.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-mint-bg);
  border-bottom: 1px solid var(--color-mint-border);
  transition: box-shadow 0.35s ease;
}
.site-header.is-scrolled {
  box-shadow: 0 8px 30px rgba(1, 168, 186, 0.12);
}

.site-header .navbar { padding: 0.85rem 0; }

.navbar-brand { display: flex; align-items: center; gap: 0.6rem; }
.brand-logo-icon { height: 38px; width: auto; }
.brand-wordmark {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--color-navy);
}
.brand-wordmark span {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-teal-dark);
}

.site-header .nav-link {
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 0.5rem 0.9rem;
  transition: var(--transition-smooth);
}
.site-header .nav-link:hover,
.site-header .nav-link.active {
  color: var(--color-teal-dark);
}

.site-header .btn-brand-primary { padding: 0.6rem 1.4rem; font-size: 0.9rem; }

.site-header .navbar-toggler {
  border: none;
  padding: 0.25rem;
  color: var(--color-navy);
  box-shadow: none !important;
}
.site-header .navbar-toggler .icon { width: 26px; height: 26px; }

.site-header .nav-link.dropdown-toggle::after {
  margin-left: 0.35rem;
  vertical-align: 0.1em;
  border-top-color: currentColor;
  opacity: 0.6;
}

/* Brand dropdown / mega-menu */
.site-header .brand-dropdown {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 1rem;
  margin-top: 0.5rem;
  background: #fff;
}
.brand-dropdown-mega { min-width: 620px; }
.brand-dropdown-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem 1.5rem;
}
.brand-dropdown-head {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-teal-dark);
  padding: 0.4rem 0.6rem 0.2rem;
}
.site-header .brand-dropdown .dropdown-item {
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.6rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-navy);
  white-space: normal;
}
.site-header .brand-dropdown .dropdown-item:hover,
.site-header .brand-dropdown .dropdown-item:focus {
  background: var(--color-mint-bg);
  color: var(--color-teal-dark);
}
.brand-dropdown-all {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0.6rem 0.6rem 0;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-teal-dark);
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
  width: calc(100% - 1.2rem);
}
.brand-dropdown-all .icon { transition: var(--transition-smooth); }
.brand-dropdown-all:hover .icon { transform: translateX(3px); }

@media (min-width: 992px) {
  /* Reveal the mega-menu on hover as well as click, for a smoother desktop feel */
  .site-header .nav-item.dropdown:hover > .dropdown-menu { display: block; }
}

@media (max-width: 991px) {
  .site-header .navbar-collapse {
    padding: 1rem 1.25rem;
    margin-top: 0.85rem;
    background-color: #fff;
    border: 1px solid var(--color-mint-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 78vh;
    overflow-y: auto;
  }
  .site-header .nav-item { margin-bottom: 0.25rem; }
  .site-header .btn-brand-primary { display: inline-block; margin-top: 0.5rem; }
  .site-header .brand-dropdown {
    border: none;
    box-shadow: none;
    padding: 0.25rem 0 0.5rem 0.75rem;
    margin-top: 0;
  }
  .brand-dropdown-mega { min-width: 0; }
  .brand-dropdown-grid { grid-template-columns: 1fr; gap: 0.1rem; }
  .brand-dropdown-head { padding-top: 0.6rem; }
}