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User, October 2026: add bright/dark mode to the site for both tools. - Each page sets data-theme on <html> before first paint: the saved choice (localStorage "cnx-theme", shared by all cnxvinyl.lol pages) or, without one, the system setting (prefers-color-scheme), which it keeps following until the user picks a mode. Toggle: header button (sun / moon). - Plant overview: light overrides for every SVG class; pipe colours are now CSS variables (--p-*), used by the pipes and the legend, darkened in light mode where the dark-mode tints were too pale (DI water, granulate, stamper sets, cooling return); press state text and the VEX zone fills use variables instead of inline hex, so they flip with the theme. - Fleet calculator and landing page: light palettes; input, flag, badge and ladder-highlight colours moved to variables. Checked headless in Edge: both system schemes pick the right mode, the toggle persists across pages, computed colours flip (press text, zones, pipes, legend), no text overflow in either mode, no JS errors.