*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#fafafa;color:#1a1a1a}button{cursor:pointer}button,input,select,textarea{font-family:inherit}@keyframes spin{to{transform:rotate(1turn)}}.app-shell{display:flex;flex-direction:column;height:100vh;overflow:hidden;background:#f5f5f5}.app-mobile-tabs{display:none}.app-panels{flex:1 1;display:flex;overflow:hidden;min-height:0}.app-tab-strip{display:flex;border-bottom:1px solid #e5e5e5;overflow-x:auto;flex-shrink:0;-webkit-overflow-scrolling:touch;scrollbar-width:thin}.app-tab-strip::-webkit-scrollbar{height:4px}.app-tab-strip::-webkit-scrollbar-thumb{background:#ddd;border-radius:2px}@media (max-width:768px){.app-mobile-tabs{display:flex;background:#fff;border-bottom:1px solid #e5e5e5;flex-shrink:0;position:-webkit-sticky;position:sticky;top:0;z-index:10}.app-mobile-tabs button{flex:1 1;padding:13px 0;font-size:14px;font-weight:600;background:none;color:#666;border:none;border-bottom:2px solid transparent;transition:color .15s,border-color .15s}.app-mobile-tabs button.active{color:#b8860b;border-bottom-color:#b8860b}.app-panel-form,.app-panel-preview{width:100%!important;border-left:none!important;border-right:none!important;flex:1 1 100%!important}.app-panel-form.hidden,.app-panel-preview.hidden{display:none!important}}