* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    padding: 20px;
}

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

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.product-card {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.product-card h3 {
    margin-bottom: 15px;
    color: #444;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.calculate-btn {
    display: block;
    width: 200px;
    margin: 0 auto;
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-bottom: 30px;
}

.calculate-btn:hover {
    background-color: #0056b3;
}

.results, .product-results {
    margin-top: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.product-results {
    margin-bottom: 30px;
}

.results h2, .product-results h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.result-item {
    text-align: center;
    padding: 15px;
    background-color: white;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.result-item h3 {
    color: #666;
    margin-bottom: 10px;
    font-size: 16px;
}

.result-item span {
    font-size: 20px;
    font-weight: bold;
    color: #007bff;
}

.product-results {
    border-left: 4px solid #007bff;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .calculate-btn {
        width: 100%;
    }
}