body {
  font-family: system-ui, sans-serif;
  margin: 2rem;
  background: #f9f9f9;
}

video {
  width: 100%;
  max-width: 960px;
  background: #000;
  aspect-ratio: 16/9;
  display: block;
  margin: 0 auto;
}

.ads {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.ad {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
  text-align: center;
}

.ad h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.ad p {
  margin: 0.5rem 0;
  color: #555;
}

.ad img {
  max-width: 100%;
  max-height: 150px;
  height: auto;
  width: auto;
  display: block;
  margin: 0 auto;
}

header, footer {
  text-align: center;
  margin-bottom: 1rem;
}