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

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  min-height: 64px;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav--left {
  justify-content: flex-start;
}

.site-header__nav--right {
  justify-content: flex-end;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-color);
  white-space: nowrap;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-transform);
}

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

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

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

.site-header__nav-link--cta {
  color: var(--accent-primary);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--text-primary);
  min-width: 0;
  flex-shrink: 0;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  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(--border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-color), border-color var(--transition-color);
}

.site-header__toggle:hover {
  background-color: var(--surface-2);
  border-color: var(--accent-primary);
}

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-transform), opacity 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__mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--bg-base);
  border-bottom: 1px solid var(--border-default);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  z-index: 1001;
  padding: var(--space-3) var(--container-padding);
}

.site-header__mobile-nav.is-open {
  display: block;
}

.site-header__mobile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.site-header__mobile-link {
  display: block;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-color), color var(--transition-color), border-color var(--transition-color);
}

.site-header__mobile-link:hover {
  background-color: var(--surface-2);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

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

@media (max-width: 1024px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-2);
  }

  .site-header__nav {
    display: none;
  }

  .site-header__brand {
    justify-self: center;
  }

  .site-header__toggle {
    display: flex;
    justify-self: end;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    min-height: 56px;
  }

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

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

  .site-header__mobile-nav {
    max-height: calc(100vh - 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav-link::after,
  .site-header__toggle-line {
    transition: none;
  }
}