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var(--gutter));padding:10px var(--gutter) calc(10px + env(safe-area-inset-bottom));align-items:flex-end;gap:8px;margin:0 auto;display:flex}.composer textarea{resize:none;border:1px solid var(--border);background:var(--surface);border-radius:12px;flex:1;min-width:0;min-height:44px;max-height:200px;padding:10px 12px;line-height:1.4}.composer button{min-height:44px}.only-mobile{display:none}@media (max-width:860px){.chat-layout{grid-template-columns:minmax(0,1fr)}.chat-layout.show-main .chat-sidebar,.chat-layout.show-list .chat-main{display:none}.chat-sidebar{padding:16px var(--gutter);border-right:none}.only-mobile{display:inline-flex}.msg.user .bubble{max-width:92%}.artifact-frame{height:55vh}.detail-grid{grid-template-columns:minmax(0,1fr)}.preview-frame{height:60vh;min-height:300px}}@media (max-width:640px){:root{--gutter:16px}body{font-size:16px}.topbar{flex-wrap:wrap;gap:4px 12px;padding-top:6px;padding-bottom:6px}.tabs{order:3;width:100%}.tabs a{flex:1;justify-content:center}.content{padding-top:16px}.content.content-chat{padding:0}.cards{grid-template-columns:minmax(0,1fr)}.user-name{max-width:14ch}.preview-bar>:first-child{width:100%}.preview-bar button,.preview-bar .button{flex:1}.row{flex-direction:column}}