span>
+          <div className="w-4 h-0.5 bg-green-600 dark:bg-green-500 border-dashed border-t-2 border-green-600 dark:border-green-500"></div>
+          <span className="text-green-600 dark:text-green-500">Idéal</span>
         </div>
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-blue-500"></div>
-          <span className="text-blue-500">Réel</span>
+          <div className="w-4 h-0.5 bg-blue-600 dark:bg-blue-500"></div>
+          <span className="text-blue-600 dark:text-blue-500">Réel</span>
         </div>
       </div>
       
diff --git a/components/jira/CollaborationMatrix.tsx b/components/jira/CollaborationMatrix.tsx
index fe674b7..26c961d 100644
--- a/components/jira/CollaborationMatrix.tsx
+++ b/components/jira/CollaborationMatrix.tsx
@@ -2,7 +2,7 @@
 
 import React from 'react';
 import { JiraAnalytics } from '@/lib/types';
-import { Card, CardContent, CardHeader } from '@/components/ui/Card';
+import { Card } from '@/components/ui/Card';
 
 interface CollaborationMatrixProps {
   analytics: JiraAnalytics;
@@ -78,17 +78,9 @@ export function CollaborationMatrix({ analytics, className }: CollaborationMatri
   // Couleur d'intensité
   const getIntensityColor = (intensity: 'low' | 'medium' | 'high') => {
     switch (intensity) {
-      case 'high': return 'bg-green-500';
-      case 'medium': return 'bg-yellow-500';
-      case 'low': return 'bg-gray-400';
-    }
-  };
-
-  const getIntensityLabel = (intensity: 'low' | 'medium' | 'high') => {
-    switch (intensity) {
-      case 'high': return 'Forte';
-      case 'medium': return 'Modérée';
-      case 'low': return 'Faible';
+      case 'high': return 'bg-green-600 dark:bg-green-500';
+      case 'medium': return 'bg-yellow-600 dark:bg-yellow-500';
+      case 'low': return 'bg-gray-500 dark:bg-gray-400';
     }
   };
 
@@ -108,8 +100,8 @@ export function CollaborationMatrix({ analytics, className }: CollaborationMatri
                       Score: {person.collaborationScore}
                     </span>
                     <div className={`w-3 h-3 rounded-full ${
-                      person.isolation < 30 ? 'bg-green-500' : 
-                      person.isolation < 60 ? 'bg-yellow-500' : 'bg-red-500'
+                      person.isolation < 30 ? 'bg-green-600 dark:bg-green-500' : 
+                      person.isolation < 60 ? 'bg-yellow-600 dark:bg-yellow-500' : 'bg-red-600 dark:bg-red-500'
                     }`} />
                   </div>
                 </div>
@@ -149,8 +141,7 @@ export function CollaborationMatrix({ analytics, className }: CollaborationMatri
                   const ranges = [[0, 30], [30, 50], [50, 70], [70, 100]];
                   const [min, max] = ranges[index];
                   const count = collaborationData.filter(d => d.isolation >= min && d.isolation < max).length;
-                  const percentage = (count / collaborationData.length) * 100;
-                  const colors = ['bg-green-500', 'bg-blue-500', 'bg-yellow-500', 'bg-red-500'];
+                  const colors = ['bg-green-600 dark:bg-green-500', 'bg-blue-600 dark:bg-blue-500', 'bg-yellow-600 dark:bg-yellow-500', 'bg-red-600 dark:bg-red-500'];
                   
                   return (
                     <div key={level} className="flex items-center gap-2 text-xs">
diff --git a/components/jira/JiraSync.tsx b/components/jira/JiraSync.tsx
index e4327e5..e7c2e90 100644
--- a/components/jira/JiraSync.tsx
+++ b/components/jira/JiraSync.tsx
@@ -149,7 +149,7 @@ export function JiraSync({ onSyncComplete, className = "" }: JiraSyncProps) {
       <CardHeader className="pb-3">
         <div className="flex items-center justify-between">
           <div className="flex items-center gap-3">
-            <div className="w-2 h-2 rounded-full bg-blue-400 animate-pulse"></div>
+            <div className="w-2 h-2 rounded-full bg-blue-500 dark:bg-blue-400 animate-pulse"></div>
             <h3 className="font-mono text-sm font-bold text-blue-400 uppercase tracking-wider">
               JIRA SYNC
             </h3>
diff --git a/components/jira/SprintComparison.tsx b/components/jira/SprintComparison.tsx
index 77b5f2d..03d6d5a 100644
--- a/components/jira/SprintComparison.tsx
+++ b/components/jira/SprintComparison.tsx
@@ -1,8 +1,8 @@
 'use client';
 
-import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, BarChart, Bar, Cell } from 'recharts';
+import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, BarChart, Bar } from 'recharts';
 import { SprintVelocity } from '@/lib/types';
-import { Card, CardContent, CardHeader } from '@/components/ui/Card';
+import { Card } from '@/components/ui/Card';
 
 interface SprintComparisonProps {
   sprintHistory: SprintVelocity[];
diff --git a/components/jira/TeamActivityHeatmap.tsx b/components/jira/TeamActivityHeatmap.tsx
index f73b776..681e6e5 100644
--- a/components/jira/TeamActivityHeatmap.tsx
+++ b/components/jira/TeamActivityHeatmap.tsx
@@ -21,21 +21,21 @@ export function TeamActivityHeatmap({ workloadByAssignee, statusDistribution, cl
   // Couleurs pour les différents types de travail
   const getWorkloadColor = (todo: number, inProgress: number, review: number) => {
     const total = todo + inProgress + review;
-    if (total === 0) return 'bg-[var(--muted)]/20';
+    if (total === 0) return null; // Géré séparément
     
-    // Dominante par type de travail
+    // Dominante par type de travail avec couleurs CSS directes (versions plus douces)
     if (review > inProgress && review > todo) {
-      return 'bg-purple-500'; // Review dominant
+      return '#a855f7'; // purple-500 - Review dominant (plus doux)
     } else if (inProgress > todo) {
-      return 'bg-orange-500'; // In Progress dominant
+      return '#f59e0b'; // amber-500 - In Progress dominant (plus doux)
     } else {
-      return 'bg-blue-500'; // Todo dominant
+      return '#3b82f6'; // blue-500 - Todo dominant (plus doux)
     }
   };
 
   const getOpacity = (total: number) => {
     const intensity = getIntensity(total);
-    return Math.max(0.2, intensity / 100);
+    return Math.max(0.6, Math.min(0.9, intensity / 100)); // Opacité plus élevée et moins de variation
   };
 
   return (
@@ -45,28 +45,37 @@ export function TeamActivityHeatmap({ workloadByAssignee, statusDistribution, cl
         <div>
           <h4 className="text-sm font-medium mb-3">Intensité de travail par membre</h4>
           <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-2">
-            {workloadByAssignee.map(assignee => (
-              <div
-                key={assignee.assignee}
-                className="relative p-3 rounded-lg border border-[var(--border)] transition-all hover:scale-105"
-                style={{
-                  backgroundColor: getWorkloadColor(assignee.todoCount, assignee.inProgressCount, assignee.reviewCount),
-                  opacity: getOpacity(assignee.totalActive)
-                }}
-              >
-                <div className="text-white text-xs font-medium mb-1 truncate">
+            {workloadByAssignee.map(assignee => {
+              const bgColor = getWorkloadColor(assignee.todoCount, assignee.inProgressCount, assignee.reviewCount);
+              const isEmpty = assignee.totalActive === 0;
+              
+              return (
+                <div
+                  key={assignee.assignee}
+                  className={`relative p-3 rounded-lg border border-[var(--border)] transition-all hover:scale-105 ${
+                    isEmpty ? 'bg-[var(--muted)]/30' : ''
+                  }`}
+                  style={bgColor ? {
+                    backgroundColor: bgColor,
+                    opacity: getOpacity(assignee.totalActive)
+                  } : {
+                    opacity: getOpacity(assignee.totalActive)
+                  }}
+                >
+                <div className={isEmpty ? "text-[var(--foreground)] text-xs font-medium mb-1 truncate" : "text-white text-xs font-medium mb-1 truncate"}>
                   {assignee.displayName}
                 </div>
-                <div className="text-white text-lg font-bold">
+                <div className={isEmpty ? "text-[var(--foreground)] text-lg font-bold" : "text-white text-lg font-bold"}>
                   {assignee.totalActive}
                 </div>
-                <div className="text-white/80 text-xs">
+                <div className={isEmpty ? "text-[var(--muted-foreground)] text-xs" : "text-white/80 text-xs"}>
                   {assignee.todoCount > 0 && `${assignee.todoCount} à faire`}
                   {assignee.inProgressCount > 0 && ` ${assignee.inProgressCount} en cours`}
                   {assignee.reviewCount > 0 && ` ${assignee.reviewCount} review`}
                 </div>
               </div>
-            ))}
+              );
+            })}
           </div>
         </div>
 
@@ -77,7 +86,7 @@ export function TeamActivityHeatmap({ workloadByAssignee, statusDistribution, cl
             <span>À faire dominant</span>
           </div>
           <div className="flex items-center gap-2">
-            <div className="w-3 h-3 bg-orange-500 rounded"></div>
+            <div className="w-3 h-3 bg-amber-500 rounded"></div>
             <span>En cours dominant</span>
           </div>
           <div className="flex items-center gap-2">
diff --git a/components/jira/ThroughputChart.tsx b/components/jira/ThroughputChart.tsx
index 1a785c8..420e18a 100644
--- a/components/jira/ThroughputChart.tsx
+++ b/components/jira/ThroughputChart.tsx
@@ -138,16 +138,16 @@ export function ThroughputChart({ sprintHistory, className }: ThroughputChartPro
       {/* Légende visuelle */}
       <div className="mb-4 flex justify-center gap-6 text-sm">
         <div className="flex items-center gap-2">
-          <div className="w-4 h-3 bg-blue-500 rounded-sm"></div>
-          <span className="text-blue-500">Points complétés</span>
+          <div className="w-4 h-3 bg-blue-600 dark:bg-blue-500 rounded-sm"></div>
+          <span className="text-blue-600 dark:text-blue-500">Points complétés</span>
         </div>
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-green-500"></div>
-          <span className="text-green-500">Throughput</span>
+          <div className="w-4 h-0.5 bg-green-600 dark:bg-green-500"></div>
+          <span className="text-green-600 dark:text-green-500">Throughput</span>
         </div>
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-orange-500 border-dashed border-t-2 border-orange-500"></div>
-          <span className="text-orange-500">Tendance</span>
+          <div className="w-4 h-0.5 bg-orange-600 dark:bg-orange-500 border-dashed border-t-2 border-orange-600 dark:border-orange-500"></div>
+          <span className="text-orange-600 dark:text-orange-500">Tendance</span>
         </div>
       </div>
       
diff --git a/lib/jira-period-filter.ts b/lib/jira-period-filter.ts
index 5e15594..a6fa8ac 100644
--- a/lib/jira-period-filter.ts
+++ b/lib/jira-period-filter.ts
@@ -1,4 +1,4 @@
-import { JiraAnalytics, JiraTask, SprintVelocity } from './types';
+import { JiraAnalytics } from './types';
 
 export type PeriodFilter = '7d' | '30d' | '3m' | 'current';
 
diff --git a/src/actions/jira-export.ts b/src/actions/jira-export.ts
index b62d0cd..5221e7c 100644
--- a/src/actions/jira-export.ts
+++ b/src/actions/jira-export.ts
@@ -11,6 +11,82 @@ export type ExportResult = {
   error?: string;
 };
 
+export interface JiraProjectMetrics {
+  key: string;
+  name: string;
+  totalIssues: number;
+}
+
+export interface AssigneeMetrics {
+  assignee: string;
+  displayName: string;
+  totalIssues: number;
+  completedIssues: number;
+  inProgressIssues: number;
+  percentage: number;
+}
+
+export interface TeamMetrics {
+  issuesDistribution: AssigneeMetrics[];
+  totalAssignees: number;
+  activeAssignees: number;
+}
+
+export interface SprintHistory {
+  sprintName: string;
+  startDate: string;
+  endDate: string;
+  plannedPoints: number;
+  completedPoints: number;
+  completionRate: number;
+}
+
+export interface VelocityMetrics {
+  sprintHistory: SprintHistory[];
+  currentSprintPoints: number;
+  averageVelocity: number;
+}
+
+export interface CycleTimeByType {
+  issueType: string;
+  averageDays: number;
+  medianDays: number;
+  samples: number;
+}
+
+export interface CycleTimeMetrics {
+  cycleTimeByType: CycleTimeByType[];
+  averageCycleTime: number;
+}
+
+export interface WorkInProgressStatus {
+  status: string;
+  count: number;
+  percentage: number;
+}
+
+export interface WorkInProgressAssignee {
+  assignee: string;
+  displayName: string;
+  todoCount: number;
+  inProgressCount: number;
+  reviewCount: number;
+  totalActive: number;
+}
+
+export interface WorkInProgress {
+  byStatus: WorkInProgressStatus[];
+  byAssignee: WorkInProgressAssignee[];
+}
+
+export interface JiraAnalytics {
+  project: JiraProjectMetrics;
+  teamMetrics: TeamMetrics;
+  velocityMetrics: VelocityMetrics;
+  cycleTimeMetrics: CycleTimeMetrics;
+  workInProgress: WorkInProgress;
+}
+
 /**
  * Server Action pour exporter les analytics Jira au format CSV ou JSON
  */
@@ -60,7 +136,7 @@ export async function exportJiraAnalytics(format: ExportFormat = 'csv'): Promise
 /**
  * Génère un CSV à partir des analytics Jira
  */
-function generateCSV(analytics: any): string {
+function generateCSV(analytics: JiraAnalytics): string {
   const lines: string[] = [];
 
   // Header du rapport
@@ -73,7 +149,7 @@ function generateCSV(analytics: any): string {
   // Section 1: Métriques d'équipe
   lines.push('## Répartition de l\'équipe');
   lines.push('Assignee,Nom,Total Tickets,Tickets Complétés,Tickets En Cours,Pourcentage');
-  analytics.teamMetrics.issuesDistribution.forEach((assignee: any) => {
+  analytics.teamMetrics.issuesDistribution.forEach((assignee: AssigneeMetrics) => {
     lines.push([
       escapeCsv(assignee.assignee),
       escapeCsv(assignee.displayName),
@@ -88,7 +164,7 @@ function generateCSV(analytics: any): string {
   // Section 2: Historique des sprints
   lines.push('## Historique des sprints');
   lines.push('Sprint,Date Début,Date Fin,Points Planifiés,Points Complétés,Taux de Complétion');
-  analytics.velocityMetrics.sprintHistory.forEach((sprint: any) => {
+  analytics.velocityMetrics.sprintHistory.forEach((sprint: SprintHistory) => {
     lines.push([
       escapeCsv(sprint.sprintName),
       sprint.startDate.slice(0, 10),
@@ -103,7 +179,7 @@ function generateCSV(analytics: any): string {
   // Section 3: Cycle time par type
   lines.push('## Cycle Time par type de ticket');
   lines.push('Type de Ticket,Temps Moyen (jours),Temps Médian (jours),Échantillons');
-  analytics.cycleTimeMetrics.cycleTimeByType.forEach((type: any) => {
+  analytics.cycleTimeMetrics.cycleTimeByType.forEach((type: CycleTimeByType) => {
     lines.push([
       escapeCsv(type.issueType),
       type.averageDays,
@@ -116,7 +192,7 @@ function generateCSV(analytics: any): string {
   // Section 4: Work in Progress
   lines.push('## Work in Progress par statut');
   lines.push('Statut,Nombre,Pourcentage');
-  analytics.workInProgress.byStatus.forEach((status: any) => {
+  analytics.workInProgress.byStatus.forEach((status: WorkInProgressStatus) => {
     lines.push([
       escapeCsv(status.status),
       status.count,
@@ -128,7 +204,7 @@ function generateCSV(analytics: any): string {
   // Section 5: Charge de travail par assignee
   lines.push('## Charge de travail par assignee');
   lines.push('Assignee,Nom,À Faire,En Cours,En Revue,Total Actif');
-  analytics.workInProgress.byAssignee.forEach((assignee: any) => {
+  analytics.workInProgress.byAssignee.forEach((assignee: WorkInProgressAssignee) => {
     lines.push([
       escapeCsv(assignee.assignee),
       escapeCsv(assignee.displayName),