Mobile-First Web UI Redesign Agent

=== MOBILE-FIRST WEB UI REDESIGN ===

Project
UrbanNest Furniture Store

Product Type
Premium furniture and home-accessories e-commerce store

Primary Mobile Conversion
Configure a product, add it to the cart, and complete checkout.

=== EXECUTIVE SUMMARY ===

The current mobile experience is a compressed desktop store rather than a deliberately designed mobile purchasing journey.

The most important redesign priorities are:

1. Replace the crowded desktop header with a compact mobile header.
2. Promote search outside the navigation drawer.
3. Simplify the six-level mega menu into a drill-down mobile structure.
4. Move product identity, price, variants, delivery context, and Add to Cart earlier.
5. Replace unlabeled color swatches with accessible labeled selections.
6. Introduce a safe sticky purchase bar after the inline CTA leaves view.
7. Preserve filter state and applied-filter visibility.
8. Replace page-level horizontal comparison with a mobile comparison model.
9. Redesign checkout for virtual-keyboard safety.
10. Resolve conflicts between Add to Cart, chat, cookie, and browser controls.
11. Use responsive product media and reserve dimensions.
12. Convert oversized desktop modals into mobile-appropriate patterns.

=== PRIMARY MOBILE TASK ===

Primary User
Mobile shopper evaluating premium furniture

Primary Task
Review the product, select a material and color, understand delivery conditions, and add the configured product to the cart.

Entry Points

• Social advertisement
• Product search
• Category page
• Saved product
• Direct product link

Success
A valid product configuration is added to the cart.

Failure Risks

• Variant confusion
• Hidden delivery information
• Sticky-control collision
• Lost selections
• Unclear availability
• Form obstruction
• Slow media
• Horizontal overflow

=== CONTENT-PRIORITY MAP ===

Product Title
Priority 1 — Essential

Mobile Position
Above the primary product media or immediately after the first media frame, depending on final visual validation.

Price
Priority 1 — Essential

Mobile Position
Near the title and selected variant.

Variant Selection
Priority 1 — Essential

Mobile Position
Before Add to Cart.

Availability
Priority 1 — Essential

Delivery Information
Priority 1 — Essential

Primary CTA
Priority 1 — Essential

Product Dimensions
Priority 2 — Supporting

Mobile Position
Expandable details available before the lower marketing content.

Materials and Care
Priority 2 — Supporting

Reviews
Priority 2 — Supporting

Brand Story
Priority 3 — Optional

Related Products
Priority 3 — Optional

Newsletter
Priority 4 — Deferred

Decorative Editorial Content
Priority 4 — Deferred or reduced

Repeated Benefit Blocks
Priority 5 — Remove when duplicative

=== BREAKPOINT STRATEGY ===

Small Mobile
0–479 pixels

Standard Mobile
480–767 pixels

Tablet
768–1023 pixels

Desktop
1024–1439 pixels

Wide
1440 pixels and above

Validation Rule
Final breakpoints should be adjusted according to navigation pressure, product-card minimum width, form behavior, product-media layout, and content expansion.

=== MOBILE HEADER ===

Structure

• Menu trigger
• Centered or left-aligned logo
• Search
• Cart

Optional
Account access inside the navigation drawer unless usage data supports direct header access.

Height
Compact enough to preserve viewport space.

Sticky Behavior

• Sticky after initial scroll
• Reduced height in the scrolled state
• Border rather than a heavy shadow
• Correct anchor offset
• Safe-area support
• No content overlap

Accessible Names

• Open Menu
• Search
• View Cart

Cart Badge
Expose the cart quantity programmatically.

=== MOBILE NAVIGATION ===

Navigation Type
Accessible drill-down drawer

Level 1:

• New
• Furniture
• Rooms
• Collections
• Inspiration
• Sale
• Support

Level 2 Example:
Furniture

• Seating
• Tables
• Storage
• Beds
• Lighting
• Accessories

Behavior

• Dedicated back action
• Visible current category
• Internal scrolling
• Persistent close action
• Background interaction prevented
• Focus moves into the drawer
• Focus returns to the menu trigger after closing
• Escape supported where appropriate

Search
Placed in the header and repeated at the top of the drawer.

Avoid
Displaying all six navigation levels simultaneously.

=== MOBILE PRODUCT-PAGE ORDER ===

1. Breadcrumb or compact category context
2. Product title
3. Rating and review link
4. Product media
5. Price
6. Financing context when verified
7. Variant selection
8. Availability
9. Delivery or pickup information
10. Inline Add to Cart
11. Returns and trust summary
12. Product overview
13. Dimensions
14. Materials and care
15. Reviews
16. Related products
17. Editorial brand content

=== PRODUCT MEDIA ===

Mobile Pattern
Full-width media gallery

Controls

• Swipe
• Visible Previous button
• Visible Next button
• Image counter
• Thumbnail or compact selector
• Full-screen image view
• Zoom controls

Critical Rule
Swipe must not be the only navigation method.

Responsive Images

• Load mobile-appropriate sources
• Preserve intrinsic dimensions
• Use art direction where needed
• Avoid loading all high-resolution desktop assets immediately
• Lazy-load noninitial media

Alternative Text
Describe meaningful product and variant information.

Variant Synchronization
Selecting a material or color should update the relevant media without resetting the user's scroll position.

=== VARIANT SELECTOR ===

Material Selector
Labeled options with material name and optional texture preview.

Color Selector
Visual swatch plus visible or programmatically associated color name.

Selected State

• Strong border
• Check indicator
• Text label
• Programmatic selected state

Unavailable State

• Visible Unavailable label
• Explanation where needed
• Not communicated through low opacity alone

Price Change
Update price without causing layout shift.

Image Change
Update product media while preserving context.

Validation Error
Choose a material and color before adding this product to the cart.

=== INLINE ADD-TO-CART AREA ===

Include

• Selected material
• Selected color
• Quantity
• Price
• Availability
• Primary Add to Cart CTA

Primary CTA
Add to Cart

Secondary Action
Save to Wishlist

Requirements

• Full-width primary button
• Clear disabled reason
• Loading state
• Success state
• Error recovery
• Duplicate-submission prevention
• Focus remains understandable after state changes

=== STICKY PURCHASE BAR ===

Visible When
The inline Add to Cart section has scrolled outside the viewport and a valid product context exists.

Contents

• Compact product or selected-variant summary
• Price
• Add to Cart

Optional
Variant reminder when a required choice is missing.

Hidden or Adapted When

• Virtual keyboard is open
• Modal is active
• Cart drawer is active
• Cookie controls conflict
• Checkout begins

Layout
Reserve bottom space equal to the bar height.

Safe Area
Include device bottom safe-area inset.

Chat Conflict
Suppress or reposition the chat widget while the sticky purchase bar is active.

Acceptance
The bar must not cover content, errors, form fields, footer controls, or browser zoom content.

=== CATEGORY PAGE ===

Header

• Category title
• Short description
• Result count

Controls

• Filter
• Sort

Applied Filters
Visible chips beneath the controls.

Product Grid
Two columns on standard mobile when product content remains readable.
One column on very narrow screens or for editorial products.

Product Card

• Image
• Product name
• Price
• Color count
• Availability
• Wishlist
• Optional verified badge

Avoid
Excessive card metadata and hidden product names.

=== FILTER SYSTEM ===

Pattern
Full-screen mobile filter view

Trigger
Filters — 3 Applied

Sections

• Category
• Price
• Material
• Color
• Style
• Room
• Availability
• Delivery Time
• Rating

Behavior

• Preserve selections
• Show selected count
• Show estimated result count when technically supported
• Keep Apply and Clear actions reachable
• Support internal scrolling
• Restore focus to the trigger
• Preserve product-list scroll context

Primary CTA
Show Verified Result Count

Secondary Action
Clear All

Live Update
Use only when performance and user understanding remain acceptable.

=== SORTING ===

Pattern
Accessible bottom sheet or compact select

Options

• Recommended
• Price: Low to High
• Price: High to Low
• Newest
• Rating

Recommendation Logic
Do not use Recommended unless the sorting logic is defined and approved.

=== PRODUCT COMPARISON ===

Desktop
Full comparison table

Mobile Strategy
Selected-product comparison

Behavior

• Select two or three products
• Show one feature group at a time
• Keep product names visible
• Allow product switching
• Provide Previous and Next controls
• Preserve complete specifications
• Provide contained horizontal comparison only where relationships require it

Groups

• Dimensions
• Materials
• Availability
• Delivery
• Care
• Warranty when verified
• Price

Avoid
Page-level horizontal scrolling.

=== CART REDESIGN ===

Cart Item

• Product image
• Product name
• Selected variant
• Delivery estimate when verified
• Quantity
• Price
• Remove
• Save for Later

Quantity Controls
Large touch targets with accessible labels.

Order Summary

• Subtotal
• Discounts
• Shipping
• Taxes where verified
• Total

Primary CTA
Proceed to Checkout

Sticky Behavior
Use carefully and reserve space.

Error State
Explain inventory or price changes without deleting the item.

=== CHECKOUT REDESIGN ===

Recommended Structure
Clear sequential sections or a validated step flow.

Sections

1. Contact
2. Delivery Address
3. Delivery Method
4. Payment
5. Review

Form Rules

• Persistent labels
• Correct autocomplete
• Correct keyboard types
• Data preservation
• Inline errors
• Error summary
• Billing and shipping logic
• No hidden charges
• Review before final confirmation

Virtual Keyboard

• Scroll the focused field above the keyboard
• Keep errors visible
• Adapt sticky order summary
• Keep the payment action reachable
• Avoid fixed elements covering the final fields

Order Summary
Expandable but always provide access to the total.

=== MODAL TRANSFORMATIONS ===

Newsletter Modal
Convert to an inline section, compact bottom sheet, or delayed mobile prompt.

Do not show during checkout or active form completion.

Image Zoom
Full-screen media view.

Size Guide
Full-screen dialog or dedicated page with internal navigation.

Material Information
Bottom sheet for concise content or dedicated page for complex information.

Cart Confirmation
Compact drawer or inline confirmation that preserves product-page context.

=== FORM ARCHITECTURE ===

Required

• Persistent labels
• One-column flow
• Logical field order
• Appropriate input types
• Autocomplete
• Values preserved
• Clear required status
• Inline errors
• Error summary for long forms
• Save and resume where relevant
• Reachable submit action

Avoid

• Placeholder-only labels
• Tiny helper text
• Side-by-side address fields on narrow screens
• Clearing fields after failure
• Error messages only at the top

=== TOUCH REQUIREMENTS ===

• Reliable control sizes
• Adequate spacing
• Clear selected states
• Destructive actions separated from primary actions
• No hover-only information
• Non-gesture alternatives
• Visible carousel controls
• Accessible overflow menus
• No tiny quantity or close controls

=== ACCESSIBILITY REQUIREMENTS ===

• Semantic page structure
• Logical heading hierarchy
• Accessible navigation drawer
• Visible focus
• Keyboard support
• Logical DOM order
• Accessible variant names
• Non-color availability states
• Labeled filter controls
• Filter focus restoration
• Dialog focus management
• Sufficient contrast
• Browser zoom
• Responsive reflow
• Text enlargement
• Reduced motion
• Product-image alternative text
• Touch-target review
• Error summaries
• Sticky-element collision testing
• Virtual-keyboard testing

=== PERFORMANCE REQUIREMENTS ===

Images

• Responsive sources
• Mobile dimensions
• Proper compression
• Reserved aspect ratios
• Lazy-loaded secondary images

JavaScript

• Reduce noncritical scripts
• Review chat, reviews, wishlist, and advertising integrations
• Avoid heavy carousel libraries
• Defer noncritical widgets

Fonts

• Limit families and weights
• Use appropriate loading behavior

Layout

• Reserve product-media dimensions
• Reserve sticky-bar space
• Prevent late price or CTA shifts

Mobile

• Do not load hidden desktop navigation or full desktop media unnecessarily
• Test slow connections
• Keep essential content and Add to Cart available early

=== CONTENT STRESS TESTS ===

Test

• Long German product names
• Long variant labels
• Multiple delivery messages
• Sale price and original price
• Missing image
• Unavailable variant
• Twelve selected filters
• No search results
• Long checkout error
• 200% zoom
• 320-pixel viewport
• Landscape mobile
• Short viewport height
• Virtual keyboard
• Slow product-media loading

=== ANALYTICS EVENT MAP ===

Event
mobile_menu_opened

Properties

• entry_page
• device_width_bucket

Event
mobile_search_started

Properties

• entry_page
• acquisition_source

Event
filter_opened

Properties

• category
• current_result_count

Event
filter_applied

Properties

• filter_count
• result_count_bucket
• category

Event
product_variant_selected

Properties

• product_id
• variant_type
• availability_state

Event
sticky_add_to_cart_viewed

Properties

• product_id
• selected_variant_state

Event
sticky_add_to_cart_clicked

Properties

• product_id
• selected_variant_state
• scroll_depth_bucket

Event
checkout_started

Properties

• cart_size_bucket
• device_type

Privacy
Do not include names, addresses, payment information, private order details, email addresses, or sensitive customer data in analytics properties.

=== EXPERIMENT ROADMAP ===

Experiment 1:
Sticky Add to Cart

Observation
The inline CTA appears after substantial product content.

Hypothesis
A safe sticky purchase bar shown after the inline CTA leaves view will improve valid Add to Cart completion.

Primary Metric
Mobile Add to Cart rate

Guardrails
Variant-selection errors
Accidental cart additions
Page obstruction complaints

Experiment 2:
Search Placement

Hypothesis
Keeping search visible in the mobile header will improve product discovery compared with menu-only search.

Primary Metric
Search-to-product-view rate

Experiment 3:
Filter Experience

Hypothesis
A full-screen filter view with applied counts will improve filter completion and product discovery.

Primary Metric
Filtered product-view rate

Guardrail
Filter abandonment

Experiment 4:
Checkout Keyboard Safety

Hypothesis
Adapting sticky controls while the keyboard is active will reduce checkout form abandonment.

Primary Metric
Mobile checkout completion

=== DEVELOPER HANDOFF ===

Required Components

• MobileHeader
• NavigationDrawer
• MobileSearch
• ProductGallery
• VariantSelector
• ProductPrice
• DeliverySummary
• AddToCart
• StickyPurchaseBar
• ProductCard
• FilterTrigger
• FilterView
• AppliedFilterChip
• SortControl
• MobileComparison
• CartItem
• CheckoutForm
• ErrorSummary
• MobileDialog
• BottomSheet

Implementation Rules

• Use semantic DOM order.
• Preserve filter and form state.
• Reserve sticky-bar space.
• Adapt sticky controls to the virtual keyboard.
• Avoid page-level horizontal scrolling.
• Provide gesture alternatives.
• Load mobile-appropriate media.
• Keep labels visible.
• Maintain accessible focus behavior.
• Verify all commerce rules before publication.

=== IMPLEMENTATION SEQUENCE ===

1. Confirm primary mobile tasks and conversion path.
2. Rebuild mobile header and navigation.
3. Implement search.
4. Reorder product-page content.
5. Implement accessible product media.
6. Implement variant selection.
7. Implement inline and sticky Add to Cart.
8. Implement category filters and sorting.
9. Implement mobile comparison.
10. Redesign cart.
11. Redesign checkout.
12. Replace desktop modals.
13. Implement accessibility.
14. Optimize performance.
15. Add analytics.
16. Complete device and browser QA.
17. Launch prioritized experiments.

=== ACCEPTANCE CRITERIA ===

Navigation

Given a keyboard or assistive-technology user opens the mobile navigation,
when the drawer appears,
then focus moves into the drawer, background content is unavailable, navigation is understandable, and focus returns to the menu trigger after closing.

Variant Selection

Given a product requires material and color selection,
when a mobile user chooses both options,
then the selected states, availability, price, media, and Add to Cart readiness update without losing scroll context.

Sticky Purchase Bar

Given the inline Add to Cart leaves the viewport,
when the sticky purchase bar appears,
then it displays the current price and action, reserves layout space, respects safe areas, and does not cover content.

Filter Persistence

Given a user selects three filters,
when the filter view closes and results update,
then the selections remain visible, the applied count is correct, and the user's list context remains understandable.

Checkout Keyboard

Given the virtual keyboard opens on the final checkout field,
when the user enters payment or address information,
then the field, validation message, and required action remain visible and reachable.

Responsive Media

Given the page loads on a standard mobile connection,
when the initial product view renders,
then the primary image uses an appropriate responsive source, dimensions remain reserved, and secondary media does not delay the primary task unnecessarily.

=== REGRESSION TEST MATRIX ===

Viewport Conditions

• 320-pixel mobile
• 390-pixel mobile
• Large mobile
• Tablet portrait
• Tablet landscape
• Desktop
• 200% zoom
• Landscape mobile
• Short-height mobile

Navigation States

• Closed
• Open
• Deep navigation
• Search active
• Long labels
• Cart badge

Product States

• Default
• Sale
• Unavailable
• Variant unavailable
• Long title
• Missing image
• Multiple prices
• Loading

Filter States

• No filters
• One filter
• Many filters
• No results
• Network failure

Checkout States

• Empty cart
• Guest checkout
• Signed-in checkout
• Address error
• Payment error
• Inventory change
• Price change
• Keyboard active

Accessibility Conditions

• Keyboard
• Screen reader
• Reduced motion
• Zoom
• Text enlargement
• High contrast where supported

=== QA CHECKLIST ===

Navigation

• Verify menu opening.
• Verify drill-down levels.
• Verify focus.
• Verify scrolling.
• Verify closing.
• Verify search.
• Verify cart badge.

Product Page

• Verify title.
• Verify images.
• Verify controls.
• Verify variants.
• Verify price.
• Verify availability.
• Verify delivery.
• Verify Add to Cart.
• Verify sticky bar.

Category

• Verify product cards.
• Verify filters.
• Verify sorting.
• Verify applied chips.
• Verify no-results state.

Cart

• Verify quantities.
• Verify variants.
• Verify removal.
• Verify totals.
• Verify inventory changes.

Checkout

• Verify autocomplete.
• Verify keyboard types.
• Verify errors.
• Verify payment.
• Verify review.
• Verify virtual keyboard.
• Verify total.

Responsive

• Verify all target widths.
• Verify orientation.
• Verify zoom.
• Verify long content.
• Verify safe areas.
• Verify no horizontal page scrolling.

Accessibility

• Verify labels.
• Verify focus.
• Verify reading order.
• Verify touch targets.
• Verify dialogs.
• Verify error summaries.
• Verify gesture alternatives.

Performance

• Verify image sizes.
• Verify layout stability.
• Verify font loading.
• Verify script cost.
• Verify slow network.
• Verify interaction responsiveness.

=== RISKS ===

Risk
Sticky controls collide with chat, cookies, or browser UI.

Mitigation
Define component priority, reserve space, and suppress lower-priority controls during purchase tasks.

Risk
Visual reordering conflicts with DOM order.

Mitigation
Update semantic document order rather than relying on CSS order alone.

Risk
Filter redesign loses selections.

Mitigation
Use persistent filter state and test reopening, applying, clearing, and browser navigation.

Risk
Product media remains too heavy.

Mitigation
Use responsive sources, loading priorities, reserved dimensions, and mobile asset budgets.

Risk
Mobile checkout errors remain difficult to discover.

Mitigation
Use inline errors, an error summary, focus management, and keyboard-safe scrolling.

=== KNOWN LIMITATIONS ===

• Checkout and payment behavior require live testing.
• Shipping, availability, returns, and pricing require verification.
• Accessibility requires implementation testing.
• Mobile-browser behavior requires real-device validation.
• Performance requires measured validation.
• Analytics must be implemented and verified.
• Experiment conclusions require sufficient evidence.
• The redesign does not guarantee higher conversion, revenue, engagement, or retention.

=== FINAL PROFESSIONAL NOTE ===

All business rules, prices, claims, analytics, support promises, payment behavior, shipping terms, account permissions, browser support, device support, and conversion statements must be verified before publication.

The redesign is intended to improve mobile clarity, usability, accessibility, and conversion readiness. It does not guarantee higher conversion, engagement, revenue, retention, or search performance.