.site-ad { box-sizing: border-box; overflow: hidden; margin: 12px auto; text-align: center; }
.site-ad a, .site-ad picture, .site-ad img { display: block; }
.site-ad a { color: inherit; text-decoration: none; }
.site-ad img { width: 100%; height: auto; object-fit: contain; }
.site-ad-header, .site-ad-below { width: 100%; max-width: 1100px; min-height: 90px; }
.site-ad-below { margin-top: 24px; margin-bottom: 24px; }
.painting-ad-layout.has-ad { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 16px; align-items: start; }
.painting-ad-main { min-width: 0; }
.site-ad-painting_side { width: 300px; min-height: 250px; margin: 0; position: sticky; top: 12px; }
@media (max-width: 1100px) {
    .painting-ad-layout.has-ad { display: block; }
    .site-ad-painting_side { width: 100%; max-width: 700px; min-height: 90px; margin: 14px auto; position: static; }
}
@media (max-width: 700px) {
    .site-ad { min-height: 0; }
    .site-ad-header, .site-ad-below, .site-ad-painting_side { margin-top: 8px; margin-bottom: 8px; }
}