/* A playable demo, loaded only when the reader asks for it. */
.demo {
  position: relative;
  margin: 1.5rem 0;
  border: 1px solid var(--table-border-color, #555);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 2 / 1;
}
.demo img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: 0.55; }
.demo iframe { width: 100%; height: 100%; border: 0; display: block; }
.demo button {
  position: absolute; inset: 0; margin: auto;
  width: 14rem; height: 3.2rem;
  font: inherit; font-weight: 600;
  color: #fff; background: rgba(20, 20, 24, 0.85);
  border: 1px solid #888; border-radius: 4px; cursor: pointer;
}
.demo button:hover { background: rgba(50, 50, 58, 0.95); }
.demo .weight { position: absolute; left: 0; right: 0; bottom: 0.6rem; text-align: center; color: #bbb; font-size: 0.8rem; }