/* Header styles scoped to the header component */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background: linear-gradient(90deg, var(--color-bg-secondary), var(--color-bg-accent));
  box-shadow: var(--shadow-base);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  width: auto;
  height: auto;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-lg);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  position: relative;
}

.brand .site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: var(--font-weight-extrabold);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}
.brand-icon {
  font-size: 1.25em;
}

/* Navigation */
.primary-nav .nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-item a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}
.nav-item a:hover {
  background: var(--color-secondary-light);
  color: var(--color-text-primary);
  transform: translateY(-1px);
}
.nav-item a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.menu-toggle .burger { display: inline-flex; flex-direction: column; gap: 5px; }
.menu-toggle .line {
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

/* Responsive behavior */
@media (max-width: 768px) {
  .menu-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    left: var(--space-4);
    right: var(--space-4);
    top: calc(100% + var(--space-3));
    background: var(--color-bg-primary);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
  }
  .primary-nav .nav-list { flex-direction: column; align-items: stretch; gap: var(--space-2); }
  .primary-nav .nav-item a { padding: var(--space-3) var(--space-4); }

  /* Progressive enhancement: hide only when JS is enabled */
  html.js-enabled .primary-nav { display: none; }
  html.js-enabled .primary-nav.is-open { display: block; animation: slideDown var(--transition-slow); }
}

@keyframes slideDown { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

/* Larger screens */
@media (min-width: 769px) {
  .primary-nav { display: block !important; }
}