.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-abyss);
  border-bottom: 1px solid var(--color-basalt);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 64px;
  padding-block: var(--space-sm);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  display: block;
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-sand);
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-basalt);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-color), background-color var(--transition-color);
}

.site-header__toggle:hover {
  border-color: var(--color-amber);
}

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

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-sand);
  transition: transform var(--transition-transform), opacity var(--transition-opacity), background-color var(--transition-color);
}

.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__nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-item {
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-block;
  padding-block: var(--space-xs);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-sand);
  white-space: nowrap;
  transition: color var(--transition-color);
}

.site-header__nav-link:hover {
  color: var(--color-amber);
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-amber);
  border-bottom: 2px solid var(--color-amber);
}

@media (max-width: 991px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    display: block;
    background-color: var(--color-abyss);
    padding: var(--space-lg) var(--container-padding-mobile);
    overflow-y: auto;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform var(--transition-transform), visibility var(--transition-transform);
  }

  .site-header__nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: 1.25rem;
    border-left: 2px solid transparent;
  }

  .site-header__nav-link:hover {
    border-left-color: var(--color-amber);
  }

  .site-header__nav-link[aria-current="page"] {
    border-left-color: var(--color-amber);
    border-bottom: none;
  }
}

@media (max-width: 767px) {
  .site-header__inner {
    min-height: 56px;
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__brand-text {
    font-size: 1rem;
  }

  .site-header__nav {
    top: 56px;
  }
}