header{
  position:sticky; top:0; z-index:50;
  background:rgba(6,9,20,0.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:1180px; margin:0 auto;
  display:flex; align-items:center; gap:32px;
  padding:14px 24px;
}
.brand{display:flex; align-items:center; gap:10px; flex-shrink:0;}
.brand svg{width:30px; height:30px; display:block;}
.brand-name{font-family:'Space Grotesk'; font-weight:600; font-size:17px; letter-spacing:0.5px;}
.brand-name span{color:var(--cyan);}

nav.tabs{display:flex; gap:4px; flex:1;}
.tab{
  font-family:'Space Grotesk'; font-size:14.5px; font-weight:500;
  color:var(--text-dim);
  padding:10px 16px;
  border-bottom:2px solid transparent;
  cursor:pointer;
  background:none; border-left:none; border-right:none; border-top:none;
  transition:color .15s ease, border-color .15s ease;
}
.tab:hover{color:var(--text);}
.tab.active{color:var(--cyan); border-bottom-color:var(--cyan);}

.contact-link{
  font-family:'IBM Plex Mono'; font-size:12.5px;
  color:var(--text-dim);
  border:1px solid var(--line);
  padding:7px 12px;
  border-radius:var(--radius);
  white-space:nowrap;
}
.contact-link:hover{border-color:var(--cyan); color:var(--cyan);}

@media (max-width:860px){
  .header-inner{gap:16px; flex-wrap:wrap;}
  nav.tabs{order:3; width:100%; overflow-x:auto;}
}