:root{--brand:#289cf5;--soft:#eef8ff}*{box-sizing:border-box}body{margin:0;background:#f7f9fb;color:#182230;font:15px/1.7 system-ui,-apple-system,"Microsoft YaHei",sans-serif}header{height:62px;display:flex;align-items:center;justify-content:center;background:var(--brand);color:#fff}h1{margin:0;font-size:22px;letter-spacing:0}main{max-width:920px;margin:32px auto;padding:0 20px}#faq-list,#faq-detail{overflow:hidden;border:1px solid #e5e9ee;border-radius:8px;background:#fff}details+details{border-top:1px solid #e8ebef}summary{padding:18px 22px;font-weight:700;cursor:pointer;list-style:none}summary::-webkit-details-marker{display:none}summary:after{content:"+";float:right;color:var(--brand);font-size:22px}details[open] summary{background:var(--soft)}details[open] summary:after{content:"-"}details button{display:block;width:100%;padding:15px 22px;border:0;border-top:1px solid #edf0f3;background:#fff;color:inherit;text-align:left;font:inherit;cursor:pointer}details button:hover{background:#f9fcff;color:var(--brand)}#faq-detail{padding:28px}#back{border:0;background:none;color:var(--brand);font:600 15px/1.4 inherit;cursor:pointer;padding:0 0 16px}h2{margin:4px 0 16px;font-size:24px}p{margin:0}@media(max-width:600px){header{height:54px}main{margin:18px auto;padding:0 12px}#faq-detail{padding:20px}}