WordPress 6.9 Accordion Block Anpassungen

PHP
<?php 

add_filter('render_block_core/accordion-item', function($html) {
    $svg_closed = '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 5v14M5 12h14"/></svg>';
    $svg_open   = '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M5 12h14"/></svg>';

    $icon = '<span class="accordion-icon accordion-icon--closed" aria-hidden="true">' . $svg_closed . '</span>'
          . '<span class="accordion-icon accordion-icon--open" aria-hidden="true">' . $svg_open . '</span>';

    return str_replace(
        '<span class="wp-block-accordion-heading__toggle-icon" aria-hidden="true">+</span>',
        $icon,
        $html
    );
});
CSS
.wp-block-accordion-item,
.wp-block-accordion-panel {
    margin-top: 0 !important;
}

.is-open .wp-block-accordion-panel {
    margin-bottom: 15px !important;
}

.wp-block-accordion-heading__toggle {
    padding-top: 0 !important;
    padding-bottom: 12px !important;
}

.is-open .wp-block-accordion-heading__toggle {
    padding-bottom: 6px !important;
}

.accordion-icon { 
    transition: opacity 0.3s, transform 0.3s;
}
.accordion-icon--open { 
    display: none; 
}

/* Geöffnet */
[aria-expanded="true"] .accordion-icon--closed { display: none; }
[aria-expanded="true"] .accordion-icon--open    { display: inline-block; }

/* Animation */
[aria-expanded="true"] .accordion-icon--open svg {
    animation: rotate-in 0.3s ease forwards;
}
@keyframes rotate-in {
    from { transform: rotate(-90deg); opacity: 0; }
    to   { transform: rotate(0deg);  opacity: 1; }
}