.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-container {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}
.logo img {
  height: 36px;
  width: auto;
  filter: brightness(0) saturate(100%) invert(32%) sepia(74%) saturate(600%) hue-rotate(195deg) brightness(95%) contrast(95%);
}
.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.main-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.main-nav ul li a {
  font-size: var(--font-size-sm);
  font-weight: 400;
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition);
}
.main-nav ul li a:hover { color: var(--color-primary); }
.nav-cta {
  font-size: var(--font-size-sm) !important;
  padding: 8px 18px !important;
  white-space: nowrap;
}

/* Auth-aware */
body.logged-out .auth-link.logged-in { display: none; }
body.logged-in .auth-link.logged-out { display: none; }

/* Mobile toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}
.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-5) var(--space-4);
  border-top: 1px solid var(--color-border);
  animation: slideDown 0.25s ease;
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.mobile-menu.open { display: block; }
.mobile-menu nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.mobile-menu nav ul li a {
  display: block;
  padding: 12px 0;
  font-size: var(--font-size-md);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
}
.mobile-menu nav ul li:last-child a { border-bottom: none; }
.mobile-menu .btn-primary {
  display: block;
  margin-top: var(--space-4);
  text-align: center;
  padding: 14px;
  font-size: var(--font-size-base);
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .mobile-menu-toggle { display: flex; }
}