:root{--red:#d93a34;--red-dark:#b92f29;--bg:#0f1113;--bg-panel:#16181c;--bg-elev:#1e2126;--bg-input:#232830;--border:#2a2f37;--text:#e8eaed;--text-dim:#9aa0aa;--user-bubble:#2b3038;--font:"Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif}*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}button{cursor:pointer;font-family:inherit}input,textarea,select{font-family:inherit}.app{height:100vh;display:flex;overflow:hidden}.sidebar{background:var(--bg-panel);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:270px;display:flex}.sidebar-head{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:16px 14px 10px;display:flex}.sidebar-head 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