diff --git a/README.md b/README.md
index 9175203..d54c876 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,8 @@ Suite di AgentSkills per Agency AI OS v3.1 — trasformate da framework multi-ag
 
 ## Panoramica
 
-- **Skills:** 12
-- **References:** 17
+- **Skills:** 13
+- **References:** 20
 - **Lingua:** English (con note in italiano)
 - **Dominio:** Digital Agency / Content Production / Multi-Agent System
 
@@ -44,11 +44,13 @@ clawhub install agency_v3_1-skills
 | 8 | **agency-social** | Social strategy, calendario, post queue | Media |
 | 9 | **agency-youtube** | YouTube strategy, script retention-first | Media |
 | 10 | **agency-visual-generator** | Asset visuali (card, carousel, thumbnail) | Media |
-| 11 | **agency-analytics** | Report KPI settimanali, actions | Bassa |
-| 12 | **agency-publisher** | Publish gate-based (social/YouTube) | Bassa |
+| 11 | **agency-web-developer** | Siti web statici (HTML/CSS/JS) | Media |
+| 12 | **agency-analytics** | Report KPI settimanali, actions | Bassa |
+| 13 | **agency-publisher** | Publish gate-based (social/YouTube) | Bassa |
 
 ## References Incluse
 
+### Agency Core (17)
 1. `design_patterns.md` — Pattern UI riusabili
 2. `hero_sections.md` — Layout hero efficaci
 3. `layout_systems.md` — Grid, spacing, density
@@ -70,6 +72,11 @@ clawhub install agency_v3_1-skills
 19. `qa_visual.md` — QA checklist visual
 20. `weekly_report_template.md` — Template report
 
+### Web Developer (3)
+21. `html_semantics.md` — Semantic HTML best practices (in agency-web-developer/references)
+22. `css_layout.md` — Layout Bootstrap/custom (in agency-web-developer/references)
+23. `js_interactivity.md` — jQuery + GSAP patterns (in agency-web-developer/references)
+
 ## Workflow Consigliato
 
 1. **Onboarding:** `agency-orchestrator` → definisci MVP
@@ -77,7 +84,7 @@ clawhub install agency_v3_1-skills
 3. **Strategy:** `agency-strategy` → positioning, messaging
 4. **Creative:** `agency-creative-director` → direzione visiva
 5. **Design:** `agency-design-system` → design system
-6. **Website:** `agency-ux-copy` + `agency-seo` → sitemap, copy, SEO
+6. **Website:** `agency-ux-copy` → sitemap, copy → `agency-web-developer` → sito HTML/CSS/JS → `agency-seo` → metadata
 7. **Content:** `agency-social` + `agency-youtube` → calendar, script
 8. **Visual:** `agency-visual-generator` → asset
 9. **Publish:** `agency-publisher` → publish (post-approvazione)
diff --git a/agency-web-developer/SKILL.md b/agency-web-developer/SKILL.md
new file mode 100644
index 0000000..422a5aa
--- /dev/null
+++ b/agency-web-developer/SKILL.md
@@ -0,0 +1,346 @@
+---
+name: agency-web-developer
+description: Sviluppare siti web statici o landing page partendo da copy e design system. Usare quando: (1) costruire sito da sitemap + copy, (2) creare landing page, (3) implementare design in HTML/CSS/JS. Output: Sito completo con HTML semantico, CSS (Bootstrap o custom), JS (jQuery + GSAP).
+---
+
+# Agency Web Developer — Sviluppo Siti Web Statici
+
+Trasforma copy e design system in siti web funzionanti con HTML semantico, CSS e JS.
+
+## Quando Usare
+
+- **Nuovo sito:** Costruire sito completo da sitemap + copy + design tokens
+- **Landing page:** Pagina singola campaign-specific
+- **Design implementation:** Convertire mockup in codice
+- **Static site:** Sito senza backend (brochure, portfolio, landing)
+
+---
+
+## Input
+
+| Input | Tipo | Validazione |
+|-------|------|-------------|
+| `client_path` | string | Percorso client |
+| `sitemap` | object | Da agency-ux-copy |
+| `page_copy` | array | Copy completo per ogni pagina |
+| `design_tokens` | object | Da agency-design-system |
+| `page_layouts` | array | Layout definitions |
+| `seo_metadata` | array | SEO notes per pagina |
+
+---
+
+## Processo
+
+### Fase 1: Setup Struttura Progetto
+
+**Obiettivo:** Creare directory structure per il sito.
+
+**Azioni:**
+
+1. Crea cartella `clients/{client}/website/`
+2. Crea sottocartelle:
+   - `index.html` (homepage)
+   - `pages/` (altre pagine HTML)
+   - `css/` (stylesheet)
+   - `js/` (JavaScript)
+   - `assets/` (immagini, font, etc.)
+   - `assets/img/`
+   - `assets/fonts/`
+
+3. Inizializza file base:
+   - `css/main.css` (o `css/bootstrap.min.css` + `css/custom.css`)
+   - `js/main.js`
+   - `assets/` (vuoto, pronto per asset)
+
+**Output:**
+- Struttura directory pronta
+
+---
+
+### Fase 2: HTML Semantico
+
+**Obiettivo:** Costruire struttura HTML per ogni pagina.
+
+**Azioni:**
+
+1. **Per ogni pagina in sitemap:**
+
+2. **Struttura base:**
+   ```html
+   <!DOCTYPE html>
+   <html lang="it">
+   <head>
+     <meta charset="UTF-8">
+     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+     <title>{SEO Title}</title>
+     <meta name="description" content="{SEO Meta Description}">
+     <link rel="stylesheet" href="css/main.css">
+   </head>
+   <body>
+     <header>{Navigation}</header>
+     <main>{Content}</main>
+     <footer>{Footer}</footer>
+     <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
+     <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+     <script src="js/main.js"></script>
+   </body>
+   </html>
+   ```
+
+3. **Hero section:**
+   - `<section class="hero">`
+   - `<h1>` per headline
+   - `<p class="hero-sub">` per subcopy
+   - `<a class="btn btn-primary">` per CTA
+
+4. **Content sections:**
+   - Usa tag semantici: `<section>`, `<article>`, `<aside>`
+   - Heading hierarchy: `<h2>`, `<h3>` (mai saltare livelli)
+   - Liste: `<ul>`, `<ol>` con `<li>`
+   - Immagini: `<img alt="descrizione">`
+
+5. **Componenti da copy:**
+   - Card grid per services
+   - Testimonial blocks
+   - FAQ accordion
+   - CTA sections
+   - Form di contatto
+
+6. **Segui `references/html_semantics.md`:**
+   - Semantic HTML best practices
+   - Accessibility (ARIA labels dove necessario)
+   - SEO on-page (heading structure, alt text)
+
+**Output:**
+- `clients/{client}/website/index.html`
+- `clients/{client}/website/pages/*.html`
+
+---
+
+### Fase 3: CSS Layout
+
+**Obiettivo:** Stilizzare il sito con CSS.
+
+**Decisione: Bootstrap vs Custom**
+
+**Usa Bootstrap se:**
+- Design è standard (grid, cards, buttons standard)
+- Progetto semplice/veloce
+- Cliente non richiede customizzazione estrema
+
+**Usa Custom CSS se:**
+- Design altamente personalizzato
+- Brand ha linee guida specifiche
+- Layout non-standard
+
+**Azioni:**
+
+1. **Se Bootstrap:**
+   - Includi CDN in HTML
+   - Crea `css/custom.css` per override
+   - Usa classi Bootstrap (.container, .row, .col, .btn, etc.)
+   - Override tokens in custom.css
+
+2. **Se Custom:**
+   - Crea `css/main.css` da zero
+   - Implementa design tokens (fonts, colors, spacing)
+   - Crea grid system (o usa CSS Grid/Flexbox)
+   - Stilizza componenti uno a uno
+
+3. **Implementa da `references/css_layout.md`:**
+   - Responsive design (mobile-first)
+   - Breakpoints (mobile, tablet, desktop)
+   - Typography scale
+   - Color system
+   - Spacing system
+
+4. **Componenti da stilizzare:**
+   - Header/navigation (sticky, mobile menu)
+   - Hero section
+   - Buttons (primary, secondary, hover states)
+   - Cards
+   - Forms
+   - Footer
+
+**Output:**
+- `clients/{client}/website/css/main.css` (o `bootstrap.min.css` + `custom.css`)
+
+---
+
+### Fase 4: JavaScript Interattività
+
+**Obiettivo:** Aggiungere interattività al sito.
+
+**Librerie:**
+- **jQuery:** Per DOM manipulation, event handling, AJAX (se necessario)
+- **GSAP:** Per animazioni fluide, timeline, effetti complessi
+
+**Azioni:**
+
+1. **Includi librerie in HTML:**
+   ```html
+   <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
+   <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+   <script src="js/main.js"></script>
+   ```
+
+2. **Funzionalità base (jQuery):**
+   - Mobile menu toggle
+   - Smooth scroll per anchor links
+   - Form validation
+   - Accordion FAQ
+   - Image lazy loading
+   - Back to top button
+
+3. **Animazioni (GSAP):**
+   - Fade-in on scroll
+   - Hero animations (headline, CTA)
+   - Parallax effects (se richiesti)
+   - Hover animations complesse
+   - Timeline per sequenze animate
+
+4. **Segui `references/js_interactivity.md`:**
+   - Best practices jQuery
+   - GSAP patterns
+   - Performance considerations
+   - Accessibility (respect reduced-motion)
+
+**Template `js/main.js`:**
+```javascript
+$(document).ready(function() {
+  
+  // Mobile menu toggle
+  $('.mobile-menu-toggle').on('click', function() {
+    $('.nav-menu').toggleClass('is-open');
+  });
+  
+  // Smooth scroll
+  $('a[href^="#"]').on('click', function(e) {
+    e.preventDefault();
+    const target = $(this.getAttribute('href'));
+    if (target.length) {
+      $('html, body').animate({
+        scrollTop: target.offset().top - 80
+      }, 800);
+    }
+  });
+  
+  // FAQ accordion
+  $('.faq-question').on('click', function() {
+    $(this).next('.faq-answer').slideToggle(300);
+    $(this).toggleClass('is-active');
+  });
+  
+  // GSAP animations
+  gsap.from('.hero h1', {
+    duration: 1,
+    opacity: 0,
+    y: 30,
+    ease: 'power3.out'
+  });
+  
+  gsap.from('.hero .btn', {
+    duration: 1,
+    opacity: 0,
+    y: 20,
+    delay: 0.3,
+    ease: 'power3.out'
+  });
+  
+  // Scroll animations
+  gsap.utils.toArray('.fade-on-scroll').forEach(function(elem) {
+    gsap.to(elem, {
+      scrollTrigger: {
+        trigger: elem,
+        start: 'top 80%',
+        toggleActions: 'play none none none'
+      },
+      opacity: 1,
+      y: 0
+    });
+  });
+  
+});
+```
+
+**Output:**
+- `clients/{client}/website/js/main.js`
+
+---
+
+### Fase 5: QA e Testing
+
+**Obiettivo:** Verificare qualità del sito.
+
+**Azioni:**
+
+1. **HTML validation:**
+   - Tag chiusi correttamente
+   - Attributi required presenti
+   - Nesting corretto
+
+2. **CSS check:**
+   - Responsive su mobile/tablet/desktop
+   - Color contrast (accessibility)
+   - No overflow o layout broken
+
+3. **JS check:**
+   - Console errors (nessuno)
+   - Funzionalità testate (menu, form, accordion)
+   - Animazioni fluide
+
+4. **SEO check:**
+   - Title tag unico per pagina
+   - Meta description presente
+   - Heading hierarchy corretta
+   - Alt text su immagini
+
+5. **Performance:**
+   - Immagini ottimizzate (se presenti)
+   - CSS/JS minified (opzionale)
+   - No console warnings
+
+**Output:**
+- `clients/{client}/website/qa/qa_website.md`
+
+---
+
+## Output
+
+| File | Formato | Descrizione |
+|------|---------|-------------|
+| `clients/{client}/website/index.html` | HTML | Homepage |
+| `clients/{client}/website/pages/*.html` | HTML | Altre pagine |
+| `clients/{client}/website/css/main.css` | CSS | Stylesheet |
+| `clients/{client}/website/js/main.js` | JS | Interattività |
+| `clients/{client}/website/assets/` | Folder | Immagini, font, etc. |
+| `clients/{client}/website/qa/qa_website.md` | Markdown | QA checklist |
+
+---
+
+## References
+
+- [html_semantics.md](./references/html_semantics.md) — Semantic HTML best practices
+- [css_layout.md](./references/css_layout.md) — Layout, responsive, Bootstrap
+- [js_interactivity.md](./references/js_interactivity.md) — jQuery + GSAP patterns
+
+---
+
+## Note
+
+**Edge Cases:**
+
+- **Nessun design system:** Usa Bootstrap default + stile minimal
+- **Solo landing page:** Crea single-page con anchor navigation
+- **Cliente fornisce asset:** Copia in `assets/` e usa percorsi corretti
+- **Animazioni complesse:** Usa GSAP timeline, documenta in decision log
+
+**Limitazioni:**
+
+- Siti statici (no backend, no database)
+- Form richiedono servizio esterno (Formspree, Netlify Forms) o backend
+- E-commerce non supportato (richiede piattaforma dedicata)
+
+---
+
+_Skill creata per agency_v3_1 suite_
diff --git a/agency-web-developer/references/css_layout.md b/agency-web-developer/references/css_layout.md
new file mode 100644
index 0000000..478192b
--- /dev/null
+++ b/agency-web-developer/references/css_layout.md
@@ -0,0 +1,647 @@
+# CSS Layout — Bootstrap e Custom
+
+Guida per creare layout responsive con Bootstrap o CSS custom.
+
+---
+
+## Decisione: Bootstrap vs Custom
+
+### Usa Bootstrap Quando:
+
+✅ Design standard (grid, cards, buttons)
+✅ Progetto veloce / MVP
+✅ Cliente non richiede customizzazione estrema
+✅ Team piccolo, nessun designer dedicato
+
+### Usa Custom CSS Quando:
+
+✅ Design altamente personalizzato
+✅ Brand guidelines specifiche
+✅ Layout non-standard / creativi
+✅ Performance critica (no CSS unused)
+
+---
+
+## Bootstrap Setup
+
+### CDN Setup
+
+```html
+<head>
+  <!-- Bootstrap CSS -->
+  <link 
+    href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" 
+    rel="stylesheet"
+  >
+  
+  <!-- Custom CSS (override) -->
+  <link rel="stylesheet" href="css/custom.css">
+</head>
+
+<body>
+  <!-- Bootstrap JS (opzionale, solo se serve JS components) -->
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
+</body>
+```
+
+### Custom CSS Override
+
+```css
+/* css/custom.css */
+
+:root {
+  /* Override Bootstrap variables */
+  --bs-primary: #005fcc;
+  --bs-secondary: #6c757d;
+  --bs-font-sans-serif: 'Inter', system-ui, -apple-system, sans-serif;
+  --bs-body-font-size: 1rem;
+  --bs-body-line-height: 1.6;
+}
+
+/* Custom styles */
+.hero {
+  padding: 120px 0;
+  background: linear-gradient(135deg, #005fcc 0%, #003d99 100%);
+  color: white;
+}
+
+.btn-primary {
+  padding: 12px 32px;
+  font-weight: 600;
+  border-radius: 4px;
+}
+```
+
+---
+
+## Responsive Design
+
+### Breakpoints
+
+```css
+/* Mobile-first approach */
+
+/* Mobile: default (< 768px) */
+.container {
+  padding: 0 16px;
+}
+
+/* Tablet (≥ 768px) */
+@media (min-width: 768px) {
+  .container {
+    padding: 0 24px;
+  }
+  
+  .hero {
+    padding: 160px 0;
+  }
+}
+
+/* Desktop (≥ 1024px) */
+@media (min-width: 1024px) {
+  .container {
+    max-width: 1200px;
+    margin: 0 auto;
+    padding: 0 32px;
+  }
+}
+
+/* Large Desktop (≥ 1440px) */
+@media (min-width: 1440px) {
+  .container {
+    max-width: 1400px;
+  }
+}
+```
+
+### Bootstrap Grid
+
+```html
+<!-- Container -->
+<div class="container">
+  <!-- Row -->
+  <div class="row">
+    <!-- Mobile: 1 colonna, Tablet: 2 colonne, Desktop: 3 colonne -->
+    <div class="col-12 col-md-6 col-lg-4">
+      <!-- Content -->
+    </div>
+    <div class="col-12 col-md-6 col-lg-4">
+      <!-- Content -->
+    </div>
+    <div class="col-12 col-md-6 col-lg-4">
+      <!-- Content -->
+    </div>
+  </div>
+</div>
+```
+
+---
+
+## Typography
+
+### Design Tokens
+
+```css
+:root {
+  /* Font Families */
+  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
+  --font-secondary: 'Georgia', serif;
+  
+  /* Font Sizes (modular scale) */
+  --text-xs: 0.75rem;    /* 12px */
+  --text-sm: 0.875rem;   /* 14px */
+  --text-base: 1rem;     /* 16px */
+  --text-lg: 1.125rem;   /* 18px */
+  --text-xl: 1.25rem;    /* 20px */
+  --text-2xl: 1.5rem;    /* 24px */
+  --text-3xl: 1.875rem;  /* 30px */
+  --text-4xl: 2.25rem;   /* 36px */
+  --text-5xl: 3rem;      /* 48px */
+  
+  /* Font Weights */
+  --font-normal: 400;
+  --font-medium: 500;
+  --font-semibold: 600;
+  --font-bold: 700;
+  
+  /* Line Heights */
+  --leading-tight: 1.25;
+  --leading-normal: 1.5;
+  --leading-relaxed: 1.75;
+  
+  /* Letter Spacing */
+  --tracking-tight: -0.025em;
+  --tracking-normal: 0;
+  --tracking-wide: 0.025em;
+}
+
+/* Base Typography */
+body {
+  font-family: var(--font-primary);
+  font-size: var(--text-base);
+  line-height: var(--leading-normal);
+  color: #1a1a1a;
+}
+
+/* Headings */
+h1 {
+  font-size: var(--text-5xl);
+  font-weight: var(--font-bold);
+  line-height: var(--leading-tight);
+  letter-spacing: var(--tracking-tight);
+}
+
+h2 {
+  font-size: var(--text-4xl);
+  font-weight: var(--font-bold);
+  line-height: var(--leading-tight);
+}
+
+h3 {
+  font-size: var(--text-3xl);
+  font-weight: var(--font-semibold);
+  line-height: var(--leading-tight);
+}
+
+/* Responsive typography */
+@media (max-width: 767px) {
+  h1 { font-size: var(--text-4xl); }
+  h2 { font-size: var(--text-3xl); }
+  h3 { font-size: var(--text-2xl); }
+}
+```
+
+---
+
+## Spacing System
+
+### Scala Modulare
+
+```css
+:root {
+  --space-1: 4px;
+  --space-2: 8px;
+  --space-3: 12px;
+  --space-4: 16px;
+  --space-5: 20px;
+  --space-6: 24px;
+  --space-8: 32px;
+  --space-10: 40px;
+  --space-12: 48px;
+  --space-16: 64px;
+  --space-20: 80px;
+  --space-24: 96px;
+}
+
+/* Section padding */
+.section-padding {
+  padding: var(--space-16) 0;
+}
+
+@media (min-width: 768px) {
+  .section-padding {
+    padding: var(--space-24) 0;
+  }
+}
+
+/* Component spacing */
+.card {
+  padding: var(--space-6);
+}
+
+.btn {
+  padding: var(--space-3) var(--space-6);
+}
+```
+
+---
+
+## Color System
+
+### Palette
+
+```css
+:root {
+  /* Primary Brand Colors */
+  --color-primary: #005fcc;
+  --color-primary-dark: #003d99;
+  --color-primary-light: #3385ff;
+  
+  /* Secondary Colors */
+  --color-secondary: #6c757d;
+  --color-secondary-dark: #5a6268;
+  --color-secondary-light: #868e96;
+  
+  /* Neutrals */
+  --color-white: #ffffff;
+  --color-gray-50: #f9fafb;
+  --color-gray-100: #f3f4f6;
+  --color-gray-200: #e5e7eb;
+  --color-gray-300: #d1d5db;
+  --color-gray-400: #9ca3af;
+  --color-gray-500: #6b7280;
+  --color-gray-600: #4b5563;
+  --color-gray-700: #374151;
+  --color-gray-800: #1f2937;
+  --color-gray-900: #111827;
+  --color-black: #000000;
+  
+  /* Semantic Colors */
+  --color-success: #10b981;
+  --color-warning: #f59e0b;
+  --color-error: #ef4444;
+  --color-info: #3b82f6;
+  
+  /* Text Colors */
+  --text-primary: var(--color-gray-900);
+  --text-secondary: var(--color-gray-600);
+  --text-muted: var(--color-gray-500);
+  --text-inverse: var(--color-white);
+  
+  /* Background Colors */
+  --bg-primary: var(--color-white);
+  --bg-secondary: var(--color-gray-50);
+  --bg-tertiary: var(--color-gray-100);
+}
+```
+
+### Usage
+
+```css
+/* Text */
+.text-primary { color: var(--text-primary); }
+.text-secondary { color: var(--text-secondary); }
+.text-muted { color: var(--text-muted); }
+.text-inverse { color: var(--text-inverse); }
+
+/* Backgrounds */
+.bg-primary { background-color: var(--bg-primary); }
+.bg-secondary { background-color: var(--bg-secondary); }
+.bg-brand { background-color: var(--color-primary); }
+
+/* Buttons */
+.btn-primary {
+  background-color: var(--color-primary);
+  color: var(--color-white);
+}
+
+.btn-primary:hover {
+  background-color: var(--color-primary-dark);
+}
+
+.btn-secondary {
+  background-color: transparent;
+  color: var(--color-primary);
+  border: 2px solid var(--color-primary);
+}
+```
+
+---
+
+## Component Styles
+
+### Buttons
+
+```css
+.btn {
+  display: inline-block;
+  padding: 12px 32px;
+  font-size: var(--text-base);
+  font-weight: var(--font-semibold);
+  text-decoration: none;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.btn-primary {
+  background-color: var(--color-primary);
+  color: var(--color-white);
+}
+
+.btn-primary:hover {
+  background-color: var(--color-primary-dark);
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(0, 95, 204, 0.3);
+}
+
+.btn-secondary {
+  background-color: transparent;
+  color: var(--color-primary);
+  border: 2px solid var(--color-primary);
+}
+
+.btn-secondary:hover {
+  background-color: var(--color-primary);
+  color: var(--color-white);
+}
+
+/* Responsive buttons */
+@media (max-width: 767px) {
+  .btn {
+    width: 100%;
+    text-align: center;
+  }
+}
+```
+
+### Cards
+
+```css
+.card {
+  background: var(--color-white);
+  border-radius: 8px;
+  padding: var(--space-6);
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
+  transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+
+.card:hover {
+  transform: translateY(-4px);
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
+}
+
+.card-image {
+  width: 100%;
+  height: 200px;
+  object-fit: cover;
+  border-radius: 4px;
+  margin-bottom: var(--space-4);
+}
+
+.card-title {
+  font-size: var(--text-xl);
+  font-weight: var(--font-semibold);
+  margin-bottom: var(--space-2);
+}
+
+.card-description {
+  color: var(--text-secondary);
+  margin-bottom: var(--space-4);
+}
+```
+
+### Forms
+
+```css
+.form-group {
+  margin-bottom: var(--space-4);
+}
+
+.form-label {
+  display: block;
+  font-weight: var(--font-medium);
+  margin-bottom: var(--space-2);
+  color: var(--text-primary);
+}
+
+.form-control {
+  width: 100%;
+  padding: 12px 16px;
+  font-size: var(--text-base);
+  border: 1px solid var(--color-gray-300);
+  border-radius: 4px;
+  transition: border-color 0.2s ease, box-shadow 0.2s ease;
+}
+
+.form-control:focus {
+  outline: none;
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 3px rgba(0, 95, 204, 0.1);
+}
+
+.form-control::placeholder {
+  color: var(--text-muted);
+}
+
+.form-error {
+  color: var(--color-error);
+  font-size: var(--text-sm);
+  margin-top: var(--space-1);
+}
+```
+
+---
+
+## Layout Patterns
+
+### Hero Section
+
+```css
+.hero {
+  position: relative;
+  padding: 120px 0;
+  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
+  color: var(--color-white);
+  overflow: hidden;
+}
+
+.hero-content {
+  max-width: 800px;
+  margin: 0 auto;
+  text-align: center;
+}
+
+.hero h1 {
+  font-size: var(--text-5xl);
+  margin-bottom: var(--space-4);
+}
+
+.hero-sub {
+  font-size: var(--text-xl);
+  opacity: 0.9;
+  margin-bottom: var(--space-8);
+}
+
+.hero-cta {
+  display: flex;
+  gap: var(--space-4);
+  justify-content: center;
+  flex-wrap: wrap;
+}
+
+/* Responsive hero */
+@media (max-width: 767px) {
+  .hero {
+    padding: 80px 0;
+  }
+  
+  .hero h1 {
+    font-size: var(--text-4xl);
+  }
+  
+  .hero-sub {
+    font-size: var(--text-lg);
+  }
+}
+```
+
+### Grid Layout
+
+```css
+.grid {
+  display: grid;
+  gap: var(--space-6);
+}
+
+.grid-2 {
+  grid-template-columns: repeat(2, 1fr);
+}
+
+.grid-3 {
+  grid-template-columns: repeat(3, 1fr);
+}
+
+.grid-4 {
+  grid-template-columns: repeat(4, 1fr);
+}
+
+/* Responsive grid */
+@media (max-width: 1023px) {
+  .grid-4 {
+    grid-template-columns: repeat(2, 1fr);
+  }
+}
+
+@media (max-width: 767px) {
+  .grid-2,
+  .grid-3,
+  .grid-4 {
+    grid-template-columns: 1fr;
+  }
+}
+```
+
+### Split Layout
+
+```css
+.split-layout {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: var(--space-12);
+  align-items: center;
+}
+
+.split-image {
+  width: 100%;
+  height: auto;
+  border-radius: 8px;
+}
+
+/* Responsive split */
+@media (max-width: 1023px) {
+  .split-layout {
+    grid-template-columns: 1fr;
+    gap: var(--space-8);
+  }
+  
+  .split-image {
+    order: -1; /* Image first on mobile */
+  }
+}
+```
+
+---
+
+## Utility Classes
+
+```css
+/* Display */
+.d-none { display: none; }
+.d-block { display: block; }
+.d-flex { display: flex; }
+.d-grid { display: grid; }
+.d-inline-block { display: inline-block; }
+
+/* Flexbox */
+.flex-row { flex-direction: row; }
+.flex-column { flex-direction: column; }
+.justify-start { justify-content: flex-start; }
+.justify-center { justify-content: center; }
+.justify-end { justify-content: flex-end; }
+.justify-between { justify-content: space-between; }
+.align-start { align-items: flex-start; }
+.align-center { align-items: center; }
+.align-end { align-items: flex-end; }
+.flex-wrap { flex-wrap: wrap; }
+.gap-2 { gap: var(--space-2); }
+.gap-4 { gap: var(--space-4); }
+.gap-6 { gap: var(--space-6); }
+.gap-8 { gap: var(--space-8); }
+
+/* Text Alignment */
+.text-left { text-align: left; }
+.text-center { text-align: center; }
+.text-right { text-align: right; }
+
+/* Spacing */
+.mt-4 { margin-top: var(--space-4); }
+.mb-4 { margin-bottom: var(--space-4); }
+.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
+.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
+
+/* Visibility */
+.visible { visibility: visible; }
+.invisible { visibility: hidden; }
+```
+
+---
+
+## Checklist Layout
+
+- [ ] Mobile-first approach
+- [ ] Breakpoints definiti (mobile, tablet, desktop)
+- [ ] Typography scale coerente
+- [ ] Spacing system modulare
+- [ ] Color palette definita
+- [ ] Buttons stilizzati (hover states)
+- [ ] Cards con shadow e hover effect
+- [ ] Forms accessibili e responsive
+- [ ] Grid system funzionante
+- [ ] Utility classes per layout veloci
+- [ ] Test su mobile/tablet/desktop
+
+---
+
+_References per agency-web-developer skill_
diff --git a/agency-web-developer/references/html_semantics.md b/agency-web-developer/references/html_semantics.md
new file mode 100644
index 0000000..3428d14
--- /dev/null
+++ b/agency-web-developer/references/html_semantics.md
@@ -0,0 +1,418 @@
+# HTML Semantics — Best Practices
+
+Guida per costruire HTML semantico, accessibile e SEO-friendly.
+
+---
+
+## Document Structure
+
+### Base Template
+
+```html
+<!DOCTYPE html>
+<html lang="it">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta name="description" content="{descrizione pagina}">
+  <title>{Titolo pagina} | {Brand}</title>
+  
+  <!-- CSS -->
+  <link rel="stylesheet" href="css/main.css">
+  
+  <!-- Favicon -->
+  <link rel="icon" href="assets/img/favicon.ico" type="image/x-icon">
+</head>
+<body>
+  <header>{Navigation}</header>
+  <main>{Contenuto principale}</main>
+  <footer>{Footer}</footer>
+  
+  <!-- JS -->
+  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+  <script src="js/main.js"></script>
+</body>
+</html>
+```
+
+---
+
+## Semantic Elements
+
+### Header
+
+```html
+<header>
+  <nav aria-label="Main navigation">
+    <a href="/" class="logo">
+      <img src="assets/img/logo.svg" alt="{Brand Name}">
+    </a>
+    <ul class="nav-menu">
+      <li><a href="/">Home</a></li>
+      <li><a href="/pages/services.html">Servizi</a></li>
+      <li><a href="/pages/about.html">Chi Siamo</a></li>
+      <li><a href="/pages/contact.html">Contatti</a></li>
+    </ul>
+    <button class="mobile-menu-toggle" aria-label="Toggle menu">
+      <span></span>
+      <span></span>
+      <span></span>
+    </button>
+  </nav>
+</header>
+```
+
+### Main Content
+
+```html
+<main>
+  <!-- Hero Section -->
+  <section class="hero" aria-labelledby="hero-title">
+    <h1 id="hero-title">Headline principale</h1>
+    <p class="hero-sub">Subcopy di supporto</p>
+    <a href="#cta" class="btn btn-primary">Call to Action</a>
+  </section>
+  
+  <!-- Services Section -->
+  <section class="services" aria-labelledby="services-title">
+    <h2 id="services-title">I Nostri Servizi</h2>
+    <div class="services-grid">
+      <article class="service-card">
+        <h3>Servizio 1</h3>
+        <p>Descrizione servizio</p>
+        <a href="#">Scopri di più</a>
+      </article>
+      <!-- Altre card -->
+    </div>
+  </section>
+  
+  <!-- Testimonial Section -->
+  <section class="testimonials" aria-labelledby="testimonials-title">
+    <h2 id="testimonials-title">Dicono di Noi</h2>
+    <article class="testimonial">
+      <blockquote>
+        <p>"Testimonial text"</p>
+      </blockquote>
+      <cite>— Nome Cliente, Azienda</cite>
+    </article>
+  </section>
+  
+  <!-- FAQ Section -->
+  <section class="faq" aria-labelledby="faq-title">
+    <h2 id="faq-title">Domande Frequenti</h2>
+    <div class="faq-list">
+      <article class="faq-item">
+        <h3>
+          <button class="faq-question" aria-expanded="false">
+            Domanda 1
+          </button>
+        </h3>
+        <div class="faq-answer">
+          <p>Risposta alla domanda</p>
+        </div>
+      </article>
+    </div>
+  </section>
+  
+  <!-- CTA Section -->
+  <section class="cta" aria-labelledby="cta-title">
+    <h2 id="cta-title">Pronto a Iniziare?</h2>
+    <a href="/pages/contact.html" class="btn btn-primary" id="cta">Contattaci</a>
+  </section>
+</main>
+```
+
+### Footer
+
+```html
+<footer>
+  <div class="footer-content">
+    <div class="footer-brand">
+      <img src="assets/img/logo.svg" alt="{Brand Name}">
+      <p>Descrizione breve del brand</p>
+    </div>
+    <nav aria-label="Footer navigation">
+      <ul>
+        <li><a href="/">Home</a></li>
+        <li><a href="/pages/services.html">Servizi</a></li>
+        <li><a href="/pages/about.html">Chi Siamo</a></li>
+        <li><a href="/pages/contact.html">Contatti</a></li>
+      </ul>
+    </nav>
+    <div class="footer-contact">
+      <p>Email: info@example.com</p>
+      <p>Tel: +39 123 456 7890</p>
+    </div>
+    <div class="footer-social">
+      <a href="#" aria-label="Facebook">FB</a>
+      <a href="#" aria-label="Instagram">IG</a>
+      <a href="#" aria-label="LinkedIn">LI</a>
+    </div>
+  </div>
+  <div class="footer-bottom">
+    <p>&copy; 2024 {Brand Name}. Tutti i diritti riservati.</p>
+    <nav aria-label="Legal navigation">
+      <a href="/pages/privacy.html">Privacy Policy</a>
+      <a href="/pages/cookie.html">Cookie Policy</a>
+    </nav>
+  </div>
+</footer>
+```
+
+---
+
+## Heading Hierarchy
+
+### Regole
+
+1. **Un solo H1 per pagina** (di solito nella hero)
+2. **Mai saltare livelli** (H2 → H3 → H4, non H2 → H4)
+3. **Heading descrittivi** (non "Section 1", ma "I Nostri Servizi")
+4. **Keyword rilevanti** (SEO-friendly ma naturale)
+
+### Esempio Corretto
+
+```html
+<h1>Consulenza Marketing Digitale</h1>
+
+<section>
+  <h2>I Nostri Servizi</h2>
+  
+  <article>
+    <h3>SEO Optimization</h3>
+    <p>...</p>
+  </article>
+  
+  <article>
+    <h3>Social Media Management</h3>
+    <p>...</p>
+  </article>
+</section>
+
+<section>
+  <h2>Perché Sceglierci</h2>
+  <h3>Esperienza Decennale</h3>
+  <h3>Team Certificato</h3>
+</section>
+```
+
+---
+
+## Accessibility
+
+### ARIA Labels
+
+```html
+<!-- Navigation -->
+<nav aria-label="Main navigation">...</nav>
+<nav aria-label="Footer navigation">...</nav>
+
+<!-- Sections -->
+<section aria-labelledby="services-title">
+  <h2 id="services-title">Servizi</h2>
+</section>
+
+<!-- Buttons -->
+<button aria-label="Close menu" class="close-btn">×</button>
+<button aria-label="Toggle FAQ" aria-expanded="false" class="faq-question">
+  Domanda
+</button>
+
+<!-- Forms -->
+<label for="email">Email</label>
+<input type="email" id="email" name="email" required aria-required="true">
+
+<!-- Images -->
+<img src="team-photo.jpg" alt="Team di 5 persone in ufficio">
+<img src="decorative-pattern.svg" alt="" role="presentation">
+```
+
+### Focus States
+
+```css
+/* Assicurati che tutti gli elementi focusabili abbiano visible focus */
+a:focus,
+button:focus,
+input:focus,
+select:focus,
+textarea:focus {
+  outline: 2px solid #005fcc;
+  outline-offset: 2px;
+}
+
+/* Skip link per keyboard navigation */
+.skip-link {
+  position: absolute;
+  top: -40px;
+  left: 0;
+  background: #005fcc;
+  color: white;
+  padding: 8px;
+  z-index: 100;
+}
+
+.skip-link:focus {
+  top: 0;
+}
+```
+
+```html
+<body>
+  <a href="#main-content" class="skip-link">Vai al contenuto principale</a>
+  <header>...</header>
+  <main id="main-content">...</main>
+</body>
+```
+
+---
+
+## Images
+
+### Best Practices
+
+```html
+<!-- Immagine con descrizione -->
+<img src="team.jpg" alt="Team di 5 persone sorridenti in ufficio moderno">
+
+<!-- Immagine decorativa (no alt text) -->
+<img src="pattern.svg" alt="" role="presentation">
+
+<!-- Immagine responsive -->
+<img 
+  src="hero-mobile.jpg" 
+  srcset="hero-mobile.jpg 480w, hero-tablet.jpg 768w, hero-desktop.jpg 1200w"
+  sizes="(max-width: 480px) 100vw, (max-width: 768px) 100vw, 100vw"
+  alt="Hero image"
+>
+
+<!-- Lazy loading -->
+<img src="placeholder.jpg" data-src="actual-image.jpg" loading="lazy" alt="Descrizione">
+```
+
+---
+
+## Forms
+
+### Contact Form
+
+```html
+<form action="https://formspree.io/f/{id}" method="POST" class="contact-form">
+  <div class="form-group">
+    <label for="name">Nome Completo</label>
+    <input 
+      type="text" 
+      id="name" 
+      name="name" 
+      required 
+      aria-required="true"
+      autocomplete="name"
+    >
+  </div>
+  
+  <div class="form-group">
+    <label for="email">Email</label>
+    <input 
+      type="email" 
+      id="email" 
+      name="email" 
+      required 
+      aria-required="true"
+      autocomplete="email"
+    >
+  </div>
+  
+  <div class="form-group">
+    <label for="message">Messaggio</label>
+    <textarea 
+      id="message" 
+      name="message" 
+      rows="5" 
+      required 
+      aria-required="true"
+    ></textarea>
+  </div>
+  
+  <button type="submit" class="btn btn-primary">Invia Messaggio</button>
+  
+  <p class="form-note">
+    <small>Inviando questo form accetti la nostra 
+    <a href="/pages/privacy.html">privacy policy</a>.</small>
+  </p>
+</form>
+```
+
+---
+
+## SEO On-Page
+
+### Meta Tags
+
+```html
+<head>
+  <!-- Required -->
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>{Keyword Primaria} | {Brand Name}</title>
+  <meta name="description" content="{150-160 caratteri con keyword}">
+  
+  <!-- Open Graph (social sharing) -->
+  <meta property="og:title" content="{Titolo pagina}">
+  <meta property="og:description" content="{Descrizione}">
+  <meta property="og:image" content="https://example.com/assets/img/og-image.jpg">
+  <meta property="og:url" content="https://example.com/pagina.html">
+  <meta property="og:type" content="website">
+  
+  <!-- Twitter Card -->
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:title" content="{Titolo}">
+  <meta name="twitter:description" content="{Descrizione}">
+  <meta name="twitter:image" content="https://example.com/assets/img/twitter-image.jpg">
+  
+  <!-- Canonical URL -->
+  <link rel="canonical" href="https://example.com/pagina.html">
+</head>
+```
+
+### Structured Data (JSON-LD)
+
+```html
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "LocalBusiness",
+  "name": "{Brand Name}",
+  "image": "https://example.com/assets/img/logo.png",
+  "description": "{Descrizione business}",
+  "address": {
+    "@type": "PostalAddress",
+    "streetAddress": "Via Roma 123",
+    "addressLocality": "Milano",
+    "postalCode": "20100",
+    "addressCountry": "IT"
+  },
+  "telephone": "+391234567890",
+  "url": "https://example.com"
+}
+</script>
+```
+
+---
+
+## Checklist Semantica
+
+- [ ] Un solo H1 per pagina
+- [ ] Heading hierarchy corretta (no salti)
+- [ ] Tag semantici usati (`<header>`, `<main>`, `<footer>`, `<section>`, `<article>`, `<nav>`)
+- [ ] ARIA labels dove necessario
+- [ ] Alt text su tutte le immagini (o vuoto per decorative)
+- [ ] Form label associati correttamente
+- [ ] Focus states visibili
+- [ ] Skip link per keyboard navigation
+- [ ] Meta title + description unici per pagina
+- [ ] Canonical URL impostata
+- [ ] Open Graph tags per social sharing
+
+---
+
+_References per agency-web-developer skill_
diff --git a/agency-web-developer/references/js_interactivity.md b/agency-web-developer/references/js_interactivity.md
new file mode 100644
index 0000000..c2a998b
--- /dev/null
+++ b/agency-web-developer/references/js_interactivity.md
@@ -0,0 +1,730 @@
+# JavaScript Interactivity — jQuery + GSAP
+
+Guida per aggiungere interattività e animazioni fluide ai siti web.
+
+---
+
+## Setup Librerie
+
+### CDN Links
+
+```html
+<head>
+  <!-- jQuery -->
+  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
+  
+  <!-- GSAP -->
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+  
+  <!-- GSAP ScrollTrigger (opzionale, per scroll animations) -->
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/ScrollTrigger.min.js"></script>
+</head>
+
+<body>
+  <!-- Main JS -->
+  <script src="js/main.js"></script>
+</body>
+```
+
+---
+
+## jQuery Patterns
+
+### Document Ready
+
+```javascript
+$(document).ready(function() {
+  // Tutto il codice va qui dentro
+  // o usa la shorthand:
+});
+
+// Shorthand (equivalente)
+$(function() {
+  // Codice qui
+});
+```
+
+### Mobile Menu Toggle
+
+```javascript
+$(function() {
+  const $menuToggle = $('.mobile-menu-toggle');
+  const $navMenu = $('.nav-menu');
+  const $body = $('body');
+  
+  $menuToggle.on('click', function() {
+    $navMenu.toggleClass('is-open');
+    $menuToggle.toggleClass('is-active');
+    $body.toggleClass('menu-open');
+    
+    // Update ARIA
+    const expanded = $menuToggle.attr('aria-expanded') === 'true';
+    $menuToggle.attr('aria-expanded', !expanded);
+  });
+  
+  // Close menu on link click (mobile)
+  $navMenu.find('a').on('click', function() {
+    if ($(window).width() < 768) {
+      $navMenu.removeClass('is-open');
+      $menuToggle.removeClass('is-active');
+      $body.removeClass('menu-open');
+      $menuToggle.attr('aria-expanded', 'false');
+    }
+  });
+  
+  // Close menu on outside click
+  $(document).on('click', function(e) {
+    if (!$(e.target).closest('.nav-menu, .mobile-menu-toggle').length) {
+      $navMenu.removeClass('is-open');
+      $menuToggle.removeClass('is-active');
+      $body.removeClass('menu-open');
+      $menuToggle.attr('aria-expanded', 'false');
+    }
+  });
+});
+```
+
+### Smooth Scroll
+
+```javascript
+$(function() {
+  $('a[href^="#"]').on('click', function(e) {
+    const targetId = this.getAttribute('href');
+    
+    // Ignora link vuoti o non-anchor
+    if (targetId === '#' || !targetId.startsWith('#')) return;
+    
+    const $target = $(targetId);
+    
+    if ($target.length) {
+      e.preventDefault();
+      
+      const offsetTop = $target.offset().top;
+      const headerHeight = $('header').outerHeight() || 0;
+      const scrollPosition = offsetTop - headerHeight - 20;
+      
+      $('html, body').stop().animate({
+        scrollTop: scrollPosition
+      }, 800, 'easeInOutQuad');
+      
+      // Update URL without jumping
+      history.pushState(null, null, targetId);
+    }
+  });
+});
+
+// Easing function (se non usi jQuery easing plugin)
+$.easing.easeInOutQuad = function(x, t, b, c, d) {
+  t /= d / 2;
+  if (t < 1) return c / 2 * t * t + b;
+  t--;
+  return -c / 2 * (t * (t - 2) - 1) + b;
+};
+```
+
+### FAQ Accordion
+
+```javascript
+$(function() {
+  const $faqQuestions = $('.faq-question');
+  
+  $faqQuestions.on('click', function() {
+    const $question = $(this);
+    const $answer = $question.next('.faq-answer');
+    const $item = $question.closest('.faq-item');
+    const isActive = $question.hasClass('is-active');
+    
+    // Close all other items (accordion style)
+    $faqQuestions.not(this).removeClass('is-active');
+    $('.faq-answer').not($answer).slideUp(300);
+    $('.faq-item').not($item).removeClass('is-active');
+    
+    // Toggle current item
+    $question.toggleClass('is-active');
+    $answer.slideToggle(300);
+    $item.toggleClass('is-active');
+    
+    // Update ARIA
+    const expanded = $question.attr('aria-expanded') === 'true';
+    $question.attr('aria-expanded', !expanded);
+  });
+  
+  // Keyboard accessibility
+  $faqQuestions.on('keydown', function(e) {
+    if (e.key === 'Enter' || e.key === ' ') {
+      e.preventDefault();
+      $(this).click();
+    }
+  });
+});
+```
+
+### Form Validation
+
+```javascript
+$(function() {
+  const $form = $('.contact-form');
+  const $submitBtn = $form.find('button[type="submit"]');
+  
+  $form.on('submit', function(e) {
+    let isValid = true;
+    
+    // Validate required fields
+    $form.find('[required]').each(function() {
+      const $field = $(this);
+      const value = $field.val().trim();
+      const $error = $field.siblings('.form-error');
+      
+      if (!value) {
+        isValid = false;
+        $field.addClass('is-invalid');
+        if ($error.length) {
+          $error.text('Questo campo è obbligatorio').show();
+        } else {
+          $field.after('<span class="form-error">Questo campo è obbligatorio</span>');
+        }
+      } else {
+        $field.removeClass('is-invalid');
+        $error.hide();
+        
+        // Email validation
+        if ($field.attr('type') === 'email') {
+          const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+          if (!emailRegex.test(value)) {
+            isValid = false;
+            $field.addClass('is-invalid');
+            if ($error.length) {
+              $error.text('Inserisci un\'email valida').show();
+            } else {
+              $field.after('<span class="form-error">Inserisci un\'email valida</span>');
+            }
+          }
+        }
+      }
+    });
+    
+    if (!isValid) {
+      e.preventDefault();
+      // Scroll to first error
+      const $firstError = $form.find('.is-invalid').first();
+      if ($firstError.length) {
+        $('html, body').animate({
+          scrollTop: $firstError.offset().top - 100
+        }, 500);
+      }
+    }
+  });
+  
+  // Clear error on input
+  $form.find('input, textarea').on('input', function() {
+    $(this).removeClass('is-invalid');
+    $(this).siblings('.form-error').hide();
+  });
+  
+  // Form submission success (AJAX example with Formspree)
+  $form.on('submit', function(e) {
+    e.preventDefault();
+    
+    $submitBtn.prop('disabled', true).text('Invio in corso...');
+    
+    $.ajax({
+      url: $form.attr('action'),
+      method: 'POST',
+      data: $form.serialize(),
+      headers: { 'Accept': 'application/json' }
+    })
+    .done(function(response) {
+      $form.trigger('reset');
+      $submitBtn.text('Messaggio Inviato!');
+      
+      // Show success message
+      $form.after('<div class="form-success">Grazie! Ti contatteremo presto.</div>');
+      
+      setTimeout(function() {
+        $submitBtn.prop('disabled', false).text('Invia Messaggio');
+        $('.form-success').fadeOut();
+      }, 3000);
+    })
+    .fail(function() {
+      $submitBtn.prop('disabled', false).text('Riprova');
+      $form.after('<div class="form-error">Errore nell\'invio. Riprova più tardi.</div>');
+    });
+  });
+});
+```
+
+### Back to Top Button
+
+```javascript
+$(function() {
+  const $backToTop = $('.back-to-top');
+  
+  // Show/hide on scroll
+  $(window).on('scroll', function() {
+    if ($(window).scrollTop() > 300) {
+      $backToTop.addClass('is-visible');
+    } else {
+      $backToTop.removeClass('is-visible');
+    }
+  });
+  
+  // Smooth scroll to top
+  $backToTop.on('click', function(e) {
+    e.preventDefault();
+    $('html, body').animate({
+      scrollTop: 0
+    }, 800);
+  });
+});
+```
+
+```html
+<!-- HTML for back to top -->
+<a href="#top" class="back-to-top" aria-label="Torna su">
+  <svg><!-- icon --></svg>
+</a>
+```
+
+```css
+.back-to-top {
+  position: fixed;
+  bottom: 32px;
+  right: 32px;
+  width: 48px;
+  height: 48px;
+  background: var(--color-primary);
+  color: white;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  opacity: 0;
+  visibility: hidden;
+  transition: all 0.3s ease;
+  z-index: 100;
+}
+
+.back-to-top.is-visible {
+  opacity: 1;
+  visibility: visible;
+}
+
+.back-to-top:hover {
+  background: var(--color-primary-dark);
+  transform: translateY(-4px);
+}
+```
+
+### Image Lazy Loading
+
+```javascript
+$(function() {
+  const $lazyImages = $('img[loading="lazy"]');
+  
+  // Native lazy loading support check
+  if ('loading' in HTMLImageElement.prototype) {
+    // Browser supports native lazy loading
+    $lazyImages.each(function() {
+      const src = $(this).data('src');
+      if (src) {
+        $(this).attr('src', src);
+      }
+    });
+  } else {
+    // Fallback for browsers without support
+    const imageObserver = new IntersectionObserver(function(entries, observer) {
+      entries.forEach(function(entry) {
+        if (entry.isIntersecting) {
+          const $img = $(entry.target);
+          const src = $img.data('src');
+          if (src) {
+            $img.attr('src', src);
+            $img.on('load', function() {
+              $img.addClass('is-loaded');
+            });
+          }
+          observer.unobserve(entry.target);
+        }
+      });
+    });
+    
+    $lazyImages.each(function() {
+      imageObserver.observe(this);
+    });
+  }
+});
+```
+
+---
+
+## GSAP Animations
+
+### Basic Animations
+
+```javascript
+$(function() {
+  // Fade in element
+  gsap.from('.hero h1', {
+    duration: 1,
+    opacity: 0,
+    y: 30,
+    ease: 'power3.out'
+  });
+  
+  // Stagger animation
+  gsap.from('.service-card', {
+    duration: 0.8,
+    opacity: 0,
+    y: 40,
+    stagger: 0.15,
+    ease: 'power3.out',
+    delay: 0.3
+  });
+  
+  // Multiple properties
+  gsap.from('.hero .btn', {
+    duration: 1,
+    opacity: 0,
+    y: 20,
+    scale: 0.95,
+    delay: 0.5,
+    ease: 'back.out(1.7)'
+  });
+});
+```
+
+### Timeline
+
+```javascript
+$(function() {
+  const tl = gsap.timeline({ defaults: { ease: 'power3.out' } });
+  
+  tl.from('.hero h1', {
+    duration: 1,
+    opacity: 0,
+    y: 50
+  })
+  .from('.hero-sub', {
+    duration: 0.8,
+    opacity: 0,
+    y: 30
+  }, '-=0.5')
+  .from('.hero .btn', {
+    duration: 0.6,
+    opacity: 0,
+    y: 20
+  }, '-=0.4')
+  .from('.logo-wall', {
+    duration: 1,
+    opacity: 0
+  }, '-=0.3');
+});
+```
+
+### ScrollTrigger Animations
+
+```javascript
+// Register ScrollTrigger
+gsap.registerPlugin(ScrollTrigger);
+
+$(function() {
+  // Fade in on scroll
+  gsap.utils.toArray('.fade-on-scroll').forEach(function(elem) {
+    gsap.to(elem, {
+      scrollTrigger: {
+        trigger: elem,
+        start: 'top 85%',
+        toggleActions: 'play none none none'
+      },
+      opacity: 1,
+      y: 0,
+      duration: 1,
+      ease: 'power3.out'
+    });
+  });
+  
+  // Slide in from left
+  gsap.utils.toArray('.slide-in-left').forEach(function(elem) {
+    gsap.from(elem, {
+      scrollTrigger: {
+        trigger: elem,
+        start: 'top 80%',
+        toggleActions: 'play none none none'
+      },
+      opacity: 0,
+      x: -50,
+      duration: 1,
+      ease: 'power3.out'
+    });
+  });
+  
+  // Slide in from right
+  gsap.utils.toArray('.slide-in-right').forEach(function(elem) {
+    gsap.from(elem, {
+      scrollTrigger: {
+        trigger: elem,
+        start: 'top 80%',
+        toggleActions: 'play none none none'
+      },
+      opacity: 0,
+      x: 50,
+      duration: 1,
+      ease: 'power3.out'
+    });
+  });
+  
+  // Scale up
+  gsap.utils.toArray('.scale-up').forEach(function(elem) {
+    gsap.from(elem, {
+      scrollTrigger: {
+        trigger: elem,
+        start: 'top 85%',
+        toggleActions: 'play none none none'
+      },
+      opacity: 0,
+      scale: 0.8,
+      duration: 1,
+      ease: 'back.out(1.7)'
+    });
+  });
+  
+  // Parallax effect
+  gsap.to('.parallax-bg', {
+    scrollTrigger: {
+      trigger: '.hero',
+      start: 'top top',
+      end: 'bottom top',
+      scrub: true
+    },
+    y: 100,
+    ease: 'none'
+  });
+  
+  // Pin section (sticky)
+  gsap.to('.sticky-section', {
+    scrollTrigger: {
+      trigger: '.sticky-section',
+      start: 'top top',
+      end: '+=100%',
+      pin: true,
+      scrub: true
+    }
+  });
+});
+```
+
+### Hover Animations
+
+```javascript
+$(function() {
+  // Card hover with GSAP
+  const $cards = $('.service-card');
+  
+  $cards.each(function() {
+    const $card = $(this);
+    
+    $card.on('mouseenter', function() {
+      gsap.to($card, {
+        duration: 0.3,
+        y: -8,
+        boxShadow: '0 12px 32px rgba(0, 0, 0, 0.15)',
+        ease: 'power2.out'
+      });
+    });
+    
+    $card.on('mouseleave', function() {
+      gsap.to($card, {
+        duration: 0.3,
+        y: 0,
+        boxShadow: '0 2px 8px rgba(0, 0, 0, 0.08)',
+        ease: 'power2.out'
+      });
+    });
+  });
+  
+  // Button hover
+  const $buttons = $('.btn');
+  
+  $buttons.each(function() {
+    const $btn = $(this);
+    
+    $btn.on('mouseenter', function() {
+      gsap.to($btn, {
+        duration: 0.2,
+        scale: 1.05,
+        ease: 'power2.out'
+      });
+    });
+    
+    $btn.on('mouseleave', function() {
+      gsap.to($btn, {
+        duration: 0.2,
+        scale: 1,
+        ease: 'power2.out'
+      });
+    });
+  });
+});
+```
+
+### Complex Animation Sequence
+
+```javascript
+$(function() {
+  const tl = gsap.timeline({
+    scrollTrigger: {
+      trigger: '.feature-section',
+      start: 'top 70%',
+      toggleActions: 'play none none none'
+    }
+  });
+  
+  tl.from('.feature-section h2', {
+    duration: 0.8,
+    opacity: 0,
+    y: 30,
+    ease: 'power3.out'
+  })
+  .from('.feature-section p', {
+    duration: 0.6,
+    opacity: 0,
+    y: 20
+  }, '-=0.4')
+  .from('.feature-grid .feature-card', {
+    duration: 0.6,
+    opacity: 0,
+    y: 40,
+    stagger: 0.1,
+    ease: 'back.out(1.7)'
+  }, '-=0.3')
+  .from('.feature-section .btn', {
+    duration: 0.5,
+    opacity: 0,
+    scale: 0.9
+  }, '-=0.3');
+});
+```
+
+---
+
+## Performance Best Practices
+
+### Reduce Motion
+
+```javascript
+// Check for reduced motion preference
+const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+
+if (prefersReducedMotion) {
+  // Disable GSAP animations
+  gsap.globalTimeline.timeScale(0);
+  
+  // Or set duration to 0
+  gsap.defaults({ duration: 0 });
+}
+```
+
+### Debounce Scroll Events
+
+```javascript
+// Debounce function
+function debounce(func, wait) {
+  let timeout;
+  return function executedFunction(...args) {
+    const later = () => {
+      clearTimeout(timeout);
+      func(...args);
+    };
+    clearTimeout(timeout);
+    timeout = setTimeout(later, wait);
+  };
+}
+
+// Usage
+$(window).on('scroll', debounce(function() {
+  // Scroll logic here
+}, 100));
+```
+
+### Use CSS for Simple Animations
+
+```css
+/* Prefer CSS transitions for simple hover effects */
+.btn {
+  transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+
+.btn:hover {
+  transform: translateY(-2px);
+}
+
+/* Use GSAP only for complex animations */
+```
+
+---
+
+## Accessibility
+
+### Respect User Preferences
+
+```javascript
+// Check reduced motion
+const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+
+if (!prefersReducedMotion) {
+  // Initialize animations
+  initAnimations();
+}
+
+function initAnimations() {
+  // GSAP animations here
+}
+```
+
+### Focus Management
+
+```javascript
+// Trap focus in mobile menu
+function trapFocus($element) {
+  const $focusable = $element.find('a, button, input, textarea, select, [tabindex]:not([tabindex="-1"])');
+  const $first = $focusable.first();
+  const $last = $focusable.last();
+  
+  $element.on('keydown', function(e) {
+    if (e.key === 'Tab') {
+      if (e.shiftKey) {
+        if (document.activeElement === $first[0]) {
+          e.preventDefault();
+          $last.focus();
+        }
+      } else {
+        if (document.activeElement === $last[0]) {
+          e.preventDefault();
+          $first.focus();
+        }
+      }
+    }
+  });
+}
+```
+
+---
+
+## Checklist Interattività
+
+- [ ] Mobile menu toggle funzionante
+- [ ] Smooth scroll per anchor links
+- [ ] FAQ accordion accessibile
+- [ ] Form validation con feedback
+- [ ] Back to top button (se pagine lunghe)
+- [ ] Lazy loading immagini
+- [ ] GSAP animations (hero, scroll)
+- [ ] Hover effects su cards/buttons
+- [ ] Respect reduced motion preference
+- [ ] Keyboard navigation testata
+- [ ] No console errors
+- [ ] Performance ottimizzata (debounce, CSS where possible)
+
+---
+
+_References per agency-web-developer skill_