/* Collapsible panels (panel_open()/panel_close() in builder.php). */
.panel-header { display: flex; align-items: center; gap: 0.6rem; cursor: pointer; user-select: none; margin: calc(-1 * var(--net-spacing-lg)); margin-bottom: 0; padding: var(--net-spacing-md) var(--net-spacing-lg); border-radius: var(--net-border-radius-md) var(--net-border-radius-md) 0 0; }
.panel-header:hover { background: var(--net-bg-accent); }
.panel-header:focus-visible { outline: 2px solid var(--net-color-primary); outline-offset: -2px; }
.panel-header h2 { margin: 0; flex: 1 1 auto; }
.panel-header .panel-caret { color: var(--net-color-primary); font-size: 0.8rem; min-width: 1.2em; text-align: center; }
.panel-header .panel-actions { display: flex; gap: var(--net-spacing-sm); }
.panel-body { padding-top: var(--net-spacing-md); }
.card.is-collapsed .panel-header { margin-bottom: calc(-1 * var(--net-spacing-lg)); border-radius: var(--net-border-radius-md); }