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(width<=980px){:root{--sidebar-w:260px}.brand-right{flex:auto}.user-chip{max-width:none}.system-grid,.section-grid,.calc-form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.calc-project-tools{grid-template-columns:1fr}.calc-project-actions{justify-content:flex-start}.system-cell:nth-child(2),.section-card:nth-child(2){border-right:0}}@media (width<=760px){.app-layout{grid-template:"rail"3px"header""sidebar""main"minmax(0,1fr)"footer"/1fr}.app-rail{background:var(--accent)}.app-rail:after{display:none}.brand-header,.brand-right{flex-wrap:wrap}.brand-block{border-right:0;border-bottom:1px solid var(--border);width:100%;min-width:0;min-height:64px}.brand-right{width:100%}.user-chip{border-left:0;flex:190px}.app-sidebar{border-right:0;border-bottom:2px solid var(--accent)}.menu-list{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.menu-leaf{padding-left:18px}.menu-leaf.active{padding-left:12px}.welcome,.content-view{padding:28px 18px}.welcome h1{font-size:34px}.system-grid,.section-grid,.calc-form-grid{grid-template-columns:1fr}.system-cell,.section-card{border-right:0;border-bottom:1px solid var(--border)}.system-cell:last-child,.section-card:last-child{border-bottom:0}.panel-header,.project-row,.calc-project-row,.app-footer{flex-direction:column;align-items:flex-start}.footer-legal{text-align:left;margin-left:0}}@media (width<=480px){.menu-list{grid-template-columns:1fr}.theme-toggle,.logout-btn{flex:50%}.auth-card,.public-card{padding:22px}}