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

AGENTS.md

@@ -0,0 +1,9 @@
+Use /ios-18-role
+read the PRD.md
+read the README.md
+
+Always update the PRD.md and README.md when there are code changes that might cause these files to require those changes documented.
+
+Always try to build after coding to ensure no build errors exist and use the iPhone 17 Pro Max using 26.2 simulator.
+
+Try and use xcode build mcp if it is working and test using screenshots when asked.

PRD.md

@@ -136,6 +136,7 @@ TheNoiseClock is a SwiftUI-based iOS application that combines a customizable di
 - **Orientation-aware spacing**: Different spacing values for portrait vs landscape
 - **Consistent segment spacing**: Uniform spacing between hours, minutes, seconds
 - **Dot weight matching**: Colon dots scale with selected font weight
+- **Dot sizing balance**: Tuned dot sizing multipliers preserve readability while maximizing digit size in tight layouts
 - **Overflow prevention**: Spacing calculations prevent content clipping
 - **Perfect centering**: All elements centered both horizontally and vertically
 - **Component consolidation**: Eliminated redundant HorizontalColon and VerticalColon views

TheNoiseClock/Features/Clock/Views/ClockView.swift

@@ -11,6 +11,9 @@ import Bedrock
 /// Main clock display view with settings and display mode
 struct ClockView: View {
     
+    // MARK: - Debug Configuration
+    private static let debugShowSafeAreas = false
+    
     // MARK: - Properties
     @Bindable var viewModel: ClockViewModel
     @State private var idleTimer: Timer?
@@ -18,33 +21,62 @@ struct ClockView: View {
     
     // MARK: - Body
     var body: some View {
-        ZStack {
-            viewModel.style.effectiveBackgroundColor
-                .ignoresSafeArea()
-            
         GeometryReader { geometry in
-                let isPhone = UIDevice.current.userInterfaceIdiom == .phone
-                let isLandscape = geometry.size.width > geometry.size.height
-                let islandPadding: CGFloat = isLandscape && isPhone ? 120 : 0
-                let safeInset = max(geometry.safeAreaInsets.leading, geometry.safeAreaInsets.trailing)
-                let symmetricInset = isLandscape ? max(safeInset, islandPadding) : 0
+            // When ignoring safe areas, geometry.size IS the full screen
+            let screenWidth = geometry.size.width
+            let screenHeight = geometry.size.height
+            let isLandscape = screenWidth > screenHeight
+            
+            // Get safe area insets from UIWindow since GeometryReader ignores them
+            let windowInsets = Self.getWindowSafeAreaInsets()
+            let safeInsets = geometry.safeAreaInsets // May be 0 due to ignoresSafeArea
+            
+            // Dynamic Island handling:
+            // In landscape, apply symmetric padding to keep content centered
+            let dynamicIslandInset = max(windowInsets.left, windowInsets.right)
+            let symmetricInset = isLandscape ? dynamicIslandInset : 0
 
             ZStack {
-                    // Main clock display container
+                // Background extends to full screen
+                viewModel.style.effectiveBackgroundColor
+                
+                // Main clock display container with symmetric padding for Dynamic Island
                 ClockDisplayContainer(
                     currentTime: viewModel.currentTime,
                     style: viewModel.style,
                     isDisplayMode: viewModel.isDisplayMode
                 )
+                .padding(.leading, symmetricInset)
+                .padding(.trailing, symmetricInset)
+                .debugBorder(Self.debugShowSafeAreas, color: .yellow, label: "ClockDisplayContainer")
                 
-                    // Top overlay container
+                // Top overlay container with symmetric padding
                 ClockOverlayContainer(style: viewModel.style)
-                    
+                    .padding(.leading, symmetricInset)
+                    .padding(.trailing, symmetricInset)
             }
-                .padding(.horizontal, symmetricInset)
+            .frame(width: screenWidth, height: screenHeight)
+            .border(.purple, width: 3) // Debug: Full screen ZStack
+            .overlay(alignment: .bottomLeading) {
+                if Self.debugShowSafeAreas {
+                    safeAreaDebugInfo(
+                        size: geometry.size,
+                        windowInsets: windowInsets,
+                        symmetricInset: symmetricInset
+                    )
                 }
             }
-        .ignoresSafeArea()
+            .onAppear {
+                logClockLayout(size: geometry.size, safeAreaInsets: safeInsets)
+            }
+            .onChange(of: geometry.size) { _, newSize in
+                logClockLayout(size: newSize, safeAreaInsets: safeInsets)
+            }
+            .onChange(of: safeInsets) { _, newInsets in
+                logClockLayout(size: geometry.size, safeAreaInsets: newInsets)
+            }
+        }
+        .ignoresSafeArea() // Extend GeometryReader to full screen, we handle safe areas manually
         .toolbar(.hidden, for: .navigationBar)
         .statusBarHidden(true)
         .overlay {
@@ -100,6 +132,51 @@ struct ClockView: View {
         }
         resetIdleTimer()
     }
+    
+    // MARK: - Safe Area Helpers
+    /// Get safe area insets from the key window (works even when ignoring safe areas)
+    private static func getWindowSafeAreaInsets() -> UIEdgeInsets {
+        guard let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
+              let window = scene.windows.first else {
+            return .zero
+        }
+        return window.safeAreaInsets
+    }
+    
+    // MARK: - Debug Views
+    @ViewBuilder
+    private func safeAreaDebugInfo(
+        size: CGSize,
+        windowInsets: UIEdgeInsets,
+        symmetricInset: CGFloat
+    ) -> some View {
+        let isLandscape = size.width > size.height
+        let hasDynamicIsland = windowInsets.left > 0 || windowInsets.right > 0
+        
+        VStack(alignment: .leading, spacing: 2) {
+            Text("Screen: \(Int(size.width))×\(Int(size.height))")
+            Text("Window Insets: L:\(Int(windowInsets.left)) R:\(Int(windowInsets.right)) T:\(Int(windowInsets.top)) B:\(Int(windowInsets.bottom))")
+            Text("Symmetric Inset: \(Int(symmetricInset))")
+            Text("Dynamic Island: \(hasDynamicIsland && isLandscape ? "Yes" : "No")")
+            Text("Orientation: \(isLandscape ? "Landscape" : "Portrait")")
+        }
+        .font(.system(size: 10, weight: .bold, design: .monospaced))
+        .foregroundStyle(.green)
+        .padding(4)
+        .background(Color.black.opacity(0.7))
+        .clipShape(.rect(cornerRadius: 4))
+        .padding(8)
+    }
+    
+    // MARK: - Debug Logging
+    private func logClockLayout(size: CGSize, safeAreaInsets: EdgeInsets) {
+        let isLandscape = size.width > size.height
+        let safeInset = max(safeAreaInsets.leading, safeAreaInsets.trailing)
+        let symmetricInset = isLandscape ? safeInset : 0
+        Design.debugLog("[clockLayout] size=\(String(format: "%.1f", size.width))x\(String(format: "%.1f", size.height))")
+        Design.debugLog("[clockLayout] insets=(t:\(String(format: "%.1f", safeAreaInsets.top)), l:\(String(format: "%.1f", safeAreaInsets.leading)), b:\(String(format: "%.1f", safeAreaInsets.bottom)), r:\(String(format: "%.1f", safeAreaInsets.trailing)))")
+        Design.debugLog("[clockLayout] isLandscape=\(isLandscape), safeInset=\(String(format: "%.1f", safeInset)), symmetricInset=\(String(format: "%.1f", symmetricInset))")
+    }
 }
 
 // MARK: - Preview

TheNoiseClock/Features/Clock/Views/Components/ClockDisplayContainer.swift

@@ -18,19 +18,12 @@ struct ClockDisplayContainer: View {
     
     // MARK: - Body
     var body: some View {
-        return GeometryReader { geometry in
+        GeometryReader { geometry in
             let isPortrait = geometry.size.height >= geometry.size.width
             let hasOverlay = style.showBattery || style.showDate
             let topSpacing = hasOverlay ? (isPortrait ? Design.Spacing.xxLarge : Design.Spacing.large) : 0
             
-            VStack(spacing: 0) {
-                // Top spacing to account for overlay
-                if hasOverlay {
-                    Spacer()
-                        .frame(height: topSpacing)
-                }
-                
-                // Time display - fills remaining space
+            // Time display - fills all available space
             TimeDisplayView(
                 date: currentTime,
                 use24Hour: style.use24Hour,
@@ -47,10 +40,9 @@ struct ClockDisplayContainer: View {
                 forceHorizontalMode: style.forceHorizontalMode,
                 isDisplayMode: isDisplayMode
             )
+            .padding(.top, topSpacing)
+            .frame(width: geometry.size.width, height: geometry.size.height)
             .transition(.opacity)
-                
-                Spacer()
-            }
             .animation(.smooth(duration: Design.Animation.standard), value: isDisplayMode)
         }
     }

TheNoiseClock/Features/Clock/Views/Components/DigitView.swift

@@ -6,10 +6,13 @@
 //
 
 import SwiftUI
+import Bedrock
 
 /// Component for displaying a single digit with fixed width and glow effects
 struct DigitView: View {
-    @Environment(\.sizeCategory) private var sizeCategory
+    
+    // MARK: - Debug Configuration
+    private static let debugShowBorders = false
     
     let digit: String
     let fontName: FontFamily
@@ -21,9 +24,6 @@ struct DigitView: View {
     let isDisplayMode: Bool
     @Binding var fontSize: CGFloat
     
-    @State private var lastCalculatedSize: CGSize = .zero
-    @State private var isCalculating: Bool = false
-    
     init(digit: String,
          fontName: FontFamily,
          weight: Font.Weight = .regular,
@@ -45,14 +45,11 @@ struct DigitView: View {
     }
     
     var body: some View {
-        GeometryReader { geometry in
         ZStack {
             glowText
-                    .position(x: geometry.size.width / 2, y: geometry.size.height / 2)
             mainText
-                    .position(x: geometry.size.width / 2, y: geometry.size.height / 2)
-            }
         }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
     }
     
     private var glowRadius: CGFloat {
@@ -64,79 +61,26 @@ struct DigitView: View {
     }
     
     private var glowText: some View {
-        text
+        baseText
             .foregroundColor(digitColor)
             .blur(radius: glowRadius)
             .opacity(glowOpacity)
     }
     
     private var mainText: some View {
-        text
+        baseText
             .foregroundColor(digitColor)
             .opacity(opacity)
+            .debugBorder(Self.debugShowBorders, color: .orange, label: "Text")
     }
     
-    private var text: some View {
-        GeometryReader { geometry in
+    private var baseText: some View {
         Text(digit)
             .font(FontUtils.createFont(name: fontName,
                                        weight: weight,
                                        design: design,
                                        size: fontSize))
-                .frame(maxWidth: .infinity, maxHeight: .infinity)
-                .multilineTextAlignment(.center)
-                .minimumScaleFactor(0.1)
-                .lineSpacing(0)
-                .padding(.vertical, 0)
-                .padding(.horizontal, 0)
-                .baselineOffset(0)
-                .onAppear {
-                    calculateOptimalFontSize(for: geometry.size)
-                    DispatchQueue.main.async {
-                        calculateOptimalFontSize(for: geometry.size)
-                    }
-                }
-                .onChange(of: geometry.size) { _, newSize in
-                    calculateOptimalFontSize(for: newSize)
-                }
-                .onChange(of: sizeCategory) { _, _ in
-                    calculateOptimalFontSize(for: geometry.size)
-                }
-                .onChange(of: fontName) { _, _ in
-                    calculateOptimalFontSize(for: geometry.size)
-                }
-                .onChange(of: weight) { _, _ in
-                    calculateOptimalFontSize(for: geometry.size)
-                }
-                .onChange(of: design) { _, _ in
-                    calculateOptimalFontSize(for: geometry.size)
-                }
-        }
-    }
-    
-    private func calculateOptimalFontSize(for size: CGSize) {
-        // Prevent multiple calculations for the same size
-        guard size != lastCalculatedSize && !isCalculating else { return }
-        
-        // Prevent multiple updates per frame
-        guard !isCalculating else { return }
-        isCalculating = true
-        
-        let optimalSize = FontUtils.calculateOptimalFontSize(digit: digit,
-                                                             fontName: fontName,
-                                                             weight: weight,
-                                                             design: design,
-                                                             for: size,
-                                                             isDisplayMode: false)
-        
-        // Only update if the size is significantly different to prevent micro-adjustments
-        fontSize = optimalSize
-        lastCalculatedSize = size
-
-        // Reset calculation flag after a brief delay to allow for frame completion
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.016) { // ~60fps
-            isCalculating = false
-        }
+            .lineLimit(1)
     }
 }
 

TheNoiseClock/Features/Clock/Views/Components/TimeDisplayView.swift

@@ -11,6 +11,18 @@ import Bedrock
 /// Component for displaying segmented time with customizable formatting
 struct TimeDisplayView: View {
     
+    // MARK: - Debug Configuration
+    /// When true, shows static "88:88:88" to debug font sizing
+    private static let debugStaticTime = false
+    /// When true, shows debug overlays with sizing info
+    private static let debugShowOverlays = false
+    /// Static hour value for debug mode
+    private static let debugHour = "88"
+    /// Static minute value for debug mode
+    private static let debugMinute = "88"
+    /// Static seconds value for debug mode
+    private static let debugSeconds = "88"
+    
     // MARK: - Properties
     let date: Date
     let use24Hour: Bool
@@ -29,6 +41,13 @@ struct TimeDisplayView: View {
     @State var fontSize: CGFloat = 100
     @State private var lastCalculatedContainerSize: CGSize = .zero
     
+    // MARK: - Layout Constants
+    private enum Layout {
+        static let dotDiameterMultiplier: CGFloat = 0.65
+        static let dotSpacingPortraitMultiplier: CGFloat = 0.16
+        static let dotSpacingLandscapeMultiplier: CGFloat = 0.22
+    }
+    
     // MARK: - Formatters
     private static let hour24DF: DateFormatter = {
         let df = DateFormatter()
@@ -72,19 +91,31 @@ struct TimeDisplayView: View {
             let portraitMode = containerSize.height >= containerSize.width
             let portrait = !forceHorizontalMode && containerSize.height >= containerSize.width
 
-            // Time components
-            let hour = use24Hour ? Self.hour24DF.string(from: date) : Self.hour12DF.string(from: date)
-            let minute = Self.minuteDF.string(from: date)
-            let secondsText = Self.secondDF.string(from: date)
+            // Time components - use debug static values if enabled
+            let hour: String
+            let minute: String
+            let secondsText: String
+            
+            if Self.debugStaticTime {
+                hour = Self.debugHour
+                minute = Self.debugMinute
+                secondsText = Self.debugSeconds
+            } else {
+                hour = use24Hour ? Self.hour24DF.string(from: date) : Self.hour12DF.string(from: date)
+                minute = Self.minuteDF.string(from: date)
+                secondsText = Self.secondDF.string(from: date)
+            }
             
             
-            // AM/PM badge
-            let shouldShowAmPm = showAmPm && !use24Hour
-            let amPmText = Self.amPmDF.string(from: date).uppercased()
+            // AM/PM badge - hide in debug mode
+            let shouldShowAmPm = !Self.debugStaticTime && showAmPm && !use24Hour
+            let amPmText = Self.debugStaticTime ? "" : Self.amPmDF.string(from: date).uppercased()
             
             // Separators - reasonable spacing with extra padding in landscape
-            let dotDiameter = fontSize * 0.75
-            let dotSpacing = portrait ? fontSize * 0.18 : fontSize * 0.25  // More spacing in landscape
+            let dotDiameter = fontSize * Layout.dotDiameterMultiplier
+            let dotSpacing = portrait
+            ? fontSize * Layout.dotSpacingPortraitMultiplier
+            : fontSize * Layout.dotSpacingLandscapeMultiplier
 
             // Simple scaling - let the content size naturally and apply manual scale
             let finalScale = stretched ? 1.0 : CGFloat(max(0.1, min(manualScale, 1.0)))
@@ -92,7 +123,7 @@ struct TimeDisplayView: View {
             // Time display with consistent centering and stable layout
             return Group {
                 if portrait {
-                    VStack(alignment: .center) {
+                    VStack(alignment: .center, spacing: 0) {
                         TimeSegment(text: hour, fontSize: $fontSize, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontFamily: fontFamily, fontWeight: fontWeight, fontDesign: fontDesign, isDisplayMode: isDisplayMode)
                         ColonView(dotDiameter: dotDiameter, spacing: dotSpacing, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontWeight: fontWeight, isHorizontal: true)
                         TimeSegment(text: minute, fontSize: $fontSize, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontFamily: fontFamily, fontWeight: fontWeight, fontDesign: fontDesign, isDisplayMode: isDisplayMode)
@@ -102,19 +133,32 @@ struct TimeDisplayView: View {
                         }
                     }
                 } else {
-                    HStack(alignment: .center) {
+                    // Landscape mode - use fixed digit widths for stable layout
+                    // Each digit gets the same width (based on "8") so clock doesn't shift
+                    let fixedDigitWidth = FontUtils.digitWidth(
+                        fontName: fontFamily,
+                        weight: fontWeight,
+                        design: fontDesign,
+                        fontSize: fontSize
+                    )
+                    let segmentWidth = fixedDigitWidth * 2 // Each segment has 2 digits
+                    
+                    HStack(alignment: .center, spacing: 0) {
                         TimeSegment(text: hour, fontSize: $fontSize, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontFamily: fontFamily, fontWeight: fontWeight, fontDesign: fontDesign, isDisplayMode: isDisplayMode)
+                            .frame(width: segmentWidth, height: containerSize.height)
                         ColonView(dotDiameter: dotDiameter, spacing: dotSpacing, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontWeight: fontWeight, isHorizontal: false)
+                            .frame(width: dotDiameter, height: containerSize.height)
                         TimeSegment(text: minute, fontSize: $fontSize, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontFamily: fontFamily, fontWeight: fontWeight, fontDesign: fontDesign, isDisplayMode: isDisplayMode)
+                            .frame(width: segmentWidth, height: containerSize.height)
                         if showSeconds {
                             ColonView(dotDiameter: dotDiameter, spacing: dotSpacing, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontWeight: fontWeight, isHorizontal: false)
+                                .frame(width: dotDiameter, height: containerSize.height)
                             TimeSegment(text: secondsText, fontSize: $fontSize, opacity: clockOpacity, digitColor: digitColor, glowIntensity: glowIntensity, fontFamily: fontFamily, fontWeight: fontWeight, fontDesign: fontDesign, isDisplayMode: isDisplayMode)
+                                .frame(width: segmentWidth, height: containerSize.height)
                         }
                     }
-                    .frame(maxWidth: .infinity)
                 }
             }
-            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
             .overlay(alignment: .bottomTrailing) {
                 if shouldShowAmPm {
                     Text(amPmText)
@@ -138,6 +182,12 @@ struct TimeDisplayView: View {
             .animation(.smooth(duration: Design.Animation.standard), value: showSeconds) // Smooth animation for seconds toggle
             .minimumScaleFactor(0.1)
             .clipped() // Prevent overflow beyond bounds
+            .overlay(alignment: .topLeading) {
+                if Self.debugShowOverlays {
+                    debugInfoOverlay(containerSize: containerSize, portrait: portrait)
+                }
+            }
+            .debugBorder(Self.debugShowOverlays, color: .cyan, label: "TimeDisplayView")
             .onAppear {
                 updateFontSize(containerSize: containerSize, portrait: portrait, showSeconds: showSeconds)
             }
@@ -157,36 +207,102 @@ struct TimeDisplayView: View {
                 updateFontSize(containerSize: containerSize, portrait: portrait, showSeconds: showSeconds)
             }
         }
-        //.border(.yellow, width: 1)
         .frame(maxWidth: .infinity, maxHeight: .infinity)
         .onOrientationChange() // Force updates on orientation changes
     }
     
+    // MARK: - Debug Overlay
+    @ViewBuilder
+    private func debugInfoOverlay(containerSize: CGSize, portrait: Bool) -> some View {
+        let digitColumns: CGFloat = portrait ? 2.0 : (showSeconds ? 6.0 : 4.0)
+        let digitRows: CGFloat = portrait ? (showSeconds ? 3.0 : 2.0) : 1.0
+        let colonCount: CGFloat = showSeconds ? 2.0 : 1.0
+        let colonSize = fontSize * Layout.dotDiameterMultiplier
+        
+        let availableWidth = portrait
+            ? containerSize.width
+            : max(1, containerSize.width - (colonCount * colonSize))
+        let availableHeight = portrait
+            ? max(1, containerSize.height - (colonCount * colonSize))
+            : containerSize.height
+        let digitSlotSize = CGSize(
+            width: max(1, availableWidth / digitColumns),
+            height: max(1, availableHeight / digitRows)
+        )
+        
+        VStack(alignment: .leading, spacing: 2) {
+            Text("Container: \(Int(containerSize.width))×\(Int(containerSize.height))")
+            Text("Digit Slot: \(Int(digitSlotSize.width))×\(Int(digitSlotSize.height))")
+            Text("Font Size: \(Int(fontSize))")
+            Text("Cols: \(Int(digitColumns)) Rows: \(Int(digitRows))")
+            Text("Portrait: \(portrait)")
+            Text("Family: \(fontFamily.rawValue)")
+        }
+        .font(.system(size: 10, weight: .bold, design: .monospaced))
+        .foregroundStyle(.yellow)
+        .padding(4)
+        .background(Color.black.opacity(0.7))
+        .clipShape(.rect(cornerRadius: 4))
+        .padding(8)
+    }
+    
     // MARK: - Font Sizing
     private func updateFontSize(containerSize: CGSize, portrait: Bool, showSeconds: Bool) {
         guard containerSize != .zero else { return }
-        if containerSize == lastCalculatedContainerSize {
-            return
-        }
         
-        let rows = portrait ? (showSeconds ? 5.0 : 3.0) : 1.0
-        let digits = portrait ? 2.0 : (showSeconds ? 6.0 : 4.0)
+        let digitColumns: CGFloat = portrait ? 2.0 : (showSeconds ? 6.0 : 4.0)
+        let digitRows: CGFloat = portrait ? (showSeconds ? 3.0 : 2.0) : 1.0
+        let colonCount: CGFloat = showSeconds ? 2.0 : 1.0
+        let previousFontSize = fontSize
+        
+        func calculateFontSize(reservingColonSize colonSize: CGFloat) -> CGFloat {
+            let availableWidth = portrait
+            ? containerSize.width
+            : max(1, containerSize.width - (colonCount * colonSize))
+            let availableHeight = portrait
+            ? max(1, containerSize.height - (colonCount * colonSize))
+            : containerSize.height
             let digitSize = CGSize(
-            width: max(1, containerSize.width / digits),
-            height: max(1, containerSize.height / rows)
+                width: max(1, availableWidth / digitColumns),
+                height: max(1, availableHeight / digitRows)
             )
             
-        let estimated = FontUtils.calculateOptimalFontSize(
+            Design.debugLog("[clockLayout] calcFont size=\(String(format: "%.1f", containerSize.width))x\(String(format: "%.1f", containerSize.height)) portrait=\(portrait) seconds=\(showSeconds)")
+            Design.debugLog("[clockLayout] calcFont available=\(String(format: "%.1f", availableWidth))x\(String(format: "%.1f", availableHeight)) columns=\(String(format: "%.1f", digitColumns)) rows=\(String(format: "%.1f", digitRows)) colonCount=\(String(format: "%.1f", colonCount))")
+            Design.debugLog("[clockLayout] calcFont digitSize=\(String(format: "%.1f", digitSize.width))x\(String(format: "%.1f", digitSize.height)) colonSize=\(String(format: "%.1f", colonSize))")
+            
+            return FontUtils.calculateOptimalFontSize(
                 digit: "8",
                 fontName: fontFamily,
                 weight: fontWeight,
                 design: fontDesign,
                 for: digitSize,
-            isDisplayMode: false
+                isDisplayMode: isDisplayMode
             )
+        }
+        
+        var estimated = calculateFontSize(reservingColonSize: 0)
+        for _ in 0..<2 {
+            let dotDiameter = estimated * Layout.dotDiameterMultiplier
+            estimated = calculateFontSize(reservingColonSize: dotDiameter)
+        }
+        
+        if !portrait {
+            let dotDiameter = estimated * Layout.dotDiameterMultiplier
+            let dotSpacing = estimated * Layout.dotSpacingLandscapeMultiplier
+            let colonHeight = (dotDiameter * 2) + dotSpacing
+            if colonHeight > containerSize.height {
+                estimated *= containerSize.height / colonHeight
+            }
+        }
+        
+        Design.debugLog("[clockLayout] calcFont estimatedFontSize=\(String(format: "%.1f", estimated))")
 
         if abs(estimated - fontSize) > 1 {
             fontSize = estimated
+            Design.debugLog("[clockLayout] calcFont updated fontSize \(String(format: "%.1f", previousFontSize)) -> \(String(format: "%.1f", fontSize))")
+        } else {
+            Design.debugLog("[clockLayout] calcFont skipped update (current=\(String(format: "%.1f", previousFontSize)))")
         }
         lastCalculatedContainerSize = containerSize
     }

TheNoiseClock/Features/Clock/Views/Components/TimeSegment.swift

@@ -7,9 +7,14 @@
 
 import SwiftUI
 import Foundation
+import Bedrock
 
 /// Component for displaying a time segment (hours, minutes, seconds) with fixed-width digits
 struct TimeSegment: View {
+    
+    // MARK: - Debug Configuration
+    private static let debugShowBorders = false
+    
     let text: String
     @Binding var fontSize: CGFloat
     let opacity: Double
@@ -21,7 +26,15 @@ struct TimeSegment: View {
     let isDisplayMode: Bool
         
     var body: some View {
-        HStack(alignment: .center, spacing: 0) {
+        // Use fixed digit width based on widest digit ("8") for stable layout
+        let fixedDigitWidth = FontUtils.digitWidth(
+            fontName: fontFamily,
+            weight: fontWeight,
+            design: fontDesign,
+            fontSize: fontSize
+        )
+        
+        return HStack(alignment: .center, spacing: 0) {
             ForEach(Array(text.enumerated()), id: \.offset) { index, character in
                 DigitView(
                     digit: String(character),
@@ -34,11 +47,11 @@ struct TimeSegment: View {
                     fontSize: $fontSize,
                     isDisplayMode: isDisplayMode
                 )
-                //.border(.red, width: 1)
+                .frame(width: fixedDigitWidth) // Fixed width for stability
+                .debugBorder(Self.debugShowBorders, color: .red, label: "D\(index)")
             }
         }
-        //.border(Color.green, width: 1)
-        .frame(maxHeight: .infinity)
+        .debugBorder(Self.debugShowBorders, color: .green, label: "Segment")
     }
     
     // MARK: - Computed Properties

TheNoiseClock/Shared/Design/Fonts/FontFamily.swift

@@ -31,14 +31,11 @@ enum FontFamily: String, CaseIterable {
         }
     }
     
+    /// Font-specific size adjustment factor (1.0 = no adjustment)
+    /// Note: With CoreText glyph measurement, these are no longer needed
     var percentageDownsize: CGFloat {
-        switch self {
-        case .system:
-            return 0.95
-        case .georgia:
-            return 0.90
-        default: return 1
-        }
+        // All fonts now use 1.0 since we have accurate glyph measurement
+        return 1.0
     }
     
     var fontWeights: [Font.Weight] {

TheNoiseClock/Shared/Design/Fonts/FontUtils.swift

@@ -8,10 +8,17 @@
 import Foundation
 import SwiftUI
 import UIKit
+import CoreText
 
 /// Font sizing and typography utilities
 struct FontUtils {
     
+    // MARK: - Debug Configuration
+    /// Safety margin to prevent clipping (1.0 = no margin, 0.98 = 2% margin)
+    private static let safetyMargin: CGFloat = 0.98
+    /// When true, logs font sizing calculations
+    private static let debugLogging = false
+    
     static func calculateOptimalFontSize(
         digit: String,
         fontName: FontFamily,
@@ -23,7 +30,7 @@ struct FontUtils {
         var low: CGFloat = 1.0
         var high: CGFloat = 2000.0
         
-        while high - low > 0.01 {
+        while high - low > 0.5 {
             let mid = (low + high) / 2
             let testFont = createUIFont(
                 name: fontName,
@@ -31,7 +38,7 @@ struct FontUtils {
                 design: design,
                 size: mid
             )
-            let textSize = tightBoundingBox(for: digit, withFont: testFont)
+            let textSize = glyphBoundingBox(for: digit, withFont: testFont)
             
             if textSize.width <= size.width && textSize.height <= size.height {
                 low = mid
@@ -40,9 +47,60 @@ struct FontUtils {
             }
         }
         
-        // Apply more conservative sizing in full screen mode
-        let baseSize = low * fontName.percentageDownsize
-        return isDisplayMode ? baseSize * 0.95 : baseSize
+        // Apply minimal safety margin - removed excessive downsize factors
+        let finalSize = low * safetyMargin
+        
+        if debugLogging {
+            let testFont = createUIFont(name: fontName, weight: weight, design: design, size: finalSize)
+            let glyphSize = glyphBoundingBox(for: digit, withFont: testFont)
+            print("[FontUtils] target=\(Int(size.width))×\(Int(size.height)) glyph=\(Int(glyphSize.width))×\(Int(glyphSize.height)) fontSize=\(Int(finalSize))")
+        }
+        
+        return finalSize
+    }
+    
+    /// Get the fixed width for a single digit at the given font size
+    /// Uses "8" as the reference since it's typically the widest digit
+    static func digitWidth(
+        fontName: FontFamily,
+        weight: Font.Weight,
+        design: Font.Design,
+        fontSize: CGFloat
+    ) -> CGFloat {
+        let font = createUIFont(name: fontName, weight: weight, design: design, size: fontSize)
+        return glyphBoundingBox(for: "8", withFont: font).width
+    }
+    
+    /// Get the text size using typographic bounds that match SwiftUI rendering
+    private static func glyphBoundingBox(
+        for text: String,
+        withFont font: UIFont
+    ) -> CGSize {
+        // Get the glyph advances (actual width of each character)
+        let ctFont = font as CTFont
+        var glyphs = [CGGlyph](repeating: 0, count: text.count)
+        var characters = [UniChar](text.utf16)
+        CTFontGetGlyphsForCharacters(ctFont, &characters, &glyphs, text.count)
+        
+        var advances = [CGSize](repeating: .zero, count: glyphs.count)
+        CTFontGetAdvancesForGlyphs(ctFont, .horizontal, glyphs, &advances, glyphs.count)
+        
+        let totalWidth = advances.reduce(0) { $0 + $1.width }
+        
+        // Use ascender height for proper top clearance
+        // This matches what SwiftUI Text renders more closely
+        let ascender = font.ascender
+        let descender = abs(font.descender)
+        
+        // For digits, we don't have descenders, but SwiftUI still allocates space
+        // Use ascender + small fraction of descender for safety
+        let height = ascender + (descender * 0.3)
+        
+        if debugLogging {
+            print("[FontUtils] text='\(text)' width=\(Int(totalWidth)) ascender=\(Int(ascender)) height=\(Int(height))")
+        }
+        
+        return CGSize(width: ceil(totalWidth), height: ceil(height))
     }
     
     static func createFont(