* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

#app {
  height: 100vh;
  width: 100vw;
}

.grid-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-auto-rows: 1fr;
  width: 100%;
  height: 100%;
  gap: 2px;
}

@media (min-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.camera-cell {
  position: relative;
  background: #111;
  overflow: hidden;
  cursor: pointer;
}

.camera-cell .video-js,
.camera-cell video {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.camera-cell .vjs-tech {
  object-fit: cover !important;
}

/* Скрыть стандартные элементы video.js, которые мешают в сетке */
.camera-cell .vjs-big-play-button {
  display: none !important;
}

.camera-cell .vjs-loading-spinner {
  opacity: 0.6;
}

.camera-label {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 14px;
  z-index: 10;
  pointer-events: none;
  user-select: none;
}

.back-btn {
  display: none;
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 20;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}

.back-btn:hover {
  background: rgba(0, 0, 0, 0.9);
}

/* Кнопка назад видна только в fullscreen */
.camera-cell:fullscreen .back-btn,
.camera-cell:-webkit-full-screen .back-btn,
.camera-cell:-moz-full-screen .back-btn,
.camera-cell:-ms-fullscreen .back-btn {
  display: block;
}