@charset "UTF-8";
:root{--paper:#f3f5f9;--white:#fff;--ink:#26334b;--muted:#6e7890;--purple:#5750a2;--light:#eeedf8;--line:#dee3ed;--grid:#8c96ab;--red:#b5334c;--red-light:#fbe9ee;--display:"Avenir Next","Trebuchet MS","PingFang SC","Microsoft YaHei",sans-serif;--body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--numbers:"Avenir Next","Trebuchet MS",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);-webkit-font-smoothing:antialiased}button,a,input{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.4}button{border:0;background:none}a{color:inherit;text-decoration:none}svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}:focus-visible{outline:3px solid #938bd0;outline-offset:4px}button{transition:background .16s,color .16s,transform .16s}button:active:not(:disabled){transform:translateY(1px)}[hidden]{display:none!important}
.site-header{max-width:1100px;margin:auto;padding:28px 36px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-family:var(--display);font-size:22px;font-weight:600;letter-spacing:-.6px}.brand>svg{width:29px;height:29px;color:var(--purple)}.brand-divider{color:#b3b9c9;padding:0 15px;font-weight:400}.brand-section{font-size:15px;letter-spacing:2px;font-weight:500}.back-link{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--muted)}.back-link:hover{color:var(--purple)}.back-link svg{width:16px;height:16px}main{max-width:972px;margin:auto;padding:0 32px}.intro{padding:42px 2px 32px;display:flex;align-items:center;justify-content:space-between}.eyebrow{margin:0 0 13px;font-size:10px;letter-spacing:2.4px;font-family:var(--numbers);font-weight:600;color:var(--purple)}h1{font-family:var(--display);margin:0;font-size:34px;line-height:1.4;font-weight:600;letter-spacing:1px}h1 span{color:var(--muted);font-weight:400}.intro-copy{margin:12px 0 0;color:var(--muted);font-size:14px;letter-spacing:.5px}.intro-mark{display:grid;grid-template-columns:repeat(3,1fr);width:100px;height:100px;transform:rotate(8deg);font-family:var(--numbers);font-size:14px;color:#a7aabe;margin-right:16px}.intro-mark span{display:grid;place-items:center;border-right:1px solid #d1d5e1;border-bottom:1px solid #d1d5e1}.intro-mark span:nth-child(3n){border-right:0}.intro-mark span:nth-child(n+7){border-bottom:0}.intro-mark .mark-center{background:var(--purple);color:#fff;border:0;border-radius:5px;transform:rotate(-8deg);box-shadow:4px 6px 12px #5750a21a}
.game{background:var(--white);border:1px solid var(--line);border-radius:20px;box-shadow:0 12px 40px #29324705;overflow:hidden}.level-bar{display:flex;align-items:center;padding:20px 28px;border-bottom:1px solid var(--line);gap:25px}.level-label{color:var(--muted);font-size:12px;letter-spacing:2px}.levels{display:grid;grid-template-columns:repeat(5,1fr);flex:1;gap:8px}.level-button{padding:10px 8px;border-radius:9px;display:flex;justify-content:center;align-items:center;gap:10px;border:1px solid transparent;font-size:14px}.level-button small{font-size:10px;color:var(--muted)}.level-button:hover{background:var(--paper)}.level-button[aria-pressed=true]{background:var(--light);color:var(--purple);border-color:#dcd8ee;font-weight:600}.level-button[aria-pressed=true] small{color:var(--purple);font-weight:400}.game-content{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:42px;padding:24px 32px 0}.board-column{min-width:0}.board-meta{display:flex;align-items:center;justify-content:space-between;height:34px;margin-bottom:12px;font-size:12px;color:var(--muted)}.level-name{font-weight:600;color:var(--ink);font-size:14px}.meta-divider{margin:0 10px;color:#b4bac6}.clock{display:flex;align-items:center;gap:8px}.clock time{font-family:var(--numbers);font-size:17px;font-variant-numeric:tabular-nums;color:var(--ink);min-width:48px}.icon-button{display:grid;place-items:center;width:32px;height:32px;border-radius:6px;color:var(--muted)}.icon-button:hover{background:var(--light);color:var(--purple)}.icon-button svg{height:15px;width:15px;stroke-width:2}
.board-wrap{position:relative;aspect-ratio:1/1;border:2px solid var(--grid);border-radius:5px;overflow:hidden;background:white}.board{width:100%;height:100%;display:grid;grid-template-rows:repeat(9,1fr);user-select:none}.board-row{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));min-height:0}.cell{position:relative;display:grid;place-items:center;border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:0;font-family:var(--numbers);font-variant-numeric:tabular-nums;font-size:clamp(23px,2.7vw,32px);line-height:1;color:var(--purple);border-radius:0;font-weight:500;min-width:0;min-height:0}.cell:nth-child(3n){border-right:2px solid var(--grid)}.cell:last-child{border-right:0}.board-row:nth-child(3n) .cell{border-bottom:2px solid var(--grid)}.board-row:last-child .cell{border-bottom:0}.cell.given{color:var(--ink);font-weight:600}.cell.related{background:#f3f4f9}.cell.same{background:#e8e5f7;color:#454080}.cell.selected{background:#d7d2f0;box-shadow:inset 0 0 0 2px var(--purple);z-index:1}.cell:focus-visible{outline:0;box-shadow:inset 0 0 0 3px var(--purple);z-index:2}.cell.error{color:var(--red);background:var(--red-light)}.cell.error:after{content:"";position:absolute;width:4px;height:4px;bottom:5px;left:calc(50% - 2px);border-radius:50%;background:var(--red)}.cell.hinted{box-shadow:inset 0 0 0 2px #b08d3f;background:#faf2da}.cell .pencil-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);position:absolute;inset:4px;font-size:11px;font-weight:400;line-height:1;color:#67618b}.pencil-grid span{display:grid;place-items:center}.board-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:15px;font-size:10px;color:var(--muted)}.status-dot{display:inline-block;background:#79a895;width:5px;height:5px;border-radius:50%;margin-right:6px}.board-wrap.is-paused .board{visibility:hidden}.board-overlay{position:absolute;inset:0;background:#f7f7fc;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center}.pause-symbol{display:grid;place-items:center;width:58px;height:58px;background:#eeedf8;border-radius:15px;color:var(--purple);margin-bottom:13px}.pause-symbol svg{width:30px;height:30px}.board-overlay h2{font-size:22px;font-weight:500;letter-spacing:1px;margin:8px 0}.board-overlay p{font-size:12px;color:var(--muted);margin:8px 0 23px}.board-overlay .primary{width:auto;min-width:150px}.controls{padding-top:6px}.control-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-bottom:15px;color:var(--muted)}.key-hint{font-family:var(--numbers);font-size:10px;color:#969dad}.numpad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.number{height:62px;background:#f4f5fa;border:1px solid #e9eaf1;border-radius:9px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;font-family:var(--numbers);color:var(--purple)}.number strong{font-size:27px;font-weight:500;line-height:1}.number small{font-size:9px;color:#9298ac;font-weight:400;line-height:1}.number:hover:not(:disabled){background:#e9e6f7;border-color:#c9c3e2}.number:disabled{opacity:.35}.numpad.is-notes .number{border-style:dashed;background:var(--light)}.tools{display:grid;grid-template-columns:repeat(4,1fr);margin:20px -7px 17px;gap:3px}.tools button{position:relative;display:flex;align-items:center;flex-direction:column;gap:9px;font-size:11px;padding:10px 3px;border-radius:8px;color:var(--muted)}.tools button svg{width:20px;height:20px}.tools button:hover,.tools button[aria-pressed=true]{background:var(--light);color:var(--purple)}.tool-dot{position:absolute;top:7px;right:12px;width:5px;height:5px;border-radius:50%;background:var(--purple);display:none}.tools button[aria-pressed=true] .tool-dot{display:block}.hint-button{display:flex;align-items:center;width:100%;padding:12px 14px;border:1px solid #e1deef;border-radius:8px;gap:10px;color:var(--purple);font-size:12px}.hint-button svg{width:18px;height:18px}.hint-button:hover{background:var(--light)}.hint-arrow{margin-left:auto;font-size:17px}.new-game-area{margin-top:22px}.primary{width:100%;display:flex;justify-content:center;align-items:center;gap:9px;border:1px solid var(--purple);border-radius:9px;background:var(--purple);color:#fff;font-size:13px;min-height:44px;padding:12px 18px}.primary svg{width:17px;height:17px}.primary:hover{background:#48418c;border-color:#48418c}.text-button{display:block;margin:9px auto 0;padding:6px 12px;color:var(--muted);font-size:11px}.text-button:hover{color:var(--purple)}.level-description{font-size:11px;color:var(--muted);line-height:1.9;margin:21px 0 15px}.best-record{display:flex;justify-content:space-between;padding-top:12px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}.best-record strong{font-family:var(--numbers);font-size:12px;font-weight:500;color:var(--purple);font-variant-numeric:tabular-nums}.notice{font-size:12px;line-height:1.6;color:var(--muted);min-height:56px;display:flex;align-items:center;margin:0 32px;padding:12px 0;max-width:600px}.notice[data-tone=error]{color:var(--red)}.notice[data-tone=success]{color:#36785e}
.how-to{margin:25px 3px 0;border-bottom:1px solid var(--line)}.how-to summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;list-style:none;font-size:13px;padding:0 0 22px}.how-to summary::-webkit-details-marker{display:none}.summary-right{color:var(--muted);font-size:11px;display:flex;gap:24px;align-items:center}.summary-right>span{font-size:17px}.how-to[open] .summary-right>span{transform:rotate(45deg)}.rules-content{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;padding-bottom:20px}.rules-content h2{font-size:12px;font-weight:500}.rules-content p{font-size:11px;line-height:1.9;color:var(--muted)}kbd{font:10px var(--body)}.site-footer{display:flex;justify-content:space-between;gap:15px;padding:24px 3px 32px;font-size:10px;color:#8790a2;letter-spacing:.5px}dialog{width:min(420px,calc(100vw - 40px));border:1px solid var(--line);border-radius:18px;padding:32px;color:var(--ink);box-shadow:0 24px 80px #22284026}dialog::backdrop{background:#29324760;backdrop-filter:blur(3px)}.dialog-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:12px;color:var(--purple);background:var(--light);margin-bottom:22px}dialog h2{font-size:24px;font-weight:500;line-height:1.4;margin:0 0 15px}#dialog-copy{font-size:13px;line-height:1.9;color:var(--muted);white-space:pre-line}.dialog-actions{display:flex;gap:12px;margin-top:26px}.dialog-actions button{flex:1}.secondary{padding:12px;border:1px solid var(--line);border-radius:9px;font-size:13px;background:#f6f7fa}.secondary:hover{background:var(--light)}.noscript{position:fixed;inset:auto 12px 12px;background:white;padding:20px;border:1px solid var(--purple);z-index:100}
@media(min-width:1100px){.board-wrap{max-width:540px}.game-content{gap:44px}.cell{font-size:32px}}
@media(max-width:850px){.game-content{grid-template-columns:minmax(0,1fr) 225px;gap:25px;padding:20px 24px 0}.level-bar{padding:16px 20px;gap:12px}.level-button{gap:5px}.level-button small{display:none}.number{height:54px}.controls{padding-top:5px}.tools{margin:14px -5px}.new-game-area{margin-top:15px}.level-description{margin-top:15px}.best-record{padding-top:8px}.notice{margin:0 24px}.cell .pencil-grid{font-size:9px;inset:3px}.board-foot{font-size:9px}}
@media(max-width:650px){.site-header{padding:19px 20px}.brand{font-size:20px;gap:9px}.brand>svg{width:25px;height:25px}.brand-divider{padding:0 10px}.brand-section{font-size:13px}.back-link{font-size:11px;gap:6px}main{padding:0 16px;max-width:510px}.intro{padding:26px 3px 22px}.eyebrow{font-size:8px;letter-spacing:1.7px;margin-bottom:8px}h1{font-size:25px;letter-spacing:.4px}.intro-copy{font-size:11px;margin-top:9px;letter-spacing:0}.intro-mark{width:65px;height:65px;margin-right:3px;font-size:10px}.game{border-radius:15px}.level-bar{padding:12px 11px;gap:0}.level-label{display:none}.levels{gap:4px}.level-button{font-size:12px;padding:9px 3px;border-radius:7px}.game-content{display:flex;flex-direction:column;gap:20px;padding:12px 14px 0}.board-meta{margin-bottom:8px;height:29px;font-size:11px}.level-name{font-size:12px}.clock time{font-size:15px}.cell{font-size:clamp(23px,6.4vw,30px)}.cell .pencil-grid{font-size:clamp(8px,2.2vw,11px);inset:3px}.board-foot{margin-top:10px;font-size:9px}.controls{display:grid;padding:0;grid-template-columns:1fr 1fr;column-gap:12px}.control-heading{display:none}.numpad{grid-column:1/-1;grid-template-columns:repeat(9,1fr);gap:4px}.number{height:48px;border-radius:6px;gap:4px}.number strong{font-size:23px}.number small{font-size:8px}.tools{grid-column:1/-1;margin:9px -2px 12px;gap:8px}.tools button{flex-direction:row;justify-content:center;padding:11px 2px;gap:7px;font-size:11px}.tools button svg{width:17px;height:17px}.tool-dot{right:4px;top:7px}.hint-button{align-self:start;min-height:42px;padding:10px;gap:7px;font-size:11px}.hint-arrow{display:none}.hint-button svg{width:16px;height:16px}.new-game-area{margin:0}.primary{min-height:42px;font-size:12px;padding:10px 14px}.text-button{font-size:10px;margin-top:7px;padding:5px 10px}.level-description{grid-column:1/-1;font-size:10px;line-height:1.7;margin:11px 0 0}.best-record{display:none}.notice{min-height:47px;margin:0 14px;font-size:10px;padding:9px 0}.how-to{margin:21px 3px 0}.how-to summary{font-size:11px;padding-bottom:19px}.summary-right{font-size:10px;gap:10px}.rules-content{grid-template-columns:1fr;gap:5px}.site-footer{font-size:9px;padding:20px 3px 26px;letter-spacing:0}dialog{padding:25px}.board-overlay h2{font-size:20px}}
@media(max-width:360px){.intro-mark{display:none}.intro{padding-top:20px}h1{font-size:24px}main{padding:0 10px}.game-content{padding-left:10px;padding-right:10px}.tools button{gap:5px}.number strong{font-size:21px}.hint-arrow{display:none}.meta-divider{margin:0 6px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}