Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>

Andromida/App/Views/History/HistoryDayDetailSheet.swift

@@ -78,6 +78,7 @@ struct HistoryDayDetailSheet: View {
         .presentationBackground(AppSurface.primary)
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     private var emptyState: some View {

Andromida/App/Views/History/HistoryView.swift

@@ -17,6 +17,7 @@ struct IdentifiableDate: Identifiable {
 
 struct HistoryView: View {
     @Bindable var store: RitualStore
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
     @State private var selectedRitual: Ritual?
     @State private var selectedDateItem: IdentifiableDate?
     @State private var monthsToShow = 2
@@ -27,6 +28,21 @@ struct HistoryView: View {
     private let baseMonthsToShow = 2
     private let monthChunkSize = 6
     
+    /// Whether to use wide layout (2 columns) on iPad/landscape
+    private var useWideLayout: Bool {
+        horizontalSizeClass == .regular
+    }
+    
+    /// Grid columns for month cards - 2 columns on regular width, 1 on compact
+    private var monthColumns: [GridItem] {
+        AdaptiveColumns.columns(
+            compactCount: 1,
+            regularCount: 2,
+            spacing: Design.Spacing.large,
+            horizontalSizeClass: horizontalSizeClass
+        )
+    }
+    
     /// Generate months based on expanded state
     /// - Collapsed: Last month + current month (2 months)
     /// - Expanded: Up to 12 months of history
@@ -73,7 +89,8 @@ struct HistoryView: View {
                 // Ritual filter picker
                 ritualPicker
                 
-                // Month calendars
+                // Month calendars - 2-column grid on iPad/landscape
+                LazyVGrid(columns: monthColumns, alignment: .leading, spacing: Design.Spacing.large) {
                     ForEach(months, id: \.self) { month in
                         HistoryMonthView(
                             month: month,
@@ -87,6 +104,7 @@ struct HistoryView: View {
                             }
                         )
                     }
+                }
                 .id(refreshToken)
             }
             .padding(Design.Spacing.large)

Andromida/App/Views/Insights/Components/InsightDetailSheet.swift

@@ -74,6 +74,7 @@ struct InsightDetailSheet: View {
                 }
             }
         }
+        .presentationSizing(.form)
     }
     
     // MARK: - Header Section

Andromida/App/Views/Onboarding/SetupWizardView.swift

@@ -85,7 +85,7 @@ struct SetupWizardView: View {
                         .padding(.horizontal, Design.Spacing.large)
                 }
                 
-                // Content
+                // Content - constrained width on iPad for better readability
                 Group {
                     switch currentStep {
                     case .welcome:
@@ -128,6 +128,7 @@ struct SetupWizardView: View {
                         WhatsNextStepView(onComplete: onComplete)
                     }
                 }
+                .adaptiveContentWidth(maxWidth: Design.Size.maxContentWidthPortrait)
                 .transition(.asymmetric(
                     insertion: .move(edge: .trailing).combined(with: .opacity),
                     removal: .move(edge: .leading).combined(with: .opacity)

Andromida/App/Views/Rituals/RitualDetailView.swift

@@ -94,6 +94,7 @@ struct RitualDetailView: View {
                 }
             }
             .padding(Design.Spacing.large)
+            .adaptiveContentWidth()
         }
         .background(LinearGradient(
             colors: [AppSurface.primary, AppSurface.secondary],

Andromida/App/Views/Rituals/RitualsView.swift

@@ -4,6 +4,7 @@ import Bedrock
 struct RitualsView: View {
     @Bindable var store: RitualStore
     @Bindable var categoryStore: CategoryStore
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
     @State private var selectedTab: RitualsTab = .current
     @State private var showingPresetLibrary = false
     @State private var showingCreateRitual = false
@@ -11,6 +12,16 @@ struct RitualsView: View {
     @State private var ritualToRestart: Ritual?
     @State private var refreshToken = UUID()
     
+    /// Grid columns for ritual cards - 2 columns on regular width, 1 on compact
+    private var ritualColumns: [GridItem] {
+        AdaptiveColumns.columns(
+            compactCount: 1,
+            regularCount: 2,
+            spacing: Design.Spacing.medium,
+            horizontalSizeClass: horizontalSizeClass
+        )
+    }
+
     enum RitualsTab: String, CaseIterable {
         case current
         case past
@@ -44,6 +55,7 @@ struct RitualsView: View {
             }
             .id(refreshToken)
             .padding(Design.Spacing.large)
+            .adaptiveContentWidth()
         }
         .background(LinearGradient(
             colors: [AppSurface.primary, AppSurface.secondary],
@@ -137,6 +149,8 @@ struct RitualsView: View {
                     }
                     .padding(.top, Design.Spacing.small)
                     
+                    // Use 2-column grid on iPad/landscape
+                    LazyVGrid(columns: ritualColumns, spacing: Design.Spacing.medium) {
                         ForEach(group.rituals) { ritual in
                             currentRitualRow(for: ritual)
                         }
@@ -144,6 +158,7 @@ struct RitualsView: View {
                 }
             }
         }
+    }
     
     // MARK: - Past Tab Content
     
@@ -152,7 +167,8 @@ struct RitualsView: View {
         if store.pastRituals.isEmpty {
             pastEmptyState
         } else {
-            VStack(spacing: Design.Spacing.medium) {
+            // Use 2-column grid on iPad/landscape
+            LazyVGrid(columns: ritualColumns, spacing: Design.Spacing.medium) {
                 ForEach(store.pastRituals) { ritual in
                     pastRitualRow(for: ritual)
                 }

Andromida/App/Views/Rituals/Sheets/ArcDetailSheet.swift

@@ -96,6 +96,7 @@ struct ArcDetailSheet: View {
                 )
             }
         }
+        .presentationSizing(.form)
     }
     
     /// Returns habit completions for a specific date within this arc

Andromida/App/Views/Rituals/Sheets/ArcRenewalSheet.swift

@@ -58,6 +58,7 @@ struct ArcRenewalSheet: View {
         .sheet(isPresented: $showingEditSheet) {
             RitualEditSheet(store: store, categoryStore: categoryStore, ritual: ritual)
         }
+        .presentationSizing(.form)
     }
     
     private var celebrationHeader: some View {

Andromida/App/Views/Rituals/Sheets/PresetLibrarySheet.swift

@@ -47,6 +47,7 @@ struct PresetLibrarySheet: View {
         }
         .presentationDetents([.large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     // MARK: - Category Picker
@@ -196,6 +197,7 @@ struct PresetDetailSheet: View {
         }
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     private var headerSection: some View {

Andromida/App/Views/Rituals/Sheets/RitualEditSheet.swift

@@ -93,6 +93,7 @@ struct RitualEditSheet: View {
         }
         .presentationDetents([.large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     // MARK: - Form Sections
@@ -556,6 +557,7 @@ struct IconPickerSheet: View {
         }
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     private func iconButton(_ icon: String) -> some View {
@@ -672,6 +674,7 @@ struct HabitIconPickerSheet: View {
         }
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
+        .presentationSizing(.form)
     }
     
     private func iconButton(_ icon: String) -> some View {

Andromida/App/Views/Settings/CategoryEditSheet.swift

@@ -120,6 +120,7 @@ struct CategoryEditSheet: View {
             }
         }
         .presentationDetents([.medium])
+        .presentationSizing(.form)
     }
     
     private func loadCategory() {

Andromida/App/Views/Settings/SettingsView.swift

@@ -156,6 +156,7 @@ struct SettingsView: View {
                 Spacer(minLength: Design.Spacing.xxxLarge)
             }
             .padding(.horizontal, Design.Spacing.large)
+            .adaptiveContentWidth(maxWidth: Design.Size.maxContentWidthPortrait)
         }
         .onAppear {
             store.refresh()

Andromida/App/Views/Today/TodayView.swift

@@ -4,6 +4,7 @@ import Bedrock
 struct TodayView: View {
     @Bindable var store: RitualStore
     @Bindable var categoryStore: CategoryStore
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
     
     /// Rituals to show now based on current time of day
     private var todayRituals: [Ritual] {
@@ -20,6 +21,21 @@ struct TodayView: View {
         store.ritualNeedingRenewal != nil
     }
     
+    /// Whether to use wide layout on iPad/landscape
+    private var useWideLayout: Bool {
+        horizontalSizeClass == .regular
+    }
+    
+    /// Grid columns for ritual sections - 2 columns on regular width when multiple rituals
+    private var ritualColumns: [GridItem] {
+        AdaptiveColumns.columns(
+            compactCount: 1,
+            regularCount: todayRituals.count > 1 ? 2 : 1,
+            spacing: Design.Spacing.large,
+            horizontalSizeClass: horizontalSizeClass
+        )
+    }
+
     var body: some View {
         ScrollView(.vertical, showsIndicators: false) {
             VStack(alignment: .leading, spacing: Design.Spacing.large) {
@@ -34,6 +50,8 @@ struct TodayView: View {
                         TodayEmptyStateView(store: store, categoryStore: categoryStore)
                     }
                 } else {
+                    // Use 2-column grid on iPad/landscape when multiple rituals
+                    LazyVGrid(columns: ritualColumns, alignment: .leading, spacing: Design.Spacing.large) {
                         ForEach(todayRituals) { ritual in
                             TodayRitualSectionView(
                                 focusTitle: ritual.title,
@@ -48,7 +66,9 @@ struct TodayView: View {
                         }
                     }
                 }
+            }
             .padding(Design.Spacing.large)
+            .adaptiveContentWidth()
         }
         .background(LinearGradient(
             colors: [AppSurface.primary, AppSurface.secondary],

Andromida/Shared/AdaptiveLayout.swift

@@ -0,0 +1,93 @@
+//
+//  AdaptiveLayout.swift
+//  Andromida
+//
+//  Reusable layout modifiers and helpers for responsive iPad/iPhone layouts.
+//
+
+import SwiftUI
+import Bedrock
+
+// MARK: - Adaptive Content Width Modifier
+
+/// A view modifier that constrains content width on regular-width displays (iPad, large iPhone landscape).
+/// On compact-width displays (iPhone portrait), content remains full-width.
+struct AdaptiveContentWidth: ViewModifier {
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
+    
+    let maxWidth: CGFloat
+    let centerContent: Bool
+    
+    init(maxWidth: CGFloat = Design.Size.maxContentWidthLandscape, centerContent: Bool = true) {
+        self.maxWidth = maxWidth
+        self.centerContent = centerContent
+    }
+    
+    func body(content: Content) -> some View {
+        if horizontalSizeClass == .regular {
+            if centerContent {
+                content
+                    .frame(maxWidth: maxWidth)
+                    .frame(maxWidth: .infinity)
+            } else {
+                content
+                    .frame(maxWidth: maxWidth)
+            }
+        } else {
+            content
+        }
+    }
+}
+
+extension View {
+    /// Constrains the view's width on regular-width displays (iPad, large iPhone landscape).
+    /// - Parameters:
+    ///   - maxWidth: The maximum width to constrain to. Defaults to `Design.Size.maxContentWidthLandscape` (800pt).
+    ///   - centered: Whether to center the content horizontally. Defaults to `true`.
+    /// - Returns: A view with adaptive width constraints applied.
+    func adaptiveContentWidth(
+        maxWidth: CGFloat = Design.Size.maxContentWidthLandscape,
+        centered: Bool = true
+    ) -> some View {
+        modifier(AdaptiveContentWidth(maxWidth: maxWidth, centerContent: centered))
+    }
+}
+
+// MARK: - Adaptive Grid Columns
+
+/// Helper for creating responsive grid columns based on horizontal size class.
+enum AdaptiveColumns {
+    /// Creates grid columns that adapt based on horizontal size class.
+    /// - Parameters:
+    ///   - compactCount: Number of columns for compact width (iPhone portrait). Defaults to 1.
+    ///   - regularCount: Number of columns for regular width (iPad, landscape). Defaults to 2.
+    ///   - spacing: Spacing between columns. Defaults to `Design.Spacing.medium`.
+    ///   - horizontalSizeClass: The current horizontal size class.
+    /// - Returns: An array of `GridItem` configured for the given size class.
+    static func columns(
+        compactCount: Int = 1,
+        regularCount: Int = 2,
+        spacing: CGFloat = Design.Spacing.medium,
+        horizontalSizeClass: UserInterfaceSizeClass?
+    ) -> [GridItem] {
+        let count = horizontalSizeClass == .regular ? regularCount : compactCount
+        return Array(repeating: GridItem(.flexible(), spacing: spacing), count: count)
+    }
+}
+
+// MARK: - Use Wide Layout Helper
+
+/// Environment-based helper view that provides layout decisions.
+struct AdaptiveLayoutReader<Content: View>: View {
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
+    
+    let content: (_ useWideLayout: Bool) -> Content
+    
+    init(@ViewBuilder content: @escaping (_ useWideLayout: Bool) -> Content) {
+        self.content = content
+    }
+    
+    var body: some View {
+        content(horizontalSizeClass == .regular)
+    }
+}