@media (max-width: 980px) {
  .hero-grid,
  .about-grid,
  .project-feature,
  .document-layout,
  .contact-grid,
  .hobby-section {
    grid-template-columns: 1fr;
  }

  .document-header {
    grid-template-columns: 1fr;
  }

  .hero-image {
    max-width: 560px;
    margin: 0 auto;
  }

  .split-heading,
  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 5px;
  }

  .timeline-year {
    padding-left: 1.6rem;
  }

  .timeline-year::after {
    left: 0;
    right: auto;
  }

  .travel-gallery-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .project-flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }
}

@media (max-width: 720px) {
  .section-space {
    padding: 3.7rem 0;
  }

  .container {
    width: min(calc(100% - 1.5rem), var(--max-width));
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.6rem);
    left: 1rem;
    right: 1rem;
    display: none;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    background: var(--surface-strong);
    box-shadow: var(--shadow-soft);
  }

  body.nav-open .site-nav {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a {
    width: 100%;
    justify-content: center;
  }

  .hero h1,
  .page-intro h1 {
    font-size: clamp(2.2rem, 10vw, 3rem);
  }

  .meta-grid,
  .form-row {
    grid-template-columns: 1fr;
  }

  .travel-gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-item {
    gap: 0.7rem;
  }

  .gallery-tile.landscape {
    grid-column: span 2;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    justify-content: flex-start;
    margin-left: 0;
  }

  .modal-card {
    padding: 1.5rem;
  }

  .hobby-section {
    padding: 1rem;
  }

  .hobby-section-reverse .hobby-image,
  .hobby-section-reverse .hobby-copy {
    order: initial;
  }
}