brouter-web: robust dark toggle (floating button + injected style)

The navbar toggle was invisible/zero-width; replaced with a fixed floating
button (bottom-right). Dark mode now injects a <style> keyed on body.bw-dark
covering the tile layer, right sidebar, left toolbar (zoom/draw controls) and
the bottom elevation profile panel (incl. the chart drawn later on route).

tools/brouter-web/baldav-custom.js

@@ -1,31 +1,60 @@
 (function () {
   var LS_DARK = "baldav_bw_dark";
-  function apply() { document.body.classList.toggle("bw-dark", localStorage.getItem(LS_DARK) === "1"); }
-  function toggle() {
-    var on = localStorage.getItem(LS_DARK) !== "1";
-    localStorage.setItem(LS_DARK, on ? "1" : "0");
-    apply();
-    var b = document.getElementById("baldav-daynight");
-    if (b) b.textContent = on ? "☀" : "☾"; // sun / moon
+  function isDark() { try { return localStorage.getItem(LS_DARK) === "1"; } catch (e) { return false; } }
+
+  // Inject the dark rules as a <style> in <head> (no dependency on an external CSS file,
+  // and it covers elements created later — e.g. the elevation chart, drawn only once a
+  // route exists). Toggling body.bw-dark activates/deactivates everything.
+  function injectStyle() {
+    if (document.getElementById("baldav-dark-style")) return;
+    var st = document.createElement("style");
+    st.id = "baldav-dark-style";
+    st.textContent = [
+      "body.bw-dark .leaflet-tile-pane{filter:invert(1) hue-rotate(180deg) brightness(1.5)}",
+      "body.bw-dark .leaflet-container{background:#1b1f24}",
+      // right sidebar / layers panel
+      "body.bw-dark #sidebar,body.bw-dark #sidebar .leaflet-sidebar-content,body.bw-dark .leaflet-sidebar-pane,body.bw-dark .leaflet-control-layers,body.bw-dark .leaflet-control-layers-expanded{background:#20242a!important;color:#dfe3e8!important}",
+      "body.bw-dark #sidebar label,body.bw-dark #sidebar span,body.bw-dark #sidebar a,body.bw-dark #sidebar h1,body.bw-dark #sidebar h2{color:#dfe3e8!important}",
+      "body.bw-dark #sidebar input[type=text],body.bw-dark #sidebar select{background:#2b3038!important;color:#dfe3e8!important;border-color:#454b54!important}",
+      // left toolbar + all leaflet control buttons (zoom, draw, etc.)
+      "body.bw-dark .leaflet-bar a,body.bw-dark .leaflet-control-zoom a,body.bw-dark .leaflet-control a,body.bw-dark .leaflet-control button{background:#2b3038!important;color:#fff!important;border-color:#454b54!important}",
+      "body.bw-dark .leaflet-bar a:hover,body.bw-dark .leaflet-control a:hover{background:#3a4048!important}",
+      // bottom elevation profile panel
+      "body.bw-dark .elevation,body.bw-dark #elevation-chart,body.bw-dark .elevation-summary{background:#20242a!important;color:#dfe3e8!important}",
+      "body.bw-dark .elevation text{fill:#dfe3e8!important}",
+      "body.bw-dark .elevation .domain,body.bw-dark .elevation .tick line,body.bw-dark .elevation .grid line{stroke:#55606a!important}",
+      "body.bw-dark .elevation path.area,body.bw-dark .elevation .area{fill:#2b3038!important;opacity:.6}"
+    ].join("\n");
+    (document.head || document.documentElement).appendChild(st);
   }
+
+  function apply() {
+    document.body.classList.toggle("bw-dark", isDark());
+    var b = document.getElementById("baldav-daynight");
+    if (b) b.textContent = isDark() ? "☀ День" : "☾ Ночь";
+  }
+  function toggle() {
+    try { localStorage.setItem(LS_DARK, isDark() ? "0" : "1"); } catch (e) {}
+    apply();
+  }
+  // Standalone floating button — independent of the navbar so it can't be invisible or
+  // zero-width. Fixed bottom-right, explicit colours/size.
   function addButton() {
     if (document.getElementById("baldav-daynight")) return true;
-    var exp = document.getElementById("exportButton");
-    if (!exp) return false;
-    var item = exp.closest(".nav-item") || exp.parentNode;
-    var li = document.createElement("div"); li.className = item.className || "nav-item";
-    var a = document.createElement("a");
-    a.id = "baldav-daynight"; a.className = exp.className || "nav-link"; a.href = "#";
-    a.title = "Тёмная карта";
-    a.textContent = (localStorage.getItem(LS_DARK) === "1") ? "☀" : "☾";
-    a.onclick = function (e) { e.preventDefault(); toggle(); };
-    li.appendChild(a);
-    item.parentNode.insertBefore(li, item);
+    var a = document.createElement("button");
+    a.id = "baldav-daynight";
+    a.type = "button";
+    a.textContent = isDark() ? "☀ День" : "☾ Ночь";
+    a.style.cssText = "position:fixed;bottom:24px;right:24px;z-index:100000;" +
+      "padding:8px 12px;font:600 14px sans-serif;background:#2b3038;color:#fff;" +
+      "border:1px solid #667;border-radius:8px;cursor:pointer;box-shadow:0 2px 6px rgba(0,0,0,.5)";
+    a.addEventListener("click", function (e) { e.preventDefault(); e.stopPropagation(); toggle(); });
+    document.body.appendChild(a);
     return true;
   }
   var WANT = ["Cycling","Hiking","Bench","Toilets","Bank","ATM","Bar","BBQ","Cafe","Drinking water","Fast food","Food court","Pub","Restaurant","Bicycle parking","Bus station","Bakery","Beverages","Coffee","Supermarket","Picnic site","Viewpoint","Shelter","Route quality"];
   function setDefaultOverlays() {
-    if (localStorage.getItem("baldav_bw_overlays_v1") === "1") return true;
+    try { if (localStorage.getItem("baldav_bw_overlays_v1") === "1") return true; } catch (e) {}
     var labels = document.querySelectorAll("#layers-control-wrapper label, .leaflet-control-layers-overlays label");
     if (!labels.length) return false;
     labels.forEach(function (lab) {
@@ -34,16 +63,17 @@
       var cb = lab.querySelector("input[type=checkbox]") || lab.control || (lab.htmlFor && document.getElementById(lab.htmlFor));
       if (cb && cb.type === "checkbox" && !cb.checked) cb.click();
     });
-    localStorage.setItem("baldav_bw_overlays_v1", "1");
+    try { localStorage.setItem("baldav_bw_overlays_v1", "1"); } catch (e) {}
     return true;
   }
   function init() {
+    injectStyle();
     apply();
     var tries = 0;
     var iv = setInterval(function () {
       tries++;
-      var b = addButton(), o = setDefaultOverlays();
-      if ((b && o) || tries > 40) clearInterval(iv);
+      var b = addButton(); var o = setDefaultOverlays();
+      if ((b && o) || tries > 60) clearInterval(iv);
     }, 500);
   }
   if (document.readyState !== "loading") init(); else document.addEventListener("DOMContentLoaded", init);