Fix Undo icon and improve mobile UX

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/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;
@@ -74,6 +162,7 @@ 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 +170,7 @@ onMounted(() => {
 
 onUnmounted(() => {
   window.removeEventListener('resize', computeCellSize);
+  window.removeEventListener('resize', checkScroll);
   window.removeEventListener('mouseup', handleGlobalMouseUp);
   window.removeEventListener('pointerup', handleGlobalPointerUp);
   window.removeEventListener('touchend', handleGlobalPointerUp);
@@ -89,11 +179,12 @@ 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 +222,30 @@ 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 */
+}
+.game-board-wrapper::-webkit-scrollbar {
+  display: none;
 }
 
 .game-container {
@@ -145,17 +253,24 @@ 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/NavBar.vue

@@ -607,14 +607,14 @@ 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;
 }
 
@@ -622,22 +622,24 @@ 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/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>