body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    background-color: #f4f4f4;
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: #fff;
    border-bottom: 1px solid #ddd;
}

.top-nav .logo-container {
    display: flex;
    align-items: center;
}

.top-nav .logo {
    height: 40px;
    margin-right: 10px;
}

.top-nav h1 {
    font-size: 24px;
    margin: 0;
}

.top-nav nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.top-nav nav li {
    margin-left: 20px;
}

.top-nav nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.top-nav nav a.active {
    color: #007bff;
    border-bottom: 2px solid #007bff;
}

main {
    padding: 20px;
    padding-bottom: 80px; /* Space for bottom nav */
}

#product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.product-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
}

.product-card img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.product-card h3 {
    font-size: 18px;
    margin: 10px 0;
}

.product-card p {
    color: #666;
    font-size: 14px;
}

.product-card .price {
    font-size: 16px;
    font-weight: 500;
    color: #333;
    margin-top: 10px;
}

.product-card button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #fff;
    border-top: 1px solid #ddd;
    padding: 10px 0;
}

.bottom-nav nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-around;
}

.bottom-nav nav a {
    text-decoration: none;
    color: #333;
    font-size: 12px;
    text-align: center;
}

.bottom-nav nav a.active {
    color: #007bff;
}