:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#253047;background:#f4f5fb;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #253047;--muted: #68728a;--surface: #ffffff;--surface-soft: #f2f3fb;--line: #cbd0df;--line-strong: #48536b;--primary: #5367d9;--primary-dark: #3d4fb6;--primary-soft: #e8ebff;--accent-animals: #5367d9;--accent-space: #6554c0;--accent-food: #bd465a;--accent-dinosaurs: #397c58;--accent-numbers: #287180;--theme-accent: var(--primary);--success: #25745b;--success-soft: #def4e9;--warning: #9b5b00;--warning-soft: #fff2d5;--danger: #a9344b;--danger-soft: #fff0f2;--shadow: 0 14px 40px rgb(38 48 76 / 10%)}*{box-sizing:border-box}html{background:#f4f5fb}body{margin:0;min-height:100vh;min-height:100dvh;overflow-x:hidden;background:#f4f5fb}button,input,select{font:inherit}button,label{-webkit-tap-highlight-color:transparent}button{color:inherit}button:not(:disabled),label,select{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}h1,h2,h3,p{margin-top:0}h1,h2,h3,.mini-brand,.choice-title{font-family:ui-rounded,Arial Rounded MT Bold,system-ui,sans-serif}button,.sudoku-board{user-select:none;-webkit-user-select:none;touch-action:manipulation}:focus-visible{outline:3px solid #1b70d1;outline-offset:3px}.skip-link{position:fixed;z-index:1000;top:8px;left:8px;padding:10px 14px;color:#fff;background:#172033;border-radius:8px;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.app-shell{min-height:100vh;min-height:100dvh;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);color:var(--ink)}.page,.game-page{width:min(100%,1180px);min-height:100vh;margin:0 auto;padding:max(16px,env(safe-area-inset-top)) clamp(12px,3vw,32px) max(24px,env(safe-area-inset-bottom))}.eyebrow{margin-bottom:6px;color:var(--theme-accent);font-family:ui-rounded,Arial Rounded MT Bold,system-ui,sans-serif;font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.primary-button,.secondary-button,.danger-button,.small-button,.text-button,.header-button,.icon-text-button{min-height:44px;border-radius:13px;border:0;font-weight:700}.primary-button{padding:12px 22px;color:#fff;background:var(--theme-accent, var(--primary));box-shadow:0 5px color-mix(in srgb,var(--theme-accent, var(--primary)) 72%,#000)}.primary-button:active{transform:translateY(3px);box-shadow:0 2px color-mix(in srgb,var(--theme-accent, var(--primary)) 72%,#000)}.secondary-button{padding:11px 20px;background:#fff;border:2px solid var(--line)}.secondary-button:hover{border-color:var(--theme-accent);background:var(--primary-soft)}.text-button,.icon-text-button,.header-button{padding:8px 10px;color:#39465f;background:transparent}.text-button:hover,.icon-text-button:hover,.header-button:hover,.quiet-link:hover{color:var(--primary-dark);background:var(--primary-soft)}.quiet-link,.danger-link{min-height:44px;padding:9px 10px;border:0;border-radius:10px;color:#4b5872;background:transparent;text-decoration:underline;text-underline-offset:3px;font-weight:700}.danger-link{color:var(--danger)}.danger-button{padding:10px 16px;color:#fff;background:var(--danger)}.small-button{padding:8px 13px;color:#fff;background:var(--primary-dark)}.welcome-page{min-height:100vh;min-height:100dvh;padding:max(14px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) max(20px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));display:flex;flex-direction:column;background:#f8f8fc}.welcome-nav{width:min(100%,1120px);margin:0 auto;min-height:48px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 12px}.welcome-nav .text-button{margin-left:auto}.mini-brand{color:#33405c;font-weight:800}.welcome-hero{width:min(100%,720px);margin:auto;padding:24px 0 30px;text-align:center}.brand-mark{width:min(76vw,300px);margin:0 auto 22px;display:grid;grid-template-columns:repeat(4,1fr);overflow:hidden;border:4px solid var(--line-strong);border-radius:22px;background:#fff;box-shadow:var(--shadow)}.brand-mark span{aspect-ratio:1;display:grid;place-items:center;font-size:clamp(2rem,10vw,4.3rem);border-right:2px solid var(--line)}.brand-mark span:last-child{border-right:0}.welcome-hero h1{margin-bottom:12px;font-size:clamp(2.1rem,8vw,4.8rem);line-height:1.02;letter-spacing:-.035em}.hero-copy{max-width:530px;margin:0 auto 24px;color:var(--muted);font-size:clamp(1rem,3vw,1.25rem);line-height:1.5}.friendly-notice{width:min(100%,520px);margin:0 auto 18px;padding:11px 14px;color:#6d4610;border:2px solid #e3bd68;border-radius:12px;background:var(--warning-soft);font-weight:700}.theme-welcome{margin:24px auto}.theme-welcome legend{width:100%;margin-bottom:12px;font-size:1rem;text-align:center}.welcome-theme-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.welcome-theme{position:relative;width:76px;min-height:76px;padding:7px 4px;display:grid;gap:2px;place-items:center;border:2px solid var(--line);border-radius:16px;background:#fff}.welcome-theme input{position:absolute;width:1px;height:1px;opacity:0}.welcome-theme:has(input:focus-visible){outline:3px solid #1b70d1;outline-offset:3px}.welcome-theme span{font-size:1.8rem;line-height:1}.welcome-theme small{max-width:100%;overflow-wrap:anywhere;font-size:.7rem;font-weight:700}.welcome-theme.is-chosen{border-color:var(--theme-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--theme-accent) 18%,transparent)}.welcome-actions{width:min(100%,360px);margin:20px auto 0;display:grid;gap:12px}.trust-strip{display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:center;color:var(--muted);font-size:.85rem}.trust-strip span:before{content:"✓";margin-right:5px;color:var(--success);font-weight:800}.screen-heading{display:flex;align-items:flex-start;gap:14px;margin:12px 0 28px}.screen-heading h1{margin:0;font-size:clamp(1.8rem,5vw,3rem)}.setup-form{display:grid;gap:28px}fieldset{min-width:0;padding:0;margin:0;border:0}legend{margin-bottom:12px;font-family:ui-rounded,Arial Rounded MT Bold,system-ui,sans-serif;font-size:1.1rem;font-weight:800}.choice-grid{display:grid;gap:10px}.board-size-choices{grid-template-columns:repeat(3,minmax(0,1fr))}.theme-choices{grid-template-columns:repeat(5,minmax(0,1fr))}.choice-card{position:relative;min-width:0;min-height:104px;padding:13px;display:flex;flex-direction:column;align-items:flex-start;gap:3px;border:2px solid var(--line);border-radius:17px;background:#fff}.choice-card input{position:absolute;width:1px;height:1px;opacity:0}.choice-card:has(input:focus-visible){outline:3px solid #1b70d1;outline-offset:3px}.choice-card.is-chosen{border-color:var(--theme-accent);background:color-mix(in srgb,var(--theme-accent) 7%,white);box-shadow:inset 0 0 0 1px var(--theme-accent)}.choice-card.is-chosen:after{content:"✓";position:absolute;top:8px;right:9px;width:22px;height:22px;display:grid;place-items:center;color:#fff;background:var(--theme-accent);border-radius:50%;font-weight:800}.choice-title{width:100%;min-width:0;padding-right:22px;overflow-wrap:anywhere;font-weight:800}.choice-detail{color:var(--theme-accent);font-size:1.15rem;font-weight:800}.choice-help{max-width:100%;color:var(--muted);overflow-wrap:anywhere;font-size:.78rem;line-height:1.25}.theme-choice{min-height:118px}.theme-preview{white-space:nowrap;font-size:clamp(1rem,2.6vw,1.65rem);letter-spacing:.05em}.setup-two-column{display:grid;grid-template-columns:1fr 1fr;gap:24px}.segmented-control{display:grid;grid-template-columns:repeat(3,1fr);padding:4px;border-radius:14px;background:#e8eaf2}.segmented-control label{position:relative}.segmented-control input{position:absolute;opacity:0}.segmented-control span{min-height:44px;display:grid;place-items:center;border-radius:10px;font-weight:700}.segmented-control input:checked+span{color:#fff;background:var(--theme-accent)}.segmented-control input:focus-visible+span{outline:3px solid #1b70d1}.wide-radio{position:relative;min-height:54px;padding:8px 10px;display:flex;align-items:flex-start;gap:9px;border-radius:12px}.wide-radio:has(input:checked){background:var(--primary-soft)}.wide-radio input{width:20px;height:20px;flex:0 0 auto;accent-color:var(--theme-accent)}.wide-radio span{display:grid}.wide-radio small{color:var(--muted)}.quick-options{padding:16px 18px;border:1px solid var(--line);border-radius:18px;background:#fff}.switch-row,.select-row{min-height:58px;padding:9px 2px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid #e7e9f0}.switch-row:last-child,.select-row:last-child{border-bottom:0}.switch-row>span,.select-row>span{display:grid;gap:2px}.switch-row small{color:var(--muted);line-height:1.25}.switch-row input[type=checkbox]{appearance:none;width:50px;height:29px;flex:0 0 auto;padding:3px;border:2px solid #929aab;border-radius:999px;background:#fff}.switch-row input[type=checkbox]:before{content:"";display:block;width:19px;height:19px;border-radius:50%;background:#737d91;transition:transform .16s ease}.switch-row input[type=checkbox]:checked{border-color:var(--theme-accent);background:var(--theme-accent)}.switch-row input[type=checkbox]:checked:before{background:#fff;transform:translate(21px)}.start-button{width:min(100%,390px);margin:0 auto;font-size:1.05rem}.game-page{padding-top:max(8px,env(safe-area-inset-top))}.game-header{min-height:56px;display:grid;grid-template-columns:72px minmax(0,1fr) 72px;align-items:center;gap:8px;margin-bottom:8px}.game-title{min-width:0;display:flex;align-items:center;justify-content:center;gap:8px;text-align:left}.theme-dot{width:10px;height:10px;flex:0 0 auto;border-radius:50%}.game-title div{min-width:0;display:grid}.game-title strong,.game-title small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.game-title strong{font-family:ui-rounded,Arial Rounded MT Bold,system-ui,sans-serif}.game-title small{color:var(--muted);text-transform:capitalize}.game-layout{display:grid;grid-template-columns:minmax(0,650px) minmax(230px,300px);justify-content:center;align-items:start;gap:clamp(22px,4vw,54px)}.play-column{min-width:0;width:100%}.game-progress-line{margin:4px auto 10px}.progress-copy{display:flex;justify-content:space-between;margin-bottom:5px;color:var(--muted);font-size:.83rem;font-weight:700}.progress-track{height:7px;overflow:hidden;border-radius:99px;background:#dedfeb}.progress-track span{display:block;height:100%;border-radius:inherit;background:var(--theme-accent);transition:width .22s ease}.board-wrap{position:relative;width:100%}.sudoku-board{--board-size: 4;width:min(100%,640px);aspect-ratio:1;margin:0 auto;display:grid;grid-template-rows:repeat(var(--board-size),minmax(0,1fr));overflow:hidden;border:3px solid var(--line-strong);border-radius:clamp(9px,2.5vw,18px);background:var(--line-strong);box-shadow:0 10px 30px #232c4724;contain:layout paint}.sudoku-row{min-height:0;display:grid;grid-template-columns:repeat(var(--board-size),minmax(0,1fr))}.sudoku-cell{position:relative;min-width:0;min-height:0;aspect-ratio:1;padding:0;display:grid;place-items:center;overflow:hidden;border:0;border-top:1px solid var(--line);border-left:1px solid var(--line);border-radius:0;background:#fff;line-height:1}.sudoku-cell.region-top{border-top:3px solid var(--line-strong)}.sudoku-cell.region-left{border-left:3px solid var(--line-strong)}.sudoku-cell.region-bottom{box-shadow:inset 0 -2px 0 var(--line-strong)}.sudoku-cell.region-right{box-shadow:inset -2px 0 0 var(--line-strong)}.sudoku-cell.region-bottom.region-right{box-shadow:inset 0 -2px 0 var(--line-strong),inset -2px 0 0 var(--line-strong)}.sudoku-cell.is-given{background:#f0f1f7;font-weight:800}.sudoku-cell.is-given:before{content:"";position:absolute;top:4px;left:4px;width:5px;height:5px;border-radius:50%;background:#6f7789}.sudoku-cell.is-related{background-color:#f1f3ff;background-image:radial-gradient(circle,rgb(72 83 107 / 18%) 1px,transparent 1px);background-size:9px 9px}.sudoku-cell.is-same-value:not(.is-selected){background:#e5e9ff;outline:2px dashed color-mix(in srgb,var(--theme-accent) 60%,var(--line-strong));outline-offset:-5px}.sudoku-cell.is-selected{z-index:2;background:#fff;box-shadow:inset 0 0 0 4px var(--theme-accent)!important}.sudoku-cell.is-hinted{background-color:#fff4c8;background-image:repeating-linear-gradient(135deg,transparent,transparent 6px,rgb(155 91 0 / 9%) 6px,rgb(155 91 0 / 9%) 9px)}.sudoku-cell.is-hinted:after{content:"?";position:absolute;right:4px;bottom:2px;color:var(--warning);font-size:.72rem;font-weight:900}.sudoku-cell.has-conflict{color:var(--danger);background-color:var(--danger-soft);background-image:repeating-linear-gradient(-45deg,transparent,transparent 7px,rgb(169 52 75 / 9%) 7px,rgb(169 52 75 / 9%) 10px)}.sudoku-cell.has-conflict .cell-symbol{text-decoration:underline wavy var(--danger) 2px;text-underline-offset:4px}.conflict-mark{position:absolute;top:2px;right:3px;width:14px;height:14px;display:grid;place-items:center;color:#fff;background:var(--danger);border-radius:50%;font:800 .65rem/1 sans-serif}.cell-symbol{display:block;transform:translateY(1px)}.size-4 .cell-symbol{font-size:clamp(2.4rem,15vw,5.2rem)}.size-6 .cell-symbol{font-size:clamp(1.65rem,9.5vw,3.5rem)}.size-9 .cell-symbol{font-size:clamp(1.02rem,5.7vw,2.25rem)}.symbols-large .cell-symbol{transform:translateY(1px) scale(1.1)}.cell-notes{width:88%;height:88%;display:grid;grid-template-columns:repeat(3,1fr);align-items:center;justify-items:center;font-size:clamp(.32rem,1.8vw,.72rem);line-height:1}.size-4 .cell-notes{grid-template-columns:repeat(2,1fr);font-size:clamp(.6rem,4vw,1.25rem)}.size-6 .cell-notes{grid-template-columns:repeat(3,1fr);font-size:clamp(.42rem,2.5vw,.9rem)}.pause-cover{position:absolute;inset:0;z-index:5;display:grid;place-content:center;justify-items:center;padding:20px;border-radius:16px;background:#f7f8fcf5;text-align:center}.pause-cover strong{font-family:ui-rounded,Arial Rounded MT Bold,system-ui,sans-serif;font-size:1.4rem}.pause-cover p{margin:4px 0 16px;color:var(--muted)}.guidance-message{margin:10px 0 0;padding:10px 13px;color:#654511;border:2px solid #dfbe67;border-radius:13px;background:#fff9e8;font-weight:700;line-height:1.4}.hint-card{margin:10px 0 0;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:2px solid #e7c66c;border-radius:14px;background:#fffbeb}.hint-card p{margin:3px 0 0;line-height:1.35}.hint-level{color:var(--warning);font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.hint-actions{display:flex;flex:0 0 auto;align-items:center;gap:2px}.symbol-tray{margin:12px auto 8px;display:grid;grid-template-columns:repeat(var(--board-size, 4),minmax(0,1fr));gap:clamp(4px,1.4vw,9px)}.symbol-tray.tray-4{--board-size: 4}.symbol-tray.tray-6{--board-size: 6}.symbol-tray.tray-9{--board-size: 9}.symbol-button{position:relative;min-width:0;min-height:50px;padding:4px 2px 2px;display:grid;place-items:center;border:2px solid var(--line);border-radius:12px;background:#fff}.symbol-button.is-active{border-color:var(--theme-accent);background:var(--primary-soft);box-shadow:inset 0 0 0 1px var(--theme-accent)}.symbol-button.is-complete{background:#edf4f1;border-style:dashed}.symbol-button.is-complete:after{content:"✓";position:absolute;top:1px;right:3px;color:var(--success);font-size:.7rem;font-weight:900}.tray-symbol{font-size:clamp(1.35rem,6.8vw,2.2rem);line-height:1}.tray-9 .tray-symbol{font-size:clamp(1rem,5vw,1.8rem)}.symbol-progress{color:var(--muted);font-size:clamp(.53rem,1.8vw,.7rem);font-weight:700;line-height:1}.game-tools{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;padding:3px 0}.game-tools button{min-width:54px;min-height:52px;padding:5px 7px;display:grid;place-items:center;gap:1px;border:0;border-radius:12px;color:#536078;background:transparent;font-size:.75rem;font-weight:700}.game-tools button>span:first-child{font-size:1.2rem;line-height:1}.game-tools button:hover,.game-tools button.is-active{color:var(--primary-dark);background:var(--primary-soft)}.game-tools button.is-active{box-shadow:inset 0 0 0 2px var(--theme-accent)}.game-side-panel{margin-top:52px;padding:24px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}.game-side-panel h2{margin-bottom:8px}.game-side-panel>p:not(.eyebrow){color:var(--muted);line-height:1.5}.puzzle-details{margin:20px 0}.puzzle-details div{min-height:38px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e8eaf0}.puzzle-details dt{color:var(--muted)}.puzzle-details dd{margin:0;font-weight:800;text-transform:capitalize}.side-select{display:grid;gap:6px;margin-bottom:12px;font-weight:700}.side-select select,.select-row select{min-height:44px;padding:8px 34px 8px 10px;border:2px solid var(--line);border-radius:10px;background:#fff}.modal-backdrop{position:fixed;inset:0;z-index:100;padding:max(12px,env(safe-area-inset-top)) max(12px,env(safe-area-inset-right)) max(12px,env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left));display:grid;place-items:center;overflow-y:auto;background:#171f329e}.modal-card{width:min(100%,540px);max-height:calc(100dvh - 24px);overflow:auto;padding:clamp(18px,4vw,28px);border-radius:22px;background:#fff;box-shadow:0 20px 70px #0a12284d}.modal-card:focus{outline:none}.modal-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.modal-header h2{margin:0;font-size:clamp(1.35rem,5vw,1.8rem)}.modal-intro{color:var(--muted)}.modal-actions{margin-top:20px;display:flex;justify-content:flex-end;gap:10px}.split-actions{justify-content:space-between}.menu-stack,.completion-actions{display:grid;gap:10px}.inline-confirm,.confirm-strip{margin-top:16px;padding:13px;border:2px solid #eab0ba;border-radius:13px;background:var(--danger-soft)}.inline-confirm p{margin:5px 0 12px;color:#6a4250}.inline-confirm div{display:flex;flex-wrap:wrap;gap:7px}.settings-modal{width:min(100%,620px)}.settings-list{display:grid}.settings-maintenance{margin-top:20px;padding-top:16px;display:grid;gap:8px;border-top:2px solid #eceef3}.confirm-strip{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.tutorial-progress{display:flex;gap:5px;margin-bottom:14px}.tutorial-progress span{height:5px;flex:1;border-radius:99px;background:#e1e3ec}.tutorial-progress span.is-current{background:var(--theme-accent)}.tutorial-content{text-align:center}.tutorial-content h3{margin-bottom:7px;font-size:1.35rem}.tutorial-content>p:last-child{color:var(--muted);line-height:1.45}.tutorial-visual{min-height:142px;margin-bottom:17px;display:grid;place-items:center}.tutorial-line{display:grid;grid-template-columns:repeat(4,1fr);border:3px solid var(--line-strong);border-radius:13px;overflow:hidden}.tutorial-line span,.tutorial-column span,.tutorial-box span{width:64px;height:64px;display:grid;place-items:center;border:1px solid var(--line);background:#fff;font-size:2.1rem}.tutorial-column{display:grid;grid-template-columns:1fr;border:3px solid var(--line-strong);border-radius:13px;overflow:hidden}.tutorial-column span{width:70px;height:34px;font-size:1.55rem}.tutorial-box{display:grid;grid-template-columns:repeat(2,1fr);border:4px solid var(--line-strong);border-radius:13px;overflow:hidden}.tutorial-box span{width:62px;height:62px}.tutorial-try{width:min(100%,290px)}.tutorial-mini-grid{display:grid;grid-template-columns:repeat(4,1fr);border:3px solid var(--line-strong);border-radius:10px;overflow:hidden}.tutorial-mini-grid button{min-height:58px;padding:0;border:1px solid var(--line);background:#fff;font-size:1.8rem}.tutorial-mini-grid button.is-selected{box-shadow:inset 0 0 0 4px var(--theme-accent);background:var(--primary-soft)}.tutorial-symbols{margin-top:8px;display:grid;grid-template-columns:repeat(4,1fr);gap:6px}.tutorial-symbols button{min-height:48px;border:2px solid var(--line);border-radius:9px;background:#fff;font-size:1.5rem}.tutorial-symbols button.is-selected{border-color:var(--theme-accent);box-shadow:inset 0 0 0 2px var(--theme-accent)}.mini-success{margin:7px 0 0!important;color:var(--success)!important;font-weight:800}.completion-modal{text-align:center}.celebration{height:90px;display:flex;align-items:center;justify-content:center;gap:10px}.celebration span{font-size:clamp(2rem,10vw,3.5rem);animation:happy-hop .65s cubic-bezier(.2,.8,.3,1.2) var(--delay) both}@keyframes happy-hop{0%{opacity:0;transform:translateY(30px) rotate(-10deg) scale(.6)}70%{opacity:1;transform:translateY(-8px) rotate(5deg) scale(1.1)}to{transform:translateY(0) rotate(0) scale(1)}}.animation-gentle .celebration span{animation-duration:.36s}.celebration.no-motion span{animation:none}.completion-copy h3{margin-bottom:6px;font-size:2rem}.completion-copy p:last-child{color:var(--muted)}.accomplishments{display:grid;grid-template-columns:repeat(4,1fr);margin:18px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden}.accomplishments div{padding:10px 4px;border-right:1px solid var(--line)}.accomplishments div:last-child{border-right:0}.accomplishments dt{color:var(--muted);font-size:.72rem}.accomplishments dd{margin:3px 0 0;font-weight:800;text-transform:capitalize}.error-page{min-height:100vh;display:grid;place-items:center;padding:20px}.error-card{width:min(100%,460px);padding:32px;border-radius:22px;background:#fff;box-shadow:var(--shadow);text-align:center}.error-symbol{font-size:4rem}.error-card p{color:var(--muted);line-height:1.5}.visual-feedback .sudoku-cell:active,.visual-feedback .symbol-button:active{transform:scale(.94)}.high-contrast{--ink: #111;--muted: #343434;--line: #575757;--line-strong: #000;--primary-soft: #e5e5e5}.high-contrast .sudoku-cell.is-related{background:#eee}.high-contrast .sudoku-cell.is-selected{box-shadow:inset 0 0 0 5px #005fcc!important}.reduce-motion *,.reduce-motion *:before,.reduce-motion *:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media(forced-colors:active){.sudoku-board,.sudoku-cell,.symbol-button,.game-tools button,.modal-card{border-color:CanvasText;forced-color-adjust:auto}.sudoku-cell.is-selected{outline:4px solid Highlight;outline-offset:-5px}.conflict-mark,.sudoku-cell.is-given:before{border:1px solid CanvasText}}@media(max-width:800px){.game-layout{display:block}.game-side-panel{display:none}.theme-choices{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:560px){.page,.game-page{padding-left:10px;padding-right:10px}.game-page{padding-bottom:max(12px,env(safe-area-inset-bottom))}.game-header{grid-template-columns:auto minmax(0,1fr) auto;margin-bottom:4px}.header-button{padding:5px 2px;font-size:.78rem}.game-title strong{font-size:.9rem}.game-title small{font-size:.69rem}.board-size-choices{grid-template-columns:1fr}.choice-card{min-height:82px}.theme-choices{grid-template-columns:repeat(2,minmax(0,1fr))}.setup-two-column{grid-template-columns:1fr}.hint-card{align-items:flex-start;flex-direction:column}.hint-actions{align-self:flex-end}.game-tools{gap:0;justify-content:space-around}.game-tools button{min-width:48px;padding:4px}.tray-9.symbol-tray{grid-template-columns:repeat(5,minmax(44px,1fr));gap:4px}.tray-9 .symbol-button{min-width:44px;min-height:46px;border-radius:8px}.accomplishments{grid-template-columns:repeat(2,1fr)}.accomplishments div:nth-child(2){border-right:0}.accomplishments div:nth-child(-n+2){border-bottom:1px solid var(--line)}.settings-modal .switch-row{align-items:flex-start}}@media(max-width:350px){.page,.game-page{padding-left:7px;padding-right:7px}.game-progress-line{margin-bottom:6px}.symbol-tray{margin-top:8px}.symbol-button{min-height:46px}.game-tools button{min-width:44px;font-size:.68rem}.welcome-theme{width:54px;min-height:62px}.welcome-theme span{font-size:1.45rem}.welcome-theme small{font-size:.6rem}.modal-card{padding:16px;border-radius:16px}}@media(orientation:landscape)and (max-height:650px)and (min-width:700px){.game-layout{grid-template-columns:minmax(0,calc(100vh - 92px)) minmax(300px,1fr);gap:24px}.game-side-panel{display:block;margin-top:0}.game-progress-line{margin-top:0}.symbol-tray,.game-tools{max-width:calc(100vh - 92px)}}