* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

header h1 {
    text-align: center;
}

.categories-grid, .subcategories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    padding: 1rem;
    margin-bottom: 2rem;
}

.category-tile, .subcategory-tile {
    background-color: #444;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem;
    font-size: 1.3rem;
}

.category-tile:hover, .subcategory-tile:hover {
    background-color: #666;
    transform: translateY(-5px);
}

.category-tile.active, .subcategory-tile.active {
    background-color: #007bff;
}

.category-tile i, .subcategory-tile i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.back-button {
    background-color: #444;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    margin-bottom: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-button:hover {
    background-color: #666;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.product-card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-image {
    width: 100%;
    height: 256px;
    object-fit: cover;
    background-color: #eee;
}

.product-info {
    padding: 1rem;
}

.product-name {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.product-price {
    font-size: 1.2rem;
    color: #007bff;
    font-weight: bold;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.payment-select {
    padding: 0.5rem;
    border-radius: 4px;
    background-color: white;
    border: 1px solid #ddd;
    font-size: 1rem;
}

.product-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
}

.quantity-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-btn {
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    width: 30px;
    height: 30px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.quantity-display {
    font-size: 1.1rem;
    min-width: 40px;
    text-align: center;
}

.buy-btn {
    flex: 1;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.buy-btn:hover {
    background-color: #218838;
}

.buy-btn:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}