/* Header styles build on base.css */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(26, 32, 40, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

/* Brand */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.5px;
}
.logo-mark {
  width: 14px;
  height: 14px;
  display: inline-block;
  transform: rotate(45deg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-jungle));
  border-radius: 2px;
  box-shadow: var(--shadow-glow);
}
.logo-text { font-size: var(--font-size-xl); }

/* Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-list a {
  display: inline-block;
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-base) var(--transition-ease), background var(--transition-base) var(--transition-ease);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-text);
  background: rgba(123, 75, 166, 0.15);
}

.nav-list a[aria-current="page"] {
  color: var(--color-accent-mystical);
  font-weight: var(--font-weight-semibold);
}

/* Search */
.site-search {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.site-search .form-control {
  max-width: 220px;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-base);
  align-items: center;
  justify-content: center;
  position: relative;
}
.nav-toggle .nav-toggle-bar {
  position: absolute;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base) var(--transition-ease), opacity var(--transition-base) var(--transition-ease);
}
.nav-toggle .nav-toggle-bar:nth-child(1) { transform: translateY(-6px); }
.nav-toggle .nav-toggle-bar:nth-child(2) { transform: translateY(0); }
.nav-toggle .nav-toggle-bar:nth-child(3) { transform: translateY(6px); }

/* Open state animation */
.site-header.is-open .nav-toggle .nav-toggle-bar:nth-child(1) { transform: rotate(45deg); }
.site-header.is-open .nav-toggle .nav-toggle-bar:nth-child(2) { opacity: 0; }
.site-header.is-open .nav-toggle .nav-toggle-bar:nth-child(3) { transform: rotate(-45deg); }

/* Responsive: mobile first visibility without JS */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    width: 100%;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--color-background-elevated);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-4) var(--container-padding);
    align-items: stretch;
    justify-content: stretch;
    gap: var(--space-4);
  }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .site-search { width: 100%; }
  .site-search .form-control { flex: 1; max-width: none; }

  /* Progressive enhancement: hide only when JS added .menu-enhanced */
  .site-header.menu-enhanced .primary-nav { display: none; }
  .site-header.menu-enhanced.is-open .primary-nav { display: flex; }
}

@media (min-width: 1025px) {
  .primary-nav { position: static; }
  .site-search .form-control { max-width: 260px; }
}