body {
    display: grid;
    grid-template-columns: 70% 30%;
    max-width: 1200px;
    margin: 0 auto;
    font-family: Arial, sans-serif;
    gap: 20px;
}

header, nav {
    text-align: center;
    grid-column: 1 / span 2;
}

header {
    padding: 20px;
    background-color: #f4f4f4;
}

nav {
    padding: 10px;
    background-color: #ddd;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

.product-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    grid-column: 1;
}

.product-card {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
    border-radius: 5px;
}

.product-card img {
    max-width: 100%;
    height: auto;
}

.product-detail {
    grid-column: 1;
    padding: 20px;
    border: 1px solid #eee;
}

.product-detail img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    display: block;
    margin-bottom: 20px;
}

.sidebar {
    grid-column: 2;
    background-color: #f9f9f9;
    padding: 10px;
    height: fit-content;
}

.footer {
    text-align: center;
    padding: 20px;
    grid-column: 1 / span 2;
    display: grid;
    grid-template-columns: 1fr;
    background-color: #333;
    color: white;
    margin-top: 20px;
}

.item {
    padding: 10px;
}

.button {
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    color: white;
    background-color: #000;
}

.button1 { border-radius: 2px; }
.button2 { border-radius: 8px; }
.button3 { border-radius: 12px; }
.button4 { border-radius: 5px;}
@media (max-width: 768px) {
    body {
        grid-template-columns: 1fr;
    }

    header, nav, .product-list, .product-detail, .sidebar, .footer {
        grid-column: 1;
    }

    .product-list {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) {
    .footer {
        grid-template-columns: repeat(3, 1fr);
    }
}