E Commerce Storefront

• Hero Clarity: Headline (6-10 words) explaining value prop in <5s.
• Primary CTA: Visible above-the-fold on all devices.
• Social Proof: Star ratings or "Trusted by X" immediately below hero heading.
• Load Time: Must load in <3s (target 1-2s for mobile).
• Sticky Nav: Keep primary navigation (with Cart/Search) visible at all times.

2. Product Listing Page / PLP (The Engine)

• Grid Consistency: 2 columns (mobile) / 3-4 columns (desktop).
• Essential Filters: Price, Rating, Color (swatches), Size, Brand. Sticky on mobile.
• Sidebar filters: Vertical sidebar on desktop for persistent visibility.
• Secondary View: Lifestyle or alternate image on hover (desktop).
• Quick Add: Small "Add" button/icon on product cards for fast-moving goods to bypass PDP when possible.
• Trust in Lists: Star ratings and review counts on every listing card.

3. Product Detail Page / PDP (The Surrogate Experience)

• Image Quantity: 4-6 high-res images (multiple angles, close-ups, lifestyle).
• Pinch-to-Zoom: Mobile interactive zoom; hover-zoom on desktop.
• No Dropdowns: Use buttons or tiles for size/color selection; never hide variants.
• Stock Urgency: Real-time levels (e.g., "Only 3 left") near purchase button.
• Delivery Clarity: Estimated delivery date (not speed) visible near CTA.
• Sticky CTA: Mini "Add to Cart" bar fixed at bottom on mobile scroll.
• Cross-Sells: "Complete the Look" or "Customers Also Bought" sections.

4. Shopping Cart (The Transition)

• Flyout/Mini-Cart: Side-cart to allow users to continue shopping without page reloads.
• Persistent Cart: Use cookies to ensure items remain if the user leaves.
• Easy Editing: Quantity changes/item removal in-view without reloads.
• Price Breakdown: Clear subtotal, taxes, and shipping (or free shipping threshold).
• One-Tap Checkout: Apple/Google Pay buttons at the top for mobile.

5. Checkout Flow (The Conversion Engine)

• Guest Checkout: Most prominent option; account creation occurs after purchase.
• Progress Indicator: Clear breadcrumbs (Shipping > Payment > Review).
• Distraction-Free: Remove main header/footer; focus 100% on the form.
• Minimalist Forms: <14 fields. Combine Name. Inline real-time validation.
• Transparency: Show all-in costs (tax/shipping) BEFORE the final payment step.

Phase 3: Global Design Rules

• 60-30-10 Rule: 60% neutral, 30% secondary, 10% accent (for CTAs).
• Trust Baseline: Use blue for core branding (trusted by 54% of consumers).
• Touch Targets: Min 44x44px with 8px spacing for mobile.
• Typography: 16px+ base, two-font hierarchy (Display for headings, Readable for body).
• Technical: WebP format, lazy loading below first fold.

Phase 4: Post-Purchase Loyalty

• Confirmation: Email within 60s with purchase images.
• Tracking: No-login tracking links in the "Thank You" page and email.
• Feedback Loop: Review request email 7-10 days after delivery.

Implementation Checklist

• Discovery: Locale, Currency, and Niche defined.
• Homepage: Sticky nav, above-fold CTA, star ratings.
• PLP: Grid with swatches and sticky filters.
• PDP: 4-6 images, no selection dropdowns, delivery dates.
• Cart: Side-flyout with easy quantity editing.
• Checkout: Guest checkout, distraction-free layout, <14 fields.
• Mobile: 44px touch targets, sticky purchase bar.
• Post-Purchase: Confirmation and tracking logic planned.