.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding-block: var(--space-3);
  background: linear-gradient(to bottom, rgba(5, 5, 5, 0.7), transparent);
  transition: background-color var(--dur-base) var(--ease-out),
              padding-block var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(10px);
  padding-block: var(--space-2);
  border-bottom: 1px solid var(--black-700);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: block;
  height: 40px;
}

.brand img {
  height: 100%;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.main-nav__links {
  display: flex;
  gap: var(--space-4);
  font-size: var(--fs-sm);
  font-weight: 600;
}

.main-nav__links a {
  position: relative;
  padding-block: var(--space-1);
  color: var(--text-primary);
  transition: color var(--dur-fast) var(--ease-out);
}

.main-nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--gold-500);
  transition: width var(--dur-fast) var(--ease-out);
}

.main-nav__links a:hover,
.main-nav__links a:focus-visible {
  color: var(--gold-400);
}

.main-nav__links a:hover::after,
.main-nav__links a:focus-visible::after {
  width: 100%;
}

.main-nav__social {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-left: var(--space-3);
  border-left: 1px solid var(--black-600);
}

.main-nav__social a {
  color: var(--text-muted);
  transition: color var(--dur-fast) var(--ease-out);
}

.main-nav__social a:hover,
.main-nav__social a:focus-visible {
  color: var(--gold-400);
}

.main-nav__social .icon {
  width: 1.1rem;
  height: 1.1rem;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  z-index: calc(var(--z-header) + 1);
}

.menu-toggle .icon {
  width: 1.5rem;
  height: 1.5rem;
}

.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

@media (max-width: 860px) {
  .main-nav__links {
    position: fixed;
    inset: 0;
    z-index: var(--z-header);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-5);
    font-size: var(--fs-xl);
    background: var(--black-950);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out),
                visibility var(--dur-base) var(--ease-out);
  }

  .main-nav__links.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .menu-toggle {
    display: block;
  }
}

@media (max-width: 640px) {
  .main-nav__social {
    display: none;
  }

  .site-header .container {
    gap: var(--space-2);
  }

  .subscribe .btn {
    padding: 0.75rem 1.25rem;
    font-size: var(--fs-xs);
  }
}

/* destaque pulsante no link "Apoio" — halo dourado que respira + pontinho tipo
   notificação, pra chamar atenção sem gritar nem atrapalhar o clique */
.nav-pulse {
  position: relative;
  isolation: isolate;
}

.nav-pulse::before {
  content: '';
  position: absolute;
  inset: -10px -14px;
  z-index: -1;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(232, 185, 35, 0.35) 0%, rgba(232, 185, 35, 0) 70%);
  animation: navGlowPulse 2.6s ease-in-out infinite;
}

.nav-pulse__dot {
  position: absolute;
  top: -3px;
  right: -10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-500);
  animation: navDotPing 2.6s ease-out infinite;
}

@keyframes navGlowPulse {
  0%, 100% {
    opacity: 0.45;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

@keyframes navDotPing {
  0% {
    box-shadow: 0 0 0 0 rgba(232, 185, 35, 0.55);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(232, 185, 35, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(232, 185, 35, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-pulse::before,
  .nav-pulse__dot {
    animation: none;
    opacity: 0.7;
  }
}