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(max-width:960px){.mainHeader{position:static;top:auto}.publishBar{grid-template-columns:1fr}.publishActions{justify-content:stretch}.publishActions>*{flex:100%}.publishMeta{grid-template-columns:1fr 1fr}html,body{min-height:100dvh}.shell{grid-template-columns:1fr;grid-template-areas:"main""sidebar"}.sidebar{border-right:0;border-bottom:1px solid var(--line);padding-top:12px}.main{padding:12px}.chat{min-height:100dvh}.composer{z-index:5;border-top:1px solid var(--line);padding:12px;padding-bottom:calc(12px + env(safe-area-inset-bottom,0px));background:linear-gradient(#0b0d12eb,#0b0d12fa);margin:0 -6px -6px;position:sticky;bottom:0}textarea{min-height:108px;max-height:min(36dvh,280px)}.actions button{flex:1 1 0;min-height:48px}}@media (max-width:1280px){.publishBar{grid-template-columns:1fr}.publishActions{justify-content:flex-start}.publishMeta{grid-template-columns:1fr 1fr}}.themeSwitch{letter-spacing:.08em;text-transform:uppercase;border-radius:999px;width:auto;min-height:42px;padding:10px 14px;font-size:12px}[data-theme=light] input,[data-theme=light] textarea,[data-theme=light] select{color:var(--text);border-color:var(--line);background:#fff}[data-theme=light] .message.user{color:#fff;background:#2563eb}[data-theme=light] .heroAction{background:#fff}