#app {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
}

.main-area {
  flex: 1;
  display: flex;
  min-height: 0;
}

.side-panel {
  width: 300px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid #fff;
}

.panel-resizer {
  width: 5px;
  flex-shrink: 0;
  cursor: col-resize;
  background: transparent;
}

.panel-resizer:hover,
.panel-resizer.dragging {
  background: #666;
}

.timeline-area {
  flex: 1;
  position: relative;
  min-width: 0;
  overflow: hidden;
}

.vertical-scrollbar {
  width: 14px;
  flex-shrink: 0;
  position: relative;
  background: #0a0a0a;
  border-left: 1px solid #333;
  border-right: 1px solid #333;
}

.scrollbar-thumb {
  position: absolute;
  left: 2px;
  right: 2px;
  background: #666;
  border-radius: 5px;
  cursor: grab;
}

.scrollbar-thumb:hover {
  background: #888;
}

.scrollbar-thumb:active {
  cursor: grabbing;
  background: #aaa;
}