@charset "UTF-8";
:root{color-scheme:light;--bg:#f4f6fa;--surface:#fff;--ink:#27364a;--muted:#728097;--line:#dae1ec;--blue:#3478e5;--blue-dark:#185cc3;--blue-light:#eaf2ff;--grid:#33455e;--warm:#eeaa54;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR",sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.5;-webkit-tap-highlight-color:transparent}button,a,input{touch-action:manipulation}button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}a{color:inherit;text-decoration:none}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #83b4ff;outline-offset:3px}svg{width:24px;height:24px;flex-shrink:0}h1,h2,p{margin:0}button svg{vertical-align:middle}[hidden]{display:none!important}.shell{width:min(100%,520px);margin:32px auto;padding:0 22px 24px;background:var(--surface);border:1px solid #e7ebf1;border-radius:24px;box-shadow:0 16px 60px #20385a07;min-height:650px}.app-header{height:80px;display:flex;align-items:center;justify-content:space-between;gap:12px}.app-header h1{font-size:23px;letter-spacing:-.8px;font-weight:750}.header-start{display:flex;align-items:center;gap:10px}.icon-button{width:42px;height:42px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:#697b94}.icon-button:hover{background:var(--bg)}.brand-mark{display:flex;padding:9px;background:var(--blue);color:white;border-radius:12px}.eyebrow{color:var(--muted);font-size:13px;font-weight:600;letter-spacing:.05em}.home{padding-top:24px}.home h2{font-size:28px;letter-spacing:-1.1px;line-height:1.5;margin:3px 0 22px}.home-cards{display:grid;gap:18px}.game-card{display:block;border:1px solid var(--line);border-radius:20px;overflow:hidden;transition:transform .2s,box-shadow .2s}.game-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #1c3e7310}.card-art{height:196px;background:#edf3fd;display:flex;align-items:center;justify-content:center}.card-art.warm{background:#faf3e8}.mini-sudoku{display:grid;grid-template-columns:repeat(6,25px);width:152px;border:1px solid #7e96b9;transform:rotate(-6deg);background:white;box-shadow:8px 12px 0 #cad9f0}.mini-sudoku span{height:25px;border-right:1px solid #d6dfed;border-bottom:1px solid #d6dfed;text-align:center;line-height:25px;font-size:14px;color:#465c7f}.mini-sudoku span:nth-child(3n){border-right:1px solid #7e96b9}.mini-sudoku span:nth-child(n+13):nth-child(-n+18){border-bottom:1px solid #7e96b9}.mini-2048{display:grid;grid-template-columns:repeat(3,43px);gap:5px;padding:6px;background:#b9afa2;border-radius:7px;transform:rotate(6deg);box-shadow:7px 12px 0 #eadcc7}.mini-2048 span{background:#ede3d5;border-radius:4px;line-height:43px;text-align:center;font-size:23px;font-weight:750;color:#776d63}.mini-2048 span:nth-child(3n){background:#eda75f;color:white}.mini-2048 span:last-child{background:#e9bd4b;color:white}.card-info{padding:18px 20px;display:flex;align-items:center;justify-content:space-between}.card-title{font-size:21px;font-weight:750;letter-spacing:-.5px}.card-sub{color:var(--muted);font-size:14px;margin-top:4px}.card-arrow{background:var(--blue-light);color:var(--blue);width:36px;height:36px;display:grid;place-items:center;border-radius:50%}.warm-arrow{background:#fbf0df;color:#b47b35}.home-note{color:var(--muted);font-size:13px;text-align:center;margin:24px 0 0}.footer{display:flex;justify-content:center;gap:20px;margin-top:25px;color:var(--muted);font-size:13px}.footer button{font-size:13px;padding:4px}.game-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px;font-size:14px;color:var(--muted)}.difficulty-label{color:var(--ink);font-weight:650}.timer{display:flex;align-items:center;gap:6px;font-variant-numeric:tabular-nums}.timer .icon-button{width:28px;height:28px;color:var(--muted)}.timer svg{width:18px;height:18px}.board-wrap{position:relative}.sudoku-board{display:grid;grid-template-columns:repeat(9,1fr);aspect-ratio:1;border:2px solid var(--grid);border-radius:4px;overflow:hidden;background:white;user-select:none;contain:layout}.cell{min-width:0;padding:0;aspect-ratio:1;border-right:1px solid #ced8e5;border-bottom:1px solid #ced8e5;position:relative;display:grid;place-items:center;font-size:clamp(23px,6.8vw,34px);font-weight:450;line-height:1;color:var(--blue-dark);border-radius:0}.cell.given{font-weight:500;color:var(--ink)}.cell:nth-child(3n){border-right:2px solid var(--grid)}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--grid)}.cell:nth-child(n+73){border-bottom:0}.cell.related{background:#f0f4f9}.cell.match{background:#dce9fb;color:#1459bc}.cell.selected{background:#bdd7fa;box-shadow:inset 0 0 0 2px #82b0ed;z-index:1}.cell.error{color:#d44550;background:#fff0f0}.cell.error.selected{background:#ffdce1;box-shadow:inset 0 0 0 2px #e98b94}.notes{position:absolute;inset:3px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);color:#71829a;font-size:clamp(10px,2.8vw,13px);font-weight:500;line-height:1.2}.notes span{display:grid;place-items:center;border-radius:2px}.notes span.note-match{color:#1459bc;background:#c3dafe}.tools{display:grid;grid-template-columns:repeat(5,1fr);gap:2px;padding:18px 0 14px}.tool{display:flex;align-items:center;flex-direction:column;justify-content:center;gap:7px;min-height:62px;padding:3px 0;color:#657891;font-size:12px;white-space:nowrap;border-radius:10px}.tool svg{width:26px;height:26px}.tool:hover{background:var(--bg)}.tool[aria-pressed=true]{background:var(--blue-light);color:var(--blue-dark)}.tool .icon-holder{position:relative;display:flex}.mode-dot{position:absolute;right:-16px;top:-7px;font-size:9px;background:#dae1ea;color:#52647d;padding:1px 4px;border-radius:4px}.tool[aria-pressed=true] .mode-dot{background:var(--blue);color:white}.number-pad{display:grid;grid-template-columns:repeat(9,1fr);gap:4px}.number-key{border-radius:9px;color:var(--blue-dark);background:#eff5ff;padding:7px 0 5px;min-height:64px;font-size:30px;line-height:1.15;font-weight:450}.number-key small{display:block;font-size:11px;line-height:1.5;color:#8a9db9;margin-top:3px}.number-key.finished{color:#9badc5;background:#f5f7fa}.number-key:hover{background:#dceaff}.action-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:22px}.save-state{font-size:12px;color:var(--muted);display:flex;gap:4px;align-items:center}.save-state svg{width:15px;height:15px;color:#7b94b1}.text-button{color:var(--blue-dark);font-weight:650;font-size:14px;padding:10px 14px;border-radius:9px;background:var(--blue-light)}.game-nav{display:flex;border-top:1px solid #edf0f5;margin-top:25px;padding-top:17px;justify-content:center;gap:30px;font-size:13px;color:#7b879a}.game-nav a{display:flex;align-items:center;gap:7px;padding:5px}.game-nav svg{width:18px;height:18px}.game-nav a[aria-current=page]{color:var(--blue-dark);font-weight:650}.board-overlay{position:absolute;inset:0;background:#f4f8fff5;backdrop-filter:blur(8px);z-index:5;border:2px solid var(--grid);border-radius:4px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:13px;padding:20px}.board-overlay>svg{width:40px;height:40px;color:var(--blue)}.board-overlay h2{font-size:24px;letter-spacing:-.7px}.board-overlay p{font-size:14px;color:var(--muted)}.primary-button{background:var(--blue);color:white;border-radius:12px;padding:13px 22px;min-height:46px;font-weight:650;font-size:15px}.primary-button:hover{background:var(--blue-dark)}.secondary-button{background:var(--bg);border-radius:12px;padding:13px 22px;min-height:46px;font-size:15px}.wide{width:100%}dialog{width:min(calc(100% - 32px),400px);padding:26px;border:0;border-radius:22px;box-shadow:0 20px 80px #0d264940;color:var(--ink);background:white}dialog::backdrop{background:#15273d66;backdrop-filter:blur(3px)}.dialog-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.dialog-header h2{font-size:22px;letter-spacing:-.7px}.dialog-header .icon-button{margin-right:-10px}.dialog-desc{font-size:14px;color:var(--muted);margin-bottom:20px;line-height:1.7}.level-choice{border:1px solid var(--line);border-radius:13px;padding:16px;margin-top:10px;width:100%;display:flex;align-items:center;justify-content:space-between;font-weight:650;text-align:left}.level-choice:hover{background:var(--blue-light);border-color:#a8c7f5}.level-choice small{display:block;color:var(--muted);font-weight:400;font-size:13px;margin-top:3px}.dialog-actions{display:flex;gap:8px;margin-top:20px}.dialog-actions>*{flex:1}.help-list{padding-left:20px;font-size:14px;line-height:1.9;color:#596b83}.help-list li{margin:8px 0}.license-links{font-size:14px;display:grid;gap:10px}.license-links a{color:var(--blue-dark);text-decoration:underline}.toast{position:fixed;bottom:max(30px,env(safe-area-inset-bottom));left:50%;transform:translate(-50%,10px);padding:13px 19px;background:#283b54;color:white;border-radius:12px;font-size:14px;box-shadow:0 5px 20px #0002;max-width:calc(100% - 32px);width:max-content;z-index:50;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s}.toast.show{opacity:1;transform:translate(-50%,0)}.completion-stats{font-variant-numeric:tabular-nums;color:var(--blue-dark);font-weight:600}
@media(min-width:850px){.home-shell{width:760px;padding:0 32px 26px;min-height:0;margin-top:70px}.home-shell .home-cards{grid-template-columns:1fr 1fr}.home-shell .home{padding-top:32px}.home-shell .home h2{margin-bottom:28px}.home-shell .card-art{height:230px}.home-shell .home-note{margin-top:30px}}
@media(max-width:540px){body{background:white}.shell{width:100%;border:0;border-radius:0;box-shadow:none;margin:0;min-height:100dvh;padding:0 16px max(18px,env(safe-area-inset-bottom))}.app-header{height:70px;padding-top:env(safe-area-inset-top)}.home-shell{padding:0 22px 22px}.home{padding-top:16px}.card-art{height:155px}.home h2{font-size:26px}.app-header h1{font-size:21px}.tools{padding:16px 0 12px}.action-row{margin-top:16px}.game-nav{margin-top:18px;padding-top:12px}.number-key{font-size:28px;min-height:61px}.sudoku-board{border-radius:2px}.footer{margin-top:20px}}
@media(max-width:360px){.shell{padding-left:10px;padding-right:10px}.tools{gap:0}.tool{font-size:11px}.number-pad{gap:3px}.number-key{font-size:25px;min-height:55px}.app-header{height:62px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
/* Keep all nine candidates inside a cell on narrow phones. */
.notes{inset:2px;grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:repeat(3,minmax(0,1fr));font-size:clamp(8px,2.4vw,12px);line-height:1}
.notes span{min-width:0;min-height:0}
.tool{font-size:14px}
@media(max-width:360px){.tool{font-size:12px}}