.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(247, 247, 247, 0.9);
  backdrop-filter: blur(2px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.site-nav {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-brand {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.site-brand img {
  display: block;
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav-links {
  margin: 0;
  padding: 0;
  list-style: none;
  gap: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-link {
  color: #222222;
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 10px;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.nav-link:hover {
  background-color: #f2f2f2;
  color: var(--color-text);
}

.nav-link.active,
.nav-link.active:hover {
  background-color: rgba(0, 0, 0, 1);
  color: #ffffff;
}

.menu-toggle {
  display: none;
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  border: 0;
  background: transparent;
  color: #222222;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

@media (max-width: 900px) {
  .site-nav {
    justify-content: center;
  }

  .nav-enhanced .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
  }

  .menu-toggle i {
    transition:
      transform var(--transition-fast),
      opacity var(--transition-fast);
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;

    margin: 0;
    padding: 0;

    display: flex;
    flex-direction: column;
    gap: 0;

    align-items: stretch;
    justify-content: flex-start;

    background-color: rgba(247, 247, 247, 0.98);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);

    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      transform var(--transition-fast),
      opacity var(--transition-fast);
  }

  .site-nav.menu-open .menu-toggle i {
    transform: rotate(90deg);
  }

  .site-nav.menu-open .nav-links {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid #e6e6e6;
  }

  .nav-links li:last-child {
    border-bottom: 0;
  }

  .nav-link {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-radius: 0;
  }

  .nav-link:hover {
    background-color: #e6e6e6;
  }

  .nav-link.active,
  .nav-link.active:hover {
    background-color: #111111;
    color: #ffffff;
  }
}

@media (max-width: 768px) {
  .site-nav {
    padding: 0 1rem;
  }

  .site-brand {
    left: 1rem;
  }

  .menu-toggle {
    right: 1rem;
  }
}

@media (max-width: 900px) {
  .site-header:has(.site-nav:not(.nav-enhanced)) {
    position: static;
    height: auto;
  }

  .site-nav:not(.nav-enhanced) {
    padding-top: var(--header-height);
  }

  .site-nav:not(.nav-enhanced) .site-brand {
    top: 25px;
  }

  .site-nav:not(.nav-enhanced) .nav-links {
    position: static;
    width: 100%;
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }
}