(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;
})();