/* ============================================
   NAVIGATION BAR
   ============================================ */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: 0 clamp(24px,4vw,60px);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(5,5,8,0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity 0.6s ease, transform 0.6s var(--ease-out-expo);
}

#main-nav.visible {
  opacity: 1;
  transform: translateY(0);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  cursor: pointer;
  transition: color 0.3s ease;
}

.nav-logo:hover { color: var(--neon-purple); }

.nav-links {
  display: flex;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.5rem 0;
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--neon-purple);
  transform: scaleX(0);
  transition: transform 0.3s var(--ease-out-expo);
  box-shadow: 0 0 8px var(--neon-purple-glow);
}

.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link.active {
  color: var(--neon-purple);
}
.nav-link.active::after {
  transform: scaleX(1);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.3s ease;
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px,4px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px,-4px); }

@media (max-width:768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(5,5,8,0.95);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1.2rem;
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out-expo);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}