@font-face{font-family:Fredoka;src:url(/assets/fredoka_bold.ttf)format("truetype");font-weight:700;font-display:swap}:root{color:#080a0d;font-synthesis:none;--ground:#e8f0fb;--original-shadow:2px 2px 5px #0077a8;--tile-size:80px;background:#e8f0fb;font-family:Arial,Malgun Gothic,sans-serif}*{box-sizing:border-box}body{word-break:keep-all;margin:0}button,a,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,summary:focus-visible{outline-offset:4px;outline:3px solid #582b8f}button{color:inherit}button svg{display:block}button[hidden],[hidden]{display:none!important}.game-shell{max-width:540px;min-height:100dvh;padding:max(14px,env(safe-area-inset-top)) 20px 0;overflow-wrap:anywhere;flex-direction:column;margin:0 auto;display:flex}.game-view{flex-direction:column;flex:1;min-width:0;display:flex}.game-location{align-items:center;min-height:34px;margin:9px 0 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svg{fill:none;stroke:#070809;stroke-width:4px;stroke-linecap:round;stroke-linejoin:round;width:100%;height:100%}.help-icon{padding:0;font-family:Fredoka,sans-serif;font-size:44px;line-height:32px}.challenge-heading{text-align:center;margin-top:6px}.daily-label{letter-spacing:2px;color:#43526b;margin:0;font-family:Fredoka,sans-serif;font-size:13px}.challenge-heading h1{text-shadow:var(--original-shadow);letter-spacing:-1.5px;margin:7px 0;font-family:Fredoka,sans-serif;font-size:clamp(31px,9.4vw,48px);line-height:1.05}.date-line{color:#334456;min-height:19px;margin:6px 0 0;font-size:13px}.day-notice{background:#f5f8fc;border:1px solid #9db3d3;border-radius:8px;margin-top:12px;padding:9px 12px;font-size:13px;line-height:1.5}.day-notice a{color:#234f87;font-weight:700}.scoreboard{grid-template-columns:1fr 1.35fr 1fr;align-items:center;gap:10px;min-height:100px;padding:10px 3px 13px;display:grid}.best-stat{flex-direction:column;align-items:flex-start;display:flex}.stat-title{text-shadow:var(--original-shadow);font-family:Fredoka,sans-serif;font-size:23px}.best-stat strong{text-shadow:var(--original-shadow);margin-left:18px;font-family:Fredoka,sans-serif;font-size:26px;line-height:1.1}.stat-caption{color:#43526b;margin-top:4px;font-size:10px}.move-stat{text-align:center;padding-right:15px}.move-label{color:#43526b;margin-bottom:1px;font-size:12px;display:block}.move-stat strong{text-shadow:var(--original-shadow);font-family:Fredoka,sans-serif;font-size:45px;line-height:1;display:block}.restart-button{background:#a0c4ff;border:2px solid #506070;border-radius:15px;flex-direction:column;justify-self:end;align-items:center;width:64px;min-height:64px;padding:4px 6px 3px;display:flex;position:relative;box-shadow:inset -5px -5px #77a5e64d,3px 4px 4px #0004}.restart-button svg{fill:none;stroke:#080a0d;stroke-width:8px;width:43px;height:43px}.restart-button .arrow-head{fill:#080a0d;stroke:none}.restart-button span{white-space:nowrap;font-size:10px;font-weight:700}.restart-button:active{transform:translateY(1px)}.board-region{width:100%;max-width:500px;margin:0 auto;position:relative}.board{grid-template-columns:repeat(var(--columns,4),minmax(0,1fr));isolation:isolate;touch-action:none;-webkit-user-select:none;user-select:none;background:#464c52;border:2px solid #43494f;gap:3px;padding:1px;display:grid;position:relative}.cell{aspect-ratio:1;touch-action:none;background:linear-gradient(135deg,#6c7279,#202632);border:0;border-radius:6px;justify-content:center;align-items:center;width:100%;min-width:0;padding:3px;display:flex;position:relative}.tile{background:linear-gradient(135deg,#bbb 0,var(--tile-color) 50%,#bbb 100%);color:#f0f8ff;width:100%;height:100%;font-family:Fredoka,sans-serif;font-size:calc(var(--tile-size)*.32);text-shadow:2px 3px 3px #0006;pointer-events:none;border:2px solid #dba9fb;border-radius:17%;flex-direction:column;justify-content:center;align-items:center;line-height:1;display:flex;position:relative;box-shadow:inset 0 -5px 3px #0004}.tile .numerator,.tile .denominator{line-height:1.05;display:block}.fraction-line{background:#f0f8ff;width:53%;height:3px;margin:3px 0;display:block;box-shadow:2px 3px 3px #0006}.tile.integer{font-size:calc(var(--tile-size)*.45)}.cell.empty{background:linear-gradient(135deg,#8a9197,#464d55)}.cell.empty:after{content:"";border:1px solid #31394566;border-radius:10%;position:absolute;inset:5px}.cell:focus-visible{outline-offset:-2px;z-index:3;outline:3px solid #fff29a}.cell.just-changed .tile{animation:.2s ease-out tile-merge}.selection-path{pointer-events:none;filter:drop-shadow(0 1px 2px #0008);width:100%;height:100%;position:absolute;inset:0;overflow:visible}.board-cover{background:#e8f0fb22;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.start-card{text-align:center;background:#edf4fff2;border:2px solid #69819e;border-radius:15px;max-width:90%;padding:19px 21px;box-shadow:3px 5px 8px #0004}.start-card p{margin:0 0 12px;font-size:14px;line-height:1.6}.gradient-button{color:#111;text-align:center;background:linear-gradient(135deg,#d5e7ff,#94b9f5 52%,#d9e9fe);border:2px solid #586b81;border-radius:12px;justify-content:center;align-items:center;min-height:46px;padding:11px 16px;font-weight:700;line-height:1.4;text-decoration:none;display:inline-flex;box-shadow:inset 0 -3px 1px #40608622,2px 3px 3px #0003}.gradient-button.primary{background:linear-gradient(135deg,#e9dcff,#c699ea 52%,#e9ddff);border-color:#71568c}.gradient-button:active{transform:translateY(1px)}.board-instruction{text-align:center;color:#334456;margin:14px 0 0;font-size:13px;line-height:1.45}.selection-actions{justify-content:center;gap:16px;margin-top:4px;display:flex}.text-button{color:#244b80;background:0 0;border:0;min-height:40px;padding:6px;font-size:13px;text-decoration:underline}.play-message{text-align:center;color:#34465b;min-height:20px;margin:7px 0 10px;font-size:13px;line-height:1.45}.game-footer{min-height:88px;padding:12px 0 max(12px,env(safe-area-inset-bottom));border-top:1px solid #c8d7e9;justify-content:space-between;align-items:center;gap:15px;margin-top:auto;display:flex}.footer-button{background:0 0;border:0;align-items:center;gap:8px;min-height:44px;padding:6px 0;font-size:13px;font-weight:700;display:flex}.footer-button svg{stroke:#757f8d;stroke-width:2.6px;fill:none;stroke-linecap:round;stroke-linejoin:round;width:28px;height:28px}.countdown{color:#47596e;text-align:right;font-size:11px;line-height:1.6}.game-dialog{color:#151719;background:#f6f9fe;border:2px solid #75859b;border-radius:20px;width:min(440px,100vw - 28px);max-height:calc(100dvh - 36px);padding:27px 22px 22px;overflow:auto;box-shadow:5px 8px 22px #0006}.game-dialog::backdrop{background:#25344a88}.game-dialog h2{text-align:center;text-shadow:2px 2px 4px #0083b866;margin:7px 28px 20px;font-family:Fredoka,sans-serif;font-size:30px}.dialog-close{color:#3e4e62;background:0 0;border:0;width:40px;height:40px;font-size:31px;line-height:1;position:absolute;top:6px;right:8px}.help-list{padding-left:22px;font-size:14px;line-height:1.8}.help-list li{margin-bottom:12px}.help-note,details{color:#40516a;font-size:12px;line-height:1.7}.game-dialog>.gradient-button{width:100%;margin-top:13px}.result-dialog{text-align:center;background:linear-gradient(#f5f8fc,#e4edf9)}.finish-spark{color:#ffda2b;text-shadow:0 0 8px #bd851c,2px 3px 3px #0005;margin-top:-12px;font-size:55px}.result-dialog h2{color:#46505d;text-shadow:0 0 10px #f8cf53;margin:0 0 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8px;font-size:13px;display:grid}.rank-row.is-me{background:#e6d7f7}.rank-number{font-family:Fredoka,sans-serif;font-size:21px}.rank-name{overflow-wrap:anywhere}.rank-moves{text-align:right;font-weight:700}.my-ranking{background:#e6d7f7;border-radius:8px;padding:10px}summary{cursor:pointer;padding:6px 0}.board:empty{aspect-ratio:1}.board:empty:after{content:"";min-height:100%;display:block}@keyframes tile-merge{0%{filter:brightness(1.4);transform:scale(.88)}to{filter:brightness();transform:scale(1)}}@media (width>=700px){body{background:linear-gradient(110deg,#d3e0f3,#e8f0fb 40%,#d3e0f3)}.game-shell{background:#e8f0fb;padding-left:28px;padding-right:28px;box-shadow:0 0 40px #58718a22}.challenge-heading{margin-top:12px}.scoreboard{min-height:115px}}@media (width<=360px){.game-shell{padding-left:13px;padding-right:13px}.topbar{min-height:44px}.brand{font-size:20px}.icon-actions{gap:2px}.icon-button{width:40px;height:40px}.challenge-heading h1{font-size:31px}.scoreboard{min-height:91px}.stat-title{font-size:21px}.move-stat strong{font-size:39px}.restart-button{width:58px;min-height:58px}.restart-button svg{width:37px;height:37px}.game-footer{min-height:76px}.game-dialog{padding-left:18px;padding-right:18px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;animation:none!important}}.scoreboard{align-items:end;min-height:0;padding:10px 3px 6px}.move-stat{padding:0 0 7px}.visually-hidden{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.play-message:empty,#ranking-status:empty{display:none}.game-footer{margin-top:auto}.board-region{margin-bottom:12px}.board-cover{z-index:5}.blocked-dialog{text-align:center}.blocked-dialog 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svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:18px;height:18px}.gravity-indicator[data-gravity=on]{background:var(--accent-soft);color:var(--accent-ink)}.gravity-indicator[data-gravity=on] .gravity-hold,.gravity-indicator[data-gravity=off] .gravity-drop{display:none}.scoreboard{grid-template-columns:1fr 1fr 1fr;align-items:center;gap:10px;padding:12px 3px 8px}.best-stat{align-items:center;gap:4px}.stat-title,.move-label{font-family:var(--ui-font);font-size:var(--ui-label);color:var(--ui-muted);text-shadow:none;margin:0;font-weight:600;line-height:1.4}.best-stat strong,.move-stat strong{text-shadow:none;font-variant-numeric:tabular-nums;color:var(--ui-ink);margin:0;font-family:Fredoka,sans-serif;font-weight:700;line-height:1.08}.best-stat strong{font-size:32px}.move-stat{flex-direction:column;align-items:center;gap:4px;padding:0;display:flex}.move-stat 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0 8px;font-size:38px}.blocked-dialog h2{font-size:28px}.result-stats span{font-size:var(--ui-label);color:var(--ui-muted);font-weight:600}.result-stats strong{text-shadow:none;font-size:32px}.rank-row,.my-ranking{font-size:var(--ui-control)}.help-dialog{width:min(440px,100vw - 28px);padding-top:25px}.help-dialog[open]{flex-direction:column;height:min(590px,100dvh - 36px);display:flex}.help-dialog>*{flex-shrink:0}#help-tutorial{flex-direction:column;flex:1;min-height:0;display:flex}.help-dialog .lesson-navigation{margin-top:auto;padding-top:14px}.help-goals{flex:none;margin-top:8px;display:block}.game-dialog .lesson-goal-copy{font-size:var(--ui-control);color:var(--ui-ink);text-align:center;margin:2px 0 0;line-height:1.5}.lesson-outcome{border:1px solid var(--line);background:var(--surface-soft);border-radius:12px;padding:9px 11px}.lesson-score-row{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;min-height:32px;display:grid}[data-goal=daily] 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