/* Site header: logo, primary navigation, mobile disclosure menu. */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-dark);
  border-bottom: 1px solid var(--color-dark-line);
}

.site-header__inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

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

.site-header__logo {
  width: auto;
  height: 58px;
  object-fit: contain;
}

/* --- Navigation --------------------------------------------------------- */

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

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

.site-nav__link {
  display: inline-block;
  padding-block: var(--space-2);
  color: var(--color-on-dark);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
}

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

.site-nav__link.is-active {
  color: var(--color-on-dark);
  border-bottom-color: var(--color-blue);
}

/* --- Mobile toggle ------------------------------------------------------ */

.site-header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.site-header__toggle-bar {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--color-on-dark);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 860px) {
  .site-header__toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    padding: var(--space-5) var(--container-pad) var(--space-6);
    background: var(--color-dark);
    border-bottom: 1px solid var(--color-dark-line);
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    padding-block: var(--space-3);
    border-bottom: 1px solid var(--color-dark-line);
  }

  .site-nav__link.is-active {
    color: var(--color-blue);
  }

  .site-header__logo {
    height: 46px;
  }
}