Start adding dark theme to popups on MapLibre maps

app/assets/stylesheets/maps_v2.css

@@ -66,6 +66,73 @@
   color: #111827;
 }
 
+/* MapLibre Popup Theme Support */
+.maplibregl-popup-content {
+  padding: 16px;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+}
+
+/* Larger close button */
+.maplibregl-popup-close-button {
+  width: 32px;
+  height: 32px;
+  font-size: 24px;
+  line-height: 32px;
+  right: 4px;
+  top: 4px;
+  padding: 0;
+  border-radius: 4px;
+  transition: background-color 0.2s;
+}
+
+.maplibregl-popup-close-button:hover {
+  background-color: rgba(0, 0, 0, 0.08);
+}
+
+/* Light theme (default) */
+.maplibregl-popup-content {
+  background-color: #ffffff;
+  color: #111827;
+}
+
+.maplibregl-popup-close-button {
+  color: #6b7280;
+}
+
+.maplibregl-popup-close-button:hover {
+  background-color: #f3f4f6;
+  color: #111827;
+}
+
+.maplibregl-popup-tip {
+  border-top-color: #ffffff;
+}
+
+/* Dark theme */
+html[data-theme="dark"] .maplibregl-popup-content,
+html.dark .maplibregl-popup-content {
+  background-color: #1f2937;
+  color: #f9fafb;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+}
+
+html[data-theme="dark"] .maplibregl-popup-close-button,
+html.dark .maplibregl-popup-close-button {
+  color: #d1d5db;
+}
+
+html[data-theme="dark"] .maplibregl-popup-close-button:hover,
+html.dark .maplibregl-popup-close-button:hover {
+  background-color: #374151;
+  color: #f9fafb;
+}
+
+html[data-theme="dark"] .maplibregl-popup-tip,
+html.dark .maplibregl-popup-tip {
+  border-top-color: #1f2937;
+}
+
 /* Connection Indicator */
 .connection-indicator {
   position: absolute;

app/javascript/maps_v2/utils/popup_theme.js

@@ -0,0 +1,120 @@
+/**
+ * Theme utilities for MapLibre popups
+ * Provides consistent theming across all popup types
+ */
+
+/**
+ * Get current theme from document
+ * @returns {string} 'dark' or 'light'
+ */
+export function getCurrentTheme() {
+  if (document.documentElement.getAttribute('data-theme') === 'dark' ||
+      document.documentElement.classList.contains('dark')) {
+    return 'dark'
+  }
+  return 'light'
+}
+
+/**
+ * Get theme-aware color values
+ * @param {string} theme - 'dark' or 'light'
+ * @returns {Object} Color values for the theme
+ */
+export function getThemeColors(theme = getCurrentTheme()) {
+  if (theme === 'dark') {
+    return {
+      // Background colors
+      background: '#1f2937',
+      backgroundAlt: '#374151',
+
+      // Text colors
+      textPrimary: '#f9fafb',
+      textSecondary: '#d1d5db',
+      textMuted: '#9ca3af',
+
+      // Border colors
+      border: '#4b5563',
+      borderLight: '#374151',
+
+      // Accent colors
+      accent: '#3b82f6',
+      accentHover: '#2563eb',
+
+      // Badge colors
+      badgeSuggested: { bg: '#713f12', text: '#fef3c7' },
+      badgeConfirmed: { bg: '#065f46', text: '#d1fae5' }
+    }
+  } else {
+    return {
+      // Background colors
+      background: '#ffffff',
+      backgroundAlt: '#f9fafb',
+
+      // Text colors
+      textPrimary: '#111827',
+      textSecondary: '#374151',
+      textMuted: '#6b7280',
+
+      // Border colors
+      border: '#e5e7eb',
+      borderLight: '#f3f4f6',
+
+      // Accent colors
+      accent: '#3b82f6',
+      accentHover: '#2563eb',
+
+      // Badge colors
+      badgeSuggested: { bg: '#fef3c7', text: '#92400e' },
+      badgeConfirmed: { bg: '#d1fae5', text: '#065f46' }
+    }
+  }
+}
+
+/**
+ * Get base popup styles as inline CSS
+ * @param {string} theme - 'dark' or 'light'
+ * @returns {string} CSS string for inline styles
+ */
+export function getPopupBaseStyles(theme = getCurrentTheme()) {
+  const colors = getThemeColors(theme)
+
+  return `
+    font-family: system-ui, -apple-system, sans-serif;
+    background-color: ${colors.background};
+    color: ${colors.textPrimary};
+  `
+}
+
+/**
+ * Get popup container class with theme
+ * @param {string} baseClass - Base CSS class name
+ * @param {string} theme - 'dark' or 'light'
+ * @returns {string} Class name with theme
+ */
+export function getPopupClass(baseClass, theme = getCurrentTheme()) {
+  return `${baseClass} ${baseClass}--${theme}`
+}
+
+/**
+ * Listen for theme changes and update popup if needed
+ * @param {Function} callback - Callback to execute on theme change
+ * @returns {Function} Cleanup function to remove listener
+ */
+export function onThemeChange(callback) {
+  const observer = new MutationObserver((mutations) => {
+    mutations.forEach((mutation) => {
+      if (mutation.type === 'attributes' &&
+          (mutation.attributeName === 'data-theme' ||
+           mutation.attributeName === 'class')) {
+        callback(getCurrentTheme())
+      }
+    })
+  })
+
+  observer.observe(document.documentElement, {
+    attributes: true,
+    attributeFilter: ['data-theme', 'class']
+  })
+
+  return () => observer.disconnect()
+}