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720px){.topbar{flex-wrap:wrap;gap:6px;padding:8px 10px}.topbar .controls{flex-wrap:wrap;gap:5px}.drawer{width:100vw;max-width:100vw}.plan-assignments .pa-strip{overflow-x:auto}.room-grid{grid-template-columns:1fr}.workbench{margin-top:14px}.seg{flex-wrap:wrap}.exercise svg{max-width:100%;height:auto}.chap-nav,.chap-nav-foot{grid-template-columns:1fr;gap:8px}}@media (max-width: 480px){.plan-header{flex-direction:column;align-items:flex-start;gap:8px}.room-title-row{flex-wrap:wrap}.iconbtn{width:30px;height:30px}}