/* Shared, responsive placement for Yandex RTB blocks. */
.site-ad {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  margin: 22px auto;
  overflow: hidden;
  clear: both;
  text-align: center;
  border-radius: 12px;
}
.site-ad > div { max-width: 100%; margin-inline: auto; }
.site-ad iframe { max-width: 100%; }
.site-ad--top { margin-top: 14px; margin-bottom: 22px; }
.site-ad--middle { margin-top: 26px; margin-bottom: 26px; }
.site-ad--bottom { margin-top: 26px; margin-bottom: 18px; }
@media (max-width: 640px) {
  .site-ad { margin: 16px auto; border-radius: 10px; }
  .site-ad--middle, .site-ad--bottom { margin-top: 20px; margin-bottom: 20px; }
}