(function () {
  var allowed = { light: true, dark: true, system: true };
  var cookieMatch = document.cookie.match(/(?:^|; )hpc-theme=([^;]+)/);
  var cookieValue = cookieMatch ? decodeURIComponent(cookieMatch[1]) : null;
  var stored = null;
  try { stored = localStorage.getItem("hpc.theme.preference"); } catch (_) {}
  var preference = allowed[cookieValue] ? cookieValue : (allowed[stored] ? stored : "system");
  var dark = window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches;
  var resolved = preference === "system" ? (dark ? "dark" : "light") : preference;
  var root = document.documentElement;
  root.dataset.themePreference = preference;
  root.dataset.theme = resolved;
  root.style.colorScheme = resolved;
})();