:root{--bg: #f7f7f8;--panel: #ffffff;--border: #e5e5e8;--text: #1f2328;--muted: #6b7280;--accent: #10a37f;--accent-hover: #0e8c6c;--user-bubble: #10a37f;--user-text: #ffffff;--assistant-bubble: #f4f4f5;--error: #b91c1c;--radius: 12px;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;height:100vh;max-width:900px;margin:0 auto}.app--wide{max-width:1200px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid 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