iframe {
    width: 100%;
    border: none;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    padding: 24px;
}

/* loading spinner */
.iframe-loading {
    position: relative;
}

.iframe-loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px;
    border: 4px solid rgba(0,0,0,.1);
    border-top-color: rgba(0,0,0,.5);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 10;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}