feat: implement Phase 5 Swipe Discovery Carousel

.agents/TODO.md

@@ -24,7 +24,7 @@ Dieses Dokument enthält den aktuellen Entwicklungsstand und detaillierte Aufgab
   - Admin-Erweiterung für Step-Videos
   - Fullscreen Cooking-Mode Overlay (mit Lenis scroll lock)
   - Timers & Looping Video Players pro Zubereitungsschritt
-- [ ] **Phase 5: Sleek Swipe Discovery (Personalisiertes Empfehlungskarussell)**
+- [x] **Phase 5: Sleek Swipe Discovery (Personalisiertes Empfehlungskarussell)**
   - Touch-Swipe-Karussell direkt auf index.php (unter Landing-Page)
   - Filteralgorithmus nach Benutzer-Ernährungszielen
   - Mikro-Animationen & Quick-Save Funktion
@@ -123,18 +123,18 @@ Ein immersiver Kochmodus, der Anwendern Schritt-für-Schritt durch die Zubereitu
 ### 🎡 Phase 5: Sleek Swipe Discovery (Empfehlungskarussell)
 Ein hochgradig interaktives, touch-freundliches Karussell direkt auf der Startseite, das Nutzern Rezepte basierend auf ihren Zielen empfiehlt.
 
-- [ ] **Karussell-Architektur & Integration**
-  - [ ] Touch-Swipe Karussell Container direkt unter der Landing-Page (vor `#basics`) auf `index.php` einbetten
-  - [ ] CSS-Klammern (`clamp()`) für responsive Skalierung der Karten
-  - [ ] Flüssiges Einblenden per Scroll-Reveal (`reveal-target`) mit Anbindung an `LenisSmoothScroll`
-- [ ] **Personalisiertes Goal-Matching**
-  - [ ] Falls der Benutzer eingeloggt ist, sein Ernährungsziel aus den Firebase-Profildaten abrufen
-  - [ ] Rezepte dynamisch filtern (z.B. High-Protein Rezepte bei Ziel "Muskelaufbau", Low-Carb Rezepte bei Ziel "Abnehmen")
-  - [ ] Personalisierte "Für dich empfohlen"-Badge auf den Karten anzeigen
-- [ ] **Mikro-Interaktionen & Quick-Save**
-  - [ ] Touch-Gesten-Unterstützung (Wischen zum Blättern mit sanftem Trägheits-Feedback)
-  - [ ] Quick-Save Button direkt auf den Karussell-Karten (Herzeffekt mit direktem Firebase Firestore Sync)
-  - [ ] Hover-Reveal-Effekte für Rezeptdetails (Zutaten-Vorschau oder Kochzeit-Highlight schiebt sich weich hoch)
+- [x] **Karussell-Architektur & Integration**
+  - [x] Touch-Swipe Karussell Container direkt unter der Landing-Page (vor `#basics`) auf `index.php` einbetten
+  - [x] CSS-Klammern (`clamp()`) für responsive Skalierung der Karten
+  - [x] Flüssiges Einblenden per Scroll-Reveal (`reveal-target`) mit Anbindung an `LenisSmoothScroll`
+- [x] **Personalisiertes Goal-Matching**
+  - [x] Falls der Benutzer eingeloggt ist, sein Ernährungsziel aus den Firebase-Profildaten abrufen
+  - [x] Rezepte dynamisch filtern (z.B. High-Protein Rezepte bei Ziel "Muskelaufbau", Low-Carb Rezepte bei Ziel "Abnehmen")
+  - [x] Personalisierte "Für dich empfohlen"-Badge auf den Karten anzeigen
+- [x] **Mikro-Interaktionen & Quick-Save**
+  - [x] Touch-Gesten-Unterstützung (Wischen zum Blättern mit sanftem Trägheits-Feedback)
+  - [x] Quick-Save Button direkt auf den Karussell-Karten (Herzeffekt mit direktem Firebase Firestore Sync)
+  - [x] Hover-Reveal-Effekte für Rezeptdetails (Zutaten-Vorschau oder Kochzeit-Highlight schiebt sich weich hoch)
 
 ---
 

assets/style.css

@@ -2213,3 +2213,134 @@ body.nav-open { overflow: hidden; }
   opacity: 0.3;
   cursor: not-allowed;
 }
+
+/* ── 23. PHASE 5: SWIPE DISCOVERY CAROUSEL ────────────────────── */
+.swipe-discovery {
+  padding: clamp(2rem, 5vw, 4rem) 0;
+  overflow: hidden;
+  background: var(--surface-2);
+}
+.swipe-discovery__header {
+  margin-bottom: 2.5rem;
+  align-items: center;
+  text-align: center;
+  padding: 0 var(--grid-margin);
+}
+.eyebrow-goal {
+  color: var(--color-accent-gold);
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.15em;
+  font-size: 0.75rem;
+}
+.swipe-track {
+  display: flex;
+  gap: var(--grid-gap);
+  padding: 0 var(--grid-margin) 2rem var(--grid-margin);
+  overflow-x: auto;
+  scroll-snap-type: x mandatory;
+  -webkit-overflow-scrolling: touch;
+  scrollbar-width: none;
+  cursor: grab;
+}
+.swipe-track::-webkit-scrollbar {
+  display: none;
+}
+.swipe-track.active {
+  cursor: grabbing;
+}
+.swipe-card {
+  flex: 0 0 clamp(280px, 60vw, 400px);
+  scroll-snap-align: center;
+  position: relative;
+  border-radius: var(--radius);
+  overflow: hidden;
+  background: var(--surface);
+  box-shadow: var(--shadow);
+  transition: transform 0.4s var(--ease-out-expo);
+  display: flex;
+  flex-direction: column;
+}
+.swipe-card__image {
+  position: relative;
+  width: 100%;
+  aspect-ratio: 4/3;
+  overflow: hidden;
+  display: block;
+}
+.swipe-card__image img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  transition: transform 0.6s var(--ease-out-expo);
+}
+.swipe-card:hover .swipe-card__image img {
+  transform: scale(1.05);
+}
+.swipe-card__image .btn-favorite {
+  position: absolute;
+  top: 1rem;
+  right: 1rem;
+  z-index: 10;
+  background: rgba(255, 255, 255, 0.9);
+  border: none;
+  border-radius: 50%;
+  width: 40px;
+  height: 40px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
+  transition: transform 0.3s var(--ease-overshoot), background 0.3s;
+}
+[data-theme="dark"] .swipe-card__image .btn-favorite {
+  background: rgba(0, 0, 0, 0.6);
+}
+.swipe-card__image .btn-favorite svg {
+  width: 20px;
+  height: 20px;
+  color: var(--muted);
+  transition: fill 0.3s, color 0.3s;
+}
+.swipe-card__image .btn-favorite.active svg {
+  fill: var(--color-terracotta);
+  color: var(--color-terracotta);
+}
+.swipe-card__body {
+  padding: 1.5rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+  background: var(--surface);
+  position: relative;
+  z-index: 2;
+}
+.swipe-card__badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  background: var(--accent-soft);
+  color: var(--color-accent-gold);
+  padding: 0.25rem 0.75rem;
+  border-radius: 20px;
+  font-size: 0.7rem;
+  font-weight: 700;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  margin-bottom: 0.5rem;
+  width: fit-content;
+}
+.swipe-card__body h3 {
+  font-size: clamp(1.2rem, 2vw, 1.5rem);
+  line-height: 1.2;
+}
+.swipe-card__body h3 a {
+  text-decoration: none;
+  color: var(--ink);
+}
+.swipe-card__body h3 a::before {
+  content: '';
+  position: absolute;
+  inset: 0;
+}

index.php

@@ -341,6 +341,18 @@ include __DIR__ . '/partials/head.php';
   </div>
 <?php endif; ?>
 
+<!-- Swipe Discovery Carousel -->
+<section class="swipe-discovery reveal-target" id="swipe-discovery" style="display: none;" data-section-name="<?php echo $lang === 'de' ? 'Für Dich' : 'For You'; ?>" aria-label="<?php echo $lang === 'de' ? 'Persönliche Empfehlungen' : 'Personal Recommendations'; ?>">
+  <div class="section-header section-header--stack swipe-discovery__header">
+    <p class="eyebrow eyebrow-goal" id="swipeGoalEyebrow"></p>
+    <h2 id="swipeGoalTitle"><?php echo $lang === 'de' ? 'Empfohlen für dich' : 'Recommended for you'; ?></h2>
+    <p id="swipeGoalSub"><?php echo $lang === 'de' ? 'Basierend auf deinem Ernährungsziel' : 'Based on your dietary goal'; ?></p>
+  </div>
+  <div class="swipe-track" id="swipeTrack">
+    <!-- Cards inserted by JS -->
+  </div>
+</section>
+
 <!-- Discover Shell: Search + Stats + Tags | Featured -->
 <section class="discover-shell reveal-target" id="basics" data-section-name="<?php echo $lang === 'de' ? 'Entdecken' : 'Discover'; ?>" aria-label="<?php echo $lang === 'de' ? 'Rezepte entdecken' : 'Discover recipes'; ?>">
   <div class="discover-shell__main">
@@ -495,6 +507,29 @@ include __DIR__ . '/partials/head.php';
 
 <?php include __DIR__ . '/partials/footer.php'; ?>
 
+<?php
+// Expose recipe data for JS filtering
+$recipesJson = json_encode(array_values(array_map(function($r) use ($lang) {
+    return [
+        'slug' => $r['slug'],
+        'title' => $r['title'],
+        'hero' => $r['hero'],
+        'difficulty' => $r['difficulty'],
+        'total_time' => (int)($r['total_time'] ?? 0),
+        'url' => '/recipe.php?slug=' . urlencode($r['slug']) . '&lang=' . $lang,
+        'tags' => $r['tags'] ?? [],
+        'category' => $r['category'] ?? ''
+    ];
+}, $localizedAll)));
+?>
+<script>
+  const indexRecipeBank = <?php echo $recipesJson; ?>;
+  const i18nGoal = {
+    'weight_loss': '<?php echo $lang === "de" ? "Abnehmen / Low-Carb" : "Weight Loss / Low-Carb"; ?>',
+    'muscle_gain': '<?php echo $lang === "de" ? "Muskelaufbau / High-Protein" : "Muscle Gain / High-Protein"; ?>',
+    'healthy': '<?php echo $lang === "de" ? "Gesund & Ausgewogen" : "Healthy & Balanced"; ?>'
+  };
+</script>
 
 <!-- ╔══════════════════════════════════════════════════════════════╗
      ║  JAVASCRIPT — Preloader, Lenis, GSAP Stage, Section Indicator ║
@@ -807,5 +842,125 @@ include __DIR__ . '/partials/head.php';
     });
   }
 
+  /* ───────────────────────────────────────────────────────────────
+     7. SWIPE DISCOVERY CAROUSEL
+  ─────────────────────────────────────────────────────────────── */
+  var swipeSec = document.getElementById('swipe-discovery');
+  var swipeTrack = document.getElementById('swipeTrack');
+  var swipeEyebrow = document.getElementById('swipeGoalEyebrow');
+  
+  function renderSwipeCarousel(recipes, goalLabel) {
+    if (!swipeSec || !swipeTrack || recipes.length === 0) return;
+    
+    swipeSec.style.display = 'block';
+    if (goalLabel) {
+      swipeEyebrow.textContent = goalLabel;
+    } else {
+      swipeEyebrow.textContent = '<?php echo $lang === "de" ? "Entdecken" : "Discover"; ?>';
+    }
+    
+    swipeTrack.innerHTML = '';
+    recipes.slice(0, 8).forEach(function(recipe) {
+      var card = document.createElement('article');
+      card.className = 'swipe-card';
+      card.innerHTML = `
+        <a href="${recipe.url}" class="swipe-card__image">
+          <img src="${recipe.hero}" alt="${recipe.title}" loading="lazy">
+          <button class="btn-favorite" data-slug="${recipe.slug}" aria-label="Save to favorites" onclick="event.preventDefault(); event.stopPropagation();">
+            <svg viewBox="0 0 24 24" stroke="currentColor" fill="none">
+              <path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"></path>
+            </svg>
+          </button>
+        </a>
+        <div class="swipe-card__body">
+          <div class="swipe-card__badge">
+            <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"></polygon></svg>
+            <?php echo $lang === "de" ? "Für dich empfohlen" : "Recommended for you"; ?>
+          </div>
+          <h3><a href="${recipe.url}">${recipe.title}</a></h3>
+          <div class="meta">
+            <span>⏱ ${recipe.total_time} min</span>
+            <span>🙂 ${recipe.difficulty}</span>
+          </div>
+        </div>
+      `;
+      swipeTrack.appendChild(card);
+    });
+
+    // Re-bind favorite states using existing global userFavSlugs sync
+    if (typeof updateHeartStates === 'function') {
+      updateHeartStates();
+    }
+    
+    // Add horizontal scroll mouse drag
+    let isDown = false;
+    let startX;
+    let scrollLeft;
+    
+    swipeTrack.addEventListener('mousedown', (e) => {
+      isDown = true;
+      swipeTrack.classList.add('active');
+      startX = e.pageX - swipeTrack.offsetLeft;
+      scrollLeft = swipeTrack.scrollLeft;
+    });
+    swipeTrack.addEventListener('mouseleave', () => {
+      isDown = false;
+      swipeTrack.classList.remove('active');
+    });
+    swipeTrack.addEventListener('mouseup', () => {
+      isDown = false;
+      swipeTrack.classList.remove('active');
+    });
+    swipeTrack.addEventListener('mousemove', (e) => {
+      if (!isDown) return;
+      e.preventDefault();
+      const x = e.pageX - swipeTrack.offsetLeft;
+      const walk = (x - startX) * 2; 
+      swipeTrack.scrollLeft = scrollLeft - walk;
+    });
+  }
+
+  // Hook into auth state
+  window.addEventListener('DOMContentLoaded', function() {
+    if (window.auth && window.db) {
+      window.auth.onAuthStateChanged(function(user) {
+        if (user) {
+          window.db.collection('users').doc(user.uid).get()
+            .then(function(doc) {
+              if (doc.exists) {
+                var goal = doc.data().goal;
+                var filtered = indexRecipeBank;
+                
+                if (goal === 'weight_loss') {
+                  filtered = indexRecipeBank.filter(r => 
+                    r.tags.some(t => t.toLowerCase().includes('low-carb') || t.toLowerCase().includes('diet')) || 
+                    (r.category && r.category.toLowerCase().includes('salad'))
+                  );
+                } else if (goal === 'muscle_gain') {
+                  filtered = indexRecipeBank.filter(r => 
+                    r.tags.some(t => t.toLowerCase().includes('high-protein') || t.toLowerCase().includes('meat') || t.toLowerCase().includes('fleisch'))
+                  );
+                } else if (goal === 'healthy') {
+                  filtered = indexRecipeBank.filter(r => 
+                    r.tags.some(t => t.toLowerCase().includes('vegetarian') || t.toLowerCase().includes('healthy'))
+                  );
+                }
+                
+                // fallback if empty
+                if (filtered.length === 0) filtered = indexRecipeBank;
+                
+                renderSwipeCarousel(filtered, i18nGoal[goal] || null);
+              }
+            });
+        } else {
+          // Default unauthenticated view
+          renderSwipeCarousel(indexRecipeBank, null);
+        }
+      });
+    } else {
+      renderSwipeCarousel(indexRecipeBank, null);
+    }
+  });
+
 })();
 </script>