explain this app, solve any problems improve it and make it more clever: <html><head><base href="." /><title>Personalized Recipe & Meal Planner</title>
<meta charset="UTF-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" integrity="sha512-p1xxxxxxx" crossorigin="anonymous" referrerpolicy="no-referrer" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/3.3.4/vue.global.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
<style>
:root {
    --primary: #2c3e50;
    --secondary: #e74c3c;
    --accent: #3498db;
    --light: #ecf0f1;
    --dark: #2c3e50;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--light);
    color: var(--dark);
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: var(--primary);
    font-size: 2.5em;
}

.ingredient-input {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.ingredient-input input {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--accent);
    border-radius: 5px;
    font-size: 1em;
}

.ingredient-input button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.ingredient-input button:hover {
    background: #2980b9;
}

.ingredients-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.ingredient-tag {
    background: var(--light);
    padding: 5px 10px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.ingredient-tag button {
    background: none;
    border: none;
    color: var(--secondary);
    cursor: pointer;
    font-size: 0.8em;
}

.recipe-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.recipe-card {
    background: white;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.recipe-card h3 {
    color: var(--primary);
    margin-top: 0;
}

.recipe-image {
    width: 100%;
    height: 200px;
    border-radius: 5px;
    margin-bottom: 10px;
    overflow: hidden;
}

.recipe-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.loading {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

.nutrition-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 10px;
    font-size: 0.9em;
}

.nutrition-item {
    background: var(--light);
    padding: 5px;
    border-radius: 5px;
    text-align: center;
}

.dietary-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.dietary-filter {
    background: white;
    border: 2px solid var(--accent);
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.dietary-filter.active {
    background: var(--accent);
    color: white;
}

.generate-recipes {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1em;
    margin: 20px 0;
    transition: background 0.3s;
}

.generate-recipes:hover {
    background: #c0392b;
}

.recipe-instructions {
    margin-top: 15px;
    padding: 10px;
    background: var(--light);
    border-radius: 5px;
}

.recipe-instructions h4 {
    color: var(--primary);
    margin-top: 0;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-spinner {
    color: white;
    font-size: 2em;
    animation: spin 1s infinite linear;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
</style>
</head>
<body>
<div id="app" class="app-container">
    <div class="header">
        <h1>🥗 Recipe & Meal Planner</h1>
    </div>

    <div class="dietary-filters">
        <button 
            v-for="filter in dietaryFilters" 
            :key="filter"
            :class="['dietary-filter', { active: activeFilters.includes(filter) }]"
            @click="toggleFilter(filter)">
            {{ filter }}
        </button>
    </div>

    <div class="ingredient-input">
        <input 
            v-model="newIngredient" 
            @keyup.enter="addIngredient"
            placeholder="Enter available ingredients...">
        <button @click="addIngredient">Add</button>
    </div>

    <div class="ingredients-list">
        <div v-for="ingredient in ingredients" :key="ingredient" class="ingredient-tag">
            {{ ingredient }}
            <button @click="removeIngredient(ingredient)">×</button>
        </div>
    </div>

    <button class="generate-recipes" @click="generateCustomRecipes" :disabled="isLoading">
        Generate Custom Recipes
    </button>

    <div class="recipe-container">
        <div v-for="recipe in filteredRecipes" :key="recipe.id" class="recipe-card">
            <div class="recipe-image">
                <img :src="recipe.imageUrl" :alt="`Image of ${recipe.name}, styled with professional food photography`" :class="{ loading: !recipe.imageLoaded }" @load="recipe.imageLoaded = true">
            </div>
            <h3>{{ recipe.name }}</h3>
            <p>{{ recipe.description }}</p>
            <div class="nutrition-info">
                <div class="nutrition-item">
                    Calories: {{ recipe.calories }}
                </div>
                <div class="nutrition-item">
                    Protein: {{ recipe.protein }}g
                </div>
                <div class="nutrition-item">
                    Carbs: {{ recipe.carbs }}g
                </div>
                <div class="nutrition-item">
                    Fat: {{ recipe.fat }}g
                </div>
            </div>
            <div class="recipe-instructions" v-if="recipe.instructions">
                <h4>Instructions:</h4>
                <p>{{ recipe.instructions }}</p>
            </div>
        </div>
    </div>

    <div v-if="isLoading" class="loading-overlay">
        <div class="loading-spinner">⚡</div>
    </div>
</div>

<script>
const { createApp } = Vue

createApp({
    data() {
        return {
            newIngredient: '',
            ingredients: [],
            dietaryFilters: ['Vegetarian', 'Vegan', 'Gluten-Free', 'Keto', 'Low-Carb'],
            activeFilters: [],
            recipes: [],
            isLoading: false,
            retryCount: 0,
            maxRetries: 3
        }
    },
    computed: {
        filteredRecipes() {
            if (this.activeFilters.length === 0) return this.recipes;
            return this.recipes.filter(recipe => 
                this.activeFilters.every(filter => recipe.dietary.includes(filter))
            );
        }
    },
    methods: {
        addIngredient() {
            if (this.newIngredient.trim() && !this.ingredients.includes(this.newIngredient)) {
                this.ingredients.push(this.newIngredient.trim());
                this.newIngredient = '';
            }
        },
        removeIngredient(ingredient) {
            this.ingredients = this.ingredients.filter(i => i !== ingredient);
        },
        toggleFilter(filter) {
            if (this.activeFilters.includes(filter)) {
                this.activeFilters = this.activeFilters.filter(f => f !== filter);
            } else {
                this.activeFilters.push(filter);
            }
        },
        async generateCustomRecipes() {
            if (this.ingredients.length === 0) {
                alert('Please add some ingredients first!');
                return;
            }

            this.isLoading = true;
            this.retryCount = 0;
            await this.attemptRecipeGeneration();
        },
        async attemptRecipeGeneration() {
            try {
                const dietaryRestrictions = this.activeFilters.join(', ');
                const ingredients = this.ingredients.join(', ');
                
                const prompt = `Create a recipe using these ingredients: ${ingredients}. 
                               ${dietaryRestrictions ? `Must be ${dietaryRestrictions}.` : ''}
                               Include exact measurements and cooking times.
                               Response must be valid JSON with structure:
                               {
                                 "name": "Recipe Name",
                                 "description": "Brief description",
                                 "instructions": "Detailed steps",
                                 "calories": number,
                                 "protein": number,
                                 "carbs": number,
                                 "fat": number,
                                 "dietary": ["array", "of", "restrictions"]
                               }`;
                
                const response = await axios.post('https://your-valid-api-endpoint.com/generate-recipe', {
                    messages: [
                        { 
                            role: 'system', 
                            content: 'You are a professional chef and nutritionist. Respond with complete, valid JSON recipe data only.' 
                        },
                        { role: 'user', content: prompt }
                    ],
                    jsonMode: true
                }, {
                    timeout: 30000 // 30 seconds timeout
                });

                if (response.status !== 200) {
                    throw new Error(`HTTP error! status: ${response.status}`);
                }

                const data = response.data;
                
                let recipe;
                try {
                    recipe = typeof data.content === 'string' ? JSON.parse(data.content) : data.content;
                } catch (parseError) {
                    console.error('JSON Parse Error:', parseError);
                    throw new Error('Invalid recipe data format received');
                }

                if (!this.validateRecipeData(recipe)) {
                    throw new Error('Incomplete or invalid recipe data received');
                }

                const imagePrompt = `${recipe.name}, food photography, professional lighting, overhead shot, high resolution, detailed texture`;
                const imageUrl = `https://image.pollinations.ai/prompt/${encodeURIComponent(imagePrompt)}?width=400&height=400&nologo=true`;

                this.recipes.unshift({
                    id: Date.now(),
                    imageUrl,
                    imageLoaded: false,
                    ...recipe
                });

                this.isLoading = false;

            } catch (error) {
                console.error('Error generating recipe:', error);
                
                if (error.code === 'ECONNABORTED') {
                    alert('Request timed out. Please try again.');
                    this.isLoading = false;
                    return;
                }
                
                if (this.retryCount < this.maxRetries) {
                    this.retryCount++;
                    console.log(`Retry attempt ${this.retryCount} of ${this.maxRetries}`);
                    await new Promise(resolve => setTimeout(resolve, 2000 * this.retryCount)); // Exponential backoff
                    await this.attemptRecipeGeneration();
                } else {
                    this.addMockRecipe();
                    this.isLoading = false;
                    alert('Failed to generate recipe using AI. Displaying a sample recipe.');
                }
            }
        },
        validateRecipeData(recipe) {
            const required = ['name', 'description', 'instructions', 'calories', 'protein', 'carbs', 'fat', 'dietary'];
            return required.every(field => {
                if (Array.isArray(recipe[field])) {
                    return recipe[field].length > 0;
                }
                return recipe[field] !== undefined && recipe[field] !== null && recipe[field] !== '';
            });
        },
        addMockRecipe() {
            const mockRecipe = {
                id: Date.now(),
                name: "Spaghetti Aglio e Olio",
                description: "A simple yet flavorful Italian pasta dish.",
                instructions: "1. Boil spaghetti.\n2. Sauté garlic in olive oil.\n3. Toss spaghetti with garlic oil.\n4. Season with salt, pepper, and parsley.",
                calories: 400,
                protein: 12,
                carbs: 50,
                fat: 15,
                dietary: ["Vegetarian"],
                imageUrl: "https://via.placeholder.com/400x400.png?text=Spaghetti+Aglio+e+Olio",
                imageLoaded: true
            };
            this.recipes.unshift(mockRecipe);
        }
    }
}).mount('#app')
</script>
</body>
</html>