.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg-base);
  border-bottom: var(--border-default);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  min-height: 4rem;
  padding-block: var(--space-8);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  color: var(--color-text-primary);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--target-size-min);
  height: var(--target-size-min);
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.site-header__toggle-icon,
.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  position: relative;
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-header__toggle-icon::before {
  top: -0.5rem;
}

.site-header__toggle-icon::after {
  top: 0.5rem;
}

.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(0.5rem) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  transform: translateY(-0.5rem) rotate(-45deg);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-bg-base);
  border-bottom: var(--border-default);
  padding: var(--space-16) var(--container-padding-mobile) var(--space-24);
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  z-index: 999;
}

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

.site-header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

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

.site-header__nav-link {
  display: block;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
}

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

.site-header__nav-link:focus-visible {
  outline: var(--border-focus);
  outline-offset: var(--border-focus-offset);
  border-radius: var(--radius-control);
}

.site-header__cta {
  margin-top: var(--space-16);
  width: 100%;
}

@media (min-width: 64rem) {
  .site-header__inner {
    min-height: 4.5rem;
  }

  .site-header__logo {
    width: 2.5rem;
    height: 2.5rem;
  }

  .site-header__brand-text {
    font-size: 1.25rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: var(--space-24);
    background: none;
    border: none;
    padding: 0;
    max-height: none;
    overflow: visible;
    z-index: auto;
  }

  .site-header__nav-list {
    flex-direction: row;
    gap: var(--space-16);
  }

  .site-header__nav-link {
    padding: var(--space-8) 0;
  }

  .site-header__cta {
    margin-top: 0;
    width: auto;
    flex-shrink: 0;
  }
}