/* ───────────────────────────────────────────────────────────
   Floating popovers — Layers / Particles / Helpers / BG color.
   Anchored to a button via anchoredPopover.js.
   The .popover class is a base style; #-selectors override.
   ─────────────────────────────────────────────────────────── */

.popover,
#layers-panel,
#particles-panel,
#helpers-panel {
  position: fixed;
  z-index: 50;
  min-width: 232px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;

  padding: 10px 12px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--r);
  box-shadow: var(--shadow-3);

  opacity: 0;
  transform: translateX(-6px);
  pointer-events: none;
  transition:
    opacity var(--motion-fast),
    transform var(--motion-fast);
}
#layers-panel.open,
#particles-panel.open,
#helpers-panel.open,
.popover.open {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

/* ── Header row (title + quick actions) ────────────────── */
.layers-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 2px 4px 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--divider);
}
.layers-title {
  font: 600 9.5px/1 var(--font);
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.layers-quick {
  display: flex;
  gap: 4px;
}
.layers-qbtn {
  padding: 3px 9px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font: 500 10px var(--font);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    color var(--motion-fast),
    border-color var(--motion-fast),
    background var(--motion-fast);
}
.layers-qbtn:hover {
  color: var(--bright);
  background: var(--surface-hover);
  border-color: var(--border-strong);
}
.layer-sep {
  border: 0;
  border-top: 1px solid var(--divider);
  margin: 8px 4px;
}

/* ── Tree row ──────────────────────────────────────────── */
.layer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 6px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  cursor: default;
  transition:
    background var(--motion-fast),
    border-color var(--motion-fast);
}
.layer-row:hover {
  background: var(--surface-hover);
}
.layer-row-parent {
  cursor: pointer;
}
.layer-twist {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: transform var(--motion-fast);
}
.layer-twist svg {
  width: 12px;
  height: 12px;
}
.layer-group.expanded > .layer-row-parent > .layer-twist {
  transform: rotate(90deg);
}
.layer-group:not(.expanded) > .layer-row:not(:first-child),
.layer-group:not(.expanded) > .layer-group {
  display: none;
}

/* Tree indentation — VSCode-style guide lines. */
.layer-row-child {
  padding-left: 22px;
  position: relative;
}
.layer-row-child::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--divider);
}
.layer-row-child .layer-dot {
  width: 6px;
  height: 6px;
  opacity: 0.7;
}
.layer-row-child .layer-name {
  font-size: 11px;
}

.layer-row-grandchild {
  padding-left: 38px;
  position: relative;
}
.layer-row-grandchild::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--divider);
}
.layer-row-grandchild .layer-dot {
  width: 5px;
  height: 5px;
  opacity: 0.55;
}
.layer-row-grandchild .layer-name {
  font-size: 10.5px;
  letter-spacing: 0.02em;
}
.layer-row-grandchild .layer-sub {
  font-size: 10px;
}

.layer-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.layer-info {
  flex: 1;
  min-width: 0;
}
.layer-name {
  font: 500 11.5px var(--mono);
  color: var(--bright);
  letter-spacing: 0.04em;
}
.layer-sub {
  font: 400 10.5px var(--font);
  color: var(--muted);
  margin-top: 1px;
}

/* ─────────────────────────────────────────────────────────
   Background-color picker — small SV / Hue picker popover.
   ───────────────────────────────────────────────────────── */
#bgcolor-popover {
  width: 264px;
  padding: 12px 14px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--r);
  box-shadow: var(--shadow-3);
}
.bgcp-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--divider);
}
.bgcp-title {
  font: 600 9.5px/1 var(--font);
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.bgcp-close {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  color: var(--muted);
  transition:
    color var(--motion-fast),
    background var(--motion-fast);
}
.bgcp-close:hover {
  color: var(--bright);
  background: var(--surface-hover);
}

.bgcp-canvas-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  height: 144px;
}
.bgcp-sv {
  flex: 1;
  position: relative;
  border-radius: var(--r-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: crosshair;
  touch-action: none;
  background: #ff0000;
  background-image:
    linear-gradient(to top, #000 0%, rgba(0, 0, 0, 0) 100%),
    linear-gradient(to right, #fff 0%, rgba(255, 255, 255, 0) 100%);
}
.bgcp-sv-cursor {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.55),
    0 2px 4px rgba(0, 0, 0, 0.6);
  transform: translate(-50%, -50%);
  pointer-events: none;
  left: 50%;
  top: 50%;
}
.bgcp-hue {
  width: 14px;
  position: relative;
  border-radius: var(--r-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: ns-resize;
  touch-action: none;
  background: linear-gradient(
    to bottom,
    #ff0000 0%,
    #ffff00 17%,
    #00ff00 33%,
    #00ffff 50%,
    #0000ff 67%,
    #ff00ff 83%,
    #ff0000 100%
  );
}
.bgcp-hue-cursor {
  position: absolute;
  left: -3px;
  right: -3px;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(0, 0, 0, 0.6);
  transform: translateY(-50%);
  pointer-events: none;
  top: 0;
}

.bgcp-preview {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}
.bgcp-swatch {
  width: 38px;
  height: 30px;
  flex-shrink: 0;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: #0e1014;
}
.bgcp-hex {
  flex: 1;
  min-width: 0;
  padding: 7px 10px;
  border-radius: var(--r-sm);
  background: rgba(0, 0, 0, 0.32);
  border: 1px solid var(--border);
  color: var(--bright);
  font: 500 12px var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: border-color var(--motion-fast);
}
.bgcp-hex:focus {
  border-color: var(--accent);
}

.bgcp-presets-hdr {
  margin-top: 6px;
  margin-bottom: 6px;
  font: 600 9.5px/1 var(--font);
  color: var(--muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.bgcp-presets {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.bgcp-preset {
  width: 24px;
  height: 24px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
  transition:
    transform var(--motion-fast),
    border-color var(--motion-fast),
    box-shadow var(--motion-fast);
}
.bgcp-preset:hover {
  transform: scale(1.08);
  border-color: var(--accent);
}
.bgcp-preset.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.bgcp-reset {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--r);
  background: var(--accent-soft);
  border: 1px solid var(--accent-edge);
  color: var(--accent-text);
  font: 500 11px var(--font);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition:
    background var(--motion-fast),
    color var(--motion-fast),
    border-color var(--motion-fast);
}
.bgcp-reset:hover {
  background: rgba(99, 152, 255, 0.18);
  color: var(--bright);
  border-color: var(--accent);
}