olemd/forskjeller.naiv.no

Ole-Morten Duesund 44c8fe26bf Initial commit: forskjeller.naiv.no

Interactive salary gap calculator (public/lonn/) showing how
percentage-based raises amplify absolute salary differences over time.
Includes landing page, README, and CLAUDE.md.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-13 13:09:04 +01:00

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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Interactive web application that visualizes how percentage-based salary increases amplify absolute salary differences over time. Norwegian-language UI ("Lønnsforskjellen vokser" = "The salary gap grows").

Architecture

Hosted at forskjeller.naiv.no. Static site in public/ — no build system, no package manager. Serve public/ as the site root. Each topic gets its own subdirectory (e.g. public/lonn/).

public/lonn/index.html — Page structure: header, 4 range-slider controls, 4 stat cards, 4 chart canvases, explainer section
public/lonn/style.css — CSS custom properties in :root, CSS Grid layouts, responsive breakpoints at 560px/480px/360px
public/lonn/app.js — All logic:
- fmtKr(n) / fmtShort(n) — Norwegian locale number formatting (nb-NO)
- getData() — Computes compound growth arrays from slider values
- baseOpts() — Shared Chart.js config factory for all 4 charts
- update() — Reads sliders, recalculates, updates DOM and charts (called on every input event)

External dependencies (loaded via CDN, no install needed): Chart.js 4.4.1, Google Fonts (Fraunces + DM Sans).

Key Design Decisions

All 4 charts share baseOpts() — modify this for consistent chart styling changes
Charts update with 'none' animation mode for responsive slider interaction
Mathematical model: gap = (B₀ − A₀) × (1 + r)ⁿ

Development

python3 -m http.server 8000 -d public
# open http://localhost:8000/lonn/

Language

All user-facing text is in Norwegian Bokmål (nb-NO). Use Norwegian for UI strings and nb-NO locale for number formatting.

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