@media (max-width:768px){.header-nav{display:none}.header-auth-buttons{display:none}.mobile-menu-toggle{display:flex}.header-actions{gap:0.5rem}.builder-layout{grid-template-columns:1fr}.schematic-column{position:relative;top:0}.part-row{grid-template-columns:1fr;gap:0.75rem}.part-row__actions{justify-content:flex-start}.parts-list__actions{flex-direction:column}.footer-bottom-content{gap:1.5rem}.footer-legal{flex-wrap:wrap;justify-content:center}.parts-list__title-left{flex:1;min-width:0}.parts-list__title-right{flex-shrink:0}.parts-list__meta-divider{display:none}.parts-list__author,.parts-list__date{font-size:0.75rem}.btn-text-desktop{display:none}.toast{bottom:16px;right:16px;left:16px;text-align:center}}@media (max-width:480px){.header-container{height:56px}.header-action-btn{width:36px;height:36px}.hero-cta{flex-direction:column;align-items:center}.hero-cta .btn{width:100%}}