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

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1em;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px;
}

.product {
    background-color: white;
    padding: 20px;
    text-align: center;
    border: 1px solid #ddd;
    border-radius: 8px;
}

.buy-btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 5px;
}

.buy-btn:hover {
    background-color: #45a049;
}

/* Modal Styles */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1; 
    left: 0;
    top: 0;
    width: 100%;
    height: 100%; 
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 400px;
    position: relative;
}

.close {
    position: absolute;
    top: 10px;
    right: 15px;
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
}

.close:hover, .close:focus {
    color: black;
    cursor: pointer;
}

#chat-box {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#chat-content {
    height: 200px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    margin-bottom: 10px;
}

#user-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#send-btn {
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

#send-btn:hover {
    background-color: #0056b3;
}