809 lines
27 KiB
Markdown
809 lines
27 KiB
Markdown
╔══════════════════════════════════════════════════════════════════╗
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║ SHOP FRONTEND ARCHITECTURE OVERVIEW ║
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║ Alpine.js + Jinja2 + Tailwind CSS + Multi-Theme ║
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╚══════════════════════════════════════════════════════════════════╝
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📦 WHAT IS THIS?
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═════════════════════════════════════════════════════════════════
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Customer-facing shop frontend provides visitors with a branded
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e-commerce experience unique to each vendor. Built with:
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✅ Jinja2 Templates (server-side rendering)
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✅ Alpine.js (client-side reactivity)
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✅ Tailwind CSS (utility-first styling)
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✅ Multi-Theme System (vendor branding)
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✅ FastAPI (backend routes)
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🎯 KEY PRINCIPLES
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═════════════════════════════════════════════════════════════════
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1. Theme-First Design
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• Each vendor has unique colors, fonts, logos
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• CSS variables for dynamic theming
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• Custom CSS support per vendor
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• Dark mode with vendor colors
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2. Progressive Enhancement
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• Works without JavaScript (basic HTML)
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• JavaScript adds cart, search, filters
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• Graceful degradation for older browsers
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3. API-First Data Loading
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• All products from REST APIs
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• Client-side cart management
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• Real-time stock updates
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• Search and filtering
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4. Responsive & Mobile-First
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• Mobile-first Tailwind approach
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• Touch-friendly interactions
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• Optimized images
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• Fast page loads
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📁 FILE STRUCTURE
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═════════════════════════════════════════════════════════════════
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app/
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├── templates/shop/
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│ ├── base.html ← Base template (layout)
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│ ├── home.html ← Homepage / product grid
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│ ├── product-detail.html ← Single product page
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│ ├── cart.html ← Shopping cart
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│ ├── checkout.html ← Checkout flow
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│ ├── search.html ← Search results
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│ ├── category.html ← Category browse
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│ ├── about.html ← About the shop
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│ ├── contact.html ← Contact form
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│ └── partials/ ← Reusable components
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│ ├── product-card.html ← Product display card
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│ ├── cart-item.html ← Cart item row
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│ ├── search-modal.html ← Search overlay
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│ └── filters.html ← Product filters
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│
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├── static/shop/
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│ ├── css/
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│ │ ├── shop.css ← Shop-specific styles
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│ │ └── themes/ ← Optional theme stylesheets
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│ │ ├── modern.css
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│ │ ├── minimal.css
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│ │ └── elegant.css
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│ ├── js/
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│ │ ├── shop-layout.js ← Base shop functionality
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│ │ ├── home.js ← Homepage logic
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│ │ ├── product-detail.js ← Product page logic
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│ │ ├── cart.js ← Cart management
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│ │ ├── checkout.js ← Checkout flow
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│ │ ├── search.js ← Search functionality
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│ │ └── filters.js ← Product filtering
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│ └── img/
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│ ├── placeholder-product.png
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│ └── empty-cart.svg
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│
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├── static/shared/ ← Shared across all areas
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│ ├── js/
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│ │ ├── log-config.js ← Logging setup
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│ │ ├── icons.js ← Icon registry
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│ │ ├── utils.js ← Utility functions
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│ │ └── api-client.js ← API wrapper
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│ └── css/
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│ └── base.css ← Global styles
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│
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└── api/v1/shop/
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└── pages.py ← Route handlers
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🏗️ ARCHITECTURE LAYERS
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═════════════════════════════════════════════════════════════════
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Layer 1: Routes (FastAPI)
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↓
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Layer 2: Middleware (Vendor + Theme Detection)
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↓
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Layer 3: Templates (Jinja2)
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↓
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Layer 4: JavaScript (Alpine.js)
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↓
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Layer 5: API (REST endpoints)
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↓
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Layer 6: Database
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Layer 1: ROUTES (FastAPI)
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──────────────────────────────────────────────────────────────────
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Purpose: Vendor Detection + Template Rendering
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Location: app/api/v1/shop/pages.py
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Example:
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@router.get("/")
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async def shop_home(
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request: Request,
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db: Session = Depends(get_db)
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):
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vendor = request.state.vendor # From middleware
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theme = request.state.theme # From middleware
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return templates.TemplateResponse(
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"shop/home.html",
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{
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"request": request,
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"vendor": vendor,
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"theme": theme,
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}
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)
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Responsibilities:
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✅ Access vendor from middleware
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✅ Access theme from middleware
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✅ Render template
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❌ NO database queries (data loaded client-side)
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❌ NO business logic
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Layer 2: MIDDLEWARE
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──────────────────────────────────────────────────────────────────
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Purpose: Vendor & Theme Identification
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Two middleware components work together:
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1. Vendor Context Middleware
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• Detects vendor from domain/subdomain
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• Sets request.state.vendor
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• Returns 404 if vendor not found
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2. Theme Context Middleware
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• Loads theme for detected vendor
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• Sets request.state.theme
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• Falls back to default theme
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Order matters:
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vendor_context_middleware → theme_context_middleware
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Layer 3: TEMPLATES (Jinja2)
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──────────────────────────────────────────────────────────────────
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Purpose: HTML Structure + Vendor Branding
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Location: app/templates/shop/
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Template Hierarchy:
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base.html (layout + theme injection)
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↓
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home.html (product grid)
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↓
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partials/product-card.html (components)
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Example:
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{% extends "shop/base.html" %}
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{% block title %}{{ vendor.name }}{% endblock %}
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{% block alpine_data %}shopHome(){% endblock %}
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{% block content %}
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<div x-show="loading">Loading products...</div>
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<div x-show="!loading" class="grid grid-cols-1 md:grid-cols-4 gap-6">
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<template x-for="product in products" :key="product.id">
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<!-- Product card -->
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</template>
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</div>
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{% endblock %}
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Key Features:
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✅ Theme CSS variables injection
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✅ Vendor logo (light/dark mode)
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✅ Custom CSS from theme
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✅ Social links from theme
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✅ Dynamic favicon
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Layer 4: JAVASCRIPT (Alpine.js)
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──────────────────────────────────────────────────────────────────
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Purpose: Client-Side Interactivity + Cart + Search
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Location: app/static/shop/js/
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Example (shop-layout.js):
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function shopLayoutData() {
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return {
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dark: false,
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cartCount: 0,
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cart: [],
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init() {
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this.loadCart();
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this.loadThemePreference();
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},
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addToCart(product, quantity) {
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// Add to cart logic
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this.cart.push({ ...product, quantity });
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this.saveCart();
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},
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toggleTheme() {
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this.dark = !this.dark;
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localStorage.setItem('shop-theme',
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this.dark ? 'dark' : 'light');
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}
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};
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}
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Responsibilities:
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✅ Load products from API
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✅ Manage cart in localStorage
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✅ Handle search and filters
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✅ Update DOM reactively
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✅ Theme toggling
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Layer 5: API (REST)
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──────────────────────────────────────────────────────────────────
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Purpose: Product Data + Cart + Orders
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Location: app/api/v1/shop/*.py (not pages.py)
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Example Endpoints:
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GET /api/v1/shop/{vendor_code}/products
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GET /api/v1/shop/{vendor_code}/products/{id}
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GET /api/v1/shop/{vendor_code}/categories
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POST /api/v1/shop/{vendor_code}/search
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POST /api/v1/shop/{vendor_code}/cart/checkout
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🔄 DATA FLOW
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═════════════════════════════════════════════════════════════════
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Page Load Flow:
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──────────────────────────────────────────────────────────────────
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1. Customer → visits acme-shop.com
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2. Vendor Middleware → Identifies "ACME" vendor
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3. Theme Middleware → Loads ACME's theme config
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4. FastAPI → Renders shop/home.html
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5. Browser → Receives HTML with theme CSS variables
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6. Alpine.js → init() executes
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7. JavaScript → GET /api/v1/shop/ACME/products
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8. API → Returns product list JSON
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9. Alpine.js → Updates products array
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10. Browser → DOM updates with product cards
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Add to Cart Flow:
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──────────────────────────────────────────────────────────────────
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1. Customer → Clicks "Add to Cart"
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2. Alpine.js → addToCart(product, quantity)
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3. Alpine.js → Updates cart array
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4. Alpine.js → Saves to localStorage
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5. Alpine.js → Updates cartCount badge
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6. Alpine.js → Shows toast notification
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7. Browser → Cart icon updates automatically
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Checkout Flow:
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──────────────────────────────────────────────────────────────────
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1. Customer → Goes to /cart
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2. Page → Loads cart from localStorage
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3. Customer → Fills checkout form
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4. Alpine.js → POST /api/v1/shop/ACME/cart/checkout
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5. API → Creates order + payment intent
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6. Alpine.js → Redirects to payment
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7. Payment → Completes
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8. Redirect → /order/{order_id}/confirmation
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🎨 MULTI-THEME SYSTEM
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═════════════════════════════════════════════════════════════════
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How Themes Work:
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1. Database Storage
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• Each vendor has a theme record
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• Stores colors, fonts, logos, layout prefs
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• Custom CSS per vendor
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2. CSS Variables Injection
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• base.html injects variables in <style> tag
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• Variables available throughout page
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• Example:
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:root {
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--color-primary: #6366f1;
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--color-secondary: #8b5cf6;
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--color-accent: #ec4899;
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--color-background: #ffffff;
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--color-text: #1f2937;
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--font-heading: Inter, sans-serif;
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--font-body: Inter, sans-serif;
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}
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3. Usage in Templates
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<button style="background-color: var(--color-primary)">
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Buy Now
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</button>
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4. Dark Mode
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• Vendor colors adjust for dark mode
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• Saved in localStorage
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• Applied via :class="{ 'dark': dark }"
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• Uses dark: variants in Tailwind
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Theme Configuration Example:
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──────────────────────────────────────────────────────────────────
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{
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"theme_name": "modern",
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"colors": {
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"primary": "#6366f1",
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"secondary": "#8b5cf6",
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"accent": "#ec4899",
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"background": "#ffffff",
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"text": "#1f2937"
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},
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"fonts": {
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"heading": "Inter, sans-serif",
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"body": "Inter, sans-serif"
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},
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"branding": {
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"logo": "/media/vendors/acme/logo.png",
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"logo_dark": "/media/vendors/acme/logo-dark.png",
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"favicon": "/media/vendors/acme/favicon.ico"
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},
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"layout": {
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"header": "fixed",
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"style": "grid"
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},
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"social_links": {
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"facebook": "https://facebook.com/acme",
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"instagram": "https://instagram.com/acme"
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},
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"custom_css": ".product-card { border-radius: 12px; }"
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}
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🛒 CART SYSTEM
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═════════════════════════════════════════════════════════════════
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Client-Side Cart Management:
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Storage: localStorage
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Format: JSON array of cart items
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Cart Item Structure:
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{
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"id": "product-123",
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"name": "Product Name",
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"price": 29.99,
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"quantity": 2,
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"image": "/media/products/image.jpg",
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"vendor_code": "ACME"
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}
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Key Functions:
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• loadCart(): Load from localStorage
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• saveCart(): Persist to localStorage
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• addToCart(product, quantity): Add item
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• updateCartItem(id, quantity): Update quantity
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• removeFromCart(id): Remove item
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• clearCart(): Empty cart
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• cartTotal: Computed total price
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Cart Persistence:
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• Survives page refresh
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• Shared across shop pages
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• Cleared on checkout completion
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• Synced across tabs (optional)
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🔍 SEARCH & FILTERS
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═════════════════════════════════════════════════════════════════
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Search System:
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1. Search Modal
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• Overlay with input
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• Live search as you type
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• Keyboard shortcuts (Cmd+K)
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2. Search API
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POST /api/v1/shop/{vendor_code}/search
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{
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"query": "laptop",
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"category": "electronics",
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"min_price": 100,
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"max_price": 1000,
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"sort": "price:asc"
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}
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3. Client-Side Filtering
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• Filter products array
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• No API call needed for basic filters
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• Use for in-memory datasets
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Filter Components:
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• Category dropdown
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• Price range slider
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• Sort options
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• Availability toggle
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• Brand checkboxes
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📱 RESPONSIVE DESIGN
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═════════════════════════════════════════════════════════════════
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Breakpoints (Tailwind):
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• sm: 640px (mobile landscape)
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• md: 768px (tablet)
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• lg: 1024px (desktop)
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• xl: 1280px (large desktop)
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Product Grid Responsive:
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• Mobile: 1 column
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• Tablet: 2 columns
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• Desktop: 4 columns
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Example:
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<div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
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<!-- Product cards -->
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</div>
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Touch Optimization:
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• Larger touch targets (min 44x44px)
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• Swipeable carousels
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• Touch-friendly buttons
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• Tap to zoom images
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🌙 DARK MODE
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═════════════════════════════════════════════════════════════════
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Implementation:
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1. Alpine.js state: dark: boolean
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2. HTML class binding: :class="{ 'dark': dark }"
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3. Tailwind variants: dark:bg-gray-800
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4. LocalStorage persistence
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5. Vendor colors adapt to dark mode
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Toggle Button:
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<button @click="toggleTheme()">
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<svg x-show="!dark"><!-- Sun icon --></svg>
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<svg x-show="dark"><!-- Moon icon --></svg>
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</button>
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Dark Mode Colors:
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• Background: dark:bg-gray-900
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• Text: dark:text-gray-100
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• Borders: dark:border-gray-700
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• Cards: dark:bg-gray-800
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Vendor Colors:
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• Primary color adjusts brightness
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• Maintains brand identity
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• Readable in both modes
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🔐 CUSTOMER AUTHENTICATION
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═════════════════════════════════════════════════════════════════
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Optional Auth System:
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Guest Checkout:
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✅ No account required
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✅ Email for order updates
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✅ Quick checkout
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Account Features:
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✅ Order history
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✅ Saved addresses
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✅ Wishlist
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✅ Profile management
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Auth Flow:
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1. Login/Register → POST /api/v1/shop/auth/login
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2. API → Return JWT token
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3. JavaScript → Store in localStorage
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4. API Client → Add to authenticated requests
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5. Optional → Use account features
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📡 API CLIENT
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═════════════════════════════════════════════════════════════════
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Location: app/static/shared/js/api-client.js
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Usage:
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const products = await apiClient.get(
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`/api/v1/shop/${vendorCode}/products`
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);
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const order = await apiClient.post(
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`/api/v1/shop/${vendorCode}/checkout`,
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orderData
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);
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Features:
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✅ Automatic error handling
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✅ JSON parsing
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✅ Loading states
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✅ Auth token injection (if logged in)
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🐛 LOGGING
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═════════════════════════════════════════════════════════════════
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Location: app/static/shared/js/log-config.js
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Shop-Specific Logging:
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shopLog.info('Product added to cart', product);
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shopLog.error('Checkout failed', error);
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shopLog.debug('Search query', { query, results });
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Levels:
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• INFO: User actions
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• ERROR: Failures and exceptions
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• DEBUG: Development debugging
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• WARN: Warnings
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🎭 ICONS
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═════════════════════════════════════════════════════════════════
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Location: app/static/shared/js/icons.js
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Usage:
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<span x-html="$icon('shopping-cart', 'w-5 h-5')"></span>
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<span x-html="$icon('search', 'w-6 h-6 text-primary')"></span>
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Shop Icons:
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• shopping-cart, shopping-bag
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• heart (wishlist)
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• search, filter
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• eye (view)
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• star (rating)
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• truck (shipping)
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• check (success)
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• x (close)
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• chevron-left, chevron-right
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• spinner (loading)
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🚀 PERFORMANCE
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═════════════════════════════════════════════════════════════════
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Optimization Techniques:
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1. Image Optimization
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• WebP format
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• Lazy loading
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• Responsive images (srcset)
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• CDN delivery
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2. Code Splitting
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• Base layout loads first
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• Page-specific JS loads after
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• Deferred non-critical CSS
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3. Caching
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• Browser cache for assets
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• LocalStorage for cart
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• Service worker (optional)
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4. Lazy Loading
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• Products load as you scroll
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• Images load when visible
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• Infinite scroll for large catalogs
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5. CDN Assets
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• Tailwind from CDN
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• Alpine.js from CDN
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• Vendor assets from CDN
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📊 PAGE-BY-PAGE BREAKDOWN
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═════════════════════════════════════════════════════════════════
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/ (Homepage)
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──────────────────────────────────────────────────────────────────
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Purpose: Display featured products, hero section
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Components:
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• Hero banner with CTA
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• Featured products grid
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• Category cards
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• About vendor section
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Data Sources:
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• GET /api/v1/shop/{code}/products?featured=true
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• GET /api/v1/shop/{code}/categories
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/products
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──────────────────────────────────────────────────────────────────
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Purpose: Browse all products with filters
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Components:
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• Product grid
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• Filter sidebar
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• Sort dropdown
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• Pagination
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Data Sources:
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• GET /api/v1/shop/{code}/products
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• Filters applied client-side or server-side
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/products/{product_id}
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──────────────────────────────────────────────────────────────────
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Purpose: Single product detail page
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Components:
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• Image gallery
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• Product info
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• Add to cart form
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• Related products
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• Reviews (optional)
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Data Sources:
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• GET /api/v1/shop/{code}/products/{id}
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• GET /api/v1/shop/{code}/products/{id}/related
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/cart
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──────────────────────────────────────────────────────────────────
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Purpose: Review cart contents before checkout
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Components:
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• Cart items list
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• Quantity adjusters
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• Remove buttons
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• Cart total
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• Checkout button
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Data Sources:
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• LocalStorage cart
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• No API call needed
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/checkout
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──────────────────────────────────────────────────────────────────
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Purpose: Complete purchase
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Components:
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• Shipping form
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• Payment form
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• Order summary
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• Submit button
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Data Sources:
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• POST /api/v1/shop/{code}/checkout
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• Stripe/PayPal integration
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/search
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──────────────────────────────────────────────────────────────────
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Purpose: Search results page
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Components:
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• Search input
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• Results grid
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• Filter options
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• Sort options
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Data Sources:
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• POST /api/v1/shop/{code}/search
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/category/{category_slug}
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──────────────────────────────────────────────────────────────────
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Purpose: Browse products by category
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Components:
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• Breadcrumbs
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• Product grid
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• Subcategories
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• Filters
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Data Sources:
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• GET /api/v1/shop/{code}/categories/{slug}/products
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/about
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──────────────────────────────────────────────────────────────────
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Purpose: About the vendor
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Components:
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• Vendor story
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• Team photos
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• Values/mission
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• Contact info
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Data Sources:
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• Vendor info from middleware
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• Static content
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/contact
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──────────────────────────────────────────────────────────────────
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Purpose: Contact form
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Components:
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• Contact form
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• Map (optional)
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• Business hours
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• Social links
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Data Sources:
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• POST /api/v1/shop/{code}/contact
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🎓 LEARNING PATH
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═════════════════════════════════════════════════════════════════
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For New Developers:
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1. Understand Architecture (1 hour)
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→ Read this document
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→ Review file structure
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→ Examine base template
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→ Understand theme system
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2. Study Existing Page (2 hours)
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→ Open home.html
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→ Open shop-layout.js
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→ Trace product loading flow
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→ Examine cart management
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3. Create Simple Page (4 hours)
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→ Copy templates
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→ Modify for new feature
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→ Test with different vendor themes
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→ Verify responsive design
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4. Add Complex Feature (1 day)
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→ Product filters
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→ Cart operations
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→ API integration
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→ Search functionality
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5. Master Patterns (1 week)
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→ All common patterns
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→ Theme customization
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→ Performance optimization
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→ Mobile responsiveness
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🔄 DEPLOYMENT CHECKLIST
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═════════════════════════════════════════════════════════════════
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Before Deploying:
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□ Build Tailwind CSS
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□ Minify JavaScript
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□ Test all routes
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□ Test with multiple vendor themes
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□ Verify cart persistence
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□ Check mobile responsive
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□ Test dark mode
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□ Validate product display
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□ Test checkout flow
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□ Check image optimization
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□ Test search functionality
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□ Verify social links
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□ Test across browsers
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□ Check console for errors
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□ Test in production mode
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🔒 SECURITY
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═════════════════════════════════════════════════════════════════
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Best Practices:
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1. Input Validation
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✅ Validate all form inputs
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✅ Sanitize user content
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✅ XSS prevention
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2. Cart Security
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✅ Validate cart on server
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✅ Check stock availability
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✅ Verify prices server-side
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✅ Never trust client cart
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3. Payment Security
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✅ Use trusted payment providers
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✅ Never store card details
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✅ HTTPS only
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✅ PCI compliance
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4. Rate Limiting
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✅ Search endpoint throttling
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✅ Contact form limits
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✅ Checkout attempt limits
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📚 REFERENCE LINKS
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═════════════════════════════════════════════════════════════════
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Documentation:
|
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• Alpine.js: https://alpinejs.dev/
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• Tailwind CSS: https://tailwindcss.com/
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• Jinja2: https://jinja.palletsprojects.com/
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• FastAPI: https://fastapi.tiangolo.com/
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Internal Docs:
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• Page Template Guide: FRONTEND_SHOP_ALPINE_PAGE_TEMPLATE.md
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• Multi-Theme Guide: MULTI_THEME_SHOP_GUIDE.md
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• API Documentation: API_REFERENCE.md
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• Database Schema: DATABASE_SCHEMA.md
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══════════════════════════════════════════════════════════════════
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SHOP FRONTEND ARCHITECTURE
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Theme-Driven, Customer-Focused, Brand-Consistent
|
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══════════════════════════════════════════════════════════════════
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