feat: onboarding flow (6 screens) + audio engine + design system

Onboarding: - 6-screen flow: Problem → Empathy → Solution → Wow → Personalization → Paywall - useOnboarding hook with Zustand + AsyncStorage persistence - MiniTimerDemo with live 20s timer + haptics - Auto-redirect for first-time users - Mock RevenueCat for dev testing Audio: - useAudioEngine hook with expo-av - Phase sounds (count_3/2/1, beep, bell, fanfare) - Placeholder music tracks Design System: - Typography component + constants - GlassView component - Spacing, shadows, animations, borderRadius constants - Extended color palette (phase gradients, glass, surfaces) Timer: - Fix: handle 0-duration phases (immediate advance) - Enhanced TimerDisplay with phase gradients Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-17 21:52:23 +01:00
parent 31bdb1586f
commit fa189fe72e
55 changed files with 3361 additions and 320 deletions
--- a/app/(tabs)/_layout.tsx
+++ b/app/(tabs)/_layout.tsx
@@ -1,35 +1,41 @@
-import { Tabs } from 'expo-router';
-import React from 'react';
+import { Tabs } from 'expo-router'
+import Ionicons from '@expo/vector-icons/Ionicons'

-import { HapticTab } from '@/components/haptic-tab';
-import { IconSymbol } from '@/components/ui/icon-symbol';
-import { Colors } from '@/constants/theme';
-import { useColorScheme } from '@/hooks/use-color-scheme';
+import { HapticTab } from '@/components/haptic-tab'
+import { BRAND, SURFACE, TEXT, BORDER } from '@/src/shared/constants/colors'

 export default function TabLayout() {
-  const colorScheme = useColorScheme();
-
  return (
    <Tabs
      screenOptions={{
-        tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
        headerShown: false,
        tabBarButton: HapticTab,
-      }}>
+        tabBarActiveTintColor: BRAND.PRIMARY,
+        tabBarInactiveTintColor: TEXT.HINT,
+        tabBarStyle: {
+          backgroundColor: SURFACE.BASE,
+          borderTopColor: BORDER.SUBTLE,
+        },
+      }}
+    >
      <Tabs.Screen
        name="index"
        options={{
-          title: 'Home',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="house.fill" color={color} />,
+          title: 'Accueil',
+          tabBarIcon: ({ color, size }) => (
+            <Ionicons name="flame" size={size} color={color} />
+          ),
        }}
      />
      <Tabs.Screen
        name="explore"
        options={{
-          title: 'Explore',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+          title: 'Explorer',
+          tabBarIcon: ({ color, size }) => (
+            <Ionicons name="compass" size={size} color={color} />
+          ),
        }}
      />
    </Tabs>
-  );
+  )
 }
--- a/app/(tabs)/index.tsx
+++ b/app/(tabs)/index.tsx
@@ -1,67 +1,156 @@
-import { Pressable, StyleSheet, Text, View } from 'react-native'
-import { useRouter } from 'expo-router'
+import { useEffect, useRef } from 'react'
+import {
+  Animated,
+  Pressable,
+  StyleSheet,
+  Text,
+  View,
+} from 'react-native'
+import { useRouter, Redirect } from 'expo-router'
 import { StatusBar } from 'expo-status-bar'
+import { LinearGradient } from 'expo-linear-gradient'
 import { useSafeAreaInsets } from 'react-native-safe-area-context'

+import { BRAND, TEXT, APP_GRADIENTS, ACCENT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SHADOW, TEXT_SHADOW } from '@/src/shared/constants/shadows'
+import { DURATION, EASING } from '@/src/shared/constants/animations'
+import { useIsOnboardingComplete } from '@/src/features/onboarding/hooks/useOnboarding'
+
 export default function HomeScreen() {
  const router = useRouter()
  const insets = useSafeAreaInsets()
+  const isOnboardingComplete = useIsOnboardingComplete()
+
+  const glowAnim = useRef(new Animated.Value(0)).current
+
+  // Show nothing while Zustand hydrates
+  if (isOnboardingComplete === undefined) {
+    return null
+  }
+
+  // Redirect to onboarding if not complete
+  if (isOnboardingComplete === false) {
+    return <Redirect href="/onboarding" />
+  }
+
+  useEffect(() => {
+    Animated.loop(
+      Animated.sequence([
+        Animated.timing(glowAnim, {
+          toValue: 1,
+          duration: DURATION.BREATH,
+          easing: EASING.STANDARD,
+          useNativeDriver: false,
+        }),
+        Animated.timing(glowAnim, {
+          toValue: 0,
+          duration: DURATION.BREATH,
+          easing: EASING.STANDARD,
+          useNativeDriver: false,
+        }),
+      ])
+    ).start()
+  }, [])
+
+  const glowOpacity = glowAnim.interpolate({
+    inputRange: [0, 1],
+    outputRange: [0.15, 0.4],
+  })
+
+  const glowScale = glowAnim.interpolate({
+    inputRange: [0, 1],
+    outputRange: [1, 1.12],
+  })

  return (
-    <View style={[styles.container, { paddingTop: insets.top + 24 }]}>
+    <LinearGradient
+      colors={APP_GRADIENTS.HOME}
+      style={[styles.container, { paddingTop: insets.top + 40 }]}
+      start={{ x: 0, y: 0 }}
+      end={{ x: 1, y: 1 }}
+    >
      <StatusBar style="light" />

-      <Text style={styles.title}>TABATAGO</Text>
-      <Text style={styles.subtitle}>Entraînement Tabata</Text>
+      <View style={styles.brandArea}>
+        <Text style={styles.title}>TABATA</Text>
+        <Text style={styles.subtitle}>GO</Text>
+        <Text style={styles.tagline}>4 minutes. Tout donner.</Text>
+      </View>

-      <Pressable
-        style={({ pressed }) => [
-          styles.startButton,
-          pressed && styles.startButtonPressed,
-        ]}
-        onPress={() => router.push('/timer')}
-      >
-        <Text style={styles.startButtonText}>START</Text>
-      </Pressable>
-    </View>
+      <View style={styles.buttonArea}>
+        <Animated.View
+          style={[
+            styles.buttonGlow,
+            { opacity: glowOpacity, transform: [{ scale: glowScale }] },
+          ]}
+        />
+        <Pressable
+          style={({ pressed }) => [
+            styles.startButton,
+            pressed && styles.startButtonPressed,
+          ]}
+          onPress={() => router.push('/timer')}
+        >
+          <Text style={styles.startButtonText}>START</Text>
+        </Pressable>
+      </View>
+    </LinearGradient>
  )
 }

 const styles = StyleSheet.create({
  container: {
    flex: 1,
-    backgroundColor: '#1E1E2E',
    alignItems: 'center',
    justifyContent: 'center',
-    gap: 12,
+  },
+  brandArea: {
+    alignItems: 'center',
  },
  title: {
-    fontSize: 44,
-    fontWeight: '900',
-    color: '#FFFFFF',
-    letterSpacing: 6,
+    ...TYPOGRAPHY.brandTitle,
+    color: BRAND.PRIMARY,
+    ...TEXT_SHADOW.BRAND,
  },
  subtitle: {
-    fontSize: 18,
-    color: 'rgba(255, 255, 255, 0.6)',
-    fontWeight: '500',
+    ...TYPOGRAPHY.displaySmall,
+    color: TEXT.PRIMARY,
+    marginTop: -6,
+  },
+  tagline: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.HINT,
+    fontStyle: 'italic',
+    marginTop: 12,
+  },
+  buttonArea: {
+    marginTop: 72,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  buttonGlow: {
+    position: 'absolute',
+    width: 172,
+    height: 172,
+    borderRadius: 86,
+    backgroundColor: ACCENT.ORANGE,
  },
  startButton: {
    width: 160,
    height: 160,
    borderRadius: 80,
-    backgroundColor: '#F97316',
+    backgroundColor: BRAND.PRIMARY,
    alignItems: 'center',
    justifyContent: 'center',
-    marginTop: 60,
+    ...SHADOW.BRAND_GLOW,
  },
  startButtonPressed: {
-    opacity: 0.7,
+    transform: [{ scale: 0.95 }],
  },
  startButtonText: {
-    fontSize: 32,
-    fontWeight: '900',
-    color: '#FFFFFF',
+    ...TYPOGRAPHY.buttonHero,
+    color: TEXT.PRIMARY,
    letterSpacing: 4,
  },
 })
--- a/app/_layout.tsx
+++ b/app/_layout.tsx
@@ -1,9 +1,15 @@
+import { useEffect } from 'react';
 import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native';
 import { Stack } from 'expo-router';
 import { StatusBar } from 'expo-status-bar';
+import * as SplashScreen from 'expo-splash-screen';
 import 'react-native-reanimated';

 import { useColorScheme } from '@/hooks/use-color-scheme';
+import { useIsOnboardingComplete } from '@/src/features/onboarding/hooks/useOnboarding';
+
+// Prevent splash screen from auto-hiding
+SplashScreen.preventAutoHideAsync();

 export const unstable_settings = {
  anchor: '(tabs)',
@@ -11,10 +17,32 @@ export const unstable_settings = {

 export default function RootLayout() {
  const colorScheme = useColorScheme();
+  const isOnboardingComplete = useIsOnboardingComplete();
+
+  // Hide splash screen once we have a definite state
+  useEffect(() => {
+    if (isOnboardingComplete !== undefined) {
+      SplashScreen.hideAsync();
+    }
+  }, [isOnboardingComplete]);
+
+  // Show nothing while Zustand hydrates from AsyncStorage
+  if (isOnboardingComplete === undefined) {
+    return null;
+  }

  return (
    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
      <Stack>
+        <Stack.Screen
+          name="onboarding"
+          options={{
+            headerShown: false,
+            presentation: 'fullScreenModal',
+            animation: 'fade',
+            gestureEnabled: false,
+          }}
+        />
        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
        <Stack.Screen
          name="timer"
--- a/app/onboarding/index.tsx
+++ b/app/onboarding/index.tsx
@@ -0,0 +1,49 @@
+import { useRouter, Redirect } from 'expo-router'
+import { Screen1Problem } from '@/src/features/onboarding/screens/Screen1Problem'
+import { Screen2Empathy } from '@/src/features/onboarding/screens/Screen2Empathy'
+import { Screen3Solution } from '@/src/features/onboarding/screens/Screen3Solution'
+import { Screen4WowMoment } from '@/src/features/onboarding/screens/Screen4WowMoment'
+import { Screen5Personalization } from '@/src/features/onboarding/screens/Screen5Personalization'
+import { Screen6Paywall } from '@/src/features/onboarding/screens/Screen6Paywall'
+import { useOnboarding } from '@/src/features/onboarding/hooks/useOnboarding'
+
+export default function OnboardingRouter() {
+  const router = useRouter()
+  const currentStep = useOnboarding((state) => state.currentStep)
+  const isOnboardingComplete = useOnboarding((state) => state.isOnboardingComplete)
+  const nextStep = useOnboarding((state) => state.nextStep)
+  const completeOnboarding = useOnboarding((state) => state.completeOnboarding)
+
+  const handleNext = () => {
+    nextStep()
+  }
+
+  const handleComplete = () => {
+    completeOnboarding()
+    router.replace('/(tabs)')
+  }
+
+  // Redirect to tabs if onboarding is already complete
+  if (isOnboardingComplete) {
+    return <Redirect href="/(tabs)" />
+  }
+
+  // Render the correct screen based on current step
+  switch (currentStep) {
+    case 0:
+      return <Screen1Problem onNext={handleNext} />
+    case 1:
+      return <Screen2Empathy onNext={handleNext} />
+    case 2:
+      return <Screen3Solution onNext={handleNext} />
+    case 3:
+      return <Screen4WowMoment />
+    case 4:
+      return <Screen5Personalization onNext={handleNext} />
+    case 5:
+      return <Screen6Paywall onComplete={handleComplete} />
+    default:
+      // Fallback to first screen if step is out of bounds
+      return <Screen1Problem onNext={handleNext} />
+  }
+}
--- a/app/timer.tsx
+++ b/app/timer.tsx
@@ -1,10 +1,73 @@
+import { useEffect } from 'react'
 import { useRouter } from 'expo-router'
+import * as Haptics from 'expo-haptics'
 import { useTimerEngine } from '@/src/features/timer'
+import { useAudioEngine } from '@/src/features/audio'
 import { TimerDisplay } from '@/src/features/timer/components/TimerDisplay'
+import type { TimerEvent } from '@/src/features/timer/types'

 export default function TimerScreen() {
  const router = useRouter()
  const timer = useTimerEngine()
+  const audio = useAudioEngine()
+
+  // Preload audio on mount
+  useEffect(() => {
+    audio.preloadAll()
+    return () => {
+      audio.unloadAll()
+    }
+  }, [])
+
+  // Subscribe to timer events → trigger audio + haptics
+  useEffect(() => {
+    const unsubscribe = timer.addEventListener(async (event: TimerEvent) => {
+      switch (event.type) {
+        case 'PHASE_CHANGED':
+          await handlePhaseChange(event.to)
+          break
+
+        case 'COUNTDOWN_TICK':
+          await audio.playPhaseSound(
+            event.secondsLeft === 1 ? 'count_1' : event.secondsLeft === 2 ? 'count_2' : 'count_3'
+          )
+          Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+          break
+
+        case 'ROUND_COMPLETED':
+          await audio.playPhaseSound('bell')
+          Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success)
+          break
+
+        case 'SESSION_COMPLETE':
+          await audio.playPhaseSound('fanfare')
+          await audio.stopMusic(1000)
+          Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success)
+          break
+      }
+    })
+
+    return unsubscribe
+  }, [audio.isLoaded])
+
+  async function handlePhaseChange(to: string) {
+    switch (to) {
+      case 'GET_READY':
+        await audio.startMusic('LOW')
+        Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Medium)
+        break
+      case 'WORK':
+        await audio.playPhaseSound('beep_long')
+        await audio.switchIntensity('HIGH')
+        Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Heavy)
+        break
+      case 'REST':
+        await audio.playPhaseSound('beep_double')
+        await audio.switchIntensity('LOW')
+        Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+        break
+    }
+  }

  function handleStart() {
    timer.start()
@@ -12,6 +75,7 @@ export default function TimerScreen() {

  function handleStop() {
    timer.stop()
+    audio.stopMusic(300)
    router.back()
  }

--- a/assets/audio/music/electro_high.mp3
+++ b/assets/audio/music/electro_high.mp3
--- a/assets/audio/music/electro_low.mp3
+++ b/assets/audio/music/electro_low.mp3
--- a/assets/audio/sounds/beep_double.mp3
+++ b/assets/audio/sounds/beep_double.mp3
--- a/assets/audio/sounds/beep_long.mp3
+++ b/assets/audio/sounds/beep_long.mp3
--- a/assets/audio/sounds/beep_short.mp3
+++ b/assets/audio/sounds/beep_short.mp3
--- a/assets/audio/sounds/bell.mp3
+++ b/assets/audio/sounds/bell.mp3
--- a/assets/audio/sounds/count_1.mp3
+++ b/assets/audio/sounds/count_1.mp3
--- a/assets/audio/sounds/count_2.mp3
+++ b/assets/audio/sounds/count_2.mp3
--- a/assets/audio/sounds/count_3.mp3
+++ b/assets/audio/sounds/count_3.mp3
--- a/assets/audio/sounds/fanfare.mp3
+++ b/assets/audio/sounds/fanfare.mp3
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,15 +9,19 @@
      "version": "1.0.0",
      "dependencies": {
        "@expo/vector-icons": "^15.0.3",
+        "@react-native-async-storage/async-storage": "^2.2.0",
        "@react-navigation/bottom-tabs": "^7.4.0",
        "@react-navigation/elements": "^2.6.3",
        "@react-navigation/native": "^7.1.8",
        "expo": "~54.0.33",
+        "expo-av": "~16.0.8",
+        "expo-blur": "~15.0.8",
        "expo-constants": "~18.0.13",
        "expo-font": "~14.0.11",
        "expo-haptics": "~15.0.8",
        "expo-image": "~3.0.11",
        "expo-keep-awake": "~15.0.8",
+        "expo-linear-gradient": "~15.0.8",
        "expo-linking": "~8.0.11",
        "expo-router": "~6.0.23",
        "expo-splash-screen": "~31.0.13",
@@ -33,7 +37,8 @@
        "react-native-safe-area-context": "~5.6.0",
        "react-native-screens": "~4.16.0",
        "react-native-web": "~0.21.0",
-        "react-native-worklets": "0.5.1"
+        "react-native-worklets": "0.5.1",
+        "zustand": "^5.0.11"
      },
      "devDependencies": {
        "@types/react": "~19.1.0",
@@ -2766,6 +2771,18 @@
        }
      }
    },
+    "node_modules/@react-native-async-storage/async-storage": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@react-native-async-storage/async-storage/-/async-storage-2.2.0.tgz",
+      "integrity": "sha512-gvRvjR5JAaUZF8tv2Kcq/Gbt3JHwbKFYfmb445rhOj6NUMx3qPLixmDx5pZAyb9at1bYvJ4/eTUipU5aki45xw==",
+      "license": "MIT",
+      "dependencies": {
+        "merge-options": "^3.0.4"
+      },
+      "peerDependencies": {
+        "react-native": "^0.0.0-0 || >=0.65 <1.0"
+      }
+    },
    "node_modules/@react-native/assets-registry": {
      "version": "0.81.5",
      "resolved": "https://registry.npmjs.org/@react-native/assets-registry/-/assets-registry-0.81.5.tgz",
@@ -6072,6 +6089,34 @@
        "react-native": "*"
      }
    },
+    "node_modules/expo-av": {
+      "version": "16.0.8",
+      "resolved": "https://registry.npmjs.org/expo-av/-/expo-av-16.0.8.tgz",
+      "integrity": "sha512-cmVPftGR/ca7XBgs7R6ky36lF3OC0/MM/lpgX/yXqfv0jASTsh7AYX9JxHCwFmF+Z6JEB1vne9FDx4GiLcGreQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*",
+        "react-native": "*",
+        "react-native-web": "*"
+      },
+      "peerDependenciesMeta": {
+        "react-native-web": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/expo-blur": {
+      "version": "15.0.8",
+      "resolved": "https://registry.npmjs.org/expo-blur/-/expo-blur-15.0.8.tgz",
+      "integrity": "sha512-rWyE1NBRZEu9WD+X+5l7gyPRszw7n12cW3IRNAb5i6KFzaBp8cxqT5oeaphJapqURvcqhkOZn2k5EtBSbsuU7w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*",
+        "react-native": "*"
+      }
+    },
    "node_modules/expo-constants": {
      "version": "18.0.13",
      "resolved": "https://registry.npmjs.org/expo-constants/-/expo-constants-18.0.13.tgz",
@@ -6146,6 +6191,17 @@
        "react": "*"
      }
    },
+    "node_modules/expo-linear-gradient": {
+      "version": "15.0.8",
+      "resolved": "https://registry.npmjs.org/expo-linear-gradient/-/expo-linear-gradient-15.0.8.tgz",
+      "integrity": "sha512-V2d8Wjn0VzhPHO+rrSBtcl+Fo+jUUccdlmQ6OoL9/XQB7Qk3d9lYrqKDJyccwDxmQT10JdST3Tmf2K52NLc3kw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*",
+        "react-native": "*"
+      }
+    },
    "node_modules/expo-linking": {
      "version": "8.0.11",
      "resolved": "https://registry.npmjs.org/expo-linking/-/expo-linking-8.0.11.tgz",
@@ -7842,6 +7898,15 @@
        "url": "https://github.com/sponsors/ljharb"
      }
    },
+    "node_modules/is-plain-obj": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
+      "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
    "node_modules/is-regex": {
      "version": "1.2.1",
      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.2.1.tgz",
@@ -8835,6 +8900,18 @@
      "integrity": "sha512-zYiwtZUcYyXKo/np96AGZAckk+FWWsUdJ3cHGGmld7+AhvcWmQyGCYUh1hc4Q/pkOhb65dQR/pqCyK0cOaHz4Q==",
      "license": "MIT"
    },
+    "node_modules/merge-options": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/merge-options/-/merge-options-3.0.4.tgz",
+      "integrity": "sha512-2Sug1+knBjkaMsMgf1ctR1Ujx+Ayku4EdJN4Z+C2+JzoeF7A3OZ9KM2GY0CpQS51NR61LTurMJrRKPhSs3ZRTQ==",
+      "license": "MIT",
+      "dependencies": {
+        "is-plain-obj": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
    "node_modules/merge-stream": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
@@ -12889,6 +12966,35 @@
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
+    },
+    "node_modules/zustand": {
+      "version": "5.0.11",
+      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.11.tgz",
+      "integrity": "sha512-fdZY+dk7zn/vbWNCYmzZULHRrss0jx5pPFiOuMZ/5HJN6Yv3u+1Wswy/4MpZEkEGhtNH+pwxZB8OKgUBPzYAGg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      },
+      "peerDependencies": {
+        "@types/react": ">=18.0.0",
+        "immer": ">=9.0.6",
+        "react": ">=18.0.0",
+        "use-sync-external-store": ">=1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "immer": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "use-sync-external-store": {
+          "optional": true
+        }
+      }
    }
  }
 }
--- a/package.json
+++ b/package.json
@@ -12,15 +12,19 @@
  },
  "dependencies": {
    "@expo/vector-icons": "^15.0.3",
+    "@react-native-async-storage/async-storage": "^2.2.0",
    "@react-navigation/bottom-tabs": "^7.4.0",
    "@react-navigation/elements": "^2.6.3",
    "@react-navigation/native": "^7.1.8",
    "expo": "~54.0.33",
+    "expo-av": "~16.0.8",
+    "expo-blur": "~15.0.8",
    "expo-constants": "~18.0.13",
    "expo-font": "~14.0.11",
    "expo-haptics": "~15.0.8",
    "expo-image": "~3.0.11",
    "expo-keep-awake": "~15.0.8",
+    "expo-linear-gradient": "~15.0.8",
    "expo-linking": "~8.0.11",
    "expo-router": "~6.0.23",
    "expo-splash-screen": "~31.0.13",
@@ -36,13 +40,14 @@
    "react-native-safe-area-context": "~5.6.0",
    "react-native-screens": "~4.16.0",
    "react-native-web": "~0.21.0",
-    "react-native-worklets": "0.5.1"
+    "react-native-worklets": "0.5.1",
+    "zustand": "^5.0.11"
  },
  "devDependencies": {
    "@types/react": "~19.1.0",
-    "typescript": "~5.9.2",
    "eslint": "^9.25.0",
-    "eslint-config-expo": "~10.0.0"
+    "eslint-config-expo": "~10.0.0",
+    "typescript": "~5.9.2"
  },
  "private": true
 }
--- a/src/features/audio/data/sounds.ts
+++ b/src/features/audio/data/sounds.ts
@@ -0,0 +1,13 @@
+import type { PhaseSound } from '../types'
+
+/* eslint-disable @typescript-eslint/no-require-imports */
+export const PHASE_SOUNDS: Record<PhaseSound, number> = {
+  beep_long: require('@/assets/audio/sounds/beep_long.mp3'),
+  beep_double: require('@/assets/audio/sounds/beep_double.mp3'),
+  beep_short: require('@/assets/audio/sounds/beep_short.mp3'),
+  bell: require('@/assets/audio/sounds/bell.mp3'),
+  fanfare: require('@/assets/audio/sounds/fanfare.mp3'),
+  count_3: require('@/assets/audio/sounds/count_3.mp3'),
+  count_2: require('@/assets/audio/sounds/count_2.mp3'),
+  count_1: require('@/assets/audio/sounds/count_1.mp3'),
+}
--- a/src/features/audio/data/tracks.ts
+++ b/src/features/audio/data/tracks.ts
@@ -0,0 +1,27 @@
+import type { MusicIntensity } from '../types'
+
+interface MusicTrack {
+  id: string
+  intensity: MusicIntensity
+  asset: number
+}
+
+/* eslint-disable @typescript-eslint/no-require-imports */
+export const TRACKS: MusicTrack[] = [
+  {
+    id: 'electro_high',
+    intensity: 'HIGH',
+    asset: require('@/assets/audio/music/electro_high.mp3'),
+  },
+  {
+    id: 'electro_low',
+    intensity: 'LOW',
+    asset: require('@/assets/audio/music/electro_low.mp3'),
+  },
+]
+
+export function getTrack(intensity: MusicIntensity): MusicTrack {
+  const track = TRACKS.find((t) => t.intensity === intensity)
+  if (!track) throw new Error(`Track not found: ${intensity}`)
+  return track
+}
--- a/src/features/audio/hooks/useAudioEngine.ts
+++ b/src/features/audio/hooks/useAudioEngine.ts
@@ -0,0 +1,173 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+import { Audio } from 'expo-av'
+import type { AudioEngine, MusicIntensity, PhaseSound } from '../types'
+import { PHASE_SOUNDS } from '../data/sounds'
+import { getTrack } from '../data/tracks'
+
+const FADE_STEPS = 10
+
+async function delay(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms))
+}
+
+export function useAudioEngine(): AudioEngine {
+  const [isLoaded, setIsLoaded] = useState(false)
+  const soundsRef = useRef<Record<string, Audio.Sound>>({})
+  const currentIntensityRef = useRef<MusicIntensity>('LOW')
+  const musicVolumeRef = useRef(0.5)
+
+  // Configure audio session once
+  useEffect(() => {
+    Audio.setAudioModeAsync({
+      playsInSilentModeIOS: true,
+      allowsRecordingIOS: false,
+      staysActiveInBackground: true,
+      shouldDuckAndroid: true,
+      playThroughEarpieceAndroid: false,
+    }).catch((e) => {
+      if (__DEV__) console.warn('[AudioEngine] Failed to configure audio session:', e)
+    })
+  }, [])
+
+  const preloadAll = useCallback(async () => {
+    try {
+      // Preload phase sounds
+      for (const [key, asset] of Object.entries(PHASE_SOUNDS)) {
+        const { sound } = await Audio.Sound.createAsync(asset, {
+          shouldPlay: false,
+          volume: 1.0,
+        })
+        soundsRef.current[key] = sound
+      }
+
+      // Preload music tracks
+      const highTrack = getTrack('HIGH')
+      const lowTrack = getTrack('LOW')
+
+      const { sound: musicHigh } = await Audio.Sound.createAsync(highTrack.asset, {
+        shouldPlay: false,
+        volume: 0,
+        isLooping: true,
+      })
+      soundsRef.current['music_high'] = musicHigh
+
+      const { sound: musicLow } = await Audio.Sound.createAsync(lowTrack.asset, {
+        shouldPlay: false,
+        volume: 0,
+        isLooping: true,
+      })
+      soundsRef.current['music_low'] = musicLow
+
+      setIsLoaded(true)
+      if (__DEV__) console.log('[AudioEngine] All sounds preloaded')
+    } catch (e) {
+      if (__DEV__) console.warn('[AudioEngine] Preload error:', e)
+    }
+  }, [])
+
+  const playPhaseSound = useCallback(async (sound: PhaseSound) => {
+    const s = soundsRef.current[sound]
+    if (!s) return
+    try {
+      await s.setPositionAsync(0)
+      await s.playAsync()
+    } catch (e) {
+      if (__DEV__) console.warn('[AudioEngine] Play error:', sound, e)
+    }
+  }, [])
+
+  const startMusic = useCallback(async (intensity: MusicIntensity) => {
+    const key = intensity === 'HIGH' ? 'music_high' : 'music_low'
+    const s = soundsRef.current[key]
+    if (!s) return
+    try {
+      currentIntensityRef.current = intensity
+      await s.setPositionAsync(0)
+      await s.setVolumeAsync(musicVolumeRef.current)
+      await s.playAsync()
+    } catch (e) {
+      if (__DEV__) console.warn('[AudioEngine] startMusic error:', e)
+    }
+  }, [])
+
+  const switchIntensity = useCallback(async (to: MusicIntensity) => {
+    const from = currentIntensityRef.current
+    if (from === to) return
+
+    const outKey = from === 'HIGH' ? 'music_high' : 'music_low'
+    const inKey = to === 'HIGH' ? 'music_high' : 'music_low'
+    const outSound = soundsRef.current[outKey]
+    const inSound = soundsRef.current[inKey]
+
+    if (!outSound || !inSound) return
+
+    try {
+      const vol = musicVolumeRef.current
+      await inSound.setPositionAsync(0)
+      await inSound.setVolumeAsync(0)
+      await inSound.playAsync()
+
+      // Crossfade
+      const stepMs = 500 / FADE_STEPS
+      for (let i = 1; i <= FADE_STEPS; i++) {
+        const progress = i / FADE_STEPS
+        await Promise.all([
+          outSound.setVolumeAsync(vol * (1 - progress)),
+          inSound.setVolumeAsync(vol * progress),
+        ])
+        await delay(stepMs)
+      }
+
+      await outSound.stopAsync()
+      currentIntensityRef.current = to
+    } catch (e) {
+      if (__DEV__) console.warn('[AudioEngine] switchIntensity error:', e)
+    }
+  }, [])
+
+  const stopMusic = useCallback(async (fadeMs: number = 500) => {
+    const key = currentIntensityRef.current === 'HIGH' ? 'music_high' : 'music_low'
+    const s = soundsRef.current[key]
+    if (!s) return
+
+    try {
+      const stepMs = fadeMs / FADE_STEPS
+      for (let i = FADE_STEPS; i >= 0; i--) {
+        await s.setVolumeAsync(musicVolumeRef.current * (i / FADE_STEPS))
+        await delay(stepMs)
+      }
+      await s.stopAsync()
+    } catch (e) {
+      if (__DEV__) console.warn('[AudioEngine] stopMusic error:', e)
+    }
+  }, [])
+
+  const unloadAll = useCallback(async () => {
+    await Promise.all(
+      Object.values(soundsRef.current).map((s) =>
+        s.unloadAsync().catch(() => {})
+      )
+    )
+    soundsRef.current = {}
+    setIsLoaded(false)
+  }, [])
+
+  // Cleanup on unmount
+  useEffect(() => {
+    return () => {
+      Object.values(soundsRef.current).forEach((s) => {
+        s.unloadAsync().catch(() => {})
+      })
+    }
+  }, [])
+
+  return {
+    isLoaded,
+    preloadAll,
+    playPhaseSound,
+    startMusic,
+    switchIntensity,
+    stopMusic,
+    unloadAll,
+  }
+}
--- a/src/features/audio/index.ts
+++ b/src/features/audio/index.ts
@@ -0,0 +1,8 @@
+export { useAudioEngine } from './hooks/useAudioEngine'
+export type {
+  MusicAmbiance,
+  MusicIntensity,
+  PhaseSound,
+  AudioSettings,
+  AudioEngine,
+} from './types'
--- a/src/features/audio/types.ts
+++ b/src/features/audio/types.ts
@@ -0,0 +1,31 @@
+export type MusicAmbiance = 'ELECTRO' | 'SILENCE'
+export type MusicIntensity = 'LOW' | 'HIGH'
+
+export type PhaseSound =
+  | 'beep_long'
+  | 'beep_double'
+  | 'beep_short'
+  | 'bell'
+  | 'fanfare'
+  | 'count_3'
+  | 'count_2'
+  | 'count_1'
+
+export interface AudioSettings {
+  musicEnabled: boolean
+  ambiance: MusicAmbiance
+  musicVolume: number
+  soundsEnabled: boolean
+  soundsVolume: number
+  hapticsEnabled: boolean
+}
+
+export interface AudioEngine {
+  isLoaded: boolean
+  preloadAll: () => Promise<void>
+  playPhaseSound: (sound: PhaseSound) => Promise<void>
+  startMusic: (intensity: MusicIntensity) => Promise<void>
+  switchIntensity: (intensity: MusicIntensity) => Promise<void>
+  stopMusic: (fadeMs?: number) => Promise<void>
+  unloadAll: () => Promise<void>
+}
--- a/src/features/onboarding/components/ChoiceButton.tsx
+++ b/src/features/onboarding/components/ChoiceButton.tsx
@@ -0,0 +1,100 @@
+import { StyleSheet, View, Text, Pressable } from 'react-native'
+import { Ionicons } from '@expo/vector-icons'
+import { BRAND, GLASS, TEXT, BORDER, SURFACE } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+interface ChoiceButtonProps {
+  label: string
+  description?: string
+  icon: keyof typeof Ionicons.glyphMap
+  selected: boolean
+  onPress: () => void
+}
+
+export function ChoiceButton({
+  label,
+  description,
+  icon,
+  selected,
+  onPress,
+}: ChoiceButtonProps) {
+  return (
+    <Pressable onPress={onPress} style={styles.pressable}>
+      <View style={[styles.container, selected && styles.containerSelected]}>
+        <View style={[styles.iconContainer, selected && styles.iconContainerSelected]}>
+          <Ionicons
+            name={icon}
+            size={24}
+            color={selected ? BRAND.PRIMARY : TEXT.MUTED}
+          />
+        </View>
+        <View style={styles.textContainer}>
+          <Text style={[styles.label, selected && styles.labelSelected]}>
+            {label}
+          </Text>
+          {description && (
+            <Text style={styles.description}>{description}</Text>
+          )}
+        </View>
+        {selected && (
+          <View style={styles.checkmark}>
+            <Ionicons name="checkmark-circle" size={24} color={BRAND.PRIMARY} />
+          </View>
+        )}
+      </View>
+    </Pressable>
+  )
+}
+
+const styles = StyleSheet.create({
+  pressable: {
+    width: '100%',
+  },
+  container: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    backgroundColor: GLASS.FILL,
+    borderWidth: 1,
+    borderColor: GLASS.BORDER,
+    borderRadius: RADIUS.LG,
+    paddingVertical: SPACING[4],
+    paddingHorizontal: SPACING[4],
+    gap: SPACING[3],
+  },
+  containerSelected: {
+    backgroundColor: SURFACE.OVERLAY_LIGHT,
+    borderColor: BRAND.PRIMARY,
+    borderWidth: 2,
+  },
+  iconContainer: {
+    width: 48,
+    height: 48,
+    borderRadius: RADIUS.MD,
+    backgroundColor: SURFACE.OVERLAY_LIGHT,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  iconContainerSelected: {
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
+  },
+  textContainer: {
+    flex: 1,
+  },
+  label: {
+    ...TYPOGRAPHY.body,
+    color: TEXT.PRIMARY,
+  },
+  labelSelected: {
+    color: BRAND.PRIMARY,
+  },
+  description: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.MUTED,
+    marginTop: 4,
+  },
+  checkmark: {
+    marginLeft: SPACING[2],
+  },
+})
--- a/src/features/onboarding/components/MiniTimerDemo.tsx
+++ b/src/features/onboarding/components/MiniTimerDemo.tsx
@@ -0,0 +1,178 @@
+import { useEffect, useRef, useState } from 'react'
+import { StyleSheet, View, Text, Animated } from 'react-native'
+import { useTimerEngine } from '@/src/features/timer/hooks/useTimerEngine'
+import { PHASE_COLORS, TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+interface MiniTimerDemoProps {
+  onComplete?: () => void
+  onPhaseChange?: (phase: string) => void
+  onCountdownTick?: (seconds: number) => void
+  autoStartDelay?: number
+}
+
+export function MiniTimerDemo({
+  onComplete,
+  onPhaseChange,
+  onCountdownTick,
+  autoStartDelay = 500,
+}: MiniTimerDemoProps) {
+  const timer = useTimerEngine()
+  const [hasCompleted, setHasCompleted] = useState(false)
+  const pulseAnim = useRef(new Animated.Value(1)).current
+  const glowAnim = useRef(new Animated.Value(0)).current
+
+  useEffect(() => {
+    // Auto-start after a short delay
+    const startTimeout = setTimeout(() => {
+      timer.start({
+        workDuration: 20,
+        restDuration: 0,
+        rounds: 1,
+        getReadyDuration: 3,
+        cycles: 1,
+      })
+    }, autoStartDelay)
+
+    return () => clearTimeout(startTimeout)
+  }, [timer, autoStartDelay])
+
+  useEffect(() => {
+    // Listen for all timer events
+    const unsubscribe = timer.addEventListener((event) => {
+      switch (event.type) {
+        case 'SESSION_COMPLETE':
+          setHasCompleted(true)
+          onComplete?.()
+          break
+        case 'PHASE_CHANGED':
+          onPhaseChange?.(event.to)
+          break
+        case 'COUNTDOWN_TICK':
+          onCountdownTick?.(event.secondsLeft)
+          break
+      }
+    })
+
+    return unsubscribe
+  }, [timer, onComplete, onPhaseChange, onCountdownTick])
+
+  useEffect(() => {
+    // Pulse animation when running
+    if (timer.isRunning) {
+      Animated.loop(
+        Animated.sequence([
+          Animated.timing(pulseAnim, {
+            toValue: 1.05,
+            duration: 800,
+            useNativeDriver: true,
+          }),
+          Animated.timing(pulseAnim, {
+            toValue: 1,
+            duration: 800,
+            useNativeDriver: true,
+          }),
+        ])
+      ).start()
+    } else {
+      pulseAnim.setValue(1)
+    }
+  }, [timer.isRunning, pulseAnim])
+
+  useEffect(() => {
+    // Glow animation
+    Animated.loop(
+      Animated.sequence([
+        Animated.timing(glowAnim, {
+          toValue: 1,
+          duration: 1500,
+          useNativeDriver: true,
+        }),
+        Animated.timing(glowAnim, {
+          toValue: 0,
+          duration: 1500,
+          useNativeDriver: true,
+        }),
+      ])
+    ).start()
+  }, [glowAnim])
+
+  const getPhaseText = (): string => {
+    if (hasCompleted) return 'DONE!'
+    if (timer.phase === 'GET_READY') return 'GET READY'
+    if (timer.phase === 'WORK') return 'GO!'
+    if (timer.phase === 'COMPLETE') return 'DONE!'
+    return ''
+  }
+
+  const phaseColor = PHASE_COLORS[timer.phase] || PHASE_COLORS.IDLE
+  const displaySeconds = timer.secondsLeft > 0 ? timer.secondsLeft : 0
+
+  return (
+    <View style={styles.container}>
+      <Animated.View
+        style={[
+          styles.timerCircle,
+          { borderColor: phaseColor },
+          { transform: [{ scale: pulseAnim }] },
+        ]}
+      >
+        <Animated.View
+          style={[
+            styles.glowOverlay,
+            {
+              backgroundColor: phaseColor,
+              opacity: glowAnim.interpolate({
+                inputRange: [0, 1],
+                outputRange: [0.05, 0.15],
+              }),
+            },
+          ]}
+        />
+        <Text style={[styles.countdown, { color: phaseColor }]}>
+          {displaySeconds}
+        </Text>
+        <Text style={[styles.phaseText, { color: phaseColor }]}>
+          {getPhaseText()}
+        </Text>
+      </Animated.View>
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    alignItems: 'center',
+    justifyContent: 'center',
+    paddingVertical: SPACING[6],
+  },
+  timerCircle: {
+    width: 200,
+    height: 200,
+    borderRadius: 100,
+    borderWidth: 4,
+    alignItems: 'center',
+    justifyContent: 'center',
+    backgroundColor: 'rgba(0, 0, 0, 0.3)',
+    overflow: 'hidden',
+  },
+  glowOverlay: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    right: 0,
+    bottom: 0,
+    borderRadius: 100,
+  },
+  countdown: {
+    ...TYPOGRAPHY.timeDisplay,
+    fontVariant: ['tabular-nums'],
+  },
+  phaseText: {
+    ...TYPOGRAPHY.label,
+    marginTop: SPACING[2],
+    letterSpacing: 3,
+  },
+})
--- a/src/features/onboarding/components/OnboardingScreen.tsx
+++ b/src/features/onboarding/components/OnboardingScreen.tsx
@@ -0,0 +1,46 @@
+import { ReactNode } from 'react'
+import { StyleSheet, View, SafeAreaView } from 'react-native'
+import { LinearGradient } from 'expo-linear-gradient'
+import { APP_GRADIENTS } from '@/src/shared/constants/colors'
+import { LAYOUT, SPACING } from '@/src/shared/constants/spacing'
+import { ProgressBar } from './ProgressBar'
+
+interface OnboardingScreenProps {
+  children: ReactNode
+  currentStep: number
+  totalSteps?: number
+}
+
+export function OnboardingScreen({
+  children,
+  currentStep,
+  totalSteps = 6,
+}: OnboardingScreenProps) {
+  return (
+    <LinearGradient
+      colors={APP_GRADIENTS.HOME}
+      style={styles.gradient}
+      start={{ x: 0, y: 0 }}
+      end={{ x: 1, y: 1 }}
+    >
+      <SafeAreaView style={styles.container}>
+        <ProgressBar currentStep={currentStep} totalSteps={totalSteps} />
+        <View style={styles.content}>{children}</View>
+      </SafeAreaView>
+    </LinearGradient>
+  )
+}
+
+const styles = StyleSheet.create({
+  gradient: {
+    flex: 1,
+  },
+  container: {
+    flex: 1,
+  },
+  content: {
+    flex: 1,
+    paddingHorizontal: LAYOUT.PAGE_HORIZONTAL,
+    paddingBottom: SPACING[6],
+  },
+})
--- a/src/features/onboarding/components/PaywallCard.tsx
+++ b/src/features/onboarding/components/PaywallCard.tsx
@@ -0,0 +1,158 @@
+import { StyleSheet, View, Text, Pressable } from 'react-native'
+import { BRAND, GLASS, TEXT, SURFACE, BORDER } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+interface PaywallCardProps {
+  title: string
+  price: string
+  period: string
+  features: string[]
+  selected: boolean
+  onPress: () => void
+  badge?: string
+}
+
+export function PaywallCard({
+  title,
+  price,
+  period,
+  features,
+  selected,
+  onPress,
+  badge,
+}: PaywallCardProps) {
+  return (
+    <Pressable onPress={onPress} style={styles.pressable}>
+      <View style={[styles.container, selected && styles.containerSelected]}>
+        {badge && (
+          <View style={styles.badge}>
+            <Text style={styles.badgeText}>{badge}</Text>
+          </View>
+        )}
+        <View style={styles.header}>
+          <Text style={[styles.title, selected && styles.titleSelected]}>
+            {title}
+          </Text>
+          <View style={styles.priceRow}>
+            <Text style={styles.price}>{price}</Text>
+            <Text style={styles.period}>/{period}</Text>
+          </View>
+        </View>
+        <View style={styles.divider} />
+        <View style={styles.features}>
+          {features.map((feature, index) => (
+            <View key={index} style={styles.featureRow}>
+              <View style={styles.featureDot} />
+              <Text style={styles.featureText}>{feature}</Text>
+            </View>
+          ))}
+        </View>
+        {selected && (
+          <View style={styles.selectedIndicator}>
+            <View style={styles.selectedDot} />
+          </View>
+        )}
+      </View>
+    </Pressable>
+  )
+}
+
+const styles = StyleSheet.create({
+  pressable: {
+    width: '100%',
+  },
+  container: {
+    backgroundColor: GLASS.FILL_MEDIUM,
+    borderWidth: 1,
+    borderColor: GLASS.BORDER,
+    borderRadius: RADIUS.XL,
+    padding: SPACING[4],
+    position: 'relative',
+    overflow: 'hidden',
+  },
+  containerSelected: {
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
+    borderColor: BRAND.PRIMARY,
+    borderWidth: 2,
+  },
+  badge: {
+    position: 'absolute',
+    top: 0,
+    right: 0,
+    backgroundColor: BRAND.PRIMARY,
+    paddingHorizontal: SPACING[3],
+    paddingVertical: SPACING[1.5],
+    borderBottomLeftRadius: RADIUS.MD,
+  },
+  badgeText: {
+    ...TYPOGRAPHY.overline,
+    color: TEXT.PRIMARY,
+    fontWeight: '700',
+  },
+  header: {
+    marginBottom: SPACING[3],
+  },
+  title: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.PRIMARY,
+    marginBottom: SPACING[2],
+  },
+  titleSelected: {
+    color: BRAND.PRIMARY,
+  },
+  priceRow: {
+    flexDirection: 'row',
+    alignItems: 'baseline',
+  },
+  price: {
+    ...TYPOGRAPHY.displaySmall,
+    color: TEXT.PRIMARY,
+    fontWeight: '900',
+  },
+  period: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.MUTED,
+    marginLeft: SPACING[1],
+  },
+  divider: {
+    height: 1,
+    backgroundColor: BORDER.LIGHT,
+    marginBottom: SPACING[3],
+  },
+  features: {
+    gap: SPACING[2],
+  },
+  featureRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: SPACING[2],
+  },
+  featureDot: {
+    width: 6,
+    height: 6,
+    borderRadius: 3,
+    backgroundColor: BRAND.PRIMARY,
+  },
+  featureText: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.SECONDARY,
+  },
+  selectedIndicator: {
+    position: 'absolute',
+    top: SPACING[3],
+    left: SPACING[3],
+  },
+  selectedDot: {
+    width: 12,
+    height: 12,
+    borderRadius: 6,
+    backgroundColor: BRAND.PRIMARY,
+    shadowColor: BRAND.PRIMARY,
+    shadowOffset: { width: 0, height: 0 },
+    shadowOpacity: 0.6,
+    shadowRadius: 6,
+    elevation: 3,
+  },
+})
--- a/src/features/onboarding/components/PrimaryButton.tsx
+++ b/src/features/onboarding/components/PrimaryButton.tsx
@@ -0,0 +1,85 @@
+import { StyleSheet, Text, Pressable, Animated } from 'react-native'
+import { BRAND, TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+
+interface PrimaryButtonProps {
+  title: string
+  onPress: () => void
+  disabled?: boolean
+}
+
+export function PrimaryButton({
+  title,
+  onPress,
+  disabled = false,
+}: PrimaryButtonProps) {
+  const animatedValue = new Animated.Value(1)
+
+  const handlePressIn = () => {
+    Animated.spring(animatedValue, {
+      toValue: 0.96,
+      useNativeDriver: true,
+    }).start()
+  }
+
+  const handlePressOut = () => {
+    Animated.spring(animatedValue, {
+      toValue: 1,
+      friction: 3,
+      useNativeDriver: true,
+    }).start()
+  }
+
+  return (
+    <Pressable
+      onPress={onPress}
+      onPressIn={handlePressIn}
+      onPressOut={handlePressOut}
+      disabled={disabled}
+      style={{ width: '100%' }}
+    >
+      <Animated.View
+        style={[
+          styles.button,
+          disabled && styles.buttonDisabled,
+          { transform: [{ scale: animatedValue }] },
+        ]}
+      >
+        <Text style={[styles.text, disabled && styles.textDisabled]}>
+          {title}
+        </Text>
+      </Animated.View>
+    </Pressable>
+  )
+}
+
+const styles = StyleSheet.create({
+  button: {
+    backgroundColor: BRAND.PRIMARY,
+    borderRadius: RADIUS['2XL'],
+    paddingVertical: 18,
+    paddingHorizontal: 32,
+    alignItems: 'center',
+    justifyContent: 'center',
+    shadowColor: BRAND.PRIMARY,
+    shadowOffset: { width: 0, height: 4 },
+    shadowOpacity: 0.4,
+    shadowRadius: 12,
+    elevation: 8,
+  },
+  buttonDisabled: {
+    backgroundColor: BRAND.PRIMARY,
+    opacity: 0.5,
+    shadowOpacity: 0,
+    elevation: 0,
+  },
+  text: {
+    ...TYPOGRAPHY.buttonMedium,
+    color: TEXT.PRIMARY,
+  },
+  textDisabled: {
+    color: TEXT.PRIMARY,
+    opacity: 0.7,
+  },
+})
--- a/src/features/onboarding/components/ProgressBar.tsx
+++ b/src/features/onboarding/components/ProgressBar.tsx
@@ -0,0 +1,89 @@
+import { useEffect, useRef } from 'react'
+import { StyleSheet, View, Animated } from 'react-native'
+import { BRAND, SURFACE } from '@/src/shared/constants/colors'
+
+interface ProgressBarProps {
+  currentStep: number
+  totalSteps?: number
+}
+
+export function ProgressBar({
+  currentStep,
+  totalSteps = 6,
+}: ProgressBarProps) {
+  const scaleAnims = useRef(
+    Array.from({ length: totalSteps }, () => new Animated.Value(1))
+  ).current
+
+  useEffect(() => {
+    // Animate the newly active dot
+    if (currentStep >= 0 && currentStep < totalSteps) {
+      Animated.sequence([
+        Animated.timing(scaleAnims[currentStep], {
+          toValue: 1.3,
+          duration: 150,
+          useNativeDriver: true,
+        }),
+        Animated.timing(scaleAnims[currentStep], {
+          toValue: 1,
+          duration: 150,
+          useNativeDriver: true,
+        }),
+      ]).start()
+    }
+  }, [currentStep, totalSteps, scaleAnims])
+
+  return (
+    <View style={styles.container}>
+      {Array.from({ length: totalSteps }).map((_, index) => {
+        const isActive = index === currentStep
+        const isCompleted = index < currentStep
+
+        return (
+          <Animated.View
+            key={index}
+            style={[
+              styles.dot,
+              isActive && styles.dotActive,
+              isCompleted && styles.dotCompleted,
+              { transform: [{ scale: scaleAnims[index] }] },
+            ]}
+          />
+        )
+      })}
+    </View>
+  )
+}
+
+const DOT_SIZE = 10
+const DOT_SIZE_ACTIVE = 12
+
+const styles = StyleSheet.create({
+  container: {
+    flexDirection: 'row',
+    justifyContent: 'center',
+    alignItems: 'center',
+    gap: 12,
+    paddingVertical: 16,
+  },
+  dot: {
+    width: DOT_SIZE,
+    height: DOT_SIZE,
+    borderRadius: DOT_SIZE / 2,
+    backgroundColor: SURFACE.OVERLAY_LIGHT,
+  },
+  dotActive: {
+    width: DOT_SIZE_ACTIVE,
+    height: DOT_SIZE_ACTIVE,
+    borderRadius: DOT_SIZE_ACTIVE / 2,
+    backgroundColor: BRAND.PRIMARY,
+    shadowColor: BRAND.PRIMARY,
+    shadowOffset: { width: 0, height: 0 },
+    shadowOpacity: 0.8,
+    shadowRadius: 8,
+    elevation: 4,
+  },
+  dotCompleted: {
+    backgroundColor: BRAND.PRIMARY,
+  },
+})
--- a/src/features/onboarding/components/index.ts
+++ b/src/features/onboarding/components/index.ts
@@ -0,0 +1,6 @@
+export { OnboardingScreen } from './OnboardingScreen'
+export { ProgressBar } from './ProgressBar'
+export { PrimaryButton } from './PrimaryButton'
+export { ChoiceButton } from './ChoiceButton'
+export { MiniTimerDemo } from './MiniTimerDemo'
+export { PaywallCard } from './PaywallCard'
--- a/src/features/onboarding/data/barriers.ts
+++ b/src/features/onboarding/data/barriers.ts
@@ -0,0 +1,15 @@
+import type { Barrier } from '../types'
+
+export interface BarrierOption {
+  id: Barrier
+  label: string
+  description: string
+  icon: string // Ionicons name
+}
+
+export const BARRIERS: BarrierOption[] = [
+  { id: 'time', label: 'Le temps', description: 'Je n\'ai pas assez de temps', icon: 'time-outline' },
+  { id: 'motivation', label: 'La motivation', description: 'Je n\'arrive pas à rester motivé(e)', icon: 'flash-outline' },
+  { id: 'knowledge', label: 'Le savoir', description: 'Je ne sais pas quoi faire', icon: 'book-outline' },
+  { id: 'gym', label: 'La salle', description: 'Je n\'ai pas accès à une salle', icon: 'barbell-outline' },
+]
--- a/src/features/onboarding/data/goals.ts
+++ b/src/features/onboarding/data/goals.ts
@@ -0,0 +1,15 @@
+import type { Goal } from '../types'
+
+export interface GoalOption {
+  id: Goal
+  label: string
+  description: string
+  icon: string
+}
+
+export const GOALS: GoalOption[] = [
+  { id: 'weight_loss', label: 'Perte de poids', description: 'Brûler des graisses efficacement', icon: 'flame-outline' },
+  { id: 'cardio', label: 'Cardio', description: 'Améliorer mon endurance', icon: 'heart-outline' },
+  { id: 'strength', label: 'Force', description: 'Développer ma musculature', icon: 'barbell-outline' },
+  { id: 'wellness', label: 'Bien-être', description: 'Me sentir mieux dans mon corps', icon: 'happy-outline' },
+]
--- a/src/features/onboarding/data/index.ts
+++ b/src/features/onboarding/data/index.ts
@@ -0,0 +1,5 @@
+// Barrel export for onboarding data
+
+export { BARRIERS, type BarrierOption } from './barriers'
+export { GOALS, type GoalOption } from './goals'
+export { LEVELS, type LevelOption } from './levels'
--- a/src/features/onboarding/data/levels.ts
+++ b/src/features/onboarding/data/levels.ts
@@ -0,0 +1,14 @@
+import type { Level } from '../types'
+
+export interface LevelOption {
+  id: Level
+  label: string
+  description: string
+  icon: string
+}
+
+export const LEVELS: LevelOption[] = [
+  { id: 'beginner', label: 'Débutant', description: 'Je commence le sport', icon: 'leaf-outline' },
+  { id: 'intermediate', label: 'Intermédiaire', description: 'Je fais du sport régulièrement', icon: 'fitness-outline' },
+  { id: 'advanced', label: 'Avancé', description: 'Je suis très actif(ve)', icon: 'trophy-outline' },
+]
--- a/src/features/onboarding/hooks/useOnboarding.ts
+++ b/src/features/onboarding/hooks/useOnboarding.ts
@@ -0,0 +1,137 @@
+import { create } from 'zustand'
+import {
+  createJSONStorage,
+  persist,
+  type StateStorage,
+} from 'zustand/middleware'
+import AsyncStorage from '@react-native-async-storage/async-storage'
+import type {
+  Barrier,
+  Frequency,
+  Goal,
+  Level,
+  OnboardingData,
+  OnboardingState,
+} from '../types'
+
+const STORAGE_KEY_COMPLETE = 'tabatago_onboarding_complete'
+const STORAGE_KEY_DATA = 'tabatago_onboarding_data'
+
+// Custom storage that uses AsyncStorage
+const onboardingStorage: StateStorage = {
+  getItem: async (name: string): Promise<string | null> => {
+    return await AsyncStorage.getItem(name)
+  },
+  setItem: async (name: string, value: string): Promise<void> => {
+    await AsyncStorage.setItem(name, value)
+  },
+  removeItem: async (name: string): Promise<void> => {
+    await AsyncStorage.removeItem(name)
+  },
+}
+
+const initialData: OnboardingData = {
+  barrier: null,
+  level: null,
+  goal: null,
+  frequency: null,
+}
+
+interface OnboardingActions {
+  setStep: (step: number) => void
+  nextStep: () => void
+  prevStep: () => void
+  setData: (data: Partial<OnboardingData>) => void
+  setBarrier: (barrier: Barrier) => void
+  setLevel: (level: Level) => void
+  setGoal: (goal: Goal) => void
+  setFrequency: (frequency: Frequency) => void
+  completeOnboarding: () => void
+  resetOnboarding: () => void
+}
+
+type OnboardingStore = OnboardingState & OnboardingActions
+
+export const useOnboarding = create<OnboardingStore>()(
+  persist(
+    (set, get) => ({
+      // Initial state
+      currentStep: 0,
+      isOnboardingComplete: false,
+      data: initialData,
+
+      // Actions
+      setStep: (step: number) => {
+        set({ currentStep: step })
+      },
+
+      nextStep: () => {
+        const { currentStep } = get()
+        set({ currentStep: currentStep + 1 })
+      },
+
+      prevStep: () => {
+        const { currentStep } = get()
+        if (currentStep > 0) {
+          set({ currentStep: currentStep - 1 })
+        }
+      },
+
+      setData: (data: Partial<OnboardingData>) => {
+        set((state) => ({
+          data: { ...state.data, ...data },
+        }))
+      },
+
+      setBarrier: (barrier: Barrier) => {
+        set((state) => ({
+          data: { ...state.data, barrier },
+        }))
+      },
+
+      setLevel: (level: Level) => {
+        set((state) => ({
+          data: { ...state.data, level },
+        }))
+      },
+
+      setGoal: (goal: Goal) => {
+        set((state) => ({
+          data: { ...state.data, goal },
+        }))
+      },
+
+      setFrequency: (frequency: Frequency) => {
+        set((state) => ({
+          data: { ...state.data, frequency },
+        }))
+      },
+
+      completeOnboarding: () => {
+        set({ isOnboardingComplete: true })
+      },
+
+      resetOnboarding: () => {
+        set({
+          currentStep: 0,
+          isOnboardingComplete: false,
+          data: initialData,
+        })
+      },
+    }),
+    {
+      name: STORAGE_KEY_DATA,
+      storage: createJSONStorage(() => onboardingStorage),
+      partialize: (state) => ({
+        isOnboardingComplete: state.isOnboardingComplete,
+        data: state.data,
+      }),
+    }
+  )
+)
+
+// Selector hooks for better performance
+export const useOnboardingStep = () => useOnboarding((state) => state.currentStep)
+export const useIsOnboardingComplete = () =>
+  useOnboarding((state) => state.isOnboardingComplete)
+export const useOnboardingData = () => useOnboarding((state) => state.data)
--- a/src/features/onboarding/index.ts
+++ b/src/features/onboarding/index.ts
@@ -0,0 +1,26 @@
+// Types
+export * from './types'
+
+// Hooks
+export { useOnboarding, useOnboardingStep, useIsOnboardingComplete, useOnboardingData } from './hooks/useOnboarding'
+
+// Components
+export { OnboardingScreen } from './components/OnboardingScreen'
+export { PrimaryButton } from './components/PrimaryButton'
+export { ChoiceButton } from './components/ChoiceButton'
+export { PaywallCard } from './components/PaywallCard'
+export { MiniTimerDemo } from './components/MiniTimerDemo'
+export { ProgressBar } from './components/ProgressBar'
+
+// Screens
+export { Screen1Problem } from './screens/Screen1Problem'
+export { Screen2Empathy } from './screens/Screen2Empathy'
+export { Screen3Solution } from './screens/Screen3Solution'
+export { Screen4WowMoment } from './screens/Screen4WowMoment'
+export { Screen5Personalization } from './screens/Screen5Personalization'
+export { Screen6Paywall } from './screens/Screen6Paywall'
+
+// Data
+export { BARRIERS } from './data/barriers'
+export { LEVELS } from './data/levels'
+export { GOALS } from './data/goals'
--- a/src/features/onboarding/screens/Screen1Problem.tsx
+++ b/src/features/onboarding/screens/Screen1Problem.tsx
@@ -0,0 +1,165 @@
+import { useEffect, useRef } from 'react'
+import { StyleSheet, View, Text, Animated } from 'react-native'
+import { Ionicons } from '@expo/vector-icons'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { PrimaryButton } from '../components/PrimaryButton'
+import { BRAND, TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+interface Screen1ProblemProps {
+  onNext: () => void
+}
+
+export function Screen1Problem({ onNext }: Screen1ProblemProps) {
+  const clockScale = useRef(new Animated.Value(1)).current
+  const clockRotation = useRef(new Animated.Value(0)).current
+  const opacityAnim = useRef(new Animated.Value(0)).current
+  const translateYAnim = useRef(new Animated.Value(20)).current
+
+  useEffect(() => {
+    // Entrance animation
+    Animated.parallel([
+      Animated.timing(opacityAnim, {
+        toValue: 1,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+      Animated.timing(translateYAnim, {
+        toValue: 0,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+    ]).start()
+
+    // Clock pulse animation
+    const pulseAnimation = Animated.loop(
+      Animated.sequence([
+        Animated.timing(clockScale, {
+          toValue: 1.1,
+          duration: 800,
+          useNativeDriver: true,
+        }),
+        Animated.timing(clockScale, {
+          toValue: 1,
+          duration: 800,
+          useNativeDriver: true,
+        }),
+      ])
+    )
+
+    // Clock rotation animation
+    const rotationAnimation = Animated.loop(
+      Animated.timing(clockRotation, {
+        toValue: 1,
+        duration: 4000,
+        useNativeDriver: true,
+      })
+    )
+
+    pulseAnimation.start()
+    rotationAnimation.start()
+
+    return () => {
+      pulseAnimation.stop()
+      rotationAnimation.stop()
+    }
+  }, [clockScale, clockRotation, opacityAnim, translateYAnim])
+
+  const rotationInterpolate = clockRotation.interpolate({
+    inputRange: [0, 1],
+    outputRange: ['0deg', '360deg'],
+  })
+
+  return (
+    <OnboardingScreen currentStep={0}>
+      <Animated.View
+        style={[
+          styles.container,
+          {
+            opacity: opacityAnim,
+            transform: [{ translateY: translateYAnim }],
+          },
+        ]}
+      >
+        {/* Clock Icon Animation */}
+        <View style={styles.iconContainer}>
+          <Animated.View
+            style={[
+              styles.clockCircle,
+              { transform: [{ scale: clockScale }] },
+            ]}
+          >
+            <Animated.View style={{ transform: [{ rotate: rotationInterpolate }] }}>
+              <Ionicons name="time-outline" size={80} color={BRAND.PRIMARY} />
+            </Animated.View>
+          </Animated.View>
+          <View style={styles.crossMark}>
+            <Ionicons name="close" size={32} color={BRAND.DANGER} />
+          </View>
+        </View>
+
+        {/* Title and Subtitle */}
+        <View style={styles.textContainer}>
+          <Text style={styles.title}>Tu n'as pas 1 heure pour t'entrainer ?</Text>
+          <Text style={styles.subtitle}>Ni 30 minutes ? Ni meme 10 ?</Text>
+        </View>
+
+        {/* Spacer */}
+        <View style={styles.spacer} />
+
+        {/* Continue Button */}
+        <PrimaryButton title="Continuer" onPress={onNext} />
+      </Animated.View>
+    </OnboardingScreen>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+    paddingHorizontal: SPACING[4],
+  },
+  iconContainer: {
+    position: 'relative',
+    marginBottom: SPACING[10],
+  },
+  clockCircle: {
+    width: 140,
+    height: 140,
+    borderRadius: 70,
+    backgroundColor: 'rgba(249, 115, 22, 0.1)',
+    alignItems: 'center',
+    justifyContent: 'center',
+    borderWidth: 2,
+    borderColor: 'rgba(249, 115, 22, 0.3)',
+  },
+  crossMark: {
+    position: 'absolute',
+    bottom: -5,
+    right: -5,
+    backgroundColor: 'rgba(239, 68, 68, 0.2)',
+    borderRadius: 20,
+    padding: SPACING[1],
+  },
+  textContainer: {
+    alignItems: 'center',
+    marginBottom: SPACING[8],
+  },
+  title: {
+    ...TYPOGRAPHY.displayLarge,
+    color: TEXT.PRIMARY,
+    textAlign: 'center',
+    marginBottom: SPACING[4],
+  },
+  subtitle: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.MUTED,
+    textAlign: 'center',
+  },
+  spacer: {
+    flex: 1,
+  },
+})
--- a/src/features/onboarding/screens/Screen2Empathy.tsx
+++ b/src/features/onboarding/screens/Screen2Empathy.tsx
@@ -0,0 +1,104 @@
+import { useState, useEffect, useRef } from 'react'
+import { StyleSheet, View, Text, Animated } from 'react-native'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { ChoiceButton } from '../components/ChoiceButton'
+import { useOnboarding } from '../hooks/useOnboarding'
+import { BARRIERS } from '../data/barriers'
+import { TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+import type { Barrier } from '../types'
+
+interface Screen2EmpathyProps {
+  onNext: () => void
+}
+
+export function Screen2Empathy({ onNext }: Screen2EmpathyProps) {
+  const [selectedBarrier, setSelectedBarrier] = useState<Barrier | null>(null)
+  const { setBarrier } = useOnboarding()
+  const opacityAnim = useRef(new Animated.Value(0)).current
+  const translateYAnim = useRef(new Animated.Value(20)).current
+
+  useEffect(() => {
+    // Entrance animation
+    Animated.parallel([
+      Animated.timing(opacityAnim, {
+        toValue: 1,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+      Animated.timing(translateYAnim, {
+        toValue: 0,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+    ]).start()
+  }, [opacityAnim, translateYAnim])
+
+  const handleBarrierSelect = (barrier: Barrier) => {
+    setSelectedBarrier(barrier)
+    setBarrier(barrier)
+    // Auto-advance after selection
+    setTimeout(() => {
+      onNext()
+    }, 300)
+  }
+
+  return (
+    <OnboardingScreen currentStep={1}>
+      <Animated.View
+        style={[
+          styles.container,
+          {
+            opacity: opacityAnim,
+            transform: [{ translateY: translateYAnim }],
+          },
+        ]}
+      >
+        {/* Title */}
+        <View style={styles.titleContainer}>
+          <Text style={styles.title}>
+            Qu'est-ce qui t'empeche de t'entrainer ?
+          </Text>
+        </View>
+
+        {/* Choice Buttons */}
+        <View style={styles.choicesContainer}>
+          {BARRIERS.map((barrier, index) => (
+            <View key={barrier.id} style={styles.choiceWrapper}>
+              <ChoiceButton
+                label={barrier.label}
+                description={barrier.description}
+                icon={barrier.icon as never}
+                selected={selectedBarrier === barrier.id}
+                onPress={() => handleBarrierSelect(barrier.id)}
+              />
+            </View>
+          ))}
+        </View>
+      </Animated.View>
+    </OnboardingScreen>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    paddingTop: SPACING[8],
+  },
+  titleContainer: {
+    marginBottom: SPACING[8],
+    paddingHorizontal: SPACING[2],
+  },
+  title: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.PRIMARY,
+    textAlign: 'center',
+  },
+  choicesContainer: {
+    gap: SPACING[3],
+  },
+  choiceWrapper: {
+    width: '100%',
+  },
+})
--- a/src/features/onboarding/screens/Screen3Solution.tsx
+++ b/src/features/onboarding/screens/Screen3Solution.tsx
@@ -0,0 +1,251 @@
+import { useEffect, useRef } from 'react'
+import { StyleSheet, View, Text, Animated } from 'react-native'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { PrimaryButton } from '../components/PrimaryButton'
+import { BRAND, TEXT, SURFACE, PHASE_COLORS } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+
+interface Screen3SolutionProps {
+  onNext: () => void
+}
+
+const TABATA_ROUNDS = 8
+const WORK_DURATION = 20
+const REST_DURATION = 10
+
+export function Screen3Solution({ onNext }: Screen3SolutionProps) {
+  const opacityAnim = useRef(new Animated.Value(0)).current
+  const translateYAnim = useRef(new Animated.Value(20)).current
+  const activeRound = useRef(new Animated.Value(0)).current
+  const pulseAnim = useRef(new Animated.Value(1)).current
+
+  useEffect(() => {
+    // Entrance animation
+    Animated.parallel([
+      Animated.timing(opacityAnim, {
+        toValue: 1,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+      Animated.timing(translateYAnim, {
+        toValue: 0,
+        duration: 600,
+        useNativeDriver: true,
+      }),
+    ]).start()
+
+    // Round cycling animation
+    const roundAnimation = Animated.loop(
+      Animated.sequence([
+        ...Array.from({ length: TABATA_ROUNDS }, (_, i) =>
+          Animated.timing(activeRound, {
+            toValue: i + 1,
+            duration: 800,
+            useNativeDriver: false,
+          })
+        ),
+        Animated.timing(activeRound, {
+          toValue: 0,
+          duration: 500,
+          useNativeDriver: false,
+        }),
+      ])
+    )
+
+    // Pulse animation for the "4 minutes" text
+    const pulseAnimation = Animated.loop(
+      Animated.sequence([
+        Animated.timing(pulseAnim, {
+          toValue: 1.05,
+          duration: 600,
+          useNativeDriver: true,
+        }),
+        Animated.timing(pulseAnim, {
+          toValue: 1,
+          duration: 600,
+          useNativeDriver: true,
+        }),
+      ])
+    )
+
+    roundAnimation.start()
+    pulseAnimation.start()
+
+    return () => {
+      roundAnimation.stop()
+      pulseAnimation.stop()
+    }
+  }, [activeRound, opacityAnim, translateYAnim, pulseAnim])
+
+  const renderTabataTimeline = () => {
+    return (
+      <View style={styles.timelineContainer}>
+        {Array.from({ length: TABATA_ROUNDS }, (_, index) => {
+          const isWork = index % 2 === 0
+          const baseColor = isWork ? PHASE_COLORS.WORK : PHASE_COLORS.REST
+
+          return (
+            <Animated.View
+              key={index}
+              style={[
+                styles.timelineBlock,
+                {
+                  backgroundColor: activeRound.interpolate({
+                    inputRange: [index, index + 1, index + 1.01, TABATA_ROUNDS + 1],
+                    outputRange: [
+                      'rgba(255, 255, 255, 0.1)',
+                      baseColor,
+                      'rgba(255, 255, 255, 0.1)',
+                      'rgba(255, 255, 255, 0.1)',
+                    ],
+                    extrapolate: 'clamp',
+                  }),
+                },
+              ]}
+            >
+              <Text style={styles.timelineText}>
+                {isWork ? WORK_DURATION : REST_DURATION}s
+              </Text>
+            </Animated.View>
+          )
+        })}
+      </View>
+    )
+  }
+
+  return (
+    <OnboardingScreen currentStep={2}>
+      <Animated.View
+        style={[
+          styles.container,
+          {
+            opacity: opacityAnim,
+            transform: [{ translateY: translateYAnim }],
+          },
+        ]}
+      >
+        {/* Animated Title */}
+        <Animated.View style={[styles.titleContainer, { transform: [{ scale: pulseAnim }] }]}>
+          <Text style={styles.title}>4 minutes</Text>
+        </Animated.View>
+
+        {/* Subtitle */}
+        <Text style={styles.subtitle}>Vraiment transformatrices.</Text>
+
+        {/* Tabata Timeline Animation */}
+        <View style={styles.animationContainer}>
+          {renderTabataTimeline()}
+
+          {/* Legend */}
+          <View style={styles.legendContainer}>
+            <View style={styles.legendItem}>
+              <View style={[styles.legendDot, { backgroundColor: PHASE_COLORS.WORK }]} />
+              <Text style={styles.legendText}>20s travail</Text>
+            </View>
+            <View style={styles.legendItem}>
+              <View style={[styles.legendDot, { backgroundColor: PHASE_COLORS.REST }]} />
+              <Text style={styles.legendText}>10s repos</Text>
+            </View>
+            <Text style={styles.legendText}>x 8 rounds</Text>
+          </View>
+        </View>
+
+        {/* Scientific Explanation */}
+        <View style={styles.explanationContainer}>
+          <Text style={styles.explanationText}>
+            Protocole scientifique HIIT = resultats max en temps min
+          </Text>
+        </View>
+
+        {/* Spacer */}
+        <View style={styles.spacer} />
+
+        {/* Continue Button */}
+        <PrimaryButton title="Voir comment ca marche" onPress={onNext} />
+      </Animated.View>
+    </OnboardingScreen>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    paddingTop: SPACING[10],
+  },
+  titleContainer: {
+    marginBottom: SPACING[2],
+  },
+  title: {
+    ...TYPOGRAPHY.brandTitle,
+    color: BRAND.PRIMARY,
+    textAlign: 'center',
+  },
+  subtitle: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.SECONDARY,
+    textAlign: 'center',
+    marginBottom: SPACING[8],
+  },
+  animationContainer: {
+    width: '100%',
+    paddingVertical: SPACING[6],
+    paddingHorizontal: SPACING[4],
+  },
+  timelineContainer: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    justifyContent: 'center',
+    gap: SPACING[2],
+    marginBottom: SPACING[4],
+  },
+  timelineBlock: {
+    width: 40,
+    height: 40,
+    borderRadius: RADIUS.MD,
+    alignItems: 'center',
+    justifyContent: 'center',
+    backgroundColor: SURFACE.OVERLAY_LIGHT,
+  },
+  timelineText: {
+    ...TYPOGRAPHY.overline,
+    color: TEXT.PRIMARY,
+    fontWeight: '700',
+  },
+  legendContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: SPACING[4],
+    flexWrap: 'wrap',
+  },
+  legendItem: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: SPACING[1],
+  },
+  legendDot: {
+    width: 10,
+    height: 10,
+    borderRadius: 5,
+  },
+  legendText: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.MUTED,
+  },
+  explanationContainer: {
+    paddingHorizontal: SPACING[4],
+    marginTop: SPACING[4],
+  },
+  explanationText: {
+    ...TYPOGRAPHY.body,
+    color: TEXT.TERTIARY,
+    textAlign: 'center',
+    lineHeight: 26,
+  },
+  spacer: {
+    flex: 1,
+  },
+})
--- a/src/features/onboarding/screens/Screen4WowMoment.tsx
+++ b/src/features/onboarding/screens/Screen4WowMoment.tsx
@@ -0,0 +1,149 @@
+import { useState, useEffect, useCallback } from 'react'
+import { StyleSheet, View, Text, Animated } from 'react-native'
+import * as Haptics from 'expo-haptics'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { PrimaryButton } from '../components/PrimaryButton'
+import { MiniTimerDemo } from '../components/MiniTimerDemo'
+import { useOnboarding } from '../hooks/useOnboarding'
+import { TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+export function Screen4WowMoment() {
+  const nextStep = useOnboarding((state) => state.nextStep)
+  const [isComplete, setIsComplete] = useState(false)
+  const [currentPhase, setCurrentPhase] = useState<string>('IDLE')
+  const fadeAnim = useState(new Animated.Value(0))[0]
+
+  // Fade in animation for the button when complete
+  useEffect(() => {
+    if (isComplete) {
+      Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success)
+      Animated.timing(fadeAnim, {
+        toValue: 1,
+        duration: 400,
+        useNativeDriver: true,
+      }).start()
+    }
+  }, [isComplete, fadeAnim])
+
+  const getInstructionText = (): string => {
+    if (isComplete) {
+      return 'Bravo ! Tu viens de completer ton premier mini-Tabata.'
+    }
+    if (currentPhase === 'GET_READY') {
+      return 'Prepare-toi... Le timer va bientot commencer !'
+    }
+    if (currentPhase === 'WORK') {
+      return 'Donne tout ! 20 secondes, c est parti !'
+    }
+    return 'Un mini-Tabata de 20 secondes. Juste pour sentir.'
+  }
+
+  const handlePhaseChange = useCallback((phase: string) => {
+    setCurrentPhase(phase)
+    if (phase === 'WORK') {
+      Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Medium)
+    } else if (phase === 'GET_READY') {
+      Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+    }
+  }, [])
+
+  const handleCountdownTick = useCallback((seconds: number) => {
+    Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+  }, [])
+
+  const handleComplete = useCallback(() => {
+    setIsComplete(true)
+  }, [])
+
+  const handleContinue = () => {
+    nextStep()
+  }
+
+  return (
+    <OnboardingScreen currentStep={3}>
+      <View style={styles.container}>
+        {/* Title Section */}
+        <View style={styles.header}>
+          <Text style={styles.title}>Essaie maintenant</Text>
+          <Text style={styles.subtitle}>20 secondes. Juste pour sentir.</Text>
+        </View>
+
+        {/* Timer Demo - The "Wow" Moment */}
+        <View style={styles.timerContainer}>
+          <MiniTimerDemo
+            onComplete={handleComplete}
+            onPhaseChange={handlePhaseChange}
+            onCountdownTick={handleCountdownTick}
+          />
+        </View>
+
+        {/* Instruction Text */}
+        <View style={styles.instructionContainer}>
+          <Text style={styles.instructionText}>{getInstructionText()}</Text>
+        </View>
+
+        {/* Continue Button - Only visible after completion */}
+        <View style={styles.buttonContainer}>
+          {isComplete ? (
+            <Animated.View style={{ opacity: fadeAnim, width: '100%' }}>
+              <PrimaryButton title="C'etait facile !" onPress={handleContinue} />
+            </Animated.View>
+          ) : (
+            <View style={styles.placeholderButton} />
+          )}
+        </View>
+      </View>
+    </OnboardingScreen>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: 'space-between',
+    paddingTop: SPACING[10],
+  },
+  header: {
+    alignItems: 'center',
+    paddingHorizontal: SPACING[4],
+  },
+  title: {
+    ...TYPOGRAPHY.displayLarge,
+    color: TEXT.PRIMARY,
+    textAlign: 'center',
+    marginBottom: SPACING[3],
+  },
+  subtitle: {
+    ...TYPOGRAPHY.body,
+    color: TEXT.SECONDARY,
+    textAlign: 'center',
+  },
+  timerContainer: {
+    flex: 1,
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  instructionContainer: {
+    paddingHorizontal: SPACING[6],
+    paddingVertical: SPACING[4],
+    alignItems: 'center',
+  },
+  instructionText: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.TERTIARY,
+    textAlign: 'center',
+    lineHeight: 24,
+  },
+  buttonContainer: {
+    paddingHorizontal: SPACING[4],
+    paddingBottom: SPACING[4],
+    minHeight: 70,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  placeholderButton: {
+    height: 54,
+  },
+})
--- a/src/features/onboarding/screens/Screen5Personalization.tsx
+++ b/src/features/onboarding/screens/Screen5Personalization.tsx
@@ -0,0 +1,186 @@
+import { useState } from 'react'
+import { StyleSheet, View, Text, ScrollView } from 'react-native'
+import { Ionicons } from '@expo/vector-icons'
+import { useOnboarding } from '../hooks/useOnboarding'
+import { LEVELS } from '../data/levels'
+import { GOALS } from '../data/goals'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { ChoiceButton } from '../components/ChoiceButton'
+import { PrimaryButton } from '../components/PrimaryButton'
+import { BRAND, TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+import type { Level, Goal, Frequency } from '../types'
+
+interface Screen5PersonalizationProps {
+  onNext: () => void
+}
+
+interface FrequencyOption {
+  id: Frequency
+  label: string
+  description: string
+}
+
+const FREQUENCIES: FrequencyOption[] = [
+  { id: 2, label: '2x/semaine', description: 'Démarrage en douceur' },
+  { id: 3, label: '3x/semaine', description: 'Rythme equilibre' },
+  { id: 5, label: '5x/semaine', description: 'Entrainement intensif' },
+]
+
+export function Screen5Personalization({ onNext }: Screen5PersonalizationProps) {
+  const { data, setLevel, setGoal, setFrequency } = useOnboarding()
+
+  // Local state for selections
+  const [selectedLevel, setSelectedLevel] = useState<Level | null>(data.level)
+  const [selectedGoal, setSelectedGoal] = useState<Goal | null>(data.goal)
+  const [selectedFrequency, setSelectedFrequency] = useState<Frequency | null>(data.frequency)
+
+  const handleLevelSelect = (level: Level) => {
+    setSelectedLevel(level)
+    setLevel(level)
+  }
+
+  const handleGoalSelect = (goal: Goal) => {
+    setSelectedGoal(goal)
+    setGoal(goal)
+  }
+
+  const handleFrequencySelect = (frequency: Frequency) => {
+    setSelectedFrequency(frequency)
+    setFrequency(frequency)
+  }
+
+  const handleContinue = () => {
+    onNext()
+  }
+
+  const isFormComplete = selectedLevel && selectedGoal && selectedFrequency
+
+  return (
+    <OnboardingScreen currentStep={4}>
+      <ScrollView
+        style={styles.scrollView}
+        contentContainerStyle={styles.scrollContent}
+        showsVerticalScrollIndicator={false}
+      >
+        <View style={styles.header}>
+          <Text style={styles.title}>Personnalise ton experience</Text>
+          <Text style={styles.subtitle}>
+            Dis-nous en plus sur toi pour un programme sur mesure
+          </Text>
+        </View>
+
+        {/* Level Section */}
+        <View style={styles.section}>
+          <View style={styles.sectionHeader}>
+            <Ionicons name="fitness-outline" size={20} color={BRAND.PRIMARY} />
+            <Text style={styles.sectionTitle}>Niveau</Text>
+          </View>
+          <View style={styles.optionsContainer}>
+            {LEVELS.map((level) => (
+              <ChoiceButton
+                key={level.id}
+                label={level.label}
+                description={level.description}
+                icon={level.icon as keyof typeof Ionicons.glyphMap}
+                selected={selectedLevel === level.id}
+                onPress={() => handleLevelSelect(level.id)}
+              />
+            ))}
+          </View>
+        </View>
+
+        {/* Goal Section */}
+        <View style={styles.section}>
+          <View style={styles.sectionHeader}>
+            <Ionicons name="flag-outline" size={20} color={BRAND.PRIMARY} />
+            <Text style={styles.sectionTitle}>Objectif</Text>
+          </View>
+          <View style={styles.optionsContainer}>
+            {GOALS.map((goal) => (
+              <ChoiceButton
+                key={goal.id}
+                label={goal.label}
+                description={goal.description}
+                icon={goal.icon as keyof typeof Ionicons.glyphMap}
+                selected={selectedGoal === goal.id}
+                onPress={() => handleGoalSelect(goal.id)}
+              />
+            ))}
+          </View>
+        </View>
+
+        {/* Frequency Section */}
+        <View style={styles.section}>
+          <View style={styles.sectionHeader}>
+            <Ionicons name="calendar-outline" size={20} color={BRAND.PRIMARY} />
+            <Text style={styles.sectionTitle}>Frequence</Text>
+          </View>
+          <View style={styles.optionsContainer}>
+            {FREQUENCIES.map((freq) => (
+              <ChoiceButton
+                key={freq.id}
+                label={freq.label}
+                description={freq.description}
+                icon="time-outline"
+                selected={selectedFrequency === freq.id}
+                onPress={() => handleFrequencySelect(freq.id)}
+              />
+            ))}
+          </View>
+        </View>
+      </ScrollView>
+
+      <View style={styles.footer}>
+        <PrimaryButton
+          title="Continuer"
+          onPress={handleContinue}
+          disabled={!isFormComplete}
+        />
+      </View>
+    </OnboardingScreen>
+  )
+}
+
+const styles = StyleSheet.create({
+  scrollView: {
+    flex: 1,
+  },
+  scrollContent: {
+    paddingBottom: SPACING[6],
+  },
+  header: {
+    marginBottom: SPACING[6],
+  },
+  title: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.PRIMARY,
+    marginBottom: SPACING[2],
+  },
+  subtitle: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.MUTED,
+  },
+  section: {
+    marginBottom: SPACING[6],
+  },
+  sectionHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: SPACING[2],
+    marginBottom: SPACING[3],
+  },
+  sectionTitle: {
+    ...TYPOGRAPHY.label,
+    color: TEXT.SECONDARY,
+    textTransform: 'uppercase',
+    letterSpacing: 1,
+  },
+  optionsContainer: {
+    gap: SPACING[3],
+  },
+  footer: {
+    paddingTop: SPACING[4],
+  },
+})
--- a/src/features/onboarding/screens/Screen6Paywall.tsx
+++ b/src/features/onboarding/screens/Screen6Paywall.tsx
@@ -0,0 +1,234 @@
+import { useState } from 'react'
+import { StyleSheet, View, Text, ScrollView, Pressable } from 'react-native'
+import { useOnboarding } from '../hooks/useOnboarding'
+import { OnboardingScreen } from '../components/OnboardingScreen'
+import { PaywallCard } from '../components/PaywallCard'
+import { BRAND, TEXT } from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SPACING } from '@/src/shared/constants/spacing'
+
+interface Screen6PaywallProps {
+  onComplete: () => void
+}
+
+interface PlanOption {
+  id: 'trial' | 'monthly' | 'annual'
+  title: string
+  price: string
+  period: string
+  features: string[]
+  badge?: string
+}
+
+const PLANS: PlanOption[] = [
+  {
+    id: 'trial',
+    title: 'Essai gratuit',
+    price: '0',
+    period: '7 jours',
+    features: [
+      'Acces complet pendant 7 jours',
+      'Tous les programmes debloques',
+      'Annule a tout moment',
+    ],
+  },
+  {
+    id: 'monthly',
+    title: 'Mensuel',
+    price: '4.99',
+    period: 'mois',
+    features: [
+      'Acces illimite',
+      'Tous les programmes',
+      'Support prioritaire',
+      'Nouvelles fonctionnalites',
+    ],
+  },
+  {
+    id: 'annual',
+    title: 'Annuel',
+    price: '29.99',
+    period: 'an',
+    badge: 'Economise 50%',
+    features: [
+      'Acces illimite',
+      'Tous les programmes',
+      'Support prioritaire',
+      'Nouvelles fonctionnalites',
+      'Entrainements exclusifs',
+    ],
+  },
+]
+
+export function Screen6Paywall({ onComplete }: Screen6PaywallProps) {
+  const { completeOnboarding } = useOnboarding()
+  const [selectedPlan, setSelectedPlan] = useState<'trial' | 'monthly' | 'annual'>('annual')
+  const [isLoading, setIsLoading] = useState(false)
+
+  const handlePlanSelect = (planId: 'trial' | 'monthly' | 'annual') => {
+    setSelectedPlan(planId)
+  }
+
+  const handlePurchase = async () => {
+    setIsLoading(true)
+
+    try {
+      // Mock RevenueCat purchase in dev mode
+      // In production, this would call the actual RevenueCat SDK
+      await mockPurchase(selectedPlan)
+
+      // Complete onboarding and navigate to home
+      completeOnboarding()
+      onComplete()
+    } catch (error) {
+      console.error('Purchase failed:', error)
+      // In production, show error to user
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  const handleSkip = () => {
+    // Skip paywall and go to home
+    completeOnboarding()
+    onComplete()
+  }
+
+  return (
+    <OnboardingScreen currentStep={5}>
+      <ScrollView
+        style={styles.scrollView}
+        contentContainerStyle={styles.scrollContent}
+        showsVerticalScrollIndicator={false}
+      >
+        <View style={styles.header}>
+          <Text style={styles.title}>Debloque ton potentiel</Text>
+          <Text style={styles.subtitle}>
+            7 jours gratuits, annule quand tu veux
+          </Text>
+        </View>
+
+        <View style={styles.plansContainer}>
+          {PLANS.map((plan) => (
+            <PaywallCard
+              key={plan.id}
+              title={plan.title}
+              price={plan.price}
+              period={plan.period}
+              features={plan.features}
+              badge={plan.badge}
+              selected={selectedPlan === plan.id}
+              onPress={() => handlePlanSelect(plan.id)}
+            />
+          ))}
+        </View>
+
+        <View style={styles.guarantee}>
+          <Text style={styles.guaranteeText}>
+            Garantie satisfait ou rembourse sous 30 jours
+          </Text>
+        </View>
+      </ScrollView>
+
+      <View style={styles.footer}>
+        <Pressable
+          style={[styles.continueButton, isLoading && styles.buttonLoading]}
+          onPress={handlePurchase}
+          disabled={isLoading}
+        >
+          <Text style={styles.continueButtonText}>
+            {isLoading ? 'Traitement...' : selectedPlan === 'trial' ? 'Essayer gratuitement' : "S'abonner"}
+          </Text>
+        </Pressable>
+
+        <Pressable style={styles.skipButton} onPress={handleSkip}>
+          <Text style={styles.skipButtonText}>
+            Continuer sans abonnement
+          </Text>
+        </Pressable>
+      </View>
+    </OnboardingScreen>
+  )
+}
+
+// Mock RevenueCat purchase function for dev mode
+async function mockPurchase(planId: string): Promise<void> {
+  // Simulate network delay
+  await new Promise((resolve) => setTimeout(resolve, 1500))
+
+  // Simulate successful purchase
+  console.log(`[MOCK] Purchase successful for plan: ${planId}`)
+
+  // In production with RevenueCat:
+  // const { customerInfo } = await Purchases.purchasePackage(package)
+  // if (customerInfo.entitlements.active['pro']) { ... }
+}
+
+const styles = StyleSheet.create({
+  scrollView: {
+    flex: 1,
+  },
+  scrollContent: {
+    paddingBottom: SPACING[6],
+  },
+  header: {
+    marginBottom: SPACING[6],
+    alignItems: 'center',
+  },
+  title: {
+    ...TYPOGRAPHY.heading,
+    color: TEXT.PRIMARY,
+    marginBottom: SPACING[2],
+    textAlign: 'center',
+  },
+  subtitle: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.MUTED,
+    textAlign: 'center',
+  },
+  plansContainer: {
+    gap: SPACING[4],
+  },
+  guarantee: {
+    marginTop: SPACING[6],
+    alignItems: 'center',
+  },
+  guaranteeText: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.HINT,
+    textAlign: 'center',
+  },
+  footer: {
+    paddingTop: SPACING[4],
+  },
+  continueButton: {
+    backgroundColor: BRAND.PRIMARY,
+    borderRadius: 28,
+    paddingVertical: 18,
+    paddingHorizontal: 32,
+    alignItems: 'center',
+    justifyContent: 'center',
+    shadowColor: BRAND.PRIMARY,
+    shadowOffset: { width: 0, height: 4 },
+    shadowOpacity: 0.4,
+    shadowRadius: 12,
+    elevation: 8,
+  },
+  buttonLoading: {
+    opacity: 0.7,
+  },
+  continueButtonText: {
+    ...TYPOGRAPHY.buttonMedium,
+    color: TEXT.PRIMARY,
+  },
+  skipButton: {
+    marginTop: SPACING[4],
+    paddingVertical: SPACING[2],
+    alignItems: 'center',
+  },
+  skipButtonText: {
+    ...TYPOGRAPHY.caption,
+    color: TEXT.HINT,
+    textDecorationLine: 'underline',
+  },
+})
--- a/src/features/onboarding/screens/index.ts
+++ b/src/features/onboarding/screens/index.ts
@@ -0,0 +1,2 @@
+export { Screen5Personalization } from './Screen5Personalization'
+export { Screen6Paywall } from './Screen6Paywall'
--- a/src/features/onboarding/types.ts
+++ b/src/features/onboarding/types.ts
@@ -0,0 +1,20 @@
+export type Barrier = 'time' | 'motivation' | 'knowledge' | 'gym'
+
+export type Level = 'beginner' | 'intermediate' | 'advanced'
+
+export type Goal = 'weight_loss' | 'cardio' | 'strength' | 'wellness'
+
+export type Frequency = 2 | 3 | 5
+
+export interface OnboardingData {
+  barrier: Barrier | null
+  level: Level | null
+  goal: Goal | null
+  frequency: Frequency | null
+}
+
+export interface OnboardingState {
+  currentStep: number
+  isOnboardingComplete: boolean
+  data: OnboardingData
+}
--- a/src/features/timer/components/TimerControls.tsx
+++ b/src/features/timer/components/TimerControls.tsx
@@ -1,6 +1,10 @@
 import { Pressable, StyleSheet, View } from 'react-native'
 import Ionicons from '@expo/vector-icons/Ionicons'

+import { SURFACE, TEXT } from '@/src/shared/constants/colors'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+import { LAYOUT } from '@/src/shared/constants/spacing'
+
 interface TimerControlsProps {
  isRunning: boolean
  isPaused: boolean
@@ -24,7 +28,7 @@ export function TimerControls({
        style={({ pressed }) => [styles.button, pressed && styles.pressed]}
        onPress={onStop}
      >
-        <Ionicons name="stop" size={28} color="#FFFFFF" />
+        <Ionicons name="stop" size={28} color={TEXT.PRIMARY} />
      </Pressable>

      <Pressable
@@ -38,7 +42,7 @@ export function TimerControls({
        <Ionicons
          name={isPaused ? 'play' : 'pause'}
          size={36}
-          color="#FFFFFF"
+          color={TEXT.PRIMARY}
        />
      </Pressable>

@@ -46,7 +50,7 @@ export function TimerControls({
        style={({ pressed }) => [styles.button, pressed && styles.pressed]}
        onPress={onSkip}
      >
-        <Ionicons name="play-skip-forward" size={28} color="#FFFFFF" />
+        <Ionicons name="play-skip-forward" size={28} color={TEXT.PRIMARY} />
      </Pressable>
    </View>
  )
@@ -57,23 +61,23 @@ const styles = StyleSheet.create({
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
-    gap: 32,
+    gap: LAYOUT.CONTROLS_GAP,
  },
  button: {
    width: 56,
    height: 56,
-    borderRadius: 28,
-    backgroundColor: 'rgba(255, 255, 255, 0.15)',
+    borderRadius: RADIUS['2XL'],
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
    alignItems: 'center',
    justifyContent: 'center',
  },
  mainButton: {
    width: 72,
    height: 72,
-    borderRadius: 36,
-    backgroundColor: 'rgba(255, 255, 255, 0.25)',
+    borderRadius: RADIUS['4XL'],
+    backgroundColor: SURFACE.OVERLAY_STRONG,
  },
  pressed: {
-    opacity: 0.6,
+    transform: [{ scale: 0.92 }],
  },
 })
--- a/src/features/timer/components/TimerDisplay.tsx
+++ b/src/features/timer/components/TimerDisplay.tsx
@@ -1,22 +1,38 @@
 import { useEffect, useRef, useState } from 'react'
 import {
  Animated,
-  Easing,
  Pressable,
  StyleSheet,
  Text,
  View,
 } from 'react-native'
+import { LinearGradient } from 'expo-linear-gradient'
+import { BlurView } from 'expo-blur'
 import { StatusBar } from 'expo-status-bar'
 import { useSafeAreaInsets } from 'react-native-safe-area-context'
-import { PHASE_COLORS } from '@/src/shared/constants/colors'
+import {
+  PHASE_GRADIENTS,
+  ACCENT,
+  BRAND,
+  SURFACE,
+  TEXT,
+  BORDER,
+  APP_GRADIENTS,
+  GLASS,
+} from '@/src/shared/constants/colors'
+import { TYPOGRAPHY } from '@/src/shared/constants/typography'
+import { SHADOW, TEXT_SHADOW } from '@/src/shared/constants/shadows'
+import { RADIUS } from '@/src/shared/constants/borderRadius'
+import { LAYOUT, SPACING } from '@/src/shared/constants/spacing'
+import { SPRING, ANIMATION } from '@/src/shared/constants/animations'
 import { formatTime } from '@/src/shared/utils/formatTime'
-import type { TimerConfig, TimerState } from '../types'
+import type { TimerConfig, TimerPhase, TimerState } from '../types'
 import { TimerControls } from './TimerControls'

-const PHASE_LABELS: Record<string, string> = {
+const PHASE_LABELS: Record<TimerPhase, string> = {
+  IDLE: '',
  GET_READY: 'PRÉPARE-TOI',
-  WORK: 'TRAVAIL',
+  WORK: 'GO !',
  REST: 'REPOS',
  COMPLETE: 'TERMINÉ !',
 }
@@ -45,16 +61,11 @@ export function TimerDisplay({
  onSkip,
 }: TimerDisplayProps) {
  const insets = useSafeAreaInsets()
+  const top = insets.top || 20
+  const bottom = insets.bottom || 20

  if (state.phase === 'IDLE') {
-    return (
-      <IdleView
-        config={config}
-        onStart={onStart}
-        topInset={insets.top}
-        bottomInset={insets.bottom}
-      />
-    )
+    return <IdleView config={config} onStart={onStart} top={top} bottom={bottom} />
  }

  if (state.phase === 'COMPLETE') {
@@ -63,8 +74,8 @@ export function TimerDisplay({
        totalElapsedSeconds={state.totalElapsedSeconds}
        totalRounds={state.totalRounds}
        onStop={onStop}
-        topInset={insets.top}
-        bottomInset={insets.bottom}
+        top={top}
+        bottom={bottom}
      />
    )
  }
@@ -78,85 +89,151 @@ export function TimerDisplay({
      onResume={onResume}
      onStop={onStop}
      onSkip={onSkip}
-      topInset={insets.top}
-      bottomInset={insets.bottom}
+      top={top}
+      bottom={bottom}
    />
  )
 }

-// --- IDLE view ---
+// ──────────────────────────────────────────────────────
+// IDLE — Start screen
+// ──────────────────────────────────────────────────────

 function IdleView({
  config,
  onStart,
-  topInset,
-  bottomInset,
+  top,
+  bottom,
 }: {
  config: TimerConfig
  onStart: () => void
-  topInset: number
-  bottomInset: number
+  top: number
+  bottom: number
 }) {
+  const glowAnim = useRef(new Animated.Value(0)).current
+
+  useEffect(() => {
+    Animated.loop(
+      Animated.sequence([
+        Animated.timing(glowAnim, {
+          toValue: 1,
+          ...ANIMATION.BREATH_HALF,
+        }),
+        Animated.timing(glowAnim, {
+          toValue: 0,
+          ...ANIMATION.BREATH_HALF,
+        }),
+      ])
+    ).start()
+  }, [])
+
+  const glowOpacity = glowAnim.interpolate({
+    inputRange: [0, 1],
+    outputRange: [0.15, 0.4],
+  })
+
+  const glowScale = glowAnim.interpolate({
+    inputRange: [0, 1],
+    outputRange: [1, 1.12],
+  })
+
  return (
-    <View
-      style={[
-        styles.screen,
-        { backgroundColor: PHASE_COLORS.IDLE, paddingTop: topInset, paddingBottom: bottomInset },
-      ]}
+    <LinearGradient
+      colors={APP_GRADIENTS.HOME}
+      style={[styles.screen, { paddingTop: top, paddingBottom: bottom }]}
+      start={{ x: 0, y: 0 }}
+      end={{ x: 1, y: 1 }}
    >
      <StatusBar style="light" />

      <View style={styles.idleContent}>
-        <Text style={styles.idleTitle}>TABATAGO</Text>
+        <Text style={styles.idleTitle}>TABATA</Text>
+        <Text style={styles.idleSubtitle}>GO</Text>

        <View style={styles.configSummary}>
-          <Text style={styles.configLine}>
-            {config.workDuration}s travail / {config.restDuration}s repos
-          </Text>
-          <Text style={styles.configLine}>
-            {config.rounds} rounds
-          </Text>
+          <View style={styles.configRow}>
+            <ConfigBadge label={`${config.workDuration}s`} sub="travail" />
+            <ConfigBadge label={`${config.restDuration}s`} sub="repos" />
+            <ConfigBadge label={`${config.rounds}`} sub="rounds" />
+          </View>
        </View>

-        <Pressable
-          style={({ pressed }) => [
-            styles.startButton,
-            pressed && styles.startButtonPressed,
-          ]}
-          onPress={onStart}
-        >
-          <Text style={styles.startButtonText}>START</Text>
-        </Pressable>
+        <View style={styles.startButtonContainer}>
+          <Animated.View
+            style={[
+              styles.startButtonGlow,
+              { opacity: glowOpacity, transform: [{ scale: glowScale }] },
+            ]}
+          />
+          <Pressable
+            style={({ pressed }) => [
+              styles.startButton,
+              pressed && styles.buttonPressed,
+            ]}
+            onPress={onStart}
+          >
+            <Text style={styles.startButtonText}>START</Text>
+          </Pressable>
+        </View>
      </View>
+    </LinearGradient>
+  )
+}
+
+function ConfigBadge({ label, sub }: { label: string; sub: string }) {
+  return (
+    <View style={styles.configBadge}>
+      <Text style={styles.configBadgeLabel}>{label}</Text>
+      <Text style={styles.configBadgeSub}>{sub}</Text>
    </View>
  )
 }

-// --- COMPLETE view ---
+// ──────────────────────────────────────────────────────
+// COMPLETE — Victory screen
+// ──────────────────────────────────────────────────────

 function CompleteView({
  totalElapsedSeconds,
  totalRounds,
  onStop,
-  topInset,
-  bottomInset,
+  top,
+  bottom,
 }: {
  totalElapsedSeconds: number
  totalRounds: number
  onStop: () => void
-  topInset: number
-  bottomInset: number
+  top: number
+  bottom: number
 }) {
+  const scaleAnim = useRef(new Animated.Value(0.5)).current
+  const opacityAnim = useRef(new Animated.Value(0)).current
+
+  useEffect(() => {
+    Animated.parallel([
+      Animated.spring(scaleAnim, {
+        toValue: 1,
+        ...SPRING.BOUNCY,
+        useNativeDriver: true,
+      }),
+      Animated.timing(opacityAnim, ANIMATION.FADE_IN),
+    ]).start()
+  }, [])
+
  return (
-    <View
-      style={[
-        styles.screen,
-        { backgroundColor: PHASE_COLORS.COMPLETE, paddingTop: topInset, paddingBottom: bottomInset },
-      ]}
+    <LinearGradient
+      colors={PHASE_GRADIENTS.COMPLETE}
+      style={[styles.screen, { paddingTop: top, paddingBottom: bottom }]}
    >
      <StatusBar style="light" />

-      <View style={styles.idleContent}>
+      <Animated.View
+        style={[
+          styles.completeContent,
+          { opacity: opacityAnim, transform: [{ scale: scaleAnim }] },
+        ]}
+      >
+        <Text style={styles.completeEmoji}>&#x1F525;</Text>
        <Text style={styles.completeTitle}>TERMINÉ !</Text>
        <Text style={styles.completeTime}>{formatTime(totalElapsedSeconds)}</Text>
        <Text style={styles.completeRounds}>
@@ -166,18 +243,20 @@ function CompleteView({
        <Pressable
          style={({ pressed }) => [
            styles.doneButton,
-            pressed && styles.startButtonPressed,
+            pressed && styles.buttonPressed,
          ]}
          onPress={onStop}
        >
          <Text style={styles.doneButtonText}>Terminer</Text>
        </Pressable>
-      </View>
-    </View>
+      </Animated.View>
+    </LinearGradient>
  )
 }

-// --- ACTIVE view (GET_READY, WORK, REST) ---
+// ──────────────────────────────────────────────────────
+// ACTIVE — Countdown with native blur toolbar
+// ──────────────────────────────────────────────────────

 function ActiveView({
  state,
@@ -187,8 +266,8 @@ function ActiveView({
  onResume,
  onStop,
  onSkip,
-  topInset,
-  bottomInset,
+  top,
+  bottom,
 }: {
  state: TimerState
  exerciseName: string
@@ -197,59 +276,36 @@ function ActiveView({
  onResume: () => void
  onStop: () => void
  onSkip: () => void
-  topInset: number
-  bottomInset: number
+  top: number
+  bottom: number
 }) {
-  // --- Background color transition ---
-  const [prevColor, setPrevColor] = useState<string>(PHASE_COLORS.IDLE)
+  const gradient = PHASE_GRADIENTS[state.phase] ?? PHASE_GRADIENTS.IDLE
+
+  // --- Gradient crossfade ---
+  const [prevGradient, setPrevGradient] = useState<readonly string[]>(PHASE_GRADIENTS.IDLE)
  const fadeAnim = useRef(new Animated.Value(1)).current

  useEffect(() => {
-    const targetColor = PHASE_COLORS[state.phase]
    fadeAnim.setValue(0)
-    Animated.timing(fadeAnim, {
-      toValue: 1,
-      duration: 600,
-      easing: Easing.inOut(Easing.ease),
-      useNativeDriver: false,
-    }).start(() => {
-      setPrevColor(targetColor)
+    Animated.timing(fadeAnim, ANIMATION.GRADIENT_CROSSFADE).start(() => {
+      setPrevGradient(gradient)
    })
  }, [state.phase])

-  const backgroundColor = fadeAnim.interpolate({
-    inputRange: [0, 1],
-    outputRange: [prevColor, PHASE_COLORS[state.phase]],
-  })
-
  // --- Countdown pulse ---
  const pulseAnim = useRef(new Animated.Value(1)).current

  useEffect(() => {
    if (state.isRunning) {
      Animated.sequence([
-        Animated.timing(pulseAnim, {
-          toValue: 1.05,
-          duration: 80,
-          useNativeDriver: true,
-        }),
-        Animated.timing(pulseAnim, {
-          toValue: 1,
-          duration: 80,
-          useNativeDriver: true,
-        }),
+        Animated.timing(pulseAnim, ANIMATION.PULSE_UP),
+        Animated.timing(pulseAnim, ANIMATION.PULSE_DOWN),
      ]).start()
    }
  }, [state.secondsLeft])

-  // --- Progress ---
-  const totalPhaseDuration =
-    state.phase === 'GET_READY'
-      ? 0
-      : (state.currentRound - 1) / state.totalRounds
  const isLastSeconds = state.secondsLeft <= 3 && state.secondsLeft > 0

-  // Top info line
  const topLabel =
    state.phase === 'GET_READY'
      ? exerciseName
@@ -258,86 +314,99 @@ function ActiveView({
        : exerciseName

  return (
-    <Animated.View
-      style={[
-        styles.screen,
-        { backgroundColor, paddingTop: topInset, paddingBottom: bottomInset },
-      ]}
-    >
+    <View style={styles.screen}>
      <StatusBar hidden />

-      {/* Zone haute — exercice + round */}
-      <View style={styles.topZone}>
-        <Text style={styles.exerciseName} numberOfLines={1}>
-          {topLabel}
-        </Text>
-        {state.currentRound > 0 && (
-          <Text style={styles.roundIndicator}>
-            Round {state.currentRound}/{state.totalRounds}
-          </Text>
-        )}
-      </View>
-
-      {/* Zone centrale — countdown */}
-      <View style={styles.centerZone}>
-        <Text style={styles.phaseLabel}>
-          {PHASE_LABELS[state.phase] ?? ''}
-        </Text>
-        <Animated.Text
-          style={[
-            styles.countdown,
-            { transform: [{ scale: pulseAnim }] },
-            isLastSeconds && styles.countdownFlash,
-          ]}
-        >
-          {state.secondsLeft}
-        </Animated.Text>
-        {state.isPaused && (
-          <Text style={styles.pausedLabel}>EN PAUSE</Text>
-        )}
-      </View>
-
-      {/* Zone basse haute — progress bar */}
-      <View style={styles.progressZone}>
-        <View style={styles.progressTrack}>
-          <View
-            style={[
-              styles.progressFill,
-              { width: `${totalPhaseDuration * 100}%` },
-            ]}
-          />
-        </View>
-        <View style={styles.roundDots}>
-          {Array.from({ length: state.totalRounds }, (_, i) => (
-            <View
-              key={i}
-              style={[
-                styles.dot,
-                i < state.currentRound && styles.dotFilled,
-                i === state.currentRound - 1 &&
-                  state.phase === 'WORK' &&
-                  styles.dotActive,
-              ]}
-            />
-          ))}
-        </View>
-      </View>
-
-      {/* Zone basse — controls */}
-      <View style={styles.controlsZone}>
-        <TimerControls
-          isRunning={state.isRunning}
-          isPaused={state.isPaused}
-          onPause={onPause}
-          onResume={onResume}
-          onStop={onStop}
-          onSkip={onSkip}
+      {/* Gradient layers */}
+      <LinearGradient
+        colors={prevGradient as [string, string, ...string[]]}
+        style={StyleSheet.absoluteFill}
+      />
+      <Animated.View style={[StyleSheet.absoluteFill, { opacity: fadeAnim }]}>
+        <LinearGradient
+          colors={gradient as unknown as [string, string, ...string[]]}
+          style={StyleSheet.absoluteFill}
        />
+      </Animated.View>
+
+      {/* Content */}
+      <View style={[styles.activeContent, { paddingTop: top }]}>
+        {/* Top bar */}
+        <View style={styles.topZone}>
+          <Text style={styles.exerciseName} numberOfLines={1}>
+            {topLabel}
+          </Text>
+          {state.currentRound > 0 && (
+            <View style={styles.roundBadge}>
+              <Text style={styles.roundBadgeText}>
+                {state.currentRound}/{state.totalRounds}
+              </Text>
+            </View>
+          )}
+        </View>
+
+        {/* Center — countdown */}
+        <View style={styles.centerZone}>
+          <Text style={styles.phaseLabel}>
+            {PHASE_LABELS[state.phase]}
+          </Text>
+
+          <Animated.Text
+            style={[
+              styles.countdown,
+              { transform: [{ scale: pulseAnim }] },
+              isLastSeconds && styles.countdownFlash,
+            ]}
+          >
+            {state.secondsLeft}
+          </Animated.Text>
+
+          {state.isPaused && (
+            <View style={styles.pausedContainer}>
+              <Text style={styles.pausedLabel}>EN PAUSE</Text>
+            </View>
+          )}
+        </View>
+
+        {/* Bottom toolbar — native blur like iOS UIToolbar */}
+        <BlurView
+          intensity={GLASS.BLUR_HEAVY}
+          tint="dark"
+          style={[styles.bottomBar, { paddingBottom: bottom + 8 }]}
+        >
+          <View style={styles.roundDots}>
+            {Array.from({ length: state.totalRounds }, (_, i) => (
+              <View
+                key={i}
+                style={[
+                  styles.dot,
+                  i < state.currentRound && styles.dotFilled,
+                  i === state.currentRound - 1 &&
+                    state.phase === 'WORK' &&
+                    styles.dotActive,
+                ]}
+              />
+            ))}
+          </View>
+
+          <TimerControls
+            isRunning={state.isRunning}
+            isPaused={state.isPaused}
+            onPause={onPause}
+            onResume={onResume}
+            onStop={onStop}
+            onSkip={onSkip}
+          />
+        </BlurView>
      </View>
-    </Animated.View>
+    </View>
  )
 }

+// ──────────────────────────────────────────────────────
+// Styles
+// ──────────────────────────────────────────────────────
+
 const styles = StyleSheet.create({
  screen: {
    flex: 1,
@@ -348,94 +417,137 @@ const styles = StyleSheet.create({
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
-    gap: 24,
  },
  idleTitle: {
-    fontSize: 40,
-    fontWeight: '900',
-    color: '#FFFFFF',
-    letterSpacing: 6,
+    ...TYPOGRAPHY.brandTitle,
+    color: ACCENT.ORANGE,
+    ...TEXT_SHADOW.BRAND,
+  },
+  idleSubtitle: {
+    ...TYPOGRAPHY.displaySmall,
+    color: ACCENT.WHITE,
+    marginTop: -6,
  },
  configSummary: {
+    marginTop: SPACING[10],
+  },
+  configRow: {
+    flexDirection: 'row',
+    gap: SPACING[3],
+  },
+  configBadge: {
+    backgroundColor: SURFACE.OVERLAY_LIGHT,
+    borderRadius: RADIUS.LG,
+    paddingVertical: SPACING[3],
+    paddingHorizontal: SPACING[5],
    alignItems: 'center',
-    gap: 4,
-    marginTop: 16,
+    borderWidth: 1,
+    borderColor: BORDER.LIGHT,
  },
-  configLine: {
-    fontSize: 18,
-    color: 'rgba(255, 255, 255, 0.7)',
-    fontWeight: '500',
+  configBadgeLabel: {
+    ...TYPOGRAPHY.heading,
+    color: ACCENT.WHITE,
  },
-  startButton: {
-    width: 140,
-    height: 140,
-    borderRadius: 70,
-    backgroundColor: '#F97316',
+  configBadgeSub: {
+    ...TYPOGRAPHY.overline,
+    color: TEXT.MUTED,
+    marginTop: 2,
+  },
+  startButtonContainer: {
+    marginTop: SPACING[14],
    alignItems: 'center',
    justifyContent: 'center',
-    marginTop: 40,
  },
-  startButtonPressed: {
-    opacity: 0.7,
+  startButtonGlow: {
+    position: 'absolute',
+    width: 172,
+    height: 172,
+    borderRadius: 86,
+    backgroundColor: ACCENT.ORANGE,
+  },
+  startButton: {
+    width: 150,
+    height: 150,
+    borderRadius: 75,
+    backgroundColor: ACCENT.ORANGE,
+    alignItems: 'center',
+    justifyContent: 'center',
+    ...SHADOW.BRAND_GLOW,
+  },
+  buttonPressed: {
+    transform: [{ scale: 0.95 }],
  },
  startButtonText: {
-    fontSize: 28,
-    fontWeight: '900',
-    color: '#FFFFFF',
-    letterSpacing: 3,
+    ...TYPOGRAPHY.buttonHero,
+    color: ACCENT.WHITE,
  },

  // --- COMPLETE ---
+  completeContent: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: SPACING[2],
+  },
+  completeEmoji: {
+    fontSize: 72,
+    marginBottom: SPACING[2],
+  },
  completeTitle: {
-    fontSize: 40,
-    fontWeight: '900',
-    color: '#FFFFFF',
+    ...TYPOGRAPHY.displayLarge,
+    color: ACCENT.WHITE,
  },
  completeTime: {
-    fontSize: 64,
-    fontWeight: '900',
-    color: '#FFFFFF',
-    fontVariant: ['tabular-nums'],
-    marginTop: 8,
+    ...TYPOGRAPHY.timeDisplay,
+    color: ACCENT.WHITE,
+    ...TEXT_SHADOW.WHITE_MEDIUM,
  },
  completeRounds: {
-    fontSize: 18,
-    color: 'rgba(255, 255, 255, 0.8)',
-    fontWeight: '500',
+    ...TYPOGRAPHY.body,
+    color: TEXT.TERTIARY,
+    fontWeight: '600',
  },
  doneButton: {
-    paddingHorizontal: 48,
-    paddingVertical: 16,
-    borderRadius: 32,
-    backgroundColor: 'rgba(255, 255, 255, 0.25)',
-    marginTop: 40,
+    marginTop: SPACING[10],
+    paddingHorizontal: SPACING[12],
+    paddingVertical: SPACING[4],
+    borderRadius: RADIUS['3XL'],
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
+    borderWidth: 1,
+    borderColor: BORDER.STRONG,
  },
  doneButtonText: {
-    fontSize: 20,
-    fontWeight: '700',
-    color: '#FFFFFF',
+    ...TYPOGRAPHY.buttonMedium,
+    color: ACCENT.WHITE,
  },

  // --- ACTIVE ---
+  activeContent: {
+    flex: 1,
+  },
  topZone: {
-    paddingHorizontal: 24,
-    paddingTop: 16,
-    paddingBottom: 12,
+    paddingHorizontal: LAYOUT.PAGE_HORIZONTAL,
+    paddingTop: SPACING[3],
+    paddingBottom: SPACING[2],
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  exerciseName: {
-    fontSize: 18,
-    fontWeight: '600',
-    color: 'rgba(255, 255, 255, 0.9)',
+    ...TYPOGRAPHY.body,
+    color: TEXT.SECONDARY,
    flex: 1,
  },
-  roundIndicator: {
-    fontSize: 16,
-    fontWeight: '700',
-    color: 'rgba(255, 255, 255, 0.8)',
-    marginLeft: 12,
+  roundBadge: {
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
+    borderRadius: RADIUS.MD,
+    paddingVertical: SPACING[1.5],
+    paddingHorizontal: SPACING[3.5],
+    marginLeft: SPACING[3],
+  },
+  roundBadgeText: {
+    ...TYPOGRAPHY.label,
+    color: ACCENT.WHITE,
  },

  centerZone: {
@@ -444,68 +556,60 @@ const styles = StyleSheet.create({
    justifyContent: 'center',
  },
  phaseLabel: {
-    fontSize: 22,
-    fontWeight: '700',
-    color: 'rgba(255, 255, 255, 0.8)',
-    letterSpacing: 3,
-    marginBottom: 8,
+    ...TYPOGRAPHY.heading,
+    color: TEXT.TERTIARY,
+    letterSpacing: 6,
+    marginBottom: SPACING[1],
  },
  countdown: {
-    fontSize: 120,
-    fontWeight: '900',
-    color: '#FFFFFF',
-    fontVariant: ['tabular-nums'],
+    ...TYPOGRAPHY.countdown,
+    color: ACCENT.WHITE,
+    ...TEXT_SHADOW.WHITE_SOFT,
  },
  countdownFlash: {
-    color: '#EF4444',
+    color: ACCENT.RED_HOT,
+    ...TEXT_SHADOW.DANGER,
+  },
+  pausedContainer: {
+    marginTop: SPACING[4],
+    paddingVertical: SPACING[2],
+    paddingHorizontal: SPACING[6],
+    borderRadius: RADIUS.XL,
+    backgroundColor: SURFACE.SCRIM,
  },
  pausedLabel: {
-    fontSize: 18,
-    fontWeight: '700',
-    color: 'rgba(255, 255, 255, 0.6)',
-    letterSpacing: 4,
-    marginTop: 12,
+    ...TYPOGRAPHY.caption,
+    fontWeight: '800',
+    color: TEXT.MUTED,
+    letterSpacing: 6,
  },

-  progressZone: {
-    paddingHorizontal: 24,
-    gap: 12,
-    marginBottom: 8,
-  },
-  progressTrack: {
-    height: 4,
-    backgroundColor: 'rgba(255, 255, 255, 0.2)',
-    borderRadius: 2,
-    overflow: 'hidden',
-  },
-  progressFill: {
-    height: '100%',
-    backgroundColor: 'rgba(255, 255, 255, 0.8)',
-    borderRadius: 2,
+  // --- Bottom toolbar (native blur) ---
+  bottomBar: {
+    borderTopWidth: StyleSheet.hairlineWidth,
+    borderTopColor: BORDER.MEDIUM,
+    paddingTop: SPACING[4],
+    gap: SPACING[5],
  },
  roundDots: {
    flexDirection: 'row',
    justifyContent: 'center',
-    gap: 8,
+    gap: SPACING[2.5],
  },
  dot: {
    width: 8,
    height: 8,
-    borderRadius: 4,
-    backgroundColor: 'rgba(255, 255, 255, 0.25)',
+    borderRadius: RADIUS.XS,
+    backgroundColor: SURFACE.OVERLAY_MEDIUM,
  },
  dotFilled: {
-    backgroundColor: 'rgba(255, 255, 255, 0.9)',
+    backgroundColor: TEXT.SECONDARY,
  },
  dotActive: {
-    backgroundColor: '#FFFFFF',
-    width: 10,
-    height: 10,
-    borderRadius: 5,
-  },
-
-  controlsZone: {
-    paddingBottom: 24,
-    paddingTop: 16,
+    backgroundColor: ACCENT.WHITE,
+    width: 12,
+    height: 12,
+    borderRadius: SPACING[1.5],
+    ...SHADOW.WHITE_GLOW,
  },
 })
--- a/src/features/timer/hooks/useTimerEngine.ts
+++ b/src/features/timer/hooks/useTimerEngine.ts
@@ -117,6 +117,9 @@ export function useTimerEngine(): TimerEngine {
    const duration = getDurationForPhase(nextPhase, configRef.current)
    if (duration > 0) {
      startCountdown(duration)
+    } else {
+      // Phase with 0 duration - immediately advance to next phase
+      advancePhase()
    }
  }

--- a/src/shared/components/GlassView.tsx
+++ b/src/shared/components/GlassView.tsx
@@ -0,0 +1,32 @@
+import { StyleSheet, View, type ViewProps } from 'react-native'
+import { BlurView } from 'expo-blur'
+import { GLASS } from '../constants/colors'
+
+interface GlassViewProps extends ViewProps {
+  intensity?: number
+  children: React.ReactNode
+}
+
+export function GlassView({
+  intensity = GLASS.BLUR_MEDIUM,
+  style,
+  children,
+  ...rest
+}: GlassViewProps) {
+  return (
+    <View style={[styles.container, style]} {...rest}>
+      <BlurView intensity={intensity} tint="dark" style={StyleSheet.absoluteFill} />
+      {children}
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    overflow: 'hidden',
+    backgroundColor: GLASS.FILL,
+    borderWidth: 0.5,
+    borderColor: GLASS.BORDER,
+    borderTopColor: GLASS.BORDER_TOP,
+  },
+})
--- a/src/shared/components/Typography.tsx
+++ b/src/shared/components/Typography.tsx
@@ -0,0 +1,25 @@
+import { Text, type TextProps } from 'react-native'
+import { TYPOGRAPHY } from '../constants/typography'
+import { TEXT } from '../constants/colors'
+
+type TypographyVariant = keyof typeof TYPOGRAPHY
+
+interface TypographyProps extends TextProps {
+  variant: TypographyVariant
+  color?: string
+  children: React.ReactNode
+}
+
+export function Typography({
+  variant,
+  color = TEXT.PRIMARY,
+  style,
+  children,
+  ...rest
+}: TypographyProps) {
+  return (
+    <Text style={[TYPOGRAPHY[variant], { color }, style]} {...rest}>
+      {children}
+    </Text>
+  )
+}
--- a/src/shared/constants/animations.ts
+++ b/src/shared/constants/animations.ts
@@ -0,0 +1,51 @@
+import { Easing } from 'react-native'
+
+export const DURATION = {
+  SNAP: 60,
+  QUICK: 120,
+  FAST: 300,
+  NORMAL: 400,
+  SLOW: 600,
+  XSLOW: 1000,
+  BREATH: 1800,
+} as const
+
+export const EASING = {
+  STANDARD: Easing.inOut(Easing.ease),
+  DECELERATE: Easing.out(Easing.ease),
+  LINEAR: Easing.linear,
+} as const
+
+export const SPRING = {
+  BOUNCY: { tension: 50, friction: 7 },
+} as const
+
+export const ANIMATION = {
+  PULSE_UP: {
+    toValue: 1.08,
+    duration: DURATION.SNAP,
+    useNativeDriver: true,
+  },
+  PULSE_DOWN: {
+    toValue: 1,
+    duration: DURATION.QUICK,
+    easing: EASING.DECELERATE,
+    useNativeDriver: true,
+  },
+  GRADIENT_CROSSFADE: {
+    toValue: 1,
+    duration: DURATION.SLOW,
+    easing: EASING.STANDARD,
+    useNativeDriver: true,
+  },
+  FADE_IN: {
+    toValue: 1,
+    duration: DURATION.NORMAL,
+    useNativeDriver: true,
+  },
+  BREATH_HALF: {
+    duration: DURATION.BREATH,
+    easing: EASING.STANDARD,
+    useNativeDriver: false,
+  },
+} as const
--- a/src/shared/constants/borderRadius.ts
+++ b/src/shared/constants/borderRadius.ts
@@ -0,0 +1,11 @@
+export const RADIUS = {
+  XS: 4,
+  SM: 6,
+  MD: 12,
+  LG: 16,
+  XL: 20,
+  '2XL': 28,
+  '3XL': 32,
+  '4XL': 36,
+  FULL: 9999,
+} as const
--- a/src/shared/constants/colors.ts
+++ b/src/shared/constants/colors.ts
@@ -5,3 +5,72 @@ export const PHASE_COLORS = {
  REST: '#3B82F6',
  COMPLETE: '#22C55E',
 } as const
+
+export const PHASE_GRADIENTS = {
+  IDLE: ['#0A0A14', '#12101F', '#1E1E2E'] as const,
+  GET_READY: ['#451A03', '#92400E', '#D97706'] as const,
+  WORK: ['#450A0A', '#991B1B', '#EA580C'] as const,
+  REST: ['#0C1929', '#1E3A5F', '#2563EB'] as const,
+  COMPLETE: ['#052E16', '#166534', '#16A34A'] as const,
+} as const
+
+export const ACCENT = {
+  ORANGE: '#F97316',
+  ORANGE_GLOW: '#FB923C',
+  RED_HOT: '#EF4444',
+  GOLD: '#FBBF24',
+  WHITE: '#FFFFFF',
+  WHITE_DIM: 'rgba(255, 255, 255, 0.6)',
+  WHITE_FAINT: 'rgba(255, 255, 255, 0.15)',
+} as const
+
+export const BRAND = {
+  PRIMARY: '#F97316',
+  PRIMARY_LIGHT: '#FB923C',
+  SECONDARY: '#FBBF24',
+  DANGER: '#EF4444',
+  SUCCESS: '#22C55E',
+  INFO: '#3B82F6',
+} as const
+
+export const SURFACE = {
+  BASE: '#0A0A14',
+  RAISED: '#12101F',
+  ELEVATED: '#1E1E2E',
+  OVERLAY_LIGHT: 'rgba(255, 255, 255, 0.08)',
+  OVERLAY_MEDIUM: 'rgba(255, 255, 255, 0.15)',
+  OVERLAY_STRONG: 'rgba(255, 255, 255, 0.25)',
+  SCRIM: 'rgba(0, 0, 0, 0.3)',
+} as const
+
+export const TEXT = {
+  PRIMARY: '#FFFFFF',
+  SECONDARY: 'rgba(255, 255, 255, 0.85)',
+  TERTIARY: 'rgba(255, 255, 255, 0.75)',
+  MUTED: 'rgba(255, 255, 255, 0.6)',
+  HINT: 'rgba(255, 255, 255, 0.45)',
+  DISABLED: 'rgba(255, 255, 255, 0.15)',
+} as const
+
+export const BORDER = {
+  SUBTLE: 'rgba(255, 255, 255, 0.05)',
+  LIGHT: 'rgba(255, 255, 255, 0.06)',
+  MEDIUM: 'rgba(255, 255, 255, 0.15)',
+  STRONG: 'rgba(255, 255, 255, 0.3)',
+} as const
+
+export const APP_GRADIENTS = {
+  HOME: ['#0A0A14', '#1A0E2E', '#2D1810'] as const,
+} as const
+
+export const GLASS = {
+  FILL: 'rgba(255, 255, 255, 0.03)',
+  FILL_MEDIUM: 'rgba(255, 255, 255, 0.06)',
+  FILL_STRONG: 'rgba(255, 255, 255, 0.10)',
+  BORDER: 'rgba(255, 255, 255, 0.08)',
+  BORDER_TOP: 'rgba(255, 255, 255, 0.15)',
+  BLUR_LIGHT: 15,
+  BLUR_MEDIUM: 25,
+  BLUR_HEAVY: 40,
+  BLUR_ATMOSPHERE: 60,
+} as const
--- a/src/shared/constants/index.ts
+++ b/src/shared/constants/index.ts
@@ -0,0 +1,16 @@
+export {
+  PHASE_COLORS,
+  PHASE_GRADIENTS,
+  ACCENT,
+  BRAND,
+  SURFACE,
+  TEXT,
+  BORDER,
+  APP_GRADIENTS,
+  GLASS,
+} from './colors'
+export { TYPOGRAPHY } from './typography'
+export { SPACING, LAYOUT } from './spacing'
+export { SHADOW, TEXT_SHADOW } from './shadows'
+export { RADIUS } from './borderRadius'
+export { DURATION, EASING, SPRING, ANIMATION } from './animations'
--- a/src/shared/constants/shadows.ts
+++ b/src/shared/constants/shadows.ts
@@ -0,0 +1,44 @@
+import type { TextStyle, ViewStyle } from 'react-native'
+
+export const SHADOW = {
+  BRAND_GLOW: {
+    shadowColor: '#F97316',
+    shadowOffset: { width: 0, height: 4 },
+    shadowOpacity: 0.5,
+    shadowRadius: 20,
+    elevation: 12,
+  } as ViewStyle,
+
+  WHITE_GLOW: {
+    shadowColor: '#FFFFFF',
+    shadowOffset: { width: 0, height: 0 },
+    shadowOpacity: 0.8,
+    shadowRadius: 6,
+  } as ViewStyle,
+} as const
+
+export const TEXT_SHADOW = {
+  BRAND: {
+    textShadowColor: 'rgba(249, 115, 22, 0.5)',
+    textShadowOffset: { width: 0, height: 0 },
+    textShadowRadius: 30,
+  } as TextStyle,
+
+  WHITE_SOFT: {
+    textShadowColor: 'rgba(255, 255, 255, 0.25)',
+    textShadowOffset: { width: 0, height: 0 },
+    textShadowRadius: 30,
+  } as TextStyle,
+
+  WHITE_MEDIUM: {
+    textShadowColor: 'rgba(255, 255, 255, 0.3)',
+    textShadowOffset: { width: 0, height: 0 },
+    textShadowRadius: 20,
+  } as TextStyle,
+
+  DANGER: {
+    textShadowColor: 'rgba(239, 68, 68, 0.6)',
+    textShadowOffset: { width: 0, height: 0 },
+    textShadowRadius: 40,
+  } as TextStyle,
+} as const
--- a/src/shared/constants/spacing.ts
+++ b/src/shared/constants/spacing.ts
@@ -0,0 +1,25 @@
+export const SPACING = {
+  0: 0,
+  0.5: 2,
+  1: 4,
+  1.5: 6,
+  2: 8,
+  2.5: 10,
+  3: 12,
+  3.5: 14,
+  4: 16,
+  5: 20,
+  6: 24,
+  8: 32,
+  10: 40,
+  12: 48,
+  14: 56,
+  15: 60,
+} as const
+
+export const LAYOUT = {
+  PAGE_HORIZONTAL: 24,
+  SECTION_GAP: 40,
+  INLINE_GAP: 16,
+  CONTROLS_GAP: 32,
+} as const
--- a/src/shared/constants/typography.ts
+++ b/src/shared/constants/typography.ts
@@ -0,0 +1,73 @@
+import type { TextStyle } from 'react-native'
+
+export const TYPOGRAPHY = {
+  countdown: {
+    fontSize: 140,
+    fontWeight: '900',
+    fontVariant: ['tabular-nums'],
+  } as TextStyle,
+
+  timeDisplay: {
+    fontSize: 72,
+    fontWeight: '900',
+    fontVariant: ['tabular-nums'],
+  } as TextStyle,
+
+  brandTitle: {
+    fontSize: 56,
+    fontWeight: '900',
+    letterSpacing: 12,
+  } as TextStyle,
+
+  displayLarge: {
+    fontSize: 42,
+    fontWeight: '900',
+    letterSpacing: 4,
+  } as TextStyle,
+
+  displaySmall: {
+    fontSize: 32,
+    fontWeight: '900',
+    letterSpacing: 20,
+  } as TextStyle,
+
+  buttonHero: {
+    fontSize: 30,
+    fontWeight: '900',
+    letterSpacing: 5,
+  } as TextStyle,
+
+  heading: {
+    fontSize: 24,
+    fontWeight: '800',
+  } as TextStyle,
+
+  buttonMedium: {
+    fontSize: 20,
+    fontWeight: '700',
+    letterSpacing: 2,
+  } as TextStyle,
+
+  body: {
+    fontSize: 18,
+    fontWeight: '700',
+  } as TextStyle,
+
+  caption: {
+    fontSize: 16,
+    fontWeight: '500',
+  } as TextStyle,
+
+  label: {
+    fontSize: 15,
+    fontWeight: '800',
+    letterSpacing: 1,
+  } as TextStyle,
+
+  overline: {
+    fontSize: 11,
+    fontWeight: '600',
+    textTransform: 'uppercase',
+    letterSpacing: 1,
+  } as TextStyle,
+} as const