.sudoku-app{font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,sans-serif;color:#2b2722;background:#eee8dc;font-synthesis:none;text-rendering:optimizeLegibility;--paper: #eee8dc;--surface: #fbf8f1;--ink: #2b2722;--muted: #686157;--brick: #913f30;--brick-dark: #713125;--green: #426255;--green-soft: #d9e2d4;--line: #8b8479}.sudoku-app *{box-sizing:border-box}.sudoku-app{margin:0;min-width:320px;min-height:100vh;background:var(--paper)}.sudoku-app button,.sudoku-app input{font:inherit}.sudoku-app button{color:inherit}.sudoku-app button:focus-visible,.sudoku-app input:focus-visible{outline:4px solid #c77b61;outline-offset:3px}.sudoku-app .page-shell{width:min(1320px,calc(100% - 48px));margin:0 auto;padding-bottom:48px}.sudoku-app .brand-header{min-height:78px;display:flex;align-items:center;justify-content:flex-end;border-bottom:1px solid rgba(43,39,34,.2);gap:20px}.sudoku-app .brand-lockup{display:flex;align-items:center;gap:14px;font-family:Songti SC,STSong,serif;font-weight:700;font-size:19px;white-space:nowrap}.sudoku-app .brand-mark{width:42px;height:42px;display:grid;place-items:center;background:var(--ink);color:#fff;font-family:Georgia,serif;font-size:24px}.sudoku-app .header-actions{display:flex;align-items:center;gap:18px}.sudoku-app .made-by{color:var(--muted)}.sudoku-app .text-button{border:0;background:transparent;font-weight:700;font-size:17px;padding:12px;cursor:pointer}.sudoku-app .user-chip{display:flex;align-items:center;gap:9px;border:1px solid rgba(43,39,34,.28);background:#ffffff47;border-radius:999px;padding:6px 13px 6px 7px;font-weight:700;cursor:pointer}.sudoku-app .mini-avatar{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;color:#fff}.sudoku-app .eyebrow{margin:0 0 8px;color:var(--brick);font-size:14px;font-weight:800;letter-spacing:.1em}.sudoku-app h1,.sudoku-app h2{font-family:Songti SC,STSong,serif}.sudoku-app .login-layout{min-height:calc(100vh - 126px);display:grid;grid-template-columns:1.25fr .75fr;gap:70px;align-items:center;padding:60px 0}.sudoku-app .login-layout h1{font-size:clamp(42px,5vw,70px);line-height:1.05;margin:0 0 20px}.sudoku-app .lead{font-size:22px;color:var(--muted);line-height:1.7}.sudoku-app .profile-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-top:34px}.sudoku-app .profile-card{position:relative}.sudoku-app .profile-login{width:100%;min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:11px;border:2px solid var(--ink);border-radius:8px;background:var(--surface);box-shadow:0 5px #2b272229;cursor:pointer}.sudoku-app .profile-login strong{font-size:24px}.sudoku-app .profile-login>span:last-child{color:var(--muted)}.sudoku-app .profile-avatar{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;color:#fff;font-size:34px;font-weight:800}.sudoku-app .delete-profile{position:absolute;right:8px;top:8px;border:0;background:transparent;color:#746d63;padding:8px;cursor:pointer}.sudoku-app .create-profile{background:#fbf8f1b8;border:1px solid rgba(43,39,34,.2);padding:36px}.sudoku-app .create-profile h2{font-size:30px;margin:0 0 8px}.sudoku-app .create-profile p{color:var(--muted);font-size:17px;line-height:1.6}.sudoku-app .create-profile label{display:block;font-size:18px;font-weight:700;margin:26px 0 9px}.sudoku-app .create-profile input{width:100%;min-height:60px;border:2px solid var(--ink);background:#fffdf8;padding:0 16px;font-size:22px}.sudoku-app .form-error{color:var(--brick)!important;margin:10px 0 0;font-weight:700}.sudoku-app .primary-button,.sudoku-app .secondary-button{min-height:58px;padding:0 26px;border-radius:4px;font-weight:800;font-size:18px;cursor:pointer}.sudoku-app .primary-button{border:2px solid var(--brick);background:var(--brick);color:#fff}.sudoku-app .primary-button:hover{background:var(--brick-dark)}.sudoku-app .secondary-button{border:2px solid var(--ink);background:transparent}.sudoku-app .create-profile .primary-button{width:100%;margin-top:24px}.sudoku-app .start-difficulty{min-height:calc(100vh - 110px);display:flex;flex-direction:column;justify-content:center;max-width:980px;margin:0 auto;padding:50px 0 80px}.sudoku-app .start-difficulty h1{margin:0 0 12px;font-size:clamp(42px,5vw,64px)}.sudoku-app .start-difficulty-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}.sudoku-app .start-difficulty-grid button{min-height:210px;border:2px solid var(--ink);background:var(--surface);display:flex;flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:24px;box-shadow:0 5px #2b272229;cursor:pointer}.sudoku-app .start-difficulty-grid button:hover{background:#e7dfd2;transform:translateY(-2px)}.sudoku-app .start-difficulty-grid strong{font-family:Songti SC,STSong,serif;font-size:36px}.sudoku-app .start-difficulty-grid span{color:var(--muted);font-size:18px}.sudoku-app .game-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;padding:24px 0 16px}.sudoku-app .game-heading h1{margin:0;font-size:38px;line-height:1}.sudoku-app .scoreboard{display:grid;grid-template-columns:repeat(4,minmax(92px,auto));gap:8px}.sudoku-app .scoreboard div{min-height:64px;padding:8px 14px;border-left:1px solid rgba(43,39,34,.24);display:flex;flex-direction:column}.sudoku-app .scoreboard span{color:var(--muted);font-size:14px}.sudoku-app .scoreboard strong{font-size:24px;font-variant-numeric:tabular-nums}.sudoku-app .danger{color:var(--brick)}.sudoku-app .mistake-safe{color:#32714e}.sudoku-app .mistake-failed{color:var(--brick)}.sudoku-app .game-layout{--play-size: min( calc(100dvh - 190px) , calc(100vw - 480px) , 760px);display:grid;grid-template-columns:var(--play-size) clamp(300px,28vw,390px);gap:clamp(20px,3vw,46px);align-items:stretch;justify-content:center}.sudoku-app .board-wrap{position:relative;width:var(--play-size);height:var(--play-size);min-width:0;justify-self:end}.sudoku-app .sudoku-board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));grid-template-rows:repeat(9,minmax(0,1fr));aspect-ratio:1;background:#fffdf8;border:4px solid var(--ink);box-shadow:0 18px 46px #2b27221c}.sudoku-app .sudoku-cell{position:relative;min-width:0;min-height:0;padding:0;overflow:hidden;white-space:nowrap;border:0;border-right:1px solid #aaa399;border-bottom:1px solid #aaa399;background:transparent;display:grid;place-items:center;text-align:center;font-size:clamp(22px,3.2vw,48px);line-height:1;cursor:pointer}.sudoku-app .sudoku-cell:nth-child(3n){border-right:4px solid var(--ink)}.sudoku-app .sudoku-cell:nth-child(9n){border-right:0}.sudoku-app .sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-app .sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:4px solid var(--ink)}.sudoku-app .sudoku-cell:nth-child(n+73){border-bottom:0}.sudoku-app .sudoku-cell.given{font-weight:800}.sudoku-app .sudoku-cell.editable{color:var(--brick);font-weight:750}.sudoku-app .sudoku-cell.related{background:#f1ece2}.sudoku-app .sudoku-cell.same-value{background:#e6d9ce}.sudoku-app .sudoku-cell.selected{z-index:1;background:var(--green-soft);box-shadow:inset 0 0 0 4px var(--green)}.sudoku-app .sudoku-cell.wrong{color:#fff;background:var(--brick);font-weight:900}.sudoku-app .sudoku-cell.completed-flash{z-index:2;background:#f4d7a1}.sudoku-app .pause-cover{position:absolute;top:4px;right:4px;bottom:4px;left:4px;background:#eee8dcf5;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.sudoku-app .pause-cover h2{font-size:34px;margin:0}.sudoku-app .control-panel{height:var(--play-size);min-height:0;overflow:auto;background:#fbf8f1b8;border:1px solid rgba(43,39,34,.2);padding:clamp(16px,2vw,26px);display:grid;grid-template-rows:auto auto minmax(0,1fr) auto auto;align-content:stretch}.sudoku-app .control-panel h2{font-size:28px;margin:0 0 6px}.sudoku-app .control-panel>p{color:var(--muted);font-size:17px;line-height:1.55}.sudoku-app .number-pad{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px;min-height:0}.sudoku-app .number-key{min-width:0;min-height:0;padding:0;overflow:hidden;white-space:nowrap;display:grid;place-items:center;text-align:center;border:2px solid var(--ink);border-radius:5px;background:#fffdf8;box-shadow:0 3px #2b272229;font-size:clamp(26px,3vw,40px);line-height:1;font-weight:800;cursor:pointer}.sudoku-app .number-key:hover{background:#e9e1d5}.sudoku-app .number-key.is-complete,.sudoku-app .number-key:disabled{color:#8e887f;background:#d8d1c5;border-color:#aaa399;box-shadow:none;cursor:not-allowed;opacity:.72}.sudoku-app .tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.sudoku-app .tool-grid button{min-height:46px;border:1px solid #817a70;background:#e6dfd3;border-radius:4px;font-size:16px;font-weight:700;cursor:pointer}.sudoku-app .tool-grid button:disabled{opacity:.45;cursor:not-allowed}.sudoku-app .new-game-button{width:100%;min-height:50px;border:0;border-radius:4px;background:var(--ink);color:#fff;font-size:18px;font-weight:800;margin-top:10px;cursor:pointer}.sudoku-app .frozen-note{color:var(--brick)!important;font-weight:800;padding:12px;border:1px solid #c59a91;background:#f1ded9}.sudoku-app .modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#2b272294;display:grid;place-items:center;padding:24px}.sudoku-app .modal{position:relative;width:min(620px,100%);max-height:calc(100vh - 48px);overflow:auto;background:var(--paper);border:2px solid var(--ink);box-shadow:0 24px 70px #00000047;padding:34px}.sudoku-app .modal h2{font-size:34px;margin:0 0 18px}.sudoku-app .close-button{position:absolute;right:18px;top:14px;border:0;background:transparent;font-size:38px;line-height:1;cursor:pointer}.sudoku-app .difficulty-list{display:grid;gap:12px}.sudoku-app .difficulty-list button{min-height:84px;border:2px solid var(--ink);background:#fffdf8;display:flex;justify-content:space-between;align-items:center;padding:18px 22px;cursor:pointer}.sudoku-app .difficulty-list strong{font-size:24px}.sudoku-app .difficulty-list span{color:var(--muted);font-size:17px}.sudoku-app .encouragement-modal{text-align:center}.sudoku-app .encouragement-modal>p{font-size:19px;line-height:1.7}.sudoku-app .big-score{color:var(--brick);font-family:Georgia,serif;font-size:86px;font-weight:800;line-height:1;margin:20px 0}.sudoku-app .modal-actions{display:flex;justify-content:center;gap:12px;margin-top:26px}.sudoku-app .modal-title-row{display:flex;justify-content:space-between}.sudoku-app .ranking-modal{width:min(820px,100%)}.sudoku-app .ranking-list{display:grid;gap:6px}.sudoku-app .ranking-row{display:grid;grid-template-columns:70px 1.5fr 1fr 1.35fr;gap:10px;align-items:center;min-height:54px;padding:8px 12px;background:#ffffff59;font-size:17px}.sudoku-app .ranking-row:nth-child(2),.sudoku-app .ranking-row:nth-child(3),.sudoku-app .ranking-row:nth-child(4){border-left:6px solid var(--brick)}.sudoku-app .ranking-heading{background:var(--ink);color:#fff;font-size:14px;min-height:42px}.sudoku-app .ranking-row small{display:block;color:var(--brick);font-size:12px;font-weight:700}.sudoku-app .empty-ranking{padding:50px 0;text-align:center;color:var(--muted);font-size:19px}.sudoku-app .ranking-warning{margin:0 0 12px;padding:10px 12px;border:1px solid rgba(145,63,48,.32);border-radius:8px;background:#913f3014;color:var(--brick);font-size:15px;font-weight:700}@media(max-width:980px){.sudoku-app .page-shell{width:min(100% - 28px,820px)}.sudoku-app .made-by{display:none}.sudoku-app .login-layout{grid-template-columns:1fr;gap:36px;align-items:start}.sudoku-app .start-difficulty-grid{grid-template-columns:1fr}.sudoku-app .start-difficulty-grid button{min-height:130px}.sudoku-app .game-heading{align-items:start;flex-direction:column}.sudoku-app .scoreboard{width:100%;grid-template-columns:repeat(4,1fr)}.sudoku-app .game-layout{grid-template-columns:1fr}.sudoku-app .board-wrap{width:min(100%,720px);height:auto;aspect-ratio:1;justify-self:center}.sudoku-app .control-panel{width:min(100%,720px);height:auto;justify-self:center;overflow:visible;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:none;gap:14px 20px}.sudoku-app .control-panel h2,.sudoku-app .control-panel>p,.sudoku-app .number-pad,.sudoku-app .frozen-note,.sudoku-app .new-game-button{grid-column:1 / -1}.sudoku-app .number-pad{grid-template-columns:repeat(9,1fr)}.sudoku-app .number-key{min-height:64px;font-size:30px}.sudoku-app .tool-grid{margin-top:0;grid-column:1 / -1;grid-template-columns:repeat(4,1fr)}}@media(orientation:portrait)and (max-width:1100px){.sudoku-app .page-shell{width:min(100% - 28px,820px)}.sudoku-app .game-heading{align-items:start;flex-direction:column}.sudoku-app .scoreboard{width:100%;grid-template-columns:repeat(4,1fr)}.sudoku-app .game-layout{grid-template-columns:minmax(0,1fr);gap:24px}.sudoku-app .board-wrap{width:min(100%,720px);height:auto;aspect-ratio:1;justify-self:center}.sudoku-app .control-panel{width:min(100%,720px);height:auto;justify-self:center;overflow:visible;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:none;gap:14px 20px}.sudoku-app .control-panel h2,.sudoku-app .control-panel>p,.sudoku-app .number-pad,.sudoku-app .frozen-note,.sudoku-app .new-game-button{grid-column:1 / -1}.sudoku-app .number-pad{grid-template-columns:repeat(9,minmax(0,1fr))}.sudoku-app .number-key{min-height:clamp(58px,8vw,70px);font-size:clamp(24px,4vw,36px)}.sudoku-app .tool-grid{margin-top:0;grid-column:1 / -1;grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:640px){.sudoku-app .page-shell{width:100%;padding:0 10px 30px}.sudoku-app .brand-header{min-height:66px}.sudoku-app .brand-lockup{font-size:15px;gap:9px}.sudoku-app .brand-mark{width:36px;height:36px;font-size:21px}.sudoku-app .header-actions{gap:2px}.sudoku-app .text-button{font-size:15px;padding:10px 6px}.sudoku-app .user-chip{padding-right:8px}.sudoku-app .user-chip>span:last-child{display:none}.sudoku-app .login-layout{padding:38px 4px}.sudoku-app .login-layout h1{font-size:42px}.sudoku-app .lead{font-size:19px}.sudoku-app .create-profile{padding:26px 20px}.sudoku-app .game-heading{padding:14px 2px 12px;gap:12px}.sudoku-app .game-heading h1{font-size:31px}.sudoku-app .scoreboard{gap:3px}.sudoku-app .scoreboard div{min-height:55px;padding:6px 8px}.sudoku-app .scoreboard span{font-size:12px}.sudoku-app .scoreboard strong{font-size:19px}.sudoku-app .game-layout{gap:16px}.sudoku-app .board-wrap{width:100%;height:auto}.sudoku-app .sudoku-board{width:100%;border-width:3px}.sudoku-app .sudoku-cell{min-height:0;padding:0;font-size:clamp(20px,7vw,34px)}.sudoku-app .sudoku-cell:nth-child(3n){border-right-width:3px}.sudoku-app .sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-app .sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom-width:3px}.sudoku-app .control-panel{width:100%;padding:18px 12px;display:block}.sudoku-app .control-panel h2{font-size:26px}.sudoku-app .control-panel>p{margin-bottom:12px}.sudoku-app .number-pad{grid-template-columns:repeat(3,1fr)}.sudoku-app .number-key{min-height:clamp(62px,18vw,76px);font-size:clamp(28px,9vw,40px)}.sudoku-app .tool-grid{grid-template-columns:1fr 1fr;margin-top:16px}.sudoku-app .ranking-row{grid-template-columns:38px 1.2fr .8fr 1.4fr;gap:6px;font-size:13px}.sudoku-app .modal{padding:30px 20px}.sudoku-app .modal-actions{flex-direction:column}}@media(orientation:landscape)and (max-height:600px){.sudoku-app .page-shell{width:calc(100% - 20px);padding-bottom:10px}.sudoku-app .brand-header{min-height:48px}.sudoku-app .brand-mark{width:32px;height:32px;font-size:19px}.sudoku-app .brand-lockup{font-size:14px}.sudoku-app .made-by{display:none}.sudoku-app .game-heading{min-height:54px;padding:6px 0 8px;flex-direction:row;align-items:end}.sudoku-app .game-heading h1{font-size:27px}.sudoku-app .game-heading .eyebrow{margin-bottom:3px;font-size:11px}.sudoku-app .scoreboard{width:auto;grid-template-columns:repeat(4,minmax(68px,auto))}.sudoku-app .scoreboard div{min-height:45px;padding:3px 8px}.sudoku-app .scoreboard span{font-size:11px}.sudoku-app .scoreboard strong{font-size:17px}.sudoku-app .game-layout{--play-size: min( calc(100dvh - 118px) , calc(100vw - 330px) , 360px);grid-template-columns:var(--play-size) minmax(245px,285px);gap:16px;align-items:stretch}.sudoku-app .board-wrap{width:var(--play-size);height:var(--play-size);aspect-ratio:auto;justify-self:end}.sudoku-app .control-panel{width:auto;height:var(--play-size);padding:10px 12px;overflow:hidden;display:grid;grid-template-columns:none;grid-template-rows:auto minmax(0,1fr) auto auto;gap:0}.sudoku-app .control-panel h2{font-size:21px;margin:0 0 4px}.sudoku-app .control-panel>p{display:none}.sudoku-app .number-pad{grid-column:auto;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,minmax(0,1fr));gap:6px;margin:0}.sudoku-app .sudoku-cell{font-size:clamp(17px,5.8dvh,26px)}.sudoku-app .number-key{min-height:0;font-size:clamp(20px,6.5dvh,25px);box-shadow:0 2px #2b272229}.sudoku-app .tool-grid{grid-column:auto;grid-template-columns:repeat(4,1fr);gap:5px;margin-top:7px}.sudoku-app .tool-grid button{min-height:34px;padding:2px;font-size:12px}.sudoku-app .new-game-button{grid-column:auto;min-height:36px;margin-top:6px;font-size:14px}.sudoku-app .frozen-note{display:none}}@media(max-width:430px)and (orientation:portrait){.sudoku-app .brand-header{min-height:58px}.sudoku-app .brand-lockup{font-size:14px}.sudoku-app .brand-mark{width:32px;height:32px;font-size:19px}.sudoku-app .game-heading h1{font-size:28px}.sudoku-app .eyebrow{margin-bottom:4px;font-size:12px}.sudoku-app .scoreboard div{min-height:50px;padding:5px 6px}.sudoku-app .scoreboard strong{font-size:18px}.sudoku-app .control-panel{border-left:0;border-right:0}}.sudoku-app--playing{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;width:100vw;height:100dvh;min-height:100dvh;overflow:hidden}.sudoku-app--playing .game-shell{width:100%;max-width:none;height:100dvh;padding:clamp(6px,1.2dvh,12px) clamp(8px,1.4vw,18px);overflow:hidden}.sudoku-app--playing .game-shell main{height:100%;min-height:0;display:grid;grid-template-rows:auto auto minmax(0,1fr)}.sudoku-app--playing .game-shell--window main{grid-template-rows:auto minmax(0,1fr)}.sudoku-app .game-toolbar{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid rgba(43,39,34,.18)}.sudoku-app .game-brand{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:clamp(13px,1.4vw,16px);font-weight:800;white-space:nowrap}.sudoku-app .game-brand span{width:26px;height:26px;display:grid;place-items:center;background:var(--ink);color:#fff;font-family:Georgia,serif}.sudoku-app .game-toolbar-actions{display:flex;align-items:center;gap:8px;min-width:0}.sudoku-app .window-close-button{width:42px;height:42px;border:2px solid var(--ink);border-radius:50%;background:var(--surface);color:var(--brick);display:grid;place-items:center;font-size:30px;line-height:1;font-weight:900;cursor:pointer}.sudoku-app .window-close-button:hover{background:#eaded0}.sudoku-app .compact-user-chip{min-height:34px;padding-block:3px}.sudoku-app--playing .game-heading{min-height:58px;padding:7px 0 8px;align-items:center}.sudoku-app--playing .game-heading h1{font-size:clamp(24px,3.2dvh,34px)}.sudoku-app--playing .eyebrow{margin-bottom:3px;font-size:clamp(11px,1.8dvh,14px)}.sudoku-app--playing .scoreboard{grid-template-columns:repeat(4,minmax(68px,auto));gap:4px}.sudoku-app--playing .scoreboard div{min-height:46px;padding:4px 9px}.sudoku-app--playing .scoreboard span{font-size:clamp(10px,1.5dvh,12px)}.sudoku-app--playing .scoreboard strong{font-size:clamp(16px,2.8dvh,22px)}.sudoku-app--playing .game-layout{--play-size: min( calc(100dvh - 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