/* ── Site Navigation ── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: var(--space-4) 0;
  transition: all var(--duration-normal) var(--ease-in-out);
}
.site-nav.scrolled {
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-md);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-black);
  color: #fff;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.nav-logo-mark {
  width: 36px; height: 36px;
  background: var(--gradient-accent);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: var(--shadow-glow-violet);
}
.nav-logo span { color: var(--color-accent-300); }

/* Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}
.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-neutral-300);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast);
  position: relative;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--color-accent-300); }

/* Dropdown */
.nav-item { position: relative; }
.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 540px;
  background: rgba(13,21,48,0.97);
  backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(-8px);
  transition: all var(--duration-normal) var(--ease-out-expo);
  box-shadow: var(--shadow-lg);
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  transition: background var(--duration-fast);
  cursor: pointer;
}
.dropdown-item:hover { background: rgba(124,58,237,0.1); }
.dropdown-item__icon {
  width: 36px; height: 36px; flex-shrink: 0;
  background: rgba(124,58,237,0.15);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.dropdown-item__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-neutral-100);
  margin-bottom: 2px;
}
.dropdown-item__desc {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
  line-height: 1.4;
}

/* Nav CTA */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* ── Mobile Nav ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
}
.nav-hamburger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--duration-normal) var(--ease-out-expo);
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,15,30,0.98);
  backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal);
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}
.mobile-menu .nav-links {
  flex-direction: column;
  gap: var(--space-4);
  text-align: center;
}
.mobile-menu .nav-link {
  font-size: var(--text-2xl);
  font-family: var(--font-display);
  color: var(--color-neutral-100);
}
.mobile-menu .nav-link:hover { color: var(--color-accent-300); background: none; }

@media (max-width: 768px) {
  .nav-links:not(.mobile-menu .nav-links),
  .nav-actions .btn--ghost { display: none; }
  .nav-hamburger { display: flex; }
  .mobile-menu { display: flex; }
}