/* header.css — Figma "Header" (4236:2207). Dois estados: Default e scroll (.is-stuck), ligado pelo main.js. */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding-block: var(--dm-space-16);
  color: var(--dm-white);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.98),
    rgba(0, 0, 0, 0)
  );
  opacity: 0;
  transform-origin: top;
  transition:
    opacity 0.4s var(--dm-ease),
    transform 0.4s var(--dm-ease);
  pointer-events: none;
}

.site-header.is-stuck::before {
  opacity: 1;
  transform: scaleY(0.7826);
}

/* ⚠ position + z-index não são decoração: o painel mobile é irmão deste elemento e cobre a tela (inset:0).
   Sem contexto de empilhamento aqui, o painel pinta por cima do botão do menu e ele para de fechar. */
.site-header__inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--dm-space-40);
}

/* Logo — dois assets sobrepostos (completo e marca), cross-fade por opacity */

.site-header__logo {
  position: relative;
  display: block;
  flex-shrink: 0;
  width: clamp(140px, 10.417vw, 200px);
  aspect-ratio: 200 / 83;
  transform-origin: left top;
  transition: transform 0.4s var(--dm-ease);
}

.site-header.is-stuck .site-header__logo {
  transform: scale(0.7);
}

.site-header__logo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left top;
  transition: opacity 0.4s var(--dm-ease);
}

.site-header__logo-mark {
  opacity: 0;
}

.site-header.is-stuck .site-header__logo-full {
  opacity: 0;
}

.site-header.is-stuck .site-header__logo-mark {
  opacity: 1;
}

/* Navegação */

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--dm-space-40);
}

.site-nav__list a {
  text-transform: uppercase;
}

/* Botão do menu mobile */

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;   /* alvo de toque mínimo */
  height: 44px;
}

.site-header__toggle-bar {
  display: block;
  width: 24px;
  height: 1px;
  margin-inline: auto;
  background-color: var(--dm-white);
  transition: transform 0.3s var(--dm-ease), opacity 0.3s var(--dm-ease);
}

/* ⚠ :not(:last-child), não :first-child — o primeiro filho do botão é o .screen-reader-text,
   então :first-child nunca casa com uma barra de verdade. */
[data-menu-toggle][aria-expanded="true"] .site-header__toggle-bar:not(:last-child) {
  transform: translateY(4px) rotate(45deg);
}

[data-menu-toggle][aria-expanded="true"] .site-header__toggle-bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Painel mobile — fora da tela por transform (compositor), nunca por display/height */

.site-menu-mobile {
  position: fixed;
  inset: 0;
  z-index: 1;          /* abaixo do .site-header__inner — ver a nota lá */
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--dm-container-padding);
  background-color: var(--dm-grey-10);
  color: var(--dm-white);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-1rem);
  transition:
    opacity 0.4s var(--dm-ease),
    transform 0.4s var(--dm-ease),
    visibility 0s linear 0.4s;
}

.site-menu-mobile.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.site-menu-mobile__list {
  display: flex;
  flex-direction: column;
  gap: var(--dm-space-24);
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .site-header__toggle { display: flex; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header::before,
  .site-header__logo,
  .site-header__logo img,
  .site-menu-mobile {
    transition: none;
  }
}