@font-face{font-family:Roboto;font-style:normal;font-weight:400;font-display:optional;src:url(../assets/fonts/roboto-400.woff2) format("woff2")}@font-face{font-family:Roboto;font-style:normal;font-weight:500;font-display:optional;src:url(../assets/fonts/roboto-500.woff2) format("woff2")}@font-face{font-family:Roboto;font-style:normal;font-weight:700;font-display:optional;src:url(../assets/fonts/roboto-700.woff2) format("woff2")}:root{--bg: #F5F8FC;--surface: #FFFFFF;--text: #344861;--text-secondary: #546178;--primary: #325AAF;--primary-light: #E2EAF5;--danger: #E55C6C;--success: #27AE60;--border: #BFC6D4;--nav-bg: #FFFFFF;--nav-shadow: 0 2px 8px rgba(0,0,0,.08);--cell-selected: #BBDEFB;--cell-related: #E2EAF5;--cell-same: #C8E6C9;--btn-bg: #FFFFFF;--btn-hover: #E2EAF5;--btn-active: #325AAF;--btn-active-text: #FFFFFF;--modal-bg: rgba(0,0,0,.5);--num-btn-size: 56px;--font-main: "Roboto", system-ui, -apple-system, sans-serif}[data-theme=dark]{--bg: #0B1422;--surface: #16213E;--text: #E0E0E0;--text-secondary: #9AA8B8;--primary: #5BA4E6;--primary-light: #1a3358;--danger: #EF5350;--success: #2ECC71;--border: #4a5e82;--nav-bg: #16213E;--nav-shadow: 0 2px 8px rgba(0,0,0,.3);--btn-bg: #1a2744;--btn-hover: #1a3358;--btn-active: #5BA4E6;--btn-active-text: #0B1422;--modal-bg: rgba(0,0,0,.7)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-40px;left:0;background:var(--primary);color:#fff;padding:8px 16px;z-index:100;transition:top .2s}.skip-link:focus{top:0}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100dvh}a{color:var(--primary);text-decoration:none}button{cursor:pointer;border:none;background:none;font-family:inherit;color:inherit}.nav-bar{background:var(--nav-bg);box-shadow:var(--nav-shadow);position:sticky;top:0;z-index:100}.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:56px;gap:12px}.nav-left{display:flex;align-items:center;gap:12px}.nav-tabs{display:flex;gap:4px}.nav-tab{padding:8px 16px;border-radius:18px;font-size:15px;font-weight:500;color:var(--text-secondary);transition:all .2s}.nav-tab:hover{color:var(--text);background:var(--primary-light)}.nav-tab.active{color:var(--primary);background:var(--primary-light);font-weight:600}.nav-right{display:flex;align-items:center;gap:10px}.nav-link{font-size:13px;color:var(--text-secondary);padding:6px 10px;border-radius:6px;transition:color .2s}.nav-link:hover{color:var(--text)}.btn-icon{font-size:18px;padding:4px}.nav-hamburger{display:flex;align-items:center;justify-content:center;padding:6px;border-radius:8px;color:var(--text);transition:background .15s}.nav-hamburger:hover{background:var(--primary-light)}.side-menu-overlay{display:none;position:fixed;inset:0;background:#0006;z-index:150}.side-menu-overlay.show{display:block}.side-menu{position:fixed;top:0;left:-280px;width:280px;height:100%;background:var(--surface);z-index:200;box-shadow:4px 0 16px #00000026;transition:left .25s ease;overflow-y:auto}.side-menu.open{left:0}.side-menu-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.side-menu-close{display:flex;align-items:center;padding:4px;border-radius:6px;color:var(--text-secondary);transition:all .15s}.side-menu-close:hover{background:var(--primary-light);color:var(--text)}.side-menu-items{padding:8px 0}.side-menu-item{display:flex;align-items:center;gap:14px;padding:14px 20px;font-size:15px;font-weight:500;color:var(--text);text-decoration:none;transition:background .15s;width:100%;text-align:left}.side-menu-item:hover{background:var(--primary-light)}.side-menu-item svg{color:var(--text-secondary);flex-shrink:0}.side-menu-toggle{cursor:pointer;justify-content:flex-start}.side-menu-toggle input{display:none}.side-menu-toggle .toggle-switch{margin-left:auto}.side-menu-divider{height:1px;background:var(--border);margin:8px 20px}.nav-logo-text{font-size:28px;font-weight:700;color:var(--primary);letter-spacing:-.5px}.game-status-bar{background:var(--bg);border-bottom:1px solid var(--border)}.game-status-inner{max-width:550px;margin:0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:8px 16px}.game-status-inner>:first-child{justify-self:start}.game-status-inner>:nth-child(2){justify-self:center}.game-status-inner>:last-child{justify-self:end}.pause-btn{font-size:14px;padding:6px 8px;min-width:36px;min-height:36px;opacity:.6;transition:opacity .2s;vertical-align:middle;display:inline-flex;align-items:center;justify-content:center}.pause-btn:hover{opacity:1}.game-stat{font-size:15px;color:var(--text-secondary);white-space:nowrap}.game-stat strong{color:var(--text)}.main-layout{max-width:1200px;margin:0 auto;padding:12px 16px;display:flex;gap:24px;justify-content:center}.game-area{flex:0 1 500px;max-width:500px;width:100%}.sidebar{flex:0 0 300px;display:none}.difficulty-selector{position:relative}.difficulty-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;font-size:15px;font-weight:600;color:var(--primary);background:var(--primary-light);border-radius:8px;transition:all .2s}.difficulty-btn:hover{opacity:.8}.difficulty-dropdown{display:none;position:absolute;top:100%;left:0;margin-top:4px;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:0 8px 24px #0000001f;overflow:hidden;z-index:50;min-width:160px}.difficulty-dropdown.open{display:block}.difficulty-dropdown button{display:block;width:100%;padding:10px 16px;text-align:left;font-size:14px;transition:background .15s}.difficulty-dropdown button:hover{background:var(--primary-light)}.difficulty-dropdown button.active{color:var(--primary);font-weight:600}.btn-new-game{padding:8px 18px;background:var(--primary);color:#fff;border-radius:8px;font-size:15px;font-weight:600;transition:opacity .2s}.btn-new-game:hover{opacity:.85}#mistakeValue{font-weight:600}.timer{cursor:pointer}.board-container{width:100%;aspect-ratio:1;max-width:500px;margin:0 auto;touch-action:none}#gameCanvas{display:block;width:100%;height:100%;border-radius:4px}.number-pad{display:flex;justify-content:center;gap:clamp(2px,1vw,6px);padding:14px 0 8px}.num-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;width:var(--num-btn-size);min-width:30px;max-width:56px;flex:1 1 0;height:calc(var(--num-btn-size) + 8px);background:var(--btn-bg);border:1px solid var(--border);border-radius:10px;font-size:28px;font-weight:600;color:var(--primary);transition:all .15s;user-select:none;-webkit-tap-highlight-color:transparent;position:relative}.num-btn.hover{background:var(--btn-hover)}.num-btn:active{transform:scale(.95)}.num-btn:focus{outline:none}.num-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.num-btn.pressed{background:var(--btn-hover);transform:scale(.93)}.num-btn.disabled{opacity:.3;pointer-events:none}.number-pad.notes-mode .num-btn{border-style:dashed;color:var(--text-secondary);font-size:18px}.number-pad.notes-mode .num-btn:not(.disabled){border-color:var(--primary)}.emoji-message{text-align:center;height:28px;line-height:28px;font-size:15px;font-weight:600;color:var(--primary);opacity:0;transition:opacity .3s}.emoji-message.show{opacity:1;animation:emojiPop .4s ease-out}@keyframes emojiPop{0%{transform:scale(.5);opacity:0}60%{transform:scale(1.15)}to{transform:scale(1);opacity:1}}.control-bar{display:flex;justify-content:center;gap:8px;padding:6px 0 12px}.ctrl-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 20px;border-radius:10px;font-size:15px;color:var(--text-secondary);transition:all .15s;position:relative;user-select:none;-webkit-tap-highlight-color:transparent}.ctrl-btn svg{width:22px;height:22px}.ctrl-btn.hover{background:var(--btn-hover);color:var(--text)}.ctrl-btn:active{transform:scale(.95)}.ctrl-btn:focus{outline:none}.ctrl-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.ctrl-btn.active{background:var(--primary);color:#fff;border-radius:10px}.ctrl-btn.pressed{background:var(--btn-hover);transform:scale(.92)}.hint-badge{position:absolute;top:2px;right:4px;background:var(--primary);color:#fff;font-size:9px;font-weight:700;min-width:18px;height:18px;padding:0 4px;border-radius:9px;display:flex;align-items:center;justify-content:center}.modal-overlay{display:none;position:fixed;inset:0;background:var(--modal-bg);z-index:200;align-items:center;justify-content:center}.modal-overlay.show{display:flex}.modal{background:var(--surface);border-radius:16px;padding:32px;max-width:380px;width:90%;text-align:center}.modal h2{font-size:24px;margin-bottom:12px}.modal p{color:var(--text-secondary);margin-bottom:12px}.modal-actions{display:flex;gap:12px;justify-content:center}.btn-primary{padding:10px 28px;background:var(--primary);color:#fff;border-radius:10px;font-size:15px;font-weight:600;transition:opacity .2s}.btn-primary:hover{opacity:.85}.btn-secondary{padding:10px 28px;background:var(--btn-bg);border:1px solid var(--border);border-radius:10px;font-size:15px;font-weight:500;transition:background .2s}.btn-secondary:hover{background:var(--btn-hover)}.modal-clear h2{font-size:28px}.clear-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}.clear-stat{display:flex;flex-direction:column;gap:4px}.clear-label{font-size:12px;color:var(--text-secondary);text-transform:uppercase}.clear-value{font-size:20px;font-weight:700;color:var(--primary)}.modal-awards{max-width:480px}.awards-counter{text-align:center;font-size:14px;color:var(--text-secondary);margin-bottom:16px}.awards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;max-height:400px;overflow-y:auto;padding:4px}.award-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 6px;border-radius:10px;background:var(--primary-light);text-align:center;opacity:.35;filter:grayscale(1);transition:all .2s}.award-item.unlocked{opacity:1;filter:none}.award-icon{font-size:28px}.award-name{font-size:11px;font-weight:700;color:var(--text);line-height:1.2}.award-desc{font-size:10px;color:var(--text-secondary);line-height:1.2}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.modal-settings{max-width:420px;text-align:left}.modal-settings h2{text-align:center}.settings-list{margin:20px 0}.setting-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--border);cursor:pointer;font-size:15px;user-select:none}.setting-row:last-child{border-bottom:none}.setting-row input[type=checkbox]{display:none}.toggle-switch{position:relative;width:44px;height:24px;background:var(--border);border-radius:12px;flex-shrink:0;transition:background .2s}.toggle-switch:after{content:"";position:absolute;top:2px;left:2px;width:20px;height:20px;background:#fff;border-radius:50%;transition:transform .2s;box-shadow:0 1px 3px #0003}.setting-row input:checked+.toggle-switch{background:var(--primary)}.setting-row input:checked+.toggle-switch:after{transform:translate(20px)}.modal-stats{max-width:480px}.stats-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:16px 0}.stats-card{text-align:center;padding:12px 4px;background:var(--primary-light);border-radius:10px}.stats-num{display:block;font-size:24px;font-weight:700;color:var(--primary)}.stats-label{display:block;font-size:11px;color:var(--text-secondary);margin-top:4px;line-height:1.2}.stats-tabs{display:flex;gap:4px;margin:12px 0 8px;justify-content:center}.stats-tab{padding:6px 16px;border-radius:16px;font-size:13px;font-weight:500;color:var(--text-secondary);transition:all .2s}.stats-tab:hover{color:var(--text)}.stats-tab.active{color:var(--primary);background:var(--primary-light);font-weight:600}.stats-table{width:100%;border-collapse:collapse;font-size:14px}.stats-table th{font-size:12px;font-weight:500;color:var(--text-secondary);text-transform:uppercase;padding:8px 6px;text-align:center;border-bottom:1px solid var(--border)}.stats-table td{padding:10px 6px;text-align:center;border-bottom:1px solid var(--border)}.stats-table td:first-child{text-align:left;font-weight:500}.stats-table .best-time{color:var(--success);font-weight:600}.seo-content{background:var(--surface);border-top:1px solid var(--border);padding:48px 16px;margin-top:24px}.seo-inner{max-width:700px;margin:0 auto}.seo-content h1{font-size:36px;font-weight:700;margin-bottom:16px;color:var(--text)}.seo-content h2{font-size:26px;font-weight:600;margin:32px 0 12px;color:var(--text)}.seo-content a{text-decoration:underline}.seo-content p{color:var(--text-secondary);font-size:17px;line-height:1.8}.footer{background:var(--nav-bg);border-top:1px solid var(--border);padding:24px 16px}.footer-inner{max-width:1200px;margin:0 auto;text-align:center}.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:12px}.footer-links a{font-size:13px;color:var(--text-secondary)}.footer-links a:hover{color:var(--text)}.footer-copy{font-size:12px;color:var(--text-secondary)}@media(max-width:480px){:root{--num-btn-size: 36px}.nav-inner{height:42px;padding:0 10px}.nav-logo-text{font-size:16px}.nav-tabs{gap:2px}.nav-tab{padding:4px 8px;font-size:12px}.btn-new-game{padding:4px 8px;font-size:11px}.btn-icon svg{width:16px;height:16px}.game-status-inner{padding:4px 10px}.game-stat{font-size:12px}.main-layout{padding:4px}.game-area{max-width:100%}.num-btn{width:36px;height:44px;font-size:18px;border-radius:8px}.number-pad{gap:4px}.ctrl-btn{padding:6px 12px}.ctrl-btn svg{width:20px;height:20px}.seo-content{padding:32px 12px}.modal{padding:24px 16px}.modal-stats{max-width:340px}.stats-summary{gap:4px}.stats-num{font-size:20px}.stats-label{font-size:10px}.stats-table{font-size:12px}.setting-row{padding:10px 0;font-size:14px}}@media(min-width:481px)and (max-width:768px){.game-area{max-width:480px}}@media(min-width:769px){.sidebar{display:block}.game-area{max-width:500px}.num-btn{width:58px;height:70px;font-size:28px}.ctrl-btn{padding:12px 24px;font-size:14px}.ctrl-btn svg{width:26px;height:26px}}@media(min-width:1024px){.main-layout{padding:20px 32px}}