@layer components {
  .bn-builder {
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 32rem;
    border: 1px solid var(--bn-color-border, #2a2a2e);
    border-radius: var(--bn-radius-md, 0.5rem);
    background: var(--bn-color-surface-1, #18181b);
    color: var(--bn-color-text, #f4f4f5);
    font-family: var(--bn-font-family, system-ui, sans-serif);
    overflow: hidden;
  }
  .bn-builder__toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.625rem 0.75rem;
    border-block-end: 1px solid var(--bn-color-border, #2a2a2e);
    background: var(--bn-color-surface-2, #1f1f23);
  }
  .bn-builder__btn {
    appearance: none;
    border: 1px solid var(--bn-color-border, #2a2a2e);
    background: var(--bn-color-surface-3, #27272d);
    color: inherit;
    padding: 0.4rem 0.75rem;
    border-radius: var(--bn-radius-sm, 0.375rem);
    font: inherit;
    cursor: pointer;
  }
  .bn-builder__btn:hover {
    background: var(--bn-color-surface-4, #2f2f37);
  }
  .bn-builder__btn:focus-visible {
    outline: 2px solid var(--bn-color-accent, #6366f1);
    outline-offset: 2px;
  }
  .bn-builder__panes {
    display: grid;
    grid-template-columns: 14rem 1fr 18rem;
    min-height: 28rem;
  }
  @media (max-width: 880px) {
    .bn-builder__panes {
      grid-template-columns: 1fr;
      grid-auto-rows: minmax(14rem, auto);
    }
  }
  .bn-builder__pane {
    border-inline-end: 1px solid var(--bn-color-border, #2a2a2e);
    overflow: auto;
    padding: 0.75rem;
  }
  .bn-builder__pane:last-child {
    border-inline-end: 0;
  }
  .bn-builder__pane--canvas {
    background: var(--bn-color-surface-0, #0d0d10);
    padding: 1rem;
  }
  .bn-builder__canvas-surface {
    min-height: 100%;
    min-width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    border: 1px dashed var(--bn-color-border-subtle, #2a2a2e);
    border-radius: var(--bn-radius-sm, 0.375rem);
    padding: 1rem;
  }
  .bn-builder__canvas-surface:focus-visible {
    outline: 2px solid var(--bn-color-accent, #6366f1);
    outline-offset: 2px;
  }
  .bn-builder__empty {
    display: grid;
    place-items: center;
    min-height: 12rem;
    color: var(--bn-color-text-muted, #a1a1aa);
    font-style: italic;
    border: 1px dashed var(--bn-color-border-subtle, #2a2a2e);
    border-radius: var(--bn-radius-sm, 0.375rem);
    padding: 1.5rem;
  }
  .bn-builder__canvas-surface [data-bn-node] {
    position: relative;
    border: 1px solid transparent;
    border-radius: var(--bn-radius-sm, 0.375rem);
    padding: 0.5rem;
  }
  .bn-builder__canvas-surface [data-bn-node]:hover,
  .bn-builder__canvas-surface [data-bn-hover='true'] {
    border-color: var(--bn-color-accent-soft, #4338ca);
  }
  .bn-builder__canvas-surface [data-bn-selected='true'] {
    border-color: var(--bn-color-accent, #6366f1);
    box-shadow: 0 0 0 1px var(--bn-color-accent, #6366f1) inset;
  }

  .bn-palette {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  .bn-palette__heading {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--bn-color-text-muted, #a1a1aa);
    margin-block-end: 0.4rem;
  }
  .bn-palette__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }
  .bn-palette__btn {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.4rem 0.5rem;
    border: 1px solid var(--bn-color-border, #2a2a2e);
    background: var(--bn-color-surface-2, #1f1f23);
    color: inherit;
    border-radius: var(--bn-radius-sm, 0.375rem);
    cursor: grab;
    text-align: start;
    font: inherit;
  }
  .bn-palette__btn:hover {
    background: var(--bn-color-surface-3, #27272d);
  }
  .bn-palette__btn:active {
    cursor: grabbing;
  }
  .bn-palette__type {
    font-family: var(--bn-font-family-mono, ui-monospace, monospace);
    font-size: 0.7rem;
    color: var(--bn-color-text-muted, #a1a1aa);
  }
  .bn-palette__empty {
    color: var(--bn-color-text-muted, #a1a1aa);
    font-style: italic;
  }

  .bn-builder-tree {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }
  .bn-builder-tree__heading {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--bn-color-text-muted, #a1a1aa);
  }
  .bn-builder-tree [data-bn-tree-id] {
    padding: 0.25rem 0.4rem;
    border-radius: var(--bn-radius-sm, 0.375rem);
    cursor: pointer;
  }
  .bn-builder-tree [data-bn-tree-id]:hover,
  .bn-builder-tree [data-bn-tree-hover='true'] {
    background: var(--bn-color-surface-3, #27272d);
  }
  .bn-builder-tree [data-bn-tree-selected='true'] {
    background: var(--bn-color-accent-soft, #4338ca);
    color: var(--bn-color-text-on-accent, #f4f4f5);
  }

  .bn-inspector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  .bn-inspector__heading {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--bn-color-text-muted, #a1a1aa);
  }
  .bn-inspector__field {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }
  .bn-inspector__label {
    font-size: 0.75rem;
    color: var(--bn-color-text-muted, #a1a1aa);
  }
  .bn-inspector__input,
  .bn-inspector__select {
    appearance: none;
    border: 1px solid var(--bn-color-border, #2a2a2e);
    background: var(--bn-color-surface-2, #1f1f23);
    color: inherit;
    padding: 0.35rem 0.5rem;
    border-radius: var(--bn-radius-sm, 0.375rem);
    font: inherit;
    width: 100%;
  }
  .bn-inspector__empty {
    color: var(--bn-color-text-muted, #a1a1aa);
    font-style: italic;
  }
}