/* ============================================================
   LITHIUM.IE — Navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition-base), background var(--transition-base);
}

.nav--scrolled {
  border-color: var(--color-border-green);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
  color: var(--color-heading);
  transition: opacity var(--transition-fast);
}
.nav__logo:hover { opacity: 0.85; }

.nav__logo-mark {
  width: 32px;
  height: 32px;
  background: var(--gradient-green-purple);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 900;
  color: #fff;
}

.nav__logo-text span {
  background: var(--gradient-green-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: 0.4rem var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.nav__link:hover {
  color: var(--color-heading);
  background: rgba(255,255,255,0.05);
}
.nav__link--active {
  color: var(--color-green-glow);
  background: var(--color-green-subtle);
}

/* CTA */
.nav__cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Hamburger (mobile) */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6) var(--space-6);
  flex-direction: column;
  gap: var(--space-2);
  z-index: 99;
}
.nav__mobile--open { display: flex; }

.nav__mobile-link {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.nav__mobile-link:hover,
.nav__mobile-link--active {
  color: var(--color-green-glow);
  background: var(--color-green-subtle);
}

@media (max-width: 768px) {
  .nav__links, .nav__cta { display: none; }
  .nav__hamburger { display: flex; }
  .nav__inner { padding: 0 var(--space-4); }
}