Problem Solving & Design 72

The UI is clean and purposeful with a consistent dark-border card system, but the color bar legend duplicates 'Too low' and 'Too high' with identical pink swatches, which could confuse users trying to distinguish zones.

• +The bar visually encodes three pressure zones with distinct background colors and places front/rear markers directly on the track, giving spatial context to the recommended range.
• +Wheel-specific tips are differentiated by position (front vs rear) rather than being generic, giving actionable advice tied to the actual wheel.
• -The bar legend shows two identical pink 'Too low' and 'Too high' swatches with no visual distinction between them, so users cannot tell which end of the bar each legend entry refers to.
• -The bar markers for front and rear are positioned at the start and midpoint of the ideal zone by default rather than reflecting actual user-entered pressures, which is misleading before the check inputs are filled.

Completeness 51

All logic lives in a single self-contained HTML file structured as one large IIFE, with multiple distinct placeholder messages for error states, missing inputs, invalid weight, and no-data conditions.

• +The app immediately shows a placeholder message when inputs are incomplete, giving users clear guidance before any results appear.
• +Weight validation covers both unit systems with specific range messages, and the error is surfaced inline near the input via a live region.
• +Previous front/rear check values are preserved across re-renders so users don't lose their typed pressure when switching bike type or weight.
• -All logic lives in a single IIFE with no module boundaries or named exported functions, making it hard to test or extend individual pieces like findBracket or classifyPressure in isolation.
• -There are no loading states — the Google Fonts request is a network dependency with no fallback indication if it fails, and the UI has no skeleton or spinner pattern for any async path.

Technical Craft 28

The implementation is clean vanilla JS with good DOM hygiene and an esc() sanitizer, but the entire app is one monolithic IIFE with no type annotations, no tests, and render logic mixed with event wiring.

• +User-supplied strings passed into innerHTML are sanitized through a dedicated esc() function that uses textContent assignment to prevent injection.
• +The unit toggle converts the existing input value to the new unit before switching, preserving the user's weight rather than clearing the field.
• -There are no automated tests of any kind; pure functions like classifyPressure, findBracket, and toKg are testable in isolation but are never exercised outside the browser.
• -The render() function both computes state and mutates the DOM, and also wires new event listeners on every call, meaning frontCurrent and rearCurrent accumulate duplicate listeners each time render() runs.
• -No explicit type definitions or JSDoc annotations exist anywhere; parameter types for functions like findBracket(type, weightKg) and classifyPressure(psi, range) are implicit and undocumented.