body {
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    height: 100vh;
    margin: 0;
    background-color: #f4f7f6;
}

/* Product Grid */
#grid {
    flex: 2;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    padding: 20px;
}

.product-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.1s;
}

.product-card:active { transform: scale(0.95); }

/* Sidebar Cart */
#sidebar {
    flex: 1;
    background: #fff;
    border-left: 2px solid #ddd;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

#checkout-btn {
    background: #27ae60;
    color: white;
    border: none;
    padding: 15px;
    font-size: 1.2rem;
    border-radius: 8px;
    margin-top: auto;
    cursor: pointer;
}