:root{font-family:Avenir Next,Avenir,system-ui,sans-serif;color:#edf3fa;background:#0d1520;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #edf3fa;--ink-soft: #c6d3e2;--muted: #a3b5ca;--card: #182636;--line: #35485e;--accent: #8ed5ff;--lime: #efcf83;--danger: #ff9299;--light-square: #e9edf2;--dark-square: #7090b0}*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(ellipse at 30% 0,#20385066,transparent 60%),#0d1520}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.42}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}button{touch-action:manipulation}a{color:var(--accent)}.icon{flex-shrink:0;vertical-align:middle}.app-shell{max-width:1500px;margin:auto;padding:20px 28px max(24px,env(safe-area-inset-bottom))}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1160px;margin:0 auto 22px}.brand-cluster,.brand,.topbar-actions{display:flex;align-items:center;gap:12px}.topbar{flex-wrap:wrap}.topbar-actions{margin-left:auto;--feedback-ink:var(--text)}.topbar-actions [data-feedback-mount]{display:inline-flex;flex:none}.brand-mark{width:43px;height:43px;background:var(--accent);color:#14273a;display:grid;place-items:center;border-radius:13px;font-size:26px;font-weight:800;box-shadow:inset 0 -3px #23384f33}.brand-name{font-size:17px;line-height:1.15;letter-spacing:.015em;font-weight:800;margin:0}.brand-name small{display:block;font-size:11px;letter-spacing:.28em;color:var(--muted);margin-top:4px}.hub-back{display:flex;align-items:center;gap:6px;text-decoration:none;font-size:13px;min-height:44px;padding:0 10px;border-radius:9px;color:var(--muted)}.hub-back:hover{background:var(--card);color:var(--ink)}.local-badge{font-size:13px;color:var(--muted);margin-right:4px;display:flex;align-items:center;gap:8px}.local-badge-dot{height:6px;width:6px;border-radius:50%;background:#91d8b9}.icon-button{width:44px;height:44px;border:1px solid var(--line);border-radius:12px;display:inline-grid;place-items:center;background:#192839}.icon-button:hover{background:#263b50;border-color:#7b9ebc}.game-layout{--board-size: min( calc(100svh - 214px) , calc(100vw - 430px) ,760px);display:grid;grid-template-columns:var(--board-size) minmax(300px,340px);gap:24px;justify-content:center;align-items:start}.board-column{min-width:0;display:flex;flex-direction:column;gap:12px}.player-bar{display:flex;align-items:center;gap:11px;min-height:48px;padding:0 2px;border-radius:12px}.player-avatar{display:grid;place-items:center;flex-shrink:0;width:38px;height:38px;border:1px solid #64768b;border-radius:10px;background:#273c51}.player-avatar--w{background:#e1e9ee}.player-identity{min-width:0;flex:1}.player-name-line{display:flex;align-items:center;gap:8px}.player-name-line strong{font-size:14px}.bot-tag{font-size:10px;letter-spacing:.07em;font-weight:700;border:1px solid var(--line);padding:2px 5px;border-radius:5px;color:var(--muted)}.playing-dot,.turn-state-dot{display:inline-block;width:6px;height:6px;background:#8dd9b2;border-radius:50%;flex-shrink:0}.captured-empty{font-size:12px;color:#92a7bf}.captured-list{display:flex;align-items:center;gap:3px;min-height:19px;flex-wrap:wrap}.captured-group{display:inline-flex;align-items:center;gap:1px}.captured-group small{font-size:10px;color:#bed1e2}.material-lead{font-size:12px;font-weight:700;color:var(--lime);margin-left:5px}.player-bar-meta{display:flex;align-items:center;gap:9px}.turn-state{display:inline-flex;align-items:center;gap:6px;font-size:11px;color:var(--muted);font-weight:600;padding:6px 8px;border-radius:7px;background:#1b2c3e}.turn-state--active{background:#163c40;color:#b0e7d2}.turn-state--winner{color:var(--lime)}.casual-tag{font-size:12px;color:var(--muted)}.infinity-symbol{margin-right:5px;font-size:20px}.board-wrap{position:relative;padding:7px;background:#3c536a;border-radius:13px;box-shadow:0 14px 40px #0004,0 2px #7791a155}.chess-board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));position:relative;container-type:inline-size;border-radius:6px;overflow:hidden;isolation:isolate}.board-row{display:contents}.board-square{border:0;padding:0;min-height:0;min-width:0;display:grid;place-items:center;position:relative;aspect-ratio:1;isolation:isolate;background:var(--light-square);user-select:none;-webkit-user-select:none}.square-dark{background:var(--dark-square)}.board-square:before,.board-square:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.board-square.square-move-from:before{background:#d9b45a55}.board-square.square-move-to:before{background:#e6d87388}.board-square.square-selected:after{box-shadow:inset 0 0 0 4px #006686;background:#67d5ff25;z-index:2}.board-square.square-capture:after{top:4px;right:4px;bottom:4px;left:4px;border:5px solid #a8324c99;border-radius:50%}.board-square:focus-visible{outline:0;box-shadow:inset 0 0 0 4px #071f37,inset 0 0 0 7px #aff0ff;z-index:4}.board-square:hover{filter:brightness(1.05)}.legal-dot{width:23%;height:23%;border-radius:50%;background:#164b6899;border:2px solid #eefcff88;position:absolute;z-index:3;box-shadow:0 1px 3px #1b384044}.move-marker{position:absolute;right:4px;bottom:4px;font-size:11px;font-weight:800;background:#163b50;color:#fff;border-radius:5px;min-width:15px;padding:2px;z-index:4;text-align:center}.rank-label,.file-label{position:absolute;color:#28445d;font-size:11px;font-weight:700;z-index:1}.square-dark .rank-label,.square-dark .file-label{color:#102d4a}.rank-label{left:4px;top:3px}.file-label{right:4px;bottom:3px}.chess-piece{display:block;position:relative;z-index:1;font-family:Arial Unicode MS,DejaVu Sans,Segoe UI Symbol,serif;font-size:10.4cqw;font-weight:400;line-height:1;-webkit-user-select:none;user-select:none;pointer-events:none;paint-order:stroke fill;font-variant-emoji:text;text-shadow:0 2px 1px #0003}.piece-w{color:#fffdf4;-webkit-text-stroke:2.4px #253447}.piece-b{color:#132133;-webkit-text-stroke:1px #dfe8f2}.chess-piece--small{font-size:24px;line-height:1}.captured-list .chess-piece{font-size:17px}.chess-piece--small.piece-w{-webkit-text-stroke:1px #203244}.chess-piece--small.piece-b{-webkit-text-stroke:.6px #dce6f5}.player-avatar .chess-piece--small{font-size:28px}.mobile-turn-bar{display:none}.control-panel{display:flex;flex-direction:column;min-width:0;align-self:stretch;max-height:calc(100svh - 105px);overflow:auto;background:#172534;border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 26px #0002}.panel-status{padding:21px 21px 14px}.status-kicker{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.13em}.check-badge{background:#5b293a;color:#ffcbd0;border-radius:5px;padding:3px 6px;font-size:10px;letter-spacing:.05em}.panel-status 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max(18px,env(safe-area-inset-bottom));border:0;background:transparent;color:var(--ink);overflow:auto}.modal-backdrop[open]{display:flex;align-items:center;justify-content:center}.modal-backdrop::backdrop{background:#071321c9;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal-card{position:relative;width:min(100%,490px);max-height:100%;overflow:auto;padding:30px;background:#1c2e40;border:1px solid #607d92;border-radius:22px;box-shadow:0 20px 70px #0005}.modal-close{position:absolute;right:16px;top:16px}.eyebrow{display:block;font-size:11px;letter-spacing:.13em;color:#9fc7dd;margin:5px 50px 15px 0}.modal-card h2{font-size:29px;line-height:1.2;letter-spacing:-.03em;margin:0 42px 13px 0}.modal-intro,.reset-card>p{font-size:14px;line-height:1.65;color:#b7ccdd;margin:0 0 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button:hover{background:#486c82}.piece-arrival-hidden{opacity:0}.piece-flight{position:absolute;z-index:5;display:grid;width:12.5%;height:12.5%;place-items:center;pointer-events:none;animation:piece-flight .36s cubic-bezier(.22,.78,.24,1) both}.piece-flight .chess-piece{filter:drop-shadow(0 6px 5px #0b203750)}@keyframes piece-flight{0%{transform:translate(0)}55%{transform:translate(var(--flight-mid-x),var(--flight-mid-y)) scale(1.06)}to{transform:translate(var(--flight-x),var(--flight-y))}}.capture-burst{position:absolute;width:12.5%;height:12.5%;z-index:6;pointer-events:none}.capture-burst i{position:absolute;left:calc(50% + var(--pixel-x));top:calc(50% + var(--pixel-y));width:6px;height:6px;background:#fcf8e8;animation:capture-pixel .7s ease-out both;animation-delay:var(--pixel-delay)}.capture-burst--b i{background:#182a3c;box-shadow:0 0 0 1px #dce8ed88}@keyframes 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strong{font-size:clamp(21px,4.5vw,34px);color:#f4dc9f;line-height:1.2}.board-announcement--result>span{font-size:14px}.board-announcement--result button{display:flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:9px;background:#95d7f6;color:#19364a;min-height:44px;margin-top:7px;font-weight:700;font-size:14px}@keyframes notice-in{0%{opacity:0;bottom:8px}to{opacity:1;bottom:15px}}@media(min-width:1400px){.game-layout{--board-size: min( calc(100svh - 220px) , calc(100vw - 480px) ,820px);grid-template-columns:var(--board-size) 360px}.panel-status{padding:24px}.panel-status h2{font-size:28px}.move-progress{padding:0 24px 20px}.move-card{padding:15px 10px}.move-card-copy strong{font-size:14px}}@media(max-width:899px)and (orientation:portrait),(max-width:699px){.app-shell{padding:14px 16px 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span{display:grid;place-items:center;border-radius:50%;width:25px;height:25px;background:#30495e;color:#aac0d1;font-size:12px;font-weight:700}.mobile-steps .current{background:#a1defb;color:#183b51;box-shadow:0 0 0 3px #92dcff22}.mobile-steps .done{background:#27584f;color:#a5e6cd}.player-bar{min-height:38px;gap:8px}.player-avatar{width:31px;height:31px;border-radius:8px}.player-avatar .chess-piece--small{font-size:24px}.player-name-line strong{font-size:13px}.captured-empty{font-size:10px}.captured-list{min-height:16px}.captured-list .chess-piece{font-size:15px}.player-bar-meta{gap:5px}.casual-tag{display:none}.turn-state{font-size:10px;padding:5px 6px}.playing-dot{display:none}.control-panel{width:100%;max-height:none;overflow:visible;border:0;box-shadow:none;background:transparent;border-radius:0;gap:12px}.control-panel>.panel-status,.control-panel>.move-progress,.control-panel>.move-one-note,.control-panel>.result-card{display:none}.panel-actions{order:-3;margin:0;padding:0;border:0;gap:7px;background:none;border-radius:0;flex-wrap:nowrap}.panel-actions>.secondary-button:first-child{width:auto;flex:1.15}.panel-actions>.panel-action{flex:1}.panel-actions .secondary-button{font-size:12px;min-height:44px;padding:10px 6px;gap:5px}.panel-actions .icon{width:16px;height:16px}.panel-settings{order:-2;padding:0;border:0}.settings-summary{font-size:13px;min-height:46px}.settings-body{background:#182b3e;border:1px solid #3b536a;border-top:0;padding:14px;border-radius:0 0 10px 10px}.mode-switch button{font-size:12px}.difficulty-picker button{min-height:44px}.history-section{padding:16px;background:#182838;border:1px solid #354e64;border-radius:12px}.history-empty{padding:5px 0}.history-list{max-height:170px}.notice{margin:0;padding:12px;font-size:13px;order:-1}.rule-strip{gap:8px;margin-top:18px}.rule-strip-mark,.rule-strip>div{display:none}.rule-chip{font-size:10px;padding:6px 7px}.rule-strip>button{font-size:12px}.game-guide{margin-top:18px}.game-guide-content{grid-template-columns:1fr;gap:12px}.game-guide h2{font-size:23px}.rank-label,.file-label{font-size:9px}.move-marker{font-size:9px;min-width:12px;padding:1px;right:3px;bottom:3px}.board-square.square-selected:after{box-shadow:inset 0 0 0 3px #006686}.board-square.square-capture:after{top:3px;right:3px;bottom:3px;left:3px;border-width:3px}.piece-w{-webkit-text-stroke:1.8px #253447}.piece-b{-webkit-text-stroke:.8px #dfe8f2}.modal-card{padding:24px 20px;border-radius:18px}.modal-card h2{font-size:25px}.rule-item{padding:12px 10px;gap:8px}.rule-item p{font-size:12px}.promotion-options{gap:6px}.promotion-options .chess-piece{font-size:39px}.promotion-options button{min-height:94px}.board-announcement--turn-stop{bottom:10px;padding:9px 13px}.board-announcement--turn-stop strong{font-size:15px}.board-announcement--turn-stop span{font-size:10px}}@media(min-width:700px)and (orientation:landscape)and (max-height:600px){.app-shell{padding:10px 20px}.topbar{margin-bottom:12px;max-width:900px}.game-layout{--board-size: max(235px, calc(100svh - 171px) );grid-template-columns:var(--board-size) minmax(285px,340px);gap:20px}.board-column{gap:5px}.player-bar{min-height:35px}.player-avatar{width:30px;height:30px}.player-avatar .chess-piece--small{font-size:24px}.player-name-line strong{font-size:12px}.captured-empty{font-size:10px}.casual-tag{display:none}.turn-state{font-size:9px;padding:5px}.control-panel{max-height:calc(100svh - 86px)}.panel-status{padding:14px 16px 10px}.panel-status h2{font-size:21px;margin-top:7px}.panel-status p{font-size:12px}.move-progress{padding:0 16px 12px}.move-card{padding:9px}.panel-settings{padding:0 16px 12px}.history-section,.panel-actions{padding:12px 16px}.rule-strip{margin-top:15px}.modal-card{padding:20px;max-height:calc(100svh - 30px)}.rules-card .modal-intro{display:none}.rule-list{gap:6px;margin-bottom:14px}.rule-item{padding:9px}.rule-item p{font-size:12px;margin-top:4px}.rule-item strong{font-size:13px}}@media(min-width:700px)and (orientation:landscape)and (max-height:600px){.game-layout{--board-size: min( calc(100svh - 88px) , calc(100vw - 365px) );grid-template-columns:var(--board-size) minmax(285px,340px)}.board-column>.player-bar{display:none}.panel-status{order:-5}.move-progress{order:-4}.panel-actions{order:-3;flex-wrap:nowrap;padding:10px 14px;margin:0;border-bottom:1px solid #304255;border-radius:0}.panel-actions>.secondary-button:first-child{width:auto;flex:1.15}.panel-actions .secondary-button{font-size:11px;padding:9px 6px;gap:4px}.panel-actions .icon{width:15px;height:15px}.panel-settings{padding-top:12px}.move-one-note{order:-2}.notice{order:-1}}@media(max-width:360px){.app-shell{padding:10px 10px 20px}.brand-name{font-size:12px}.brand-name small{font-size:8px}.brand-mark{display:none}.topbar{gap:8px;margin-bottom:10px}.topbar-actions{gap:5px}.icon-button{width:42px;height:42px}.mobile-turn-bar{padding:8px 10px;min-height:48px}.mobile-turn-bar strong{font-size:13px}.board-column{gap:5px}.player-bar-meta .turn-state{font-size:9px}.bot-tag{font-size:8px}.panel-actions .secondary-button{font-size:11px}.modal-card{padding:22px 16px}.modal-card h2{font-size:23px}.promotion-options .chess-piece{font-size:34px}.promotion-options button>span:last-child{font-size:10px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}.piece-flight{transform:translate(var(--flight-x),var(--flight-y))}}