nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 2.5rem;
  background: rgba(11,22,40,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: padding var(--transition);
}
nav.scrolled { padding: 0.65rem 2.5rem; }

.nav-logo {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.1rem; color: var(--blue); letter-spacing: -0.02em;
}

.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  color: var(--slate); font-size: 0.875rem;
  font-weight: 500; transition: color var(--transition);
}
.nav-links a:hover { color: var(--white); }

.nav-burger { display: none; color: var(--white); font-size: 1.4rem; }

@media (max-width: 600px) {
  .nav-burger { display: block; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--navy-light); border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.9rem 2rem; border-top: 1px solid var(--border); }
}