@media (max-width: 720px) {
  .intro {
    padding: 4rem 0 2rem;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0.75rem;
    right: 0.75rem;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 0.5rem;
    gap: 0;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition: opacity 200ms, transform 200ms;
  }

  .nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav a {
    padding: 0.7rem 0.75rem;
    border-radius: 0.375rem;
  }

  .nav a::after {
    display: none;
  }

  .nav a:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
  }

  .nav-toggle {
    display: flex;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}