/* theme.css — Know Longer's visual system. * * Eight color schemes, switched by data-theme on (set pre-paint by * theme.js, chosen at /settings.html, saved per-browser). * * Design rules this file enforces: * - Text is never gradient-filled and almost always neutral; color is * reserved for interaction, structure, and small functional accents. * - Gradients appear only in the page background (very light), the top * spine, and primary buttons (two close stops, toned down). * - Typeface is Geist throughout — clean tech-startup register. * * Every page's own stylesheet uses ONLY these variables for color. * Loaded AFTER each page's inline