diff --git a/src/AppContainer.tsx b/src/AppContainer.tsx
index 0274fd3..dc375bf 100644
--- a/src/AppContainer.tsx
+++ b/src/AppContainer.tsx
@@ -10,7 +10,7 @@ const AppContainer: Component<AppContainerProps> = (props) => {
         <div class="min-h-screen bg-gray-50/50">
             {/* Top Navigation Bar */}
             <header class="bg-white border-b border-gray-200 sticky top-0 z-10 no-print">
-                <div class="max-w-6xl mx-auto px-4 sm:px-6 lg:px-8">
+                <div class="max-w-[1800px] w-full mx-auto px-4 sm:px-6 lg:px-8">
                     <div class="flex justify-between h-16">
                         <div class="flex items-center gap-8">
                             <div class="flex-shrink-0 flex items-center">
@@ -39,7 +39,7 @@ const AppContainer: Component<AppContainerProps> = (props) => {
             </header>
 
             {/* Main Content Area */}
-            <main class="max-w-6xl mx-auto p-4 sm:p-6 lg:p-8">
+            <main class="max-w-[1800px] w-full mx-auto p-4 sm:p-6 lg:p-8">
                 {props.children}
             </main>
         </div>
diff --git a/src/components/EstimateBuilder.tsx b/src/components/EstimateBuilder.tsx
index bbf875b..033a388 100644
--- a/src/components/EstimateBuilder.tsx
+++ b/src/components/EstimateBuilder.tsx
@@ -212,7 +212,7 @@ const EstimateBuilder: Component<EstimateBuilderProps> = (props) => {
                         onAddScope={addScope}
                     />
 
-                    <main onClick={clearSelection} class="flex-1 p-8 bg-zinc-50/50 space-y-8 min-h-screen">
+                    <main onClick={clearSelection} class="flex-1 min-w-0 p-4 md:p-8 bg-zinc-50/50 space-y-8 min-h-screen">
                         <ProjectDetailsForm />
 
                         <div class="bg-muted/30 border border-border rounded-3xl p-6 mb-8">
diff --git a/src/components/ItemRow.tsx b/src/components/ItemRow.tsx
index 3345038..6a9b7d3 100644
--- a/src/components/ItemRow.tsx
+++ b/src/components/ItemRow.tsx
@@ -70,13 +70,13 @@ const ItemRow: Component<ItemRowProps> = (props) => {
                     e.stopPropagation();
                     props.onToggleSelection(props.item.id, e.metaKey || e.ctrlKey, e.shiftKey);
                 }}
-                class={`cursor-grab transition-colors shrink-0 w-4 mt-2 p-1 -m-1 rounded hover:bg-muted ${props.isSelected ? 'text-primary' : 'text-muted-foreground/30 hover:text-muted-foreground/60'}`}
+                class={`cursor-grab transition-colors shrink-0 w-4 mt-2 p-1 rounded hover:bg-muted ${props.isSelected ? 'text-primary' : 'text-muted-foreground/30 hover:text-muted-foreground/60'}`}
                 title="Drag to move or click to select"
             >
                 <GripVertical class="w-4 h-4" />
             </div>
 
-            <div class="flex-1 relative">
+            <div class="flex-1 relative min-w-[200px]">
 
                 <textarea
                     ref={descriptionRef}
diff --git a/src/components/ScopeCard.tsx b/src/components/ScopeCard.tsx
index 309ded0..fbf4fca 100644
--- a/src/components/ScopeCard.tsx
+++ b/src/components/ScopeCard.tsx
@@ -203,20 +203,22 @@ const ScopeCard: Component<ScopeCardProps> = (props) => {
                     onClick={(e) => { if (e.target === e.currentTarget) props.onClearSelection(); }}
                     class="p-6 space-y-4 relative"
                 >
-                    {/* Column Headers - Sticky, Square Top */}
-                    <div class="sticky top-header z-20 bg-background/95 backdrop-blur-sm border-b border-border py-2 mb-2 hidden md:flex items-center gap-4 text-[10px] font-bold text-muted-foreground uppercase tracking-wider px-3 rounded-none">
-                        <div class="w-4"></div> {/* Grip space */}
-                        <div class="flex-1">Description</div>
-                        <div class="w-20 text-right">Qty</div>
-                        <div class="w-24 text-right">Price</div>
-                        <div class="w-24 text-right">Subtotal</div>
-                        <Show when={props.isSidebarCollapsed() || !props.hideColumns}>
-                            <div class="w-32 text-center">Markup</div>
-                            <div class="w-32 text-center">Contingency</div>
-                        </Show>
-                        <div class="w-28 text-right px-2">Total</div>
-                        <div class="w-16"></div> {/* Action space */}
-                    </div>
+                    <div class="overflow-x-auto w-full pb-4 -mx-6 px-6">
+                        <div class="min-w-[768px]">
+                            {/* Column Headers - Sticky, Square Top */}
+                            <div class="sticky top-header z-20 bg-background/95 backdrop-blur-sm border-b border-border py-2 mb-2 hidden md:flex items-center gap-4 text-[10px] font-bold text-muted-foreground uppercase tracking-wider px-3 rounded-none">
+                                <div class="w-4 shrink-0"></div> {/* Grip space */}
+                                <div class="flex-1 min-w-[200px]">Description</div>
+                                <div class="w-20 shrink-0 text-right">Qty</div>
+                                <div class="w-24 shrink-0 text-right">Price</div>
+                                <div class="w-24 shrink-0 text-right">Subtotal</div>
+                                <Show when={props.isSidebarCollapsed() || !props.hideColumns}>
+                                    <div class="w-32 shrink-0 text-center">Markup</div>
+                                    <div class="w-32 shrink-0 text-center">Contingency</div>
+                                </Show>
+                                <div class="w-28 shrink-0 text-right">Total</div>
+                                <div class="w-16 shrink-0"></div> {/* Action space */}
+                            </div>
 
                     <div class="grid gap-2">
                         {/* Scope Level Items */}
@@ -244,6 +246,8 @@ const ScopeCard: Component<ScopeCardProps> = (props) => {
                             </div>
                         </Show>
                     </div>
+                        </div>
+                    </div>
 
                     {/* Sub-scopes */}
                     <div class="space-y-6 pt-4">
diff --git a/src/components/SubScopeCard.tsx b/src/components/SubScopeCard.tsx
index 7e61158..43a52e6 100644
--- a/src/components/SubScopeCard.tsx
+++ b/src/components/SubScopeCard.tsx
@@ -164,10 +164,12 @@ const SubScopeCard: Component<SubScopeCardProps> = (props) => {
             </div>
 
             <Show when={!isCollapsed()}>
-                <div
-                    onClick={(e) => { if (e.target === e.currentTarget) props.onClearSelection(); }}
-                    class="p-2 space-y-1.5"
-                >
+                <div class="overflow-x-auto w-full pb-2 -mx-2 px-2">
+                    <div class="min-w-[768px]">
+                        <div
+                            onClick={(e) => { if (e.target === e.currentTarget) props.onClearSelection(); }}
+                            class="p-2 space-y-1.5"
+                        >
                     <For each={props.items}>
                         {(item) => (
                             <LazyItem estimatedHeight={60}>
@@ -192,6 +194,8 @@ const SubScopeCard: Component<SubScopeCardProps> = (props) => {
                         </div>
                     </Show>
                 </div>
+                    </div>
+                </div>
             </Show>
         </div>
     );
diff --git a/src/components/estimate-builder/BuilderHeader.tsx b/src/components/estimate-builder/BuilderHeader.tsx
index d376003..e646ef3 100644
--- a/src/components/estimate-builder/BuilderHeader.tsx
+++ b/src/components/estimate-builder/BuilderHeader.tsx
@@ -18,7 +18,7 @@ export const BuilderHeader: Component<BuilderHeaderProps> = (props) => {
     const { scopes, estimateItems: items } = appStore;
 
     return (
-        <div class="h-16 px-6 border-b border-border bg-background/50 flex items-center justify-between sticky top-0 z-50 backdrop-blur-md">
+        <div class="min-h-[4rem] py-3 px-6 border-b border-border bg-background/50 flex flex-wrap gap-y-4 items-center justify-between sticky top-0 z-50 backdrop-blur-md">
             <div class="flex items-center gap-4">
                 <button
                     onClick={props.onToggleSidebar}
@@ -41,7 +41,7 @@ export const BuilderHeader: Component<BuilderHeaderProps> = (props) => {
                     </div>
                 </div>
             </div>
-            <div class="flex items-center gap-2">
+            <div class="flex flex-wrap items-center gap-2">
                 <button
                     onClick={props.onAddScope}
                     class="flex items-center gap-2 px-4 py-2 bg-foreground text-background rounded-xl text-sm font-bold hover:bg-foreground/90 transition-all shadow-lg shadow-foreground/10 mr-2"
diff --git a/src/components/estimate-builder/ProjectDetailsForm.tsx b/src/components/estimate-builder/ProjectDetailsForm.tsx
index a59302a..b0e2f62 100644
--- a/src/components/estimate-builder/ProjectDetailsForm.tsx
+++ b/src/components/estimate-builder/ProjectDetailsForm.tsx
@@ -6,7 +6,7 @@ export const ProjectDetailsForm: Component = () => {
     const { clientInfo, setClientInfo, jobInfo, setJobInfo } = appStore;
 
     return (
-        <div class="bg-card border border-border rounded-[2.5rem] p-8 shadow-premium transition-all">
+        <div class="bg-card border border-border rounded-[2.5rem] p-6 md:p-8 shadow-premium transition-all w-full max-w-full overflow-hidden">
             <div class="flex items-center gap-3 text-foreground mb-8">
                 <div class="p-2.5 bg-primary/10 text-primary rounded-2xl shadow-sm">
                     <FolderKanban class="w-5 h-5" />
@@ -14,15 +14,15 @@ export const ProjectDetailsForm: Component = () => {
                 <h3 class="font-black text-xl tracking-tight">Client & Project Details</h3>
             </div>
 
-            <div class="grid grid-cols-1 md:grid-cols-2 gap-x-12 gap-y-8">
+            <div class="grid grid-cols-1 md:grid-cols-2 gap-x-8 lg:gap-x-12 gap-y-8 w-full">
                 <div class="space-y-6">
                     <h4 class="text-[10px] font-black text-muted-foreground uppercase tracking-[0.2em] px-1 blur-[0.2px]">Client Information</h4>
                     <div class="grid gap-3">
                         <input type="text" value={clientInfo.name} onInput={(e) => setClientInfo('name', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Client Name" />
                         <input type="text" value={clientInfo.address} onInput={(e) => setClientInfo('address', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Client Address" />
-                        <div class="grid grid-cols-2 gap-3">
-                            <input type="text" value={clientInfo.phone} onInput={(e) => setClientInfo('phone', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Phone" />
-                            <input type="text" value={clientInfo.fax} onInput={(e) => setClientInfo('fax', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Fax" />
+                        <div class="flex flex-col sm:flex-row gap-3">
+                            <input type="text" value={clientInfo.phone} onInput={(e) => setClientInfo('phone', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium flex-1 min-w-0" placeholder="Phone" />
+                            <input type="text" value={clientInfo.fax} onInput={(e) => setClientInfo('fax', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium flex-1 min-w-0" placeholder="Fax" />
                         </div>
                     </div>
                 </div>
@@ -30,9 +30,9 @@ export const ProjectDetailsForm: Component = () => {
                 <div class="space-y-6">
                     <h4 class="text-[10px] font-black text-muted-foreground uppercase tracking-[0.2em] px-1 blur-[0.2px]">Project Information</h4>
                     <div class="grid gap-3">
-                        <div class="grid grid-cols-2 gap-3">
-                            <input type="text" value={jobInfo.number} onInput={(e) => setJobInfo('number', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Job Number" />
-                            <input type="text" value={jobInfo.name} onInput={(e) => setJobInfo('name', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Job Name" />
+                        <div class="flex flex-col sm:flex-row gap-3">
+                            <input type="text" value={jobInfo.number} onInput={(e) => setJobInfo('number', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium flex-1 min-w-0" placeholder="Job Number" />
+                            <input type="text" value={jobInfo.name} onInput={(e) => setJobInfo('name', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium flex-1 min-w-0" placeholder="Job Name" />
                         </div>
                         <input type="text" value={jobInfo.workOrder} onInput={(e) => setJobInfo('workOrder', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Work Order Number" />
                         <input type="text" value={jobInfo.address} onInput={(e) => setJobInfo('address', e.currentTarget.value)} class="bg-muted/20 border border-border/60 p-3 rounded-2xl text-sm outline-none focus:bg-background focus:ring-4 focus:ring-primary/10 focus:border-primary transition-all font-medium" placeholder="Job Site Address" />
diff --git a/src/components/estimate-builder/UnassignedItemsSection.tsx b/src/components/estimate-builder/UnassignedItemsSection.tsx
index 9fa6645..4180580 100644
--- a/src/components/estimate-builder/UnassignedItemsSection.tsx
+++ b/src/components/estimate-builder/UnassignedItemsSection.tsx
@@ -43,20 +43,22 @@ export const UnassignedItemsSection: Component<UnassignedItemsSectionProps> = (p
                         {props.unassignedItems.length} Items Pending
                     </span>
                 </div>
-                {/* Sticky Column Headers for Unassigned */}
-                <div class="sticky top-header z-10 bg-background/95 backdrop-blur-sm border-b border-border py-3 mb-4 hidden md:flex items-center gap-4 text-[10px] font-black text-muted-foreground/60 uppercase tracking-[0.2em] px-3">
-                    <div class="w-4"></div>
-                    <div class="flex-1">Description</div>
-                    <div class="w-20 text-right">Qty</div>
-                    <div class="w-24 text-right">Unit Price</div>
-                    <div class="w-24 text-right">Subtotal</div>
-                    <Show when={props.isSidebarCollapsed() || !props.anyDescriptionIsLong()}>
-                        <div class="w-32 text-center">Markup</div>
-                        <div class="w-32 text-center">Contingency</div>
-                    </Show>
-                    <div class="w-28 text-right px-2">Total</div>
-                    <div class="w-16"></div>
-                </div>
+                <div class="overflow-x-auto w-full pb-4 -mx-6 px-6">
+                    <div class="min-w-[768px]">
+                        {/* Sticky Column Headers for Unassigned */}
+                        <div class="sticky top-header z-10 bg-background/95 backdrop-blur-sm border-b border-border py-3 mb-4 hidden md:flex items-center gap-4 text-[10px] font-black text-muted-foreground/60 uppercase tracking-[0.2em] px-3">
+                            <div class="w-4 shrink-0"></div>
+                            <div class="flex-1 min-w-[200px]">Description</div>
+                            <div class="w-20 shrink-0 text-right">Qty</div>
+                            <div class="w-24 shrink-0 text-right">Unit Price</div>
+                            <div class="w-24 shrink-0 text-right">Subtotal</div>
+                            <Show when={props.isSidebarCollapsed() || !props.anyDescriptionIsLong()}>
+                                <div class="w-32 shrink-0 text-center">Markup</div>
+                                <div class="w-32 shrink-0 text-center">Contingency</div>
+                            </Show>
+                            <div class="w-28 shrink-0 text-right">Total</div>
+                            <div class="w-16 shrink-0"></div>
+                        </div>
 
                 <div class="grid gap-2">
                     <For each={props.unassignedItems}>
@@ -78,6 +80,8 @@ export const UnassignedItemsSection: Component<UnassignedItemsSectionProps> = (p
                         )}
                     </For>
                 </div>
+                    </div>
+                </div>
             </div>
         </Show>
     );