Concept: an annotated field notebook, not an analytics dashboard. Research is a deliberate series of page observations. The narrow popup reads like a marginal note: a red spine, one action, then an editable record.
Palette: paper #f8f7f2, ink #26333a, signal red #b94a42, field blue #477887, quiet line #c9cfc8.
Type: Georgia for the product name and key section titles; Arial and system Chinese sans-serif for controls and small records.
Layout: masthead and three tabbed work surfaces. Capture is a single sequence, library is a compact ledger, brief is a plain editable text source. At mobile popup widths, the layout fills available width.
Differentiator: the red margin spine marks the page-to-insight transition. It does not use simulated “viral” analytics or fabricated content screenshots.
Known limits: Chrome extension popups are not full mobile apps. Selectors are best effort and need human correction after platform layout changes.