/* ============================================================================ RHCES Unified Theme — StrucTools skin + light/dark toggle ---------------------------------------------------------------------------- Default theme : "light" → StrucTools look (navy #1B3A5C + gold #D4A017) Alternate : "dark" → original calculator look (cyan/gold on near-black) HOW IT WORKS The calculator template family reads every colour from CSS custom properties (--bg-0, --cyan, --gold, --text ...). Re-declaring those variables under :root[data-theme="..."] out-specifies each page's own :root{} block, so the entire page re-skins with zero markup changes. Shared variable names (--text, --muted, --border) resolve correctly for BOTH page families because "light mode → dark text / light borders" is the right answer for every page. Loaded after each page's inline