/* Header (scoped) */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: linear-gradient(180deg, rgba(19,19,26,0.95) 0%, rgba(19,19,26,0.8) 100%);
  border-bottom: 1px solid var(--color-neutral-700);
  backdrop-filter: saturate(120%) blur(6px);
}

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

/* Brand */
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}
.brand-logo {
  width: 36px;
  height: 36px;
  display: inline-grid;
  place-items: center;
  color: var(--color-primary);
  background: radial-gradient(var(--color-primary-glow), transparent 60%);
  border-radius: var(--radius-full);
}
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Navigation */
.primary-nav { 
  /* Desktop default (visible) */
}
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  color: var(--color-text);
  transition: color var(--transition-base), background-color var(--transition-base), transform var(--transition-fast);
}
.nav-link:hover {
  color: var(--color-primary-light);
  background-color: var(--color-neutral-800);
}
.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}
.nav-link[aria-current="page"] {
  color: var(--color-primary);
}

/* Mobile toggle */
.menu-toggle {
  display: none;
  color: var(--color-text);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-neutral-600);
}
.menu-toggle:hover {
  background-color: var(--color-neutral-800);
}
.menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Mobile layout (progressive enhancement):
   We only collapse the menu when JS is enabled (html.has-js). */
@media (max-width: 1024px) {
  .menu-toggle { display: inline-flex; z-index: 99999;}
  .nav-list { gap: var(--space-4); }
}



/* Because some build tools don't allow nested media with class selector,
   we repeat selectors with .has-js prefix inside the media query. */
@media (max-width: 1024px) {
  .has-js .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(86vw, 320px);
    background-color: var(--color-background-elevated);
    border-left: 1px solid var(--color-neutral-700);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slower);
    display: none;
    flex-direction: column;
    padding: var(--space-8) var(--space-6);
    gap: var(--space-4);
    z-index: 10000;
  }
  .has-js .primary-nav .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
  .has-js .primary-nav.is-open {
    transform: translateX(0);
    display: flex;
  }
  .mobile-menu-backdrop {
    display: none;
  }
  .has-js .mobile-menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity var(--transition-slower);
    display: block;
    pointer-events: none;
  }
  .has-js .mobile-menu-backdrop.is-active {
    opacity: 1;
    pointer-events: auto;
  }
}

/* Reduce motion consideration is handled by base.css */