/* 统一站点导航 —— 单一数据源，全站注入 #siteNav */
.site-nav{
  position:sticky; top:0; left:0; right:0; z-index:1000;
  background:rgba(15,23,42,.96);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(139,92,246,.25);
}
.site-nav .sn-inner{
  max-width:1200px; margin:0 auto; padding:0 24px; height:64px;
  display:flex; align-items:center; gap:20px;
}
.site-nav .sn-brand{
  display:flex; align-items:center; gap:10px;
  font-size:1.1rem; font-weight:800; color:#e2e8f0;
  text-decoration:none; white-space:nowrap;
}
.site-nav .sn-brand .logo-icon{
  width:34px; height:34px; border-radius:10px;
  background:linear-gradient(135deg,#8b5cf6,#6366f1);
  display:flex; align-items:center; justify-content:center; font-size:1.1rem;
}
.site-nav .sn-links{
  display:flex; gap:18px; list-style:none; margin:0; padding:0; flex:1;
}
.site-nav .sn-links a{
  color:#94a3b8; font-size:.9rem; font-weight:500;
  text-decoration:none; transition:color .2s; white-space:nowrap;
}
.site-nav .sn-links a:hover{ color:#e2e8f0; }
.site-nav .sn-links a.active{ color:#a78bfa; font-weight:700; }
.site-nav .sn-actions{ display:flex; align-items:center; gap:12px; }
.site-nav .sn-cta{
  padding:9px 20px; border-radius:8px; font-size:.85rem; font-weight:600;
  background:linear-gradient(135deg,#8b5cf6,#6366f1); color:#fff;
  text-decoration:none; white-space:nowrap;
}
.site-nav .sn-extras{ display:flex; align-items:center; gap:8px; }
.site-nav .sn-toggle{
  display:none; background:none; border:none; color:#e2e8f0;
  font-size:1.4rem; cursor:pointer;
}
@media(max-width:860px){
  .site-nav .sn-toggle{ display:block; }
  .site-nav .sn-links{
    position:absolute; top:64px; left:0; right:0;
    background:rgba(15,23,42,.98); flex-direction:column;
    padding:16px 24px; gap:14px; display:none;
  }
  .site-nav .sn-links.open{ display:flex; }
  .site-nav .sn-cta{ display:none; }
}