.site-header{
  position: sticky;
  top: 0;
  z-index: 500;
  height: 76px;
  display: flex;
  align-items: center;
  background: rgba(10,13,10,0.72);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
}
.site-header .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand{
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.brand img{ height: 34px; width: auto; }

.nav-primary{
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-primary a{
  font-size: var(--fs-body-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--dur-fast);
  position: relative;
}
.nav-primary a:hover{ color: var(--text-primary); }
.nav-primary a::after{
  content:'';
  position: absolute;
  left: 0; right: 0; bottom: -22px;
  height: 2px;
  background: var(--green-400);
  transform: scaleX(0);
  transition: transform var(--dur-fast) var(--ease-out);
}
.nav-primary a:hover::after{ transform: scaleX(1); }

.header-actions{
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav-toggle{
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:''; display:block; width: 18px; height: 2px; background: var(--text-primary);
  position: relative; transition: transform var(--dur-fast), opacity var(--dur-fast);
}
.nav-toggle span::before{ position:absolute; top:-6px; }
.nav-toggle span::after{ position:absolute; top:6px; }
.nav-toggle[aria-expanded="true"] span{ background: transparent; }
.nav-toggle[aria-expanded="true"] span::before{ transform: rotate(45deg); top:0; }
.nav-toggle[aria-expanded="true"] span::after{ transform: rotate(-45deg); top:0; }

.mobile-drawer{
  position: fixed;
  inset: 76px 0 0 0;
  z-index: 490;
  background: var(--bg-void);
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transform: translateX(100%);
  transition: transform var(--dur-med) var(--ease-in-out);
}
.mobile-drawer.is-open{ transform: translateX(0); }
.mobile-drawer a{
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
}
.mobile-drawer .header-actions{
  flex-direction: column;
  align-items: stretch;
  margin-top: var(--space-5);
}
.mobile-drawer .btn{ width: 100%; }

@media (max-width: 900px){
  .nav-primary{ display: none; }
  .header-actions .btn-secondary{ display: none; }
  .nav-toggle{ display: flex; }
}
@media (min-width: 901px){
  .mobile-drawer{ display: none; }
}