/* =========================================================
   TOPBAR / HEADER
   ========================================================= */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(24px);
  transition:
    background-color var(--transition-base),
    backdrop-filter var(--transition-base),
    -webkit-backdrop-filter var(--transition-base),
    box-shadow var(--transition-base);
}

/* Estado: rolou a página */
.topbar.scrolled {
  background: rgba(255, 255, 255, 1);
  backdrop-filter: blur(5px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.15), 0 2px 16px rgba(0, 0, 0, 0.06);
}

/* --- Layout interno: 3 colunas --- */
.topbar__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-15);
  gap: var(--space-12);
}

/* =========================================================
   NAVEGAÇÃO (coluna esquerda)
   ========================================================= */

.topbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.topbar__nav-link {
  font-family: var(--font-base);
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.90);
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color var(--transition-fast), opacity var(--transition-fast);
  position: relative;
}

/* underline animado */
.topbar__nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: currentColor;
  transition: width var(--transition-base);
}

.topbar__nav-link:hover::after,
.topbar__nav-link.active::after {
  width: 100%;
}

/* Quando scrolled: links escurecem para ficar legíveis no fundo branco */
.topbar.scrolled .topbar__nav-link {
  color: var(--color-dark);
}

.topbar.scrolled .topbar__nav-link:hover {
  color: var(--color-primary);
}

/* =========================================================
   LOGO (coluna central)
   ========================================================= */

.topbar__logo {
  justify-self: center;
  display: flex;
  align-items: center;
  transition: 100ms ease-in-out;
}

.topbar__logo:hover {
  transform: scale(1.05);
  transition: 100ms ease-in-out;
}

.topbar__logo-img {
  height: 40px;
  width: auto;
  /* A logo é clara — ao rolar, inverte para ficar legível no fundo branco */
  transition: filter var(--transition-base);
}

.topbar.scrolled .topbar__logo-img {
  filter: none;
}

/* =========================================================
   IDIOMAS (coluna direita)
   ========================================================= */

.topbar__lang {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-self: end;
}

.topbar__lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
  border-radius: var(--radius-sm);
  opacity: 0.50;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  line-height: 0;
}

.topbar__lang-btn img {
  display: block;
  border-radius: 2px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.30);
}

.topbar__lang-btn:hover {
  opacity: 0.85;
  transform: scale(1.10);
}

.topbar__lang-btn.active {
  opacity: 1;
  outline: 2px solid rgba(255, 255, 255, 0.80);
  outline-offset: 2px;
  border-radius: 3px;
}

.topbar.scrolled .topbar__lang-btn.active {
  outline-color: var(--color-primary);
}

/* =========================================================
   HAMBURGER
   ========================================================= */

.topbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  justify-self: end;
}

.topbar__hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.topbar.scrolled .topbar__hamburger span {
  background-color: var(--color-dark);
}

/* Estado aberto — anima para X */
.topbar__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.topbar__hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.topbar__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   DRAWER (menu lateral mobile)
   ========================================================= */

.topbar__drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(260px, 68vw);
  height: 100dvh;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.10);
  display: flex;
  flex-direction: column;
  padding: calc(var(--header-height) + var(--space-6)) var(--space-6) var(--space-8);
  gap: var(--space-6);
  transform: translateX(100%);
  /* ao fechar: visibility some somente após o transform terminar */
  visibility: hidden;
  transition: transform var(--transition-base), visibility 0s var(--transition-base);
  z-index: 99;
}

.topbar__drawer.open {
  transform: translateX(0);
  visibility: visible;
  /* ao abrir: visibility aparece imediatamente, sem delay */
  transition: transform var(--transition-base), visibility 0s;
}

/* Overlay escuro atrás do drawer */
.topbar__drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.50);
  z-index: 98;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.topbar__drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.drawer__link {
  font-family: var(--font-base);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  padding-block: var(--space-3);
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.drawer__link:hover {
  color: var(--color-primary);
  padding-left: var(--space-2);
}

.drawer__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  line-height: 0;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.drawer__close:hover {
  color: var(--color-dark);
  background-color: rgba(0, 0, 0, 0.06);
}

.drawer__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.drawer__header-label {
  font-family: var(--font-base);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

.drawer__header-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.3;
}

.drawer__lang {
  display: flex;
  gap: var(--space-4);
  margin-top: auto;
  justify-content: center;
}

.drawer__lang .topbar__lang-btn.active {
  outline-color: var(--color-primary);
}

/* =========================================================
   RESPONSIVO
   ========================================================= */

@media (max-width: 900px) {
  .topbar__nav,
  .topbar__lang {
    display: none;
  }

  .topbar__inner {
    grid-template-columns: auto 1fr auto;
    padding-inline: var(--space-6);
    gap: var(--space-4);
  }

  .topbar__logo {
    justify-self: start;
  }

  .topbar__hamburger {
    display: flex;
    grid-column: 3;
  }
}