:root{color-scheme:light;--bg:#fff;--surface:#fff;--text:#171717;--muted:#777;--gold:#c39a3d;--gold-dark:#967124;--gold-light:#f8f1df;--line:#e9e6df;--soft:#f8f7f4;--danger:#c73535;--success:#24834b;--cell:#fff;--selected:#f5e7bf;--related:#faf5e7;--fixed:#252525;--user:#9a7321;--shadow:0 8px 30px rgba(25,22,15,.055);--radius:18px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}html{min-height:100%;background:var(--bg);scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;min-height:100dvh;background:var(--bg);color:var(--text);display:flex;flex-direction:column}button,input{font:inherit}button{color:inherit;touch-action:manipulation}.sudoku-cell:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--gold);outline-offset:3px}button:disabled{opacity:.42;cursor:not-allowed}.app-header{height:76px;width:100%;max-width:1160px;margin:0 auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;gap:11px;color:var(--text);text-decoration:none}.brand-logo{width:43px;height:43px;object-fit:contain}.brand-name{font-size:17px;font-weight:850;letter-spacing:1.4px;line-height:1.2}.brand-subtitle{display:block;margin-top:4px;color:var(--gold-dark);font-size:10px;font-weight:750;letter-spacing:3px}.icon-btn{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line);border-radius:13px;background:var(--surface);font-size:23px;cursor:pointer}.app-main{width:100%;max-width:1100px;margin:0 auto;padding:42px 28px 54px;flex:1}.screen[hidden],[hidden]{display:none!important}.hero{padding:20px 0 34px;text-align:center}.eyebrow{display:inline-block;color:var(--gold-dark);font-size:11px;font-weight:800;letter-spacing:2.3px}.complete-screen h1,.hero h1,.stats-screen h1{margin:15px 0 12px;font-size:clamp(32px,5vw,48px);line-height:1.12;letter-spacing:-1.8px;font-weight:800}.hero p,.stats-screen>p{max-width:490px;margin:0 auto;color:var(--muted);font-size:15px;line-height:1.8}.level-section{max-width:740px;margin:0 auto}.level-section h2{margin:0 0 16px;font-size:17px;font-weight:750}.level-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.level-card{min-height:136px;padding:21px 18px;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between;gap:14px;text-align:left;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);cursor:pointer;transition:border-color .2s,transform .2s,background .2s}.level-card:hover{border-color:var(--gold);transform:translateY(-3px)}.level-symbol{width:36px;height:36px;display:grid;place-items:center;border-radius:11px;background:var(--gold-light);color:var(--gold-dark);font-size:23px}.level-copy{display:grid;gap:5px}.level-copy strong{font-size:17px}.level-copy small{color:var(--muted);font-size:12px}.level-arrow{align-self:flex-end;margin-top:-35px;color:var(--gold-dark);font-size:21px}.progress-panel{max-width:740px;margin:28px auto 0;padding:21px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--soft)}.progress-panel>div{display:grid;gap:8px}.progress-label,.side-label{color:var(--muted);font-size:10px;font-weight:800;letter-spacing:1.2px}.progress-panel>div>strong{font-size:25px;font-weight:800}.primary-btn,.secondary-btn{min-height:47px;padding:12px 20px;border-radius:12px;font-size:14px;font-weight:750;cursor:pointer;transition:background .2s,border-color .2s,transform .2s}.primary-btn{border:1px solid #171717;background:#171717;color:#fff}.primary-btn:hover{background:#343434;transform:translateY(-1px)}.secondary-btn{border:1px solid #d9c38e;background:var(--gold-light);color:#654b16}.secondary-btn:hover{background:#f0e1b9}.text-btn{padding:9px 11px;border:0;border-radius:9px;background:0 0;color:var(--muted);font-size:13px;font-weight:650;cursor:pointer}.text-btn:hover{background:var(--soft);color:var(--text)}.game-topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:24px}.game-topbar .text-btn{padding:9px 4px}.level-badge{padding:7px 11px;border:1px solid #e3d1a3;border-radius:99px;background:var(--gold-light);color:#775b1d;font-size:10px;font-weight:850;letter-spacing:1.3px}.game-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}.game-heading h1{margin:0 0 7px;font-size:clamp(25px,4vw,33px);letter-spacing:-.8px}.game-heading p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}.timer-box{min-width:91px;padding:10px 12px;display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);border-radius:12px;background:var(--soft);font-size:14px;font-weight:750;font-variant-numeric:tabular-nums}.game-layout{display:grid;grid-template-columns:minmax(0,590px) minmax(190px,1fr);align-items:start;gap:28px}.board-wrap{width:100%;max-width:590px;margin:0 auto}.sudoku-board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(9,minmax(0,1fr));grid-template-rows:repeat(9,minmax(0,1fr));border:2px solid #292929;border-radius:3px;overflow:hidden;background:var(--cell);user-select:none;-webkit-user-select:none;touch-action:manipulation}.sudoku-cell{position:relative;min-width:0;min-height:0;padding:0;display:flex;align-items:center;justify-content:center;border:0;border-right:1px solid #d8d8d8;border-bottom:1px solid #d8d8d8;border-radius:0;background:var(--cell);color:var(--user);font-size:clamp(14px,3.4vw,25px);font-weight:550;cursor:pointer;overflow:hidden}.sudoku-cell:nth-child(9n){border-right:0}.sudoku-cell:nth-child(n+73){border-bottom:0}.sudoku-cell:nth-child(3n):not(:nth-child(9n)){border-right:2px solid #444}.sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid #444}.sudoku-cell.is-fixed{color:var(--fixed);font-weight:800}.sudoku-cell.is-related{background:var(--related)}.sudoku-cell.is-selected{z-index:1;background:var(--selected);box-shadow:inset 0 0 0 2px var(--gold)}.sudoku-cell.is-same-number{background:#f1e4c1}.sudoku-cell.is-error{background:#fde4e4!important;color:var(--danger)!important}.sudoku-cell.is-hinted{background:#e1f4e6!important;color:var(--success)!important}.sudoku-cell.is-correct{color:var(--success)}.sudoku-cell.is-fixed.is-same-number{background:#f1e4c1}.cell-notes{position:absolute;inset:2px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);align-items:center;justify-items:center;color:#777;font-size:clamp(6px,1.5vw,10px);line-height:1}.cell-notes span{display:grid;place-items:center}.board-help{margin:12px 0 6px;text-align:center;color:var(--muted);font-size:11px;line-height:1.6}.game-message{min-height:20px;margin:5px 0;text-align:center;color:var(--gold-dark);font-size:12px;font-weight:650}.game-tools{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-top:12px}.tool-btn{min-height:64px;padding:8px 4px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--line);border-radius:12px;background:var(--surface);font-size:22px;cursor:pointer}.tool-btn span{font-size:11px;font-weight:650}.tool-btn:hover,.tool-btn[aria-pressed=true]{border-color:var(--gold);background:var(--gold-light);color:#795b1b}.number-pad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:5px;margin-top:15px}.number-btn{min-width:0;min-height:49px;padding:4px 0;border:1px solid var(--line);border-radius:9px;background:var(--soft);color:var(--text);font-size:clamp(15px,3vw,21px);font-weight:700;cursor:pointer}.number-btn:hover{border-color:var(--gold);background:var(--gold-light)}.number-btn.is-complete{opacity:.35}.game-options{margin-top:14px;display:flex;align-items:center;justify-content:space-between;gap:8px}.toggle-option{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;cursor:pointer}.toggle-option input{width:16px;height:16px;accent-color:var(--gold-dark)}.game-side-panel{display:grid;gap:14px}.side-card{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.side-card>strong{display:block;margin-top:12px;font-size:23px}.side-card p{margin:10px 0 0;color:var(--muted);font-size:12px;line-height:1.8}.mini-progress{height:5px;margin-top:15px;overflow:hidden;border-radius:9px;background:#ece9e2}.mini-progress span{display:block;width:0;height:100%;border-radius:9px;background:var(--gold);transition:width .2s}.complete-screen{max-width:550px;margin:15px auto;text-align:center}.completion-mark{width:74px;height:74px;margin:0 auto 22px;display:grid;place-items:center;border:1px solid #d8c187;border-radius:50%;background:var(--gold-light);color:#947124;font-size:36px;font-weight:700}.complete-screen h1{font-size:clamp(32px,5vw,44px)}.complete-screen>p,.stats-screen>p{color:var(--muted);font-size:14px;line-height:1.8}.completion-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:27px 0;padding:20px 10px;border:1px solid var(--line);border-radius:var(--radius);background:var(--soft)}.completion-stats>div{display:grid;gap:8px}.completion-stats span{color:var(--muted);font-size:10px;font-weight:800;letter-spacing:1px}.completion-stats strong{font-size:20px}.level-progress{display:flex;justify-content:center;gap:10px;margin:0 0 26px}.level-progress span{padding:8px 13px;border:1px solid var(--line);border-radius:30px;color:var(--muted);font-size:11px;font-weight:750}.level-progress span.is-complete{border-color:#c4dfcb;background:#e8f5eb;color:var(--success)}.level-progress 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span:first-child{color:#171717;font-size:12px;font-weight:850;letter-spacing:2px}.app-footer span:last-child{font-size:10px;letter-spacing:.2px}.install-fab{position:fixed;z-index:20;right:20px;bottom:calc(20px + env(safe-area-inset-bottom));min-height:49px;padding:0 18px;display:flex;align-items:center;justify-content:center;gap:9px;border:1px solid #171717;border-radius:99px;background:#171717;color:#fff;box-shadow:0 7px 25px #0002;font-size:13px;font-weight:750;cursor:pointer;animation:.25s ease-out fab-in}.install-fab>span:first-child{color:#e1bd69;font-size:21px}.install-fab:hover{background:#333}.app-dialog{width:min(420px,calc(100% - 32px));padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--text);box-shadow:0 25px 100px #0003}.app-dialog::backdrop{background:#0006;backdrop-filter:blur(3px)}.app-dialog h2{margin:0 0 12px;font-size:21px}.app-dialog p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:24px}.toast{position:fixed;z-index:30;left:50%;bottom:calc(85px + env(safe-area-inset-bottom));max-width:calc(100% - 32px);padding:12px 18px;transform:translateX(-50%);border:1px solid #373737;border-radius:12px;background:#171717;color:#fff;text-align:center;font-size:13px;box-shadow:0 8px 25px #0002;animation:.2s ease-out toast-in}.toast[hidden]{display:none}@keyframes fab-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes toast-in{from{opacity:0;transform:translate(-50%,8px)}to{opacity:1;transform:translate(-50%,0)}}@media(min-width:900px){.app-main{padding-top:52px}.home-screen{padding-top:12px}.game-layout{grid-template-columns:minmax(0,590px) minmax(210px,1fr);gap:35px}.board-wrap{max-width:590px}}@media(max-width:700px){.app-header{height:66px;padding:0 17px}.brand-logo{width:37px;height:37px}.brand-name{font-size:15px}.app-main{padding:25px 16px 35px}.hero{padding:22px 0 28px}.hero h1{font-size:clamp(30px,8vw,40px);letter-spacing:-1.2px}.hero p{font-size:13px}.level-list{grid-template-columns:1fr;gap:10px}.level-card{min-height:83px;padding:14px 15px;display:grid;grid-template-columns:39px minmax(0,1fr) auto;align-items:center;justify-content:initial;gap:12px}.level-symbol{width:35px;height:35px}.level-arrow{align-self:center;margin:0}.level-copy strong{font-size:15px}.progress-panel{margin-top:20px;padding:17px 14px;gap:10px;flex-wrap:wrap}.progress-label{font-size:9px;letter-spacing:.6px}.progress-panel>div>strong{font-size:22px}.progress-panel .secondary-btn{width:100%}.game-topbar{margin-bottom:20px}.game-topbar .text-btn{font-size:12px}.game-heading{margin-bottom:17px}.game-heading h1{font-size:27px}.game-heading p{max-width:245px;font-size:11px}.timer-box{min-width:76px;padding:9px;font-size:12px}.game-layout{grid-template-columns:minmax(0,1fr);gap:16px}.board-wrap{max-width:540px}.sudoku-cell{font-size:clamp(14px,5vw,24px)}.cell-notes{font-size:clamp(6px,1.8vw,10px)}.game-side-panel{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.side-card{padding:14px}.side-card>strong{font-size:20px}.side-card p{font-size:11px}.number-pad{gap:4px}.number-btn{min-height:43px;border-radius:7px}.tool-btn{min-height:58px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat-card{min-height:90px;padding:14px}.stat-card strong{font-size:23px}.install-fab{right:14px;bottom:calc(14px + env(safe-area-inset-bottom));min-height:45px;padding:0 15px}.app-footer{padding-top:17px}}@media(max-width:380px){.app-main{padding-right:11px;padding-left:11px}.game-topbar{gap:3px}.game-topbar .text-btn{font-size:11px}.level-badge{padding:6px 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