.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-surface-navy);
  -webkit-backdrop-filter: blur(var(--blur-panel));
  backdrop-filter: blur(var(--blur-panel));
  border-bottom: 1px solid var(--color-border-lavender);
  box-shadow: 0 2px 12px var(--color-shadow-navy);
}

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

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

.site-header__brand:hover {
  text-decoration: none;
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-medium);
  background: transparent;
  border: 1px solid var(--color-border-lavender);
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

.site-header__toggle:hover {
  background: rgba(169, 155, 199, 0.15);
  border-color: var(--color-border-teal);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-parchment);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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__nav {
  display: block;
}

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

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

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-small);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-parchment);
  text-decoration: none;
  border-radius: var(--radius-small);
  transition: color var(--transition-base), background-color var(--transition-base), text-decoration-color var(--transition-base);
  white-space: nowrap;
}

.site-header__nav-link:hover {
  color: var(--color-teal-glow);
  text-decoration: underline;
  text-decoration-color: var(--color-teal-glow);
  text-underline-offset: 0.25em;
  background-color: rgba(169, 155, 199, 0.1);
}

.site-header__nav-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

@media (max-width: 900px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

  .site-header__brand-text {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-deep-plum);
    -webkit-backdrop-filter: blur(var(--blur-panel));
    backdrop-filter: blur(var(--blur-panel));
    border-bottom: 1px solid var(--color-border-lavender);
    box-shadow: 0 8px 20px var(--color-shadow-navy);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    padding: var(--space-md) var(--container-padding);
    display: none;
  }

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

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

  .site-header__nav-link {
    display: flex;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-body);
    border-radius: var(--radius-medium);
  }
}

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

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

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