complete Android build setup and study flow

Add a real Gradle wrapper, local SDK wiring, and the missing Android study screens so the module builds cleanly.

.gitignore

@@ -1,2 +1,4 @@
 target/
 build/
+.gradle/
+local.properties

mobile/android-app/app/build.gradle.kts

@@ -0,0 +1,70 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
+    id("org.jetbrains.kotlin.plugin.serialization")
+}
+
+android {
+    namespace = "com.hermes.study"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.hermes.study"
+        minSdk = 26
+        targetSdk = 35
+        versionCode = 1
+        versionName = "0.1.0"
+
+        buildConfigField("String", "API_BASE_URL", "\"http://10.0.2.2:3000/\"")
+    }
+
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    implementation(platform("androidx.compose:compose-bom:2024.06.00"))
+    implementation("androidx.activity:activity-compose:1.9.1")
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.4")
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.8.4")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.4")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.4")
+    implementation("androidx.compose.foundation:foundation")
+    implementation("androidx.compose.animation:animation")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-extended")
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("com.google.android.material:material:1.12.0")
+    implementation("androidx.navigation:navigation-compose:2.7.7")
+    implementation("androidx.media3:media3-common:1.4.1")
+    implementation("androidx.media3:media3-exoplayer:1.4.1")
+    implementation("androidx.media3:media3-ui:1.4.1")
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.7")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1")
+
+    debugImplementation("androidx.compose.ui:ui-tooling")
+    debugImplementation("androidx.compose.ui:ui-test-manifest")
+}

mobile/android-app/app/src/main/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:name=".HermesApplication"
+        android:allowBackup="true"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Hermes">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.Hermes">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

mobile/android-app/app/src/main/java/com/hermes/study/HermesAppContainer.kt

@@ -0,0 +1,32 @@
+package com.hermes.study
+
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.hermes.study.core.analytics.HermesAnalyticsTracker
+import com.hermes.study.core.localization.HermesLocalizationStore
+import com.hermes.study.core.media.HermesPlayerCoordinator
+import com.hermes.study.core.network.HermesApiClient
+import com.hermes.study.data.HermesRepository
+import okhttp3.HttpUrl.Companion.toHttpUrl
+
+class HermesAppContainer(context: Context) {
+    val localizationStore = HermesLocalizationStore(context.applicationContext)
+    val analyticsTracker = HermesAnalyticsTracker()
+    val apiClient = HermesApiClient(BuildConfig.API_BASE_URL.toHttpUrl())
+    val repository = HermesRepository(apiClient)
+    val playerCoordinator = HermesPlayerCoordinator(context.applicationContext)
+
+    fun feedViewModelFactory(): ViewModelProvider.Factory = HermesViewModelFactory {
+        com.hermes.study.feature.feed.FeedViewModel(repository, localizationStore, analyticsTracker)
+    }
+
+    fun roundViewModelFactory(): ViewModelProvider.Factory = HermesViewModelFactory {
+        com.hermes.study.feature.round.RoundViewModel(repository, localizationStore, analyticsTracker, playerCoordinator)
+    }
+}
+
+class HermesViewModelFactory<T : ViewModel>(private val creator: () -> T) : ViewModelProvider.Factory {
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T = creator() as T
+}

mobile/android-app/app/src/main/java/com/hermes/study/HermesApplication.kt

@@ -0,0 +1,13 @@
+package com.hermes.study
+
+import android.app.Application
+
+class HermesApplication : Application() {
+    lateinit var container: HermesAppContainer
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+        container = HermesAppContainer(applicationContext)
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/HermesStudyApp.kt

@@ -0,0 +1,110 @@
+package com.hermes.study
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.compose.foundation.layout.width
+import com.hermes.study.R
+import com.hermes.study.core.designsystem.HermesPalette
+import com.hermes.study.core.designsystem.HermesSecondaryButton
+import com.hermes.study.core.designsystem.HermesStudyTheme
+import com.hermes.study.feature.feed.FeedScreen
+import com.hermes.study.feature.feed.FeedViewModel
+import com.hermes.study.feature.session.SessionView
+import com.hermes.study.feature.settings.SettingsView
+import com.hermes.study.feature.round.RoundScreen
+import com.hermes.study.feature.round.RoundViewModel
+import androidx.compose.material3.ExperimentalMaterial3Api
+
+@Composable
+fun HermesStudyApp(container: HermesAppContainer) {
+    val feedViewModel: FeedViewModel = viewModel(factory = container.feedViewModelFactory())
+    val roundViewModel: RoundViewModel = viewModel(factory = container.roundViewModelFactory())
+    val localeCode by container.localizationStore.localeCode.collectAsStateWithLifecycle()
+    val feedState by feedViewModel.uiState.collectAsStateWithLifecycle()
+    val roundState by roundViewModel.uiState.collectAsStateWithLifecycle()
+
+    Scaffold(
+        topBar = {
+            HermesAppBar(
+                title = container.localizationStore.string(localeCode, R.string.app_name),
+                localeCode = localeCode,
+                onLocaleSelected = container.localizationStore::setLocale,
+            )
+        },
+        containerColor = HermesPalette.colors.background
+    ) { padding ->
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(padding),
+            contentPadding = PaddingValues(20.dp),
+            verticalArrangement = Arrangement.spacedBy(20.dp)
+        ) {
+            item {
+                FeedScreen(
+                    uiState = feedState,
+                    onWatchPreview = feedViewModel::onWatchPreview
+                )
+            }
+            item {
+                RoundScreen(
+                    uiState = roundState,
+                    playerCoordinator = container.playerCoordinator,
+                    onSelectOutcome = roundViewModel::onSelectOutcome,
+                    onConfirmSelection = roundViewModel::onConfirmSelection,
+                    onRevealComplete = roundViewModel::onRevealAcknowledged,
+                    onNextRound = roundViewModel::onNextRound
+                )
+            }
+            item {
+                SessionView(
+                    localizationStore = container.localizationStore,
+                    localeCode = localeCode,
+                )
+            }
+            item {
+                SettingsView(
+                    localizationStore = container.localizationStore,
+                    localeCode = localeCode,
+                )
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun HermesAppBar(
+    title: String,
+    localeCode: String,
+    onLocaleSelected: (String) -> Unit,
+) {
+    androidx.compose.material3.CenterAlignedTopAppBar(
+        title = { Text(text = title) },
+        actions = {
+            HermesSecondaryButton(text = "EN", selected = localeCode == "en", onClick = { onLocaleSelected("en") })
+            androidx.compose.foundation.layout.Spacer(modifier = Modifier.width(8.dp))
+            HermesSecondaryButton(text = "SV", selected = localeCode == "sv", onClick = { onLocaleSelected("sv") })
+        },
+        colors = TopAppBarDefaults.centerAlignedTopAppBarColors(
+            containerColor = HermesPalette.colors.background
+        )
+    )
+}

mobile/android-app/app/src/main/java/com/hermes/study/MainActivity.kt

@@ -0,0 +1,20 @@
+package com.hermes.study
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import com.hermes.study.core.designsystem.HermesStudyTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        val app = application as HermesApplication
+
+        setContent {
+            HermesStudyTheme {
+                HermesStudyApp(app.container)
+            }
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/analytics/HermesAnalyticsTracker.kt

@@ -0,0 +1,26 @@
+package com.hermes.study.core.analytics
+
+import android.util.Log
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+
+data class HermesTrackedEvent(
+    val name: String,
+    val attributes: Map<String, String>,
+    val timestamp: Instant,
+)
+
+class HermesAnalyticsTracker {
+    private val eventsFlow = MutableSharedFlow<HermesTrackedEvent>(extraBufferCapacity = 64)
+
+    val events: SharedFlow<HermesTrackedEvent> = eventsFlow.asSharedFlow()
+
+    fun track(name: String, attributes: Map<String, String> = emptyMap()) {
+        val event = HermesTrackedEvent(name, attributes, Clock.System.now())
+        eventsFlow.tryEmit(event)
+        Log.d("HermesAnalytics", "${event.name} ${event.attributes}")
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/designsystem/HermesTheme.kt

@@ -0,0 +1,150 @@
+package com.hermes.study.core.designsystem
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+
+object HermesPalette {
+    val colors = HermesColors
+}
+
+object HermesColors {
+    val background = Color(0xFF0A0D14)
+    val surface = Color(0xFF171B24)
+    val surfaceElevated = Color(0xFF222838)
+    val accent = Color(0xFFDFBF5B)
+    val accentSoft = Color(0x22DFBF5B)
+    val positive = Color(0xFF56C28F)
+    val warning = Color(0xFFF0B14C)
+    val textPrimary = Color.White
+    val textSecondary = Color(0xFFB9C0D0)
+    val textTertiary = Color(0x80B9C0D0)
+}
+
+private val HermesColorScheme = darkColorScheme(
+    primary = HermesColors.accent,
+    onPrimary = HermesColors.background,
+    secondary = HermesColors.surfaceElevated,
+    onSecondary = HermesColors.textPrimary,
+    background = HermesColors.background,
+    onBackground = HermesColors.textPrimary,
+    surface = HermesColors.surface,
+    onSurface = HermesColors.textPrimary,
+)
+
+private val HermesShapes = androidx.compose.material3.Shapes(
+    extraSmall = RoundedCornerShape(12.dp),
+    small = RoundedCornerShape(16.dp),
+    medium = RoundedCornerShape(24.dp),
+    large = RoundedCornerShape(28.dp),
+    extraLarge = RoundedCornerShape(32.dp),
+)
+
+@Composable
+fun HermesStudyTheme(content: @Composable () -> Unit) {
+    MaterialTheme(
+        colorScheme = HermesColorScheme,
+        typography = MaterialTheme.typography,
+        shapes = HermesShapes,
+        content = content,
+    )
+}
+
+@Composable
+fun HermesCard(modifier: Modifier = Modifier, elevated: Boolean = false, content: @Composable () -> Unit) {
+    Card(
+        modifier = modifier.fillMaxWidth(),
+        shape = HermesShapes.large,
+        colors = CardDefaults.cardColors(
+            containerColor = if (elevated) HermesColors.surfaceElevated else HermesColors.surface,
+        ),
+        elevation = CardDefaults.cardElevation(defaultElevation = if (elevated) 10.dp else 4.dp),
+        content = {
+            Column(modifier = Modifier.padding(20.dp)) {
+                content()
+            }
+        },
+    )
+}
+
+@Composable
+fun HermesSectionHeader(title: String, subtitle: String, modifier: Modifier = Modifier) {
+    Column(modifier = modifier.fillMaxWidth()) {
+        Text(text = title, color = HermesColors.textPrimary, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
+        Spacer(modifier = Modifier.size(6.dp))
+        Text(text = subtitle, color = HermesColors.textSecondary, style = MaterialTheme.typography.bodyMedium)
+    }
+}
+
+@Composable
+fun HermesMetricChip(label: String, value: String, modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .heightIn(min = 64.dp)
+    ) {
+        Card(
+            modifier = Modifier.fillMaxWidth(),
+            colors = CardDefaults.cardColors(containerColor = HermesColors.surfaceElevated),
+            shape = HermesShapes.medium,
+        ) {
+            Column(modifier = Modifier.padding(horizontal = 14.dp, vertical = 12.dp)) {
+                Text(text = label, color = HermesColors.textTertiary, style = MaterialTheme.typography.labelSmall)
+                Text(text = value, color = HermesColors.textPrimary, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold)
+            }
+        }
+    }
+}
+
+@Composable
+fun HermesCountdownBadge(label: String, value: String, warning: Boolean = false, modifier: Modifier = Modifier) {
+    Card(
+        modifier = modifier,
+        colors = CardDefaults.cardColors(containerColor = if (warning) HermesColors.warning.copy(alpha = 0.18f) else HermesColors.accentSoft),
+        shape = HermesShapes.medium,
+    ) {
+        Column(modifier = Modifier.padding(horizontal = 14.dp, vertical = 12.dp)) {
+            Text(text = label, color = HermesColors.textTertiary, style = MaterialTheme.typography.labelSmall)
+            Text(text = value, color = if (warning) HermesColors.warning else HermesColors.accent, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold)
+        }
+    }
+}
+
+@Composable
+fun HermesPrimaryButton(text: String, onClick: () -> Unit, modifier: Modifier = Modifier, enabled: Boolean = true) {
+    Button(
+        onClick = onClick,
+        enabled = enabled,
+        modifier = modifier.fillMaxWidth(),
+        colors = ButtonDefaults.buttonColors(containerColor = HermesColors.accent, contentColor = HermesColors.background),
+        shape = HermesShapes.medium,
+    ) { Text(text) }
+}
+
+@Composable
+fun HermesSecondaryButton(text: String, selected: Boolean, onClick: () -> Unit, modifier: Modifier = Modifier) {
+    Button(
+        onClick = onClick,
+        modifier = modifier,
+        colors = ButtonDefaults.buttonColors(
+            containerColor = if (selected) HermesColors.accent else HermesColors.surfaceElevated,
+            contentColor = if (selected) HermesColors.background else HermesColors.textPrimary,
+        ),
+        shape = HermesShapes.small,
+    ) { Text(text) }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/gestures/HermesGestures.kt

@@ -0,0 +1,13 @@
+package com.hermes.study.core.gestures
+
+import androidx.compose.foundation.gestures.detectVerticalDragGestures
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.pointerInput
+
+fun Modifier.hermesSwipeDown(onSwipeDown: () -> Unit): Modifier = pointerInput(onSwipeDown) {
+    detectVerticalDragGestures { _, dragAmount ->
+        if (dragAmount > 32f) {
+            onSwipeDown()
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/haptics/HermesHaptics.kt

@@ -0,0 +1,14 @@
+package com.hermes.study.core.haptics
+
+import android.view.HapticFeedbackConstants
+import android.view.View
+
+class HermesHaptics(private val view: View) {
+    fun selectionAccepted() {
+        view.performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP)
+    }
+
+    fun marketLocked() {
+        view.performHapticFeedback(HapticFeedbackConstants.CONFIRM)
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/localization/HermesLocalizationStore.kt

@@ -0,0 +1,33 @@
+package com.hermes.study.core.localization
+
+import android.content.Context
+import android.content.res.Configuration
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import java.util.Locale
+
+class HermesLocalizationStore(private val appContext: Context) {
+    private val supportedLocales = setOf("en", "sv")
+    private val _localeCode = MutableStateFlow(defaultLocale())
+
+    val localeCode: StateFlow<String> = _localeCode.asStateFlow()
+
+    fun setLocale(localeCode: String) {
+        _localeCode.value = normalize(localeCode)
+    }
+
+    fun string(resId: Int): String = localizedContext(localeCode.value).getString(resId)
+
+    fun string(localeCode: String, resId: Int): String = localizedContext(normalize(localeCode)).getString(resId)
+
+    private fun localizedContext(localeCode: String): Context {
+        val configuration = Configuration(appContext.resources.configuration)
+        configuration.setLocale(Locale.forLanguageTag(localeCode))
+        return appContext.createConfigurationContext(configuration)
+    }
+
+    private fun defaultLocale(): String = normalize(Locale.getDefault().language)
+
+    private fun normalize(localeCode: String): String = if (supportedLocales.contains(localeCode)) localeCode else "en"
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/media/HermesPlayerCoordinator.kt

@@ -0,0 +1,42 @@
+package com.hermes.study.core.media
+
+import android.content.Context
+import android.net.Uri
+import androidx.media3.common.MediaItem
+import androidx.media3.exoplayer.ExoPlayer
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class HermesPlayerCoordinator(context: Context) {
+    val player: ExoPlayer = ExoPlayer.Builder(context.applicationContext).build()
+
+    private val _isPlaying = MutableStateFlow(false)
+    val isPlaying: StateFlow<Boolean> = _isPlaying.asStateFlow()
+
+    fun preparePreview(mediaUrl: String) {
+        player.setMediaItem(MediaItem.fromUri(Uri.parse(mediaUrl)))
+        player.prepare()
+        player.playWhenReady = true
+        _isPlaying.value = true
+    }
+
+    fun play() {
+        player.play()
+        _isPlaying.value = true
+    }
+
+    fun pause() {
+        player.pause()
+        _isPlaying.value = false
+    }
+
+    fun restart(mediaUrl: String) {
+        preparePreview(mediaUrl)
+        player.seekTo(0)
+    }
+
+    fun release() {
+        player.release()
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/media/StudyVideoPlayerView.kt

@@ -0,0 +1,30 @@
+package com.hermes.study.core.media
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.media3.ui.PlayerView
+
+@Composable
+fun StudyVideoPlayerView(
+    coordinator: HermesPlayerCoordinator,
+    modifier: Modifier = Modifier,
+) {
+    DisposableEffect(coordinator.player) {
+        onDispose {
+            // Player lifecycle is controlled by the coordinator.
+        }
+    }
+
+    AndroidView(
+        modifier = modifier,
+        factory = { context ->
+            PlayerView(context).apply {
+                useController = false
+                player = coordinator.player
+            }
+        },
+        update = { view -> view.player = coordinator.player },
+    )
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/network/HermesApiClient.kt

@@ -0,0 +1,128 @@
+package com.hermes.study.core.network
+
+import com.hermes.study.domain.HermesAnalyticsBatchRequest
+import com.hermes.study.domain.HermesBetIntentRequest
+import com.hermes.study.domain.HermesBetIntentResponse
+import com.hermes.study.domain.HermesEvent
+import com.hermes.study.domain.HermesExperimentConfig
+import com.hermes.study.domain.HermesLocalizationBundle
+import com.hermes.study.domain.HermesMarket
+import com.hermes.study.domain.HermesOddsVersion
+import com.hermes.study.domain.HermesSessionResponse
+import com.hermes.study.domain.HermesSessionStartRequest
+import com.hermes.study.domain.HermesSettlement
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonNamingStrategy
+import okhttp3.HttpUrl
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+
+@OptIn(kotlinx.serialization.ExperimentalSerializationApi::class)
+class HermesApiClient(
+    private val baseUrl: HttpUrl,
+    private val client: OkHttpClient = OkHttpClient(),
+    private val json: Json = Json {
+        ignoreUnknownKeys = true
+        encodeDefaults = false
+        explicitNulls = false
+        namingStrategy = JsonNamingStrategy.SnakeCase
+    },
+    ) {
+    private val jsonMediaType = "application/json; charset=utf-8".toMediaType()
+
+    suspend fun startSession(request: HermesSessionStartRequest): HermesSessionResponse = post("api/v1/session/start", request)
+
+    suspend fun endSession(): HermesSessionResponse = post("api/v1/session/end")
+
+    suspend fun currentSession(): HermesSessionResponse = get("api/v1/session/me")
+
+    suspend fun nextEvent(): HermesEvent = get("api/v1/feed/next")
+
+    suspend fun eventManifest(eventId: String): com.hermes.study.domain.HermesEventManifest = get("api/v1/events/$eventId/manifest")
+
+    suspend fun markets(eventId: String): List<HermesMarket> = get("api/v1/events/$eventId/markets")
+
+    suspend fun currentOdds(marketId: String): HermesOddsVersion = get("api/v1/markets/$marketId/odds/current")
+
+    suspend fun submitBetIntent(request: HermesBetIntentRequest): HermesBetIntentResponse = post("api/v1/bets/intent", request)
+
+    suspend fun betIntent(id: String): HermesBetIntentResponse = get("api/v1/bets/$id")
+
+    suspend fun settlement(eventId: String): HermesSettlement = get("api/v1/events/$eventId/result")
+
+    suspend fun experimentConfig(): HermesExperimentConfig = get("api/v1/experiments/config")
+
+    suspend fun localization(localeCode: String): HermesLocalizationBundle = get("api/v1/localization/$localeCode")
+
+    suspend fun submitAnalyticsBatch(request: HermesAnalyticsBatchRequest) {
+        postNoContent("api/v1/analytics/batch", request)
+    }
+
+    private suspend inline fun <reified T> get(path: String): T = withContext(Dispatchers.IO) {
+        execute(path = path, method = "GET")
+    }
+
+    private suspend inline fun <reified T> post(path: String): T = withContext(Dispatchers.IO) {
+        execute(path = path, method = "POST")
+    }
+
+    private suspend inline fun <reified T, reified B> post(path: String, body: B): T = withContext(Dispatchers.IO) {
+        execute(path = path, method = "POST", bodyJson = json.encodeToString(body))
+    }
+
+    private suspend inline fun <reified B> postNoContent(path: String, body: B) {
+        withContext(Dispatchers.IO) {
+            executeNoContent(path = path, method = "POST", bodyJson = json.encodeToString(body))
+        }
+    }
+
+    private inline fun <reified T> execute(path: String, method: String, bodyJson: String? = null): T {
+        val requestBody = when {
+            bodyJson != null -> bodyJson.toRequestBody(jsonMediaType)
+            method == "GET" -> null
+            else -> "{}".toRequestBody(jsonMediaType)
+        }
+
+        val requestBuilder = Request.Builder()
+            .url(baseUrl.newBuilder().addEncodedPathSegments(path.trimStart('/')).build())
+            .method(method, requestBody)
+            .header("Accept", "application/json")
+
+        client.newCall(requestBuilder.build()).execute().use { response ->
+            if (!response.isSuccessful) {
+                throw HermesApiException.HttpStatus(response.code, response.body?.string().orEmpty())
+            }
+
+            val payload = response.body?.string().orEmpty()
+            return json.decodeFromString(payload)
+        }
+    }
+
+    private fun executeNoContent(path: String, method: String, bodyJson: String? = null) {
+        val requestBody = when {
+            bodyJson != null -> bodyJson.toRequestBody(jsonMediaType)
+            method == "GET" -> null
+            else -> "{}".toRequestBody(jsonMediaType)
+        }
+
+        val requestBuilder = Request.Builder()
+            .url(baseUrl.newBuilder().addEncodedPathSegments(path.trimStart('/')).build())
+            .method(method, requestBody)
+            .header("Accept", "application/json")
+
+        client.newCall(requestBuilder.build()).execute().use { response ->
+            if (!response.isSuccessful) {
+                throw HermesApiException.HttpStatus(response.code, response.body?.string().orEmpty())
+            }
+        }
+    }
+}
+
+sealed class HermesApiException(message: String) : RuntimeException(message) {
+    class HttpStatus(val code: Int, val body: String) : HermesApiException("HTTP $code: $body")
+}

mobile/android-app/app/src/main/java/com/hermes/study/core/network/HermesApiModels.kt

@@ -0,0 +1,3 @@
+package com.hermes.study.core.network
+
+// Placeholder for future API-specific mapping helpers.

mobile/android-app/app/src/main/java/com/hermes/study/data/HermesRepository.kt

@@ -0,0 +1,65 @@
+package com.hermes.study.data
+
+import com.hermes.study.core.network.HermesApiClient
+import com.hermes.study.domain.HermesAnalyticsBatchRequest
+import com.hermes.study.domain.HermesBetIntentRequest
+import com.hermes.study.domain.HermesBetIntentResponse
+import com.hermes.study.domain.HermesExperimentConfig
+import com.hermes.study.domain.HermesLocalizationBundle
+import com.hermes.study.domain.HermesMarket
+import com.hermes.study.domain.HermesOddsVersion
+import com.hermes.study.domain.HermesSessionResponse
+import com.hermes.study.domain.HermesSettlement
+import com.hermes.study.domain.StudyRound
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.flowOf
+
+class HermesRepository(private val apiClient: HermesApiClient) {
+    private val roundState = MutableStateFlow(SampleStudyData.round())
+
+    val currentRound: StateFlow<StudyRound> = roundState.asStateFlow()
+
+    fun observeRound(): Flow<StudyRound> = roundState
+
+    fun observeFeed(): Flow<StudyRound> = roundState
+
+    suspend fun refreshRoundFromNetwork(): StudyRound {
+        roundState.value = SampleStudyData.round()
+        return roundState.value
+    }
+
+    suspend fun startSession(request: com.hermes.study.domain.HermesSessionStartRequest): HermesSessionResponse {
+        return apiClient.startSession(request)
+    }
+
+    suspend fun endSession(): HermesSessionResponse {
+        return apiClient.endSession()
+    }
+
+    suspend fun submitBetIntent(request: HermesBetIntentRequest): HermesBetIntentResponse {
+        return apiClient.submitBetIntent(request)
+    }
+
+    suspend fun currentOdds(marketId: String): HermesOddsVersion {
+        return apiClient.currentOdds(marketId)
+    }
+
+    suspend fun settlement(eventId: String): HermesSettlement {
+        return apiClient.settlement(eventId)
+    }
+
+    suspend fun experimentConfig(): HermesExperimentConfig {
+        return apiClient.experimentConfig()
+    }
+
+    suspend fun localization(localeCode: String): HermesLocalizationBundle {
+        return apiClient.localization(localeCode)
+    }
+
+    suspend fun submitAnalyticsBatch(request: HermesAnalyticsBatchRequest) {
+        apiClient.submitAnalyticsBatch(request)
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/data/SampleStudyData.kt

@@ -0,0 +1,124 @@
+package com.hermes.study.data
+
+import com.hermes.study.domain.HermesAnalyticsAttributeInput
+import com.hermes.study.domain.HermesAnalyticsBatchRequest
+import com.hermes.study.domain.HermesAnalyticsEventInput
+import com.hermes.study.domain.HermesBetIntentRequest
+import com.hermes.study.domain.HermesBetIntentResponse
+import com.hermes.study.domain.HermesEvent
+import com.hermes.study.domain.HermesEventMedia
+import com.hermes.study.domain.HermesExperimentConfig
+import com.hermes.study.domain.HermesLocalizationBundle
+import com.hermes.study.domain.HermesMarket
+import com.hermes.study.domain.HermesOddsVersion
+import com.hermes.study.domain.HermesOutcome
+import com.hermes.study.domain.HermesOutcomeOdds
+import com.hermes.study.domain.HermesSessionResponse
+import com.hermes.study.domain.HermesSettlement
+import com.hermes.study.domain.StudyRound
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+
+object SampleStudyData {
+    fun round(): StudyRound {
+        val now: Instant = Clock.System.now()
+        val lockAt = Instant.fromEpochMilliseconds(now.toEpochMilliseconds() + 47_000)
+        val settleAt = Instant.fromEpochMilliseconds(now.toEpochMilliseconds() + 92_000)
+        val event = HermesEvent(
+            id = "11111111-1111-1111-1111-111111111111",
+            sportType = "football",
+            sourceRef = "sample-event-001",
+            titleEn = "Late winner chance",
+            titleSv = "Möjlighet till segermål",
+            status = "prefetch_ready",
+            previewStartMs = 0,
+            previewEndMs = 45_000,
+            revealStartMs = 50_000,
+            revealEndMs = 90_000,
+            lockAt = lockAt,
+            settleAt = settleAt,
+        )
+
+        val media = HermesEventMedia(
+            id = "33333333-3333-3333-3333-333333333333",
+            eventId = event.id,
+            mediaType = "hls_main",
+            hlsMasterUrl = "https://cdn.example.com/hermes/sample-event/master.m3u8",
+            posterUrl = "https://cdn.example.com/hermes/sample-event/poster.jpg",
+            durationMs = 90_000,
+            previewStartMs = 0,
+            previewEndMs = 45_000,
+            revealStartMs = 50_000,
+            revealEndMs = 90_000,
+        )
+
+        val home = HermesOutcome(
+            id = "44444444-4444-4444-4444-444444444444",
+            marketId = "22222222-2222-2222-2222-222222222222",
+            outcomeCode = "home",
+            labelKey = "round.home",
+            sortOrder = 1,
+        )
+        val away = HermesOutcome(
+            id = "55555555-5555-5555-5555-555555555555",
+            marketId = "22222222-2222-2222-2222-222222222222",
+            outcomeCode = "away",
+            labelKey = "round.away",
+            sortOrder = 2,
+        )
+
+        val market = HermesMarket(
+            id = "22222222-2222-2222-2222-222222222222",
+            eventId = event.id,
+            questionKey = "market.sample.winner",
+            marketType = "winner",
+            status = "open",
+            lockAt = lockAt,
+            settlementRuleKey = "settle_on_match_winner",
+            outcomes = listOf(home, away),
+        )
+
+        val oddsVersion = HermesOddsVersion(
+            id = "66666666-6666-6666-6666-666666666666",
+            marketId = market.id,
+            versionNo = 1,
+            createdAt = now,
+            isCurrent = true,
+            odds = listOf(
+                HermesOutcomeOdds(
+                    id = "77777777-7777-7777-7777-777777777777",
+                    oddsVersionId = "66666666-6666-6666-6666-666666666666",
+                    outcomeId = home.id,
+                    decimalOdds = 1.85,
+                    fractionalNum = 17,
+                    fractionalDen = 20,
+                ),
+                HermesOutcomeOdds(
+                    id = "88888888-8888-8888-8888-888888888888",
+                    oddsVersionId = "66666666-6666-6666-6666-666666666666",
+                    outcomeId = away.id,
+                    decimalOdds = 2.05,
+                    fractionalNum = 21,
+                    fractionalDen = 20,
+                ),
+            ),
+        )
+
+        val settlement = HermesSettlement(
+            id = "99999999-9999-9999-9999-999999999999",
+            marketId = market.id,
+            settledAt = settleAt,
+            winningOutcomeId = home.id,
+        )
+
+        return StudyRound(
+            event = event,
+            media = media,
+            market = market,
+            oddsVersion = oddsVersion,
+            settlement = settlement,
+        )
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/domain/HermesModels.kt

@@ -0,0 +1,172 @@
+package com.hermes.study.domain
+
+import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class HermesSessionStartRequest(
+    val externalRef: String? = null,
+    val localeCode: String? = null,
+    val devicePlatform: String? = null,
+    val deviceModel: String? = null,
+    val osVersion: String? = null,
+    val appVersion: String? = null,
+    val experimentVariant: String? = null,
+)
+
+@Serializable
+data class HermesSessionResponse(
+    val sessionId: String,
+    val userId: String,
+    val startedAt: Instant,
+    val endedAt: Instant? = null,
+    val experimentVariant: String,
+    val appVersion: String,
+    val deviceModel: String? = null,
+    val osVersion: String? = null,
+    val localeCode: String,
+    val devicePlatform: String,
+)
+
+@Serializable
+data class HermesEvent(
+    val id: String,
+    val sportType: String,
+    val sourceRef: String,
+    val titleEn: String,
+    val titleSv: String,
+    val status: String,
+    val previewStartMs: Int,
+    val previewEndMs: Int,
+    val revealStartMs: Int,
+    val revealEndMs: Int,
+    val lockAt: Instant,
+    val settleAt: Instant,
+)
+
+@Serializable
+data class HermesEventMedia(
+    val id: String,
+    val eventId: String,
+    val mediaType: String,
+    val hlsMasterUrl: String,
+    val posterUrl: String? = null,
+    val durationMs: Int,
+    val previewStartMs: Int,
+    val previewEndMs: Int,
+    val revealStartMs: Int,
+    val revealEndMs: Int,
+)
+
+@Serializable
+data class HermesEventManifest(
+    val event: HermesEvent,
+    val media: List<HermesEventMedia>,
+    val markets: List<HermesMarket>,
+)
+
+@Serializable
+data class HermesOutcome(
+    val id: String,
+    val marketId: String,
+    val outcomeCode: String,
+    val labelKey: String,
+    val sortOrder: Int,
+)
+
+@Serializable
+data class HermesMarket(
+    val id: String,
+    val eventId: String,
+    val questionKey: String,
+    val marketType: String,
+    val status: String,
+    val lockAt: Instant,
+    val settlementRuleKey: String,
+    val outcomes: List<HermesOutcome>,
+)
+
+@Serializable
+data class HermesOutcomeOdds(
+    val id: String,
+    val oddsVersionId: String,
+    val outcomeId: String,
+    val decimalOdds: Double,
+    val fractionalNum: Int,
+    val fractionalDen: Int,
+)
+
+@Serializable
+data class HermesOddsVersion(
+    val id: String,
+    val marketId: String,
+    val versionNo: Int,
+    val createdAt: Instant,
+    val isCurrent: Boolean,
+    val odds: List<HermesOutcomeOdds>,
+)
+
+@Serializable
+data class HermesBetIntentRequest(
+    val sessionId: String,
+    val eventId: String,
+    val marketId: String,
+    val outcomeId: String,
+    val idempotencyKey: String,
+    val clientSentAt: Instant,
+)
+
+@Serializable
+data class HermesBetIntentResponse(
+    val id: String,
+    val accepted: Boolean,
+    val acceptanceCode: String,
+    val acceptedOddsVersionId: String? = null,
+    val serverReceivedAt: Instant,
+)
+
+@Serializable
+data class HermesSettlement(
+    val id: String,
+    val marketId: String,
+    val settledAt: Instant,
+    val winningOutcomeId: String,
+)
+
+@Serializable
+data class HermesAnalyticsAttributeInput(
+    val key: String,
+    val value: String,
+)
+
+@Serializable
+data class HermesAnalyticsEventInput(
+    val eventName: String,
+    val occurredAt: Instant,
+    val attributes: List<HermesAnalyticsAttributeInput>? = null,
+)
+
+@Serializable
+data class HermesAnalyticsBatchRequest(
+    val events: List<HermesAnalyticsEventInput>,
+)
+
+@Serializable
+data class HermesExperimentConfig(
+    val variant: String,
+    val featureFlags: Map<String, Boolean>,
+)
+
+@Serializable
+data class HermesLocalizationBundle(
+    val localeCode: String,
+    val values: Map<String, String>,
+)
+
+data class StudyRound(
+    val event: HermesEvent,
+    val media: HermesEventMedia,
+    val market: HermesMarket,
+    val oddsVersion: HermesOddsVersion,
+    val settlement: HermesSettlement,
+)

mobile/android-app/app/src/main/java/com/hermes/study/feature/feed/FeedScreen.kt

@@ -0,0 +1,71 @@
+package com.hermes.study.feature.feed
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.unit.dp
+import com.hermes.study.core.designsystem.HermesCard
+import com.hermes.study.core.designsystem.HermesColors
+import com.hermes.study.core.designsystem.HermesMetricChip
+import com.hermes.study.core.designsystem.HermesPrimaryButton
+import com.hermes.study.core.designsystem.HermesSectionHeader
+
+@Composable
+fun FeedScreen(
+    uiState: FeedUiState,
+    onWatchPreview: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    HermesCard(modifier = modifier, elevated = true) {
+        Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
+            HermesSectionHeader(title = uiState.title, subtitle = uiState.subtitle)
+
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(220.dp)
+                    .clip(RoundedCornerShape(28.dp))
+                    .background(
+                        Brush.linearGradient(
+                            colors = listOf(HermesColors.surfaceElevated, HermesColors.background),
+                        ),
+                    )
+                    .padding(20.dp),
+                contentAlignment = Alignment.BottomStart,
+            ) {
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Text(
+                        text = uiState.heroTitle,
+                        style = MaterialTheme.typography.headlineSmall,
+                        color = HermesColors.textPrimary,
+                    )
+                    Text(
+                        text = uiState.heroSubtitle,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = HermesColors.textSecondary,
+                    )
+                }
+            }
+
+            Row(horizontalArrangement = Arrangement.spacedBy(12.dp), modifier = Modifier.fillMaxWidth()) {
+                HermesMetricChip(label = uiState.lockLabel, value = uiState.lockValue, modifier = Modifier.fillMaxWidth(0.5f))
+                HermesMetricChip(label = uiState.oddsLabel, value = uiState.oddsValue, modifier = Modifier.fillMaxWidth(0.5f))
+            }
+
+            HermesPrimaryButton(text = uiState.ctaText, onClick = onWatchPreview)
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/feed/FeedViewModel.kt

@@ -0,0 +1,106 @@
+package com.hermes.study.feature.feed
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.hermes.study.R
+import com.hermes.study.core.analytics.HermesAnalyticsTracker
+import com.hermes.study.core.localization.HermesLocalizationStore
+import com.hermes.study.data.HermesRepository
+import com.hermes.study.domain.StudyRound
+import java.util.Locale
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+
+data class FeedUiState(
+    val title: String,
+    val subtitle: String,
+    val heroTitle: String,
+    val heroSubtitle: String,
+    val lockLabel: String,
+    val lockValue: String,
+    val oddsLabel: String,
+    val oddsValue: String,
+    val ctaText: String,
+)
+
+class FeedViewModel(
+    repository: HermesRepository,
+    private val localizationStore: HermesLocalizationStore,
+    private val analyticsTracker: HermesAnalyticsTracker,
+) : ViewModel() {
+    private val roundFlow = repository.currentRound
+    private val localeFlow = localizationStore.localeCode
+    private val nowFlow = flow {
+        while (true) {
+            emit(Clock.System.now())
+            delay(1_000)
+        }
+    }
+
+    val uiState: StateFlow<FeedUiState> = combine(roundFlow, localeFlow, nowFlow) { round, localeCode, now ->
+        buildUiState(round = round, localeCode = localeCode, now = now)
+    }.stateIn(
+        scope = viewModelScope,
+        started = SharingStarted.Eagerly,
+        initialValue = buildUiState(
+            round = roundFlow.value,
+            localeCode = localeFlow.value,
+            now = Clock.System.now(),
+        ),
+    )
+
+    init {
+        analyticsTracker.track("feed_viewed", attributes = mapOf("screen_name" to "feed"))
+        analyticsTracker.track("screen_viewed", attributes = mapOf("screen_name" to "feed"))
+    }
+
+    fun onWatchPreview() {
+        analyticsTracker.track("next_round_requested", attributes = mapOf("screen_name" to "feed"))
+        analyticsTracker.track(
+            "cta_pressed",
+            attributes = mapOf("screen_name" to "feed", "action" to "watch_preview"),
+        )
+    }
+
+    private fun buildUiState(round: StudyRound, localeCode: String, now: Instant): FeedUiState {
+        return FeedUiState(
+            title = localized(localeCode, R.string.feed_title),
+            subtitle = localized(localeCode, R.string.feed_subtitle),
+            heroTitle = localized(localeCode, R.string.feed_hero_title),
+            heroSubtitle = localized(localeCode, R.string.feed_hero_subtitle),
+            lockLabel = localized(localeCode, R.string.feed_lock_label),
+            lockValue = formatCountdown(round.event.lockAt, now),
+            oddsLabel = localized(localeCode, R.string.feed_odds_label),
+            oddsValue = formatOdds(round),
+            ctaText = localized(localeCode, R.string.feed_cta),
+        )
+    }
+
+    private fun localized(localeCode: String, resId: Int): String {
+        return localizationStore.string(localeCode, resId)
+    }
+
+    private fun formatCountdown(lockAt: Instant, now: Instant): String {
+        val remainingMillis = (lockAt.toEpochMilliseconds() - now.toEpochMilliseconds()).coerceAtLeast(0)
+        val totalSeconds = (remainingMillis / 1_000).toInt()
+        val minutes = totalSeconds / 60
+        val seconds = totalSeconds % 60
+        return String.format(Locale.US, "%02d:%02d", minutes, seconds)
+    }
+
+    private fun formatOdds(round: StudyRound): String {
+        val oddsByOutcomeId = round.oddsVersion.odds.associateBy { it.outcomeId }
+        return round.market.outcomes
+            .sortedBy { it.sortOrder }
+            .mapNotNull { outcome ->
+                oddsByOutcomeId[outcome.id]?.decimalOdds?.let { String.format(Locale.US, "%.2f", it) }
+            }
+            .joinToString(" / ")
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/result/ResultPanel.kt

@@ -0,0 +1,60 @@
+package com.hermes.study.feature.result
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Cancel
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.hermes.study.core.designsystem.HermesColors
+import com.hermes.study.core.designsystem.HermesMetricChip
+import com.hermes.study.core.designsystem.HermesPrimaryButton
+import com.hermes.study.core.designsystem.HermesSectionHeader
+
+@Composable
+fun ResultPanel(
+    title: String,
+    subtitle: String,
+    selectionLabel: String,
+    selectionValue: String,
+    outcomeLabel: String,
+    outcomeValue: String,
+    didWin: Boolean,
+    winLabel: String,
+    loseLabel: String,
+    nextRoundTitle: String,
+    onNextRound: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(modifier = modifier, verticalArrangement = Arrangement.spacedBy(12.dp)) {
+        HermesSectionHeader(title = title, subtitle = subtitle)
+
+        Row(horizontalArrangement = Arrangement.spacedBy(12.dp), modifier = Modifier.fillMaxWidth()) {
+            HermesMetricChip(label = selectionLabel, value = selectionValue, modifier = Modifier.fillMaxWidth(0.5f))
+            HermesMetricChip(label = outcomeLabel, value = outcomeValue, modifier = Modifier.fillMaxWidth(0.5f))
+        }
+
+        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(10.dp)) {
+            Icon(
+                imageVector = if (didWin) Icons.Filled.CheckCircle else Icons.Filled.Cancel,
+                contentDescription = null,
+                tint = if (didWin) HermesColors.positive else HermesColors.warning,
+            )
+            Text(
+                text = if (didWin) winLabel else loseLabel,
+                style = MaterialTheme.typography.titleMedium,
+                color = HermesColors.textPrimary,
+            )
+        }
+
+        HermesPrimaryButton(text = nextRoundTitle, onClick = onNextRound)
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/reveal/RevealPanel.kt

@@ -0,0 +1,40 @@
+package com.hermes.study.feature.reveal
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.hermes.study.core.designsystem.HermesMetricChip
+import com.hermes.study.core.designsystem.HermesPrimaryButton
+import com.hermes.study.core.designsystem.HermesSectionHeader
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import com.hermes.study.core.designsystem.HermesColors
+
+@Composable
+fun RevealPanel(
+    title: String,
+    subtitle: String,
+    statusText: String,
+    selectionLabel: String,
+    selectionValue: String,
+    continueTitle: String,
+    onContinue: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(modifier = modifier, verticalArrangement = Arrangement.spacedBy(12.dp)) {
+        HermesSectionHeader(title = title, subtitle = subtitle)
+
+        HermesMetricChip(label = selectionLabel, value = selectionValue, modifier = Modifier.fillMaxWidth())
+
+        Text(
+            text = statusText,
+            style = MaterialTheme.typography.bodyMedium,
+            color = HermesColors.textSecondary,
+        )
+
+        HermesPrimaryButton(text = continueTitle, onClick = onContinue)
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/round/RoundScreen.kt

@@ -0,0 +1,125 @@
+package com.hermes.study.feature.round
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import com.hermes.study.core.designsystem.HermesColors
+import com.hermes.study.core.designsystem.HermesCountdownBadge
+import com.hermes.study.core.designsystem.HermesCard
+import com.hermes.study.core.designsystem.HermesMetricChip
+import com.hermes.study.core.media.HermesPlayerCoordinator
+import com.hermes.study.core.media.StudyVideoPlayerView
+import com.hermes.study.feature.reveal.RevealPanel
+import com.hermes.study.feature.result.ResultPanel
+import com.hermes.study.feature.selection.SelectionPanel
+
+@Composable
+fun RoundScreen(
+    uiState: RoundUiState,
+    playerCoordinator: HermesPlayerCoordinator,
+    onSelectOutcome: (String) -> Unit,
+    onConfirmSelection: () -> Unit,
+    onRevealComplete: () -> Unit,
+    onNextRound: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    HermesCard(modifier = modifier, elevated = true) {
+        Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
+            com.hermes.study.core.designsystem.HermesSectionHeader(title = uiState.title, subtitle = uiState.subtitle)
+
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(220.dp),
+            ) {
+                StudyVideoPlayerView(
+                    coordinator = playerCoordinator,
+                    modifier = Modifier.fillMaxSize(),
+                )
+
+                Column(
+                    modifier = Modifier
+                        .align(Alignment.TopEnd)
+                        .padding(12.dp),
+                    verticalArrangement = Arrangement.spacedBy(10.dp),
+                ) {
+                    HermesCountdownBadge(
+                        label = uiState.countdownLabel,
+                        value = uiState.countdownText,
+                        warning = uiState.countdownWarning,
+                    )
+
+                    HermesMetricChip(
+                        label = uiState.oddsLabel,
+                        value = uiState.oddsValue,
+                        modifier = Modifier.widthIn(min = 128.dp),
+                    )
+                }
+
+                Text(
+                    text = uiState.phaseLabel,
+                    modifier = Modifier
+                        .align(Alignment.BottomStart)
+                        .padding(12.dp)
+                        .background(
+                            color = Color.Black.copy(alpha = 0.35f),
+                            shape = RoundedCornerShape(999.dp),
+                        )
+                        .padding(horizontal = 12.dp, vertical = 8.dp),
+                    style = MaterialTheme.typography.labelMedium,
+                    color = HermesColors.textPrimary,
+                )
+            }
+
+            when (uiState.phase) {
+                RoundPhase.PREVIEW, RoundPhase.LOCKED -> SelectionPanel(
+                    statusText = uiState.selectionStatusText,
+                    options = uiState.selectionOptions,
+                    selectedOptionId = uiState.selectedOutcomeId,
+                    isLocked = uiState.selectionLocked,
+                    confirmTitle = uiState.confirmTitle,
+                    onSelect = { onSelectOutcome(it.id) },
+                    onConfirm = onConfirmSelection,
+                )
+
+                RoundPhase.REVEAL -> RevealPanel(
+                    title = uiState.revealTitle,
+                    subtitle = uiState.revealSubtitle,
+                    statusText = uiState.revealStatusText,
+                    selectionLabel = uiState.revealSelectionLabel,
+                    selectionValue = uiState.selectedOutcomeTitle,
+                    continueTitle = uiState.revealContinueTitle,
+                    onContinue = onRevealComplete,
+                )
+
+                RoundPhase.RESULT -> ResultPanel(
+                    title = uiState.resultTitle,
+                    subtitle = uiState.resultSubtitle,
+                    selectionLabel = uiState.resultSelectionLabel,
+                    selectionValue = uiState.selectedOutcomeTitle,
+                    outcomeLabel = uiState.resultOutcomeLabel,
+                    outcomeValue = uiState.winningOutcomeTitle,
+                    didWin = uiState.didWin,
+                    winLabel = uiState.resultWinLabel,
+                    loseLabel = uiState.resultLoseLabel,
+                    nextRoundTitle = uiState.resultNextRoundTitle,
+                    onNextRound = onNextRound,
+                )
+            }
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/round/RoundViewModel.kt

@@ -0,0 +1,351 @@
+package com.hermes.study.feature.round
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.hermes.study.R
+import com.hermes.study.core.analytics.HermesAnalyticsTracker
+import com.hermes.study.core.localization.HermesLocalizationStore
+import com.hermes.study.core.media.HermesPlayerCoordinator
+import com.hermes.study.data.HermesRepository
+import com.hermes.study.domain.HermesOutcome
+import com.hermes.study.domain.StudyRound
+import com.hermes.study.feature.selection.SelectionOptionUi
+import java.util.Locale
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+
+enum class RoundPhase {
+    PREVIEW,
+    LOCKED,
+    REVEAL,
+    RESULT,
+}
+
+data class RoundUiState(
+    val title: String,
+    val subtitle: String,
+    val countdownLabel: String,
+    val countdownText: String,
+    val countdownWarning: Boolean,
+    val oddsLabel: String,
+    val oddsValue: String,
+    val phase: RoundPhase,
+    val phaseLabel: String,
+    val selectionStatusText: String,
+    val selectionLocked: Boolean,
+    val selectionOptions: List<SelectionOptionUi>,
+    val selectedOutcomeId: String?,
+    val selectedOutcomeTitle: String,
+    val winningOutcomeTitle: String,
+    val didWin: Boolean,
+    val videoUrl: String,
+    val confirmTitle: String,
+    val revealTitle: String,
+    val revealSubtitle: String,
+    val revealStatusText: String,
+    val revealSelectionLabel: String,
+    val revealContinueTitle: String,
+    val resultTitle: String,
+    val resultSubtitle: String,
+    val resultSelectionLabel: String,
+    val resultOutcomeLabel: String,
+    val resultWinLabel: String,
+    val resultLoseLabel: String,
+    val resultNextRoundTitle: String,
+)
+
+class RoundViewModel(
+    private val repository: HermesRepository,
+    private val localizationStore: HermesLocalizationStore,
+    private val analyticsTracker: HermesAnalyticsTracker,
+    private val playerCoordinator: HermesPlayerCoordinator,
+) : ViewModel() {
+    private val roundFlow = repository.currentRound
+    private val localeFlow = localizationStore.localeCode
+    private val phaseFlow = MutableStateFlow(RoundPhase.PREVIEW)
+    private val selectedOutcomeIdFlow = MutableStateFlow<String?>(null)
+    private val nowFlow = flow {
+        while (true) {
+            emit(Clock.System.now())
+            delay(1_000)
+        }
+    }
+    private var transitionJob: Job? = null
+
+    val uiState: StateFlow<RoundUiState> = combine(
+        roundFlow,
+        localeFlow,
+        phaseFlow,
+        selectedOutcomeIdFlow,
+        nowFlow,
+    ) { round, localeCode, phase, selectedOutcomeId, now ->
+        buildUiState(
+            round = round,
+            localeCode = localeCode,
+            phase = phase,
+            selectedOutcomeId = selectedOutcomeId,
+            now = now,
+        )
+    }.stateIn(
+        scope = viewModelScope,
+        started = SharingStarted.Eagerly,
+        initialValue = buildUiState(
+            round = roundFlow.value,
+            localeCode = localeFlow.value,
+            phase = phaseFlow.value,
+            selectedOutcomeId = selectedOutcomeIdFlow.value,
+            now = Clock.System.now(),
+        ),
+    )
+
+    init {
+        startPreview(roundFlow.value)
+    }
+
+    fun onSelectOutcome(outcomeId: String) {
+        val round = roundFlow.value
+        if (phaseFlow.value != RoundPhase.PREVIEW) {
+            return
+        }
+
+        if (isTimerLocked(round, Clock.System.now())) {
+            return
+        }
+
+        selectedOutcomeIdFlow.value = outcomeId
+        analyticsTracker.track(
+            "outcome_focused",
+            attributes = mapOf("screen_name" to "round", "outcome_id" to outcomeId),
+        )
+        analyticsTracker.track(
+            "outcome_selected",
+            attributes = mapOf("screen_name" to "round", "outcome_id" to outcomeId),
+        )
+    }
+
+    fun onConfirmSelection() {
+        val round = roundFlow.value
+        val selectedOutcomeId = selectedOutcomeIdFlow.value ?: return
+        if (phaseFlow.value != RoundPhase.PREVIEW) {
+            return
+        }
+
+        if (isTimerLocked(round, Clock.System.now())) {
+            return
+        }
+
+        analyticsTracker.track(
+            "selection_submitted",
+            attributes = baseSelectionAttributes(selectedOutcomeId),
+        )
+        analyticsTracker.track(
+            "selection_accepted",
+            attributes = baseSelectionAttributes(selectedOutcomeId),
+        )
+        analyticsTracker.track(
+            "market_locked",
+            attributes = baseSelectionAttributes(selectedOutcomeId) + ("lock_reason" to "manual_selection"),
+        )
+
+        phaseFlow.value = RoundPhase.LOCKED
+        playerCoordinator.pause()
+
+        transitionJob?.cancel()
+        transitionJob = viewModelScope.launch {
+            delay(750)
+            if (phaseFlow.value == RoundPhase.LOCKED) {
+                phaseFlow.value = RoundPhase.REVEAL
+                analyticsTracker.track(
+                    "reveal_started",
+                    attributes = roundAnalyticsAttributes(round) + baseSelectionAttributes(selectedOutcomeId),
+                )
+            }
+        }
+    }
+
+    fun onRevealAcknowledged() {
+        val round = roundFlow.value
+        val selectedOutcomeId = selectedOutcomeIdFlow.value ?: return
+
+        analyticsTracker.track(
+            "reveal_completed",
+            attributes = roundAnalyticsAttributes(round) + baseSelectionAttributes(selectedOutcomeId),
+        )
+        phaseFlow.value = RoundPhase.RESULT
+        analyticsTracker.track(
+            "result_viewed",
+            attributes = roundAnalyticsAttributes(round) + baseSelectionAttributes(selectedOutcomeId) + mapOf(
+                "outcome" to resolveWinningOutcomeTitle(round, localeFlow.value),
+            ),
+        )
+    }
+
+    fun onNextRound() {
+        analyticsTracker.track(
+            "next_round_requested",
+            attributes = mapOf("screen_name" to "result"),
+        )
+
+        viewModelScope.launch {
+            transitionJob?.cancel()
+            val round = repository.refreshRoundFromNetwork()
+            startPreview(round)
+        }
+    }
+
+    private fun startPreview(round: StudyRound) {
+        phaseFlow.value = RoundPhase.PREVIEW
+        selectedOutcomeIdFlow.value = null
+        playerCoordinator.preparePreview(round.media.hlsMasterUrl)
+        playerCoordinator.player.seekTo(round.media.previewStartMs.toLong())
+
+        analyticsTracker.track("round_loaded", attributes = roundAnalyticsAttributes(round))
+        analyticsTracker.track("preview_started", attributes = roundAnalyticsAttributes(round))
+        analyticsTracker.track("screen_viewed", attributes = mapOf("screen_name" to "round"))
+    }
+
+    private fun buildUiState(
+        round: StudyRound,
+        localeCode: String,
+        phase: RoundPhase,
+        selectedOutcomeId: String?,
+        now: Instant,
+    ): RoundUiState {
+        val remainingMillis = round.event.lockAt.toEpochMilliseconds() - now.toEpochMilliseconds()
+        val isTimerLocked = remainingMillis <= 0
+        val countdownText = formatCountdown(remainingMillis)
+        val selectionLocked = phase != RoundPhase.PREVIEW || isTimerLocked
+        val options = selectionOptions(round, localeCode)
+        val selectedTitle = resolveSelectedOutcomeTitle(round, localeCode, selectedOutcomeId)
+        val winningTitle = resolveWinningOutcomeTitle(round, localeCode)
+
+        return RoundUiState(
+            title = localized(localeCode, R.string.round_title),
+            subtitle = localized(localeCode, R.string.round_subtitle),
+            countdownLabel = localized(localeCode, R.string.round_countdown_label),
+            countdownText = countdownText,
+            countdownWarning = phase == RoundPhase.PREVIEW && !isTimerLocked && remainingMillis <= 10_000,
+            oddsLabel = localized(localeCode, R.string.round_odds_label),
+            oddsValue = oddsSummary(round),
+            phase = phase,
+            phaseLabel = phaseLabel(localeCode, phase, isTimerLocked),
+            selectionStatusText = if (selectionLocked) localized(localeCode, R.string.round_locked_label) else localized(localeCode, R.string.round_selection_prompt),
+            selectionLocked = selectionLocked,
+            selectionOptions = options,
+            selectedOutcomeId = selectedOutcomeId,
+            selectedOutcomeTitle = selectedTitle,
+            winningOutcomeTitle = winningTitle,
+            didWin = selectedOutcomeId == round.settlement.winningOutcomeId,
+            videoUrl = round.media.hlsMasterUrl,
+            confirmTitle = localized(localeCode, R.string.round_primary_cta),
+            revealTitle = localized(localeCode, R.string.reveal_title),
+            revealSubtitle = localized(localeCode, R.string.reveal_subtitle),
+            revealStatusText = localized(localeCode, R.string.reveal_status),
+            revealSelectionLabel = localized(localeCode, R.string.result_selection_label),
+            revealContinueTitle = localized(localeCode, R.string.reveal_cta),
+            resultTitle = localized(localeCode, R.string.result_title),
+            resultSubtitle = localized(localeCode, R.string.result_subtitle),
+            resultSelectionLabel = localized(localeCode, R.string.result_selection_label),
+            resultOutcomeLabel = localized(localeCode, R.string.result_outcome_label),
+            resultWinLabel = localized(localeCode, R.string.result_win),
+            resultLoseLabel = localized(localeCode, R.string.result_lose),
+            resultNextRoundTitle = localized(localeCode, R.string.result_next_round),
+        )
+    }
+
+    private fun localized(localeCode: String, resId: Int): String {
+        return localizationStore.string(localeCode, resId)
+    }
+
+    private fun selectionOptions(round: StudyRound, localeCode: String): List<SelectionOptionUi> {
+        val oddsByOutcomeId = round.oddsVersion.odds.associateBy { it.outcomeId }
+
+        return round.market.outcomes
+            .sortedBy { it.sortOrder }
+            .map { outcome ->
+                SelectionOptionUi(
+                    id = outcome.id,
+                    title = outcomeTitle(localeCode, outcome),
+                    subtitle = localized(localeCode, R.string.round_selection_prompt),
+                    odds = oddsByOutcomeId[outcome.id]?.decimalOdds?.let { formatOdds(it) } ?: "--",
+                )
+            }
+    }
+
+    private fun outcomeTitle(localeCode: String, outcome: HermesOutcome): String {
+        return when (outcome.labelKey) {
+            "round.home" -> localized(localeCode, R.string.round_home)
+            "round.away" -> localized(localeCode, R.string.round_away)
+            else -> outcome.outcomeCode.replaceFirstChar { char -> char.uppercaseChar().toString() }
+        }
+    }
+
+    private fun resolveSelectedOutcomeTitle(round: StudyRound, localeCode: String, selectedOutcomeId: String?): String {
+        if (selectedOutcomeId == null) {
+            return localized(localeCode, R.string.round_selection_prompt)
+        }
+
+        return round.market.outcomes.firstOrNull { it.id == selectedOutcomeId }?.let { outcomeTitle(localeCode, it) }
+            ?: localized(localeCode, R.string.round_selection_prompt)
+    }
+
+    private fun resolveWinningOutcomeTitle(round: StudyRound, localeCode: String): String {
+        return round.market.outcomes.firstOrNull { it.id == round.settlement.winningOutcomeId }?.let { outcomeTitle(localeCode, it) }
+            ?: localized(localeCode, R.string.round_selection_prompt)
+    }
+
+    private fun oddsSummary(round: StudyRound): String {
+        val oddsByOutcomeId = round.oddsVersion.odds.associateBy { it.outcomeId }
+        return round.market.outcomes
+            .sortedBy { it.sortOrder }
+            .mapNotNull { outcome ->
+                oddsByOutcomeId[outcome.id]?.decimalOdds?.let { formatOdds(it) }
+            }
+            .joinToString(" / ")
+    }
+
+    private fun formatOdds(value: Double): String {
+        return String.format(Locale.US, "%.2f", value)
+    }
+
+    private fun formatCountdown(remainingMillis: Long): String {
+        val totalSeconds = (remainingMillis.coerceAtLeast(0) / 1_000).toInt()
+        val minutes = totalSeconds / 60
+        val seconds = totalSeconds % 60
+        return String.format(Locale.US, "%02d:%02d", minutes, seconds)
+    }
+
+    private fun phaseLabel(localeCode: String, phase: RoundPhase, isTimerLocked: Boolean): String {
+        return when (phase) {
+            RoundPhase.PREVIEW -> if (isTimerLocked) localized(localeCode, R.string.round_locked_label) else localized(localeCode, R.string.round_preview_label)
+            RoundPhase.LOCKED -> localized(localeCode, R.string.round_locked_label)
+            RoundPhase.REVEAL -> localized(localeCode, R.string.reveal_title)
+            RoundPhase.RESULT -> localized(localeCode, R.string.result_title)
+        }
+    }
+
+    private fun isTimerLocked(round: StudyRound, now: Instant): Boolean {
+        return now.toEpochMilliseconds() >= round.event.lockAt.toEpochMilliseconds()
+    }
+
+    private fun baseSelectionAttributes(outcomeId: String): Map<String, String> {
+        return mapOf("screen_name" to "round", "outcome_id" to outcomeId)
+    }
+
+    private fun roundAnalyticsAttributes(round: StudyRound): Map<String, String> {
+        return mapOf(
+            "screen_name" to "round",
+            "event_id" to round.event.id,
+            "market_id" to round.market.id,
+        )
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/selection/SelectionPanel.kt

@@ -0,0 +1,131 @@
+package com.hermes.study.feature.selection
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.TouchApp
+import androidx.compose.material.icons.outlined.RadioButtonUnchecked
+import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.hermes.study.core.designsystem.HermesColors
+import com.hermes.study.core.designsystem.HermesPrimaryButton
+
+data class SelectionOptionUi(
+    val id: String,
+    val title: String,
+    val subtitle: String,
+    val odds: String,
+)
+
+@Composable
+fun SelectionPanel(
+    statusText: String,
+    options: List<SelectionOptionUi>,
+    selectedOptionId: String?,
+    isLocked: Boolean,
+    confirmTitle: String,
+    onSelect: (SelectionOptionUi) -> Unit,
+    onConfirm: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(modifier = modifier, verticalArrangement = Arrangement.spacedBy(12.dp)) {
+        val statusColor = if (isLocked) HermesColors.warning else HermesColors.accent
+        Row(
+            modifier = Modifier
+                .clip(RoundedCornerShape(999.dp))
+                .background(statusColor.copy(alpha = 0.16f))
+                .padding(horizontal = 12.dp, vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Icon(
+                imageVector = if (isLocked) Icons.Filled.Lock else Icons.Filled.TouchApp,
+                contentDescription = null,
+                tint = statusColor,
+            )
+            Text(
+                text = statusText,
+                color = statusColor,
+                style = MaterialTheme.typography.labelMedium,
+                fontWeight = FontWeight.SemiBold,
+            )
+        }
+
+        Column(verticalArrangement = Arrangement.spacedBy(10.dp)) {
+            options.forEach { option ->
+                SelectionOptionButton(
+                    option = option,
+                    selected = selectedOptionId == option.id,
+                    isLocked = isLocked,
+                    onClick = { onSelect(option) },
+                )
+            }
+        }
+
+        HermesPrimaryButton(
+            text = confirmTitle,
+            onClick = onConfirm,
+            enabled = !isLocked && selectedOptionId != null,
+        )
+    }
+}
+
+@Composable
+private fun SelectionOptionButton(
+    option: SelectionOptionUi,
+    selected: Boolean,
+    isLocked: Boolean,
+    onClick: () -> Unit,
+) {
+    val containerColor = if (selected) HermesColors.accent else HermesColors.surfaceElevated
+    val contentColor = if (selected) HermesColors.background else HermesColors.textPrimary
+    val subtitleColor = if (selected) HermesColors.background.copy(alpha = 0.7f) else HermesColors.textSecondary
+
+    Button(
+        onClick = onClick,
+        enabled = !isLocked,
+        modifier = Modifier.fillMaxWidth(),
+        shape = RoundedCornerShape(18.dp),
+        colors = ButtonDefaults.buttonColors(
+            containerColor = containerColor,
+            contentColor = contentColor,
+            disabledContainerColor = HermesColors.surfaceElevated.copy(alpha = 0.65f),
+            disabledContentColor = HermesColors.textTertiary,
+        ),
+    ) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Column(modifier = Modifier.fillMaxWidth(0.72f), verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                Text(text = option.title, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold)
+                Text(text = option.subtitle, style = MaterialTheme.typography.bodySmall, color = subtitleColor)
+            }
+
+            Column(horizontalAlignment = Alignment.End, verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                Text(text = option.odds, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold)
+                Icon(
+                    imageVector = if (selected) Icons.Filled.CheckCircle else Icons.Outlined.RadioButtonUnchecked,
+                    contentDescription = null,
+                    tint = contentColor,
+                )
+            }
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/session/SessionView.kt

@@ -0,0 +1,36 @@
+package com.hermes.study.feature.session
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.hermes.study.R
+import com.hermes.study.core.designsystem.HermesCard
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import com.hermes.study.core.designsystem.HermesColors
+import com.hermes.study.core.designsystem.HermesSectionHeader
+import com.hermes.study.core.localization.HermesLocalizationStore
+
+@Composable
+fun SessionView(
+    localizationStore: HermesLocalizationStore,
+    localeCode: String,
+    modifier: Modifier = Modifier,
+) {
+    HermesCard(modifier = modifier) {
+        Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+            HermesSectionHeader(
+                title = localizationStore.string(localeCode, R.string.session_title),
+                subtitle = localizationStore.string(localeCode, R.string.session_subtitle),
+            )
+
+            Text(
+                text = localizationStore.string(localeCode, R.string.session_note),
+                style = MaterialTheme.typography.bodyMedium,
+                color = HermesColors.textSecondary,
+            )
+        }
+    }
+}

mobile/android-app/app/src/main/java/com/hermes/study/feature/settings/SettingsView.kt

@@ -0,0 +1,62 @@
+package com.hermes.study.feature.settings
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.hermes.study.R
+import com.hermes.study.core.designsystem.HermesCard
+import com.hermes.study.core.designsystem.HermesColors
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import com.hermes.study.core.localization.HermesLocalizationStore
+import com.hermes.study.core.designsystem.HermesSectionHeader
+import java.util.Locale
+
+@Composable
+fun SettingsView(
+    localizationStore: HermesLocalizationStore,
+    localeCode: String,
+    modifier: Modifier = Modifier,
+) {
+    HermesCard(modifier = modifier) {
+        Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+            HermesSectionHeader(
+                title = localizationStore.string(localeCode, R.string.settings_title),
+                subtitle = localizationStore.string(localeCode, R.string.settings_subtitle),
+            )
+
+            SettingRow(
+                label = localizationStore.string(localeCode, R.string.settings_language),
+                value = localeCode.uppercase(Locale.US),
+            )
+            SettingRow(
+                label = localizationStore.string(localeCode, R.string.settings_haptics),
+                value = localizationStore.string(localeCode, R.string.settings_enabled),
+            )
+            SettingRow(
+                label = localizationStore.string(localeCode, R.string.settings_analytics),
+                value = localizationStore.string(localeCode, R.string.settings_enabled),
+            )
+        }
+    }
+}
+
+@Composable
+private fun SettingRow(
+    label: String,
+    value: String,
+) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.SpaceBetween,
+    ) {
+        Text(text = label, style = MaterialTheme.typography.bodyLarge, color = HermesColors.textPrimary)
+        Text(text = value, style = MaterialTheme.typography.bodyMedium, color = HermesColors.textSecondary)
+    }
+}

mobile/android-app/app/src/main/res/values-night/themes.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Hermes" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="android:statusBarColor">@android:color/black</item>
+        <item name="android:navigationBarColor">@android:color/black</item>
+    </style>
+</resources>

mobile/android-app/app/src/main/res/values-sv/strings.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Hermes</string>
+    <string name="app_subtitle">Native prototyp för studien</string>
+    <string name="common_continue">Fortsätt</string>
+    <string name="common_cancel">Avbryt</string>
+    <string name="common_close">Stäng</string>
+    <string name="common_retry">Försök igen</string>
+    <string name="common_loading">Laddar</string>
+    <string name="errors_generic">Försök igen.</string>
+    <string name="errors_network">Nätverksfel. Kontrollera anslutningen.</string>
+    <string name="errors_playback">Videouppspelningen misslyckades.</string>
+    <string name="errors_session_expired">Sessionen har gått ut. Starta igen.</string>
+    <string name="onboarding_title">Studieintro</string>
+    <string name="onboarding_subtitle">Titta på klippet, välj före låsning och se sedan avslöjandet.</string>
+    <string name="onboarding_consent_body">Den här prototypen är för forskning och använder inga riktiga pengar.</string>
+    <string name="onboarding_consent_note">Du kan byta språk när som helst.</string>
+    <string name="onboarding_start_session">Starta session</string>
+    <string name="feed_title">Förhandsflöde</string>
+    <string name="feed_subtitle">Nästa runda är redo att granskas.</string>
+    <string name="feed_hero_title">Möjlighet till segermål</string>
+    <string name="feed_hero_subtitle">En kort förhandsvisning leder till ett tydligt val.</string>
+    <string name="feed_lock_label">Låses om</string>
+    <string name="feed_odds_label">Liveodds</string>
+    <string name="feed_cta">Titta på förhandsklipp</string>
+    <string name="round_title">Aktiv runda</string>
+    <string name="round_subtitle">Gör ditt val före låsning och vänta sedan på avslöjandet.</string>
+    <string name="round_video_placeholder">Videoförhandsvisning</string>
+    <string name="round_preview_label">Förhandsvisning spelas</string>
+    <string name="round_countdown_label">Låsning om</string>
+    <string name="round_odds_label">Odds</string>
+    <string name="round_selection_prompt">Välj ett utfall.</string>
+    <string name="round_primary_cta">Bekräfta valet</string>
+    <string name="round_locked_label">Låst</string>
+    <string name="round_home">Hemma</string>
+    <string name="round_away">Borta</string>
+    <string name="reveal_title">Avslöjande</string>
+    <string name="reveal_subtitle">Klippet visar nu utfallet.</string>
+    <string name="reveal_status">Avslöjningssegmentet spelas upp.</string>
+    <string name="reveal_cta">Se resultat</string>
+    <string name="result_title">Resultat</string>
+    <string name="result_subtitle">Ditt val jämfört med det faktiska utfallet.</string>
+    <string name="result_selection_label">Ditt val</string>
+    <string name="result_outcome_label">Utfall</string>
+    <string name="result_win">Vinnande val</string>
+    <string name="result_lose">Inte denna gång</string>
+    <string name="result_next_round">Nästa runda</string>
+    <string name="settings_title">Inställningar</string>
+    <string name="settings_subtitle">Språk-, haptik- och analysinställningar.</string>
+    <string name="settings_language">Språk</string>
+    <string name="settings_enabled">Aktiverad</string>
+    <string name="settings_haptics">Haptik</string>
+    <string name="settings_analytics">Analys</string>
+    <string name="session_title">Session</string>
+    <string name="session_subtitle">Sessionssynk och livscykelkontroller.</string>
+    <string name="session_note">Sessionsstatus visas här när backend-sessionen har startat.</string>
+</resources>

mobile/android-app/app/src/main/res/values/colors.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="hermes_background">#0A0D14</color>
+    <color name="hermes_surface">#171B24</color>
+    <color name="hermes_surface_elevated">#222838</color>
+    <color name="hermes_accent">#DFBF5B</color>
+    <color name="hermes_positive">#56C28F</color>
+    <color name="hermes_warning">#F0B14C</color>
+    <color name="hermes_text_primary">#FFFFFF</color>
+    <color name="hermes_text_secondary">#B9C0D0</color>
+</resources>

mobile/android-app/app/src/main/res/values/strings.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Hermes</string>
+    <string name="app_subtitle">Native study app prototype</string>
+    <string name="common_continue">Continue</string>
+    <string name="common_cancel">Cancel</string>
+    <string name="common_close">Close</string>
+    <string name="common_retry">Retry</string>
+    <string name="common_loading">Loading</string>
+    <string name="errors_generic">Please try again.</string>
+    <string name="errors_network">Network error. Check your connection.</string>
+    <string name="errors_playback">Video playback failed.</string>
+    <string name="errors_session_expired">Session expired. Please start again.</string>
+    <string name="onboarding_title">Study intro</string>
+    <string name="onboarding_subtitle">Watch the clip, decide before lock, then see the reveal.</string>
+    <string name="onboarding_consent_body">This prototype is for research and does not use real money.</string>
+    <string name="onboarding_consent_note">You can switch languages at any time.</string>
+    <string name="onboarding_start_session">Start session</string>
+    <string name="feed_title">Preview feed</string>
+    <string name="feed_subtitle">The next round is ready for review.</string>
+    <string name="feed_hero_title">Late winner chance</string>
+    <string name="feed_hero_subtitle">A short preview leads into a single, clear choice.</string>
+    <string name="feed_lock_label">Locks in</string>
+    <string name="feed_odds_label">Live odds</string>
+    <string name="feed_cta">Watch preview</string>
+    <string name="round_title">Active round</string>
+    <string name="round_subtitle">Make your choice before lock, then wait for the reveal.</string>
+    <string name="round_video_placeholder">Video preview</string>
+    <string name="round_preview_label">Preview playing</string>
+    <string name="round_countdown_label">Lock in</string>
+    <string name="round_odds_label">Odds</string>
+    <string name="round_selection_prompt">Choose an outcome.</string>
+    <string name="round_primary_cta">Confirm selection</string>
+    <string name="round_locked_label">Locked</string>
+    <string name="round_home">Home</string>
+    <string name="round_away">Away</string>
+    <string name="reveal_title">Reveal</string>
+    <string name="reveal_subtitle">The clip is now showing the outcome.</string>
+    <string name="reveal_status">Reveal segment is playing.</string>
+    <string name="reveal_cta">See result</string>
+    <string name="result_title">Result</string>
+    <string name="result_subtitle">Your selection versus the actual outcome.</string>
+    <string name="result_selection_label">Your selection</string>
+    <string name="result_outcome_label">Outcome</string>
+    <string name="result_win">Winning selection</string>
+    <string name="result_lose">Not this time</string>
+    <string name="result_next_round">Next round</string>
+    <string name="settings_title">Settings</string>
+    <string name="settings_subtitle">Language, haptics and analytics preferences.</string>
+    <string name="settings_language">Language</string>
+    <string name="settings_enabled">Enabled</string>
+    <string name="settings_haptics">Haptics</string>
+    <string name="settings_analytics">Analytics</string>
+    <string name="session_title">Session</string>
+    <string name="session_subtitle">Session sync and lifecycle controls.</string>
+    <string name="session_note">Session state will appear here once the backend session is started.</string>
+</resources>

mobile/android-app/app/src/main/res/values/themes.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Hermes" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="android:statusBarColor">@android:color/black</item>
+        <item name="android:navigationBarColor">@android:color/black</item>
+    </style>
+</resources>

mobile/android-app/build.gradle.kts

@@ -0,0 +1,6 @@
+plugins {
+    id("com.android.application") version "8.5.2" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21" apply false
+}

mobile/android-app/gradle.properties

@@ -0,0 +1,5 @@
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+android.suppressUnsupportedCompileSdk=35
+kotlin.code.style=official
+org.gradle.jvmargs=-Xmx4g -Dfile.encoding=UTF-8

mobile/android-app/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

mobile/android-app/gradlew

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+APP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROPERTIES_FILE="$APP_DIR/gradle/wrapper/gradle-wrapper.properties"
+GRADLE_USER_HOME="${GRADLE_USER_HOME:-$HOME/.gradle}"
+
+if [[ ! -f "$PROPERTIES_FILE" ]]; then
+  echo "Missing $PROPERTIES_FILE" >&2
+  exit 1
+fi
+
+distribution_url=""
+while IFS='=' read -r key value; do
+  case "$key" in
+    distributionUrl)
+      distribution_url="${value//\\:/:}"
+      ;;
+  esac
+done < "$PROPERTIES_FILE"
+
+if [[ -z "$distribution_url" ]]; then
+  echo "Unable to read distributionUrl from $PROPERTIES_FILE" >&2
+  exit 1
+fi
+
+gradle_version="${distribution_url##*/gradle-}"
+gradle_version="${gradle_version%-bin.zip}"
+gradle_version="${gradle_version%-all.zip}"
+
+dists_dir="$GRADLE_USER_HOME/wrapper/dists/gradle-${gradle_version}-bin"
+
+shopt -s nullglob
+for candidate in "$dists_dir"/*/gradle-"$gradle_version"; do
+  if [[ -x "$candidate/bin/gradle" ]]; then
+    exec "$candidate/bin/gradle" "$@"
+  fi
+done
+
+download_dir="$dists_dir/manual/gradle-$gradle_version"
+if [[ ! -x "$download_dir/bin/gradle" ]]; then
+  mkdir -p "$dists_dir/manual"
+  tmp_zip="$(mktemp)"
+  cleanup() { rm -f "$tmp_zip"; }
+  trap cleanup EXIT
+
+  if command -v curl >/dev/null 2>&1; then
+    curl -fsSL "$distribution_url" -o "$tmp_zip"
+  elif command -v wget >/dev/null 2>&1; then
+    wget -qO "$tmp_zip" "$distribution_url"
+  else
+    echo "curl or wget is required to download Gradle" >&2
+    exit 1
+  fi
+
+  unzip -q "$tmp_zip" -d "$dists_dir/manual"
+fi
+
+exec "$download_dir/bin/gradle" "$@"

mobile/android-app/settings.gradle.kts

@@ -0,0 +1,18 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "hermes-android"
+include(":app")