details.accordion{border:1px solid #ccc;border-radius:4px;margin-bottom:10px}details.accordion summary{cursor:pointer;list-style:none;padding:12px 15px 12px 40px;font-weight:700;background-color:#f7f7f7;position:relative;outline:none}details.accordion[open] summary{background-color:#e9e9e9;border-bottom:1px solid #ccc}details.accordion summary::before{content:"▶️";position:absolute;left:15px;top:50%;transform:translateY(-50%);transition:transform .2s ease-in-out}details.accordion[open] summary::before{content:"▼";transform:translateY(-50%) rotate(0deg)}details.accordion>div{padding:15px;line-height:1.6}