:root{--bg:#F5F5F7;--card:#fff;--ink:#1D1D1F;--ink2:#6E6E73;--ink3:#86868B;--line:#E3E3E6;--brand:#007AFF;--brand2:#00C6FF;--deep:#0B1020}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a:hover{color:var(--brand)}
.wrap{max-width:840px;margin:0 auto;padding:0 20px}
.hd{position:sticky;top:0;z-index:9;background:rgba(245,245,247,.85);backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--line)}
.hd .wrap{max-width:1000px;display:flex;align-items:center;gap:22px;height:56px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700}
.mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:14px;display:grid;place-items:center;box-shadow:0 2px 9px rgba(0,122,255,.35)}
.hd nav{margin-left:auto;display:flex;gap:20px;align-items:center;font-size:14px;color:var(--ink2)}
.hd nav a.cta{background:var(--brand);color:#fff;padding:7px 15px;border-radius:999px;font-weight:600}
.crumbs{font-size:13px;color:var(--ink3);margin:26px 0 14px;display:flex;gap:8px;flex-wrap:wrap}
main{padding-bottom:20px}
h1{font-size:clamp(26px,4.4vw,40px);line-height:1.22;letter-spacing:-.02em;margin:0 0 16px}
.lead{font-size:17.5px;color:var(--ink2);margin:0 0 30px}
h2{font-size:20px;margin:38px 0 12px;letter-spacing:-.01em;padding-left:12px;border-left:4px solid transparent;border-image:linear-gradient(135deg,var(--brand),var(--brand2)) 1}
h3{font-size:16.5px;margin:22px 0 6px}
p,li{color:var(--ink2)}
ul{padding-left:22px;margin:8px 0}
li{margin:5px 0}
.card{background:var(--card);border-radius:18px;padding:24px 26px;box-shadow:0 1px 2px rgba(0,0,0,.04),0 10px 30px rgba(0,0,0,.05);margin:22px 0}
.faq details{background:var(--card);border-radius:14px;padding:14px 18px;margin:10px 0;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.faq summary{cursor:pointer;font-weight:600;color:var(--ink);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q ";color:var(--brand);font-weight:700}
.faq p{margin:10px 0 0;padding-top:10px;border-top:1px solid var(--line)}
.rel ul{list-style:none;padding:0;display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.rel li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:0;font-size:15px}
.rel li a{color:var(--brand);font-weight:600}
.cta-box{background:linear-gradient(135deg,var(--deep),#12203f);color:#fff;border-radius:18px;padding:28px 26px;margin:30px 0;display:flex;gap:18px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.cta-box p{margin:0;color:#9AA3B5;max-width:520px}
.btn{display:inline-block;padding:12px 26px;border-radius:999px;font-weight:600;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;white-space:nowrap}
.btn.ghost{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22)}
.ft{border-top:1px solid var(--line);margin-top:44px;padding:30px 0 44px;font-size:13px;color:var(--ink3);text-align:center}
.ft-links{display:flex;gap:18px;flex-wrap:wrap;justify-content:center;margin-bottom:12px}
.ft-beian{display:flex;gap:18px;flex-wrap:wrap;justify-content:center;align-items:center;margin-bottom:8px}
.ft-beian a{display:inline-flex;align-items:center;gap:5px;color:var(--ink3)}
.ft-beian img{width:14px;height:14px}
@media(max-width:640px){.hd nav a:not(.cta){display:none}.card{padding:18px}}