:root{--color-bg: #1a1a2e;--color-board-bg: #f0d9a8;--color-board-line: #8b6914;--color-cell-clickable: rgba(100, 200, 100, .35);--color-primary: #ff6b9d;--color-primary-dark: #e55a8c;--color-secondary: #6b9dff;--color-text: #ffffff;--color-text-muted: rgba(255,255,255,.7);--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px);--admob-banner-height: 0px;--ui-gap: 6px;--ui-pad-x: 8px;--ui-pad-y: 4px;--ui-radius-md: 12px;--title-logo-size: clamp(260px, 74vmin, 560px);--ui-score-panel-h: 58px;--ui-turn-count-h: 20px;--ui-top-reserve: calc(var(--ui-score-panel-h) + var(--ui-gap) * 2);--ui-bottom-reserve: calc(var(--ui-turn-count-h) + var(--ui-gap) * 2);--board-available-h: calc( 100dvh - var(--safe-top) - var(--safe-bottom) - var(--ui-top-reserve) - var(--ui-bottom-reserve) );--board-available-w: calc( 100dvw - var(--safe-left) - var(--safe-right) - var(--ui-pad-x) * 2 );--board-size-min: 252px;--board-size-max: 900px;--board-size: clamp( var(--board-size-min), min(var(--board-available-h), var(--board-available-w)), var(--board-size-max) );--board-border: 2px;--board-gap: 1px;--board-cell-size: calc( (var(--board-size) - var(--board-border) * 2 - var(--board-gap) * 8) / 9 );--side-panel-w: clamp(220px, 28dvw, 320px);--font-main: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{height:100%}body{font-family:var(--font-main);background-color:var(--color-bg);color:var(--color-text);height:100dvh;overflow:hidden;padding:var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left)}#root{width:100%;height:100%}button{cursor:pointer;font-family:inherit;border:none;background:none}img{display:block;max-width:100%}.app-container{width:100%;height:100%;display:flex;align-items:center;justify-content:center}.screen{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;overflow-y:auto}.screen--result,.screen--ranking{scrollbar-gutter:stable}.screen--title{position:relative;background-size:cover;background-position:center;justify-content:center}.title-overlay{position:relative;display:flex;flex-direction:column;align-items:center;gap:calc(var(--ui-gap) * 2);padding:calc(var(--ui-pad-y) * 4) calc(var(--ui-pad-x) * 2);padding-bottom:calc(var(--admob-banner-height) + var(--ui-pad-y) * 4);background:#0000008c;border-radius:var(--ui-radius-md);width:min(100%,420px);max-width:100%;height:min(100%,100dvh);max-height:100%;overflow:hidden}.title-top-icons{position:absolute;top:calc(var(--ui-pad-y) * 2);right:calc(var(--ui-pad-x) * 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rgba(0,0,0,.6)}.difficulty-card__label-ja{font-size:18px;font-weight:900}.difficulty-card__label-en{font-size:13px;font-weight:700;opacity:.8;letter-spacing:.08em}.difficulty-card__bubble{position:absolute;left:50%;bottom:calc(100% + 10px);transform:translate(-50%);padding:6px 14px;background:#fff;color:#1a1a2e;border-radius:14px;font-size:13px;font-weight:700;letter-spacing:.02em;max-width:min(calc(100% - 16px),280px);white-space:normal;text-align:center;line-height:1.35;box-shadow:0 4px 12px #00000059;opacity:0;visibility:hidden;transition:opacity .2s,transform .2s;pointer-events:none}.difficulty-card__bubble:after{content:"";position:absolute;left:50%;top:100%;transform:translate(-50%);border-style:solid;border-width:6px 6px 0 6px;border-color:#ffffff transparent transparent transparent}.difficulty-card--active .difficulty-card__bubble{opacity:1;visibility:visible}.difficulty-note{font-size:11px;color:#ffe066bf;text-align:center;padding:4px 8px;line-height:1.4}.difficulty-buttons{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%}.intro-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#0000008c;z-index:20;animation:introFade .3s ease-out;pointer-events:none}@keyframes introFade{0%{opacity:0}to{opacity:1}}.intro-overlay__card{background:#000000d9;border:2px solid #ffe066;border-radius:20px;padding:26px 36px;display:flex;flex-direction:column;align-items:center;gap:10px;box-shadow:0 0 28px #ffe0664d;animation:introPop .4s cubic-bezier(.25,1.4,.5,1)}@keyframes introPop{0%{transform:scale(.3);opacity:0}60%{transform:scale(1.1);opacity:1}to{transform:scale(1)}}.intro-overlay__piece{width:72px;height:72px;border-radius:50%;border:3px solid white;object-fit:contain;animation:introSpin 1.1s ease-in-out}@keyframes introSpin{0%{transform:rotate(-24deg) scale(.9)}50%{transform:rotate(20deg) scale(1.05)}to{transform:rotate(0) scale(1)}}.intro-overlay__title{font-size:22px;font-weight:900;color:#ffe066;text-align:center;text-shadow:2px 2px 4px rgba(0,0,0,.8);letter-spacing:.05em}.intro-overlay__sub{font-size:13px;color:#ffffffd9;text-align:center}.score-card__komi{font-size:9px;color:#ffe066;background:#ffe06633;padding:1px 4px;border-radius:4px;font-weight:700;margin-left:auto}.score-card__komi+.score-card__turn{margin-left:4px}.score-table__komi{font-size:9px;color:#ffe066;background:#ffe06633;padding:1px 5px;border-radius:4px;font-weight:700;margin-right:4px}@media not all and (min-aspect-ratio:3/4){.screen--game{justify-content:center}}@media(min-aspect-ratio:3/4)and (max-aspect-ratio:4/3){.screen--game{justify-content:center;gap:var(--ui-gap)}}@media(min-aspect-ratio:4/3){:root{--ui-top-reserve: 0px;--ui-bottom-reserve: 0px;--board-available-w: calc( 100dvw - var(--safe-left) - var(--safe-right) - var(--ui-pad-x) * 2 - var(--side-panel-w) - var(--ui-gap) * 2 )}.screen--game{display:grid;grid-template-columns:var(--board-size) var(--side-panel-w);grid-template-rows:auto 1fr auto;grid-template-areas:"board  score" "board  undo" "board  count";align-items:stretch;justify-content:center;align-content:center;column-gap:calc(var(--ui-gap) * 2);row-gap:var(--ui-gap)}.board{grid-area:board;align-self:center}.score-panel{grid-area:score;flex-direction:column;padding:calc(var(--ui-gap) * 2);gap:var(--ui-gap);justify-content:center;border-radius:var(--ui-radius-md);width:100%}.score-panel__vs{justify-content:center;padding:2px 0}.score-card{width:100%}.score-card__total{font-size:22px}.turn-count{grid-area:count;width:100%}.undo-slot{grid-area:undo;width:100%}}.undo-slot{display:flex;justify-content:center;align-items:center;flex-shrink:0}.undo-button{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.03em;border:1px solid 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var(--ui-pad-y));overflow:hidden}.ranking-overlay{display:flex;flex-direction:column;align-items:stretch;gap:12px;padding:18px 16px;background:#000000b8;border-radius:20px;margin:0 auto;max-width:520px;width:100%;height:100%;min-height:0;overflow:hidden}.ranking-title{font-size:clamp(16px,4.5vw,22px);font-weight:900;color:#ffe066;text-align:center;text-shadow:2px 2px 4px rgba(0,0,0,.8)}.ranking-tabs{display:flex;gap:6px;background:#00000059;padding:4px;border-radius:10px}.ranking-tab{flex:1;padding:8px 10px;border-radius:8px;font-size:13px;font-weight:700;color:#ffffffb8;background:transparent;transition:background-color .15s,color .15s}.ranking-tab--active{background:#ffe06638;color:#ffe066}.ranking-panel-wrapper{width:100%;min-height:0;flex:1;display:flex;align-items:stretch}.ranking-panel-wrapper .timeline-panel{display:flex;flex-direction:column;margin-top:0}.ranking-panel-wrapper .timeline-panel__list{flex:1;max-height:none}.ranking-buttons{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%;padding-top:4px}.timeline-panel__my-entry{margin-top:10px;padding:8px 12px;background:#ffe06624;border:1px solid rgba(255,224,102,.4);border-radius:10px;display:flex;align-items:center;gap:10px;font-size:12px}.timeline-panel__my-entry-label{font-weight:700;color:#ffe066}.timeline-panel__my-entry-rank{flex:1;color:#fff;font-weight:700}.timeline-panel__my-entry-score{color:#fff;font-weight:800}.title-ranking-btn{width:100%;max-width:320px}.offline-banner{position:fixed;top:0;left:0;right:0;z-index:1000;display:flex;align-items:center;gap:12px;padding:8px 16px;background:#b45050eb;color:#fff;font-size:13px;box-shadow:0 2px 6px #0000004d;padding-top:max(8px,env(safe-area-inset-top))}.offline-banner__message{flex:1;min-width:0}.offline-banner__retry{background:#fff3;border:1px solid rgba(255,255,255,.5);color:#fff;padding:4px 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