/* ── Mobile Navigation ── */
#mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  z-index: 999;
}

#mobile-nav.open {
  transform: translateY(0);
}

#header.scrolled {
  background: rgba(8, 11, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}