#checkout-processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: all;
    opacity: 0;
    transition: opacity 0.2s ease;
}

#checkout-processing-overlay.show {
    opacity: 1;
}

#checkout-processing-overlay .overlay-content {
    background: #fff;
    padding: 40px 60px;
    border-radius: 8px;
    text-align: center;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    box-sizing: border-box;
}

@media (max-width: 600px) {
    #checkout-processing-overlay .overlay-content {
        padding: 20px 30px;
    }
}

#checkout-processing-overlay .overlay-content h2 {
    margin: 20px 0 10px;
    font-size: 24px;
    color: #333;
}

#checkout-processing-overlay .overlay-content p {
    margin: 0;
    font-size: 16px;
    color: #666;
}

#checkout-processing-overlay .spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
    box-sizing: border-box;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}