.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface-white);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 72px;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

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

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-ink-dark);
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-small);
  background-color: var(--color-surface-white);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
  z-index: 1000;
}

.site-header__toggle:hover {
  background-color: var(--color-background-light);
  border-color: var(--color-ink-dark);
}

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

.site-header__toggle-icon,
.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink-dark);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  content: "";
}

.site-header__toggle-icon {
  position: relative;
}

.site-header__toggle-icon::before {
  position: absolute;
  top: -7px;
  left: 0;
}

.site-header__toggle-icon::after {
  position: absolute;
  top: 7px;
  left: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
  background-color: transparent;
}

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

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

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-2) 0;
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: var(--text-body-line-height);
  color: var(--color-ink-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--color-accent-blue);
  text-decoration: none;
}

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

.site-header__cta {
  flex-shrink: 0;
}

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

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    max-width: 100%;
    background-color: var(--color-surface-white);
    box-shadow: -8px 0 24px rgba(0, 0, 0, 0.1);
    z-index: 60;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-4);
    overflow-y: auto;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform var(--transition-fast), visibility var(--transition-fast);
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-small);
  }

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

  .site-header__cta {
    margin-top: var(--space-2);
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__brand-text {
    font-size: 1.125rem;
  }
}