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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

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

.site-header__brand:hover {
  color: var(--color-burgundy);
  text-decoration: none;
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  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-border);
  border-radius: var(--radius-1);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: var(--color-concrete-light);
  border-color: var(--color-electric-blue);
}

.site-header__toggle:focus-visible {
  outline: var(--color-focus-outline);
  outline-offset: 2px;
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink);
  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__nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-block;
  padding-block: var(--space-2);
  font-size: var(--text-small);
  line-height: var(--leading-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav-list a:hover {
  color: var(--color-electric-blue);
  border-bottom-color: var(--color-electric-blue);
  text-decoration: none;
}

.site-header__nav-list a[aria-current="page"] {
  color: var(--color-burgundy);
  border-bottom-color: var(--color-burgundy);
}

@media (max-width: 1024px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    display: none;
    width: 100%;
    order: 10;
    margin-left: 0;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: var(--space-3);
    border-top: 1px solid var(--color-border);
  }

  .site-header__nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__nav-list a {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-bottom: none;
  }

  .site-header__nav-list a:hover {
    background-color: var(--color-concrete-light);
    border-bottom: none;
  }

  .site-header__nav-list a[aria-current="page"] {
    background-color: var(--color-concrete-light);
    border-bottom: none;
  }
}

@media (max-width: 480px) {
  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__brand-text {
    font-size: var(--text-body);
  }

  .site-header__inner {
    min-height: 56px;
    padding-block: var(--space-2);
    gap: var(--space-3);
  }
}