Now: money() turns any amount under $0.005 into 0 before it formats, so the coin table's Price cell for Ravencoin (CoinGecko price $0.00139) shows "$0.00000", even though the cell asks for 5 decimals (App.tsx:181).

Change to: make the zero cutoff follow the decimals requested: Math.abs(n) < 0.5 * 10 ** -digits ? 0 : n. The cell then reads "$0.00139", and 2-decimal amounts still round to zero below half a cent.

Why: the brief asks for a coin comparison table. A zero price on a ranked row is wrong data, and it undermines trust in the ranking.

Now: the How-it-works heading is "A little claritybehind the numbers." (App.tsx:185). Under 580px this rule hides the , and there is no space next to it, so the heading shows "A little claritybehind" / "the numbers.".

Change to: delete the in App.tsx:185 and this rule, and rename the heading to suit a tool page: "How the numbers are calculated". It then wraps naturally at every width.

Why: two words run together in the main help section read as a typo. On a tool, headings name the task in plain words, with no voice line.

Now: inputs edit a draft. The result, ROI, break-even and the coin table all use rig, which only changes when "Calculate profitability" is pressed (App.tsx:120-128). Until then the coin table's buttons are disabled and a note says "Settings changed. Calculate to update." At 390x844 the net profit figure starts at y=1083, below the first screen, so a visitor who types a new electricity cost sees no number change.

Change to: recalculate from the draft whenever it is valid (if (validRig(next)) setRig(next) in the update handlers). Keep the Calculate button as the explicit save-and-scroll action on phones. Delete the subtitle "Mining profitability, with your real-world costs." (App.tsx:139), which repeats the h1, so the form moves up about 50px.

Why: the brief says "get real-time ROI, break-even" and "Calculate your exact mining profitability in seconds".

Now: HARDWARE holds the Antminer S21 Pro and the RTX 4090 plus two "Custom" entries. The "Hardware model" select (App.tsx:145) therefore offers one real choice for ASIC and one for GPU, and anyone with another miner has to type hashrate and watts by hand.

Change to: add the common current models to HARDWARE, with their hashrate.no reference figures as per-model benchmarks (for example Antminer S21, S19 XP and Whatsminer M60S for SHA-256; RTX 3080, RTX 3070 and RX 6800 XT for GPU, with hashrate and watts per algorithm). Make chooseHardware (App.tsx:116) load the chosen model's benchmarks instead of always defaultRig(mode).

Why: the brief says "input hardware model", and a picker with one entry is not a choice of model. The figures can be written into the repository from hashrate.no's public pages, with no API key needed.

Now: the page ends with "Better inputs make better estimates. Measure your rig at the wall and use your actual electricity rate." The footer adds "A clearer view of mining." and "Built for miners. Runs in your browser." (App.tsx:195).

Change to: move the useful instruction next to the control it explains, as a hint on #power: "Measure at the wall, including PSU and fan overhead." Delete the closing-note div so the footer moves up, and delete the footer tagline "A clearer view of mining.". Keep "Runs in your browser.".

Why: people read a tool to get a task done. Headings name the task, there is no voice line, and directions sit next to the control they explain.

Now: SVG text is sized in viewBox units (12px here, var(--text-lg) under 580px at styles.css:337), so it scales with the chart width. The axis labels and "Hardware $3,000" render in a 21px box at 1440 and a 16px box at 390, while the heading "The road to break-even" is 14px. The hardware label also sits on the top grid line.

Change to: give the chart text a fixed rendered size (render the labels as HTML outside the SVG, or set the viewBox width to the rendered width) so the labels match the site's 12px, and move the hardware label below its dashed line (y = threshold + 16).

Why: a heading should outrank its labels, and the page should use one type scale.