.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: #0c0c0c;
}

.titlebar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 12px;
  background: #1a1a1a;
  border-bottom: 1px solid #2a2a2a;
  font-size: 12px;
  color: #aaa;
  user-select: none;
}
.titlebar .label {
  font-weight: 600;
  color: #ddd;
}

.distros, .presets {
  display: flex;
  gap: 4px;
  align-items: center;
}
.distro-btn, .preset-btn, .palette-btn {
  font: inherit;
  font-family: "Cascadia Mono", "JetBrains Mono", "Consolas", monospace;
  font-size: 11px;
  background: #222;
  color: #aaa;
  border: 1px solid #333;
  border-radius: 3px;
  padding: 2px 8px;
  cursor: pointer;
}
.distro-btn:hover, .preset-btn:hover, .palette-btn:hover {
  background: #2a2a2a;
  color: #ddd;
}
.distro-btn.active {
  background: #1a3a5c;
  color: #cce6ff;
  border-color: #2a5a8c;
}
.palette-btn.bcast-all.on {
  background: #4a3010;
  color: #f0c060;
  border-color: #c98a1f;
}
.palette-btn.bcast-all.on.partial {
  background: #2a2010;
  color: #c98a1f;
}
.palette-btn.mcp-btn.on {
  background: #1a3a1a;
  color: #80e080;
  border-color: #2a6a2a;
}
.preset-btn {
  min-width: 28px;
  text-align: center;
}
.muted {
  color: #666;
  font-style: italic;
}
.layout-info {
  margin-left: auto;
  font-family: "Cascadia Mono", "JetBrains Mono", "Consolas", monospace;
  color: #777;
  font-size: 11px;
}
.layout-info .idle-info {
  color: #d96060;
}

.pane-wrap {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

/* 2px padding on each leaf slot creates a 4px gap between adjacent panes —
   so per-pane borders (idle red, active blue, broadcasting orange) read as
   distinct rectangles instead of merging into a continuous grid pattern. */
.leaf-slot {
  padding: 2px;
  box-sizing: border-box;
}