.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-charcoal-950);
  border-bottom: var(--border-brass-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--container-default);
  margin-inline: auto;
  padding: var(--space-3) var(--container-padding-mobile);
  min-height: 64px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ivory-100);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ivory-100);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

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

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

.site-header__toggle:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-charcoal-950);
  border-bottom: var(--border-brass-subtle);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  z-index: 999;
}

.site-header__nav.is-open {
  display: block;
}

.site-header__list {
  list-style: none;
  margin: 0;
  padding: var(--space-3) var(--container-padding-mobile) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.site-header__item {
  margin: 0;
}

.site-header__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-ivory-100);
  font-size: var(--text-body-size);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: var(--radius-1);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__link:hover {
  background-color: var(--color-charcoal-900);
  color: var(--color-felt-500);
}

.site-header__link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

@media (min-width: 64rem) {
  .site-header__inner {
    padding: var(--space-4) var(--container-padding-desktop);
    min-height: 72px;
  }

  .site-header__logo {
    width: 44px;
    height: 44px;
  }

  .site-header__brand-text {
    font-size: 0.9375rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    max-height: none;
    overflow: visible;
    background: none;
    border: none;
  }

  .site-header__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-5);
    padding: 0;
    margin: 0;
  }

  .site-header__item {
    margin: 0;
  }

  .site-header__link {
    display: inline-block;
    padding: var(--space-2) 0;
    font-size: var(--text-body-sm-size);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-ivory-300);
    border-bottom: 2px solid transparent;
    border-radius: 0;
    transition: color var(--transition-fast), border-color var(--transition-fast);
  }

  .site-header__link:hover {
    background: none;
    color: var(--color-ivory-100);
    border-bottom-color: var(--color-felt-500);
  }

  .site-header__link[aria-current="page"] {
    color: var(--color-ivory-100);
    border-bottom-color: var(--color-felt-500);
  }
}

@media (min-width: 80rem) {
  .site-header__list {
    gap: var(--space-6);
  }
}