/* Shared breakpoints: navigation changes when its content no longer fits. */
@media (max-width: 1280px) {
  .navbar { padding: 0 1rem; gap: .5rem; }
  .hamburger { display: inline-grid; place-items: center; width: var(--touch-target); min-width: var(--touch-target); padding: 0; }
  .nav-actions { margin-left: auto; gap: .35rem; }
  .nav-backdrop { position: fixed; inset: 0; z-index: 999; border: 0; padding: 0; background: rgba(4, 8, 18, .62); opacity: 0; pointer-events: none; transition: opacity var(--transition-fast); }
  .nav-backdrop.open { opacity: 1; pointer-events: auto; }
  .nav-links { display: flex; flex-direction: column; align-items: stretch; gap: .5rem; position: fixed; top: 0; left: 0; z-index: 1001; width: min(84vw, 320px); height: 100dvh; max-height: none; overflow-y: auto; overscroll-behavior: contain; padding: 1rem; background: var(--bg-primary); border-right: 1px solid var(--border-subtle); border-bottom: 0; box-shadow: 1.5rem 0 3rem rgba(0, 0, 0, .2); transform: translateX(-105%); visibility: hidden; transition: transform var(--transition-normal), visibility var(--transition-normal); }
  .nav-links.open { transform: translateX(0); visibility: visible; }
  .nav-links > li { display: block; width: 100%; flex: 0 0 auto; }
  .mobile-nav-header { display: flex !important; align-items: center; justify-content: space-between; min-height: var(--nav-h); margin: -1rem -1rem .5rem; padding: 0 1rem; border-bottom: 1px solid var(--border-subtle); }
  .mobile-nav-title { color: var(--text-primary); font-weight: 800; font-size: 1.1rem; letter-spacing: .12em; }
  .mobile-nav-close { display: grid; place-items: center; width: 48px; height: 48px; padding: 0; border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); background: var(--bg-card); color: var(--text-primary); font-size: 1.7rem; line-height: 1; cursor: pointer; }
  .mobile-nav-close:hover, .mobile-nav-close:focus-visible { border-color: var(--border-accent); background: var(--bg-card-elevated); }
  .nav-link { display: flex; align-items: center; width: 100%; min-height: 52px; padding: .7rem .85rem; }
  .nav-secondary { display: block; }
}
@media (max-width: 1080px) {
  .model-layout { grid-template-columns: minmax(0, 1fr); }
  .model-sidebar { position: static; max-height: none; order: -1; display: none; }
  .model-sidebar.open { display: block; }
  .model-sidebar-toggle { display: inline-flex; }
}
@media (max-width: 900px) {
  .model-hero { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .nav-controls { grid-template-columns: 1fr 1fr; }
  .nav-center { grid-column: 1 / -1; order: -1; }
}
@media (max-width: 600px) {
  .container { padding: 1.5rem 1rem 3rem; }
  .navbar { padding-inline: .5rem; gap: .25rem; }
  .nav-brand { font-size: 1rem; gap: .35rem; flex-shrink: 0; }
  .nav-actions { gap: .125rem; }
  .nav-actions .icon-btn { padding: .35rem; }
  .control-label, .creator-link-label { display: none; }
  .control-icon { display: inline-block; font-size: 1.25rem; line-height: 1; }
  .model-title { font-size: clamp(1.75rem, 7vw, 2.5rem); line-height: 1.15; }
  .section-title { font-size: 1.4rem; }
  .stat-grid, .toc, .nav-controls { grid-template-columns: minmax(0, 1fr); }
  .nav-center { order: 0; }
  .visual-caption { grid-template-columns: minmax(0, 1fr); gap: .25rem; }
  .static-chart { min-height: 0; }
  .flow-step { flex-wrap: wrap; }
  .progress-actions { flex-wrap: wrap; }
  .search-box { width: 100%; padding: 1rem; }
  .search-result-item { padding: .75rem .25rem; gap: .5rem; }
  .search-hint { font-size: .875rem; }
  .home-hero h1 { font-size: clamp(2.2rem, 10vw, 3.5rem); line-height: 1.04; }
  .home-hero .hero-demo { display: none; }
  .home-hero { padding: 1.5rem 0; }
  .hero-actions { display: grid; }
  .hero-actions .btn { justify-content: center; }
  .step-options { grid-template-columns: minmax(0, 1fr); }
  .card-body, .app-dl dd, .term-card p, .path-card p { font-size: 1rem; line-height: 1.7; }
  .filter-chips .chip, .phase-links a, .sidebar-list a { min-height: var(--touch-target); display: inline-flex; align-items: center; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}