<div style="min-height:100vh; display:flex; align-items:center; justify-content:center; padding:28px;">
    <div style="width:720px; max-width:92vw;">
        <details>
            <summary>
                =
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            <div style="background:#ffffff; color:#111; border-radius:22px; padding:18px 22px; box-shadow:0 10px 30px rgba(0,0,0,0.25);">
                <div style="text-align: center; font-weight: 900; letter-spacing: -0.2px; cursor: pointer; user-select: none; font-size: 14px;" title="펼치기/접기">
                    <span id="detailsCaret" style="margin-left:4px; color:#111;">
                        ▲
                    </span>
                </div>
                <div style="height:16px;">
                    <br>
                </div>
                <div id="detailsBody" style="display: block;">
                    <div style="border:1px solid #e6e9ee; border-radius:14px; overflow:hidden; background:#ffffff;">
                        <br>
                    </div>
                    <br>
                </div>
            </div>
        </details>
    </div>
</div>