/* ============================================================
   Builder chrome (unlayered, always wins over the framework).
   Three panes: palette | canvas | inspector. The canvas itself is a
   plain .vui scope: everything inside it is the framework rendering
   the user's blocks, untouched except for the selection/drop cues.
   ============================================================ */

html,
body {
  background: var(--bg-void);
}

.builder {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr) 19rem;
  gap: var(--space-5);
  align-items: start;
  padding: var(--space-5);
}

/* Phones/tablets: stack the panes; the canvas leads. */
@media (max-width: 63.999rem) {
  .builder {
    grid-template-columns: 1fr;
  }
  .builder-stage {
    order: -1;
    position: static;
    block-size: auto;
  }
  .builder-canvas {
    min-block-size: 60svh;
  }
}

/* ---------- Palette ---------- */
.builder-palette,
.builder-inspector {
  position: sticky;
  inset-block-start: calc(var(--frame-header-h) + 16px);
  max-block-size: calc(100svh - var(--frame-header-h) - 32px);
  overflow-y: auto;
  padding: var(--space-4);
  border: var(--border-hair) solid var(--hairline);
  background-color: var(--surface-panel);
}

.builder-palette > .label,
.builder-inspector .label {
  margin-block: 0 6px;
}

.builder-hint {
  margin-block: 0 10px;
  color: var(--text-faint);
  font-size: var(--fs-2xs);
  font-family: var(--font-mono);
  line-height: 1.5;
}

.palette-group {
  margin-block-end: var(--space-4);
}

.palette-group > .label {
  margin-block: var(--space-3) 4px;
  color: var(--text-faint);
}

.palette-items {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.palette-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-block: 5px;
  padding-inline: 8px;
  border: var(--border-hair) solid var(--hairline-strong);
  background-color: color-mix(in srgb, var(--cyan-400) 5%, transparent);
  color: var(--text-secondary);
  font-size: var(--fs-2xs);
  font-family: var(--font-display);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  cursor: grab;
}

.palette-item i {
  color: var(--text-faint);
  font-size: var(--fs-md);
}

.palette-item:hover {
  border-color: var(--hairline-accent);
  color: var(--accent);
}

.palette-item:hover i {
  color: var(--accent);
}

.palette-item[aria-disabled='true'] {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ---------- Canvas ----------
   The stage is a sticky pane that fills the viewport; the canvas scrolls its
   own content. The live HTML readout lives under the inspector (right column)
   so the build area gets the full stage width. */
.builder-stage {
  min-inline-size: 0;
  position: sticky;
  inset-block-start: calc(var(--frame-header-h) + 16px);
  block-size: calc(100svh - var(--frame-header-h) - 32px);
}

/* The canvas is an <iframe>: a real viewport so position:fixed docks and width
   media queries fire inside it. The frame paints its own grid backdrop and the
   selection/drop cues (see builder-frame.css); the element itself is just the
   framed, scrolling window. */
.builder-canvas {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  border: var(--border-hair) solid var(--hairline-strong);
  background-color: var(--bg-base);
  color-scheme: dark;
}

/* ---------- Live HTML tree (right column, under the inspector) ----------
   A draggable outline of the generated HTML: reorder or reparent any node by
   dragging it here, which is often more precise than aiming in the canvas. */
.builder-code {
  margin-block-start: var(--space-4);
  border: var(--border-hair) solid var(--hairline-strong);
  background-color: var(--ink-1000);
}

.builder-code > summary {
  padding-block: 8px;
  padding-inline: 12px;
  border-block-end: var(--border-hair) solid var(--hairline);
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: var(--fs-2xs);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
}

.builder-code-live {
  margin-inline-start: 8px;
  padding-block: 1px;
  padding-inline: 6px;
  border: var(--border-hair) solid var(--hairline-accent);
  color: var(--accent);
  font-size: var(--fs-2xs);
  letter-spacing: var(--ls-wide);
  text-transform: none;
}

.ctree {
  max-block-size: 46svh;
  overflow: auto;
  padding-block: 8px;
  padding-inline: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  line-height: 1.55;
  white-space: nowrap;
}

/* Nesting = indentation; the guide line hints at the tree depth. */
.ctree-children {
  padding-inline-start: 12px;
  margin-inline-start: 4px;
  border-inline-start: var(--border-hair) solid var(--hairline);
}

.ctree-line,
.ctree-textline {
  padding-inline: 4px;
  border-radius: 2px;
}

.ctree-textline {
  color: var(--text-secondary);
  white-space: normal;
  overflow-wrap: anywhere;
}

.ctree-row {
  cursor: grab;
}

.ctree-row > .ctree-line:hover {
  background-color: color-mix(in srgb, var(--accent) 12%, transparent);
}

.ctree-row.is-sel > .ctree-line {
  background-color: color-mix(in srgb, var(--accent) 20%, transparent);
  outline: 1px solid var(--accent);
}

/* Drop cues: a rule before/after a line, or an outline for "drop inside". */
.ct-before {
  box-shadow: inset 0 2px 0 0 var(--green-500);
}

.ct-after {
  box-shadow: inset 0 -2px 0 0 var(--green-500);
}

.ctree-row.ct-inside > .ctree-line {
  outline: 1px dashed var(--green-500);
  background-color: color-mix(in srgb, var(--green-500) 12%, transparent);
}

.ctree-row.ct-bad > .ctree-line {
  outline: 1px dashed var(--red-500);
}

/* ---------- Inspector ---------- */
.insp-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-block-end: 6px;
}

.insp-title code {
  font-size: var(--fs-xs);
}

.insp-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-block-end: var(--space-4);
}

.insp-section {
  margin-block-end: var(--space-4);
}

.insp-section > .label {
  margin-block: 0 6px;
  color: var(--text-faint);
}

.insp-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.insp-chip {
  padding-block: 3px;
  padding-inline: 8px;
  border: var(--border-hair) solid var(--hairline-strong);
  background: transparent;
  color: var(--text-muted);
  font-size: var(--fs-2xs);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  cursor: pointer;
}

.insp-chip:hover {
  border-color: var(--hairline-accent);
  color: var(--text-secondary);
}

.insp-chip.is-on {
  border-color: var(--accent);
  background-color: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
}

/* chip tones follow the compat kinds */
.insp-chip[data-kind='tone'].is-on {
  border-color: var(--amber-500);
  background-color: color-mix(in srgb, var(--amber-500) 14%, transparent);
  color: var(--amber-400);
}

.insp-knob {
  display: grid;
  gap: 3px;
  margin-block-end: 8px;
}

.insp-knob > code {
  color: var(--text-muted);
  font-size: var(--fs-2xs);
}

.insp-knob > input {
  padding-block: 6px;
  padding-inline: 10px;
  font-size: var(--fs-xs);
}

.insp-empty {
  color: var(--text-faint);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
}

/* ---------- Problems ---------- */
#problems {
  margin-block-start: var(--space-4);
}

.problem-row {
  display: block;
  inline-size: 100%;
  min-inline-size: 0;
  padding-block: 6px;
  padding-inline: 8px;
  border: 0;
  border-inline-start: 2px solid var(--red-500);
  background-color: color-mix(in srgb, var(--red-500) 7%, transparent);
  color: var(--red-400);
  font-size: var(--fs-2xs);
  font-family: var(--font-mono);
  line-height: 1.45;
  text-align: start;
  white-space: normal;
  overflow-wrap: anywhere;
  cursor: pointer;
}

.problem-row + .problem-row {
  margin-block-start: 4px;
}

.problems-clear {
  color: var(--green-500);
  font-size: var(--fs-2xs);
  font-family: var(--font-mono);
}

/* ---------- Export dialog ---------- */
#export-dialog {
  max-inline-size: min(94vw, 46rem);
}

#export-dialog pre {
  max-block-size: 50svh;
  overflow: auto;
}

/* Builder toast for refusals ("impossible" feedback). */
.builder-toast {
  position: fixed;
  z-index: 9999;
  inset-block-end: var(--space-6);
  inset-inline-start: 50%;
  translate: -50% 0;
  padding-block: 10px;
  padding-inline: 16px;
  border: var(--border-hair) solid var(--red-500);
  background-color: var(--bg-void);
  color: var(--red-400);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  box-shadow: 0 0 24px -6px var(--red-glow);
}