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lastMoveGlow{0%,to{stroke:gold;stroke-width:6;filter:drop-shadow(0 0 10px rgba(255,215,0,1)) drop-shadow(0 0 20px rgba(255,215,0,.8)) drop-shadow(0 0 30px rgba(255,165,0,.6))}50%{stroke:orange;stroke-width:7;filter:drop-shadow(0 0 15px rgba(255,215,0,1)) drop-shadow(0 0 30px rgba(255,215,0,.9)) drop-shadow(0 0 45px rgba(255,165,0,.7))}}@keyframes pieceAppear{0%{transform:scale(0);opacity:0}50%{transform:scale(1.2)}to{transform:scale(1);opacity:1}}.position.hint-square{stroke:#2196f3!important;stroke-width:6!important;filter:drop-shadow(0 0 15px rgba(33,150,243,.8));animation:hintPulse 1.5s infinite}@keyframes hintPulse{0%,to{stroke-width:6;filter:drop-shadow(0 0 15px rgba(33,150,243,.8))}50%{stroke-width:8;filter:drop-shadow(0 0 25px rgba(33,150,243,1))}}.hint-button{background:#2196f34d;border-color:#2196f380}.position.selected{fill:gold!important;stroke:#ffab00;stroke-width:5;filter:drop-shadow(0 0 16px #ffd700) drop-shadow(0 0 8px #ffd700);animation:pulseSelected 1.5s ease-in-out infinite}.position[draggable=true]{cursor:grab!important}.position[draggable=true]:active{cursor:grabbing!important;opacity:.6}.position.removable{fill:#ff5252!important;stroke:#d32f2f;stroke-width:5;filter:drop-shadow(0 0 16px #ff5252) drop-shadow(0 0 8px #ff5252);animation:blinkRemovable 1.2s ease-in-out infinite}@keyframes pulseSelected{0%,to{opacity:1}50%{opacity:.7}}@keyframes blinkRemovable{0%,to{opacity:1}50%{opacity:.6}}.settings-panel{background:#ffffff14;padding:15px 20px;border-radius:16px;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 16px 48px #0006,inset 0 1px #ffffff26;max-width:700px;width:calc(100% - 20px);margin:10px auto;border:1px solid rgba(255,255,255,.15);transition:all .3s ease;box-sizing:border-box}.settings-panel:hover{box-shadow:0 20px 60px #00000080,inset 0 1px #fff3}.settings-panel h2{margin-top:0;margin-bottom:15px;font-size:1.8rem;text-align:center;color:#fff;text-shadow:0 0 20px 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#4caf5033}.language-select option,.theme-select option{background:#1a1a2e;color:#fff;padding:10px}.player-settings{display:flex;gap:12px;margin-bottom:15px;justify-content:center}.player-config{display:flex;flex-direction:column;gap:10px;background:#ffffff0d;padding:12px 16px;border-radius:12px;min-width:200px;border:1px solid rgba(255,255,255,.1);box-shadow:0 4px 16px #0003;transition:all .3s ease}.player-config:hover{transform:translateY(-3px);box-shadow:0 6px 24px #0000004d;border-color:#4caf504d}.player-config h3{margin:0 0 5px;font-size:1.2rem;text-align:center;color:#fff;font-weight:600}.player-type-select,.difficulty-select{padding:14px 18px;font-size:1.05rem;border-radius:12px;border:1px solid rgba(255,255,255,.2);background:#ffffff14;color:#fff;cursor:pointer;transition:all .3s ease;box-shadow:0 2px 8px #0003;font-weight:500}.player-type-select:hover,.difficulty-select:hover{background:#ffffff1f;border-color:#4caf5080;box-shadow:0 4px 12px #0000004d;transform:translateY(-2px)}.player-type-select:focus,.difficulty-select:focus{outline:none;border-color:#4caf50b3;box-shadow:0 0 0 3px #4caf5033}.player-type-select option,.difficulty-select option{background:#1a1a2e;color:#fff;padding:10px}.start-game-button{background:linear-gradient(135deg,#4caf50,#2e7d32);color:#fff;border:none;padding:20px 45px;font-size:1.4rem;font-weight:700;border-radius:16px;cursor:pointer;transition:all .3s ease;box-shadow:0 8px 24px #4caf5066,inset 0 1px #fff3;width:100%;border:1px solid rgba(255,255,255,.2);text-transform:uppercase;letter-spacing:1px}.start-game-button:hover{background:linear-gradient(135deg,#66bb6a,#4caf50);transform:translateY(-4px);box-shadow:0 12px 32px #4caf5080,inset 0 1px #ffffff4d}.start-game-button:active{transform:translateY(-2px);box-shadow:0 6px 16px #4caf5066,inset 0 1px #fff3}.online-mode-selection{background:#ffffff14;padding:30px;border-radius:24px;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 16px 48px #0006,inset 0 1px #ffffff26;max-width:700px;max-height:90vh;overflow-y:auto;margin:10px auto;border:1px solid rgba(255,255,255,.15);transition:all .3s ease}.online-mode-selection h2{margin-top:0;margin-bottom:25px;font-size:2rem;text-align:center;color:#fff;text-shadow:0 0 20px rgba(76,175,80,.4);font-weight:700}.online-error{background:#f4433633;border:2px solid rgba(244,67,54,.5);color:#fff;padding:15px 20px;border-radius:12px;margin-bottom:25px;text-align:center;font-weight:600;animation:errorShake .5s ease-in-out}@keyframes errorShake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.mode-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:25px}.mode-option{background:#ffffff14;border:2px solid 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rgba(244,67,54,.4);border-radius:8px;font-size:.85rem;font-weight:600;color:#fff}.user-level-badge{margin-top:10px;padding:6px 12px;background:#4caf5033;border:1px solid rgba(76,175,80,.4);border-radius:8px;font-size:.85rem;font-weight:700;color:#4caf50;text-shadow:0 0 10px rgba(76,175,80,.6)}.private-game-panel{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:35px;margin-bottom:25px;text-align:center}.private-game-panel h3{margin:0 0 25px;font-size:1.8rem;color:#fff;font-weight:600}.game-code-input{width:100%;max-width:300px;padding:16px 20px;font-size:1.8rem;text-align:center;border:2px solid rgba(255,255,255,.2);border-radius:12px;background:#ffffff14;color:#fff;font-weight:700;letter-spacing:4px;margin-bottom:20px;font-family:Courier New,monospace;box-shadow:0 4px 16px #0003;transition:all .3s ease}.game-code-input:focus{outline:none;border-color:#4caf50b3;box-shadow:0 0 0 4px #4caf5033}.game-code-input::placeholder{color:#ffffff4d;letter-spacing:2px}.create-game-button,.join-game-button{background:linear-gradient(135deg,#4caf50,#2e7d32);color:#fff;border:none;padding:16px 40px;font-size:1.2rem;font-weight:700;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 6px 20px #4caf5066;border:1px solid rgba(255,255,255,.2);text-transform:uppercase;letter-spacing:1px}.create-game-button:hover,.join-game-button:hover{background:linear-gradient(135deg,#66bb6a,#4caf50);transform:translateY(-3px);box-shadow:0 8px 28px #4caf5080}.create-game-button:active,.join-game-button:active{transform:translateY(-1px)}.private-game-waiting{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:40px;margin-bottom:25px;text-align:center}.private-game-waiting h3{margin:0 0 20px;font-size:1.5rem;color:#fff;font-weight:600}.game-code-display{background:#4caf5026;border:3px solid rgba(76,175,80,.5);border-radius:16px;padding:25px 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#607d8b80}.back-button:active{transform:translateY(-1px)}.game-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:10px}.undo-button,.settings-button,.reset-button{color:#fff;border:none;padding:.75rem 1.5rem;font-size:.95rem;font-weight:600;border-radius:10px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);min-width:120px;min-height:44px;border:1px solid rgba(255,255,255,.2);position:relative;overflow:hidden}.undo-button:before,.settings-button:before,.reset-button:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#fff3;transform:translate(-50%,-50%);transition:width .6s,height .6s}.undo-button:hover:before,.settings-button:hover:before,.reset-button:hover:before{width:300px;height:300px}.undo-button{background:linear-gradient(135deg,#2196f3,#1565c0);box-shadow:0 3px 12px 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#00000080;z-index:1000;animation:notificationSlideIn .5s ease-out,notificationPulse .5s ease-in-out .5s 2;text-align:center;border:3px solid rgba(255,255,255,.3)}@keyframes notificationSlideIn{0%{opacity:0;transform:translate(-50%,-60%)}to{opacity:1;transform:translate(-50%,-50%)}}@keyframes notificationPulse{0%,to{transform:translate(-50%,-50%) scale(1)}50%{transform:translate(-50%,-50%) scale(1.05)}}@media(max-width:768px){.opponent-found-notification{font-size:1.5rem;padding:25px 40px}}@media(max-width:480px){.opponent-found-notification{font-size:1.3rem;padding:20px 30px}}.help-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000d9;display:flex;align-items:center;justify-content:center;z-index:2000;animation:fadeIn .3s ease-out;padding:1rem}.help-modal-content{background:var(--bg-card);border:3px solid var(--accent-primary);border-radius:16px;padding:2rem;max-width:700px;max-height:85vh;overflow-y:auto;box-shadow:0 10px 40px #00000080;animation:slideUp .4s ease-out;position:relative}.help-close-button{position:absolute;top:1rem;right:1rem;width:36px;height:36px;background:var(--bg-input);color:var(--text-primary);border:2px solid var(--border-primary);border-radius:50%;font-size:1.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease;line-height:1;padding:0}.help-close-button:hover{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary);transform:rotate(90deg)}.help-title{color:var(--text-primary);font-size:2rem;margin-bottom:1.5rem;padding-right:2rem;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.help-body{color:var(--text-primary);margin-bottom:1.5rem}.help-section{margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border-primary)}.help-section:last-child{border-bottom:none}.help-section h3{color:var(--accent-primary);font-size:1.4rem;margin-bottom:.75rem;font-weight:600}.help-section p{color:var(--text-secondary);line-height:1.6;margin:.5rem 0}.help-section ul{list-style:none;padding-left:0;margin:.5rem 0}.help-section ul li{color:var(--text-secondary);line-height:1.8;padding:.5rem 0 .5rem 1.5rem;position:relative}.help-section ul li:before{content:"▸";position:absolute;left:0;color:var(--accent-primary);font-weight:700}.help-close-footer-button{width:100%;padding:1rem;background:var(--accent-primary);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 8px #0003}.help-close-footer-button:hover{transform:translateY(-2px);box-shadow:0 6px 12px #0000004d}.help-close-footer-button:active{transform:translateY(0)}.help-modal-content::-webkit-scrollbar{width:10px}.help-modal-content::-webkit-scrollbar-track{background:var(--bg-input);border-radius:10px}.help-modal-content::-webkit-scrollbar-thumb{background:var(--accent-primary);border-radius:10px}.help-modal-content::-webkit-scrollbar-thumb:hover{background:var(--accent-secondary)}@keyframes slideUp{0%{transform:translateY(50px);opacity:0}to{transform:translateY(0);opacity:1}}@media(max-width:768px){.help-modal-content{padding:1.5rem;max-height:90vh}.help-title{font-size:1.5rem}.help-section h3{font-size:1.2rem}.help-close-button{width:32px;height:32px;font-size:1.2rem}}.connectfour-game{min-height:100vh;max-height:100vh;background:var(--bg-primary);padding:.5rem;padding-top:max(.5rem,env(safe-area-inset-top,.5rem));display:flex;flex-direction:column;align-items:center;color:var(--text-primary);overflow-y:auto;overflow-x:hidden;box-sizing:border-box}@media(min-width:768px){.connectfour-game{padding:2rem}}.back-to-hub-button{padding:.4rem .8rem;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:8px;color:var(--text-primary);font-size:.75rem;font-weight:600;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);order:-1;position:absolute;left:0;z-index:101}@media(min-width:768px){.back-to-hub-button{padding:.7rem 1.5rem;font-size:1rem;border-radius:10px;position:static}}.header-actions{min-width:80px;display:flex;justify-content:flex-end;position:absolute;right:0;z-index:101}@media(min-width:768px){.header-actions{min-width:150px;position:static}}.user-profile-header{display:flex;align-items:center;gap:1rem;padding:.5rem 1rem;background:var(--bg-card);border-radius:10px;border:2px solid var(--border-primary);cursor:pointer;transition:all .3s 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rgba(33,150,243,.5);min-height:44px}.reset-button{background:var(--btn-secondary-bg);color:#fff}@media(max-width:768px){.connectfour-game{padding:.5rem;min-height:100vh;display:flex;flex-direction:column;overflow:hidden}.back-to-hub-button{padding:.5rem 1rem;font-size:.85rem}.settings-panel{padding:1rem;max-height:90vh;overflow-y:auto}.settings-section{flex-direction:column;gap:1rem}.player-settings{grid-template-columns:1fr;gap:1rem}.game-status{font-size:.9rem;min-width:auto;width:100%;padding:.5rem 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35%,#666,#333,#000)}.checkers-piece:hover{transform:scale(1.05)}.checkers-piece.king{border:3px solid #ffd700;box-shadow:0 0 20px #ffd70099}.king-crown{font-size:2rem;color:gold;text-shadow:0 2px 4px rgba(0,0,0,.5);filter:drop-shadow(0 0 8px rgba(255,215,0,.8))}.undo-button,.hint-button,.settings-button{padding:.8rem 1.5rem;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;border:none}.undo-button,.settings-button{background:var(--bg-card);color:var(--text-primary);border:2px solid var(--border-primary)}.undo-button:hover:not(:disabled),.settings-button:hover{border-color:var(--accent-primary);background:var(--bg-card-hover)}.hint-button{background:#2196f34d;color:var(--text-primary);border:2px solid rgba(33,150,243,.5)}.hint-button:hover:not(:disabled){background:#2196f380;border-color:#2196f3b3;box-shadow:0 6px 20px 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rgba(255,215,0,.5)}.back-button{background:#ffffff1a;border:2px solid rgba(255,255,255,.3);color:#fff;padding:10px 20px;border-radius:10px;cursor:pointer;font-size:1rem;transition:all .3s ease}.back-button:hover{background:#fff3;transform:translateY(-2px)}.chess-game-area{display:flex;flex-direction:column;align-items:center;gap:20px;max-width:1200px;width:100%}.game-status{background:#ffffff1a;border:2px solid rgba(255,255,255,.3);border-radius:15px;padding:15px 30px;font-size:1.3rem;font-weight:600;text-align:center;min-width:300px;box-shadow:0 4px 15px #0003}.game-status.check{background:#ff45004d;border-color:#ff450080;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.check-indicator{color:#f44;font-weight:700}.last-move-text{font-size:.9rem;margin-top:8px;color:#fffc;font-weight:400}.chess-board-container{display:flex;flex-direction:column;gap:10px}.chess-board-wrapper{display:flex;gap:10px}.chess-board{display:grid;grid-template-columns:repeat(8,70px);grid-template-rows:repeat(8,70px);border:4px solid #8B4513;box-shadow:0 10px 40px #00000080;border-radius:8px;overflow:hidden}.chess-files{display:grid;grid-template-columns:repeat(8,70px);gap:0;padding-left:40px}.file-label{text-align:center;font-weight:600;font-size:.9rem;color:#fffc}.chess-ranks{display:grid;grid-template-rows:repeat(8,70px);gap:0;padding-right:10px}.rank-label{display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;color:#fffc}.chess-square{width:70px;height:70px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;transition:all .2s ease}.chess-square.light{background:#f0d9b5}.chess-square.dark{background:#b58863}.chess-square:hover{filter:brightness(1.1)}.chess-square.selected{background:#baca44!important;box-shadow:inset 0 0 10px #0000004d}.chess-square.legal-move{background:#14551e80!important}.chess-square.last-move{background:#ffff004d!important}.chess-square.hint-square{background:#0096ff66!important;box-shadow:inset 0 0 15px #0096ff99;animation:hint-pulse 1.5s infinite}@keyframes hint-pulse{0%,to{box-shadow:inset 0 0 15px #0096ff99}50%{box-shadow:inset 0 0 25px #0096ffe6}}.hint-indicator{position:absolute;width:30px;height:30px;border:3px solid rgba(0,150,255,.8);border-radius:50%;pointer-events:none;animation:hint-rotate 2s linear infinite}@keyframes hint-rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.chess-piece{font-size:50px;-webkit-user-select:none;user-select:none;transition:transform .2s ease;filter:drop-shadow(2px 2px 4px rgba(0,0,0,.3))}.chess-piece.white{color:#fff;text-shadow:-1px -1px 0 #000,1px -1px 0 #000,-1px 1px 0 #000,1px 1px 0 #000,0 0 5px rgba(255,255,255,.5)}.chess-piece.black{color:#000;text-shadow:-1px -1px 0 #ffffff,1px -1px 0 #ffffff,-1px 1px 0 #ffffff,1px 1px 0 #ffffff,0 0 3px rgba(0,0,0,.8)}.chess-square:hover .chess-piece{transform:scale(1.1)}.move-dot{width:20px;height:20px;background:#0000004d;border-radius:50%}.capture-ring{position:absolute;width:60px;height:60px;border:4px solid rgba(255,0,0,.5);border-radius:50%;pointer-events:none}.captured-pieces{background:#ffffff1a;border:2px solid rgba(255,255,255,.2);border-radius:10px;padding:10px 20px;min-height:60px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;max-width:600px}.captured-piece{font-size:30px;opacity:.7;filter:grayscale(.5)}.move-history{background:#ffffff1a;border:2px solid rgba(255,255,255,.2);border-radius:15px;padding:20px;width:100%;max-width:600px;max-height:200px}.move-history h3{margin-top:0;margin-bottom:15px;font-size:1.2rem;color:#ffffffe6}.move-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;max-height:120px;overflow-y:auto;font-family:Courier New,monospace}.move-item{background:#ffffff0d;padding:5px 10px;border-radius:5px;font-size:.9rem}.game-controls{display:flex;gap:15px;margin-top:10px}.control-button{background:#4caf504d;border:2px solid rgba(76,175,80,.5);color:#fff;padding:12px 30px;border-radius:12px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease}.control-button:hover:not(:disabled){background:#4caf5080;transform:translateY(-2px);box-shadow:0 6px 20px #4caf504d}.control-button:disabled{opacity:.4;cursor:not-allowed;background:#64646433;border-color:#6464644d}.undo-button:not(:disabled){background:#ff98004d;border-color:#ff980080}.undo-button:hover:not(:disabled){background:#ff980080;box-shadow:0 6px 20px #ff98004d}.hint-button:not(:disabled){background:#2196f34d;border-color:#2196f380}.hint-button:hover:not(:disabled){background:#2196f380;box-shadow:0 6px 20px #2196f34d}.settings-panel{background:#ffffff14;padding:30px;border-radius:24px;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 16px 48px #0006,inset 0 1px #ffffff26;max-width:700px;width:calc(100% - 40px);margin:20px auto;border:1px solid rgba(255,255,255,.15);box-sizing:border-box}.settings-panel h2{margin-top:0;margin-bottom:30px;font-size:2rem;text-align:center;color:#fff;text-shadow:0 0 20px rgba(255,215,0,.4)}.settings-section{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-bottom:30px}.setting-group{display:flex;flex-direction:column;gap:8px}.setting-group label{font-weight:600;color:#ffffffe6}.setting-group select{padding:12px;border-radius:8px;border:2px solid rgba(255,255,255,.2);background:#ffffff1a;color:#fff;font-size:1rem;cursor:pointer;transition:all .3s ease}.setting-group select:hover{border-color:#ffd70080}.setting-group select option{background:#2a5298;color:#fff}.player-settings{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-bottom:30px}.player-config{background:#ffffff0d;padding:20px;border-radius:15px;border:2px solid rgba(255,255,255,.1)}.player-config h3{margin-top:0;margin-bottom:15px;font-size:1.3rem;color:#fffffff2}.player-config select{width:100%;padding:12px;margin-bottom:10px;border-radius:8px;border:2px solid rgba(255,255,255,.2);background:#ffffff1a;color:#fff;font-size:1rem;cursor:pointer}.player-config select option{background:#2a5298}.start-game-button{width:100%;padding:18px;background:linear-gradient(135deg,#4caf50,#45a049);border:none;border-radius:15px;color:#fff;font-size:1.3rem;font-weight:700;cursor:pointer;box-shadow:0 6px 20px #4caf5066;transition:all .3s ease;text-transform:uppercase;letter-spacing:1px}.start-game-button:hover{transform:translateY(-3px);box-shadow:0 8px 25px #4caf5080}.start-game-button:active{transform:translateY(-1px)}@media(max-width:768px){.chess-board{grid-template-columns:repeat(8,50px);grid-template-rows:repeat(8,50px)}.chess-square{width:50px;height:50px}.chess-piece{font-size:35px}.chess-files{grid-template-columns:repeat(8,50px)}.chess-ranks{grid-template-rows:repeat(8,50px)}.file-label,.rank-label{font-size:.8rem}.game-title{font-size:2rem}.settings-panel{padding:25px}.move-history{max-height:150px}}.theme-light .chess-square.light{background:#f0f0f0}.theme-light .chess-square.dark{background:#ccc}.theme-dark .chess-square.light{background:#404040}.theme-dark .chess-square.dark{background:#262626}.promotion-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000c;display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .3s ease-out}.promotion-dialog{background:var(--bg-modal);padding:2.5rem;border-radius:20px;text-align:center;border:3px solid var(--border-primary);box-shadow:0 20px 60px #00000080;animation:scaleIn .4s ease-out}.promotion-dialog h3{font-size:1.8rem;margin-bottom:1rem;color:var(--text-primary)}.promotion-dialog p{font-size:1rem;color:var(--text-secondary);margin-bottom:1.5rem}.promotion-pieces{display:flex;gap:1rem;justify-content:center}.promotion-piece{background:var(--bg-card);border:3px solid var(--border-primary);border-radius:15px;padding:1.5rem 1rem;cursor:pointer;transition:all .3s ease;display:flex;flex-direction:column;align-items:center;gap:.5rem;min-width:80px}.promotion-piece:hover{border-color:var(--accent-primary);background:var(--bg-card-hover);transform:translateY(-5px);box-shadow:var(--shadow-accent)}.promotion-piece:active{transform:translateY(-2px)}.promotion-piece:first-child{font-size:3.5rem}.promotion-piece span{font-size:.9rem;color:var(--text-secondary);font-weight:600}@media(max-width:768px){.promotion-dialog{padding:2rem;margin:1rem}.promotion-pieces{flex-wrap:wrap}.promotion-piece{min-width:70px;padding:1rem .8rem}.promotion-piece:first-child{font-size:3rem}}.reversi-game{min-height:100vh;background:var(--bg-primary);padding:1rem 2rem 2rem;display:flex;flex-direction:column;align-items:center;justify-content:flex-start}.reversi-settings{width:100%;max-width:500px;text-align:center}.reversi-settings h2{color:var(--text-primary);font-size:2.5rem;margin-bottom:2rem;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.settings-panel{background:var(--bg-card);border:2px solid var(--border-primary);border-radius:12px;padding:2rem;box-shadow:var(--shadow-md)}.settings-panel h3{color:var(--text-primary);margin-bottom:1.5rem;font-size:1.5rem}.setting-group{margin-bottom:1.5rem;text-align:left}.setting-group label{display:block;color:var(--text-primary);font-weight:600;margin-bottom:.5rem}.setting-group select{width:100%;padding:.75rem;background:var(--bg-primary);color:var(--text-primary);border:2px solid var(--border-primary);border-radius:8px;font-size:1rem;cursor:pointer;transition:all .3s ease}.setting-group select:hover{border-color:var(--accent-primary)}.setting-group select:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px #4caf5033}.start-button,.back-button{width:100%;padding:1rem;margin-top:1rem;background:var(--accent-primary);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #0003}.start-button:hover{transform:translateY(-2px);box-shadow:0 6px 12px #0000004d}.start-button:active{transform:translateY(0)}.back-button{background:var(--bg-primary);border:2px solid var(--border-primary);color:var(--text-primary)}.reversi-main{width:100%;max-width:800px}.game-header{text-align:center;margin-bottom:2rem}.game-header h2{color:var(--text-primary);font-size:2rem;margin-bottom:1rem;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.game-info{display:flex;justify-content:center;gap:3rem;margin-top:1rem}.player-info{display:flex;align-items:center;gap:.75rem;padding:.75rem 1.5rem;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:12px;transition:all .3s ease;opacity:.6}.player-info.active{opacity:1;border-color:var(--accent-primary);box-shadow:0 0 15px #4caf5066;transform:scale(1.05)}.player-info span{color:var(--text-primary);font-weight:700;font-size:1.1rem}.player-piece{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px #0000004d}.player-piece.black{background:radial-gradient(circle at 35% 35%,#555,#1a1a1a)}.player-piece.white{background:radial-gradient(circle at 35% 35%,#fff,#d0d0d0)}.reversi-board{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;max-width:600px;aspect-ratio:1;margin:0 auto 2rem;padding:1rem;background:linear-gradient(145deg,#1a7a2a,#2a9a3a);border-radius:12px;box-shadow:var(--shadow-md),inset 0 2px 10px #0000004d}.reversi-square{aspect-ratio:1;background:linear-gradient(145deg,#228b22,#2a9d2a);cursor:pointer;transition:all .2s ease;border-radius:6px;display:flex;align-items:center;justify-content:center;position:relative;box-shadow:inset 0 1px 3px #0003}.reversi-square:hover{background:linear-gradient(145deg,#2a9d2a,#32ad32)}.reversi-square.last-move{box-shadow:inset 0 0 0 3px var(--accent-primary),0 0 15px #4caf5099;animation:pulse 1s ease-in-out}@keyframes pulse{0%,to{box-shadow:inset 0 0 0 3px var(--accent-primary),0 0 15px #4caf5099}50%{box-shadow:inset 0 0 0 3px var(--accent-primary),0 0 25px #4caf50e6}}.reversi-square.legal{background:linear-gradient(145deg,#3ab33a,#4ac44a);cursor:pointer}.reversi-square.hint{background:linear-gradient(145deg,gold,#ffed4e);box-shadow:0 0 20px #ffd700b3;animation:hint-glow 1s ease-in-out infinite}@keyframes hint-glow{0%,to{box-shadow:0 0 20px #ffd700b3}50%{box-shadow:0 0 30px gold}}.legal-indicator{width:30%;height:30%;background:#ffffff80;border-radius:50%;box-shadow:0 0 10px #fff9;animation:indicator-pulse 1.5s ease-in-out infinite}@keyframes indicator-pulse{0%,to{transform:scale(1);opacity:.6}50%{transform:scale(1.3);opacity:1}}.reversi-piece{width:85%;height:85%;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s ease;animation:piece-flip .4s ease-in-out;box-shadow:0 3px 8px #0006}@keyframes piece-flip{0%{transform:rotateY(0) scale(.5)}50%{transform:rotateY(90deg) scale(.7)}to{transform:rotateY(180deg) scale(1)}}.reversi-piece.placed{animation:piece-place .4s ease-out}@keyframes piece-place{0%{transform:scale(0)}60%{transform:scale(1.15)}to{transform:scale(1)}}.reversi-piece.black{background:radial-gradient(circle at 35% 35%,#555,#1a1a1a);border:2px solid #0a0a0a}.reversi-piece.white{background:radial-gradient(circle at 35% 35%,#fff,#d0d0d0);border:2px solid #b0b0b0}.piece-inner{width:60%;height:60%;border-radius:50%;background:#ffffff1a;box-shadow:inset 0 2px 6px #fff3}.game-controls{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap;margin-top:2rem}.game-controls button{padding:.75rem 1.5rem;background:var(--accent-primary);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 3px 6px #0003}.game-controls button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 10px #0000004d}.game-controls button:active:not(:disabled){transform:translateY(0)}.game-controls button:disabled{opacity:.4;cursor:not-allowed}.game-over-overlay{position:relative;width:100%;max-width:800px;margin:0 auto 2rem;display:flex;align-items:center;justify-content:center;z-index:100;animation:fade-in .3s ease-out}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.game-over-panel{background:var(--bg-card);border:3px solid var(--accent-primary);border-radius:16px;padding:3rem;text-align:center;max-width:500px;box-shadow:0 10px 40px #00000080;animation:slide-up .4s ease-out}@keyframes slide-up{0%{transform:translateY(50px);opacity:0}to{transform:translateY(0);opacity:1}}.game-over-panel h2{color:var(--text-primary);font-size:2.5rem;margin-bottom:1rem;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.game-over-panel p{color:var(--text-primary);font-size:1.5rem;margin-bottom:2rem}.game-over-buttons{display:flex;flex-direction:column;gap:1rem}.game-over-buttons button{width:100%;padding:1rem;background:var(--accent-primary);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 8px #0003}.game-over-buttons button:hover{transform:translateY(-2px);box-shadow:0 6px 12px #0000004d}@media(max-width:768px){.reversi-game{padding:.5rem;padding-top:max(.5rem,env(safe-area-inset-top,.5rem))}.reversi-board{gap:2px;padding:.5rem}.game-info{gap:1.5rem;flex-direction:column;align-items:center}.game-controls{flex-direction:column;width:100%}.game-controls button{width:100%}.game-over-panel{margin:1rem;padding:2rem}.game-over-panel h2{font-size:2rem}}.tictactoe-game{min-height:100vh;background:var(--bg-primary);padding:2rem;display:flex;flex-direction:column;align-items:center;color:var(--text-primary)}.game-header{width:100%;max-width:1200px;display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.game-header h1{font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;flex:1;text-align:center}.back-to-hub-button,.help-button{padding:.75rem 1.5rem;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:10px;color:var(--text-primary);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);min-height:44px}.back-to-hub-button:hover,.help-button:hover{background:var(--bg-card-hover);border-color:var(--accent-primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.settings-panel{background:var(--bg-card);border-radius:24px;padding:30px;max-width:700px;width:calc(100% - 40px);margin:20px auto;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:2px solid var(--border-primary);box-shadow:var(--shadow-lg);animation:fadeIn .5s ease-out}.settings-panel h2{font-size:2rem;margin-bottom:2rem;text-align:center;color:var(--text-primary)}.settings-section{display:flex;gap:2rem;margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px solid var(--border-primary)}.language-selector,.theme-selector{flex:1;display:flex;flex-direction:column;gap:.5rem}.language-selector label,.theme-selector label{font-weight:600;color:var(--text-primary);font-size:.95rem}.language-select,.theme-select{padding:.7rem 1rem;background:var(--bg-input);border:2px solid var(--border-primary);border-radius:10px;color:var(--text-primary);font-size:.95rem;cursor:pointer;transition:all .3s ease}.language-select:hover,.theme-select:hover{border-color:var(--accent-primary)}.language-select:focus,.theme-select:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 3px #4caf501a}.player-settings{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-bottom:2rem}.player-config{background:var(--bg-input);padding:1.5rem;border-radius:12px;border:1px solid var(--border-primary)}.player-config h3{font-size:1.1rem;margin-bottom:1rem;color:var(--text-primary)}.player-type-select,.difficulty-select{width:100%;padding:.7rem 1rem;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:8px;color:var(--text-primary);font-size:.95rem;cursor:pointer;margin-bottom:.8rem;transition:all .3s ease}.player-type-select:hover,.difficulty-select:hover{border-color:var(--accent-primary)}.player-type-select:focus,.difficulty-select:focus{outline:none;border-color:var(--border-focus)}.start-game-button{width:100%;padding:1rem 2rem;background:var(--btn-primary-bg);border:none;border-radius:12px;color:#fff;font-size:1.2rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:var(--shadow-md);text-transform:uppercase;letter-spacing:1px}.start-game-button:hover{background:var(--btn-primary-hover);box-shadow:var(--shadow-accent);transform:translateY(-2px)}.start-game-button:active{transform:translateY(0)}.game-status{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:1.5rem;text-align:center;padding:1rem 2rem;background:var(--bg-card);border-radius:12px;border:2px solid var(--border-primary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);min-width:400px}.game-result-overlay{position:relative;width:100%;max-width:800px;margin:0 auto 2rem;display:flex;justify-content:center;align-items:center;z-index:100;animation:fadeIn .3s ease-out}.game-result-card{background:var(--bg-modal);padding:3rem;border-radius:25px;text-align:center;max-width:500px;border:3px solid var(--border-primary);box-shadow:var(--shadow-lg);animation:scaleIn .4s ease-out}@keyframes scaleIn{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}.result-icon{font-size:5rem;margin-bottom:1rem}.result-title{font-size:2.5rem;font-weight:700;margin-bottom:.5rem}.result-subtitle{font-size:1.2rem;color:var(--text-secondary);margin-bottom:2rem}.win-title{color:var(--status-success)}.lose-title{color:var(--status-error)}.neutral-title{color:var(--accent-primary)}.result-actions{display:flex;gap:1rem;justify-content:center}.new-game-button-large,.settings-button-large{padding:1rem 2rem;border-radius:12px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s ease;border:none}.new-game-button-large{background:var(--btn-primary-bg);color:#fff}.new-game-button-large:hover{background:var(--btn-primary-hover);box-shadow:var(--shadow-md)}.settings-button-large{background:var(--bg-input);color:var(--text-primary);border:2px solid var(--border-primary)}.settings-button-large:hover{border-color:var(--accent-primary);background:var(--bg-card-hover)}.board-container{margin-bottom:2rem;display:flex;justify-content:center;align-items:center}.tictactoe-board{display:grid;grid-template-columns:repeat(3,150px);grid-template-rows:repeat(3,150px);gap:10px;background:var(--accent-secondary);padding:10px;border-radius:20px;box-shadow:var(--shadow-lg);place-items:center}.cell{background:var(--bg-card);border-radius:15px;cursor:pointer;transition:all .3s ease;display:flex;justify-content:center;align-items:center;position:relative;border:3px solid var(--border-primary);font-size:4rem;font-weight:700;-webkit-user-select:none;user-select:none;width:100%;height:100%}.cell:hover{background:var(--bg-card-hover);border-color:var(--accent-primary);transform:scale(1.05)}.cell.winning{animation:winningPulse 1s ease-in-out infinite;border-color:var(--status-success);background:#4caf5033}@keyframes winningPulse{0%,to{box-shadow:0 0 20px var(--status-success)}50%{box-shadow:0 0 40px var(--status-success)}}.symbol{animation:symbolAppear .3s ease-out;display:flex;justify-content:center;align-items:center;width:100%;height:100%}.symbol-x{color:#4caf50;text-shadow:2px 2px 6px rgba(0,0,0,.5)}.symbol-o{color:#ff9800;text-shadow:2px 2px 6px rgba(0,0,0,.5)}@keyframes symbolAppear{0%{transform:scale(0) rotate(-180deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}.game-actions{display:flex;gap:1rem;justify-content:center}.undo-button,.reset-button,.settings-button{padding:.75rem 1.5rem;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;border:none;min-height:44px}.undo-button{background:var(--bg-card);color:var(--text-primary);border:2px solid var(--border-primary);box-sizing:border-box}.undo-button:hover:not(:disabled){border-color:var(--accent-primary);background:var(--bg-card-hover)}.undo-button:disabled{opacity:.5;cursor:not-allowed}.reset-button{background:var(--btn-secondary-bg);color:#fff;border:2px solid transparent;box-sizing:border-box}.reset-button:hover{background:var(--btn-primary-hover);box-shadow:var(--shadow-md)}.settings-button{background:var(--bg-card);color:var(--text-primary);border:2px solid var(--border-primary);box-sizing:border-box}.settings-button:hover{border-color:var(--accent-primary);background:var(--bg-card-hover)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@media(max-width:768px){.tictactoe-game{padding:1rem}.game-header h1{font-size:1.8rem}.settings-panel{padding:1.5rem}.settings-section{flex-direction:column}.player-settings{grid-template-columns:1fr}.tictactoe-board{grid-template-columns:repeat(3,100px);grid-template-rows:repeat(3,100px);gap:8px}.cell{font-size:2.5rem}.game-status{font-size:1.1rem;min-width:auto;width:100%}.game-result-card{padding:2rem;margin:1rem}.result-icon{font-size:3.5rem}.result-title{font-size:1.8rem}.result-actions{flex-direction:column}.new-game-button-large,.settings-button-large{width:100%}.game-actions{flex-direction:column;width:100%}.undo-button,.reset-button,.settings-button{width:100%}}#root{max-width:1280px;margin:0 auto;padding:.5rem;text-align:center;width:100%;height:100vh;max-height:100vh;overflow-y:auto;overflow-x:hidden}@media(min-width:768px){#root{padding:2rem}}.logo{height:6em;padding:1.5em;will-change:filter;transition:filter .3s}.logo:hover{filter:drop-shadow(0 0 2em #646cffaa)}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media(prefers-reduced-motion:no-preference){a:nth-of-type(2) .logo{animation:logo-spin infinite 20s linear}}.card{padding:2em}.read-the-docs{color:#888}