.site-header{position:sticky;top:0;z-index:1000;background:transparent;transition:background var(--transition-fast);} 
.site-header.scrolled{background:var(--color-surface-primary);} 
.site-header__inner{display:flex;align-items:center;justify-content:space-between;min-height:80px;} 
.site-header__brand{display:flex;align-items:center;gap:var(--space-2);} 
.site-header__logo{height:44px;width:auto;} 
.site-header__brand-text{font-family:var(--font-heading);font-size:1.4rem;} 

.nav-toggle{display:none;flex-direction:column;gap:4px;padding:8px;} 
.nav-toggle span{width:24px;height:2px;background:var(--color-text-primary);} 

.site-nav{display:flex;} 
.site-nav__list{display:flex;gap:var(--space-4);margin:0;padding:0;} 
.site-nav__list li{margin:0;padding:0;} 
.site-nav a{font-size:0.95rem;} 

@media(max-width:900px){
  .nav-toggle{display:flex;} 
  .site-nav{position:fixed;top:0;right:0;height:100vh;width:80%;max-width:320px;background:var(--color-surface-secondary);transform:translateX(100%);transition:transform var(--transition-fast);padding:var(--space-5);}
  .site-nav.open{transform:translateX(0);} 
  .site-nav__list{flex-direction:column;gap:var(--space-3);} 
}