(function () {
  var root = document.documentElement;
  var toggle = document.getElementById("theme-toggle");
  if (toggle) {
    toggle.addEventListener("click", function () {
      var isLight = root.classList.contains("light");
      root.classList.remove("light", "dark");
      var next = isLight ? "dark" : "light";
      root.classList.add(next);
      localStorage.setItem("theme", next);
    });
  }

  var mapEl = document.getElementById("track-map");
  if (mapEl && window.L) {
    var coords = JSON.parse(mapEl.dataset.track || "[]");
    // KML/GeoJSON order is [lon, lat, elev?]; Leaflet wants [lat, lon].
    var latLngs = coords.map(function (c) { return [c[1], c[0]]; });
    if (latLngs.length) {
      var map = L.map(mapEl);
      L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
        attribution: "© OpenStreetMap contributors",
        maxZoom: 18,
      }).addTo(map);
      var line = L.polyline(latLngs, { color: "#3b82f6", weight: 3 }).addTo(map);
      map.fitBounds(line.getBounds(), { padding: [20, 20] });
      L.marker(latLngs[0]).addTo(map);
      L.marker(latLngs[latLngs.length - 1]).addTo(map);
    }
  }
})();