.site-header{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--color-border);background-color:var(--color-bg)}.nav__brand{display:inline-flex;flex-direction:column;gap:2px}.nav__brand-sub{font-size:var(--font-size-xs);letter-spacing:0.16em;text-transform:uppercase;color:var(--color-muted);font-family:var(--font-mono)}.nav__menu-wrapper{display:flex;align-items:center}.nav__item--highlight .nav__link{border-color:var(--color-accent);color:var(--color-accent)}.nav__item--highlight .nav__link:focus-visible{border-color:var(--color-text)}.nav__link{position:relative}.nav__link::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;background-color:var(--color-text);transition:width var(--transition-fast)}.nav__link:hover::after{width:100%}@media (max-width:768px){.site-header{position:relative}.nav__menu-wrapper{flex:1;justify-content:flex-end}.nav__menu{width:100%}.nav__item{border-bottom:1px solid var(--color-border);padding-block:4px}.nav__item:last-child{border-bottom:none}.nav__link{display:block;padding-block:6px}}