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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for accessibility */
button:focus,
a:focus,
[tabindex]:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* Loading state */
.loading {
    text-align: center;
    padding: 2rem;
    font-size: 1.1rem;
    color: #666;
}

/* Improved button styles for different types */
.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

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

.btn-danger {
    background-color: #dc3545;
    border-color: #dc3545;
}

.btn-danger:hover {
    background-color: #c82333;
    border-color: #bd2130;
}

.btn-remove {
    background-color: #6c757d;
    border-color: #6c757d;
}

.btn-remove:hover {
    background-color: #545b62;
    border-color: #4e555b;
}

.navbar {
    background: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: rgba(255,255,255,0.1);
}

.cart-link {
    background-color: #e74c3c;
    border-radius: 20px;
}

#app {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.product-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.product-image {
    width: 100%;
    height: 200px;
    background-color: #ecf0f1;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 3rem;
    color: #95a5a6;
}

.product-name {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.product-price {
    font-size: 1.1rem;
    color: #e74c3c;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.product-description {
    color: #666;
    margin-bottom: 1rem;
}

.btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-success {
    background-color: #27ae60;
}

.btn-success:hover {
    background-color: #219a52;
}

.back-btn {
    background-color: #95a5a6;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 2rem;
}

.back-btn:hover {
    background-color: #7f8c8d;
}

.product-detail {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.product-detail .product-image {
    height: 300px;
    margin-bottom: 2rem;
}

.product-detail .product-name {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.product-detail .product-price {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.product-detail .product-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.cart-items {
    margin-bottom: 2rem;
}

.cart-item {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.cart-item-price {
    color: #e74c3c;
    font-weight: bold;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.quantity-btn {
    background-color: #ecf0f1;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quantity-btn:hover {
    background-color: #d5dbdb;
}

.cart-total {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    text-align: right;
}

.total-amount {
    font-size: 1.5rem;
    font-weight: bold;
    color: #e74c3c;
    margin-bottom: 1rem;
}

.empty-cart {
    text-align: center;
    padding: 3rem;
    color: #666;
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .cart-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .cart-item-controls {
        width: 100%;
        justify-content: space-between;
    }
}