diff --git a/frontend/components/dashboard/Dashboard.module.css b/frontend/components/dashboard/Dashboard.module.css
index cd5d13e7..0e890c02 100644
--- a/frontend/components/dashboard/Dashboard.module.css
+++ b/frontend/components/dashboard/Dashboard.module.css
@@ -2394,6 +2394,164 @@
   filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.22));
 }
 
+/* ── Light Theme Dashboard Overrides ── */
+:global(html.light) .root {
+  background:
+    radial-gradient(circle at 22% 12%, rgba(14, 165, 233, 0.16), transparent 28%),
+    radial-gradient(circle at 78% 0%, rgba(59, 130, 246, 0.12), transparent 24%),
+    linear-gradient(180deg, #f8fbff 0%, #e7f1fb 100%);
+}
+
+:global(html.light) .root :global(.map) {
+  background: #dfeefa;
+  border-color: rgba(36, 68, 104, 0.18);
+  filter: none;
+  box-shadow:
+    0 28px 80px rgba(31, 64, 104, 0.18),
+    inset 0 1px 0 rgba(255, 255, 255, 0.86);
+}
+
+:global(html.light) .root :global(.map .leaflet-tile) {
+  filter: saturate(1.08) contrast(0.98) brightness(1.02);
+}
+
+:global(html.light) .weatherAura {
+  opacity: 0.22;
+  mix-blend-mode: multiply;
+}
+
+:global(html.light) .weatherAuraScrim {
+  background:
+    linear-gradient(
+      180deg,
+      rgba(248, 252, 255, 0.2) 0%,
+      rgba(248, 252, 255, 0.08) 42%,
+      rgba(226, 239, 250, 0.28) 100%
+    ),
+    radial-gradient(
+      circle at 50% 58%,
+      rgba(14, 165, 233, 0.08) 0%,
+      rgba(14, 165, 233, 0) 52%
+    );
+}
+
+:global(html.light) .root :global(.home-map-title strong),
+:global(html.light) .root :global(.home-panel-city h2),
+:global(html.light) .root :global(.home-weather-main strong),
+:global(html.light) .root :global(.home-weather-stat strong),
+:global(html.light) .root :global(.home-deb-card strong),
+:global(html.light) .root :global(.home-card-section h3),
+:global(html.light) .root :global(.home-summary-card-head strong),
+:global(html.light) .root :global(.opportunity-strip-heading strong),
+:global(html.light) .root :global(.opportunity-city),
+:global(html.light) .root :global(.home-summary-stat b),
+:global(html.light) .root :global(.city-item .city-name-text) {
+  color: #0b1726;
+}
+
+:global(html.light) .root :global(.home-map-title span),
+:global(html.light) .root :global(.home-panel-subtitle),
+:global(html.light) .root :global(.home-weather-sub),
+:global(html.light) .root :global(.home-weather-label),
+:global(html.light) .root :global(.home-weather-stat span),
+:global(html.light) .root :global(.home-weather-stat small),
+:global(html.light) .root :global(.home-deb-card small),
+:global(html.light) .root :global(.home-card-section h3 small),
+:global(html.light) .root :global(.home-summary-stat span),
+:global(html.light) .root :global(.opportunity-strip-heading span),
+:global(html.light) .root :global(.opportunity-meta),
+:global(html.light) .root :global(.city-group-title),
+:global(html.light) .root :global(.home-panel-kicker),
+:global(html.light) .root :global(.home-panel-airport) {
+  color: rgba(66, 84, 108, 0.86);
+}
+
+:global(html.light) .root :global(.header) {
+  background: rgba(248, 252, 255, 0.9);
+  border-bottom-color: rgba(36, 68, 104, 0.14);
+  box-shadow: 0 12px 34px rgba(31, 64, 104, 0.08);
+}
+
+:global(html.light) .root :global(.city-list),
+:global(html.light) .root :global(.home-intelligence-panel),
+:global(html.light) .root :global(.home-opportunity-strip) {
+  background:
+    radial-gradient(circle at 12% 0%, rgba(14, 165, 233, 0.08), transparent 34%),
+    rgba(248, 252, 255, 0.9);
+  border-color: rgba(36, 68, 104, 0.16);
+  box-shadow: 0 28px 70px rgba(31, 64, 104, 0.14);
+  color: #0b1726;
+}
+
+:global(html.light) .root :global(.home-summary-card),
+:global(html.light) .root :global(.opportunity-card),
+:global(html.light) .root :global(.home-deb-card),
+:global(html.light) .root :global(.home-card-section),
+:global(html.light) .root :global(.home-metric-card),
+:global(html.light) .root :global(.home-forecast-item),
+:global(html.light) .root :global(.home-intraday-reports span) {
+  background:
+    radial-gradient(circle at 100% 0%, rgba(14, 165, 233, 0.08), transparent 36%),
+    rgba(255, 255, 255, 0.92);
+  border-color: rgba(36, 68, 104, 0.14);
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.82);
+  color: #0b1726;
+}
+
+:global(html.light) .root :global(.home-weather-hero) {
+  background:
+    linear-gradient(135deg, rgba(238, 246, 255, 0.98), rgba(216, 233, 248, 0.92));
+  border-color: rgba(36, 68, 104, 0.14);
+}
+
+:global(html.light) .root :global(.home-card-section.intraday),
+:global(html.light) .root :global(.home-card-section.probability) {
+  background:
+    radial-gradient(circle at 0% 25%, rgba(14, 165, 233, 0.1), transparent 42%),
+    rgba(255, 255, 255, 0.92);
+}
+
+:global(html.light) .root :global(.home-intraday-chart line) {
+  stroke: rgba(66, 84, 108, 0.16);
+}
+
+:global(html.light) .root :global(.home-intraday-reports strong),
+:global(html.light) .root :global(.home-probability-threshold),
+:global(html.light) .root :global(.home-market-question strong),
+:global(html.light) .root :global(.home-market-metrics strong),
+:global(html.light) .root :global(.home-forecast-item strong) {
+  color: #0b1726;
+}
+
+:global(html.light) .root :global(.home-probability-row div),
+:global(html.light) .root :global(.home-probability-track) {
+  background: rgba(37, 57, 82, 0.12);
+}
+
+:global(html.light) .root :global(.city-group) {
+  background: rgba(255, 255, 255, 0.54);
+  border-color: rgba(36, 68, 104, 0.12);
+}
+
+:global(html.light) .root :global(.city-group-header:hover),
+:global(html.light) .root :global(.city-item:hover) {
+  background: rgba(221, 235, 250, 0.86);
+}
+
+:global(html.light) .root :global(.city-item.active) {
+  background:
+    linear-gradient(90deg, rgba(14, 165, 233, 0.18), rgba(14, 165, 233, 0.06)),
+    rgba(255, 255, 255, 0.88);
+  border-color: rgba(14, 165, 233, 0.42);
+}
+
+:global(html.light) .root :global(.leaflet-control-attribution),
+:global(html.light) .root :global(.leaflet-control-zoom a) {
+  background: rgba(248, 252, 255, 0.86) !important;
+  border-color: rgba(36, 68, 104, 0.16) !important;
+  color: #0b1726 !important;
+}
+
 @keyframes home-panel-enter {
   from {
     opacity: 0;
diff --git a/frontend/hooks/useLeafletMap.ts b/frontend/hooks/useLeafletMap.ts
index dca18654..d76ec555 100644
--- a/frontend/hooks/useLeafletMap.ts
+++ b/frontend/hooks/useLeafletMap.ts
@@ -34,6 +34,10 @@ const AUTO_NEARBY_MAX_DISTANCE_M = 120000;
 const AUTO_NEARBY_IDLE_REFRESH_DELAY_MS = 10_000;
 const AUTO_NEARBY_MIN_REFRESH_INTERVAL_MS = 60_000;
 const MAP_MAX_ZOOM = 19;
+const MAP_TILE_URLS = {
+  dark: "https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png",
+  light: "https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png",
+} as const;
 const CITY_MARKER_DISPLAY_OFFSETS: Record<
   string,
   { x: number; y: number; zIndexOffset?: number }
@@ -52,6 +56,16 @@ function getMarkerDisplayOffset(cityName: string) {
   };
 }
 
+function getMapTileUrl() {
+  if (
+    typeof document !== "undefined" &&
+    document.documentElement.classList.contains("light")
+  ) {
+    return MAP_TILE_URLS.light;
+  }
+  return MAP_TILE_URLS.dark;
+}
+
 function pickMarkerTemperature(
   snapshot?: Pick<CityDetail, "current" | "temp_symbol"> | CitySummary,
 ) {
@@ -382,6 +396,7 @@ export function useLeafletMap({
 }: UseLeafletMapArgs) {
   const containerRef = useRef<HTMLDivElement | null>(null);
   const mapRef = useRef<L.Map | null>(null);
+  const tileLayerRef = useRef<L.TileLayer | null>(null);
   const markersRef = useRef<
     Record<string, { city: CityListItem; marker: L.Marker }>
   >({});
@@ -444,18 +459,16 @@ export function useLeafletMap({
     });
 
     L.control.zoom({ position: "bottomright" }).addTo(map);
-    L.tileLayer(
-      "https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png",
-      {
-        attribution:
-          '&copy; <a href="https://www.openstreetmap.org/">OSM</a> &copy; <a href="https://carto.com/">CARTO</a>',
-        maxZoom: 19,
-        subdomains: "abcd",
-      },
-    ).addTo(map);
+    const tileLayer = L.tileLayer(getMapTileUrl(), {
+      attribution:
+        '&copy; <a href="https://www.openstreetmap.org/">OSM</a> &copy; <a href="https://carto.com/">CARTO</a>',
+      maxZoom: 19,
+      subdomains: "abcd",
+    }).addTo(map);
 
     const nearbyLayer = L.layerGroup().addTo(map);
     mapRef.current = map;
+    tileLayerRef.current = tileLayer;
     nearbyLayerRef.current = nearbyLayer;
 
     // Track which city we've already moved to for the current selection
@@ -515,11 +528,30 @@ export function useLeafletMap({
       map.off("click", handleMapClick);
       map.remove();
       mapRef.current = null;
+      tileLayerRef.current = null;
       nearbyLayerRef.current = null;
       markersRef.current = {};
     };
   }, []);
 
+  useEffect(() => {
+    const tileLayer = tileLayerRef.current;
+    if (!tileLayer || typeof MutationObserver === "undefined") return;
+
+    const syncMapTheme = () => {
+      tileLayer.setUrl(getMapTileUrl());
+    };
+    syncMapTheme();
+
+    const observer = new MutationObserver(syncMapTheme);
+    observer.observe(document.documentElement, {
+      attributeFilter: ["class"],
+      attributes: true,
+    });
+
+    return () => observer.disconnect();
+  }, []);
+
   // Handle initial view if cities are loaded
   useEffect(() => {
     const map = mapRef.current;