*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#fff;color:#0a2540;line-height:1.7}
img{max-width:100%;height:auto;display:block}
a{color:#635bff;text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{width:min(1080px,90vw);margin:0 auto}

.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid #e6ebf1}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.85rem 0;gap:1rem}
.logo{font-weight:800;font-size:.92rem;color:#0a2540;letter-spacing:-.02em;display:flex;align-items:center;gap:.45rem}
.logo-mark{width:18px;height:18px;background:#635bff;border-radius:4px}
.nav-main{display:flex;flex-wrap:wrap;gap:.3rem 1.15rem;font-size:.82rem}
.nav-main a{color:#425466;font-weight:600}
.nav-main a.active,.nav-main a:hover{color:#0a2540;text-decoration:none}
.btn-nav{display:inline-block;background:#635bff;color:#fff!important;padding:.42rem 1rem;font-weight:700;font-size:.78rem;text-decoration:none!important;border-radius:20px}
.btn-nav:hover{background:#7a73ff}

.cert-bar{border-bottom:1px solid #e6ebf1;font-size:.72rem;padding:.4rem 0;color:#425466}
.cert-bar .container{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem}
.cert-bar em{color:#635bff;font-style:normal;font-weight:700}

.section{padding:4rem 0}
.section-title{font-size:clamp(1.2rem,3vw,1.55rem);font-weight:800;margin-bottom:.4rem;color:#0a2540;letter-spacing:-.03em}
.section-lead{color:#425466;font-size:.9rem;margin-bottom:2rem;max-width:560px}

.card{background:#fff;border:1px solid #e6ebf1;border-radius:12px}

.footer{border-top:1px solid #e6ebf1;padding:2.6rem 0 0;font-size:.82rem;color:#425466}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2rem;margin-bottom:1.6rem}
.footer h3{font-size:.84rem;color:#0a2540;margin-bottom:.55rem;font-weight:800}
.footer a{color:#425466}
.footer-links{display:flex;flex-wrap:wrap;gap:.35rem .9rem}
.footer-bottom{border-top:1px solid #e6ebf1;padding-top:1rem;text-align:center;color:#8898aa;font-size:.72rem}

.faq-list{display:flex;flex-direction:column;gap:.55rem}
.faq-item{background:#fff;border:1px solid #e6ebf1;border-radius:10px}
.faq-q{width:100%;text-align:left;padding:1rem 1.15rem;font-weight:700;font-size:.88rem;background:transparent;border:none;cursor:pointer;color:#0a2540;display:flex;justify-content:space-between;align-items:center;font-family:inherit}
.faq-q::after{content:"+";font-size:1.1rem;color:#635bff}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 1.15rem 1rem;font-size:.84rem;color:#425466}
.faq-item.open .faq-a{display:block}

.btn-st{display:inline-block;background:#635bff;color:#fff;padding:.58rem 1.25rem;font-weight:700;font-size:.86rem;text-decoration:none!important;border-radius:22px}
.btn-st:hover{background:#7a73ff}
.btn-ghost{display:inline-block;color:#0a2540;border:1px solid #e6ebf1;padding:.56rem 1.2rem;font-weight:700;font-size:.86rem;text-decoration:none!important;background:#fff;border-radius:22px}

@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .footer-grid{grid-template-columns:1fr}
}