.site-header{
  position:sticky;top:0;z-index:200;
  background:var(--surface-glass);
  backdrop-filter:blur(20px) saturate(1.2);
  -webkit-backdrop-filter:blur(20px) saturate(1.2);
  border-bottom:1px solid transparent;
  transition:background .25s,border-color .25s,box-shadow .25s;
}
.site-header.is-scrolled{
  background:rgba(255,255,255,.94);
  border-bottom-color:var(--border);
  box-shadow:var(--shadow-sm);
}
.site-header .header-inner{
  display:flex;align-items:center;justify-content:space-between;
  max-width:1160px;margin:0 auto;
  padding:0 clamp(20px,4vw,32px);
  height:var(--header-h);gap:20px;
}
.site-header .logo{display:flex;align-items:center;gap:13px;text-decoration:none;flex-shrink:0}
.site-header .logo-mark svg{width:44px;height:44px;display:block}
.site-header .logo-wordmark{font-weight:800;font-size:1.5rem;letter-spacing:-.03em;color:var(--ink);line-height:1.1}
.site-header .logo-wordmark span{color:var(--blue)}
.site-header .logo-sub{font-size:.65rem;color:var(--text-muted);font-weight:500;letter-spacing:.1em;text-transform:uppercase;margin-top:1px}
.site-header .main-nav{display:flex;align-items:center;gap:4px}
.site-header .nav-link{
  padding:8px 14px;border-radius:10px;font-size:.9rem;font-weight:600;
  color:var(--text-mid);text-decoration:none;
  transition:background .18s,color .18s;
}
.site-header .nav-link:hover,.site-header .nav-link.active{background:var(--blue-tint);color:var(--blue)}
.site-header .nav-dropdown{position:relative}
.site-header .nav-btn{
  display:flex;align-items:center;gap:5px;padding:8px 14px;border-radius:10px;
  font-size:.9rem;font-weight:600;color:var(--text-mid);
  background:none;border:none;cursor:pointer;
  transition:background .18s,color .18s;font-family:inherit;
}
.site-header .nav-btn:hover,.site-header .nav-btn.active{background:var(--blue-tint);color:var(--blue)}
.site-header .dropdown-menu{
  display:none;position:absolute;top:calc(100% + 10px);left:0;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-sm);box-shadow:var(--shadow-md);
  min-width:260px;overflow:hidden;z-index:300;
  padding:6px;
}
.site-header .dropdown-menu.open{display:block}
.site-header .dropdown-item{
  display:block;padding:10px 14px;font-size:.88rem;font-weight:600;
  color:var(--text-mid);text-decoration:none;border-radius:8px;
  transition:background .15s,color .15s;
}
.site-header .dropdown-item:hover,.site-header .dropdown-item.active{background:var(--blue-tint);color:var(--blue)}
.site-header .btn-header-phone{
  display:flex;align-items:center;gap:8px;padding:10px 20px;
  background:linear-gradient(135deg,var(--blue),var(--blue-mid));
  color:#fff;border-radius:100px;font-size:.88rem;font-weight:700;
  text-decoration:none;box-shadow:0 4px 16px rgba(15,111,232,.28);
  transition:transform .2s,box-shadow .2s;white-space:nowrap;
}
.site-header .btn-header-phone:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(15,111,232,.38)}
.site-header .btn-header-phone svg,.site-header .nav-btn svg{width:15px;height:15px;fill:currentColor}
.site-header .hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.site-header .hamburger span{display:block;width:24px;height:2.5px;background:var(--ink);border-radius:2px;transition:all .25s}
.site-header .hamburger.is-open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.site-header .hamburger.is-open span:nth-child(2){opacity:0}
.site-header .hamburger.is-open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
.site-header .mobile-menu{background:var(--surface);border-top:1px solid var(--border);padding:20px clamp(20px,4vw,32px) 28px}
.site-header .mobile-menu[hidden]{display:none}
.site-header .mobile-section-title{font-size:.68rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted);padding:8px 0 6px}
.site-header .mobile-link{display:block;padding:11px 0;font-size:.97rem;font-weight:600;color:var(--text-mid);text-decoration:none;border-bottom:1px solid var(--border)}
.site-header .mobile-link:last-of-type{border-bottom:none}
.site-header .mobile-link.active{color:var(--blue)}
.site-header .mobile-contact{margin-top:20px;display:flex;flex-direction:column;gap:10px}
.site-header .mobile-contact a{color:var(--blue);font-weight:700;text-decoration:none;font-size:.95rem}
@media(max-width:860px){.site-header .main-nav,.site-header .btn-header-phone{display:none}.site-header .hamburger{display:flex}}