first commit

src/web/css/30-responsive.css

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+@media(max-width:850px){.body{grid-template-columns:58px minmax(0,1fr)}.sidebar{padding:8px}.nav button{justify-content:center;padding:0}.nav button span,.nav-section,.sidebar-foot,.brand span,.search{display:none}.topbar{grid-template-columns:40px 1fr}.who strong{max-width:120px}.cards{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:1fr 1fr}}@media(max-width:560px){.content{padding:12px}.cards{grid-template-columns:1fr 1fr}.page-head{display:block}.page-head .actions{margin-top:10px}.modal-body{grid-template-columns:1fr}.modal-body .wide{grid-column:auto}.who{display:none}.feature-grid{grid-template-columns:1fr}}
+@media(max-width:860px){.two-col{grid-template-columns:1fr}}