body {
    font-family: 'Arial', sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 24px;
    background: #2d3652;
    margin: 0;
    padding: 16px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.3s;
}
nav ul li a:hover {
    background: #0055aa;
}
.page-section {
    display: none;
    padding: 32px;
    background: #fff;
    min-height: 60vh;
}
.page-section.active {
    display: block;
}
#product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}
.product-card {
    background: #eef2f6;
    border-radius: 7px;
    box-shadow: 0 2px 8px rgba(60,60,60,0.1);
    padding: 24px;
    text-align: center;
    position: relative;
}
.product-card img {
    max-width: 100%;
    border-radius: 4px;
}
.product-card h3 {
    margin: 8px 0;
}
.product-card .price {
    font-weight: bold;
    color: #0055aa;
}
.button {
    background: #0055aa;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 12px;
}
.button:hover {
    background: #222d4c;
}
#cart-items, #favorites-list {
    margin-top: 16px;
}
.cart-item, .favorite-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    border-bottom: 1px solid #ddd;
}
.cart-item img, .favorite-item img {
    width: 60px;
}
#cart-total {
    font-weight: bold;
    margin-top: 16px;
}
@media screen and (max-width: 600px) {
    nav ul { flex-direction: column; }
    #product-grid { grid-template-columns: 1fr; }
    .page-section { padding: 8px; }
}