.board{aspect-ratio:1;background:#e7e8db;border:6px solid #384b42;border-radius:6px;grid-template-columns:repeat(8,1fr);display:grid;overflow:hidden;box-shadow:0 10px 25px #283a3012}.square{aspect-ratio:1;touch-action:manipulation;border:0;border-radius:0;place-items:center;min-height:0;padding:0;display:grid;position:relative;background:#e7e8db!important}.square.dark{background:#719080!important}.square svg{pointer-events:none;filter:drop-shadow(0 2px 1px #17211c33);z-index:1;width:83%;height:83%;position:relative}.square.last{background:#d6d78e!important}.square.dark.last{background:#9eae64!important}.square.selected{box-shadow:inset 0 0 0 3px #7052b9;background:#b6a2de!important}.square.legal:after{content:"";z-index:2;background:#213b3455;border-radius:50%;width:22%;height:22%;position:absolute}.square.legal.occupied:after{background:0 0;border:5px solid #213b3466;width:88%;height:88%}.square.check{background:#c97970!important}.square:focus-visible{z-index:3;outline:none;box-shadow:inset 0 0 0 3px #5942c4}.coordinate{color:#375348;pointer-events:none;font-size:10px;font-weight:700;line-height:1;position:absolute}.dark .coordinate{color:#f0f1e6}.coordinate.rank{top:4px;left:4px}.coordinate.file{bottom:3px;right:4px}@media (width<=420px){.board{border-width:4px}.coordinate{font-size:8px}.coordinate.rank{top:3px;left:3px}.coordinate.file{bottom:2px;right:3px}}:root{color:#252b2a;font-synthesis:none;--muted:#686e69;--accent:#5d4ad1;--line:#deded2;background:#f5f2ea;font-family:Arial,Helvetica,sans-serif;font-size:15px}*{box-sizing:border-box}body{margin:0}button,a,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;color:inherit;border:1px solid var(--line);background:#fffdf7;border-radius:8px;min-height:44px;padding:10px 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h2{font-size:14px}.spark{color:var(--accent);font-size:26px;line-height:1}.panel .fine{margin:18px 0 0;font-size:11px;line-height:1.6}.mind{background:#f0edf8;border-color:#e0daef}.mind p{margin-bottom:12px}#probabilities{gap:10px;margin:0;padding:0;list-style:none;display:grid}.probability-row{grid-template-columns:44px 1fr 45px;align-items:center;gap:12px;font-size:12px;display:grid}.probability-row strong{font-family:monospace;font-size:14px}.probability-row span:last-child{text-align:right;font-variant-numeric:tabular-nums}.meter{background:#ddd7ef;border-radius:5px;height:6px;overflow:hidden}.meter i{background:#8067d9;border-radius:5px;height:100%;display:block}.probability-row:first-child .meter i{background:#5d4ad1}#ply-count{color:var(--muted);font-size:11px}#history{max-height:182px;margin:16px 0 0;padding:0;font-family:monospace;font-size:13px;list-style:none;overflow:auto}#history:empty{display:none}#history li{border-radius:4px;grid-template-columns:30px 1fr 1fr;padding:8px;display:grid}#history li:nth-child(odd){background:#f1f0e8}#history li span:first-child{color:var(--muted)}#empty-history{margin-bottom:0}.how{color:var(--muted);padding:0 4px;font-size:12px;line-height:1.7}.how summary{cursor:pointer}.how p{margin:12px 0}dialog{border:1px solid var(--line);color:#252b2a;background:#fffdf7;border-radius:16px;width:calc(100% - 32px);max-width:420px;padding:28px}dialog::backdrop{background:#252b2a88}dialog h2{font-family:Georgia,serif;font-size:28px;font-weight:400}dialog p{color:var(--muted);line-height:1.6}.promotion-options{grid-template-columns:1fr 1fr;gap:10px;margin:20px 0;display:grid}.dialog-actions{justify-content:flex-end;gap:12px;margin-top:24px;display:flex}@media (width>=1400px){main{max-width:1160px}.intro{padding:38px 0}.game-layout{gap:48px}}@media (width<=760px){.topbar{padding:18px 20px}main{max-width:620px;padding:0 18px}.intro{padding:24px 0}.intro h1{font-size:65px}.intro p{font-size:13px}.game-layout{grid-template-columns:1fr;gap:20px}.panel{padding:20px}.board-help{margin-bottom:0}.setup{grid-row:auto}.turn-badge{font-size:8px}.board-tools{gap:6px}.board-tools button{padding:8px 5px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}@media (width<=760px){aside{display:contents}.setup{grid-row:1}.table{grid-row:2}}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.intro{padding-bottom:8px}.record-challenge{margin:0 0 28px;font-size:17px;line-height:1.6}.game-notice{margin:10px 0;font-size:13px;line-height:1.6}.game-notice:empty{display:none}.leaderboard-panel .panel-heading>span{color:var(--muted);white-space:nowrap;font-size:12px}#leaderboard{margin:18px 0 0;padding:0;list-style:none}#leaderboard li{border-bottom:1px solid var(--line);grid-template-columns:24px minmax(0,1fr) auto;align-items:center;gap:10px;padding:12px 0;display:grid}#leaderboard .rank{color:var(--muted);font-size:12px}#leaderboard .name{overflow-wrap:anywhere;font-weight:700}#leaderboard .moves{font-variant-numeric:tabular-nums;color:var(--accent);font-size:13px}#result-form{gap:10px;display:grid}#result-form>label{font-size:13px;font-weight:700}#result-form label span{color:var(--muted);font-weight:400}#result-form input:not([type=checkbox]){border:1px solid var(--line);width:100%;font:inherit;background:#fff;border-radius:8px;padding:12px}#result-form input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}#result-form .opt-in{align-items:flex-start;gap:10px;margin:8px 0;font-weight:400;line-height:1.6;display:flex}#result-form [type=checkbox]{width:18px;height:18px;accent-color:var(--accent);flex-shrink:0}#result-form .fine{margin:0;font-size:12px}#identity-error{color:#9a322a;margin:0;font-size:13px}#identity-error:empty{display:none}#result-dialog{max-height:calc(100dvh - 32px);overflow:auto}#edit-result{margin:0 0 14px}@media (width<=760px){.table{grid-row:auto}.record-challenge{margin-bottom:20px;font-size:15px}}