body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.App{background:#fff;color:#333;font-family:Arial,sans-serif;min-height:100vh;text-align:center}.App-header{background-color:#f8f9fa;border-bottom:1px solid #dee2e6;box-shadow:0 1px 3px #0000001a;padding:5px 10px}.App-header h1{color:#2c3e50;font-size:1.4rem;margin:0;text-shadow:none}.game-modes{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;margin-top:30px}.mode-button{background:#007bff;border:2px solid #007bff;border-radius:10px;box-shadow:0 2px 4px #0000001a;color:#fff;cursor:pointer;font-size:1.2rem;padding:15px 30px;transition:all .3s ease}.mode-button:hover:not(.disabled){background:#0056b3;border-color:#0056b3;box-shadow:0 4px 8px #0003;transform:translateY(-2px)}.mode-button.disabled{background:#6c757d;border-color:#6c757d;cursor:not-allowed;opacity:.6}.mode-button.tutorial-button{background:#28a745;border-color:#28a745;font-weight:600}.mode-button.tutorial-button:hover:not(.disabled){background:#218838;border-color:#1e7e34}.back-button{border:2px solid #6c757d;border-radius:5px;box-shadow:0 2px 4px #0000001a;padding:10px 20px;transition:all .3s ease}.back-button:hover{border-color:#5a6268;box-shadow:0 4px 8px #0003;transform:translateY(-1px)}.game-container{gap:30px;max-width:1400px;padding:20px}@media (max-width:1200px){.game-container{align-items:center;flex-direction:column}}@media (max-width:768px){.App-header h1{font-size:1.2rem}.game-modes{gap:15px;margin-top:20px;padding:0 10px}.mode-button{font-size:1rem;max-width:300px;padding:12px 24px;width:100%}.back-button{font-size:.9rem;padding:8px 16px}}@media (max-width:480px){.App-header{padding:8px}.App-header h1{font-size:1.1rem}.game-modes{gap:12px;margin-top:15px}.mode-button{font-size:.95rem;padding:10px 20px}}body{overflow-x:hidden}*{box-sizing:border-box}:root{--square-size:min(8vh,8vw,80px);--board-gap:0px;--board-border:4px}.game-container{box-sizing:border-box;height:100vh;margin:0 auto;max-width:100vw;padding:10px}.game-board-layout,.game-container{align-items:flex-start;display:flex;gap:20px;justify-content:center}.game-board-layout{max-width:1400px;width:100%}.left-panel{align-items:stretch;display:flex;flex-direction:column;gap:0}.test-move-section{background:#f8f9fa;border-bottom:1px solid #dee2e6;border-left:1px solid #dee2e6;border-right:1px solid #dee2e6;box-sizing:border-box;padding:10px;width:250px}.test-move-button{transition:all .2s ease}.test-move-button:hover{background-color:#c00!important;box-shadow:0 3px 6px #0003;transform:translateY(-1px)}.board-container{align-items:center;border:1px solid #dee2e6;border-radius:15px;box-shadow:0 4px 12px #0000001a;flex-direction:column;flex-shrink:0;padding:20px;position:relative;width:-webkit-fit-content;width:fit-content}.board-container,.time-clock{background:#f8f9fa;display:flex}.time-clock{border:2px solid #dee2e6;border-radius:10px;box-shadow:0 2px 8px #0000001a;gap:20px;justify-content:center;margin-bottom:20px;padding:15px}.player-time{align-items:center;background:#fff;border:2px solid #dee2e6;border-radius:8px;display:flex;flex-direction:column;min-width:160px;padding:10px 20px;transition:all .3s ease}.player-time.active{background:#e3f2fd;border-color:#007bff;box-shadow:0 0 0 3px #007bff1a}.player-name{color:#495057;font-size:.9rem;margin-bottom:10px;text-align:center}.time-displays{display:flex;flex-direction:column;gap:8px;width:100%}.time-row{align-items:center;display:flex;gap:8px;justify-content:space-between}.time-label{color:#6c757d;font-size:.8rem;font-weight:700;min-width:45px}.time-display{color:#2c3e50;flex:1 1;font-family:Courier New,monospace;font-size:1.4rem;font-weight:700;letter-spacing:1px;text-align:right}.time-display.low-time{animation:timeWarning 1s ease-in-out infinite alternate;color:#dc3545}.current-player{align-items:center;background:#007bff;border-radius:10px;box-shadow:0 2px 4px #0000001a;color:#fff;display:flex;font-size:1.5rem;font-weight:700;gap:10px;margin-bottom:20px;padding:10px 20px;text-transform:capitalize}.replay-mode-indicator{animation:pulse 2s infinite;background:#28a745;border-radius:6px;color:#fff;font-size:1rem;font-weight:700;padding:5px 10px}.replay-position{color:#fff;font-size:1.2rem;opacity:.9}.exit-replay-button{background:#dc3545;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:1rem;font-weight:700;margin-left:auto;padding:8px 16px;transition:all .2s ease}.exit-replay-button:hover{background:#c82333;box-shadow:0 3px 6px #0003;transform:translateY(-1px)}.player-color{font-size:1rem;margin-left:5px;opacity:.8}.ai-indicator{animation:pulse 2s infinite;font-size:1.2rem}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.move-info{animation:fadeInOut 3s ease-in-out;background:#0f03;border:2px solid #00ff0080;border-radius:8px;color:#4ecdc4;font-size:1rem;font-weight:700;margin-top:15px;min-height:20px;padding:8px 15px;position:relative;text-align:center}@keyframes fadeInOut{0%{opacity:0;transform:translateY(-10px)}20%,80%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-10px)}}.board{grid-gap:0;grid-gap:var(--board-gap);background:#333;border:4px solid #222;border:var(--board-border) solid #222;border-radius:10px;display:grid;flex-shrink:0;gap:0;gap:var(--board-gap);grid-template-columns:repeat(9,min(8vh,8vw,80px));grid-template-columns:repeat(9,var(--square-size));grid-template-rows:repeat(9,min(8vh,8vw,80px));grid-template-rows:repeat(9,var(--square-size));height:calc(min(8vh, 8vw, 80px)*9 + 8px);height:calc(var(--square-size)*9 + var(--board-gap)*8 + var(--board-border)*2);max-height:90vh;max-width:90vw;width:calc(min(8vh, 8vw, 80px)*9 + 8px);width:calc(var(--square-size)*9 + var(--board-gap)*8 + var(--board-border)*2)}.board,.square{overflow:hidden;position:relative}.square{align-items:center;background:#f0d9b5;border:none;cursor:pointer;display:flex;height:min(8vh,8vw,80px);height:var(--square-size);justify-content:center;transition:all .2s ease;width:min(8vh,8vw,80px);width:var(--square-size)}.square.dark{background:#b58863}.square.selected{background:#f7ec2e!important;box-shadow:inset 0 0 0 3px #ff6b6b}.square.highlighted{background:#7dd3fc!important;box-shadow:inset 0 0 0 2px #0369a1}.square.drag-over{background:#93c5fd!important;box-shadow:inset 0 0 0 3px #1d4ed8}.piece{cursor:grab;font-size:calc(min(8vh, 8vw, 80px)*.7);font-size:calc(var(--square-size)*.7);line-height:1;transition:all .2s ease;-webkit-user-select:none;user-select:none;z-index:1}.piece:hover{filter:brightness(1.1);transform:scale(1.1)}.piece.dragging{cursor:grabbing;opacity:.5;transform:scale(.8)}.piece img{height:calc(min(8vh, 8vw, 80px)*.8);height:calc(var(--square-size)*.8);object-fit:contain;pointer-events:none;width:calc(min(8vh, 8vw, 80px)*.8);width:calc(var(--square-size)*.8)}.promotion-overlay{align-items:center;background:#000c;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1000}.promotion-dialog{background:#fff;border-radius:15px;box-shadow:0 8px 32px #0000004d;max-width:500px;padding:30px;text-align:center;width:90%}.promotion-dialog h3{color:#2c3e50;font-size:1.5rem;margin-bottom:20px}.promotion-options{grid-gap:15px;display:grid;gap:15px;grid-template-columns:repeat(3,1fr);margin-top:20px}.promotion-options button{align-items:center;background:#f8f9fa;border:2px solid #dee2e6;border-radius:10px;cursor:pointer;display:flex;flex-direction:column;font-size:.9rem;padding:15px;text-transform:capitalize;transition:all .2s ease}.promotion-options button:hover{background:#e9ecef;border-color:#007bff;box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}.promotion-options button img{height:50px;margin-bottom:8px;object-fit:contain;width:50px}.promotion-options button span{color:#495057;font-size:.85rem;font-weight:500}@media (max-width:1200px){.game-container{gap:15px;padding:5px}:root{--square-size:min(7vh,7vw,70px)}.game-board-layout{gap:15px}}@media (max-width:900px){.game-container{gap:10px;height:auto;max-height:none;padding:0}.game-board-layout,.game-container{align-items:center;flex-direction:column}.game-board-layout{gap:15px;padding:10px 0;width:100%}.left-panel{display:none}.board-container{margin:0;max-width:100vw;padding:10px;width:100%}:root{--square-size:min(6vh,9vw,60px)}.board{margin:0 auto;max-height:60vh;max-width:95vw}}@media (max-width:600px){:root{--square-size:min(5vh,10vw,50px)}.piece{font-size:calc(min(8vh, 8vw, 80px)*.84);font-size:calc(var(--square-size)*.84)}.piece img{height:calc(min(8vh, 8vw, 80px)*.96);height:calc(var(--square-size)*.96);width:calc(min(8vh, 8vw, 80px)*.96);width:calc(var(--square-size)*.96)}.current-player{font-size:1.2rem;padding:8px 16px}.board-container,.game-board-container,.time-clock{padding:10px}.time-clock{flex-direction:column;gap:10px}.player-time{min-width:100%}}@media (max-width:480px){:root{--square-size:calc(11.11111vw - 4.44444px);--board-gap:0px;--board-border:2px}.piece{font-size:calc(min(8vh, 8vw, 80px)*.84);font-size:calc(var(--square-size)*.84)}.piece img{height:calc(min(8vh, 8vw, 80px)*.96);height:calc(var(--square-size)*.96);width:calc(min(8vh, 8vw, 80px)*.96);width:calc(var(--square-size)*.96)}.game-container{overflow-x:hidden;padding:0}.game-board-layout{gap:10px;padding:5px;width:100%}.board{margin:0 auto;max-width:calc(100vw - 20px)}.current-player{font-size:1rem;margin-bottom:10px;padding:6px 12px}.board-container{border-radius:8px;padding:5px;width:100%}.time-clock{gap:8px;margin-bottom:10px;padding:8px}.player-time{min-width:auto;padding:8px 12px}.time-display{font-size:1.2rem}.player-name{font-size:.8rem}.promotion-dialog{padding:15px;width:95%}.promotion-dialog h3{font-size:1.2rem;margin-bottom:15px}.promotion-options{gap:10px;grid-template-columns:repeat(3,1fr)}.promotion-options button{font-size:.8rem;padding:10px 8px}.promotion-options button img{height:40px;width:40px}}@media (hover:none) and (pointer:coarse){.square{-webkit-tap-highlight-color:rgba(0,0,0,.1);cursor:default}.square:active{transform:scale(.95)}.piece{cursor:default;pointer-events:auto}.piece:active{transform:scale(1.1)}.piece:hover,.square:hover{transform:none}.piece:hover{filter:none}}.board .square.check,.square.check,.square.check.dark,.square.check.light,div.board div.square.check{animation:checkPulse 1s ease-in-out infinite 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0,#bbdefb 50%,#e3f2fd 0,#e3f2fd 75%,#bbdefb 0,#bbdefb)!important;background-size:8px 8px;border:2px solid #2196f3!important;box-shadow:inset 0 0 10px #2196f34d,0 0 15px #2196f333!important;position:relative}.square.frozen-zone:before{content:"❄️";font-size:10px;opacity:.7;pointer-events:none;position:absolute;right:2px;top:2px;z-index:5}.square.frozen-zone:after{animation:iceGlimmer 3s ease-in-out infinite;background:linear-gradient(135deg,#0000 30%,#add8e64d 50%,#0000 70%);bottom:0;content:"";left:0;pointer-events:none;position:absolute;right:0;top:0}@keyframes iceShimmer{0%,to{box-shadow:inset 0 0 10px #2196f34d,0 0 15px #2196f333}50%{box-shadow:inset 0 0 20px #2196f380,0 0 25px #2196f366}}@keyframes iceGlimmer{0%,to{opacity:0}50%{opacity:1}}.piece.ai-piece-flash{animation:aiPieceFlash 1s ease-in-out}@keyframes aiMoveFlash{0%{box-shadow:0 0 20px #4ade80cc;transform:scale(1)}50%{box-shadow:0 0 30px #4ade80;transform:scale(1.05)}to{box-shadow:0 0 20px #4ade80cc;transform:scale(1)}}@keyframes aiPieceFlash{0%{filter:brightness(1);transform:scale(1)}25%{filter:brightness(1.3);transform:scale(1.15)}50%{filter:brightness(1.2);transform:scale(1.1)}75%{filter:brightness(1.1);transform:scale(1.05)}to{filter:brightness(1);transform:scale(1)}}.game-history{background:#f8f9fa;border-right:1px solid #dee2e6;display:flex;flex-direction:column;height:100vh;overflow:hidden;width:250px}.history-header{background:#fff;border-bottom:1px solid #dee2e6;padding:20px}.history-header h3{color:#2c3e50;font-size:1.2rem;margin:0 0 15px;text-align:center}.history-controls{display:flex;flex-direction:column;gap:10px}.export-button{background:#4caf50;border:none;border-radius:4px;color:#fff;cursor:pointer;font-size:14px;margin-left:8px;padding:8px 12px;transition:background-color .2s}.export-button:hover{background:#45a049}.export-button:first-child{margin-left:0}.back-button,.menu-button{align-items:center;background:#6c757d;border:none;border-radius:6px;color:#fff;cursor:pointer;display:flex;font-size:.9rem;gap:5px;justify-content:center;padding:8px 12px;transition:background-color .2s}.back-button:hover,.menu-button:hover{background:#5a6268}.menu-button{background:#007bff}.menu-button:hover{background:#0056b3}.game-header{background:#fff;border-bottom:1px solid #dee2e6;padding:20px}.game-header h1{color:#2c3e50;font-size:1.5rem;margin:0 0 15px;text-align:center}.player-names{align-items:center;background:#f8f9fa;border-radius:8px;display:flex;justify-content:space-between;margin-bottom:20px;padding:10px}.player-name{font-size:1rem;font-weight:700}.player-name.white{color:#495057}.player-name.black{color:#2c3e50}.vs{color:#6c757d;font-style:italic}.header-buttons{display:flex;flex-direction:column;gap:10px}.header-buttons .back-button{background:#6c757d;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:.9rem;padding:8px 12px;transition:background-color .2s}.header-buttons .back-button:hover{background:#5a6268}.history-navigation{background:#fff;border-bottom:1px solid #dee2e6;display:flex;justify-content:space-between;padding:15px 20px}.nav-button{background:#007bff;border-radius:6px;color:#fff;font-size:1rem;min-width:40px;padding:8px 10px;transition:background-color .2s}.nav-button:hover:not(:disabled){background:#0056b3}.nav-button:disabled{background:#6c757d;cursor:not-allowed}.history-container{flex:1 1;overflow-y:auto;padding:20px}.move-row{align-items:center;border-bottom:1px solid #f0f0f0;display:flex;padding:4px 0}.move-number{color:#6c757d;font-size:.9rem;font-weight:700;width:30px}.black-move,.white-move{border-radius:4px;cursor:pointer;flex:1 1;font-family:monospace;font-size:.9rem;margin:0 2px;padding:4px 8px;transition:background-color .2s}.white-move{background:#f8f9fa;color:#2c3e50}.black-move{background:#e9ecef;color:#2c3e50}.black-move:hover,.white-move:hover{background:#007bff;color:#fff}.black-move.current-move,.white-move.current-move{background:#007bff;color:#fff;font-weight:700}.clickable-move{cursor:pointer;position:relative}.clickable-move[data-think-time]:hover:after{background:#2c3e50;border-radius:4px;bottom:100%;color:#fff;content:attr(data-think-time);font-size:11px;left:50%;margin-bottom:4px;padding:4px 8px;pointer-events:none;position:absolute;transform:translateX(-50%);white-space:nowrap;z-index:1000}.clickable-move[data-think-time]:hover:before{border:4px solid #0000;border-top-color:#2c3e50;bottom:100%;content:"";left:50%;margin-bottom:-4px;pointer-events:none;position:absolute;transform:translateX(-50%)}.resign-button{background:#dc3545;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:.95rem;font-weight:600;margin:15px 20px;padding:10px 16px;transition:background-color .2s;width:calc(100% - 40px)}.resign-button:hover{background:#c82333}.resign-button:disabled{background:#6c757d;cursor:not-allowed}@media (max-width:768px){.game-history{height:auto;max-height:300px;width:100%}.history-controls{flex-direction:row;flex-wrap:wrap}.back-button,.export-button,.menu-button{flex:1 1;min-width:100px}}.game-info{background:#f8f9fa;border:1px solid #dee2e6;border-radius:15px;box-shadow:0 4px 12px #0000001a;color:#333;max-height:80vh;overflow-y:auto;padding:20px;width:300px}.game-info h3{font-size:1.3rem;margin:0 0 15px}.game-info h3,.game-info h4{color:#2c3e50;text-shadow:none}.game-info h4{font-size:1.1rem;margin:15px 0 10px}.time-controls-info{background:#fff;border:1px solid #dee2e6;border-radius:10px;box-shadow:0 2px 4px #0000000d;margin-bottom:20px;padding:15px}.time-controls-info h3{border-bottom:2px solid #dee2e6;color:#2c3e50;font-size:1.3rem;margin:0 0 15px;padding-bottom:10px;text-align:center}.player-time-info{background:#f8f9fa;border:1px solid #dee2e6;border-radius:8px;margin-bottom:20px;padding:12px}.player-time-info:last-child{margin-bottom:0}.player-time-info h4{align-items:center;color:#2c3e50;display:flex;font-size:1.1rem;gap:8px;margin:0 0 12px}.white-icon{color:#6c757d}.black-icon{color:#343a40}.time-info-grid{display:flex;flex-direction:column;gap:8px}.time-controls-grid{display:flex;flex-direction:column;gap:12px}.thinking-times-row{grid-gap:8px;display:grid;gap:8px;grid-template-columns:1fr 1fr}.total-times-row{display:flex;flex-direction:column;gap:8px}.time-control-item{background:#fff;border:1px solid #dee2e6;border-radius:8px;box-shadow:0 1px 3px #0000001a;display:flex;flex-direction:column;gap:4px;padding:8px 12px}.time-control-label{align-items:center;color:#495057;display:flex;font-size:.8rem;font-weight:600;gap:6px}.time-control-value{align-items:center;color:#2c3e50;display:flex;font-family:Courier New,monospace;font-size:1.1rem;font-weight:700;justify-content:center}.time-info-row{align-items:center;background:#fff;border:1px solid #dee2e6;border-radius:6px;display:flex;justify-content:space-between;padding:8px 12px}.time-label{color:#495057;font-size:.9rem;font-weight:600;letter-spacing:.5px;text-transform:uppercase}.time-value{color:#2c3e50;font-family:Courier New,monospace;font-size:1.2rem;font-weight:700;letter-spacing:1px}.time-value.low-time{animation:timeWarning 1s ease-in-out infinite alternate;color:#dc3545}@keyframes timeWarning{0%{color:#dc3545}to{color:#ff6b6b}}.player-timings{background:#fff;border:1px solid #dee2e6;border-radius:10px;box-shadow:0 2px 4px #0000000d;margin-bottom:20px;padding:15px}.player-timings h3{border-bottom:2px solid #dee2e6;color:#2c3e50;font-size:1.3rem;margin:0 0 15px;padding-bottom:10px;text-align:center}.timings-grid{grid-gap:12px;display:grid;gap:12px;grid-template-columns:1fr 1fr}.player-timing-section{background:#f8f9fa;border:1px solid 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