body {
  font-family: Arial, sans-serif;
  background-color: #fff;
  color: #111;
  margin: 0;
  padding: 0;
  direction: rtl;
}
@media (prefers-color-scheme: dark) {
  body { background-color: #121212; color: #eee; }
}
header {
  background: #333; color: #fff; padding: 1em; text-align: center;
}
main#videoGrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1em;
  padding: 1em;
}
#videoGrid div {
  background: #f0f0f0;
  padding: 1em;
  border-radius: 10px;
  transition: transform 0.2s ease;
}
@media (prefers-color-scheme: dark) {
  #videoGrid div { background: #1e1e1e; }
}
#videoGrid div:hover { transform: scale(1.02); }
#videoGrid video {
  width: 100%;
  max-height: 200px;
  cursor: pointer;
  border-radius: 8px;
}
#videoModal {
  display: none;
  position: fixed;
  z-index: 999;
  left: 0; top: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.85);
  justify-content: center;
  align-items: center;
}
#videoModal video {
  max-width: 90%;
  max-height: 80%;
  border-radius: 10px;
}
#videoModal .close {
  position: absolute;
  top: 20px; left: 30px;
  font-size: 2em;
  color: #fff;
  cursor: pointer;
}