:root{--primary-color: #4a90e2;--secondary-color: #f39c12;--success-color: #27ae60;--danger-color: #e74c3c;--background-color: #f8f9fa;--surface-color: #ffffff;--text-color: #2c3e50;--border-color: #dee2e6;--region-border-color: #495057;--shadow: 0 .125rem .25rem rgba(0, 0, 0, .075);--border-radius: .5rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;height:100vh;height:100dvh;overflow:hidden}#app{height:100vh;height:100dvh;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0);padding-bottom:env(safe-area-inset-bottom,0);padding-left:env(safe-area-inset-left,0);padding-right:env(safe-area-inset-right,0)}.btn{padding:.75rem 1.5rem;border:none;border-radius:var(--border-radius);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;position:relative;overflow:hidden;white-space:nowrap;height:2.75rem}.btn:disabled{cursor:not-allowed;opacity:.7}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:#357abd;transform:translateY(-.125rem)}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-secondary:hover{background-color:#e67e22;transform:translateY(-.125rem)}.btn.loading{pointer-events:auto}.btn.loading .btn-text{opacity:1}.btn.loading .loader{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:1.5rem;height:1.5rem;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:translate(-50%,-50%) rotate(0)}to{transform:translate(-50%,-50%) rotate(360deg)}}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal.hidden{display:none}.modal-content{background-color:var(--surface-color);padding:2rem;border-radius:var(--border-radius);text-align:center;max-width:25rem;width:90%;margin:1rem}.modal-content h2{color:var(--success-color);margin-bottom:1rem}.modal-content p{margin-bottom:1rem}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-.25rem)}75%{transform:translate(.25rem)}}@keyframes conflict-pulse-bg{0%,to{background-color:#ff572226}50%{background-color:#ff572240}}#app{height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden}.game-header{flex-shrink:0;z-index:100;padding-top:max(1rem,env(safe-area-inset-top,0));padding-left:max(1rem,env(safe-area-inset-left,0));padding-right:max(1rem,env(safe-area-inset-right,0))}.game-main{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none;-ms-overflow-style:none}.game-main::-webkit-scrollbar{display:none}.mobile-number-panel{position:fixed;bottom:0;left:0;right:0;z-index:1000;flex-shrink:0;padding-bottom:env(safe-area-inset-bottom,0)}@supports (padding: max(0px)){.game-header{padding-top:max(1rem,env(safe-area-inset-top,0))}.mobile-number-panel{padding-bottom:max(.5rem,env(safe-area-inset-bottom,0))}}@media (max-width: 767.98px){.game-main{padding-bottom:calc(4rem + env(safe-area-inset-bottom,0))}.game-board-container{margin-bottom:calc(1.25rem + env(safe-area-inset-bottom,0))}}@media screen and (max-width: 767.98px){input,select,textarea{font-size:16px!important}}@media (max-width: 767.98px){.cell,.btn,.number-btn,.mode-toggle-btn{-webkit-tap-highlight-color:transparent;touch-action:manipulation}}@media (max-width: 320px){.game-header{padding:.75rem}.game-main{padding:.75rem;padding-bottom:calc(3.5rem + env(safe-area-inset-bottom,0))}}@media (max-width: 767.98px) and (orientation: landscape){.game-header{padding:.5rem 1rem}.game-header h1{font-size:1.25rem}.game-main{padding:.75rem;padding-bottom:calc(3rem + env(safe-area-inset-bottom,0))}.mobile-number-panel .panel-buttons{gap:.25rem}.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:2.5rem;font-size:1rem}}@media (display-mode: standalone){.game-header{padding-top:max(1rem,env(safe-area-inset-top,0))}.mobile-number-panel{padding-bottom:max(.5rem,env(safe-area-inset-bottom,0))}}@media (prefers-color-scheme: dark){:root{--background-color: #1a1a1a;--surface-color: #2d2d2d;--text-color: #ffffff;--border-color: #404040}}.game-header{background-color:var(--surface-color);padding:1rem 2rem;box-shadow:var(--shadow);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;position:relative;flex-shrink:0;z-index:100}.game-header h1{color:var(--primary-color);font-size:2rem;font-weight:700;margin:0}.game-header .title-section{display:flex;align-items:center;gap:1rem}.game-controls{display:flex;gap:.75rem;flex-wrap:wrap;align-items:center}.size-selector{display:flex;gap:.5rem;align-items:center;background-color:var(--background-color);padding:.5rem;border-radius:var(--border-radius);border:1px solid var(--border-color)}.size-selector label{font-size:.875rem;font-weight:600;color:var(--text-color)}.size-selector select{padding:.375rem .5rem;border:1px solid var(--border-color);border-radius:.25rem;font-size:.875rem;background-color:var(--surface-color);color:var(--text-color);cursor:pointer}.size-selector select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 .125rem #4a90e240}#generate-btn{min-width:10rem}#generate-btn .btn-text{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;line-height:1;font-weight:700}@media (max-width: 767.98px){.game-header{padding:1rem;flex-direction:column;text-align:center;align-items:stretch;gap:.75rem}.game-header .title-section{justify-content:center;gap:.75rem}.game-header h1{font-size:1.5rem}.game-controls{display:flex;flex-direction:column;align-items:stretch;gap:.75rem}.size-selector{width:100%;display:grid;grid-template-columns:1fr 1fr 1fr;gap:.5rem;padding:.5rem}.size-selector .selector-row{display:flex;flex-direction:column;gap:.25rem}.size-selector label{font-size:.875rem;white-space:nowrap}.size-selector select{width:100%;font-size:.875rem;min-width:0}.size-selector .buttons-row{grid-column:1 / -1;display:flex;gap:.5rem;width:100%}#generate-btn,#check-btn{flex:1;min-width:0;height:2.75rem}}@media (min-width: 768px){.game-header{padding:1rem 2rem}.game-header h1{font-size:2rem}.size-selector{display:flex;flex-direction:row;align-items:center;gap:1rem;flex-wrap:wrap}.size-selector .selector-row{display:flex;align-items:center;gap:.5rem}.size-selector label{font-size:.875rem;white-space:nowrap}.size-selector select{min-width:4rem}.size-selector .buttons-row{display:flex;gap:.75rem;align-items:center}#generate-btn{min-width:10rem}#check-btn{min-width:auto}}.game-main{flex:1;padding:2rem;max-width:1200px;margin:0 auto;width:100%;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch}.game-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding:1rem;background-color:var(--surface-color);border-radius:var(--border-radius);box-shadow:var(--shadow);flex-wrap:wrap;gap:1rem}.game-board-container{display:flex;justify-content:center;align-items:center;margin-bottom:2rem;min-height:0}.game-board{display:inline-grid;background-color:var(--region-border-color);padding:1.125rem;border-radius:var(--border-radius);box-shadow:var(--shadow);margin-bottom:2rem;border:1px solid var(--region-border-color);gap:0;margin-left:auto;margin-right:auto}.game-board{background-color:var(--region-border-color);border:2px solid var(--region-border-color)}.cell{background-color:var(--surface-color);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.5rem;cursor:pointer;transition:all .2s ease;position:relative;margin:0;box-sizing:border-box}.cell-text{display:block;width:100%;height:100%;display:flex;align-items:center;justify-content:center}.cell:hover{background-color:#e3f2fd}.cell:focus{background-color:#e3f2fd;z-index:1}.cell.filled{background-color:var(--primary-color);color:#fff;font-weight:800}.cell.error{background-color:var(--danger-color)!important;color:#fff!important;font-weight:800}.cell.error:hover{background-color:#c82333!important;color:#fff!important}.cell.error:focus{background-color:#c82333!important;color:#fff!important;z-index:10!important}.cell.hint{background-color:var(--success-color);color:#fff;font-weight:800}.cell.initial{background-color:#e9ecef;color:var(--text-color);cursor:pointer;font-weight:800;border:2px solid var(--border-color)}.cell.initial:focus{outline:none;box-shadow:none}.cell[data-region]{border:1px solid var(--border-color)}.cell[style*="width: 4.5rem"]{font-size:2.25rem}.cell[style*="width: 3.75rem"]{font-size:1.875rem}.cell[style*="width: 3rem"]{font-size:1.5rem}.cell[style*="width: 2.7rem"]{font-size:1.3125rem}.draft-number{position:absolute;font-size:.7rem;color:#666;font-weight:400;pointer-events:none;z-index:2;line-height:1}.draft-number.error{color:var(--danger-color)!important;font-weight:500}@media (min-width: 768px){.draft-number{font-size:.8rem}}@media (min-width: 1024px){.draft-number{font-size:.9rem}}@media (min-width: 1200px){.draft-number{font-size:1rem}}.cell.current-cell-highlight .cell-text{color:#ffeb3b!important;-webkit-text-stroke:1.5px #000!important;font-weight:900}.cell.error.current-cell-highlight .cell-text{color:#fff!important;-webkit-text-stroke:none!important;text-shadow:none!important}.cell.error.current-cell-highlight *{-webkit-text-stroke:none!important;text-shadow:none!important}.cell.same-number-highlight{position:relative}.cell.same-number-highlight:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-color:transparent;pointer-events:none;z-index:1}.cell.same-number-highlight .cell-text{color:#ffeb3b!important;-webkit-text-stroke:1.5px #000!important;font-weight:900}.cell.error.same-number-highlight .cell-text{color:#fff!important;-webkit-text-stroke:none!important;text-shadow:none!important}.cell.error.same-number-highlight *{-webkit-text-stroke:none!important;text-shadow:none!important}.cell.neighbor-zone-highlight{position:relative}.cell.neighbor-zone-highlight:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-color:#ff00000d;pointer-events:none;z-index:1}.cell.conflict-highlight{position:relative;animation:conflict-pulse 1.5s ease-in-out infinite}.cell.conflict-highlight:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-color:#ff572233;pointer-events:none;z-index:1;animation:conflict-pulse-bg 1.5s ease-in-out infinite}@media (max-width: 767.98px){.game-main{padding:1rem;padding-bottom:calc(4rem + env(safe-area-inset-bottom,0))}.game-info{flex-direction:column;text-align:center}.game-board-container{align-items:stretch;margin-bottom:1.25rem}.game-board{width:100%;max-width:100%;padding:.75rem;margin-left:0;margin-right:0}.cell{width:100%;height:auto;aspect-ratio:1 / 1;font-size:1.1rem}}@media (min-width: 768px){.game-main{padding:2rem}}.cell.error.current-cell-highlight{background-color:#c82333!important;color:#fff!important}.cell.error.current-cell-highlight,.cell.error.current-cell-highlight *,.cell.error.current-cell-highlight .cell-text,.cell.error.same-number-highlight,.cell.error.same-number-highlight *,.cell.error.same-number-highlight .cell-text{-webkit-text-stroke:none!important;text-shadow:none!important}.mobile-number-panel{position:fixed;left:0;right:0;bottom:0;background:var(--surface-color);border-top:1px solid var(--border-color);box-shadow:0 -.5rem 1rem #00000026;transform:translateY(100%);transition:transform .25s ease;z-index:1000;padding-bottom:env(safe-area-inset-bottom,0)}.mobile-number-panel .panel-tabs{position:absolute;top:-1.5rem;left:1rem;display:flex;gap:0;z-index:1001;opacity:1;visibility:visible;transition:all .25s ease}.mobile-number-panel .panel-tab{padding:.25rem .75rem;background:var(--surface-color);border:1px solid var(--border-color);border-bottom:none;color:var(--text-color);font-size:.75rem;font-weight:600;cursor:pointer;transition:all .2s ease;white-space:nowrap;position:relative;z-index:1;height:1.5rem;display:flex;align-items:center;justify-content:center}.mobile-number-panel .panel-tab:first-child{border-radius:.5rem 0 0;border-right:none}.mobile-number-panel .panel-tab:last-child{border-radius:0 .5rem 0 0}.mobile-number-panel .panel-tab:hover{background:var(--background-color);color:var(--primary-color)}.mobile-number-panel .panel-tab.active{background:var(--surface-color);color:var(--text-color);z-index:2;border-bottom:none}.mobile-number-panel .panel-tab.active:hover{background:var(--surface-color);color:var(--text-color)}.mobile-number-panel .panel-tab:not(.active){z-index:1;border-bottom:1px solid var(--border-color)}.mobile-number-panel .panel-close-btn{position:absolute;top:-1.5rem;right:1rem;transform:translateY(0);width:3rem;height:1.5rem;background:var(--surface-color);border:1px solid var(--border-color);border-bottom:none;border-radius:.75rem .75rem 0 0;color:var(--text-color);font-size:1.25rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .25s ease;z-index:1001;opacity:1;visibility:visible}.mobile-number-panel:not(.open) .panel-tabs,.mobile-number-panel:not(.open) .panel-close-btn{opacity:0;visibility:hidden;transform:translateY(-.5rem)}.mobile-number-panel .panel-close-btn:hover{background:var(--background-color);color:var(--primary-color);border-color:var(--primary-color)}.mobile-number-panel .panel-close-btn:active{background:var(--primary-color);color:#fff}.mobile-number-panel.open{transform:translateY(0)}.mobile-number-panel .panel-content{padding:.5rem .75rem}.mobile-number-panel .panel-buttons{display:grid;grid-auto-flow:column;grid-template-columns:repeat(var(--columns, 7),minmax(0,1fr));gap:.5rem;align-items:center}.mobile-number-panel .mode-toggle-btn{width:100%;height:2.75rem;border:1px solid var(--border-color);background-color:#f8f9fa;color:#6c757d;border-radius:.5rem;font-size:1.2rem;font-weight:600;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease}.mobile-number-panel .mode-toggle-btn:hover{background-color:#e9ecef;color:#495057;border-color:#adb5bd}.mobile-number-panel .mode-toggle-btn.draft-mode{background-color:#6c757d;color:#fff;border-color:#6c757d}.mobile-number-panel .mode-toggle-btn.draft-mode:hover{background-color:#5a6268;border-color:#5a6268}.mobile-number-panel .number-btn{width:100%;height:2.75rem;border:1px solid var(--border-color);background-color:var(--background-color);color:var(--text-color);border-radius:.5rem;font-size:1.125rem;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease}.mobile-number-panel .number-btn:hover{background-color:#e3f2fd;color:var(--text-color);border-color:var(--primary-color)}.mobile-number-panel .number-btn.draft-mode{background-color:#f8f9fa;color:#6c757d;border-color:#dee2e6}.mobile-number-panel .number-btn.draft-mode:hover{background-color:#e9ecef;color:#495057;border-color:#adb5bd}.mobile-number-panel .number-btn.draft-mode.active{background-color:#6c757d;color:#fff;border-color:#6c757d}.mobile-number-panel .number-btn.draft-mode.active:hover{background-color:#5a6268;border-color:#5a6268}.mobile-number-panel .number-btn.clear-btn{background-color:var(--danger-color);color:#fff;border-color:var(--danger-color);font-size:1.5rem}.mobile-number-panel .number-btn.clear-btn:hover{background-color:#c82333;border-color:#c82333}@media (max-width: 320px){.mobile-number-panel .panel-buttons{gap:.25rem}.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:2.5rem;font-size:1rem}.mobile-number-panel .number-btn.clear-btn{font-size:1.25rem}.mobile-number-panel .panel-tabs{left:.5rem}.mobile-number-panel .panel-tab{padding:.2rem .5rem;font-size:.65rem;height:1.25rem}.mobile-number-panel .panel-close-btn{width:2.5rem;height:1.25rem;font-size:1rem;right:.5rem}.mobile-number-panel:not(.open) .panel-tabs,.mobile-number-panel:not(.open) .panel-close-btn{transform:translateY(-.25rem)}}@media (min-width: 321px) and (max-width: 375px){.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:2.75rem;font-size:1.125rem}}@media (min-width: 376px) and (max-width: 414px){.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:3rem;font-size:1.25rem}}@media (min-width: 415px){.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:3.25rem;font-size:1.375rem}}@media (max-width: 767.98px) and (orientation: landscape){.mobile-number-panel .panel-buttons{gap:.25rem}.mobile-number-panel .mode-toggle-btn,.mobile-number-panel .number-btn{height:2.5rem;font-size:1rem}.mobile-number-panel .panel-tabs{left:.5rem}.mobile-number-panel .panel-tab{padding:.2rem .5rem;font-size:.65rem;height:1.25rem}.mobile-number-panel .panel-close-btn{width:2.5rem;height:1.25rem;font-size:1rem;right:.5rem}.mobile-number-panel:not(.open) .panel-tabs,.mobile-number-panel:not(.open) .panel-close-btn{transform:translateY(-.25rem)}}@media (min-width: 768px){.mobile-number-panel{display:none}}.number-popover{background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:.75rem;padding:.75rem;box-shadow:0 0 3rem .2rem #00000063;display:flex;flex-direction:column;gap:.5rem;min-width:9rem}.mode-toggle-btn{width:2.75rem;height:2.75rem;border:1px solid var(--border-color);background-color:#f8f9fa;color:#6c757d;border-radius:.5rem;font-size:1.2rem;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.mode-toggle-btn:hover{background-color:#e9ecef;color:#495057;border-color:#adb5bd}.mode-toggle-btn.draft-mode{background-color:#6c757d;color:#fff;border-color:#6c757d}.mode-toggle-btn.draft-mode:hover{background-color:#5a6268;border-color:#5a6268}.numbers-container{display:flex;flex-wrap:wrap;gap:.5rem}.number-btn{width:2.75rem;height:2.75rem;border:1px solid var(--border-color);background-color:var(--background-color);color:var(--text-color);border-radius:.5rem;font-size:1.125rem;font-weight:600;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.number-btn:hover{background-color:#e3f2fd;color:var(--text-color);border-color:var(--primary-color)}.number-btn.clear-btn{background-color:var(--danger-color);color:#fff;border-color:var(--danger-color);font-size:1.5rem;font-weight:700}.number-btn.clear-btn:hover{background-color:#c82333;border-color:#c82333}.number-btn.draft-mode{background-color:#f8f9fa;color:#6c757d;border-color:#dee2e6}.number-btn.draft-mode:hover{background-color:#e9ecef;color:#495057;border-color:#adb5bd}.number-btn.draft-mode.active{background-color:#6c757d;color:#fff;border-color:#6c757d}.number-btn.draft-mode.active:hover{background-color:#5a6268;border-color:#5a6268}@media (max-width: 767.98px){.number-popover{display:none}}.settings-menu-button{background:none;border:none;font-size:1.5rem;color:var(--text-color);cursor:pointer;padding:.5rem;border-radius:.25rem;transition:all .2s ease;display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem}.settings-menu-button:hover{background-color:var(--background-color);color:var(--primary-color)}.settings-menu-button.active{background-color:var(--primary-color);color:#fff}.settings-menu{position:absolute;top:100%;right:0;background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:var(--border-radius);box-shadow:0 .5rem 1rem #00000026;z-index:1000;min-width:20rem;opacity:0;visibility:hidden;transform:translateY(-.5rem);transition:all .2s ease}.settings-menu.open{opacity:1;visibility:visible;transform:translateY(0)}.settings-menu-content{padding:1rem}.settings-section{margin-bottom:1rem}.settings-title{font-size:1rem;font-weight:600;color:var(--text-color);margin-bottom:.75rem;padding-bottom:.5rem;border-bottom:1px solid var(--border-color)}.setting-item{margin-bottom:.75rem}.setting-item:last-child{margin-bottom:0}.setting-label{display:flex;align-items:center;gap:.75rem;cursor:pointer;font-size:.875rem;line-height:1.4;color:var(--text-color);transition:color .2s ease}.setting-label:hover{color:var(--primary-color)}.setting-checkbox{width:1.125rem;height:1.125rem;border:2px solid var(--border-color);border-radius:.25rem;background-color:var(--surface-color);cursor:pointer;position:relative;-webkit-appearance:none;-moz-appearance:none;appearance:none;transition:all .2s ease;flex-shrink:0}.setting-checkbox:checked{background-color:var(--primary-color);border-color:var(--primary-color)}.setting-checkbox:checked:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:.75rem;font-weight:700}.setting-checkbox:focus{outline:none;box-shadow:0 0 0 .125rem #4a90e240}.setting-text{flex:1;-webkit-user-select:none;user-select:none}@media (max-width: 767.98px){.settings-menu{min-width:18rem;right:-1rem}.settings-menu-content{padding:.75rem}.settings-title{font-size:.875rem}.setting-label{font-size:.8125rem;gap:.5rem}.setting-checkbox{width:1rem;height:1rem}.setting-checkbox:checked:after{font-size:.6875rem}}