1.3.0

dev-dist/registerSW.js

@@ -1 +0,0 @@
-if('serviceWorker' in navigator) navigator.serviceWorker.register('/dev-sw.js?dev-sw', { scope: '/', type: 'classic' })

dev-dist/sw.js

@@ -1,92 +0,0 @@
-/**
- * Copyright 2018 Google Inc. All Rights Reserved.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *     http://www.apache.org/licenses/LICENSE-2.0
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// If the loader is already loaded, just stop.
-if (!self.define) {
-  let registry = {};
-
-  // Used for `eval` and `importScripts` where we can't get script URL by other means.
-  // In both cases, it's safe to use a global var because those functions are synchronous.
-  let nextDefineUri;
-
-  const singleRequire = (uri, parentUri) => {
-    uri = new URL(uri + ".js", parentUri).href;
-    return registry[uri] || (
-      
-        new Promise(resolve => {
-          if ("document" in self) {
-            const script = document.createElement("script");
-            script.src = uri;
-            script.onload = resolve;
-            document.head.appendChild(script);
-          } else {
-            nextDefineUri = uri;
-            importScripts(uri);
-            resolve();
-          }
-        })
-      
-      .then(() => {
-        let promise = registry[uri];
-        if (!promise) {
-          throw new Error(`Module ${uri} didn’t register its module`);
-        }
-        return promise;
-      })
-    );
-  };
-
-  self.define = (depsNames, factory) => {
-    const uri = nextDefineUri || ("document" in self ? document.currentScript.src : "") || location.href;
-    if (registry[uri]) {
-      // Module is already loading or loaded.
-      return;
-    }
-    let exports = {};
-    const require = depUri => singleRequire(depUri, uri);
-    const specialDeps = {
-      module: { uri },
-      exports,
-      require
-    };
-    registry[uri] = Promise.all(depsNames.map(
-      depName => specialDeps[depName] || require(depName)
-    )).then(deps => {
-      factory(...deps);
-      return exports;
-    });
-  };
-}
-define(['./workbox-5a5d9309'], (function (workbox) { 'use strict';
-
-  self.skipWaiting();
-  workbox.clientsClaim();
-
-  /**
-   * The precacheAndRoute() method efficiently caches and responds to
-   * requests for URLs in the manifest.
-   * See https://goo.gl/S9QRab
-   */
-  workbox.precacheAndRoute([{
-    "url": "registerSW.js",
-    "revision": "3ca0b8505b4bec776b69afdba2768812"
-  }, {
-    "url": "index.html",
-    "revision": "0.eh0stsihuc8"
-  }], {});
-  workbox.cleanupOutdatedCaches();
-  workbox.registerRoute(new workbox.NavigationRoute(workbox.createHandlerBoundToURL("index.html"), {
-    allowlist: [/^\/$/]
-  }));
-
-}));

package.json

@@ -1,11 +1,12 @@
 {
   "name": "vue-nonograms-solid",
-  "version": "1.0.0",
+  "version": "1.3.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest"
   },
   "dependencies": {
     "fireworks-js": "^2.10.8",
@@ -16,7 +17,10 @@
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.0.4",
+    "@vue/test-utils": "^2.4.6",
+    "jsdom": "^28.0.0",
     "vite": "^5.1.4",
-    "vite-plugin-pwa": "^0.20.5"
+    "vite-plugin-pwa": "^0.20.5",
+    "vitest": "^4.0.18"
   }
 }

src/App.vue

@@ -9,6 +9,7 @@ import GuidePanel from './components/GuidePanel.vue';
 import WinModal from './components/WinModal.vue';
 import CustomGameModal from './components/CustomGameModal.vue';
 import FixedBar from './components/FixedBar.vue';
+import ReloadPrompt from './components/ReloadPrompt.vue';
 
 // Main App Entry
 const store = usePuzzleStore();
@@ -21,6 +22,7 @@ const installDismissed = ref(false);
 const isCoarsePointer = ref(false);
 const isStandalone = ref(false);
 const themePreference = ref('system');
+const appVersion = __APP_VERSION__;
 let displayModeMedia = null;
 let prefersColorSchemeMedia = null;
 
@@ -164,10 +166,15 @@ onUnmounted(() => {
       </section>
     </div>
 
+    <footer class="app-version">
+      v{{ appVersion }}
+    </footer>
+
     <!-- Modals Teleport -->
     <Teleport to="body">
       <WinModal v-if="store.isGameWon" />
       <CustomGameModal v-if="showCustomModal" @close="showCustomModal = false" />
+      <ReloadPrompt />
     </Teleport>
   </main>
 </template>
@@ -183,8 +190,8 @@ onUnmounted(() => {
 }
 
 .install-banner {
-  background: rgba(0, 242, 254, 0.1);
-  border: 1px solid var(--primary-neon);
+  background: var(--banner-bg);
+  border: 1px solid var(--banner-border);
   border-radius: 8px;
   padding: 10px 20px;
   display: flex;
@@ -193,10 +200,11 @@ onUnmounted(() => {
   width: 90%;
   max-width: 600px;
   margin-bottom: 20px;
+  box-shadow: var(--banner-shadow);
 }
 
 .install-text {
-  color: #fff;
+  color: var(--text-color);
 }
 
 .install-actions {
@@ -208,7 +216,7 @@ onUnmounted(() => {
 .install-close {
   background: transparent;
   border: none;
-  color: #aaa;
+  color: var(--text-muted);
   font-size: 1.5rem;
   cursor: pointer;
 }
@@ -238,4 +246,20 @@ onUnmounted(() => {
 .fade-leave-to {
   opacity: 0;
 }
+
+.app-version {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  width: 100%;
+  text-align: center;
+  padding: 10px;
+  font-size: 0.8rem;
+  color: var(--text-muted);
+  opacity: 0.8;
+  background: var(--panel-bg);
+  backdrop-filter: blur(5px);
+  border-top: 1px solid var(--panel-border);
+  z-index: 90;
+}
 </style>

src/components/Cell.vue

@@ -34,35 +34,30 @@ const clearLongPress = () => {
 
 const handlePointerDown = (e) => {
   if (e.pointerType === 'mouse') {
-    if (e.button === 0) emit('start-drag', props.r, props.c, false);
-    if (e.button === 2) emit('start-drag', props.r, props.c, true);
+    if (e.button === 0) emit('start-drag', props.r, props.c, false, false);
+    if (e.button === 2) emit('start-drag', props.r, props.c, true, false);
     return;
   }
-  longPressTriggered = false;
-  clearLongPress();
-  longPressTimer = setTimeout(() => {
-    longPressTriggered = true;
-    emit('start-drag', props.r, props.c, true);
-  }, 450);
+  
+  // Touch logic
+  const now = Date.now();
+  if (now - lastTap < 300) {
+    // Double tap -> X (Force)
+    emit('start-drag', props.r, props.c, true, true);
+    lastTap = 0;
+  } else {
+    // Single tap / Start drag -> Fill
+    emit('start-drag', props.r, props.c, false, false);
+    lastTap = now;
+  }
 };
 
 const handlePointerUp = (e) => {
-  if (e.pointerType === 'mouse') return;
-  clearLongPress();
-  if (longPressTriggered) return;
-  const now = Date.now();
-  const isDoubleTap = now - lastTap < 300;
-  lastTap = now;
-  if (isDoubleTap) {
-    emit('start-drag', props.r, props.c, true);
-  } else {
-    emit('start-drag', props.r, props.c, false);
-  }
+  // Handled in pointerdown
 };
 
 const handlePointerCancel = (e) => {
-  if (e.pointerType === 'mouse') return;
-  clearLongPress();
+  // Handled in pointerdown
 };
 </script>
 

src/components/CustomGameModal.vue

@@ -1,13 +1,15 @@
 <script setup>
-import { ref } from 'vue';
+import { ref, computed } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useI18n } from '@/composables/useI18n';
+import { calculateDifficulty } from '@/utils/puzzleUtils';
 
 const emit = defineEmits(['close']);
 const store = usePuzzleStore();
 const { t } = useI18n();
 
 const customSize = ref(10);
+const fillRate = ref(50);
 const errorMsg = ref('');
 
 const snapToStep = (value, step) => {
@@ -19,6 +21,20 @@ const handleSnap = () => {
   customSize.value = snapToStep(Number(customSize.value), 5);
 };
 
+const difficultyLevel = computed(() => {
+  return calculateDifficulty(fillRate.value / 100);
+});
+
+const difficultyColor = computed(() => {
+  switch(difficultyLevel.value) {
+    case 'extreme': return '#ff3333';
+    case 'hardest': return '#ff9933';
+    case 'harder': return '#ffff33';
+    case 'easy': return '#33ff33';
+    default: return '#33ff33';
+  }
+});
+
 const confirm = () => {
   const size = parseInt(customSize.value);
   if (isNaN(size) || size < 5 || size > 80) {
@@ -26,7 +42,7 @@ const confirm = () => {
     return;
   }
   
-  store.initCustomGame(size);
+  store.initCustomGame(size, fillRate.value / 100);
   emit('close');
 };
 </script>
@@ -52,6 +68,29 @@ const confirm = () => {
           <span>80</span>
         </div>
       </div>
+
+      <p>{{ t('custom.fillRate') }}</p>
+      <div class="input-group">
+        <div class="range-value">{{ fillRate }}%</div>
+        <input 
+          type="range" 
+          v-model="fillRate" 
+          min="10" 
+          max="90"
+          step="5"
+        />
+        <div class="range-scale">
+          <span>10%</span>
+          <span>90%</span>
+        </div>
+      </div>
+
+      <div class="difficulty-indicator">
+        <span class="label">{{ t('custom.difficulty') }}:</span>
+        <span class="value" :style="{ color: difficultyColor }">
+          {{ t(`difficulty.${difficultyLevel}`) }}
+        </span>
+      </div>
       
       <p v-if="errorMsg" class="error">{{ errorMsg }}</p>
 
@@ -87,6 +126,7 @@ const confirm = () => {
   border: 1px solid var(--accent-cyan);
   box-shadow: 0 0 50px rgba(0, 242, 255, 0.2);
   animation: slideUp 0.3s ease;
+  transition: all 0.3s ease-in-out;
 }
 
 h2 {
@@ -161,6 +201,31 @@ input[type="range"]::-moz-range-thumb {
     font-size: 0.85rem;
 }
 
+.difficulty-indicator {
+    margin: 20px 0;
+    font-size: 1.2rem;
+    display: flex;
+    justify-content: center;
+    gap: 10px;
+    align-items: center;
+    white-space: nowrap;
+    height: 1.5em; /* Reserve space for one line of text */
+}
+
+.difficulty-indicator .label {
+    color: var(--text-color);
+}
+
+.difficulty-indicator .value {
+    font-weight: bold;
+    text-transform: uppercase;
+    text-shadow: 0 0 10px currentColor;
+    transition: color 0.3s ease;
+    display: inline-block;
+    min-width: 120px; /* Reserve space for longest text */
+    text-align: left;
+}
+
 .error {
     color: #ff4d4d;
     font-size: 0.9rem;

src/components/GameBoard.vue

@@ -15,6 +15,94 @@ const rowHintsRef = ref(null);
 const activeRow = ref(null);
 const activeCol = ref(null);
 const isFinePointer = ref(false);
+const scrollWrapper = ref(null);
+const scrollTrack = ref(null);
+const showScrollbar = ref(false);
+const thumbWidth = ref(20);
+const thumbLeft = ref(0);
+let isDraggingScroll = false;
+let dragStartX = 0;
+let dragStartLeft = 0;
+
+const checkScroll = () => {
+  const el = scrollWrapper.value;
+  if (!el) return;
+  const sw = el.scrollWidth;
+  const cw = el.clientWidth;
+  
+  // Only show custom scrollbar on mobile/tablet (width < 768px) and if content overflows
+  const isMobile = window.innerWidth <= 768;
+  showScrollbar.value = isMobile && (sw > cw + 1);
+  
+  if (showScrollbar.value) {
+    // Thumb width percentage = (viewport / total) * 100
+    const ratio = cw / sw;
+    thumbWidth.value = Math.max(10, ratio * 100);
+  }
+};
+
+const handleScroll = () => {
+  if (isDraggingScroll) return;
+  const el = scrollWrapper.value;
+  if (!el) return;
+  const sw = el.scrollWidth;
+  const cw = el.clientWidth;
+  const sl = el.scrollLeft;
+  const maxScroll = sw - cw;
+  if (maxScroll <= 0) return;
+  
+  // Map scroll position to thumb position (0 to 100 - thumbWidth)
+  const maxThumb = 100 - thumbWidth.value;
+  thumbLeft.value = (sl / maxScroll) * maxThumb;
+};
+
+const startScrollDrag = (e) => {
+  isDraggingScroll = true;
+  dragStartX = e.clientX || e.touches[0].clientX;
+  dragStartLeft = thumbLeft.value;
+  
+  document.addEventListener('mousemove', onScrollDrag);
+  document.addEventListener('mouseup', stopScrollDrag);
+  document.addEventListener('touchmove', onScrollDrag, { passive: false });
+  document.addEventListener('touchend', stopScrollDrag);
+};
+
+const onScrollDrag = (e) => {
+  if (!isDraggingScroll || !scrollTrack.value) return;
+  
+  const clientX = e.clientX || (e.touches ? e.touches[0].clientX : 0);
+  const deltaX = clientX - dragStartX;
+  const trackWidth = scrollTrack.value.offsetWidth;
+  
+  if (trackWidth === 0) return;
+  
+  // Calculate delta as percentage of track
+  const deltaPercent = (deltaX / trackWidth) * 100;
+  
+  // New thumb position
+  let newLeft = dragStartLeft + deltaPercent;
+  const maxThumb = 100 - thumbWidth.value;
+  newLeft = Math.max(0, Math.min(maxThumb, newLeft));
+  
+  thumbLeft.value = newLeft;
+  
+  // Sync scroll
+  const el = scrollWrapper.value;
+  if (el) {
+    const sw = el.scrollWidth;
+    const cw = el.clientWidth;
+    const maxScroll = sw - cw;
+    el.scrollLeft = (newLeft / maxThumb) * maxScroll;
+  }
+};
+
+const stopScrollDrag = () => {
+  isDraggingScroll = false;
+  document.removeEventListener('mousemove', onScrollDrag);
+  document.removeEventListener('mouseup', stopScrollDrag);
+  document.removeEventListener('touchmove', onScrollDrag);
+  document.removeEventListener('touchend', stopScrollDrag);
+};
 
 const getRowHintsWidth = () => {
   const el = rowHintsRef.value?.$el;
@@ -23,17 +111,27 @@ const getRowHintsWidth = () => {
 };
 
 const computeCellSize = () => {
-  const vw = Math.min(window.innerWidth, 900);
   const rootStyles = getComputedStyle(document.documentElement);
   const hintWidth = getRowHintsWidth();
   const gapRaw = rootStyles.getPropertyValue('--gap-size') || '2px';
   const gridPadRaw = rootStyles.getPropertyValue('--grid-padding') || '5px';
   const gap = parseFloat(gapRaw);
   const gridPad = parseFloat(gridPadRaw);
-  const bodyStyles = getComputedStyle(document.body);
-  const bodyPadding = parseFloat(bodyStyles.paddingLeft) + parseFloat(bodyStyles.paddingRight);
-  const availableForGrid = vw - bodyPadding - hintWidth;
+
+  let containerWidth;
+  if (scrollWrapper.value) {
+    containerWidth = scrollWrapper.value.clientWidth;
+  } else {
+    // Fallback if wrapper not ready: window width minus estimated padding
+    // Body padding (40) + Layout padding (40) = 80
+    containerWidth = window.innerWidth - 80;
+  }
+  
+  // Ensure we don't have negative space
+  const availableForGrid = Math.max(0, containerWidth - hintWidth);
+  
   const size = Math.floor((availableForGrid - gridPad * 2 - (store.size - 1) * gap) / store.size);
+  // Keep min 18, max 36
   cellSize.value = Math.max(18, Math.min(36, size));
 };
 
@@ -74,6 +172,7 @@ onMounted(() => {
   });
   isFinePointer.value = window.matchMedia('(pointer: fine)').matches;
   window.addEventListener('resize', computeCellSize);
+  window.addEventListener('resize', checkScroll);
   window.addEventListener('mouseup', handleGlobalMouseUp);
   window.addEventListener('pointerup', handleGlobalPointerUp);
   window.addEventListener('touchend', handleGlobalPointerUp, { passive: true });
@@ -81,6 +180,7 @@ onMounted(() => {
 
 onUnmounted(() => {
   window.removeEventListener('resize', computeCellSize);
+  window.removeEventListener('resize', checkScroll);
   window.removeEventListener('mouseup', handleGlobalMouseUp);
   window.removeEventListener('pointerup', handleGlobalPointerUp);
   window.removeEventListener('touchend', handleGlobalPointerUp);
@@ -89,11 +189,12 @@ onUnmounted(() => {
 watch(() => store.size, async () => {
   await nextTick();
   computeCellSize();
+  checkScroll();
 });
 </script>
 
 <template>
-  <div class="game-board-wrapper">
+  <div class="game-board-wrapper" ref="scrollWrapper" @scroll="handleScroll">
     <div class="game-container" :style="{ '--cell-size': `${cellSize}px` }">
       <div class="corner-spacer"></div>
       
@@ -131,13 +232,39 @@ watch(() => store.size, async () => {
       </div>
     </div>
   </div>
+
+  <Teleport to="body">
+    <div v-if="showScrollbar" class="fixed-scroll-bar">
+      <div class="fixed-scroll-track" ref="scrollTrack" @pointerdown="startScrollDrag">
+        <div 
+          class="fixed-scroll-thumb" 
+          :style="{ width: `${thumbWidth}%`, left: `${thumbLeft}%` }"
+        ></div>
+      </div>
+    </div>
+  </Teleport>
 </template>
 
 <style scoped>
 .game-board-wrapper {
   display: flex;
   flex-direction: column;
-  align-items: center;
+  align-items: flex-start;
+  overflow-x: auto;
+  width: 100%;
+  scrollbar-width: none; /* Hide default scrollbar */
+}
+
+/* Desktop: Remove scroll behavior to ensure full grid visibility */
+@media (min-width: 769px) {
+  .game-board-wrapper {
+    overflow-x: auto; /* Allow scrolling if grid is too large (e.g. 80x80) */
+    align-items: center; /* Center the grid on desktop */
+  }
+}
+
+.game-board-wrapper::-webkit-scrollbar {
+  display: none;
 }
 
 .game-container {
@@ -145,17 +272,24 @@ watch(() => store.size, async () => {
   grid-template-columns: auto auto;
   grid-template-rows: auto auto;
   gap: 0;
-  padding: 20px;
-  background: rgba(0, 0, 0, 0.2);
-  border-radius: 16px;
-  box-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
+  padding: 0;
+  background: transparent;
+  box-shadow: none;
   margin-top: 10px;
+  margin-left: auto;
+  margin-right: auto;
+  position: relative;
 }
 
 .corner-spacer {
   height: auto; /* Adapts to Col Hints height */
 }
 
+/* Row Hints */
+.game-container > :nth-child(3) {
+  /* No special styles */
+}
+
 .grid {
   display: grid;
   gap: var(--gap-size);

src/components/GuidePanel.vue

@@ -35,8 +35,8 @@ const { t } = useI18n();
 
 <style scoped>
 .guide-panel {
-    background: rgba(0, 0, 0, 0.25);
-    border: 1px solid rgba(0, 242, 254, 0.3);
+    background: var(--panel-bg);
+    border: 1px solid var(--panel-border);
     border-radius: 12px;
     padding: 15px;
     margin-bottom: 20px;
@@ -46,6 +46,7 @@ const { t } = useI18n();
     flex-direction: column;
     align-items: center;
     backdrop-filter: blur(5px);
+    box-shadow: var(--panel-shadow);
 }
 
 .status-text {
@@ -53,7 +54,7 @@ const { t } = useI18n();
     text-align: center;
     margin-bottom: 10px;
     font-size: 0.9rem;
-    color: #ccc;
+    color: var(--text-muted);
     min-height: 20px;
     font-style: italic;
 }

src/components/NavBar.vue

@@ -2,7 +2,7 @@
 import { ref, computed, onMounted, onUnmounted, watch } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useI18n } from '@/composables/useI18n';
-import { Gamepad2, Palette, CircleHelp, Sun, Moon, Menu, X, ChevronDown, ChevronUp } from 'lucide-vue-next';
+import { Gamepad2, Palette, CircleHelp, Sun, Moon, Menu, X, ChevronDown, ChevronUp, Monitor } from 'lucide-vue-next';
 
 const store = usePuzzleStore();
 const { t, locale, setLocale, locales } = useI18n();
@@ -20,6 +20,7 @@ const searchTerm = ref('');
 const langToCountry = {
   en: 'gb',
   zh: 'cn',
+  'zh-hant': 'tw',
   hi: 'in',
   es: 'es',
   fr: 'fr',
@@ -61,7 +62,59 @@ const langToCountry = {
   gl: 'es-ga',
   cy: 'gb-wls',
   gd: 'gb-sct',
-  eu: 'es-pv'
+  eu: 'es-pv',
+  af: 'za',
+  am: 'et',
+  hy: 'am',
+  az: 'az',
+  my: 'mm',
+  km: 'kh',
+  ceb: 'ph',
+  fa: 'ir',
+  gu: 'in',
+  ht: 'ht',
+  he: 'il',
+  ig: 'ng',
+  ilo: 'ph',
+  id: 'id',
+  ja: 'jp',
+  jv: 'id',
+  kn: 'in',
+  kk: 'kz',
+  rw: 'rw',
+  rn: 'bi',
+  ko: 'kr',
+  ku: 'tr',
+  ckb: 'iq',
+  ky: 'kg',
+  lo: 'la',
+  ms: 'my',
+  mr: 'in',
+  mn: 'mn',
+  ne: 'np',
+  om: 'et',
+  ps: 'af',
+  pa: 'in',
+  so: 'so',
+  sw: 'tz',
+  tl: 'ph',
+  ta: 'in',
+  te: 'in',
+  th: 'th',
+  bo: 'cn',
+  ti: 'er',
+  uz: 'uz',
+  vi: 'vn',
+  wo: 'sn',
+  yo: 'ng',
+  'pt-br': 'br',
+  'pt-pt': 'pt',
+  'fr-ca': 'ca',
+  'nl-be': 'be',
+  'es-es': 'es',
+  'es-419': 'mx',
+  'zh-hant': 'tw',
+  'zh-hans': 'cn'
 };
 
 const getFlagClass = (code) => {
@@ -188,7 +241,7 @@ watch(isMobileMenuOpen, (val) => {
       <!-- Game Menu -->
       <div class="nav-dropdown">
         <button class="btn-neon nav-btn" @click.stop="toggleGameMenu">
-          <Gamepad2 :size="18" /> NEW GAME
+          <Gamepad2 :size="18" /> {{ t('nav.newGame') }}
         </button>
         <transition name="slide-fade">
           <div v-if="isGameOpen" class="dropdown-menu">
@@ -210,15 +263,18 @@ watch(isMobileMenuOpen, (val) => {
       <!-- Theme Menu -->
       <div class="nav-dropdown">
         <button class="btn-neon nav-btn" @click.stop="toggleThemeMenu">
-          <Palette :size="18" /> Theme
+          <Palette :size="18" /> {{ t('theme.label') }}
         </button>
         <transition name="slide-fade">
           <div v-if="isThemeOpen" class="dropdown-menu theme-menu">
+            <button class="dropdown-item" @click="setTheme('system')">
+              <Monitor :size="16" /> {{ t('theme.system') }}
+            </button>
             <button class="dropdown-item" @click="setTheme('light')">
-              <Sun :size="16" /> Light
+              <Sun :size="16" /> {{ t('theme.light') }}
             </button>
             <button class="dropdown-item" @click="setTheme('dark')">
-              <Moon :size="16" /> Dark
+              <Moon :size="16" /> {{ t('theme.dark') }}
             </button>
           </div>
         </transition>
@@ -226,7 +282,7 @@ watch(isMobileMenuOpen, (val) => {
 
       <!-- Guide Button -->
       <button class="btn-neon nav-btn" @click="toggleGuide">
-        <CircleHelp :size="18" /> GUIDE
+        <CircleHelp :size="18" /> {{ t('nav.guide') }}
       </button>
 
       <!-- Language Menu -->
@@ -280,7 +336,7 @@ watch(isMobileMenuOpen, (val) => {
                 <!-- Mobile Game Menu -->
                 <div class="mobile-group">
                     <button class="mobile-item-trigger" @click="toggleGameMenu">
-                        <span class="flex-center gap-10"><Gamepad2 :size="20" /> NEW GAME</span>
+                        <span class="flex-center gap-10"><Gamepad2 :size="20" /> {{ t('nav.newGame') }}</span>
                         <component :is="isGameOpen ? ChevronUp : ChevronDown" :size="16" />
                     </button>
                     <div v-if="isGameOpen" class="mobile-sub-menu">
@@ -301,15 +357,18 @@ watch(isMobileMenuOpen, (val) => {
                 <!-- Mobile Theme Menu -->
                 <div class="mobile-group">
                     <button class="mobile-item-trigger" @click="toggleThemeMenu">
-                        <span class="flex-center gap-10"><Palette :size="20" /> Theme</span>
+                        <span class="flex-center gap-10"><Palette :size="20" /> {{ t('theme.label') }}</span>
                         <component :is="isThemeOpen ? ChevronUp : ChevronDown" :size="16" />
                     </button>
                      <div v-if="isThemeOpen" class="mobile-sub-menu">
+                        <button class="mobile-sub-item" @click="setTheme('system')">
+                          <Monitor :size="16" /> {{ t('theme.system') }}
+                        </button>
                         <button class="mobile-sub-item" @click="setTheme('light')">
-                          <Sun :size="16" /> Light
+                          <Sun :size="16" /> {{ t('theme.light') }}
                         </button>
                         <button class="mobile-sub-item" @click="setTheme('dark')">
-                          <Moon :size="16" /> Dark
+                          <Moon :size="16" /> {{ t('theme.dark') }}
                         </button>
                      </div>
                 </div>
@@ -317,7 +376,7 @@ watch(isMobileMenuOpen, (val) => {
                 <!-- Mobile Guide -->
                 <div class="mobile-group">
                     <button class="mobile-item-trigger" @click="toggleGuide">
-                         <span class="flex-center gap-10"><CircleHelp :size="20" /> GUIDE</span>
+                         <span class="flex-center gap-10"><CircleHelp :size="20" /> {{ t('nav.guide') }}</span>
                     </button>
                 </div>
 
@@ -328,7 +387,7 @@ watch(isMobileMenuOpen, (val) => {
                              <span class="lang-flag-current mobile-flag">
                                 <span :class="getFlagClass(locale)"></span>
                              </span>
-                             Language
+                             {{ t('language.label') }}
                         </span>
                         <component :is="isLangOpen ? ChevronUp : ChevronDown" :size="16" />
                     </button>
@@ -549,14 +608,14 @@ watch(isMobileMenuOpen, (val) => {
     position: fixed;
     top: 0;
     left: 0;
-    width: 100vw;
+    width: 100%;
     height: 100vh;
     background: rgba(10, 10, 25, 0.98);
     backdrop-filter: blur(20px);
     z-index: 10000;
     display: flex;
     flex-direction: column;
-    padding: 20px;
+    padding: 0;
     overflow-y: auto;
 }
 
@@ -564,22 +623,24 @@ watch(isMobileMenuOpen, (val) => {
     display: flex;
     justify-content: space-between;
     align-items: center;
-    margin-bottom: 40px;
-    padding-bottom: 20px;
+    padding: 10px 20px;
     border-bottom: 1px solid rgba(0, 242, 254, 0.2);
+    flex-shrink: 0;
 }
 
 .mobile-title {
-    font-size: 1.5rem;
+    font-size: 1.8rem;
     color: var(--primary-neon);
     margin: 0;
-    letter-spacing: 2px;
+    letter-spacing: 3px;
+    font-weight: 300;
 }
 
 .mobile-menu-items {
     display: flex;
     flex-direction: column;
     gap: 15px;
+    padding: 20px;
 }
 
 .mobile-group {

src/components/ReloadPrompt.vue

@@ -0,0 +1,110 @@
+<script setup>
+import { useRegisterSW } from 'virtual:pwa-register/vue'
+import { useI18n } from '@/composables/useI18n'
+
+const { t } = useI18n()
+
+const {
+  offlineReady,
+  needRefresh,
+  updateServiceWorker,
+} = useRegisterSW()
+
+const close = async () => {
+  offlineReady.value = false
+  needRefresh.value = false
+}
+</script>
+
+<template>
+  <div
+    v-if="offlineReady || needRefresh"
+    class="pwa-toast"
+    role="alert"
+  >
+    <div class="message">
+      <span v-if="offlineReady">
+        {{ t('pwa.offlineReady') }}
+      </span>
+      <span v-else>
+        {{ t('pwa.newContent') }}
+      </span>
+    </div>
+    <div class="buttons">
+      <button v-if="needRefresh" class="btn-neon small" @click="updateServiceWorker()">
+        {{ t('pwa.reload') }}
+      </button>
+      <button class="close-btn" @click="close">
+        {{ t('pwa.close') }}
+      </button>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.pwa-toast {
+  position: fixed;
+  right: 0;
+  bottom: 60px; /* Above the footer */
+  margin: 16px;
+  padding: 15px;
+  border: 1px solid var(--banner-border);
+  background: var(--banner-bg);
+  border-radius: 12px;
+  z-index: 2000;
+  text-align: left;
+  box-shadow: var(--banner-shadow);
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  backdrop-filter: blur(10px);
+  color: var(--text-color);
+  max-width: 320px;
+  animation: slideIn 0.3s ease-out;
+}
+
+@keyframes slideIn {
+  from {
+    transform: translateY(20px);
+    opacity: 0;
+  }
+  to {
+    transform: translateY(0);
+    opacity: 1;
+  }
+}
+
+.message {
+  font-size: 0.95rem;
+  line-height: 1.4;
+}
+
+.buttons {
+  display: flex;
+  gap: 10px;
+  align-items: center;
+  justify-content: flex-end;
+  margin-top: 5px;
+}
+
+.close-btn {
+    background: transparent;
+    border: 1px solid var(--text-muted);
+    color: var(--text-muted);
+    padding: 6px 12px;
+    border-radius: 20px;
+    cursor: pointer;
+    font-size: 0.85rem;
+    transition: all 0.2s;
+}
+
+.close-btn:hover {
+    border-color: var(--text-color);
+    color: var(--text-color);
+}
+
+.btn-neon.small {
+    padding: 6px 16px;
+    font-size: 0.85rem;
+}
+</style>

src/components/StatusPanel.vue

@@ -3,7 +3,7 @@ import { computed } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useTimer } from '@/composables/useTimer';
 import { useI18n } from '@/composables/useI18n';
-import { RotateCcw, RefreshCw, Eye } from 'lucide-vue-next';
+import { RotateCcw, RefreshCw, Eye, Undo } from 'lucide-vue-next';
 
 const store = usePuzzleStore();
 const { formatTime } = useTimer();
@@ -45,7 +45,7 @@ const progressText = computed(() => `${store.progressPercentage.toFixed(3)}%`);
       </button>
       <div class="action-separator"></div>
       <button class="action-btn" @click="store.undo" :title="t('actions.undo')">
-        <RotateCcw :size="20" />
+        <Undo :size="20" />
       </button>
     </div>
   </div>

src/components/WinModal.vue

@@ -7,6 +7,7 @@ import { useTimer } from '@/composables/useTimer';
 import xIcon from '@/assets/brands/x.svg';
 import facebookIcon from '@/assets/brands/facebook.svg';
 import whatsappIcon from '@/assets/brands/whatsapp.svg';
+import { calculateDifficulty } from '@/utils/puzzleUtils';
 
 const store = usePuzzleStore();
 const { t } = useI18n();
@@ -88,8 +89,9 @@ const buildShareCanvas = () => {
   const padding = 28;
   const headerHeight = 64;
   const footerHeight = 28;
+  const infoHeight = 40; // New space for difficulty/guide info
   const width = boardSize + padding * 2;
-  const height = boardSize + padding * 2 + headerHeight + footerHeight;
+  const height = boardSize + padding * 2 + headerHeight + footerHeight + infoHeight;
   const scale = window.devicePixelRatio || 1;
   const canvas = document.createElement('canvas');
   canvas.width = width * scale;
@@ -109,6 +111,24 @@ const buildShareCanvas = () => {
   ctx.fillText(t('app.title'), padding, padding + 10);
   ctx.font = '600 16px "Segoe UI", sans-serif';
   ctx.fillText(`${t('win.time')} ${formattedTime.value}`, padding, padding + 34);
+  
+  // Difficulty & Density Info
+  const densityPercent = Math.round(store.currentDensity * 100);
+  const difficultyKey = calculateDifficulty(store.currentDensity);
+  let diffColor = '#33ff33';
+  if (difficultyKey === 'extreme') diffColor = '#ff3333';
+  else if (difficultyKey === 'hardest') diffColor = '#ff9933';
+  else if (difficultyKey === 'harder') diffColor = '#ffff33';
+  
+  const difficultyText = t(`difficulty.${difficultyKey}`);
+  ctx.font = '600 14px "Segoe UI", sans-serif';
+  
+  // Right aligned difficulty info
+  const diffLabel = `${t('win.difficulty')} ${difficultyText} (${densityPercent}%)`;
+  const diffWidth = ctx.measureText(diffLabel).width;
+  ctx.fillStyle = diffColor;
+  ctx.fillText(diffLabel, width - padding - diffWidth, padding + 34);
+
   const gridX = padding;
   const gridY = padding + headerHeight;
   ctx.fillStyle = 'rgba(255, 255, 255, 0.06)';
@@ -152,6 +172,15 @@ const buildShareCanvas = () => {
       }
     }
   }
+
+  // Guide Usage Info (Dirty Flag)
+  if (store.guideUsageCount > 0) {
+      ctx.fillStyle = '#ff4d4d';
+      ctx.font = '600 14px "Segoe UI", sans-serif';
+      const guideText = t('win.usedGuide', { count: store.guideUsageCount });
+      ctx.fillText(`⚠️ ${guideText}`, padding, height - padding - footerHeight + 10);
+  }
+
   ctx.fillStyle = 'rgba(255, 255, 255, 0.75)';
   ctx.font = '500 14px "Segoe UI", sans-serif';
   ctx.fillText(appUrl, padding, height - padding + 6);
@@ -183,7 +212,7 @@ const buildShareUrl = (target, text, url) => {
   const encodedText = encodeURIComponent(text);
   const encodedUrl = encodeURIComponent(url);
   if (target === 'x') {
-    return `https://twitter.com/intent/tweet?text=${encodedText}&url=${encodedUrl}`;
+    return `https://x.com/intent/tweet?text=${encodedText}&url=${encodedUrl}`;
   }
   if (target === 'facebook') {
     return `https://www.facebook.com/sharer/sharer.php?u=${encodedUrl}&quote=${encodedText}`;
@@ -197,29 +226,48 @@ const buildShareUrl = (target, text, url) => {
 const shareTo = async (target) => {
   if (shareInProgress.value) return;
   shareInProgress.value = true;
+  
+  const text = shareText.value;
+  const url = window.location.href;
+  const shareUrl = buildShareUrl(target, text, url);
+
   try {
-    const blob = await createShareBlob();
-    if (!blob) return;
-    const file = new File([blob], `nonogram-${store.size}x${store.size}.png`, { type: 'image/png' });
-    const text = shareText.value;
-    const url = window.location.href;
-    if (navigator.share && navigator.canShare && navigator.canShare({ files: [file] })) {
-      await navigator.share({
-        files: [file],
-        text,
-        title: t('app.title'),
-        url
-      });
-      return;
+    // Try native share first if available (supports images)
+    if (navigator.share && navigator.canShare) {
+      const blob = await createShareBlob();
+      if (blob) {
+        const file = new File([blob], `nonogram-${store.size}x${store.size}.png`, { type: 'image/png' });
+        if (navigator.canShare({ files: [file] })) {
+          await navigator.share({
+            files: [file],
+            text,
+            title: t('app.title'),
+            url
+          });
+          return;
+        }
+      }
     }
-    await downloadShareImage();
-    const shareUrl = buildShareUrl(target, text, url);
-    if (shareUrl) {
-      window.open(shareUrl, '_blank', 'noopener');
+  } catch (error) {
+    if (error.name === 'AbortError') {
+      return; // User cancelled native share, do nothing
     }
+    // Other errors -> fall through to fallback
   } finally {
     shareInProgress.value = false;
   }
+
+  // Fallback: Direct Link + Download
+  // Open window immediately if possible (though we awaited above, so it might be blocked, 
+  // but we can't do much about it if we want to try native share first).
+  // Ideally, for Desktop, navigator.share is undefined so we skip the await above.
+  
+  if (shareUrl) {
+    window.open(shareUrl, '_blank', 'noopener');
+  }
+  
+  // Trigger download as "screenshot support"
+  downloadShareImage();
 };
 
 onMounted(() => {
@@ -409,6 +457,7 @@ p {
   display: block;
 }
 
+
 .share-download {
   align-self: center;
   padding: 8px 18px;

src/composables/useNonogram.js

@@ -8,7 +8,7 @@ export function useNonogram() {
   const dragMode = ref(null); // 'fill', 'empty', 'cross'
   const startCellState = ref(null);
 
-  const startDrag = (r, c, isRightClick = false) => {
+  const startDrag = (r, c, isRightClick = false, force = false) => {
     if (store.isGameWon) return;
     
     isDragging.value = true;
@@ -16,9 +16,7 @@ export function useNonogram() {
     
     if (isRightClick) {
         // Right click logic
-        // If current is 1 (filled), do nothing usually? Or ignore?
-        // Standard: Toggle 0 <-> 2
-        if (current === 1) {
+        if (!force && current === 1) {
             dragMode.value = null; // invalid drag start
             return;
         }

src/composables/useSolver.js

@@ -24,6 +24,7 @@ export function useSolver() {
             return;
         }
         if (isProcessing.value) return;
+        store.markGuideUsed();
         ensureWorker();
         isProcessing.value = true;
 
@@ -77,6 +78,9 @@ export function useSolver() {
             } else if (type === 'done') {
                 isProcessing.value = false;
                 pause();
+            } else if (type === 'stuck') {
+                isProcessing.value = false;
+                pause();
             } else {
                 isProcessing.value = false;
             }

src/main.js

@@ -31,19 +31,3 @@ app.directive('cell-hover', vCellHover)
 
 app.mount('#app')
 
-if ('serviceWorker' in navigator) {
-  let refreshing = false
-  const triggerReload = () => {
-    if (refreshing) return
-    refreshing = true
-    window.location.reload()
-  }
-  navigator.serviceWorker.addEventListener('controllerchange', triggerReload)
-  const checkForUpdate = () => {
-    navigator.serviceWorker.getRegistration().then((registration) => registration?.update())
-  }
-  window.addEventListener('visibilitychange', () => {
-    if (document.visibilityState === 'visible') checkForUpdate()
-  })
-  window.addEventListener('focus', checkForUpdate)
-}

src/stores/puzzle.js

@@ -63,6 +63,10 @@ export const usePuzzleStore = defineStore('puzzle', () => {
   const solution = ref([]);
   const playerGrid = ref([]); // 0: empty, 1: filled, 2: cross
   const isGameWon = ref(false);
+  const hasUsedGuide = ref(false);
+  const guideUsageCount = ref(0);
+  const currentDifficulty = ref(null); // 'easy', 'medium', 'hard', 'custom' or object { density: 0.5 }
+  const currentDensity = ref(0);
   const size = ref(5);
   const startTime = ref(null);
   const elapsedTime = ref(0);
@@ -116,22 +120,30 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     
     resetGrid();
     isGameWon.value = false;
+    hasUsedGuide.value = false;
+    guideUsageCount.value = 0;
+    currentDensity.value = totalCellsToFill.value / (size.value * size.value);
     elapsedTime.value = 0;
     startTimer();
+    saveState();
   }
 
-  function initCustomGame(customSize) {
+  function initCustomGame(customSize, density = 0.5) {
     stopTimer();
     currentLevelId.value = 'custom';
     size.value = customSize;
     
     // Generate random grid
-    solution.value = generateRandomGrid(customSize);
+    solution.value = generateRandomGrid(customSize, density);
     
     resetGrid();
     isGameWon.value = false;
+    hasUsedGuide.value = false;
+    guideUsageCount.value = 0;
+    currentDensity.value = density;
     elapsedTime.value = 0;
     startTimer();
+    saveState();
   }
 
   function resetGrid() {
@@ -238,6 +250,9 @@ export const usePuzzleStore = defineStore('puzzle', () => {
         solution: solution.value,
         playerGrid: playerGrid.value,
         isGameWon: isGameWon.value,
+        hasUsedGuide: hasUsedGuide.value,
+        guideUsageCount: guideUsageCount.value,
+        currentDensity: currentDensity.value,
         elapsedTime: elapsedTime.value,
         moves: moves.value,
         history: history.value
@@ -255,6 +270,9 @@ export const usePuzzleStore = defineStore('puzzle', () => {
             solution.value = parsed.solution;
             playerGrid.value = parsed.playerGrid;
             isGameWon.value = parsed.isGameWon;
+            hasUsedGuide.value = parsed.hasUsedGuide || false;
+            guideUsageCount.value = parsed.guideUsageCount || 0;
+            currentDensity.value = parsed.currentDensity || 0;
             elapsedTime.value = parsed.elapsedTime || 0;
             moves.value = parsed.moves || 0;
             history.value = parsed.history || [];
@@ -271,44 +289,9 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     return false;
   }
   
-  function initGame(levelId = 'easy') {
-    // If init called without args and we have save, load it?
-    // User might want to start fresh if clicking buttons.
-    // Let's add explicit 'continue' logic or just auto-load on first run.
-    // For now, let's just stick to explicit init, but maybe load on mount if exists?
-    // The user didn't explicitly ask for "Continue", but "features from HTML".
-    // HTML usually auto-saves and loads.
-    
-    stopTimer();
-    currentLevelId.value = levelId;
-    
-    let puzzle = PUZZLES[levelId];
-    if (!puzzle) {
-        puzzle = PUZZLES['easy'];
-    }
-
-    size.value = puzzle.size;
-    solution.value = puzzle.grid;
-    
-    resetGrid();
-    isGameWon.value = false;
-    elapsedTime.value = 0;
-    startTimer();
-    saveState();
-  }
+  // Duplicate initGame removed
   
-  // Modify initCustomGame similarly
-  function initCustomGame(customSize) {
-    stopTimer();
-    currentLevelId.value = 'custom';
-    size.value = customSize;
-    solution.value = generateRandomGrid(customSize);
-    resetGrid();
-    isGameWon.value = false;
-    elapsedTime.value = 0;
-    startTimer();
-    saveState();
-  }
+  // Duplicate initCustomGame removed
 
   // Duplicate toggleCell/setCell removed
 
@@ -316,6 +299,8 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     if (currentLevelId.value === 'custom') {
         resetGrid();
         isGameWon.value = false;
+        hasUsedGuide.value = false;
+        guideUsageCount.value = 0;
         elapsedTime.value = 0;
         startTimer();
         saveState();
@@ -324,6 +309,13 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     }
   }
 
+  function markGuideUsed() {
+    if (isGameWon.value) return;
+    hasUsedGuide.value = true;
+    guideUsageCount.value++;
+    saveState();
+  }
+
   function closeWinModal() {
     if (!isGameWon.value) return;
     isGameWon.value = false;
@@ -347,7 +339,11 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     loadState, // expose loadState
     moves,
     undo,
-    closeWinModal
+    closeWinModal,
+    hasUsedGuide,
+    guideUsageCount,
+    currentDensity,
+    markGuideUsed
   };
 
 });

src/styles/main.css

@@ -1,3 +1,5 @@
+@import './scrollbar.css';
+
 :root {
   /* --- Glassmorphism Design System --- */
   --bg-gradient: linear-gradient(135deg, #43C6AC 0%, #191654 100%);
@@ -52,6 +54,9 @@
   --scroll-track: rgba(0, 0, 0, 0.1);
   --scroll-thumb: rgba(255, 255, 255, 0.2);
   --scroll-thumb-hover: var(--accent-cyan);
+  --fixed-bar-bg: rgba(0, 0, 0, 0.85);
+  --fixed-bar-thumb: rgba(0, 242, 255, 0.5);
+  --fixed-bar-thumb-hover: rgba(0, 242, 255, 0.8);
   
   /* Rozmiary */
   --cell-size: 30px;
@@ -113,6 +118,9 @@
   --scroll-track: rgba(15, 23, 42, 0.08);
   --scroll-thumb: rgba(15, 23, 42, 0.2);
   --scroll-thumb-hover: #0ea5e9;
+  --fixed-bar-bg: rgba(248, 250, 255, 0.95);
+  --fixed-bar-thumb: rgba(14, 165, 233, 0.5);
+  --fixed-bar-thumb-hover: rgba(14, 165, 233, 0.8);
 }
 
 * {
@@ -121,6 +129,11 @@
   -webkit-user-select: none;
 }
 
+html {
+  overflow-x: hidden;
+  width: 100%;
+}
+
 body {
   margin: 0;
   padding: 20px;

src/styles/scrollbar.css

@@ -0,0 +1,54 @@
+
+/* Fixed Scroll Bar */
+.fixed-scroll-bar {
+  position: fixed;
+  bottom: 15px;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 85%;
+  max-width: 400px;
+  height: 44px; /* Increased hit area */
+  background: transparent;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+  opacity: 0;
+  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
+  pointer-events: none;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
+  to { opacity: 1; transform: translateX(-50%) translateY(0); }
+}
+
+.fixed-scroll-track {
+  width: 100%;
+  height: 14px; /* Increased visual thickness */
+  background: rgba(15, 23, 42, 0.4);
+  backdrop-filter: blur(4px);
+  -webkit-backdrop-filter: blur(4px);
+  border-radius: 7px;
+  position: relative;
+  pointer-events: auto;
+  border: 1px solid rgba(255, 255, 255, 0.15);
+  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
+}
+
+.fixed-scroll-thumb {
+  position: absolute;
+  top: 0;
+  height: 100%;
+  background: var(--primary-accent);
+  border-radius: 7px;
+  cursor: grab;
+  box-shadow: 0 0 12px rgba(0, 242, 255, 0.5);
+  transition: background 0.2s ease, box-shadow 0.2s ease;
+}
+
+.fixed-scroll-thumb:active {
+  cursor: grabbing;
+  background: #fff;
+  box-shadow: 0 0 15px rgba(255, 255, 255, 0.6);
+}

src/utils/puzzleUtils.js

@@ -40,15 +40,36 @@ export function calculateHints(grid) {
     return { rowHints, colHints };
 }
 
-export function generateRandomGrid(size) {
+export function generateRandomGrid(size, density = 0.5) {
     const grid = [];
     for (let i = 0; i < size; i++) {
         const row = [];
         for (let j = 0; j < size; j++) {
-            // ~50% chance of being filled
-            row.push(Math.random() > 0.5 ? 1 : 0);
+            row.push(Math.random() < density ? 1 : 0);
         }
         grid.push(row);
     }
     return grid;
 }
+
+export function calculateDifficulty(density) {
+    // Shannon Entropy: H(x) = -x*log2(x) - (1-x)*log2(1-x)
+    // Normalized to 0-1 range (since max entropy at 0.5 is 1)
+    
+    // Avoid log(0)
+    if (density <= 0 || density >= 1) return 'easy';
+    
+    const entropy = -density * Math.log2(density) - (1 - density) * Math.log2(1 - density);
+    
+    // Thresholds based on entropy
+    // 0.5 density -> entropy 1.0 (Extreme)
+    // 0.4/0.6 density -> entropy ~0.97 (Extreme)
+    // 0.3/0.7 density -> entropy ~0.88 (Hardest)
+    // 0.2/0.8 density -> entropy ~0.72 (Harder)
+    // <0.2/>0.8 density -> entropy <0.72 (Easy)
+
+    if (entropy >= 0.96) return 'extreme'; // approx 38% - 62%
+    if (entropy >= 0.85) return 'hardest'; // approx 28% - 38% & 62% - 72%
+    if (entropy >= 0.65) return 'harder';  // approx 17% - 28% & 72% - 83%
+    return 'easy';
+}

src/utils/puzzleUtils.spec.js

@@ -0,0 +1,51 @@
+import { describe, it, expect } from 'vitest'
+import { calculateHints } from './puzzleUtils'
+
+describe('puzzleUtils', () => {
+  it('calculateHints correctly calculates hints for a simple grid', () => {
+    const grid = [
+      [1, 0, 1],
+      [1, 1, 1],
+      [0, 1, 0]
+    ]
+    // Row 0: 1, then space, then 1 -> [1, 1]
+    // Row 1: 1, 1, 1 -> [3]
+    // Row 2: space, 1, space -> [1]
+    
+    // Col 0: 1, 1, 0 -> [2]
+    // Col 1: 0, 1, 1 -> [2] ? Wait. Col 1 is 0, 1, 1. So space, 1, 1 -> [2].
+    // Let's trace col 1 manually:
+    // r0,c1 = 0
+    // r1,c1 = 1 -> count=1
+    // r2,c1 = 1 -> count=2
+    // end -> push 2.
+    // So Col 1 is [2].
+    
+    // Wait, my manual trace above for col 1:
+    // grid[0][1] is 0.
+    // grid[1][1] is 1.
+    // grid[2][1] is 1.
+    // Yes, [2].
+    
+    // Col 2: 1, 1, 0 -> [2].
+    
+    const expected = {
+      rowHints: [[1, 1], [3], [1]],
+      colHints: [[2], [2], [2]]
+    }
+    expect(calculateHints(grid)).toEqual(expected)
+  })
+
+  it('calculateHints handles empty rows/cols', () => {
+    const grid = [
+      [0, 0, 0],
+      [0, 0, 0],
+      [0, 0, 0]
+    ]
+    const expected = {
+      rowHints: [[0], [0], [0]],
+      colHints: [[0], [0], [0]]
+    }
+    expect(calculateHints(grid)).toEqual(expected)
+  })
+})

src/workers/solverWorker.js

@@ -5,7 +5,7 @@ const messages = {
     'worker.solved': 'Rozwiązane!',
     'worker.logicRow': 'Logika: Wiersz {row}, Kolumna {col} -> {state}',
     'worker.logicCol': 'Logika: Kolumna {col}, Wiersz {row} -> {state}',
-    'worker.guess': 'Zgadywanie: Wiersz {row}, Kolumna {col}',
+    'worker.stuck': 'Brak logicznego ruchu. Spróbuj zgadnąć lub cofnąć.',
     'worker.done': 'Koniec!',
     'worker.state.filled': 'Pełne',
     'worker.state.empty': 'Puste'
@@ -14,7 +14,7 @@ const messages = {
     'worker.solved': 'Solved!',
     'worker.logicRow': 'Logic: Row {row}, Column {col} -> {state}',
     'worker.logicCol': 'Logic: Column {col}, Row {row} -> {state}',
-    'worker.guess': 'Guessing: Row {row}, Column {col}',
+    'worker.stuck': 'No logical move found. Try guessing or undoing.',
     'worker.done': 'Done!',
     'worker.state.filled': 'Filled',
     'worker.state.empty': 'Empty'
@@ -236,29 +236,9 @@ const handleStep = (playerGrid, solution, locale) => {
     }
   }
 
-  for (let r = 0; r < size; r++) {
-    for (let c = 0; c < size; c++) {
-      const current = playerGrid[r][c];
-      const target = solution[r][c];
-      let isCorrect = false;
-      if (target === 1 && current === 1) isCorrect = true;
-      if (target === 0 && current === 2) isCorrect = true;
-      if (target === 0 && current === 0) isCorrect = false;
-      if (target === 1 && current === 0) isCorrect = false;
-      if (!isCorrect) {
-        const newState = target === 1 ? 1 : 2;
-        return {
-          type: 'move',
-          r,
-          c,
-          state: newState,
-          statusText: t(locale, 'worker.guess', { row: r + 1, col: c + 1 })
-        };
-      }
-    }
-  }
-
-  return { type: 'done', statusText: t(locale, 'worker.done') };
+  // Check for guess logic - we want to avoid this unless strictly necessary
+  // If no logic move found, return 'stuck' instead of cheating
+  return { type: 'stuck', statusText: t(locale, 'worker.stuck') };
 };
 
 self.onmessage = (event) => {

update_i18n_guide.cjs

@@ -0,0 +1,60 @@
+
+const fs = require('fs');
+
+const filePath = 'src/composables/useI18n.js';
+let content = fs.readFileSync(filePath, 'utf8');
+
+// 1. Add key to all language objects
+const lines = content.split('\n');
+const newLines = [];
+let insideLang = false;
+let currentLang = null;
+
+for (let i = 0; i < lines.length; i++) {
+    const line = lines[i];
+    
+    const langStartMatch = line.match(/^\s{2}(['"]?[\w-]+['"]?): \{/);
+    if (langStartMatch) {
+        insideLang = true;
+        currentLang = langStartMatch[1].replace(/['"]/g, '');
+    }
+    
+    if (insideLang && (line.trim() === '},' || line.trim() === '}')) {
+        let translation = 'GUIDE';
+        if (currentLang === 'pl') translation = 'PRZEWODNIK';
+        if (currentLang === 'es') translation = 'GUÍA';
+        if (currentLang === 'fr') translation = 'GUIDE';
+        if (currentLang === 'de') translation = 'ANLEITUNG';
+        if (currentLang === 'it') translation = 'GUIDA';
+        if (currentLang === 'pt' || currentLang === 'pt-br') translation = 'GUIA';
+        if (currentLang === 'ru') translation = 'РУКОВОДСТВО';
+        if (currentLang === 'zh') translation = '指南';
+        
+        // Ensure previous line has comma
+        if (newLines.length > 0) {
+            const lastLine = newLines[newLines.length - 1];
+            if (!lastLine.trim().endsWith(',') && !lastLine.trim().endsWith('{')) {
+                newLines[newLines.length - 1] = lastLine + ',';
+            }
+        }
+        
+        newLines.push(`    'nav.guide': '${translation}'`);
+        insideLang = false;
+        currentLang = null;
+    }
+    
+    newLines.push(line);
+}
+
+content = newLines.join('\n');
+
+// 2. Add to requiredKeys
+// Find "const requiredKeys = ["
+// We know it ends with 'nav.newGame' now.
+content = content.replace(
+    "'nav.newGame'",
+    "'nav.newGame','nav.guide'"
+);
+
+fs.writeFileSync(filePath, content);
+console.log('Updated useI18n.js with nav.guide');

vite.config.js

@@ -4,11 +4,18 @@ import { VitePWA } from 'vite-plugin-pwa'
 import path from 'path'
 
 export default defineConfig({
+  define: {
+    '__APP_VERSION__': JSON.stringify(process.env.npm_package_version)
+  },
   plugins: [
     vue(),
     VitePWA({
-      registerType: 'autoUpdate',
+      registerType: 'prompt',
       injectRegister: 'auto',
+      workbox: {
+        cleanupOutdatedCaches: true,
+        globPatterns: ['**/*.{js,css,html,ico,png,svg,json,vue,txt,woff2}']
+      },
       devOptions: {
         enabled: true
       },

vitest.config.js

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vitest/config'
+import vue from '@vitejs/plugin-vue'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [vue()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src')
+    }
+  }
+})