Cyberpunk visual overhaul

Dark CARTO basemap (was default bright OSM tiles), Orbitron/Share Tech
Mono fonts, neon cyan/magenta HUD chrome with glassmorphism panels,
glowing divIcon portal markers (pulsing when claimed) replacing plain
circle dots, neon drop-shadow filters on links/fields, and a subtle
scanline overlay. Login and team-pick screens restyled to match.

frontend/tailwind.config.js

@@ -3,9 +3,37 @@ export default {
   content: ['./index.html', './src/**/*.{vue,ts}'],
   theme: {
     extend: {
+      fontFamily: {
+        display: ['Orbitron', 'sans-serif'],
+        mono: ['"Share Tech Mono"', 'monospace'],
+      },
       colors: {
-        orange: { team: '#f97316' },
-        green: { team: '#22c55e' },
+        void: '#050508',
+        panel: '#0b0d16',
+        cyan: { neon: '#00fff2' },
+        magenta: { neon: '#ff00e5' },
+        orange: { neon: '#ff5f1f' },
+        green: { neon: '#39ff14' },
+      },
+      boxShadow: {
+        'glow-cyan': '0 0 6px #00fff2, 0 0 18px rgba(0,255,242,0.5)',
+        'glow-magenta': '0 0 6px #ff00e5, 0 0 18px rgba(255,0,229,0.5)',
+        'glow-orange': '0 0 6px #ff5f1f, 0 0 18px rgba(255,95,31,0.6)',
+        'glow-green': '0 0 6px #39ff14, 0 0 18px rgba(57,255,20,0.6)',
+      },
+      animation: {
+        'pulse-glow': 'pulse-glow 2.4s ease-in-out infinite',
+        scan: 'scan 6s linear infinite',
+      },
+      keyframes: {
+        'pulse-glow': {
+          '0%, 100%': { opacity: 1 },
+          '50%': { opacity: 0.55 },
+        },
+        scan: {
+          '0%': { backgroundPosition: '0 0' },
+          '100%': { backgroundPosition: '0 64px' },
+        },
       },
     },
   },