: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{min-height:62px;display:flex;align-items:center;justify-content:center;position:relative;background:var(--brand);color:#fff}h1{margin:0;font-size:22px;letter-spacing:0}.home-link{position:absolute;left:22px;color:#fff;text-decoration:none;font-weight:700}.home-link:hover{text-decoration:underline}main{max-width:920px;margin:32px auto;padding:0 20px}.intro{margin-bottom:18px;padding:24px 26px;border:1px solid #e5e9ee;border-radius:8px;background:#fff}.intro h2{margin:0 0 10px;font-size:24px}.intro p{color:#516070}#faq-list{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:"-"}.faq-item{padding:18px 22px;border-top:1px solid #edf0f3}.faq-item h3{margin:0 0 8px;font-size:17px}.faq-item p{margin:0;color:#445162}p{margin:0}@media(max-width:600px){header{min-height:76px;flex-direction:column;gap:4px}.home-link{position:static}main{margin:18px auto;padding:0 12px}.intro{padding:20px}.intro h2{font-size:21px}}