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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-mark {
  height: 36px;
  width: auto;
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-list {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
}

.nav-list a {
  font-size: var(--fs-6);
  text-transform: uppercase;
  position: relative;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after {
  width: 100%;
}

.nav-cta {
  margin-left: var(--space-2);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  position: relative;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-lines::before { top: -6px; }
.nav-toggle-lines::after { top: 6px; }

@media (max-width: 900px) {
  .nav-toggle { display: flex; z-index: 1000;}

  .site-nav {
    position: fixed;
    inset: 0;
    background: var(--color-surface-black);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-3);
    transform: translateY(-100%);
    transition: transform var(--transition-fast);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: center;
  }
}

body.nav-open {
  overflow: hidden;
}