Profit margin calculator

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Build a profit margin calculator as a standalone lead-generation tool for Marlow Advisory, a small-business bookkeeping and advisory firm — this is a utility-led, interactive tool meant to be linked from ads or embedded on the firm's site, so the calculator needs to be usable in five seconds, with no signup wall before a visitor sees their number. Skip a photo hero entirely: open straight into the tool on a calm, confident ground, with a short headline above the inputs reading 'Know your real margin, not your gut feeling' and a one-line subhead: 'Enter your numbers, see your gross and net margin instantly.' Pair Söhne (or a similar geometric sans) for headlines and result figures with Inter for input labels and body copy, with all numeric output in tabular figures so digits don't shift the layout as they update. Ground the interface in cool slate-tinted neutral (#F4F5F7), deep ink for text and static UI (#1E2430), and a single warm amber accent (#D98E33) used only on the calculate button, the margin gauge needle, and the healthy range band. Build the calculator with three inputs (Revenue, Cost of goods sold, Operating expenses) as large labeled number fields with real dollar formatting, and a 'Calculate my margin' button. On calculation, reveal a results panel built around a semi-circular gauge — not a plain number — with a needle that sweeps to the calculated gross margin percentage, a shaded band on the gauge marking the healthy range for a small business (roughly 20–40%), and beneath it the exact gross margin and net margin figures spelled out with a one-sentence plain-language read ('Your gross margin is 34% — solidly healthy for a service business'). Below the calculator, add a short section offering a free 30-minute margin review call with a real CTA, positioned as a next step, not a gate. The signature moment: the gauge needle sweeps into position over 700ms with a slight overshoot-and-settle easing (like a real analog gauge, not a linear tween), and the healthy-range band fades in a beat before the needle moves, so the visitor sees the target before they see where they land — a small sequencing choice that turns a static result into something that feels like it's being measured, not just calculated. Animate the results panel with a 250ms fade-up on reveal, the gauge sweep as described above, and the healthy-range band with a 200ms fade-in preceding it; collapse the sweep to an instant final needle position and the band to an instant static state under prefers-reduced-motion. No placeholder numbers, firm details, or 'Company Name' — every figure, label, and CTA should read as real.

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