.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-paper-white);
  border-bottom: var(--border-thickness) solid var(--color-ink-black);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-2);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ink-black);
  min-width: 0;
  flex-shrink: 1;
}

.site-header__logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-h4);
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__brand-subtitle {
  font-size: var(--text-caption);
  color: var(--color-ink-black);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: var(--border-thickness) solid var(--color-ink-black);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: var(--color-solar-yellow);
}

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

.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-black);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

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

.site-header__toggle-icon::before {
  top: -7px;
}

.site-header__toggle-icon::after {
  top: 7px;
}

.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);
  min-width: 0;
  flex-shrink: 1;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
  flex-shrink: 1;
}

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

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

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-small);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-ink-black);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border: var(--border-thickness) solid transparent;
  border-radius: var(--radius-button);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav-link:hover {
  background-color: var(--color-solar-yellow);
  border-color: var(--color-ink-black);
  color: var(--color-ink-black);
}

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

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

@media (max-width: 1023px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-paper-white);
    border-bottom: var(--border-thickness) solid var(--color-ink-black);
    box-shadow: var(--shadow-flat);
    padding: var(--space-4);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    display: none;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    width: 100%;
  }

  .site-header__nav-link {
    display: block;
    width: 100%;
    padding: var(--space-3);
    text-align: left;
  }

  .site-header__cta {
    margin-top: var(--space-4);
    width: 100%;
  }
}

@media (max-width: 639px) {
  .site-header__inner {
    min-height: 64px;
  }

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

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

  .site-header__brand-subtitle {
    font-size: 0.625rem;
  }

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

  .site-header__nav {
    max-height: calc(100vh - 64px);
  }
}