/* Advertisement styles shared by regular pages and standalone exercises. */
.ad-container {
    background: #f8f9fa;
    color: var(--text-primary, #212529);
    border: 1px solid #e9ecef;
    border-radius: 0.5rem;
    padding: 1rem;
    text-align: center;
    margin: 1.5rem 0;
}

.ad-container small {
    display: block;
    color: var(--text-secondary, #6c757d);
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
}

.ad-container img {
    max-width: 100%;
    height: auto;
}

.ad-container iframe {
    max-width: 100%;
}

.ad-sidebar {
    position: sticky;
    top: 100px;
}