:root{--fb-accent:#4f46e5;--fb-bg:#fff;--fb-surface:#f8fafc;--fb-border:#e2e8f0;--fb-text:#0f172a;--fb-muted:#64748b;--fb-subtle:#94a3b8;--fb-radius:10px}@media (prefers-color-scheme:dark){:root{--fb-bg:#0f172a;--fb-surface:#1e293b;--fb-border:#334155;--fb-text:#f1f5f9;--fb-muted:#94a3b8;--fb-subtle:#64748b}}*{box-sizing:border-box}body{color:var(--fb-text);background:var(--fb-bg);-webkit-font-smoothing:antialiased;margin:0;font:14px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{font:inherit;cursor:pointer}input,textarea{font:inherit;color:inherit;border:1px solid var(--fb-border);background:var(--fb-bg);border-radius:8px;width:100%;padding:8px 10px}input:focus,textarea:focus{border-color:var(--fb-accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--fb-accent) 18%, transparent);outline:none}.fb-app{max-width:780px;margin:0 auto;padding:14px}.fb-tabs{border-bottom:1px solid 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