// #127: dark mode toggle: flips to the other variant of the active pair.
// #127: dark mode toggle - flips to the other variant of the active pair.
  (function () {
    var PAIRS = {
      'midnight':        { light: 'midnight-light',       dark: 'midnight' },
      'smooth':          { light: 'smooth',               dark: 'smooth-dark' },
      'pastel-lavender': { light: 'pastel-lavender',      dark: 'pastel-lavender-dark' },
      'pastel-peach':    { light: 'pastel-peach',         dark: 'pastel-peach-dark' },
      'pastel-cloud':    { light: 'pastel-cloud',         dark: 'pastel-cloud-dark' }
    };
    var root = document.documentElement;
    function state() {
      var p = root.dataset.preset || 'midnight';
      for (var base in PAIRS) {
        if (p === PAIRS[base].dark) return { base: base, dark: true };
        if (p === PAIRS[base].light) return { base: base, dark: false };
      }
      return { base: 'midnight', dark: true };
    }
    function apply() {
      var s = state();
      document.body.classList.toggle('dark', s.dark);
      root.classList.toggle('dark', s.dark);
    }
    function sync(btns) {
      btns.forEach(function (b) {
        b.setAttribute('aria-pressed', state().dark ? 'true' : 'false');
      });
    }
    var btns = document.querySelectorAll('.dark-toggle');
    apply();
    sync(Array.prototype.slice.call(btns));
    btns.forEach(function (b) {
      // mark as wired so settings.js does not add a second handler
      // (#197: double-binding made the settings toggle flip twice = no-op)
      b.dataset.darkWired = '1';
      b.addEventListener('click', function () {
        var s = state();
        var dark = !s.dark;
        root.dataset.preset = dark ? PAIRS[s.base].dark : PAIRS[s.base].light;
        try { localStorage.setItem('palette-dark', dark ? 'true' : 'false'); } catch (e) {}
        apply();
        sync(Array.prototype.slice.call(btns));
        document.dispatchEvent(new CustomEvent('palette-darkchange'));
      });
    });
  })();