/* ============================================================
   nav.css — top utility bar, sticky main nav, mobile nav drawer.
   ============================================================ */

/* -------------------- Top utility bar -------------------- */
.utility-bar {
  background: #050507;
  color: #ECFDF5;
  font-size: 0.85rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--on-dark-border);
}
.utility-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.utility-bar a { color: #ECFDF5; font-weight: 500; }
.utility-bar a:hover { color: var(--tint); }
.utility-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}
.utility-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tint);
}

/* -------------------- Main nav (DARK) -------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--on-dark-border);
}
.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.95rem;
  padding-bottom: 0.95rem;
  gap: 1rem;
}
.brand {
  font-family: var(--serif-display);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--on-dark-heading);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
@media (max-width: 360px) {
  .brand { font-size: 0.92rem; gap: 0.4rem; }
  .brand::before { width: 7px; height: 7px; }
}
.brand::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-glow);
  box-shadow: 0 0 12px var(--primary-glow);
}
.nav-links {
  display: none;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 992px) {
  .nav-links { display: flex; }
}
.nav-links a {
  color: var(--on-dark-muted);
  font-weight: 500;
  font-size: 0.92rem;
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary-glow);
  box-shadow:
    0 0 6px var(--primary-glow),
    0 0 14px rgba(45, 212, 191, 0.55);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}
.nav-links a:hover { color: var(--on-dark-heading); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  display: flex;
  gap: 0.65rem;
  align-items: center;
}
@media (max-width: 991px) {
  .nav-cta .btn { display: none; }
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  /* WCAG 2.5.5 minimum touch target = 44×44 */
  width: 44px;
  height: 44px;
  background: var(--dark-elev-2);
  border: 1px solid var(--on-dark-border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--on-dark-heading);
  position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--on-dark-heading);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
@media (min-width: 992px) {
  .nav-toggle { display: none; }
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--black);
  padding: 0 1.25rem;
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  border-top: 1px solid transparent;
  transition:
    max-height 0.34s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.22s ease,
    padding 0.34s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.2s ease,
    visibility 0s linear 0.34s;
}
.mobile-nav.show {
  max-height: 460px;
  opacity: 1;
  visibility: visible;
  padding: 1rem 1.25rem;
  border-top-color: var(--on-dark-border);
  transition:
    max-height 0.34s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.22s ease 0.05s,
    padding 0.34s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.2s ease,
    visibility 0s linear 0s;
}
.mobile-nav a {
  color: var(--on-dark-text);
  font-weight: 500;
  padding: 0.5rem 0;
  transform: translateX(-6px);
  opacity: 0;
  transition:
    transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.22s ease;
}
.mobile-nav.show a {
  transform: translateX(0);
  opacity: 1;
}
.mobile-nav.show a:nth-child(1) { transition-delay: 0.06s; }
.mobile-nav.show a:nth-child(2) { transition-delay: 0.10s; }
.mobile-nav.show a:nth-child(3) { transition-delay: 0.14s; }
.mobile-nav.show a:nth-child(4) { transition-delay: 0.18s; }
.mobile-nav.show a:nth-child(5) { transition-delay: 0.22s; }
@media (min-width: 992px) { .mobile-nav { display: none !important; } }
@media (prefers-reduced-motion: reduce) {
  .mobile-nav, .mobile-nav a, .mobile-nav.show a { transition: none !important; }
}