diff --git a/Forji/Forji/Views/InstanceFormView.swift b/Forji/Forji/Views/InstanceFormView.swift
index 1fdcebc..5d99253 100644
--- a/Forji/Forji/Views/InstanceFormView.swift
+++ b/Forji/Forji/Views/InstanceFormView.swift
@@ -144,19 +144,18 @@ struct InstanceFormView: View {
 
                 Section {
                     Button(action: handleSave) {
-                        HStack {
-                            Spacer()
+                        ZStack {
+                            Text(isAddMode ? "Login" : "Save")
+                                .fontWeight(.semibold)
+                                .opacity(isLoading ? 0 : 1)
                             if isLoading {
                                 ProgressView()
                                     .progressViewStyle(.circular)
-                            } else {
-                                Text(isAddMode ? "Login" : "Save")
-                                    .fontWeight(.semibold)
+                                    .tint(.white)
                             }
-                            Spacer()
                         }
                     }
-                    .buttonStyle(.borderedProminent)
+                    .buttonStyle(FlatPrimaryButtonStyle())
                     .disabled(
                         isLoading || serverURL.isEmpty
                             || (authMode == .credentials
@@ -330,6 +329,38 @@ struct InstanceFormView: View {
     }
 }
 
+/// A full-width primary button style with a large hit target.
+///
+/// Defines its own appearance instead of relying on `.borderedProminent`, whose built-in
+/// press treatment springs/scales on release — on iOS 26 that read as the button's lower
+/// edge "collapsing" when the finger lifted. This style changes only the background opacity
+/// on press, with no `scaleEffect` and no spring, so the frame never moves.
+private struct FlatPrimaryButtonStyle: ButtonStyle {
+    func makeBody(configuration: Configuration) -> some View {
+        Background(configuration: configuration)
+    }
+
+    private struct Background: View {
+        let configuration: ButtonStyleConfiguration
+        @Environment(\.isEnabled) private var isEnabled
+
+        var body: some View {
+            configuration.label
+                .font(.headline)
+                .foregroundStyle(.white)
+                .frame(maxWidth: .infinity)
+                .padding(.vertical, 14)
+                .background(Color.accentColor.opacity(backgroundOpacity), in: Capsule())
+                .contentShape(Capsule())
+        }
+
+        private var backgroundOpacity: Double {
+            if !isEnabled { return 0.35 }
+            return configuration.isPressed ? 0.85 : 1.0
+        }
+    }
+}
+
 #if DEBUG
     #Preview("Add") {
         InstanceFormView(authService: .previewDefault, mode: .add)