/* ============================================================ PHOENIX ONLINE EDUCATION — Site-wide Dark Mode ──────────────────────────────────────────────────────────── Activated by , set/removed by the toggle button + script living in includes/header.php. Loaded ONCE from header.php, so it automatically applies to every page that includes the header (which is every page). COVERAGE IN THIS PASS: - Site-wide CSS variable overrides (--navy, --slate, --gray, --primary, --secondary, --bg-light, --white, --c, --cd, --cdd) These override the SAME variable names each page defines in its own