@media (max-width: 860px){
  .pcb-stage{ grid-template-columns: 1fr; }
}

@media (max-width: 720px){
  #nav-rail{
    top:auto; bottom:0; left:0; right:0;
    flex-direction:row; border-left:none; border-top:1px solid var(--blueprint-line);
    overflow-x:auto;
  }
  #nav-rail a{
    writing-mode: horizontal-tb;
    padding: 12px 14px;
    border-bottom:none; border-right:1px solid var(--blueprint-line);
    white-space:nowrap;
  }
  .workspace{ padding: 60px 18px 70px; }
  h1{ font-size: clamp(30px, 9vw, 44px); }
  .pegboard{ grid-template-columns: repeat(auto-fill, minmax(130px,1fr)); }
  .notebook-stack{ min-height: 460px; }
}