*,*::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:#000;color:#eaeaea;line-height:1.65}
img{max-width:100%;height:auto;display:block}
a{color:#fff;text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{width:min(1140px,92vw);margin:0 auto}

.site-header{position:sticky;top:0;z-index:100;background:#000;border-bottom:1px solid #222}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.55rem 0;gap:1rem}
.logo{font-weight:800;font-size:.88rem;color:#fff;letter-spacing:.04em;display:flex;align-items:center;gap:.45rem}
.logo-node{width:8px;height:8px;background:#fff;border-radius:50%}
.nav-main{display:flex;flex-wrap:wrap;gap:.25rem .95rem;font-size:.78rem}
.nav-main a{color:#888;font-weight:600}
.nav-main a.active,.nav-main a:hover{color:#fff;text-decoration:none}
.btn-nav{display:inline-block;background:#fff;color:#000!important;padding:.34rem .9rem;font-weight:800;font-size:.74rem;text-decoration:none!important;border-radius:999px}
.btn-nav:hover{background:#ddd}

.edge-bar{border-bottom:1px solid #222;font-size:.68rem;padding:.28rem 0;color:#666;letter-spacing:.08em}
.edge-bar .container{display:flex;flex-wrap:wrap;gap:.35rem 1.3rem}
.edge-bar em{color:#fff;font-style:normal;font-weight:700}

.section{padding:2.8rem 0}
.section-title{font-size:clamp(1.08rem,3vw,1.4rem);font-weight:800;margin-bottom:.3rem;color:#fff}
.section-lead{color:#888;font-size:.85rem;margin-bottom:1.4rem;max-width:640px}

.footer{border-top:1px solid #222;padding:2rem 0 0;font-size:.8rem;color:#888}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:1.4rem;margin-bottom:1.2rem}
.footer h3{font-size:.82rem;color:#fff;margin-bottom:.45rem;font-weight:800}
.footer a{color:#888}
.footer-links{display:flex;flex-wrap:wrap;gap:.28rem .75rem}
.footer-bottom{border-top:1px solid #222;padding-top:.75rem;text-align:center;color:#555;font-size:.7rem}

.faq-list{display:flex;flex-direction:column;gap:.4rem}
.faq-item{background:#0a0a0a;border:1px solid #222}
.faq-q{width:100%;text-align:left;padding:.82rem .95rem;font-weight:800;font-size:.84rem;background:transparent;border:none;cursor:pointer;color:#fff;display:flex;justify-content:space-between;align-items:center;font-family:inherit}
.faq-q::after{content:"+";font-size:1.05rem;color:#888}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 .95rem .82rem;font-size:.8rem;color:#888}
.faq-item.open .faq-a{display:block}

.btn-v{display:inline-block;background:#fff;color:#000;padding:.5rem 1.1rem;font-weight:800;font-size:.82rem;text-decoration:none!important;border-radius:999px}
.btn-v:hover{background:#ddd}
.btn-ghost{display:inline-block;color:#fff;border:1px solid #444;padding:.48rem 1.05rem;font-weight:700;font-size:.82rem;text-decoration:none!important;background:transparent;border-radius:999px}

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