body {
  margin: 0;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

#viewer {
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
}

#controlsOverlay {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 8px;
  max-width: 300px;
}

.annotation {
  position: absolute;
  background: rgba(255, 255, 255, 0.8);
  color: #333;
  padding: 8px 12px;
  border-radius: 6px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  pointer-events: none;
  z-index: 1000;
  font-size: 14px;
  font-weight: bold;
  text-align: center;
}

#controlsPanel {
  pointer-events: auto;
  background: rgba(240, 240, 240, 0.9);
  border-radius: 8px;
  padding: 15px;
  max-width: 400px;
}

#controlsPanel summary {
  cursor: pointer;
  user-select: none;
  padding: 10px;
  background: #4CAF50;
  color: white;
  border-radius: 4px;
  font-weight: bold;
}

.controls-group {
  margin-bottom: 15px;
}

.controls-group h4 {
  margin: 10px 0 5px 0;
  color: #333;
}

.view-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button {
  padding: 8px 12px;
  cursor: pointer;
  border: none;
  border-radius: 4px;
  background: #666;
  color: white;
  font-size: 12px;
  transition: background 0.3s;
}

button:hover {
  background: #888;
}

input[type="file"] {
  padding: 8px;
  border-radius: 4px;
  width: 100%;
  margin-bottom: 8px;
}