Build a mobile friendly metals research tool inspired by Metals Observatory.
Use separate views for prices, charts, bullion and jewelry calculations, dealer comparisons, research and a Global Atlas.
Keep the main actions visible and put lengthy source notes in expandable sections.
Write short explanations with space between sentences.

Start with a small set of verified public sources and record each source URL, observation date, currency, unit and update time.
Distinguish spot quotes, retail asking prices, buyback offers and historical observations.
Mark stale prices clearly.
If live data is unavailable, show the last dated observation or an empty state rather than inventing a current price.
Keep missing values separate from zero.

Provide transparent calculators for metal weight, fineness, melt value and dealer premiums.
Show currency and troy ounce conversions and let users inspect the assumptions.
Build accessible charts and tables from the same data.
For the atlas, distinguish reserves, resources, production, holdings and trade data.
Do not place unlike measures in one ranking or present reporting gaps as zero.
Attach sources, years and definitions to country records.

Separate official statistics and source observations from economic interpretation and project inspiration.
Preserve any supplied inspiration credit without implying endorsement or copying another product's identity.
Do not turn commentary into a verified financial claim.

Keep personal calculations on the device and provide export and restore files.
Create an offline package containing the interface, calculators and permitted dated datasets.
Show that offline charts use saved observations and that fresh prices, embedded media and external links require a connection.
Check source terms before bundling third party data or media.
Do not include credentials or private account details.

Test conversion formulas, missing data, narrow screens, keyboard navigation and offline loading.
Deliver a working first version with a source list and refresh instructions.
To adapt the framework, replace metals with another measurable topic while retaining units, dates, provenance and transparent calculations.