/* ═══════════════════════════════════════════════════════════════
   QNFO UNIFIED NAVIGATION v1.0
   Part of QNFO Design System — qnfo-design-system.pages.dev
   Deployed: 2026-05-30
   Unified top nav + footer for all *.qnfo.org and *.qwav.tech sites
   ═══════════════════════════════════════════════════════════════ */

/* ── Nav Bar ── */
.qnfo-nav {
  font-family: var(--qnfo-sans);
  font-size: 0.8rem;
  background: var(--qnfo-bg);
  border-bottom: 1px solid var(--qnfo-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.qnfo-nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  gap: 1rem;
}

/* ── Logo ── */
.qnfo-nav-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--qnfo-text);
  flex-shrink: 0;
}
.qnfo-nav-logomark {
  font-family: var(--qnfo-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--qnfo-accent);
}
.qnfo-nav-wordmark {
  font-family: var(--qnfo-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--qnfo-muted);
}

/* ── Nav Links ── */
.qnfo-nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.qnfo-nav-link {
  color: var(--qnfo-muted);
  text-decoration: none;
  font-size: 0.78rem;
  transition: color 0.15s;
  white-space: nowrap;
}
.qnfo-nav-link:hover { color: var(--qnfo-accent); text-decoration: none; }

/* ── Dropdown ── */
.qnfo-nav-dropdown { position: relative; }
.qnfo-nav-trigger {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 0.25rem 0.35rem;
  border-radius: 4px;
  color: var(--qnfo-muted);
  transition: color 0.15s, background 0.15s;
}
.qnfo-nav-trigger:hover { color: var(--qnfo-accent); background: var(--qnfo-card-bg); }
.qnfo-nav-caret {
  font-size: 0.55rem;
  color: var(--qnfo-muted);
  transition: transform 0.2s;
}
.qnfo-nav-dropdown:hover .qnfo-nav-caret,
.qnfo-nav-dropdown:focus-within .qnfo-nav-caret { transform: rotate(180deg); }

.qnfo-nav-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.35rem;
  background: var(--qnfo-bg);
  border: 1px solid var(--qnfo-border);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  min-width: 220px;
  padding: 0.4rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s, visibility 0.15s, transform 0.15s;
  z-index: 200;
}
.qnfo-nav-dropdown:hover .qnfo-nav-menu,
.qnfo-nav-dropdown:focus-within .qnfo-nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.qnfo-nav-item {
  display: block;
  padding: 0.4rem 1rem;
  color: var(--qnfo-text-light);
  text-decoration: none;
  font-size: 0.78rem;
  transition: color 0.12s, background 0.12s;
  white-space: nowrap;
}
.qnfo-nav-item:hover { color: var(--qnfo-accent); background: var(--qnfo-card-bg); text-decoration: none; }
.qnfo-nav-item.active { color: var(--qnfo-accent); font-weight: 600; }

/* ── Footer Links ── */
.qnfo-footer-links {
  font-family: var(--qnfo-sans);
  font-size: 0.72rem;
  color: var(--qnfo-muted);
  line-height: 2;
  text-align: center;
}
.qnfo-footer-link-group { margin-bottom: 0.5rem; }
.qnfo-footer-link-label {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.65rem;
  color: var(--qnfo-accent);
  margin-right: 0.5rem;
}
.qnfo-footer-links a {
  color: var(--qnfo-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.qnfo-footer-links a:hover { color: var(--qnfo-accent); text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .qnfo-nav-inner { padding: 0 1rem; height: 40px; }
  .qnfo-nav-links { gap: 0.5rem; flex-wrap: nowrap; overflow-x: auto; -ms-overflow-style: none; scrollbar-width: none; }
  .qnfo-nav-links::-webkit-scrollbar { display: none; }
  .qnfo-nav-wordmark { display: none; }
  .qnfo-nav-link { font-size: 0.72rem; }
  .qnfo-nav-menu { left: auto; right: 0; }
  .qnfo-footer-links { font-size: 0.68rem; }
}

/* ── Chapter Navigation ── */
.qnfo-chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 0;
  margin: 0 0 2rem;
  border-top: 1px solid var(--qnfo-border);
  border-bottom: 1px solid var(--qnfo-border);
  font-family: var(--qnfo-sans);
  font-size: 0.82rem;
}
.qnfo-chapter-nav a {
  color: var(--qnfo-accent);
  text-decoration: none;
  transition: opacity 0.15s;
}
.qnfo-chapter-nav a:hover { opacity: 0.7; text-decoration: none; }
.qnfo-chapter-current {
  font-weight: 600;
  color: var(--qnfo-text);
  font-size: 0.78rem;
}
.qnfo-chapter-toc {
  color: var(--qnfo-muted) !important;
  font-size: 0.85rem;
}
.qnfo-chapter-prev::before { content: '\2190\00a0'; }
.qnfo-chapter-next::after { content: '\00a0\2192'; }

@media (max-width: 768px) {
  .qnfo-chapter-nav { font-size: 0.75rem; padding: 0.6rem 0; }
  .qnfo-chapter-current { font-size: 0.7rem; }
}

/* ── QWAV dark theme nav override ── */
[data-brand="qwav"] .qnfo-nav {
  background: var(--qnfo-bg);
  border-bottom-color: var(--qnfo-border);
}