/* Native topic disclosures retain the existing heading badges and reader theme. */
[data-ct-lesson-theme] .ct-reader-page .ct-builder-topic.ct-topic-collapsible {
    --ct-topic-padding: 29px 30px;
    --ct-topic-header: #f4f0fd;
    --ct-topic-control: #eee6ff;
    --ct-topic-accent: #6840ae;
    --ct-topic-border: #dcd3ed;
    padding: 0;
}
[data-ct-lesson-theme="dark"] .ct-reader-page .ct-builder-topic.ct-topic-collapsible {
    --ct-topic-header: #2d2140;
    --ct-topic-control: #3d2b57;
    --ct-topic-accent: #d9c2ff;
    --ct-topic-border: #513b68;
}
.ct-lesson-page .ct-topic-disclosure > summary.ct-topic-heading-band {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    margin: 0;
    padding: 10px 18px;
    background: var(--ct-topic-header);
    border: 0;
    list-style: none;
    cursor: pointer;
}
.ct-topic-disclosure > summary::-webkit-details-marker { display: none; }
.ct-topic-disclosure > summary::marker { content: ""; }
body.ct-lesson-page .ct-topic-collapsible .ct-topic-heading-badge {
    align-items: center;
    gap: 10px;
    border: 0;
    border-radius: 0;
    background: transparent;
    overflow: visible;
}
body.ct-lesson-page .ct-topic-collapsible .ct-topic-heading-badge h2.ct-topic-heading-title {
    gap: 2px;
    padding: 0;
    background: transparent;
}
body.ct-lesson-page .ct-topic-collapsible .ct-topic-heading-badge h2.ct-topic-heading-title > span[lang="ar"] {
    order: 1;
    color: var(--ct-heading-ink);
    font: 600 18px/1.35 "Cairo", sans-serif;
}
body.ct-lesson-page .ct-topic-collapsible .ct-topic-heading-badge h2.ct-topic-heading-title > span[lang="en"] {
    order: 0;
    color: var(--ct-topic-accent);
    font: 700 17px/1.35 "Inter", sans-serif;
}
body.ct-lesson-page .ct-topic-collapsible .ct-topic-heading-badge > .ct-topic-marker.ct-topic-number {
    align-self: center;
    flex-basis: 42px;
    width: 42px;
    height: 48px;
    min-width: 42px;
    min-height: 48px;
    padding: 5px;
    border: 1px solid var(--ct-topic-border);
    border-radius: 10px;
    background: var(--ct-topic-control);
    color: var(--ct-topic-accent);
    font-size: 14px;
}
.ct-lesson-page .ct-topic-disclosure > summary.ct-topic-heading-band::before { content: none; }
.ct-lesson-page .ct-topic-disclosure[open] > summary.ct-topic-heading-band {
    border-bottom: 1px solid var(--ct-topic-border);
}
.ct-topic-disclosure > summary:focus-visible {
    outline: 3px solid var(--ct-topic-accent);
    outline-offset: -4px;
}
.ct-topic-disclosure-toggle {
    display: grid;
    place-items: center;
    flex: 0 0 32px;
    width: 32px;
    height: 32px;
    border: 1px solid var(--ct-topic-border);
    border-radius: 50%;
    background: var(--ct-topic-control);
    color: var(--ct-topic-accent);
}
.ct-topic-disclosure-toggle svg { transition: transform 180ms ease; }
.ct-topic-disclosure[open] > summary .ct-topic-disclosure-toggle svg { transform: rotate(180deg); }
.ct-topic-disclosure > summary:hover .ct-topic-disclosure-toggle { border-color: currentColor; }
.ct-topic-disclosure-content {
    display: flow-root;
    padding: var(--ct-topic-padding);
    padding-block-start: 0;
}
[dir="rtl"] .ct-topic-disclosure > summary { text-align: right; }
[dir="ltr"] .ct-topic-disclosure > summary { text-align: left; }
@media (max-width: 600px) {
    [data-ct-lesson-theme] .ct-reader-page .ct-builder-topic.ct-topic-collapsible {
        --ct-topic-padding: 20px 18px;
    }
    .ct-lesson-page .ct-topic-disclosure > summary.ct-topic-heading-band {
        gap: 10px;
        padding: 8px 12px;
    }
}
@media (prefers-reduced-motion: reduce) {
    .ct-topic-disclosure-toggle svg { transition: none; }
}
@media print {
    .ct-topic-disclosure-toggle { display: none; }
}