main {
  margin-top: 15px;
}

.app-layout {
  display: grid;
  /* Columns: Brushes | Canvas (800px) | Observables */
  grid-template-columns: 100px 800px 400px;
  /* Rows: Controls | Main content */
  grid-template-rows: min-content min-content;

  gap: 5px;
  background-color: var(--bg-app);
  min-height: 100vh;

  justify-content: center;
  align-content: start;
}

.controls {
  grid-column: 2; /* Center column */
  display: flex;
  align-items: center;
  gap: 15px;
  color: var(--text-main);
  padding-bottom: 10px;
}

.canvas-container {
  grid-column: 2;
  height: 600px; /* Force the canvas height here */
}

.canvas-container canvas {
  background: #000;
  cursor: crosshair;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);

  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
}

.brushes-panel {
  grid-column: 1;
  grid-row: 2; /* Sits next to the canvas */
  align-self: start;
}

.side-panel {
  grid-column: 3;
  grid-row: 2; /* Sits next to the canvas */
  align-self: start;
}

/* --- Buttons --- */
.btn {
  background: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
}

/* --- Checkboxes & Labels --- */
.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  color: var(--text-dim);
}

.toggle input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--accent-sub-label); /* Modern browsers will use your blue for the check */
}


/* --- Top Stats --- */
.top-stats {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  display: inline-block;
  min-width: 50px;
}



.top-nav {
  display: flex;
  align-items: center;
  background-color: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 10px;
  font-size: 12px;
  color: var(--text-toolbar);
}

/* Simple Select Styling */
.system-dropdown {
  background-color: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 1px 4px;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
}

.system-dropdown:hover {
  border-color: var(--accent-sub-label);
}

.system-dropdown:focus {
  outline: 1px solid var(--accent-sub-label);
}