// Component: Header
.site-header {
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-color);
  border-bottom: 2px solid var(--text-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

// Right side wrapper (links + controls)
.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

// Always-visible icon controls
.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-smooth);
  &:hover {
    color: var(--accent-color);
  }
}

// Hamburger button — hidden on desktop, shown on mobile
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 0.25rem;
  align-items: center;
  justify-content: center;

  .close-icon {
    display: none;
  }

  &[aria-expanded='true'] {
    .hamburger-icon {
      display: none;
    }
    .close-icon {
      display: block;
    }
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  // Hide the site name when the menu is open
  .nav-container:has(#nav-toggle[aria-expanded='true']) .brand-link {
    display: none;
  }

  // Make nav-right fill the full width so menu items span the container
  .nav-container:has(#nav-toggle[aria-expanded='true']) .nav-right {
    width: 100%;
  }

  .nav-right {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .nav-links {
    display: flex !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0 !important;
    width: 100%;
    order: 10; // push below nav-controls
    padding: 0;
    margin-top: 0;
    border-top: 1px solid transparent;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition:
      max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1),
      opacity 0.2s ease;

    &.is-open {
      padding: 1rem 0;
      margin-top: 0.5rem;
      border-top-color: var(--border-color);
      max-height: 320px;
      opacity: 1;
    }

    .nav-item {
      width: 100%;
      padding: 0.75rem 0;
      font-size: 1rem;
      border-bottom: 1px solid var(--border-color);
      &::after {
        display: none;
      }
    }
  }
}

// Brand reads like a running header on a printed document — quiet,
// small, letter-spaced — not competing with the masthead title below it.
.brand-text {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.brand-link:hover .brand-text {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-item {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-color);
  position: relative;
}

.nav-item::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--accent-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-item:hover::after {
  transform: scaleX(1);
}

.nav-item.is-active {
  color: var(--accent-color);

  &::after {
    transform: scaleX(1);
  }
}