.site-header {
  position: relative;
  z-index: 100;
}

.site-header__bar {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
  width: min(calc(100% - 2.5rem), var(--container-max));
  min-height: 4rem;
  margin: var(--space-3) auto 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-milk);
  box-shadow: var(--shadow-soft);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-graphite);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
}

.site-header__logo {
  flex: 0 0 auto;
  width: 1.875rem;
  height: 1.875rem;
  object-fit: contain;
}

.site-header__brand-text {
  min-width: 0;
}

.site-header__toggle {
  display: inline-grid;
  flex: 0 0 auto;
  width: 2.75rem;
  min-height: 2.75rem;
  place-content: center;
  gap: 0.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-milk);
}

.site-header__toggle-line {
  display: block;
  width: 1.125rem;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-graphite);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.375rem) 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(-0.375rem) rotate(-45deg);
}

.site-header__navigation {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  left: 0;
  display: grid;
  gap: var(--space-4);
  max-height: min(70vh, 34rem);
  padding: var(--space-5);
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-milk);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-0.5rem);
  transition: opacity var(--transition-panel), transform var(--transition-panel), visibility var(--transition-panel);
  visibility: hidden;
}

.site-header__navigation.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  visibility: visible;
}

.site-header__links,
.site-header__links li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__links {
  display: grid;
  gap: var(--space-2);
}

.site-header__links a {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.25;
}

.site-header__cta {
  justify-self: start;
}

.site-header__toggle:focus-visible,
.site-header__brand:focus-visible,
.site-header__links a:focus-visible,
.site-header__cta:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 3px;
}

@media (min-width: 1025px) {
  .site-header {
    position: fixed;
    top: var(--space-4);
    left: var(--space-4);
    width: 5.5rem;
  }

  .site-header__bar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-5);
    width: 5.5rem;
    min-height: 26.25rem;
    margin: 0;
    padding: var(--space-4) var(--space-2);
    border-radius: 2rem;
  }

  .site-header__brand {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }

  .site-header__logo {
    width: 2.25rem;
    height: 2.25rem;
  }

  .site-header__brand-text {
    font-size: var(--text-xs);
    line-height: 1.25;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__navigation {
    position: static;
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    justify-content: space-between;
    gap: var(--space-4);
    max-height: none;
    padding: 0;
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition: none;
    visibility: visible;
  }

  .site-header__links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
  }

  .site-header__links a {
    padding: 0;
    font-size: var(--text-xs);
    line-height: 1.25;
    text-align: center;
  }

  .site-header__cta {
    align-self: stretch;
    min-height: 2.75rem;
    padding: var(--space-2);
    font-size: 0.6875rem;
    line-height: 1.15;
  }
}

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