body {
  font-family: Arial, sans-serif;
  background: #222;
  color: #eee;
  margin: 0;
  padding: 20px;
  text-align: center;
}

h1 {
  font-size: 2.5em;
  margin-bottom: 20px;
  color: #4caf50;
  text-shadow: 0 0 10px #4caf50;
}

h2 {
  font-size: 2em;
  margin-top: -10px;
  margin-bottom: 20px;
  color: #4caf50;
  text-shadow: 0 0 8px #4caf50;
}

#buttons {
  margin-bottom: 20px;
}

#buttons a,
#buttons button {
  background-color: #444;
  border: none;
  color: white;
  padding: 10px 18px;
  margin: 5px;
  font-size: 1em;
  cursor: pointer;
  border-radius: 5px;
  transition: background-color 0.3s;
  text-decoration: none;
  display: inline-block;
  margin: 5px;
}

#buttons a:hover,
#buttons a.active,
#buttons button:hover,
#buttons button.active {
  background-color: #4caf50;
  color: #222;
  font-weight: bold;
}

#singleStream,
#mosaic {
  max-width: 900px;
  margin: 0 auto;
}

video {
  width: 100%;
  height: auto;
  max-height: 480px;
  background: black;
  border-radius: 6px;
  box-shadow: 0 0 10px #000;
}

#mosaic {
  display: none;
  gap: 8px;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 200px;
  justify-items: center;
  align-items: center;
  margin-top: 10px;
}

#mosaic video {
  width: 100%;
  height: 100%;
  max-height: none;
  border-radius: 6px;
  box-shadow: 0 0 8px #000;
}