.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 2rem;
  background: rgba(11, 15, 25, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--brand-border);
}

.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}
.site-logo img {
  display: block;
  height: 200px;
  width: auto;
}

.site-header .nav {
  position: static;
  max-width: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  flex: 1;
}

.site-header .nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: 1.75rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(20, 184, 166, 0.12);
  border: 1px solid var(--brand-border);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-heading);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 641px) {
  .site-header .nav-links { display: flex; }
}

@media (max-width: 640px) {
  .site-header {
    flex-wrap: wrap;
    justify-content: center;
    padding: 0.75rem 1.25rem;
  }
  .site-logo { margin: 0 auto; }
  .site-logo img { height: 200px; }
  .nav-toggle {
    display: flex;
    position: absolute;
    top: 0.75rem;
    right: 1.25rem;
    z-index: 110;
  }
  .site-header .nav {
    position: static;
    flex: 1 1 100%;
    justify-content: center;
  }
  .site-header .nav-links {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.98);
    border: 1px solid var(--brand-border);
    border-radius: 14px;
    padding: 0.5rem 1rem;
    margin-top: 0.5rem;
  }
  .site-header .nav-links li { width: 100%; }
  .site-header .nav-links a {
    display: block;
    padding: 0.8rem 0.75rem;
  }
  .site-header .nav-links.open { display: flex; }
}