.card-pricing.popular {
    z-index: 1;
    border: 3px solid #007bff;
}
.card-pricing .list-unstyled li {
    padding: .5rem 0;
    color: #6c757d;
}
    
.panel-heading {
    padding: 15px;
    background-color: #337ab7; /* Bootstrap's primary blue for heading */
    color: white;
    border-bottom: 1px solid transparent; /* Remove default border */
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
}
.panel-heading .panel-title {
    margin: 0;
    font-size: 18px;
}
.panel-body .price {
    font-size: 2em; /* Adjust price font size */
    margin-top: 20px;
    margin-bottom: 20px;
    color: #337ab7; /* Bootstrap's primary blue for price */
}
.panel-body .price small {
    font-size: 0.4em;
    color: #777; /* Default text muted color */
}
.list-group-item {
    border: none; /* Remove borders between list items */
    padding: 8px 15px;
}
.panel-footer {
    padding: 15px;
    background-color: #f5f5f5; /* Light grey background for footer */
    border-top: 1px solid #ddd; /* Separator for footer */
}
.panel-primary > .panel-heading {
    background-color: #337ab7;
    border-color: #337ab7;
}
.panel-primary .panel-body .price {
    color: #337ab7;
}
/* Simulate border around the selected Professional card */
.panel-primary {
    border: 2px solid #337ab7;
    box-shadow: 0 0 10px rgba(0,0,0,.1); /* Simple shadow for selected card */
}
.btn-default {
    color: #337ab7;
    background-color: #fff;
    border-color: #337ab7;
}
.btn-default:hover,
.btn-default:focus {
    color: #fff;
    background-color: #337ab7;
    border-color: #337ab7;
}