Problem Solving & Design B

The app cleanly solves the brief with a per-room humidity scale, proportional summary bar, and zone classification that matches the spec thresholds exactly.

• +The proportional summary bar uses flex-grow set to the room count per zone, so the bar segments resize automatically as rooms are added or removed.
• +Each room card shows a visual 0–100 scale with the ideal band marked and a dot positioned at the exact humidity reading.
• +localStorage entries are re-validated through the same validator used for fresh input, preventing hand-edited values from bypassing the 0–100 constraint.

Completeness B+

All seven brief features are fully implemented, including add, badge classification, summary bar, inline edit, delete, and localStorage persistence.

• +The two-step delete flow prevents accidental removal by requiring a confirmation click before the room is removed.
• +The empty state is rendered deliberately when no rooms exist, giving new users a clear prompt.
• -Validation errors from the inline editor (edit save path) are shown only inside the card's local error paragraph and are never announced to assistive technology — there is no aria-live region on that element.

Technical Craft C

Logic is cleanly separated into a pure zone.js module with automated tests, named functions throughout, and motion respecting prefers-reduced-motion, though types rely solely on JSDoc rather than declared interfaces.

• +The prefers-reduced-motion media query is checked before applying the flash animation, and a CSS rule collapses all transition durations for users who prefer reduced motion.
• +The zone classification module throws a TypeError on non-finite input rather than silently falling through to a wrong zone.
• +Automated tests cover zone boundaries, validation edge cases, normalisation, and summarisation and can be run with a single node command.
• -Types are documented only via JSDoc comments rather than declared interfaces or type aliases that a type checker can enforce; the typedef declarations in zone.js are comments, not enforced definitions.
• -The README has an unresolved git merge conflict marker left in the file, which would confuse anyone reading the documentation.