/* ═══════════════════════════════════════════════════════════
   HEADER & NAVIGATION COMPONENT
   Navegação desktop, toggle de idioma e menu mobile
   ═══════════════════════════════════════════════════════════ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--dur-base) var(--ease-smooth),
              border-color var(--dur-base) var(--ease-smooth);
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(242, 247, 255, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-color: var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-img {
  height: 28px;
  width: auto;
  display: block;
}

/* Grupo direito do nav: lang-toggle + cta + burger */
.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* Toggle de idioma */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
}

.lang-btn {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-content-60);
  padding: 4px 6px;
  transition: color var(--dur-fast) var(--ease-smooth);
  background: none;
  border: none;
}

.lang-btn--active {
  color: var(--color-primary);
}

.lang-btn:hover {
  color: var(--color-content);
}

.lang-divider {
  color: var(--color-content-30);
  font-size: var(--fs-xs);
  user-select: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-left: auto;
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-content-60);
  transition: color var(--dur-fast) var(--ease-smooth);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width var(--dur-base) var(--ease-smooth);
}

.nav__link:hover {
  color: var(--color-content);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__cta {
  margin-left: var(--space-2);
  padding: 10px 20px;
  font-size: var(--fs-xs);
}

/* Burger — visível apenas em mobile */
.nav__burger {
  display: none; /* oculto por padrão em desktop */
  flex-direction: column;
  gap: 6px;
  padding: 4px;
}

.nav__burger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-content);
  transition: transform var(--dur-base) var(--ease-smooth),
              opacity var(--dur-fast);
  transform-origin: center;
}

.nav__burger.active span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}
.nav__burger.active span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile Nav — fundo sólido para legibilidade */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  height: 100svh;
  top: var(--nav-height);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  z-index: 999;
  padding: var(--space-8) var(--container-pad);
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-smooth);
}

.nav__mobile.open {
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-link {
  display: block;
  font-size: var(--fs-2xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-content-30);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--dur-fast) var(--ease-smooth);
}

.nav__mobile-link:hover {
  color: var(--color-content);
}

.nav__mobile-link--cta {
  color: var(--color-primary);
  border-bottom: none;
  margin-top: var(--space-3);
}

/* Toggle de idioma dentro do menu mobile */
.nav__mobile-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.nav__mobile-lang .lang-btn {
  font-size: var(--fs-sm);
  padding: 6px 10px;
}

.nav__mobile-lang .lang-divider {
  font-size: var(--fs-sm);
}