:root {
  --bg: #1a1a2e;
  --text: #ffffff;
  --panel-bg: #16213e;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#panels {
  display: grid;
  gap: 2px;
  width: 100%;
  height: 100%;
}

.panel {
  background: var(--panel-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.panel.empty {
  opacity: 0.3;
}

.panel-label {
  position: absolute;
  bottom: 6px;
  left: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: #e2e8f0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  z-index: 10;
  pointer-events: none;
  text-align: center;
}

.panel.empty::after {
  content: 'No video';
  color: #64748b;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
}

.panel video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}