*{box-sizing:border-box}:root{color-scheme:dark;--bg:#0b0f17;--side:#0f141e;--panel:#151b27;--panel2:#1c2331;--line:rgba(255,255,255,.09);--text:#f4f6f8;--muted:#9aa4b5;--accent:#fff;--soft:#242c3b}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}.hidden{display:none!important}.app-shell{height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.sidebar{background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;padding:12px}.sidebar-head{display:flex;gap:8px}.new-chat{flex:1;border:1px solid var(--line);background:transparent;color:var(--text);border-radius:12px;padding:12px 14px;display:flex;align-items:center;gap:10px;font-weight:700;cursor:pointer;text-align:left}.new-chat:hover,.sidebar-action:hover,.conversation:hover{background:var(--panel)}.new-chat-icon{font-size:19px}.sidebar-close{display:none;border:0;background:transparent;color:var(--muted);font-size:24px}.sidebar-label{font-size:12px;color:var(--muted);padding:20px 10px 8px}.conversation-list{overflow:auto;flex:1}.conversation{display:flex;align-items:center;gap:8px;padding:10px;border-radius:10px;color:#d8dde7;cursor:pointer;font-size:14px}.conversation.active{background:var(--panel2)}.conversation span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation button{border:0;background:transparent;color:var(--muted);cursor:pointer}.sidebar-footer{border-top:1px solid var(--line);padding-top:10px;display:grid;gap:4px}.sidebar-action{display:flex;justify-content:space-between;border:0;background:transparent;color:var(--text);padding:10px;border-radius:10px;cursor:pointer}.sidebar-action span{color:var(--muted)}.main{height:100vh;min-width:0;display:flex;flex-direction:column}.topbar{height:58px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 18px;position:relative}.brand-title{font-weight:750;font-size:18px;margin:auto}.plain-icon{width:38px;height:38px;border:0;background:transparent;color:var(--text);font-size:21px;border-radius:10px;cursor:pointer}.plain-icon:hover{background:var(--panel)}#newChatMobile{visibility:hidden}.empty-state{margin:auto;width:min(760px,calc(100% - 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