Generate CSS-only accordion (using <details>).
Section one content goes here.
Section two content goes here.
Section three content goes here.
.accordion details { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; margin-bottom: 8px; padding: 12px 16px; }
.accordion summary { cursor: pointer; font-weight: 600; }
.accordion summary::after { content: "+"; float: right; }
.accordion details[open] summary::after { content: "−"; }