*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #ffc107;--primary-dark: #e0a800;--secondary: #6c757d;--background: #f8f9fa;--text: #212529;--winner-bg: #28a745;--draw-bg: #17a2b8;font-family:Poppins,sans-serif;color:var(--text)}body{background-color:var(--background);min-height:100vh;padding:20px}button{cursor:pointer;border:none;border-radius:5px;font-weight:700;transition:background-color .2s,transform .1s}button:hover{transform:translateY(-2px)}button:active{transform:translateY(0)}@media (max-width: 480px){body{padding:10px}}:root{--yellow: #ffc107;--winner-color: #28a745;--draw-color: #17a2b8}.light-theme{--bg-color: #f8f9fa;--text-color: #212529;--card-color: var(--yellow);--card-hover: #ffcd39}.dark-theme{--bg-color: #212529;--text-color: #f8f9fa;--card-color: #5c636a;--card-hover: #6c757d}body{transition:background-color .3s ease}body.dark-theme{background-color:#212529}.app-container{max-width:600px;margin:0 auto;text-align:center;padding:20px;font-family:Poppins,sans-serif;background-color:var(--bg-color);color:var(--text-color);border-radius:15px;box-shadow:0 0 20px #0000001a;transition:all .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid var(--yellow);animation:fadeIn .8s ease}.game-header h1{font-size:2.5rem;color:var(--text-color);margin:0;font-weight:700}.theme-toggle{background:none;font-size:1.5rem;padding:8px;border-radius:50%;transition:transform .3s;background-color:var(--card-color);height:40px;width:40px;display:flex;align-items:center;justify-content:center}.theme-toggle:hover{transform:rotate(30deg)}.game-over{margin:20px 0;padding:15px;border-radius:10px;animation:bounceIn .6s;transition:all .3s ease}.game-over.winner{background-color:var(--winner-color);color:#fff}.game-over.draw{background-color:var(--draw-color);color:#fff}@keyframes bounceIn{0%{transform:scale(.5);opacity:0}60%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.game-info{margin:20px 0;animation:fadeIn .5s ease}.game-info h2{font-size:1.5rem}.player-x{color:#dc3545;font-weight:700}.player-o{color:#007bff;font-weight:700}.vs-computer-indicator{background-color:#007bff1a;border-radius:8px;padding:5px 10px;margin-top:5px;font-size:.9rem;animation:fadeIn .5s}.game-mode-info{background-color:#007bff1a;color:#007bff;padding:10px 15px;border-radius:10px;margin:10px 0 15px;font-weight:500;animation:fadeIn .5s;box-shadow:0 2px 5px #0000001a}.notification-message{background-color:#28a745;color:#fff;padding:12px 20px;border-radius:8px;margin:10px 0;position:relative;font-weight:500;box-shadow:0 4px 12px #0003;animation:notificationAppear .5s ease-out;z-index:100}@keyframes 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infinite;transform:scale(1.05)}.card.game-over{opacity:.6;cursor:default}.card.thinking{background-color:#007bff1a;cursor:not-allowed;position:relative}.thinking-container{position:absolute;display:flex;justify-content:center;align-items:center;gap:6px}.thinking-indicator{width:10px;height:10px;border-radius:50%;background-color:#007bffb3;animation:pulse 1s infinite alternate}.thinking-indicator.delay-1{animation-delay:.3s}.thinking-indicator.delay-2{animation-delay:.6s}.card-x{color:#dc3545}.card-o{color:#007bff}.card-content{display:flex;justify-content:center;align-items:center;width:100%;height:100%;font-size:2rem}.card svg{width:70%;height:70%;transition:all .3s ease}.card-x svg{animation:enterX .4s ease-out}.card-o svg{animation:enterO .4s ease-out}@keyframes pulse{0%{transform:scale(.5);opacity:.3}to{transform:scale(1);opacity:1}}@keyframes enterX{0%{transform:scale(0) rotate(180deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}@keyframes enterO{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}@media (max-width: 480px){.card-content{font-size:1.5rem}}@media (max-width: 320px){.card-content{font-size:1.2rem}}.grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;max-width:400px;margin:0 auto;animation:fadeIn .8s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 480px){.grid{grid-gap:5px;max-width:300px}}@media (max-width: 320px){.grid{grid-gap:3px;max-width:250px}}.scoreboard{display:flex;justify-content:space-around;margin:20px auto;border-radius:12px;overflow:hidden;max-width:400px;box-shadow:0 4px 10px #0000001a}.score-item{display:flex;flex-direction:column;padding:15px 0;flex:1;background-color:#f8f9fa;transition:transform .3s}.score-item:hover{transform:translateY(-3px)}.player-x{background-color:#dc35451a;color:#dc3545}.player-draw{background-color:#17a2b81a;color:#17a2b8}.player-o{background-color:#007bff1a;color:#007bff}.player-label{font-weight:700;margin-bottom:5px;font-size:1.2rem}.score-value{font-size:1.8rem;font-weight:700}@media (max-width: 480px){.player-label{font-size:1rem}.score-value{font-size:1.5rem}}.game-controls{display:flex;justify-content:center;gap:15px;margin:25px 0;flex-wrap:wrap}.btn{padding:12px 20px;border-radius:8px;font-size:1rem;font-weight:600;transition:all .3s ease;min-width:140px}.btn.primary{background-color:var(--yellow);color:#212529}.btn.primary:hover{background-color:var(--primary-dark)}.btn.secondary{background-color:#6c757d;color:#fff}.btn.secondary:hover{background-color:#5c636a}.btn.reset-scores{background-color:#dc3545;color:#fff}.btn.reset-scores:hover{background-color:#c82333}.btn.hint-btn{background-color:#17a2b8;color:#fff}.btn.hint-btn:hover{background-color:#138496}@media (max-width: 480px){.game-controls{gap:10px}.btn{padding:10px 15px;font-size:.9rem;min-width:120px}}.game-history{margin-top:30px;border-top:1px solid rgba(0,0,0,.1);padding-top:20px}.history-toggle{background-color:#17a2b8;color:#fff;padding:10px 15px;border-radius:5px;font-size:.9rem;margin-bottom:15px}.history-toggle:hover{background-color:#138496}.history-content{background-color:#00000008;border-radius:8px;padding:15px;max-height:200px;overflow-y:auto;animation:slideDown .3s ease}.history-content h3{margin-bottom:10px;border-bottom:1px solid 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ease;min-width:130px;border-radius:8px}.mode-button.active{background-color:var(--yellow);font-weight:700;box-shadow:0 2px 5px #0000001a;transform:translateY(-2px)}.difficulty-selector{position:relative;width:100%;max-width:250px;z-index:10}.difficulty-toggle{width:100%;padding:12px 20px;background-color:#ffffff1a;border:1px solid rgba(0,0,0,.1);border-radius:8px;text-align:left;font-size:.95rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:all .3s ease}.difficulty-toggle:hover{background-color:#ffffff26;transform:translateY(-2px)}.difficulty-options{position:absolute;top:110%;left:0;width:100%;background-color:#fff;border:1px solid rgba(0,0,0,.1);border-radius:8px;box-shadow:0 8px 16px #00000026;overflow:hidden;animation:slideDown .3s ease}.difficulty-option{width:100%;padding:12px 20px;text-align:left;background:none;border:none;border-bottom:1px solid rgba(0,0,0,.05);cursor:pointer;transition:all .2s ease;display:flex;justify-content:space-between;align-items:center}.difficulty-option:last-child{border-bottom:none}.difficulty-option:hover,.difficulty-option.active{background-color:#0000000d}.difficulty-option.active:before{content:"✓";position:absolute;right:12px;color:#28a745}.difficulty-option.clicked{animation:buttonPulse .5s}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes buttonPulse{0%{transform:scale(1)}50%{transform:scale(1.05);background-color:#28a74533}to{transform:scale(1)}}.difficulty-indicator{cursor:pointer}@media (max-width: 480px){.mode-button{padding:10px 15px;font-size:.85rem;min-width:110px}}