.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

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

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo img,
.site-logo svg {
  height: 2rem;
  width: auto;
}

.site-logo img[src*="official"] {
  height: 1.85rem;
}

.site-logo__wordmark {
  font-size: 1.35rem;
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.site-logo__wordmark span {
  font-weight: var(--fw-regular);
  margin-left: 0.25rem;
  color: var(--color-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-actions .btn {
  white-space: nowrap;
}

.mobile-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.mobile-menu-toggle[aria-expanded="true"] {
  background: var(--color-surface);
}

@media (min-width: 1100px) {
  .mobile-menu-toggle {
    display: none;
  }
}

@media (max-width: 1099px) {
  .header-actions .btn--ghost,
  .header-actions .btn--primary {
    display: none;
  }

  .header-actions .btn--login-mobile {
    display: inline-flex;
  }
}

@media (min-width: 1100px) {
  .header-actions .btn--login-mobile {
    display: none;
  }
}