.menu-bar{position:fixed;display:flex;top:0;left:0;right:0;align-items:center;justify-content:flex-start;width:100%;gap:clamp(.5rem,2vw,.5rem);box-sizing:border-box;box-shadow:0 2px 5px #0000001a;z-index:9999;background-color:var(--header-bg);height:var(--header-inner-height, 60px)}.game-title{text-align:left;font-size:clamp(1rem,2vw,1.8rem);margin:0;padding:0;line-height:1;white-space:nowrap}.mobile-only-counts-row,.mobile-only-score{display:none}.divider{border:none;border-top:.6px solid var(--divider-color);width:100vw;margin:0;padding:0}.wrapper{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;font-size:medium;width:100%;height:100dvh;overflow-y:auto;overflow-x:hidden;gap:.1rem;padding:6px;margin-bottom:0;color:var(--text-color);box-sizing:border-box}.sudoku-app{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;font-family:Arial,sans-serif;padding-top:5rem;padding-bottom:1rem;max-width:100%;box-sizing:border-box}html,body{margin:0;padding:0;height:100%;overflow:hidden;font-family:sans-serif}.instructions-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;justify-content:center;align-items:center;z-index:999;padding:1rem;flex-direction:column;box-sizing:border-box}.instructions-content{position:relative;background:var(--modal-bg);padding:.6rem;border-radius:1.5%;padding:1rem;width:100%;max-width:500px;max-height:75vh;overflow-y:auto;box-shadow:0 6px 18px #00000040;animation:fadeInScale .25s ease;z-index:999;box-sizing:border-box}.instructions-content h3{text-align:center}.instructions-content ol{text-align:left}.instruct-close-btn{position:absolute;top:8px;right:8px;width:24px;height:24px;background:none;border:none;cursor:pointer;padding:0;display:flex;align-items:center;justify-content:center;z-index:1000}.instruct-close-btn:before,.instruct-close-btn:after{content:"";position:absolute;width:2px;height:24px;background-color:var(--text-color)}.instruct-close-btn:before{transform:rotate(45deg)}.instruct-close-btn:after{transform:rotate(-45deg)}@keyframes fadeInScale{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.loading-overlay{position:fixed;top:0;left:0;width:100%;background:transparent;display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:9999}.loading-bar{width:0%;height:.5rem;background:#29d;transition:width .3s ease;border-radius:4px;overflow:hidden;margin-bottom:1rem}.loading-progress{width:100%;height:100%;background:linear-gradient(90deg,#4cafef,#2196f3,#4cafef);animation:progressMove 1.5s infinite linear}@keyframes progressMove{0%{transform:translate(-100%)}to{transform:translate(100%)}}.close-btn:hover{background:#555}.logo-title-container{display:flex;align-items:center;width:100%;justify-content:flex-start;height:auto;margin:0;gap:clamp(.8rem,2vw,2rem);padding:0;box-sizing:border-box}.logo{max-height:clamp(1.8rem,2vw,2.5rem);aspect-ratio:1 / 1;border-radius:35%;cursor:pointer;flex-shrink:0;padding-right:0!important;padding-left:clamp(.9rem,2vw,3rem)!important;margin:0;transition:transform .2s ease,filter .2s ease}.difficulty-dropdown{margin-right:.5rem;background-color:var(--button-bg);color:var(--text-color);border:1px solid var(--button-border)}.theme-selector-container{position:relative;display:flex;align-items:center}.theme-icon-button{background:transparent;border:none;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0;color:var(--text-color);transition:all .2s ease}.theme-icon-button:hover{transform:scale(1.1)}.theme-icon-img{width:24px;height:24px;transition:transform .2s ease}.theme-dropdown-menu{position:absolute;top:100%;left:0;margin-top:8px;background:var(--modal-bg);border:1px solid var(--divider-color);border-radius:8px;box-shadow:0 4px 12px #00000026;z-index:10000;min-width:100px;display:flex;flex-direction:column;padding:4px}.theme-menu-item{background:transparent;border:none;border-radius:4px;padding:8px 12px;text-align:left;cursor:pointer;font-size:.9rem;color:var(--text-color);transition:background .2s ease;width:100%}.theme-menu-item:hover{background:var(--button-bg)}.theme-menu-item.active{background:var(--num-pad-bg);color:#fff}.how-to-play-btn{z-index:1000;background:transparent;border:none;border-radius:50%;padding:0;cursor:pointer;margin:.5rem;color:var(--text-color);display:flex;align-items:center;justify-content:center;transition:transform .2s ease}.how-to-play-btn:hover{transform:scale(1.1)}.how-to-icon-img{width:24px;height:24px}.tooltip-container{position:relative;display:inline-flex;align-items:center;justify-content:center}.tooltip-bubble{position:absolute;top:100%;left:50%;transform:translate(-50%);margin-top:8px;background-color:var(--text-color);color:var(--bg-color);padding:4px 8px;border-radius:4px;font-size:.75rem;white-space:nowrap;z-index:100000;pointer-events:none;box-shadow:0 2px 8px #0003;animation:fadeIn .15s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translate(-50%,-4px)}to{opacity:1;transform:translate(-50%)}}.pc-tooltip-btn{position:relative;display:inline-block;cursor:pointer;color:transparent;padding:0;margin:1rem;justify-content:center;align-items:flex-end}.ic-pc{width:clamp(24px,32px,48px);height:auto;margin:0;background:transparent}.tooltip-text-pc{white-space:nowrap;visibility:hidden;width:130px;background-color:var(--text-color);color:var(--bg-color);text-align:center;font-size:small;top:100%;right:0;max-lines:1x;border-radius:6px;padding:5px;margin:5px;position:absolute;z-index:99991}.pc-tooltip:hover .tooltip-text-pc{visibility:visible}html,body{height:100%;margin:0;display:flex;justify-content:center;align-items:center;padding:0;font-family:Arial,sans-serif;-webkit-tap-highlight-color:transparent}.game-container{display:flex;flex-direction:row;align-items:center;justify-content:center;gap:1.5rem;max-width:100%;width:100%;margin:0 auto}.board-section{display:flex;flex-direction:column;align-items:center}.sudoku-board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);aspect-ratio:1 / 1;width:100%;max-width:90vw;margin:10px auto;border:2px solid var(--text-color);background:var(--board-bg)}.board-row{display:contents}.cell{width:3rem;height:3rem;border:1px solid var(--cell-border);display:flex;justify-content:center;align-items:center;font-size:clamp(14px,3.5vw,20px);font-weight:700;cursor:pointer;position:relative;color:var(--cell-text)}.cell.cross-highlight{background-color:var(--cell-highlight-bg)}.cell.selected{background-color:var(--cell-selected-bg)!important;box-shadow:0 0 0 2px #1e90ff inset;z-index:2}.cell.highlighted-conflict{background-color:#f003}.cell.bottom-border{border-bottom:2px solid #333}.cell.right-border{border-right:2px solid #333}.cell.initial.cross-highlight{background-color:#87ceeb4d}.cell.initial{background-color:var(--cell-initial-bg);color:var(--cell-text);cursor:default}.cell.correct{color:var(--cell-correct-text)}.cell.wrong{color:var(--cell-wrong-text)}.highlighted-same{background-color:#fff9c4!important}.highlighted-row-col{background-color:#c8e6ff4d!important}.number-highlight{background-color:#c8e6ff4d}.sudoku-board .cell.number-highlight{background-color:#add8e64d!important;transition:background-color .12s ease}.highlighted-box{background-color:#ffe6c84d!important}.highlighted-conflict{background-color:#ffcdd2!important}.bottom-border{border-bottom:2px solid #333!important}.right-border{border-right:2px solid #333!important}.notes-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:100%;height:100%;position:absolute;top:0;left:0}.note{font-size:clamp(10px,2vw,16px);display:flex;justify-content:center;align-items:center;color:var(--cell-note-text)}.note.visible{visibility:visible}.control-panel{display:flex;flex-direction:column;gap:16px;margin-left:20px;width:205px}.score-widget{display:flex;flex-direction:column;background-color:var(--score-bg);padding:8px 15px;border-radius:8px;border:1px solid var(--divider-color);margin-bottom:4px;box-shadow:0 2px 4px #0000000d}.score-main{display:flex;justify-content:space-between;align-items:center;width:100%}.score-refresh-notice{font-size:9px;opacity:.6;color:var(--score-label);margin-top:2px;text-align:right;width:100%;font-style:italic}.score-main-mobile{display:flex;align-items:center;gap:8px}.score-label{font-size:14px;font-weight:600;color:var(--score-label);text-transform:uppercase;letter-spacing:.5px}.score-value{font-size:20px;font-weight:700;color:var(--score-value);font-family:Courier New,Courier,monospace}.number-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;width:100%}.number-pad button{position:relative;width:100%;aspect-ratio:1 / 1;border:none;background-color:var(--num-pad-bg);color:#fff;border-radius:4px;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.number-value{font-size:24px;font-weight:700}.count-badge{position:absolute;bottom:4px;right:4px;font-size:11px;background-color:#fff3;padding:1px 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button.completed{opacity:.5;text-decoration:line-through}.action-buttons{display:flex;justify-content:space-between;width:100%;align-items:center;margin-top:4px}.action-buttons button{display:flex;align-items:center;position:relative;width:48px;height:48px;font-size:14px;justify-content:center;border:solid 1.5px var(--num-pad-bg);background-color:transparent;color:var(--text-color);border-radius:50%;cursor:pointer}.action-buttons button:hover{background:var(--button-bg);transform:translateY(-1px)}.action-buttons button.active{background-color:var(--num-pad-bg);color:#fff;transform:scale(.95);box-shadow:inset 0 2px 4px #0003}.action-buttons button:disabled{background-color:#95a5a6;cursor:not-allowed}.btn-pencil:before{content:"✏️";font-size:18px}.btn-eraser:before{content:"⌫";font-size:18px;position:static;width:auto;height:auto;border:none;background:none;border-radius:0;box-shadow:none;transform:none}.hint-badge{position:absolute;top:-8px;right:4px;background:#2980b9;font-size:clamp(9px,1.5vw,12px);line-height:1;font-weight:700;padding:.15rem .3rem;border-radius:9999px;box-shadow:0 1px 3px #00000026;pointer-events:none;background-color:var(--num-pad-bg);color:#fff}.btn-hint:before{content:"💡";font-size:18px}.ic-hint{width:48px;height:100px;margin-left:2.4rem;margin-top:1.2rem;justify-content:center;align-items:center;color:#ff0}.btn-reset:before{content:"🔄️";font-size:18px}.btn-eraser,.btn-hint,.btn-pencil,.btn-reset{position:relative;width:24px;height:24px;display:flex;align-items:center;justify-content:center}.game-info{display:flex;justify-content:space-around;align-content:center;width:100%;height:auto;gap:.3rem;margin-bottom:.2rem;font-size:clamp(1rem,2vw,1.1rem)}.new-game-btn{display:flex;justify-content:center;align-items:center;text-align:center;width:100%;padding:8px 16px;margin:0 0 .25rem;border-radius:50px;border:1.5px solid #2980b9;background-color:transparent;color:#2980b9;font-weight:600;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1)}.new-game-btn:hover{background-color:#fffefe;color:#2980b9;transform:translateY(-1px);box-shadow:0 4px 12px #2980b933}.new-game-btn:active{transform:scale(.98)}.info-item{display:flex;align-items:center;gap:8px;font-weight:700;font-size:clamp(1rem,3vw,1.3rem);color:var(--text-color)}.timer-icon-svg{color:var(--text-color);width:1.2em;height:1.2em}.mistake-icon-svg{color:#e74c3c;width:1.1em;height:1.1em}.hint-icon{width:24px;height:24px;position:relative}.hint-icon:before{content:"";position:absolute;width:12px;height:16px;background:#3498db;border-radius:4px 4px 8px 8px;top:4px;left:6px}.hint-icon:after{content:"⚡";position:absolute;font-size:12px;top:8px;left:8px;color:gold}.hint-count{position:absolute;top:-6px;right:-6px;width:20px;height:20px;background:#3498db;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;border:2px solid white}.hint-count.ad{background:#e67e22;font-size:10px;content:"Ad"}.hint-count.ad:after{content:"Ad"}.game-info{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:clamp(16px,18px,20px)}.game-controls{margin:1rem 0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(4px,2vw,10px);font-size:clamp(12px,4vw,18px)}.controls-row{display:flex;margin-right:clamp(1rem,2vw,2rem);align-items:center;height:clamp(14px,2vw,16px);width:fit-content;gap:clamp(6px,8px,12px)}.game-over-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background-color:#000000b3;display:flex;justify-content:center;align-items:center;z-index:100}.game-over-content{background-color:#fff;padding:clamp(20px,2vw,30px);border-radius:10px;box-shadow:inset;text-align:center;border-width:100px}.game-over-message{font-size:28px;font-weight:700;margin-bottom:16px;top:50%;right:50%;bottom:50%;left:50%;translate:-50px -50% -50%;color:#2c3e50}.play-again{padding:10px 20px;font-size:18px;background-color:#3498db;color:#fff;border:none;border-radius:5px;cursor:pointer}.play-again:hover{background-color:#2980b9}select,button{padding:8px 16px;font-size:16px;border-radius:4px;border:1px solid #ccc}.site-footer{width:100%;padding:.8rem 0;display:flex;flex-direction:row;justify-content:center;align-items:center;gap:1.5rem;background-color:#f8f9fa;color:#6c757d;font-size:.85rem;border-top:1px solid #dee2e6;margin-top:auto;z-index:10;flex-wrap:wrap}.site-footer p{margin:0}.footer-links{display:flex;gap:1rem}.footer-btn{background:none;border:none;color:#2980b9;cursor:pointer;padding:0;font-size:.85rem;text-decoration:underline;transition:color .2s ease}.footer-btn:hover{color:#1a5a8a;text-decoration:none}@media (max-width: 768px){:root{--vh: 100%;--header-inner-height: 56px;--score-color: #2980b9}.sudoku-app{padding-top:3.5rem}.game-controls{display:flex;margin-top:3rem;flex-grow:1;flex-basis:0}.game-controls:last-child{flex-grow:2}html,body{height:100%;overflow-x:hidden;overflow-y:hidden;touch-action:none}.game-container{flex-direction:column;align-items:center;justify-content:flex-start;gap:.1rem;width:100%;max-width:700px;padding-top:evn(safe-area-inset-top,1rem)}.board-section{gap:clamp(4px,6px,8px)}.wrapper{overflow-y:auto;width:100%}.game-title{display:flex;font-size:1.1rem;margin:0}.logo{margin:0;height:.5rem;padding:0}.how-to-play-btn{align-items:center;margin:0}.menu-bar{position:fixed;top:0;display:flex;padding-left:0rem;align-items:center;height:3rem;text-align:justify;padding-bottom:env(safe-area-inset-top);padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transform:none!important;will-change:auto}.logo-title-container{display:flex;align-items:center;width:100%;justify-content:flex-start;height:auto;overflow:hidden;margin:.1% .1% .1% 0;padding:0;box-sizing:border-box}.game-info{display:flex;align-items:center;justify-content:space-around;margin:.1rem}.info-icon{width:24px;height:24px}.control-panel{width:100%;margin-left:0;align-items:center;margin-top:.2rem;display:flex;justify-content:flex-end;z-index:10;flex-direction:column;gap:.1rem}.sudoku-board{color:#2c8fd1;width:90vw;height:90vw;aspect-ratio:1 / 1;justify-content:center;max-width:700px;max-height:700px;margin-bottom:.2rem auto}.number-pad{display:grid;grid-template-columns:repeat(auto-fit,minmax(8px,1fr));grid-auto-rows:50px;gap:clamp(.05rem,2vw,.5rem);width:100%;height:auto;max-width:100%;justify-items:center;align-content:center;margin:0 auto;padding-bottom:env(safe-area-inset-bottom)}.number-pad button{width:2rem;max-width:70px;height:2.8rem;aspect-ratio:1 / 1;align-self:center;justify-content:center;font-size:clamp(20px,4vw,18px);padding:0;margin:0 auto}.counts-and-actionbtn{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%;margin-bottom:.3rem}.desktop-only-score{display:none!important}.title-score-wrapper{display:flex;flex-direction:column;align-items:flex-start}.mobile-only-score{display:flex;align-items:center;gap:6px;margin-top:-4px}.mobile-score-label{font-size:.7rem;color:var(--text-color);opacity:.8}.mobile-score-value{font-size:.9rem;font-weight:700;color:var(--score-color)}.horizontal-counts{display:flex;justify-content:center;align-self:center;gap:clamp(.2rem,2vw,1rem);margin-bottom:.5rem;margin-left:1.2rem}.count-item .number{display:none;font-weight:700;font-size:clamp(20px,4vw,24px)}.count-item .remaining{display:flex;width:2rem;max-width:80px;text-align:center;justify-content:center;gap:clamp(.3rem,.4rem,.5rem);height:auto;font-size:clamp(24px,4vw,26px)}.action-buttons{display:flex;width:100%;height:auto;align-items:center;justify-content:center;gap:12px;margin-top:.1rem;margin-bottom:.4rem}.desktop-only-count{display:none!important}.mobile-only-counts-row{display:flex;justify-content:center;gap:clamp(.2rem,2.5vw,.4rem);width:100%;margin-top:.1rem;margin-bottom:.5rem;max-width:90vw}.mobile-count-item{flex:1;text-align:center;font-size:1.2rem;font-weight:700;color:var(--text-color);opacity:.9;min-width:0;font-family:Courier New,Courier,monospace;display:flex;justify-content:center;align-items:center}.mobile-count-item.completed{opacity:.2;text-decoration:line-through}.action-buttons button{display:flex;width:3rem;height:auto;aspect-ratio:1/1;font-size:clamp(12px,4vw,16px);align-items:center;background:transparent;justify-content:center}.action-buttons button .btn-pencil,.action-buttons button .btn-eraser,.action-buttons button .btn-hint,.action-buttons button .btn-reset{width:20px;height:20px}.cell{font-size:clamp(14px,4vw,16px);width:auto;height:auto;box-sizing:border-box}.cell.bottom-border{border-bottom:2px solid #333}.cell.right-border{border-right:2px solid #333}}@media (max-width: 410px){.sudoku-app{padding-top:3.2rem}.controls-row{display:flex;justify-content:space-evenly;margin:.1rem;align-items:center}.new-game-btn{display:flex;margin:0;font-size:clamp(12px,14px,16px);width:auto;max-lines:1;border-radius:50px;height:30px}.difficulty-dropdown{font-size:12px;padding:clamp(.15rem,1.5vw,.2rem);width:fit-content;height:auto;align-items:center;max-lines:1x}.wrapper{overflow-y:auto}.menu-bar{height:2.4rem}.site-footer{flex-direction:column;gap:.5rem;padding:1rem 0}.logo{height:.4rem;width:auto;padding:0;margin:0}.game-title{font-size:medium}.number-pad{display:flex;max-width:70px;margin-left:auto;margin-right:auto;margin-top:.08rem;justify-content:center;align-self:center;gap:clamp(.2rem,2vw,.5rem);padding-bottom:env(safe-area-inset-bottom)}.number-pad button{height:2rem;width:1.5rem}.count-item{max-width:80px;gap:3px}.count-item .remaining{width:.5rem;text-align:center;justify-content:center;margin:0}.action-buttons button{height:auto}}@supports (-webkit-touch-callout: none){@media only screen and (min-device-width:320px) and (max-device-width:1024p) and (-webkit-min-device-pixel-ratio: 2){.sudoku-app{min-height:100dvh}.wrapper{height:calc(var(--vh, 1vh) * 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