.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:#fff;
  border-bottom:1px solid var(--color-border-light);
}

.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:80px;
}

.site-header__brand{
  display:flex;
  align-items:center;
  gap:0.75rem;
  flex-shrink:0;
}

.site-header__logo{
  height:44px;
  width:auto;
}

.site-header__brand-text{
  font-weight:500;
  font-size:1rem;
}

.site-header__nav{
  display:flex;
}

.site-header__menu{
  list-style:none;
  display:flex;
  align-items:center;
  gap:1.5rem;
  margin:0;
  padding:0;
}

.site-header__menu li{margin:0;padding:0;}

.site-header__menu a{
  font-size:0.95rem;
  white-space:nowrap;
}

.site-header__toggle{
  display:none;
  width:44px;
  height:44px;
  border-radius:12px;
  border:1px solid var(--color-border-light);
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:4px;
}

.site-header__toggle span{
  width:18px;
  height:2px;
  background:var(--color-text-primary);
}

@media(max-width:900px){
  .site-header__nav{
    position:fixed;
    top:80px;
    right:0;
    width:100%;
    max-width:320px;
    height:calc(100vh - 80px);
    background:#fff;
    border-left:1px solid var(--color-border-light);
    transform:translateX(100%);
    transition:transform var(--transition-fast);
    padding:1.5rem;
    overflow-y:auto;
  }

  .site-header__nav.is-open{
    transform:translateX(0);
  }

  .site-header__menu{
    flex-direction:column;
    align-items:flex-start;
    gap:1rem;
  }

  .site-header__toggle{
    display:flex;
  }
}