.wc-error-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    z-index: 9999;
}

.wc-error-popup .popup-content {
    background: #fff;
    color: #333;
    max-width: 500px;
    margin: 10% auto;
    padding: 20px 30px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
    position: relative;
    text-align: left;
}

.wc-error-popup h3 {
    margin-bottom: 10px;
    font-size: 20px;
    color: #d00;
}

.wc-error-popup ul {
    margin: 0;
    padding-left: 20px;
}

.wc-error-popup .close-popup {
    display: block;
    margin: 15px auto 0;
    padding: 8px 18px;
    background: #d00;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.wc-error-popup .close-popup:hover {
    background: #b00;
}