Feature Adoption Tracker.

Build a feature adoption tracker for the product team at Brightquill, a fictional B2B proposal software company with customers on Starter, Pro, and Enterprise plans and in three size bands (1 to 50, 51 to 500, and over 500 employees). Layout: the centerpiece is an adoption matrix, one row per feature, sorted by weekly adoption descending. Fixed columns: feature name with launch timing beneath it (like launched 9 weeks ago), percent of accounts that ever tried it, percent using it weekly, and a trend badge (up, flat, or down, computed from change over the last 4 weeks). After those, one column per segment showing weekly adoption percent as a cell whose background intensity scales with the value, so the matrix reads like a heat map. A toggle above the matrix switches the segment columns between By plan (Starter, Pro, Enterprise) and By customer size (the three bands). A slim strip above everything shows: features tracked (18), median weekly adoption (about 24 percent), best performer (Smart Summaries at 71 percent), launches last quarter (5). Clicking a row opens a side panel: the feature description, launch timing, its two big percentages, the trend badge, and a horizontal bar chart of weekly adoption across all six segments so plan and size can be compared at once. A member only Add feature button opens a dialog capturing name, a one line description, category, and launch date; freshly added features render in a too-new-to-trend state. The page must read perfectly for visitors who never write. Data to seed: 18 features with plausible names for proposal software (Smart Summaries, Template Library, E-sign Reminders, Pricing Tables, Custom Webhooks, Slide Mode, Approval Chains, CRM Sync, and similar), each with a category, description, and a launch between 2 and 26 weeks ago, exactly five of them inside the last quarter; plus one adoption record per feature per segment (six segments) holding tried percent, weekly percent, and 4 week change. Plant this story: Smart Summaries is the flagship, above 65 percent weekly in every segment; Custom Webhooks and Slide Mode clearly flopped, under 5 percent tried a full quarter after launch; and Enterprise adopts workflow features at roughly triple the Starter rate, visible as a dark right edge on those rows. Behavior: everything in the matrix and strip computes from the adoption records. Trend badges: green up, gray flat, red down. Visual identity: an indigo accent on a cool white base, with heat map cells running a light to deep indigo ramp and indigo active states throughout.