/* ==========================================================================
   Navbar — fixa no topo, ganha fundo sólido ao rolar (.is-scrolled via JS).
   ========================================================================== */

.navbar {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: var(--z-navbar);
  transition: box-shadow var(--transition-base),
    padding var(--transition-base);
  padding-block: var(--space-4);
}

/* O fundo translúcido mora aqui, e não na .navbar, de propósito.
   Um elemento com backdrop-filter vira bloco contentor dos descendentes
   position: fixed — e o painel do menu mobile é um deles. Aplicado na
   .navbar, o filtro prendia o painel à altura da barra em vez da janela.
   No pseudo-elemento o efeito é o mesmo e o painel volta a se medir pela
   viewport. */
.navbar::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: transparent;
  transition: background-color var(--transition-base),
    backdrop-filter var(--transition-base);
  pointer-events: none;
}

.navbar.is-scrolled::before {
  background-color: var(--surface-glass);
  backdrop-filter: blur(10px);
}

.navbar.is-scrolled {
  box-shadow: var(--shadow-sm);
  padding-block: var(--space-3);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar__monogram {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  font-family: var(--font-display);
  /* A serifa tem maiúsculas mais baixas: no corpo anterior o monograma
     ficaria com 8.8px de altura dentro de um círculo de 40px. */
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--serenity-dark);
}

.navbar__names {
  font-family: var(--font-display);
  font-size: var(--fs-display-sm);
  font-weight: 600;
  color: var(--text-primary);
}

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

.navbar__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  padding-block: var(--space-1);
}

/* Sublinhado que cresce do centro no hover. */
.navbar__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--serenity);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.navbar__link:hover::after,
.navbar__link:focus-visible::after {
  width: 100%;
}

/* --- Botão de menu: escondido no desktop, exibido em responsive.css --- */
.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.navbar__toggle-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--text-primary);
  border-radius: var(--radius-pill);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}