Auto-commit after successful build: update app gameplay/UI, improve build setup

Changed files:\napp/build.gradle.kts
app/src/main/java/com/kawomi/githugandroid/Exercise.kt
app/src/main/java/com/kawomi/githugandroid/GitHugApp.kt
app/src/main/java/com/kawomi/githugandroid/Header.kt
app/src/main/java/com/kawomi/githugandroid/Levels.kt
app/src/main/java/com/kawomi/githugandroid/Panes.kt
app/src/main/java/com/kawomi/githugandroid/Terminal.kt
app/src/main/java/com/kawomi/githugandroid/Visual.kt

app/src/main/java/com/kawomi/githugandroid/Exercise.kt

@@ -0,0 +1,68 @@
+package com.kawomi.githugandroid
+
+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.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun ExercisePane(
+    level: Level,
+    visibleHint: String?,
+    suggestionsExpanded: Boolean,
+    onToggleSuggestions: () -> Unit,
+    onHint: () -> Unit,
+    onReset: () -> Unit,
+) {
+    Column(
+        modifier = Modifier.fillMaxWidth(),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        Text(level.title, style = MaterialTheme.typography.titleLarge, color = TextPrimary)
+        Text(level.description, color = TextSecondary)
+        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+            Button(
+                onClick = onHint,
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = Accent,
+                    contentColor = Color.Black,
+                ),
+            ) {
+                Text("Hint")
+            }
+            TextButton(
+                onClick = onToggleSuggestions,
+                colors = ButtonDefaults.textButtonColors(contentColor = Accent),
+            ) {
+                Text("Suggestions")
+            }
+            TextButton(
+                onClick = onReset,
+                colors = ButtonDefaults.textButtonColors(contentColor = Accent),
+            ) {
+                Text("Reset level")
+            }
+        }
+        if (suggestionsExpanded && level.commandSuggestions.isNotEmpty()) {
+            Text("Suggestions", color = TextPrimary, fontWeight = FontWeight.Bold)
+            level.commandSuggestions.forEach { suggestion ->
+                Text(suggestion, color = TextSecondary, fontFamily = FontFamily.Monospace)
+            }
+        }
+        if (visibleHint != null) {
+            Text("Hint", color = TextPrimary, fontWeight = FontWeight.Bold)
+            Text(visibleHint, color = TextSecondary)
+        }
+    }
+}

app/src/main/java/com/kawomi/githugandroid/GitHugApp.kt

@@ -1,78 +1,33 @@
 package com.kawomi.githugandroid
 
-import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
-import androidx.compose.foundation.gestures.Orientation
-import androidx.compose.foundation.gestures.draggable
-import androidx.compose.foundation.gestures.rememberDraggableState
-import androidx.compose.foundation.horizontalScroll
-import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.text.BasicTextField
-import androidx.compose.foundation.text.KeyboardActions
-import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.foundation.verticalScroll
-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.Scaffold
 import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.focus.FocusRequester
-import androidx.compose.ui.focus.focusRequester
-import androidx.compose.ui.focus.onFocusChanged
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.platform.LocalFocusManager
-import androidx.compose.ui.platform.LocalSoftwareKeyboardController
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.text.TextRange
-import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.text.font.FontFamily
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.input.ImeAction
-import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.input.TextFieldValue
-import androidx.compose.ui.unit.sp
+import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.unit.dp
-import androidx.compose.foundation.relocation.BringIntoViewRequester
-import androidx.compose.foundation.relocation.bringIntoViewRequester
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 
 @Composable
@@ -393,660 +348,3 @@ fun GitHugApp() {
     }
 }
 
-@Composable
-private fun FixedHeader() {
-    Card(
-        colors = CardDefaults.cardColors(containerColor = PanelPrimary),
-        shape = RoundedCornerShape(14.dp),
-    ) {
-        Row(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(horizontal = 12.dp, vertical = 10.dp),
-            verticalAlignment = Alignment.CenterVertically,
-            horizontalArrangement = Arrangement.spacedBy(10.dp),
-        ) {
-            Image(
-                painter = painterResource(id = R.drawable.githug_android_logo),
-                contentDescription = "GitHug Android logo",
-                modifier = Modifier.size(28.dp),
-            )
-            Text("GitHug Android", style = MaterialTheme.typography.titleLarge, color = TextPrimary)
-        }
-    }
-}
-
-@Composable
-private fun PaneWorkspace(
-    modifier: Modifier = Modifier,
-    paneLayout: PaneLayout,
-    onMovePane: (PaneId, Int) -> Unit,
-    onTogglePane: (PaneId) -> Unit,
-    onResize: (PaneId, PaneId, Float) -> Unit,
-    onResizeFinished: () -> Unit,
-    levelsContent: @Composable () -> Unit,
-    visualContent: @Composable () -> Unit,
-    exerciseContent: @Composable () -> Unit,
-    terminalContent: @Composable () -> Unit,
-) {
-    BoxWithConstraints(modifier = modifier) {
-        val heightBasis = maxHeight.value.takeIf { it > 0f } ?: 1f
-
-        Column(
-            modifier = Modifier.fillMaxSize(),
-            verticalArrangement = Arrangement.spacedBy(0.dp),
-        ) {
-            paneLayout.order.forEachIndexed { index, paneId ->
-                val isCollapsed = paneId in paneLayout.collapsed
-                if (isCollapsed) {
-                    CollapsedPaneCard(
-                        paneId = paneId,
-                        canMoveUp = index > 0,
-                        canMoveDown = index < paneLayout.order.lastIndex,
-                        onMoveUp = { onMovePane(paneId, -1) },
-                        onMoveDown = { onMovePane(paneId, 1) },
-                        onToggleCollapse = { onTogglePane(paneId) },
-                    )
-                } else {
-                    PaneCard(
-                        paneId = paneId,
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .weight((paneLayout.weights[paneId] ?: 1f).coerceAtLeast(0.6f)),
-                        canMoveUp = index > 0,
-                        canMoveDown = index < paneLayout.order.lastIndex,
-                        onMoveUp = { onMovePane(paneId, -1) },
-                        onMoveDown = { onMovePane(paneId, 1) },
-                        onToggleCollapse = { onTogglePane(paneId) },
-                    ) {
-                        when (paneId) {
-                            PaneId.LEVELS -> levelsContent()
-                            PaneId.VISUAL -> visualContent()
-                            PaneId.EXERCISE -> exerciseContent()
-                            PaneId.TERMINAL -> terminalContent()
-                        }
-                    }
-                }
-
-                if (index < paneLayout.order.lastIndex) {
-                    val upper = paneId
-                    val lower = paneLayout.order[index + 1]
-                    PaneDivider(
-                        enabled = upper !in paneLayout.collapsed && lower !in paneLayout.collapsed,
-                        onDrag = { deltaPx ->
-                            val fraction = deltaPx / heightBasis
-                            onResize(upper, lower, fraction)
-                        },
-                        onDragFinished = onResizeFinished,
-                    )
-                }
-            }
-        }
-    }
-}
-
-@Composable
-private fun PaneCard(
-    paneId: PaneId,
-    modifier: Modifier = Modifier,
-    canMoveUp: Boolean,
-    canMoveDown: Boolean,
-    onMoveUp: () -> Unit,
-    onMoveDown: () -> Unit,
-    onToggleCollapse: () -> Unit,
-    content: @Composable () -> Unit,
-) {
-    Card(
-        modifier = modifier,
-        colors = CardDefaults.cardColors(containerColor = PanelSecondary),
-        shape = RoundedCornerShape(16.dp),
-    ) {
-        Column(modifier = Modifier.fillMaxSize()) {
-            PaneHeader(
-                paneId = paneId,
-                collapsed = false,
-                canMoveUp = canMoveUp,
-                canMoveDown = canMoveDown,
-                onMoveUp = onMoveUp,
-                onMoveDown = onMoveDown,
-                onToggleCollapse = onToggleCollapse,
-            )
-            Box(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .padding(horizontal = 12.dp, vertical = 10.dp),
-            ) {
-                content()
-            }
-        }
-    }
-}
-
-@Composable
-private fun CollapsedPaneCard(
-    paneId: PaneId,
-    canMoveUp: Boolean,
-    canMoveDown: Boolean,
-    onMoveUp: () -> Unit,
-    onMoveDown: () -> Unit,
-    onToggleCollapse: () -> Unit,
-) {
-    Card(
-        modifier = Modifier.fillMaxWidth(),
-        colors = CardDefaults.cardColors(containerColor = PanelSecondary),
-        shape = RoundedCornerShape(16.dp),
-    ) {
-        PaneHeader(
-            paneId = paneId,
-            collapsed = true,
-            canMoveUp = canMoveUp,
-            canMoveDown = canMoveDown,
-            onMoveUp = onMoveUp,
-            onMoveDown = onMoveDown,
-            onToggleCollapse = onToggleCollapse,
-        )
-    }
-}
-
-@Composable
-private fun PaneHeader(
-    paneId: PaneId,
-    collapsed: Boolean,
-    canMoveUp: Boolean,
-    canMoveDown: Boolean,
-    onMoveUp: () -> Unit,
-    onMoveDown: () -> Unit,
-    onToggleCollapse: () -> Unit,
-) {
-    Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .background(if (collapsed) PanelTertiary else PanelPrimary)
-            .padding(horizontal = 10.dp, vertical = 6.dp),
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.SpaceBetween,
-    ) {
-        Text(paneId.title, color = TextPrimary, fontWeight = FontWeight.Bold)
-        Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
-            HeaderActionButton(label = if (collapsed) "Expand" else "Collapse", onClick = onToggleCollapse)
-            HeaderActionButton(label = "↑", enabled = canMoveUp, onClick = onMoveUp)
-            HeaderActionButton(label = "↓", enabled = canMoveDown, onClick = onMoveDown)
-        }
-    }
-}
-
-@Composable
-private fun HeaderActionButton(
-    label: String,
-    enabled: Boolean = true,
-    onClick: () -> Unit,
-) {
-    TextButton(
-        onClick = onClick,
-        enabled = enabled,
-        contentPadding = PaddingValues(horizontal = 6.dp, vertical = 0.dp),
-        colors = ButtonDefaults.textButtonColors(
-            contentColor = Accent,
-            disabledContentColor = TextMuted,
-        ),
-    ) {
-        Text(label, fontSize = 11.sp)
-    }
-}
-
-@Composable
-private fun PaneDivider(
-    enabled: Boolean,
-    onDrag: (Float) -> Unit,
-    onDragFinished: () -> Unit,
-) {
-    val dragState = rememberDraggableState { delta ->
-        if (enabled) onDrag(delta)
-    }
-
-    Box(
-        modifier = Modifier
-            .fillMaxWidth()
-            .height(18.dp)
-            .draggable(
-                state = dragState,
-                orientation = Orientation.Vertical,
-                enabled = enabled,
-                onDragStopped = { onDragFinished() },
-            ),
-        contentAlignment = Alignment.CenterStart,
-    ) {
-        Box(
-            modifier = Modifier
-                .fillMaxWidth()
-                .height(1.dp)
-                .background(if (enabled) Accent.copy(alpha = 0.45f) else PanelTertiary),
-        )
-        Card(
-            colors = CardDefaults.cardColors(
-                containerColor = if (enabled) PanelPrimary else PanelTertiary,
-            ),
-            shape = RoundedCornerShape(999.dp),
-            modifier = Modifier.padding(start = 28.dp),
-        ) {
-            Text(
-                text = "↕",
-                color = if (enabled) Accent else TextMuted,
-                modifier = Modifier.padding(horizontal = 8.dp, vertical = 1.dp),
-                fontSize = 13.sp,
-                fontWeight = FontWeight.ExtraBold,
-            )
-        }
-    }
-}
-
-@OptIn(ExperimentalFoundationApi::class)
-@Composable
-private fun RowScope.TerminalInputField(
-    inputFieldVersion: Int,
-    commandInput: TextFieldValue,
-    onValueChange: (TextFieldValue) -> Unit,
-    focusRequester: FocusRequester,
-    bringIntoViewRequester: BringIntoViewRequester,
-    keyboardController: androidx.compose.ui.platform.SoftwareKeyboardController?,
-    onSubmit: () -> Unit,
-) {
-    val scope = rememberCoroutineScope()
-
-    key(inputFieldVersion) {
-        BasicTextField(
-            value = commandInput,
-            onValueChange = onValueChange,
-            modifier = Modifier
-                .weight(1f)
-                .focusRequester(focusRequester)
-                .bringIntoViewRequester(bringIntoViewRequester)
-                .onFocusChanged { state ->
-                    if (state.isFocused) {
-                        keyboardController?.show()
-                        scope.launch {
-                            delay(150)
-                            bringIntoViewRequester.bringIntoView()
-                        }
-                    }
-                },
-            singleLine = true,
-            textStyle = TextStyle(
-                color = TextPrimary,
-                fontFamily = FontFamily.Monospace,
-                fontSize = 15.sp,
-                fontWeight = FontWeight.Normal,
-            ),
-            cursorBrush = SolidColor(Accent),
-            keyboardOptions = KeyboardOptions(
-                autoCorrect = false,
-                keyboardType = KeyboardType.Ascii,
-                imeAction = ImeAction.Done,
-            ),
-            keyboardActions = KeyboardActions(onDone = { onSubmit() }),
-            decorationBox = { innerTextField ->
-                Box(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .background(Color.Transparent)
-                        .padding(vertical = 2.dp),
-                    contentAlignment = Alignment.CenterStart,
-                ) {
-                    if (commandInput.text.isEmpty()) {
-                        Text(
-                            text = "Enter git command",
-                            color = TextMuted.copy(alpha = 0.7f),
-                            fontFamily = FontFamily.Monospace,
-                            fontSize = 15.sp,
-                        )
-                    }
-                    innerTextField()
-                }
-            },
-        )
-    }
-}
-
-@Composable
-private fun LevelsPane(
-    levels: List<Level>,
-    currentLevelIndex: Int,
-    completedLevels: Set<String>,
-    onSelect: (Int) -> Unit,
-) {
-    Column(
-        modifier = Modifier.fillMaxWidth(),
-        verticalArrangement = Arrangement.spacedBy(6.dp),
-    ) {
-        levels.forEachIndexed { index, level ->
-            Card(
-                colors = CardDefaults.cardColors(
-                    containerColor = if (index == currentLevelIndex) PanelTertiary else PanelPrimary,
-                ),
-                shape = RoundedCornerShape(10.dp),
-            ) {
-                TextButton(
-                    onClick = { onSelect(index) },
-                    modifier = Modifier.fillMaxWidth(),
-                    colors = ButtonDefaults.textButtonColors(
-                        contentColor = if (index == currentLevelIndex) Accent else TextSecondary,
-                    ),
-                ) {
-                    Text(
-                        text = buildString {
-                            append(if (level.id in completedLevels) "✓ " else "• ")
-                            append(level.title)
-                        },
-                        modifier = Modifier.fillMaxWidth(),
-                    )
-                }
-            }
-        }
-    }
-}
-
-@Composable
-private fun VisualPane(repo: RepoState) {
-    val configuration = LocalConfiguration.current
-    val isWide = configuration.screenWidthDp >= 840
-
-    if (isWide) {
-        Row(
-            modifier = Modifier.fillMaxSize(),
-            horizontalArrangement = Arrangement.spacedBy(12.dp),
-        ) {
-            InfoPaneCard(
-                title = "Workspace",
-                content = repo.files.joinToString("\n") {
-                    "${if (it.staged) "[staged]" else "[file]  "} ${it.name}"
-                }.ifBlank { "(empty)" },
-                modifier = Modifier.weight(1f),
-            )
-            InfoPaneCard(
-                title = "Branches",
-                content = buildString {
-                    appendLine("HEAD -> ${repo.headBranch}")
-                    repo.branches.forEach { (name, _) -> appendLine(name) }
-                }.trim(),
-                modifier = Modifier.weight(1f),
-            )
-            InfoPaneCard(
-                title = "Commits",
-                content = repo.commits.reversed().joinToString("\n") { "${it.id} ${it.message}" }.ifBlank { "No commits yet" },
-                modifier = Modifier.weight(1f),
-            )
-        }
-    } else {
-        Column(
-            modifier = Modifier
-                .fillMaxWidth(),
-            verticalArrangement = Arrangement.spacedBy(10.dp),
-        ) {
-            InfoPaneCard(
-                title = "Workspace",
-                content = repo.files.joinToString("\n") {
-                    "${if (it.staged) "[staged]" else "[file]  "} ${it.name}"
-                }.ifBlank { "(empty)" },
-            )
-            InfoPaneCard(
-                title = "Branches",
-                content = buildString {
-                    appendLine("HEAD -> ${repo.headBranch}")
-                    repo.branches.forEach { (name, _) -> appendLine(name) }
-                }.trim(),
-            )
-            InfoPaneCard(
-                title = "Commits",
-                content = repo.commits.reversed().joinToString("\n") { "${it.id} ${it.message}" }.ifBlank { "No commits yet" },
-            )
-        }
-    }
-}
-
-@Composable
-private fun ExercisePane(
-    level: Level,
-    visibleHint: String?,
-    suggestionsExpanded: Boolean,
-    onToggleSuggestions: () -> Unit,
-    onHint: () -> Unit,
-    onReset: () -> Unit,
-) {
-    Column(
-        modifier = Modifier.fillMaxWidth(),
-        verticalArrangement = Arrangement.spacedBy(12.dp),
-    ) {
-        Text(level.title, style = MaterialTheme.typography.titleLarge, color = TextPrimary)
-        Text(level.description, color = TextSecondary)
-        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
-            Button(
-                onClick = onHint,
-                colors = ButtonDefaults.buttonColors(
-                    containerColor = Accent,
-                    contentColor = Color.Black,
-                ),
-            ) {
-                Text("Hint")
-            }
-            TextButton(
-                onClick = onToggleSuggestions,
-                colors = ButtonDefaults.textButtonColors(contentColor = Accent),
-            ) {
-                Text("Suggestions")
-            }
-            TextButton(
-                onClick = onReset,
-                colors = ButtonDefaults.textButtonColors(contentColor = Accent),
-            ) {
-                Text("Reset level")
-            }
-        }
-        if (suggestionsExpanded && level.commandSuggestions.isNotEmpty()) {
-            Text("Suggestions", color = TextPrimary, fontWeight = FontWeight.Bold)
-            level.commandSuggestions.forEach { suggestion ->
-                Text(suggestion, color = TextSecondary, fontFamily = FontFamily.Monospace)
-            }
-        }
-        if (visibleHint != null) {
-            Text("Hint", color = TextPrimary, fontWeight = FontWeight.Bold)
-            Text(visibleHint, color = TextSecondary)
-        }
-    }
-}
-
-@Composable
-private fun InfoPaneCard(
-    title: String,
-    content: String,
-    modifier: Modifier = Modifier,
-) {
-    Card(
-        modifier = modifier.fillMaxWidth(),
-        colors = CardDefaults.cardColors(containerColor = PanelPrimary),
-        shape = RoundedCornerShape(10.dp),
-    ) {
-        Column(
-            modifier = Modifier
-                .fillMaxSize()
-                .padding(8.dp),
-            verticalArrangement = Arrangement.spacedBy(4.dp),
-        ) {
-            Text(title, color = TextPrimary, fontWeight = FontWeight.Bold)
-            Text(
-                content,
-                color = TextSecondary,
-                fontFamily = FontFamily.Monospace,
-            )
-        }
-    }
-}
-
-@OptIn(ExperimentalFoundationApi::class)
-@Composable
-private fun TerminalPane(
-    output: List<String>,
-    inputFieldVersion: Int,
-    commandInput: TextFieldValue,
-    onValueChange: (TextFieldValue) -> Unit,
-    onRun: () -> Unit,
-    onTab: () -> Unit,
-    onHelp: () -> Unit,
-    onCursorLeft: () -> Unit,
-    onCursorRight: () -> Unit,
-    onHistoryUp: () -> Unit,
-    onHistoryDown: () -> Unit,
-) {
-    val configuration = LocalConfiguration.current
-    val focusRequester = remember { FocusRequester() }
-    val bringIntoViewRequester = remember { BringIntoViewRequester() }
-    val focusManager = LocalFocusManager.current
-    val keyboardController = LocalSoftwareKeyboardController.current
-    val horizontalScroll = rememberScrollState()
-    val outputVerticalScroll = rememberScrollState()
-    val terminalMinWidth = 80.dp * 7.2f
-    val terminalPaneMaxHeight = configuration.screenHeightDp.dp * 0.7f
-    val reservedControlsHeight = 86.dp
-    val maxOutputHeight = (terminalPaneMaxHeight - reservedControlsHeight).coerceAtLeast(120.dp)
-    val outputLineHeight = 20.dp
-    val desiredOutputHeight = (output.size.coerceAtLeast(6) * outputLineHeight.value).dp.coerceAtMost(maxOutputHeight)
-
-    LaunchedEffect(inputFieldVersion) {
-        focusRequester.requestFocus()
-        keyboardController?.show()
-        horizontalScroll.scrollTo(0)
-    }
-
-    LaunchedEffect(output.size) {
-        outputVerticalScroll.animateScrollTo(outputVerticalScroll.maxValue)
-    }
-
-    LaunchedEffect(output.size, commandInput.text) {
-        if (output.isNotEmpty() && commandInput.text.isEmpty()) {
-            horizontalScroll.scrollTo(0)
-        }
-    }
-
-    fun submitCommand() {
-        focusManager.clearFocus(force = true)
-        keyboardController?.hide()
-        onRun()
-    }
-
-    Box(
-        modifier = Modifier
-            .fillMaxSize()
-            .background(TerminalBackground, RoundedCornerShape(12.dp))
-            .padding(8.dp)
-            .horizontalScroll(horizontalScroll),
-    ) {
-        Column(
-            modifier = Modifier
-                .fillMaxHeight()
-                .widthIn(min = terminalMinWidth),
-            verticalArrangement = Arrangement.spacedBy(8.dp),
-        ) {
-            Box(
-                modifier = Modifier
-                    .heightIn(min = 120.dp, max = maxOutputHeight)
-                    .height(desiredOutputHeight)
-                    .fillMaxWidth()
-                    .background(PanelPrimary, RoundedCornerShape(10.dp))
-                    .padding(8.dp)
-                    .verticalScroll(outputVerticalScroll),
-            ) {
-                Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
-                    output.forEach { line ->
-                        Text(
-                            text = line,
-                            color = if (line.startsWith("✔") || line.startsWith("🏁")) Success else TextSecondary,
-                            fontFamily = FontFamily.Monospace,
-                        )
-                    }
-                }
-            }
-            SpecialKeyBar(
-                onTab = onTab,
-                onHelp = onHelp,
-                onCursorLeft = onCursorLeft,
-                onCursorRight = onCursorRight,
-                onHistoryUp = onHistoryUp,
-                onHistoryDown = onHistoryDown,
-            )
-            Row(
-                modifier = Modifier
-                    .bringIntoViewRequester(bringIntoViewRequester)
-                    .fillMaxWidth()
-                    .widthIn(min = terminalMinWidth)
-                    .background(PanelPrimary, RoundedCornerShape(8.dp))
-                    .padding(horizontal = 8.dp, vertical = 3.dp),
-                horizontalArrangement = Arrangement.spacedBy(8.dp),
-                verticalAlignment = Alignment.CenterVertically,
-            ) {
-                Text(
-                    text = "$",
-                    color = Accent,
-                    fontFamily = FontFamily.Monospace,
-                    fontWeight = FontWeight.Bold,
-                    fontSize = 15.sp,
-                )
-                TerminalInputField(
-                    inputFieldVersion = inputFieldVersion,
-                    commandInput = commandInput,
-                    onValueChange = onValueChange,
-                    focusRequester = focusRequester,
-                    bringIntoViewRequester = bringIntoViewRequester,
-                    keyboardController = keyboardController,
-                    onSubmit = { submitCommand() },
-                )
-            }
-        }
-    }
-}
-
-@Composable
-private fun SpecialKeyBar(
-    onTab: () -> Unit,
-    onHelp: () -> Unit,
-    onCursorLeft: () -> Unit,
-    onCursorRight: () -> Unit,
-    onHistoryUp: () -> Unit,
-    onHistoryDown: () -> Unit,
-) {
-    Row(
-        modifier = Modifier.fillMaxWidth(),
-        horizontalArrangement = Arrangement.spacedBy(6.dp),
-    ) {
-        TerminalKeyButton(label = "↹", onClick = onTab, modifier = Modifier.width(56.dp), fontFamily = FontFamily.Default)
-        TerminalKeyButton(label = "?", onClick = onHelp, modifier = Modifier.width(40.dp), fontFamily = FontFamily.Default)
-        TerminalKeyButton(label = "←", onClick = onCursorLeft, modifier = Modifier.width(40.dp))
-        TerminalKeyButton(label = "→", onClick = onCursorRight, modifier = Modifier.width(40.dp))
-        TerminalKeyButton(label = "↑", onClick = onHistoryUp, modifier = Modifier.width(40.dp))
-        TerminalKeyButton(label = "↓", onClick = onHistoryDown, modifier = Modifier.width(40.dp))
-    }
-}
-
-@Composable
-private fun TerminalKeyButton(
-    label: String,
-    onClick: () -> Unit,
-    modifier: Modifier = Modifier,
-    fontFamily: FontFamily = FontFamily.Monospace,
-) {
-    Button(
-        onClick = onClick,
-        modifier = modifier.height(28.dp),
-        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 2.dp),
-        colors = ButtonDefaults.buttonColors(
-            containerColor = PanelSecondary,
-            contentColor = TextPrimary,
-        ),
-    ) {
-        Text(
-            text = label,
-            fontFamily = fontFamily,
-            fontWeight = FontWeight.Bold,
-            fontSize = 11.sp,
-        )
-    }
-}
-

app/src/main/java/com/kawomi/githugandroid/Header.kt

@@ -0,0 +1,41 @@
+package com.kawomi.githugandroid
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+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.res.painterResource
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun FixedHeader() {
+    Card(
+        colors = CardDefaults.cardColors(containerColor = PanelPrimary),
+        shape = RoundedCornerShape(14.dp),
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 12.dp, vertical = 10.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(10.dp),
+        ) {
+            Image(
+                painter = painterResource(id = R.drawable.githug_android_logo),
+                contentDescription = "GitHug Android logo",
+                modifier = Modifier.size(28.dp),
+            )
+            Text("GitHug Android", style = MaterialTheme.typography.titleLarge, color = TextPrimary)
+        }
+    }
+}

app/src/main/java/com/kawomi/githugandroid/Levels.kt

@@ -0,0 +1,52 @@
+package com.kawomi.githugandroid
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun LevelsPane(
+    levels: List<Level>,
+    currentLevelIndex: Int,
+    completedLevels: Set<String>,
+    onSelect: (Int) -> Unit,
+) {
+    Column(
+        modifier = Modifier.fillMaxWidth(),
+        verticalArrangement = Arrangement.spacedBy(6.dp),
+    ) {
+        levels.forEachIndexed { index, level ->
+            Card(
+                colors = CardDefaults.cardColors(
+                    containerColor = if (index == currentLevelIndex) PanelTertiary else PanelPrimary,
+                ),
+                shape = RoundedCornerShape(10.dp),
+            ) {
+                TextButton(
+                    onClick = { onSelect(index) },
+                    modifier = Modifier.fillMaxWidth(),
+                    colors = ButtonDefaults.textButtonColors(
+                        contentColor = if (index == currentLevelIndex) Accent else TextSecondary,
+                    ),
+                ) {
+                    Text(
+                        text = buildString {
+                            append(if (level.id in completedLevels) "✓ " else "• ")
+                            append(level.title)
+                        },
+                        modifier = Modifier.fillMaxWidth(),
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/kawomi/githugandroid/Panes.kt

@@ -0,0 +1,252 @@
+package com.kawomi.githugandroid
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.Orientation
+import androidx.compose.foundation.gestures.draggable
+import androidx.compose.foundation.gestures.rememberDraggableState
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+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.shape.RoundedCornerShape
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun PaneWorkspace(
+    modifier: Modifier = Modifier,
+    paneLayout: PaneLayout,
+    onMovePane: (PaneId, Int) -> Unit,
+    onTogglePane: (PaneId) -> Unit,
+    onResize: (PaneId, PaneId, Float) -> Unit,
+    onResizeFinished: () -> Unit,
+    levelsContent: @Composable () -> Unit,
+    visualContent: @Composable () -> Unit,
+    exerciseContent: @Composable () -> Unit,
+    terminalContent: @Composable () -> Unit,
+) {
+    BoxWithConstraints(modifier = modifier) {
+        val heightBasis = maxHeight.value.takeIf { it > 0f } ?: 1f
+
+        Column(
+            modifier = Modifier.fillMaxSize(),
+            verticalArrangement = Arrangement.spacedBy(0.dp),
+        ) {
+            paneLayout.order.forEachIndexed { index, paneId ->
+                val isCollapsed = paneId in paneLayout.collapsed
+                if (isCollapsed) {
+                    CollapsedPaneCard(
+                        paneId = paneId,
+                        canMoveUp = index > 0,
+                        canMoveDown = index < paneLayout.order.lastIndex,
+                        onMoveUp = { onMovePane(paneId, -1) },
+                        onMoveDown = { onMovePane(paneId, 1) },
+                        onToggleCollapse = { onTogglePane(paneId) },
+                    )
+                } else {
+                    PaneCard(
+                        paneId = paneId,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .weight((paneLayout.weights[paneId] ?: 1f).coerceAtLeast(0.6f)),
+                        canMoveUp = index > 0,
+                        canMoveDown = index < paneLayout.order.lastIndex,
+                        onMoveUp = { onMovePane(paneId, -1) },
+                        onMoveDown = { onMovePane(paneId, 1) },
+                        onToggleCollapse = { onTogglePane(paneId) },
+                    ) {
+                        when (paneId) {
+                            PaneId.LEVELS -> levelsContent()
+                            PaneId.VISUAL -> visualContent()
+                            PaneId.EXERCISE -> exerciseContent()
+                            PaneId.TERMINAL -> terminalContent()
+                        }
+                    }
+                }
+
+                if (index < paneLayout.order.lastIndex) {
+                    val upper = paneId
+                    val lower = paneLayout.order[index + 1]
+                    PaneDivider(
+                        enabled = upper !in paneLayout.collapsed && lower !in paneLayout.collapsed,
+                        onDrag = { deltaPx ->
+                            val fraction = deltaPx / heightBasis
+                            onResize(upper, lower, fraction)
+                        },
+                        onDragFinished = onResizeFinished,
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun PaneCard(
+    paneId: PaneId,
+    modifier: Modifier = Modifier,
+    canMoveUp: Boolean,
+    canMoveDown: Boolean,
+    onMoveUp: () -> Unit,
+    onMoveDown: () -> Unit,
+    onToggleCollapse: () -> Unit,
+    content: @Composable () -> Unit,
+) {
+    Card(
+        modifier = modifier,
+        colors = CardDefaults.cardColors(containerColor = PanelSecondary),
+        shape = RoundedCornerShape(16.dp),
+    ) {
+        Column(modifier = Modifier.fillMaxSize()) {
+            PaneHeader(
+                paneId = paneId,
+                collapsed = false,
+                canMoveUp = canMoveUp,
+                canMoveDown = canMoveDown,
+                onMoveUp = onMoveUp,
+                onMoveDown = onMoveDown,
+                onToggleCollapse = onToggleCollapse,
+            )
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(horizontal = 12.dp, vertical = 10.dp),
+            ) {
+                content()
+            }
+        }
+    }
+}
+
+@Composable
+private fun CollapsedPaneCard(
+    paneId: PaneId,
+    canMoveUp: Boolean,
+    canMoveDown: Boolean,
+    onMoveUp: () -> Unit,
+    onMoveDown: () -> Unit,
+    onToggleCollapse: () -> Unit,
+) {
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        colors = CardDefaults.cardColors(containerColor = PanelSecondary),
+        shape = RoundedCornerShape(16.dp),
+    ) {
+        PaneHeader(
+            paneId = paneId,
+            collapsed = true,
+            canMoveUp = canMoveUp,
+            canMoveDown = canMoveDown,
+            onMoveUp = onMoveUp,
+            onMoveDown = onMoveDown,
+            onToggleCollapse = onToggleCollapse,
+        )
+    }
+}
+
+@Composable
+private fun PaneHeader(
+    paneId: PaneId,
+    collapsed: Boolean,
+    canMoveUp: Boolean,
+    canMoveDown: Boolean,
+    onMoveUp: () -> Unit,
+    onMoveDown: () -> Unit,
+    onToggleCollapse: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(if (collapsed) PanelTertiary else PanelPrimary)
+            .padding(horizontal = 10.dp, vertical = 6.dp),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.SpaceBetween,
+    ) {
+        Text(paneId.title, color = TextPrimary, fontWeight = FontWeight.Bold)
+        Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
+            HeaderActionButton(label = if (collapsed) "Expand" else "Collapse", onClick = onToggleCollapse)
+            HeaderActionButton(label = "↑", enabled = canMoveUp, onClick = onMoveUp)
+            HeaderActionButton(label = "↓", enabled = canMoveDown, onClick = onMoveDown)
+        }
+    }
+}
+
+@Composable
+private fun HeaderActionButton(
+    label: String,
+    enabled: Boolean = true,
+    onClick: () -> Unit,
+) {
+    TextButton(
+        onClick = onClick,
+        enabled = enabled,
+        contentPadding = PaddingValues(horizontal = 6.dp, vertical = 0.dp),
+        colors = ButtonDefaults.textButtonColors(
+            contentColor = Accent,
+            disabledContentColor = TextMuted,
+        ),
+    ) {
+        Text(label, fontSize = 11.sp)
+    }
+}
+
+@Composable
+private fun PaneDivider(
+    enabled: Boolean,
+    onDrag: (Float) -> Unit,
+    onDragFinished: () -> Unit,
+) {
+    val dragState = rememberDraggableState { delta ->
+        if (enabled) onDrag(delta)
+    }
+
+    Box(
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(18.dp)
+            .draggable(
+                state = dragState,
+                orientation = Orientation.Vertical,
+                enabled = enabled,
+                onDragStopped = { onDragFinished() },
+            ),
+        contentAlignment = Alignment.CenterStart,
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(1.dp)
+                .background(if (enabled) Accent.copy(alpha = 0.45f) else PanelTertiary),
+        )
+        Card(
+            colors = CardDefaults.cardColors(
+                containerColor = if (enabled) PanelPrimary else PanelTertiary,
+            ),
+            shape = RoundedCornerShape(999.dp),
+            modifier = Modifier.padding(start = 28.dp),
+        ) {
+            Text(
+                text = "↕",
+                color = if (enabled) Accent else TextMuted,
+                modifier = Modifier.padding(horizontal = 8.dp, vertical = 1.dp),
+                fontSize = 13.sp,
+                fontWeight = FontWeight.ExtraBold,
+            )
+        }
+    }
+}

app/src/main/java/com/kawomi/githugandroid/Terminal.kt

@@ -0,0 +1,291 @@
+package com.kawomi.githugandroid
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.relocation.BringIntoViewRequester
+import androidx.compose.foundation.relocation.bringIntoViewRequester
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.key
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalFocusManager
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun TerminalPane(
+    output: List<String>,
+    inputFieldVersion: Int,
+    commandInput: TextFieldValue,
+    onValueChange: (TextFieldValue) -> Unit,
+    onRun: () -> Unit,
+    onTab: () -> Unit,
+    onHelp: () -> Unit,
+    onCursorLeft: () -> Unit,
+    onCursorRight: () -> Unit,
+    onHistoryUp: () -> Unit,
+    onHistoryDown: () -> Unit,
+) {
+    val configuration = LocalConfiguration.current
+    val focusRequester = remember { FocusRequester() }
+    val bringIntoViewRequester = remember { BringIntoViewRequester() }
+    val focusManager = LocalFocusManager.current
+    val keyboardController = LocalSoftwareKeyboardController.current
+    val horizontalScroll = rememberScrollState()
+    val outputVerticalScroll = rememberScrollState()
+    val terminalMinWidth = 80.dp * 7.2f
+    val terminalPaneMaxHeight = configuration.screenHeightDp.dp * 0.7f
+    val reservedControlsHeight = 86.dp
+    val maxOutputHeight = (terminalPaneMaxHeight - reservedControlsHeight).coerceAtLeast(120.dp)
+    val outputLineHeight = 20.dp
+    val desiredOutputHeight = (output.size.coerceAtLeast(6) * outputLineHeight.value).dp.coerceAtMost(maxOutputHeight)
+
+    LaunchedEffect(inputFieldVersion) {
+        focusRequester.requestFocus()
+        keyboardController?.show()
+        horizontalScroll.scrollTo(0)
+    }
+
+    LaunchedEffect(output.size) {
+        outputVerticalScroll.animateScrollTo(outputVerticalScroll.maxValue)
+    }
+
+    LaunchedEffect(output.size, commandInput.text) {
+        if (output.isNotEmpty() && commandInput.text.isEmpty()) {
+            horizontalScroll.scrollTo(0)
+        }
+    }
+
+    fun submitCommand() {
+        focusManager.clearFocus(force = true)
+        keyboardController?.hide()
+        onRun()
+    }
+
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(TerminalBackground, RoundedCornerShape(12.dp))
+            .padding(8.dp)
+            .horizontalScroll(horizontalScroll),
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxHeight()
+                .widthIn(min = terminalMinWidth),
+            verticalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Box(
+                modifier = Modifier
+                    .heightIn(min = 120.dp, max = maxOutputHeight)
+                    .height(desiredOutputHeight)
+                    .fillMaxWidth()
+                    .background(PanelPrimary, RoundedCornerShape(10.dp))
+                    .padding(8.dp)
+                    .verticalScroll(outputVerticalScroll),
+            ) {
+                Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                    output.forEach { line ->
+                        Text(
+                            text = line,
+                            color = if (line.startsWith("✔") || line.startsWith("🏁")) Success else TextSecondary,
+                            fontFamily = FontFamily.Monospace,
+                        )
+                    }
+                }
+            }
+            SpecialKeyBar(
+                onTab = onTab,
+                onHelp = onHelp,
+                onCursorLeft = onCursorLeft,
+                onCursorRight = onCursorRight,
+                onHistoryUp = onHistoryUp,
+                onHistoryDown = onHistoryDown,
+            )
+            Row(
+                modifier = Modifier
+                    .bringIntoViewRequester(bringIntoViewRequester)
+                    .fillMaxWidth()
+                    .widthIn(min = terminalMinWidth)
+                    .background(PanelPrimary, RoundedCornerShape(8.dp))
+                    .padding(horizontal = 8.dp, vertical = 3.dp),
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                Text(
+                    text = "$",
+                    color = Accent,
+                    fontFamily = FontFamily.Monospace,
+                    fontWeight = FontWeight.Bold,
+                    fontSize = 15.sp,
+                )
+                TerminalInputField(
+                    inputFieldVersion = inputFieldVersion,
+                    commandInput = commandInput,
+                    onValueChange = onValueChange,
+                    focusRequester = focusRequester,
+                    bringIntoViewRequester = bringIntoViewRequester,
+                    keyboardController = keyboardController,
+                    onSubmit = { submitCommand() },
+                )
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+private fun RowScope.TerminalInputField(
+    inputFieldVersion: Int,
+    commandInput: TextFieldValue,
+    onValueChange: (TextFieldValue) -> Unit,
+    focusRequester: FocusRequester,
+    bringIntoViewRequester: BringIntoViewRequester,
+    keyboardController: androidx.compose.ui.platform.SoftwareKeyboardController?,
+    onSubmit: () -> Unit,
+) {
+    val scope = rememberCoroutineScope()
+
+    key(inputFieldVersion) {
+        BasicTextField(
+            value = commandInput,
+            onValueChange = onValueChange,
+            modifier = Modifier
+                .weight(1f)
+                .focusRequester(focusRequester)
+                .bringIntoViewRequester(bringIntoViewRequester)
+                .onFocusChanged { state ->
+                    if (state.isFocused) {
+                        keyboardController?.show()
+                        scope.launch {
+                            delay(150)
+                            bringIntoViewRequester.bringIntoView()
+                        }
+                    }
+                },
+            singleLine = true,
+            textStyle = TextStyle(
+                color = TextPrimary,
+                fontFamily = FontFamily.Monospace,
+                fontSize = 15.sp,
+                fontWeight = FontWeight.Normal,
+            ),
+            cursorBrush = SolidColor(Accent),
+            keyboardOptions = KeyboardOptions(
+                autoCorrect = false,
+                keyboardType = KeyboardType.Ascii,
+                imeAction = ImeAction.Done,
+            ),
+            keyboardActions = KeyboardActions(onDone = { onSubmit() }),
+            decorationBox = { innerTextField ->
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .background(Color.Transparent)
+                        .padding(vertical = 2.dp),
+                    contentAlignment = Alignment.CenterStart,
+                ) {
+                    if (commandInput.text.isEmpty()) {
+                        Text(
+                            text = "Enter git command",
+                            color = TextMuted.copy(alpha = 0.7f),
+                            fontFamily = FontFamily.Monospace,
+                            fontSize = 15.sp,
+                        )
+                    }
+                    innerTextField()
+                }
+            },
+        )
+    }
+}
+
+@Composable
+private fun SpecialKeyBar(
+    onTab: () -> Unit,
+    onHelp: () -> Unit,
+    onCursorLeft: () -> Unit,
+    onCursorRight: () -> Unit,
+    onHistoryUp: () -> Unit,
+    onHistoryDown: () -> Unit,
+) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        horizontalArrangement = Arrangement.spacedBy(6.dp),
+    ) {
+        TerminalKeyButton(label = "↹", onClick = onTab, modifier = Modifier.width(56.dp), fontFamily = FontFamily.Default)
+        TerminalKeyButton(label = "?", onClick = onHelp, modifier = Modifier.width(40.dp), fontFamily = FontFamily.Default)
+        TerminalKeyButton(label = "←", onClick = onCursorLeft, modifier = Modifier.width(40.dp))
+        TerminalKeyButton(label = "→", onClick = onCursorRight, modifier = Modifier.width(40.dp))
+        TerminalKeyButton(label = "↑", onClick = onHistoryUp, modifier = Modifier.width(40.dp))
+        TerminalKeyButton(label = "↓", onClick = onHistoryDown, modifier = Modifier.width(40.dp))
+    }
+}
+
+@Composable
+private fun TerminalKeyButton(
+    label: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    fontFamily: FontFamily = FontFamily.Monospace,
+) {
+    Button(
+        onClick = onClick,
+        modifier = modifier.height(28.dp),
+        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 2.dp),
+        colors = ButtonDefaults.buttonColors(
+            containerColor = PanelSecondary,
+            contentColor = TextPrimary,
+        ),
+    ) {
+        Text(
+            text = label,
+            fontFamily = fontFamily,
+            fontWeight = FontWeight.Bold,
+            fontSize = 11.sp,
+        )
+    }
+}

app/src/main/java/com/kawomi/githugandroid/Visual.kt

@@ -0,0 +1,103 @@
+package com.kawomi.githugandroid
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun VisualPane(repo: RepoState) {
+    val configuration = LocalConfiguration.current
+    val isWide = configuration.screenWidthDp >= 840
+
+    if (isWide) {
+        Row(
+            modifier = Modifier.fillMaxSize(),
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            InfoPaneCard(
+                title = "Workspace",
+                content = repo.files.joinToString("\n") {
+                    "${if (it.staged) "[staged]" else "[file]  "} ${it.name}"
+                }.ifBlank { "(empty)" },
+                modifier = Modifier.weight(1f),
+            )
+            InfoPaneCard(
+                title = "Branches",
+                content = buildString {
+                    appendLine("HEAD -> ${repo.headBranch}")
+                    repo.branches.forEach { (name, _) -> appendLine(name) }
+                }.trim(),
+                modifier = Modifier.weight(1f),
+            )
+            InfoPaneCard(
+                title = "Commits",
+                content = repo.commits.reversed().joinToString("\n") { "${it.id} ${it.message}" }.ifBlank { "No commits yet" },
+                modifier = Modifier.weight(1f),
+            )
+        }
+    } else {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth(),
+            verticalArrangement = Arrangement.spacedBy(10.dp),
+        ) {
+            InfoPaneCard(
+                title = "Workspace",
+                content = repo.files.joinToString("\n") {
+                    "${if (it.staged) "[staged]" else "[file]  "} ${it.name}"
+                }.ifBlank { "(empty)" },
+            )
+            InfoPaneCard(
+                title = "Branches",
+                content = buildString {
+                    appendLine("HEAD -> ${repo.headBranch}")
+                    repo.branches.forEach { (name, _) -> appendLine(name) }
+                }.trim(),
+            )
+            InfoPaneCard(
+                title = "Commits",
+                content = repo.commits.reversed().joinToString("\n") { "${it.id} ${it.message}" }.ifBlank { "No commits yet" },
+            )
+        }
+    }
+}
+
+@Composable
+fun InfoPaneCard(
+    title: String,
+    content: String,
+    modifier: Modifier = Modifier,
+) {
+    Card(
+        modifier = modifier.fillMaxWidth(),
+        colors = CardDefaults.cardColors(containerColor = PanelPrimary),
+        shape = RoundedCornerShape(10.dp),
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(8.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+        ) {
+            Text(title, color = TextPrimary, fontWeight = FontWeight.Bold)
+            Text(
+                content,
+                color = TextSecondary,
+                fontFamily = FontFamily.Monospace,
+            )
+        }
+    }
+}