/* Shared "bordered popover" shape across four anchored-panel components:
.toc-overlay-panel (article_toc/article_toc_overlay.css),
.block-style-mini-panel (article_editor/article_block_panel.css),
.quick-style-panel (article_editor/article_quick_style.css),
.position-info-panel (../union/union_position_info.css).

Only genuinely-identical declarations are lifted here -- position (two are
position:absolute, two are position:fixed), border-radius (10px on
.block-style-mini-panel vs 12px on the other three) and box-shadow
(var(--color-shadow) vs the stronger var(--color-shadow-strong) on the two
fixed panels) all differ per file and stay as per-file overrides. */
.toc-overlay-panel,
.block-style-mini-panel,
.quick-style-panel,
.position-info-panel {
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
}

/* shared header row (title + close/minimize button) -- the margin below
the row differs per file and stays local. */
.toc-overlay-header,
.block-style-mini-panel-header,
.quick-style-panel-header,
.position-info-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* shared title basics -- font-size/color (muted vs. secondary-accent vs.
inherited) differ per file and stay local. */
.toc-overlay-title,
.block-style-mini-panel-title,
.quick-style-panel-title,
.position-info-title {
  margin: 0;
  font-weight: bold;
}

/* shared base for each panel's own close/minimize button -- the two visual
treatments (bordered text chip on toc-overlay/position-info vs. circular
icon button on block-style/quick-style) differ per file and stay local. */
.toc-overlay-close,
.block-style-close,
.quick-style-minimize,
.position-info-close {
  flex: 0 0 auto;
  cursor: pointer;
}