* { box-sizing: border-box; }
html, body, #app { width: 100%; height: 100%; margin: 0; font-family: Arial, sans-serif; background: #121212; color: #eee; }
#app { display: flex; }
#leftPane { flex: 4; position: relative; background: #202020; }
#graphCanvas { width: 100%; height: 100%; display: block; }
#infoPanel {
  position: absolute; left: 15px; bottom: 15px;
  background: rgba(30,30,30,0.86); color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px; padding: 10px; font-family: monospace; font-size: 11px;
  white-space: pre;
}
#sidebar { flex: 1; min-width: 340px; max-width: 420px; padding: 12px; overflow: auto; background: #181818; color: #eee; }
#search { width: 100%; padding: 8px; margin-bottom: 8px; background: #252525; color: #eee; border: 1px solid #444; }
#selectedLabel { font-weight: bold; margin-bottom: 10px; color: #fff; }
.sectionHead { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.sectionHead h3 { font-size: 14px; margin: 10px 0 6px; color: #ddd; }
.list { list-style: none; margin: 0; padding: 0; border: 1px solid #333; min-height: 90px; max-height: 220px; overflow: auto; background: #1f1f1f; }
.list li { padding: 6px 8px; border-bottom: 1px solid #333; cursor: pointer; font-size: 13px; color: #ddd; }
.list li:last-child { border-bottom: none; }
.list li.active { background: #233b55; color: #fff; }
#relayoutBtn { margin-top: 10px; width: 100%; padding: 8px; background: #252525; color: #eee; border: 1px solid #444; }
#busyOverlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.55);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: bold; z-index: 9999;
}