.site-header {
  position: sticky;
  top: 0;
  margin-bottom: -4.5rem;
  z-index: 50;
  background: transparent;
  transition: background-color 200ms ease;
}
.site-header.is-scrolled {
  background: var(--color-nevoa);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}
.site-header__logo-img { height: 2rem; width: auto; }
.site-header__logo-img--pos { display: none; }
.site-header.is-scrolled .site-header__logo-img--neg { display: none; }
.site-header.is-scrolled .site-header__logo-img--pos { display: block; }

.site-header__menu-toggle {
  display: flex;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
}

.site-nav {
  display: none;
  align-items: center;
  gap: var(--space-4);
}
@media (min-width: 640px) {
  .site-nav { display: flex; }
  .site-header__menu-toggle { display: none; }
}
@media (min-width: 640px) and (max-width: 767.98px) {
  .site-nav { gap: var(--space-2); }
}
.site-nav__link {
  font-family: var(--font-text);
  font-weight: 500;
  font-size: var(--fs-interface);
  color: var(--color-grafite);
}
.site-header:not(.is-scrolled) .site-nav__link { color: #FFFFFF; }
.site-header:not(.is-scrolled) .site-header__menu-toggle { color: #FFFFFF; }

.site-header__menu-icon,
.site-header__menu-icon::before,
.site-header__menu-icon::after {
  display: block;
  width: 1.5rem;
  height: 2px;
  background: currentColor;
  position: relative;
}
.site-header__menu-icon::before, .site-header__menu-icon::after {
  content: "";
  position: absolute;
}
.site-header__menu-icon::before { top: -6px; }
.site-header__menu-icon::after { top: 6px; }

@media (max-width: 639.98px) {
  .site-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-nevoa);
    padding: var(--space-2) var(--space-3);
  }
  .site-nav.is-open { display: flex; }
  .site-nav__link { padding: var(--space-2) 0; color: var(--color-grafite) !important; }
}

.site-footer {
  background: var(--color-preto-byte);
  color: var(--color-nevoa);
  padding-block: var(--space-8);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
}
.site-footer__phrase {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-title-3);
  color: var(--color-violeta-claro);
}
.site-footer__links { display: flex; gap: var(--space-3); }
.site-footer__links a { color: var(--color-lavanda); font-size: var(--fs-body-sm); }
.site-footer__year { color: var(--color-cinza-medio); font-size: var(--fs-caption); }