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

.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--space-3);
  min-height:72px;
}

.site-header__brand{
  display:flex;
  align-items:center;
  gap:0.75rem;
  text-decoration:none;
  color:var(--color-text-primary);
}

.site-header__logo{
  height:48px;
  width:auto;
}

.site-header__brand-text{
  font-weight:600;
  font-size:1.1rem;
}

.site-header__nav{
  display:flex;
}

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

.site-header__menu li{
  margin:0;
}

.site-header__menu a{
  color:var(--color-text-primary);
  font-size:0.95rem;
  position:relative;
}

.site-header__menu a:hover{
  color:var(--color-accent-green);
}

.site-header__toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:40px;
  height:40px;
}

.site-header__toggle-line{
  height:2px;
  width:100%;
  background:var(--color-text-primary);
}

@media (max-width:900px){
  .site-header__nav{
    position:fixed;
    top:72px;
    left:0;
    right:0;
    background:var(--color-surface-bg);
    border-bottom:1px solid var(--color-border-soft);
    transform:translateY(-120%);
    transition:transform .25s ease;
  }

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

  .site-header__menu{
    flex-direction:column;
    align-items:flex-start;
    padding:var(--space-4);
    gap:var(--space-3);
  }

  .site-header__toggle{
    display:flex;
  }
}