:root{--bg:#f7f6f3;--surface:#fff;--border:#dcd9d2;--text:#1f1e1c;--muted:#6b6862;--accent:#2b5fab;--prefill-bg:#eeece6;--prefill-border:#a8a49b;--continuation-border:#2b5fab;--reasoning-bg:#f3f1fa;--reasoning-border:#8b84c4;--mono:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;line-height:1.45}*{box-sizing:border-box}body{margin:0}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--surface);border-radius:4px;padding:2px 8px}button:disabled{cursor:default;opacity:.4}button.link{color:var(--accent);background:0 0;border:none;padding:0}code,pre{font-family:var(--mono);font-size:12.5px}.muted{color:var(--muted)}.small{font-size:12px}.app{flex-direction:column;height:100vh;display:flex}.topbar{background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:20px;padding:8px 16px;display:flex}.topbar 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