html,body{height:100%;margin:0}body{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#fff;color:#1f2937}.app-shell{height:100vh;display:flex}.sidebar{width:280px;flex:0 0 280px;border-right:1px solid #e5e7eb;padding:18px;display:flex;flex-direction:column;background:#f8fafc}.brand{font-size:1.15rem;font-weight:800;letter-spacing:-.02em;margin-bottom:18px}.conversation-list{overflow-y:auto;flex:1}.conversation-item{width:100%;border:0;background:transparent;text-align:left;border-radius:10px;padding:10px 12px;margin-bottom:3px;cursor:pointer}.conversation-item:hover,.conversation-item.active{background:#e9eef5}.conversation-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-bottom{border-top:1px solid #e5e7eb;padding-top:15px;margin-top:15px}.main-panel{min-width:0;flex:1;display:flex;flex-direction:column}.topbar{min-height:64px;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;gap:12px;padding:10px 22px}.model-select{width:190px}.messages-area{flex:1;overflow-y:auto;padding:30px max(20px,calc((100% - 900px)/2))}.empty-state{max-width:700px;margin:18vh auto 0;text-align:center}.empty-state h1{font-size:clamp(2rem,5vw,3rem);font-weight:750}.message{max-width:850px;margin:0 auto 24px}.message-user{background:#f3f4f6;border-radius:18px;padding:13px 16px;margin-left:auto;width:fit-content;max-width:82%}.message-assistant{padding:4px 2px}.message-role{font-size:.78rem;font-weight:700;color:#6b7280;margin-bottom:5px}.message-content{line-height:1.65;overflow-wrap:anywhere}.message-content pre{background:#111827;color:#f9fafb;padding:14px;border-radius:10px;overflow-x:auto}.message-content code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.inline-code{background:#f1f5f9;border-radius:5px;padding:2px 5px}.composer-wrap{padding:12px 20px 18px}.composer{max-width:900px;margin:0 auto;border:1px solid #cfd5dd;border-radius:16px;padding:8px;display:flex;gap:8px;background:#fff}.composer textarea{resize:none;border:0;outline:0;box-shadow:none!important;flex:1;padding:9px 10px;max-height:180px}.send-btn{align-self:flex-end}.auth-view{min-height:100vh;display:grid;place-items:center;padding:20px;background:#f8fafc}.auth-card{width:min(100%,420px);background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:30px;box-shadow:0 12px 35px rgba(0,0,0,.06)}@media(max-width:991.98px){.sidebar{position:fixed;inset:0 auto 0 0;z-index:20;transform:translateX(-100%);transition:transform .2s ease}.sidebar.open{transform:translateX(0)}.model-select{width:150px}.message-user{max-width:92%}}